CORIXA CORP
S-1/A, 1997-09-26
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>   1
 
   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON SEPTEMBER 26, 1997
    
 
                                                      REGISTRATION NO. 333-32147
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
   
                                AMENDMENT NO. 3
    
                                       TO
 
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                               CORIXA CORPORATION
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                             <C>                             <C>
            DELAWARE                          2836                         91-1654387
(STATE OR OTHER JURISDICTION OF   (PRIMARY STANDARD INDUSTRIAL          (I.R.S. EMPLOYER
 INCORPORATION OR ORGANIZATION)   CLASSIFICATION CODE NUMBER)        IDENTIFICATION NUMBER)
</TABLE>
 
                        1124 COLUMBIA STREET, SUITE 200
                               SEATTLE, WA 98104
                                 (206) 667-5711
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
 
                              STEVEN GILLIS, PH.D.
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                               CORIXA CORPORATION
                        1124 COLUMBIA STREET, SUITE 200
                               SEATTLE, WA 98104
                                 (206) 667-5711
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                            ------------------------
 
                                   COPIES TO:
 
<TABLE>
<S>                                             <C>
            WILLIAM W. ERICSON, ESQ.                        ALAN C. MENDELSON, ESQ.
            KARA DIANE PALMER, ESQ.                         PATRICK A. POHLEN, ESQ.
            JOHN W. ROBERTSON, ESQ.                            COOLEY GODWARD LLP
               VENTURE LAW GROUP                             FIVE PALO ALTO SQUARE
              4750 CARILLON POINT                             3000 EL CAMINO REAL
               KIRKLAND, WA 98033                           PALO ALTO, CA 94306-2155
                 (425) 739-8700                                  (650) 843-5000
</TABLE>
 
                            ------------------------
 
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
As soon as practicable after the effective date of this Registration Statement.
                            ------------------------
 
     If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box.  [ ]
 
     If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  [ ]
 
     If this form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]
 
     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [ ]
                            ------------------------
 
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.
 
================================================================================
<PAGE>   2
 
     Information contained herein is subject to completion or amendment. A
     registration statement relating to these securities has been filed with the
     Securities and Exchange Commission. These securities may not be sold nor
     may offers to buy be accepted prior to the time the registration statement
     becomes effective. This prospectus shall not constitute an offer to sell or
     the solicitation of an offer to buy nor shall there be any sale of these
     securities in any state in which such offer, solicitation or sale would be
     unlawful prior to registration or qualification under the securities laws
     of any such state.
 
   
                Subject to Completion, dated September 26, 1997
    
 
PROSPECTUS
 
                                2,750,000 Shares
 
                                 [CORIXA LOGO]
 
                                  Common Stock
                          ---------------------------
 
     All of the shares of Common Stock (the "Common Stock") offered hereby (the
"Offering") are being sold by Corixa Corporation ("Corixa" or the "Company").
Prior to the Offering, there has been no public market for the Common Stock of
the Company. It is currently estimated that the initial public offering price
will be between $12.00 and $14.00 per share. See "Underwriting" for a discussion
of the factors considered in determining the initial public offering price. The
Common Stock has been approved for quotation on the Nasdaq National Market under
the symbol "CRXA."
                          ---------------------------
 
    THE SHARES OF COMMON STOCK OFFERED HEREBY INVOLVE A HIGH DEGREE OF RISK.
                    SEE "RISK FACTORS" BEGINNING ON PAGE 6.
                          ---------------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
    AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
       NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE
          SECURITIES COMMISSION PASSED UPON THE ACCURACY OR
              ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION
                 TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<S>                             <C>                <C>                   <C>
================================================================================================
</TABLE>
 
<TABLE>
<CAPTION>
                                                       Underwriting
                                      Price            Discounts and           Proceeds to
                                    to Public         Commissions (1)          Company (2)
- ------------------------------------------------------------------------------------------------
<S>                             <C>                <C>                   <C>
Per Share......................         $                    $                      $
- ------------------------------------------------------------------------------------------------
Total (3)......................         $                    $                      $
================================================================================================
</TABLE>
 
(1) The Company has agreed to indemnify the underwriters (the "Underwriters")
    against certain liabilities, including liabilities under the Securities Act
    of 1933, as amended. See "Underwriting."
 
(2) Before deducting estimated expenses of $800,000 payable by the Company.
 
(3) The Company has granted the Underwriters a 30-day option to purchase up to
    412,500 additional shares of Common Stock on the same terms and conditions
    as set forth above, solely to cover over-allotments, if any. If such option
    is exercised in full, the total Price to Public, Underwriting Discounts and
    Commissions and Proceeds to Company will be $          , $          and
    $          , respectively. See "Underwriting."
                          ---------------------------
 
     The shares of Common Stock offered by this Prospectus are offered by the
Underwriters, subject to prior sale, to withdrawal, cancellation or modification
of the offer without notice, to delivery to and acceptance by the Underwriters
and to certain further conditions. It is expected that delivery of the shares
will be made at the offices of Lehman Brothers Inc., New York, New York on or
about             , 1997.
                          ---------------------------
 
LEHMAN BROTHERS
 
                INVEMED ASSOCIATES, INC.
                                 VECTOR SECURITIES INTERNATIONAL, INC.
 
           , 1997
<PAGE>   3
                        Corixa's Core Technologies

          (Graphic of syringe and components of vaccine contained therein)

        Corixa's T cell vaccine approach, which includes three proprietary core
technologies, targets the prevention and treatment of cancers and certain
infectious diseases.    




 
     The Company intends to furnish its stockholders with annual reports
containing audited financial statements examined by an independent public
accounting firm and will make available copies of quarterly reports for the
first three quarters of each fiscal year containing interim unaudited financial
information.
 
     The Company has applied for trademark registration for CORIXA(TM) and the
stylized Corixa logo. This Prospectus also contains trademarks and trade names
of other companies.
 
     CERTAIN PERSONS PARTICIPATING IN THE OFFERING MAY ENGAGE IN TRANSACTIONS
THAT STABILIZE, MAINTAIN OR OTHERWISE AFFECT THE PRICE OF THE COMMON STOCK. SUCH
TRANSACTIONS MAY INCLUDE THE PURCHASE OF SHARES OF COMMON STOCK FOLLOWING THE
PRICING OF THE OFFERING TO COVER A SYNDICATE SHORT POSITION IN THE COMMON STOCK
OR FOR THE PURPOSE OF MAINTAINING THE PRICE OF THE COMMON STOCK, AND THE
IMPOSITION OF PENALTY BIDS. FOR A DESCRIPTION OF THESE ACTIVITIES, SEE
"UNDERWRITING."
<PAGE>   4
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by the more detailed
information and the Financial Statements and Notes thereto appearing elsewhere
in this Prospectus, including information under "Risk Factors." The Common Stock
offered hereby involves a high degree of risk. Unless otherwise indicated, the
information in this Prospectus (i) assumes that the Underwriters' over-allotment
option will not be exercised, (ii) assumes the issuance of 445,139 shares of
Common Stock to be issued upon the net exercise of outstanding warrants upon the
closing of the Offering, (iii) reflects the filing of the Company's Amended and
Restated Certificate of Incorporation ("Restated Certificate of Incorporation"),
authorizing a class of 10,000,000 shares of undesignated Preferred Stock and
effecting the 1-for-3.3 reverse stock split with respect to the Common Stock and
(iv) gives effect to the automatic conversion of all outstanding shares of
Series A Preferred Stock and Series B Preferred Stock into an equal number of
shares of Common Stock upon the closing of the Offering. Certain terms are
defined in the Glossary of Scientific Terms on page 74 of this Prospectus.
 
                                  THE COMPANY
 
     Corixa Corporation ("Corixa" or the "Company") is focused on the discovery
and early clinical development of vaccine products that induce specific and
potent pathogen- or tumor-reactive T lymphocyte ("T cell") responses for the
treatment and prevention of cancers and certain infectious diseases. The Company
employs the following three proprietary core technology platforms, which
together comprise the elements the Company believes are necessary for effective
T cell vaccines: (i) microsphere delivery systems that specifically activate
appropriate T cell responses; (ii) adjuvants that specifically enhance
appropriate T cell responses; and (iii) disease-specific antigens that are
essential to elicit appropriate T cell responses. The Company's strategy is to
dedicate its resources to vaccine discovery and to establish corporate
partnerships as early in the development process as possible for all aspects of
product development and commercialization. Corixa believes this research- and
partner-driven approach creates significant scientific, operational and
financial advantages for the Company and accelerates the commercial development
of new therapeutic and prophylactic T cell vaccines, as well as related
diagnostic products. The Company has entered into corporate partnerships with
nine pharmaceutical, biotechnology and diagnostic companies, including
SmithKline Beecham Biologicals S.A. ("SmithKline Beecham"), Pasteur Merieux
Connaught, a subsidiary of Rhone-Poulenc Group ("PMC") and Abbott Laboratories
("Abbott").
 
     Although commercially available vaccines can prevent infection by a variety
of pathogens such as bacteria, viruses and parasites through antibody-based
immune responses, these responses are not sufficient to eliminate cancers or
certain infectious diseases. Moreover, commercially available vaccines do not
address therapeutic treatment of such diseases. To induce an effective immune
response against such diseases, T cells must be activated. Although Corixa's
technological approach is unproven in humans, the Company believes that the
integration of its three proprietary core technologies will result in the
activation of a protective immune response, and that this integration may be
essential for truly effective vaccines against cancers and certain infectious
diseases. The markets for such vaccine products are extensive, particularly in
oncology, given that current treatments such as chemotherapy and radiation
therapy may not lead to lasting cure or prevention.
 
     Since its inception, Corixa has developed a diverse portfolio of potential
products and corporate partnerships based on the breadth of its proprietary core
technologies and its expertise in antigen discovery. Products based on the
Company's technologies are currently in the discovery, preclinical or early
clinical investigation stages, with the exception of a certain diagnostic
product, the sale of which has resulted in immaterial revenues to date.
 
     -      VACCINES. The Company currently has four cancer vaccine programs and
       one infectious disease vaccine program. The Company has established
       corporate partnerships with SmithKline Beecham for the development of
       vaccines for breast and prostate cancer and for tuberculosis. In
       addition, the Company is sponsoring Phase I clinical trials for Her-2/neu
       peptide vaccines in breast and ovarian cancer, as well as pursuing a lung
       cancer vaccine program.
 
                                        3
<PAGE>   5
 
     -      ADJUVANTS. Corixa has identified a protein, known as Leishmania
       elongation Initiating Factor ("LeIF"), which functions as a potent
       adjuvant for enhancing immune responses. The Company has established a
       corporate partnership with PMC for the use of LeIF as a novel adjuvant to
       be used in vaccines for influenza, respiratory syncytial virus, HIV,
       tuberculosis and malaria.
 
     -      DIAGNOSTICS. The Company pursues corporate partnerships for cancer
       and infectious disease diagnostics to complement its therapeutic research
       efforts and to expand its scientific platform. The Company has
       established corporate partnerships for the development of diagnostics to
       detect certain infectious diseases, including tuberculosis, with a number
       of diagnostic companies, including Abbott, DiaMed S.A. ("DiaMed") and
       Centocor UK Limited, a division of Centocor, Inc. ("Centocor").
 
     -      OTHER PRODUCTS. The Company believes that its three core
       technologies create additional product opportunities outside of its
       primary focus on vaccine development. The Company has established
       corporate partnerships for the development of products for adoptive
       immunotherapy of cancer with CellPro, Incorporated ("CellPro"), products
       for the treatment of certain autoimmune diseases with ZymoGenetics, Inc.,
       a wholly-owned subsidiary of Novo Nordisk A/S ("ZymoGenetics"), products
       based on LeIF as an immunomodulator with Vical Incorporated ("Vical") and
       certain animal health products with Heska Corporation ("Heska").
 
     Corixa's objective is to leverage its proprietary core technologies,
research expertise and intellectual property to become the leading
research-based biotechnology company focused on the discovery of T cell
vaccines, utilizing corporate partnerships to accelerate and fund product
development and commercialization. Key elements of the Company's strategy
include: (i) integrating its three proprietary core technologies into
therapeutic and prophylactic vaccine products; (ii) establishing corporate
partnerships for vaccine products prior to the initiation of Phase II clinical
trials to reduce the costs and risks of product development and to enhance
commercial opportunities; and (iii) partnering each of its proprietary core
technologies to commercial entities to improve such entities' own existing or
development-stage vaccines, and to create new, non-vaccine products, including
diagnostics. The Company also seeks to obtain technologies that complement and
expand its existing technology base and has licensed or acquired product and
marketing rights from a number of research and academic institutions. To date,
substantially all of Corixa's revenues have resulted from corporate
partnerships, other research, development and licensing arrangements, research
grants and interest income, and only minimal revenues have been generated from
the sale of one diagnostic product.
 
     Corixa believes that one of its key competitive advantages is its antigen
discovery program, through which the Company identifies antigens that are either
uniquely expressed or markedly over-expressed, and may therefore represent the
most effective antigens for a particular vaccine. Approximately half of Corixa's
scientific personnel are dedicated to antigen discovery. The Company's antigen
discovery activities include, among others, tumor tissue procurement and tumor
propagation, expression cloning and immunological characterization of candidate
tumor vaccine antigens. The Company has filed numerous patent applications
seeking both composition of matter and vaccine and diagnostic method of use
claims that cover approximately 160 gene sequences that are either uniquely
expressed or markedly over-expressed by breast cancer cells, approximately 60
gene sequences that are either uniquely expressed or markedly over-expressed by
prostate tumor cells or prostate tissue, and approximately 70 gene sequences
that are expressed by Mycobacterium tuberculosis.
 
     Corixa is a principal stockholder in, and has received licenses in the
field of cancer vaccines from, GenQuest, Inc. ("GenQuest"), a privately-held
functional genomics company engaged in discovery of new genes related to the
transformation of normal cells into cancer cells and research of novel genes
that are uniquely expressed by cancer cells. The Company believes its
relationship with GenQuest will enable the identification of additional genes
that are uniquely expressed by cancer cells and are useful in the Company's
research programs.
 
     The Company's principal executive offices are located at 1124 Columbia
Street, Suite 200, Seattle, Washington 98104 and its telephone number is (206)
667-5711. The Company was founded and incorporated in Delaware on September 8,
1994.
 
                                        4
<PAGE>   6
 
                                  THE OFFERING
 
<TABLE>
<S>                                            <C>
Common Stock offered by the Company..........  2,750,000 shares
Common Stock to be outstanding after the
  Offering(1)................................  10,994,331 shares
Nasdaq National Market symbol................  CRXA
Use of proceeds..............................  To fund research and development and for
                                               working capital and general corporate
                                               purposes. See "Use of Proceeds."
</TABLE>
 
                         SUMMARY FINANCIAL INFORMATION
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
   
<TABLE>
<CAPTION>
                                       INCEPTION
                                     (SEPTEMBER 8,            YEAR ENDED           SIX MONTHS ENDED
                                        1994) TO             DECEMBER 31,              JUNE 30,        INCEPTION TO
                                      DECEMBER 31,        -------------------     ------------------     JUNE 30,
                                          1994             1995        1996        1996        1997        1997
                                   ------------------     -------     -------     -------     ------   ------------
<S>                                <C>                    <C>         <C>         <C>         <C>      <C>
STATEMENTS OF OPERATIONS DATA:
Revenues:
  Collaborative agreements.......       $     --          $ 2,411     $ 4,402     $ 1,731     $6,939     $ 13,752
  Government grants..............             --              304       1,403         626        554        2,261
                                        --------          -------     -------     -------     ------     --------
         Total revenues..........             --            2,715       5,805       2,357      7,493       16,013
Operating expenses:
  Research and development(2)....            867            7,040       9,995       4,708      7,104       25,006
  General and administrative ....            205              532         781         438        779        2,297
                                        --------          -------     -------     -------     ------     --------
         Total operating
           expenses..............          1,072            7,572      10,776       5,146      7,883       27,303
Income (loss) from operations....         (1,072)          (4,857)     (4,971)     (2,789)      (390)     (11,290)
Interest income, net.............             83              691         476         213        235        1,485
Other income(3)..................             --               16         348         174        187          551
                                        --------          -------     -------     -------     ------     --------
Net income (loss)................       $   (989)         $(4,150)    $(4,147)    $(2,402)    $   32     $ (9,254)
                                        ========          =======     =======     =======     ======     ========
Pro forma net income (loss) per
  share(4).......................                                     $ (0.50)                $ 0.00
                                                                      =======                 ======
Shares used in computing pro
  forma net income (loss) per
  share(4).......................                                       8,343                  8,536
                                                                      =======                 ======
</TABLE>
    
 
<TABLE>
<CAPTION>
                                                                                     JUNE 30, 1997
                                                                               --------------------------
                                                                                             PRO FORMA
                                                                               ACTUAL      AS ADJUSTED(5)
                                                                               -------     --------------
<S>                                                                            <C>         <C>
BALANCE SHEET DATA:
Cash, cash equivalents and securities available-for-sale.....................  $15,047        $ 47,495
Working capital..............................................................   12,798          45,246
Total assets.................................................................   20,030          52,478
Long-term obligations, less current portion..................................    5,086           5,086
Deficit accumulated during development stage.................................   (9,295)         (9,295)
Total stockholders' equity...................................................   11,872          44,320
</TABLE>
 
- ---------------
 
(1) Excludes (i) 1,187,614 shares of Common Stock issuable upon exercise of
    stock options outstanding as of June 30, 1997, 378,334 of which are fully
    vested, at a weighted average exercise price of $0.71 per share, (ii)
    694,512 shares of Common Stock issuable upon exercise of warrants expected
    to remain outstanding after the Offering at a weighted average exercise
    price of $8.04 per share, (iii) an aggregate of 1,031,039 shares reserved
    for future issuance under the Company's Amended and Restated 1994 Stock
    Option and Restricted Stock Plan (the "1994 Plan"), 1997 Employee Stock
    Purchase Plan (the "Purchase Plan"), and 1997 Directors' Stock Option Plan
    (the "Directors' Plan"), each of which was approved by the Board of
    Directors of the Company on July 25, 1997 and (iv) 3,029 shares of Common
    Stock issued after June 30, 1997 in connection with a collaboration
    agreement. See "Management -- Stock Option Plans" and "Description of
    Capital Stock."
 
(2) Included in research and development expenses for the period from inception
    (September 8, 1994) to December 31, 1994 is $428,059 related to the purchase
    of in-process research and development.
 
(3) Other income includes proceeds received for management and administrative
    services.
 
(4) See Note 1 of Notes to Financial Statements for information regarding the
    computation of pro forma net income (loss) per share.
 
(5) As adjusted to reflect the sale of the 2,750,000 shares of Common Stock
    offered hereby at an assumed initial public offering price of $13.00 per
    share after deducting underwriting discounts and commissions and estimated
    Offering expenses and the receipt of the estimated net proceeds therefrom.
    See "Use of Proceeds."
 
                                        5
<PAGE>   7
 
                                  RISK FACTORS
 
     An investment in the shares of Common Stock offered hereby involves a high
degree of risk. Accordingly, prospective investors should consider carefully the
following factors, together with the information contained in this Prospectus,
in evaluating the Company and its business before purchasing the shares of
Common Stock offered hereby. This Prospectus contains forward-looking statements
that involve risk and uncertainty. Actual results and the timing of certain
events could differ materially from those projected in the forward-looking
statements as a result of the risk factors set forth below and other factors
discussed elsewhere in this Prospectus. See "Special Note Regarding
Forward-Looking Statements."
 
UNCERTAINTIES RELATED TO EARLY STAGE OF DEVELOPMENT
 
     Corixa is at an early stage in the development of its therapeutic,
prophylactic and diagnostic products. To date, almost all of the Company's
revenues have resulted from payments made under agreements with its corporate
partners, and the Company expects that most of its revenues for the foreseeable
future will continue to result from existing and future corporate partnerships,
if any. The Company has generated only minimal revenues from diagnostic product
sales and no revenues from therapeutic product sales since inception. Vaccine
products that may result from the Company's research and development programs
are not expected to be commercially available for a number of years, if at all,
and it will be a number of years, if ever, before Corixa will receive any
significant revenues from commercial sales of such products. There can be no
assurance that the Company will receive anticipated revenues under existing
corporate partnerships, that the Company will be able to enter into any
additional corporate partnerships or that the Company will ever achieve
consistent profitability. See "Business -- Corixa's Products in Development."
 
UNCERTAINTIES RELATED TO TECHNOLOGY AND PRODUCT DEVELOPMENT
 
     The Company's technological approach to the development of therapeutic and
prophylactic vaccines for cancers and certain infectious diseases is unproven in
humans. Products based on the Company's technologies are currently in the
discovery, preclinical or early clinical investigation stages, and to date,
neither the Company nor any of its corporate partners have conducted any
clinical trials that incorporate the Company's proprietary microsphere delivery
systems or its proprietary adjuvants. In addition, no therapeutic vaccines for
cancer or infectious diseases targeted by the Company have been successfully
commercialized by the Company or others. There can be no assurance that the
Company will be able to successfully develop effective vaccines for such
diseases in a reasonable time frame, if ever, or that such vaccines will be
capable of being commercialized. In addition to its internal development
programs, the Company in-licenses and acquires technologies to enhance its
product pipeline. There can be no assurance that any in-licensed technologies
will prove to be effective or will result in the successful development of
commercial products. See "Business -- Corixa's Core Technology Platforms" and
"-- Patents and Proprietary Technology."
 
     A majority of Corixa's programs are currently in the discovery stage or in
preclinical development, and only two of the Company's therapeutic vaccine
products have advanced to Phase I clinical trials. The Company's vaccines have
not been demonstrated to be safe or effective in clinical settings. There can be
no assurance that any of the Company's programs will move beyond its current
stage of development. For example, in a Company-funded early safety trial of the
Muc-1 antigen conducted by the University of Pittsburgh, the Company did not
observe a level of efficacy sufficient to support further product development.
Assuming the Company's research does advance, certain preclinical development
efforts will be necessary to determine whether any product is safe to enter
clinical trials. Under certain of the Company's existing corporate partnerships,
the respective corporate partner has primary responsibility for the clinical
development of a product. There can be no assurance that any such corporate
partner will pursue clinical development in a timely or effective manner, if at
all. If such a product receives authorization from the United States Food and
Drug Administration ("FDA") to enter clinical trials, then it may be, and in the
case of vaccine products will be, subjected to a multi-phase, multi-center
clinical study to determine its safety and efficacy. It is difficult to predict
the number or extent of clinical trials required or the period of mandatory
patient follow-up. Assuming clinical trials of any product are successful and
other data are satisfactory, the Company or its applicable corporate partner
will submit an application to the FDA and appropriate regulatory bodies in other
countries
 
                                        6
<PAGE>   8
 
to seek permission to market the product. Typically, the review process at the
FDA takes several years, and there can be no assurance that the FDA will approve
the Company's or its corporate partner's application or will not require
additional clinical trials or other data prior to approval. Furthermore, even if
regulatory approval is ultimately obtained, delays in the approval process could
have a material adverse effect on the Company's business, financial condition
and results of operations. In addition, there can be no assurance that any
product can be produced in commercial quantities at a reasonable cost or that
such product will be successfully marketed. See "Business -- Corporate
Partnerships," "-- Certain License Agreements" and "-- Government Regulation."
 
DEPENDENCE ON AND MANAGEMENT OF EXISTING AND FUTURE CORPORATE PARTNERSHIPS
 
     The success of Corixa's business strategy is largely dependent on its
ability to enter into multiple corporate partnerships and to effectively manage
the numerous relationships that may exist as a result of this strategy. Corixa
has established significant relationships with several corporate partners as of
the date of this Prospectus. For example, the Company has entered into three
collaboration and license agreements with SmithKline Beecham for the research,
development and commercialization of vaccine products aimed at the prevention
and/or treatment of tuberculosis, breast cancer and prostate cancer. In
addition, Corixa has established corporate partnerships with CellPro and
GenQuest, among others. A large percentage of the Company's revenues during the
year ended December 31, 1997 will be derived from research and development and
other funding under such corporate partnerships, and the termination of any of
these corporate partnerships would have a material adverse effect on the
Company's business, financial condition and results of operations. Several of
the Company's corporate partners have entered into agreements granting them
options to license certain aspects of the Company's technology. There can be no
assurance that any such corporate partner will exercise its option to license
such technology. The Company has also entered into corporate partnerships with
several companies for the development, commercialization and sale of diagnostic
products incorporating the Company's proprietary antigen technology. There can
be no assurance that any such diagnostic corporate partnership will ever
generate significant revenues. Furthermore, Corixa is currently engaged in
discussions with a number of pharmaceutical and diagnostic companies with
respect to potential corporate partnering arrangements covering various aspects
of the Company's technologies. However, due in part to the early stage of
Corixa's technologies, the process of establishing corporate partnerships such
as the Company's collaborations with SmithKline Beecham is difficult,
time-consuming and involves significant uncertainty, and there can be no
assurance that such discussions will lead to the establishment of any new
corporate partnership on favorable terms, or at all, or that if established, any
such corporate partnership will result in the successful development of the
Company's products or the generation of significant revenues.
 
     Because Corixa enters into research and development collaborations with
corporate partners at an early stage of product development, the Company's
success is highly reliant upon the performance of its corporate partners. Under
existing corporate partnership arrangements, the Company's corporate partners
are generally required to undertake and fund certain research and development
activities with the Company, make payments upon achievement of certain
scientific milestones and pay royalties or make profit-sharing payments when and
if a product is commercialized. The amount and timing of resources to be devoted
to activities by its existing or future corporate partners are not within the
direct control of the Company, and there can be no assurance that any of the
Company's existing or future corporate partners will commit sufficient resources
to Corixa's research and development programs or the commercialization of its
products. If any corporate partner fails to conduct its activities in a timely
manner, or at all, the Company's preclinical or clinical development related to
such corporate partnership could be delayed or terminated. There can be no
assurance that the Company's corporate partners will perform their obligations
as expected. There can also be no assurance that the Company's current corporate
partners or future corporate partners, if any, will not pursue existing or other
development-stage products or alternative technologies in preference to those
being developed in collaboration with the Company, or that disputes will not
arise with respect to ownership of technology developed under any such corporate
partnership. Finally, there can be no assurance that any of the Company's
current corporate partnerships will not be terminated by its corporate partners
or that the Company will be able to negotiate additional corporate partnerships
in the future on acceptable terms, or at all.
 
                                        7
<PAGE>   9
 
     Because the success of the Company's business is largely dependent upon its
ability to enter into multiple corporate partnerships and to effectively manage
the numerous issues that arise from such partnerships, management of these
relationships will require, at a minimum, significant time and effort from
Corixa's management team and effective allocation of the Company's resources to
multiple projects, as well as an ability to obtain and retain management,
scientific and other personnel sufficient to accomplish the foregoing. There can
be no assurance that Corixa's need to simultaneously manage a number of
corporate partnerships will be successful, and the failure to effectively manage
such corporate partnerships would have a material adverse effect on the
Company's business, financial condition and results of operations. See
"Business -- Corixa's Strategy," "-- Corporate Partnerships" and
"-- Relationship with GenQuest, Inc."
 
DEPENDENCE ON IN-LICENSED TECHNOLOGY
 
     In addition to its dependence on existing and future corporate
partnerships, Corixa's success is also dependent on its ability to enter into
licensing arrangements with commercial or academic entities to obtain technology
that is advantageous or necessary to the development and commercialization of
Corixa's products. The Company is party to various license agreements that give
it rights to use certain technologies in its and its corporate partners'
discovery, research, development and commercialization activities. Disputes may
arise as to the inventorship and corresponding rights in inventions and know-how
resulting from the joint creation or use of intellectual property by the Company
and its licensors or scientific collaborators. Additionally, many of the
Company's in-licensing agreements contain milestone-based termination
provisions. The Company's failure to meet any significant milestones in a
particular agreement could allow the licensor to terminate such agreement. There
can be no assurance that the Company will be able to negotiate additional
license agreements in the future on acceptable terms, if at all, that any of its
current license agreements will not be terminated or that it will be able to
maintain the exclusivity of its exclusive licenses. In the event the Company is
unable to obtain or maintain licenses to technology advantageous or necessary to
the Company's business, Corixa and its corporate partners may be required to
expend significant time and resources to develop or in-license similar
technology, and there can be no assurance that the Company and its corporate
partners will be successful in this regard. If the Company cannot acquire or
develop necessary technology, it may be prevented from commercializing certain
of its products. Any such event would have a material adverse effect on the
Company's business, financial condition and results of operations. See
"Business -- Corixa's Strategy," "-- Certain License Agreements" and
"-- Scientific Collaborators."
 
DEPENDENCE ON PROPRIETARY TECHNOLOGY AND UNCERTAINTY OF PATENT PROTECTION
 
     Corixa's success will depend in part on its ability and that of its
corporate partners to obtain and enforce their respective patents and maintain
trade secrets, both in the United States and in other countries. As of June 30,
1997, Corixa owned or had licensed eight issued United States patents that
expire at various times between December 2008 and February 2014, 55
corresponding issued foreign patents, 76 pending United States patent
applications, as well as 19 corresponding international filings under the Patent
Cooperation Treaty and 111 pending foreign national patent applications. There
can be no assurance that the Company, its corporate partners or its licensors
have or will develop or obtain rights to products or processes that are
patentable, that patents will issue from any of the pending applications owned
or licensed by the Company or its corporate partners, that any claims allowed
will issue, or in the event of issuance, will be sufficient to protect the
technology owned by or licensed to the Company or its corporate partners. The
Company has licensed certain patent applications from Southern Research
Institute ("SRI") related to the Company's microsphere encapsulation technology,
one of which is currently the subject of an opposition proceeding before the
European Patent Office. There can be no assurance that SRI will prevail in this
opposition proceeding or that any patents will issue in Europe related to such
technology. There can also be no assurance that the Company's or its corporate
partners' current patents, or patents that issue on pending applications, will
not be challenged, invalidated, infringed or circumvented, or that the rights
granted thereunder will provide proprietary protection or competitive advantages
to Corixa. Patent applications in the United States are maintained in secrecy
until patents issue, patent applications in certain foreign countries are not
generally published until many months or years after they are filed, and
publication of technological developments in the scientific and patent
literature often occurs long after the date of such developments. Accordingly,
the
 
                                        8
<PAGE>   10
 
Company cannot be certain that it or one of its corporate partners was the first
to invent the subject matter covered by any patent application or that it or one
of its corporate partners was the first to file a patent application for any
such invention.
 
     Patent law relating to the scope and enforceability of claims in the fields
in which Corixa operates is still evolving. The patent positions of
biotechnology and biopharmaceutical companies, including the Company, are highly
uncertain and involve complex legal and technical questions for which legal
principles are not firmly established. The degree of future protection for the
Company's proprietary rights, therefore, is highly uncertain. In this regard,
there can be no assurance that independent patents will issue from each of the
76 pending United States patent applications referenced above, which include
many interrelated applications directed to common or related subject matter. In
addition, there may be issued patents and pending applications owned by others
directed to technologies relevant to the Company's or its corporate partners'
research, development and commercialization efforts. There can be no assurance
that Corixa's or its corporate partners' technology can be developed and
commercialized without a license to such patents or that such patent
applications will not be granted priority over patent applications filed by
Corixa or one of its corporate partners.
 
     The commercial success of Corixa depends significantly on its ability to
operate without infringing the patents and proprietary rights of third parties,
and there can be no assurance that the Company's and its corporate partners'
technologies do not or will not infringe the patents or proprietary rights of
others. A number of pharmaceutical companies, biotechnology companies,
universities and research institutions may have filed patent applications or may
have been granted patents that cover technologies similar to the technologies
owned, optioned by or licensed to the Company or its corporate partners. In
addition, the Company is unable to determine the patents or patent applications
that may materially affect the Company's or its corporate partners' ability to
make, use or sell any products. The existence of third party patent applications
and patents could significantly reduce the coverage of the patents owned,
optioned by or licensed to the Company or its corporate partners and limit the
ability of the Company or its corporate partners to obtain meaningful patent
protection. If patents containing competitive or conflicting claims are issued
to third parties, the Company or its corporate partners may be enjoined from
pursuing research, development or commercialization of products or be required
to obtain licenses to these patents or to develop or obtain alternative
technology. There can be no assurance that the Company or its corporate partners
will not be so enjoined or will be able to obtain any license to the patents and
technologies of third parties on acceptable terms, if at all, or will be able to
obtain or develop alternative technologies. If the Company or any of its
corporate partners is enjoined from pursuing its research, development or
commercialization activities or if any such license is or alternative
technologies are not obtained or developed, the Company or such corporate
partner may be delayed or prevented from commercializing its products, which
would have a material adverse effect on the Company's business, financial
condition and results of operations.
 
     There can be no assurance that third parties will not independently develop
similar or alternative technologies to those of the Company, duplicate any of
the technologies of the Company, its corporate partners or its licensors, or
design around the patented technologies developed by the Company, its corporate
partners or its licensors. The occurrence of any of these events would have a
material adverse effect on the Company's business, financial condition and
results of operations.
 
     Litigation may also be necessary to enforce patents issued or licensed to
the Company or its corporate partners or to determine the scope and validity of
a third party's proprietary rights. Corixa could incur substantial costs if
litigation is required to defend itself in patent suits brought by third
parties, if Corixa participates in patent suits brought against or initiated by
its corporate partners or if Corixa initiates such suits, and there can be no
assurance that funds or resources would be available to the Company in the event
of any such litigation. Additionally, there can be no assurance that the Company
or its corporate partners would prevail in any such action. An adverse outcome
in litigation or an interference to determine priority or other proceeding in a
court or patent office could subject the Company to significant liabilities,
require disputed rights to be licensed from other parties or require the Company
or its corporate partners to cease using certain technology, any of which may
have a material adverse effect on the Company's business, financial condition
and results of operations.
 
                                        9
<PAGE>   11
 
     Corixa also relies on trade secrets and proprietary know-how, especially in
circumstances in which patent protection is not believed to be appropriate or
obtainable. Corixa attempts to protect its proprietary technology in part by
confidentiality agreements with its employees, consultants and advisors. These
agreements generally provide that all confidential information developed or made
known to the individual by Corixa during the course of the individual's
relationship with the Company will be kept confidential and not disclosed to
third parties except in specific circumstances. These agreements also generally
provide that all inventions conceived by the individual in the course of
rendering services to the Company shall be the exclusive property of the
Company. There can be no assurance, however, that these agreements will provide
meaningful protection or adequate remedies for any breach, or that the Company's
trade secrets will not otherwise become known or be independently discovered by
its competitors, any of which could have a material adverse effect on the
Company's business, financial condition and results of operations. See
"Business -- Corixa's Core Technology Platforms," "-- Patents and Proprietary
Technology" and "-- Scientific Collaborators."
 
MANAGEMENT OF GROWTH
 
     The Company's future growth may cause a significant strain on its
management, operational, financial and other resources. The Company's ability to
manage its growth effectively will require it to implement and improve its
operational, financial, manufacturing and management information systems and to
expand, train, manage and motivate its employees. These demands may require the
addition of new management personnel and the development of additional expertise
by management. Any increase in resources devoted to product development and
marketing and sales efforts without a corresponding increase in the Company's
operational, financial, manufacturing and management information systems could
have an adverse effect on the Company's performance. The failure of the
Company's management team to effectively manage growth could have a material
adverse effect on the Company's business, financial condition and results of
operations.
 
HISTORY OF OPERATING LOSSES; ACCUMULATED DEFICIT; FLUCTUATIONS IN FUTURE
EARNINGS
 
     Corixa has experienced significant operating losses in each year since its
inception on September 8, 1994. As of June 30, 1997, the Company's accumulated
deficit was approximately $9.3 million. The Company may incur substantial
additional operating losses over at least the next several years. Such losses
have been and may continue to be principally the result of the various costs
associated with the Company's discovery, research and development programs,
preclinical studies and clinical activities. Substantially all of the Company's
revenues to date have resulted from corporate partnerships, other research,
development and licensing arrangements, research grants and interest income. The
Company's ability to achieve a consistent, profitable level of operations is
dependent in large part upon entering into agreements with corporate partners
for product discovery, research, development and commercialization, obtaining
regulatory approvals for its products and successfully manufacturing and
marketing commercial products. There can be no assurance that the Company will
be able to achieve consistent profitability. In addition, payments under
corporate partnerships and licensing arrangements will be subject to significant
fluctuations in both timing and amounts, resulting in quarters of profitability
and quarters of losses by the Company. Therefore, the Company's results of
operations for any period may fluctuate and may not be comparable to the results
of operations for any other period. See "-- Dependence on and Management of
Existing and Future Corporate Partnerships" and "Management's Discussion and
Analysis of Financial Condition and Results of Operations."
 
FUTURE CAPITAL NEEDS; UNCERTAINTY OF ADDITIONAL FUNDING
 
     The Company will require substantial capital resources after the Offering
in order to conduct its operations. The Company's future capital requirements
will depend on many factors, including, among others, the following: continued
scientific progress in its discovery, research and development programs; the
magnitude and scope of these activities; the ability of the Company to maintain
existing and establish additional corporate partnerships and licensing
arrangements; progress with preclinical studies and clinical trials; the time
and costs involved in obtaining regulatory approvals; the costs involved in
preparing, filing, prosecuting, maintaining, defending and enforcing patent
claims; the potential need to develop, acquire or license new technologies and
products; and other factors not within the Company's control. The Company
 
                                       10
<PAGE>   12
 
intends to seek such additional funding through corporate partnerships, public
or private equity or debt financings and capital lease transactions; however,
there can be no assurance that additional financing will be available on
acceptable terms, if at all. Additional equity financings could result in
significant dilution to stockholders after the Offering. If sufficient capital
is not available, the Company may be required to delay, reduce the scope of,
eliminate or divest one or more of its discovery, research or development
programs, any of which could have a material adverse effect on the Company's
business, financial condition and results of operations. The Company believes
that the net proceeds from the Offering, its existing capital resources,
committed payments under its existing corporate partnerships and licensing
arrangements, equipment financing and interest income will be sufficient to fund
its current and planned operations for at least 18 months following the
Offering. However, there can be no assurance that such funds will be sufficient
to meet the capital needs of the Company. In addition, a substantial number of
the payments to be made by Corixa's corporate partners and other licensors are
dependent upon the achievement by the Company of development and regulatory
milestones. Failure to achieve such milestones would have a material adverse
effect on the Company's future capital needs. In addition, the Company has
entered into an option agreement with one of its corporate partners pursuant to
which such corporate partner has agreed to pay certain consideration in exchange
for exclusive options to license two of Corixa's early-stage antigen discovery
programs in two cancer targets. If such options are exercised, then at the
election of the corporate partner, such consideration will either be credited
against future milestone payments or converted into Common Stock of Corixa. In
the event either or both of such options are not exercised or extended prior to
February 28, 1998 with respect to one cancer target and August 31, 1998 with
respect to the other cancer target, the Company will be required to repay the
amounts paid by such corporate partner for such option(s) over a three-year
period beginning in March 2000. See "Use of Proceeds," "Management's Discussion
and Analysis of Financial Condition and Results of Operations" and
"Business -- Corporate Partnerships."
 
DEPENDENCE ON KEY PERSONNEL
 
     The Company is highly dependent on the principal members of its scientific
and management staff, the loss of whose services might significantly delay or
prevent the Company's achievement of its scientific or business objectives.
Competition among biotechnology and biopharmaceutical companies for qualified
employees is intense, and the ability to retain and attract qualified
individuals is critical to the Company's success. There can be no assurance that
the Company will be able to attract and retain such individuals currently or in
the future on acceptable terms, or at all, and the failure to do so would have a
material adverse effect on the Company's business, financial condition and
results of operations. In addition, the Company does not maintain "key person"
life insurance on any officer, employee or consultant of the Company.
 
     Corixa also has relationships with scientific collaborators at academic and
other institutions, some of whom conduct research at the Company's request or
assist the Company in formulating its research and development strategy. These
scientific collaborators are not employees of the Company and may have
commitments to, or consulting or advisory contracts with, other entities that
may limit their availability to the Company. The Company has limited control
over the activities of these scientific collaborators and, except as otherwise
required by its license, consulting and sponsored research agreements, can
expect only limited amounts of time to be dedicated to the Company's activities
by such individuals. Failure of any such persons to devote sufficient time and
resources to the Company's programs could have a material adverse effect on the
Company's business, financial condition and results of operations. In addition,
these collaborators may have arrangements with other companies to assist such
companies in developing technologies that may prove competitive to those of
Corixa. See "Management," "Business -- Corporate Partnerships," "-- Certain
License Agreements" and "-- Scientific Collaborators."
 
INTENSE COMPETITION
 
     The biotechnology and biopharmaceutical industries are intensely
competitive. Several biotechnology and biopharmaceutical companies, as well as
certain research organizations, currently engage in or have in the past engaged
in efforts related to the development of vaccines for the treatment and
prevention of cancer and various infectious diseases, as well as the development
of diagnostic products for infectious disease indications.
 
                                       11
<PAGE>   13
 
Many companies, including Corixa's corporate partners, as well as academic and
other research organizations, are also developing alternative therapies to treat
cancer and infectious diseases and, in this regard, are competitive with the
Company. Moreover, technology controlled by third parties that may be
advantageous to the Company's business may be acquired or licensed by
competitors of the Company, thereby preventing the Company from obtaining such
technology on favorable terms, or at all.
 
     Many of the companies developing competing technologies and products have
significantly greater financial resources and expertise in discovery, research
and development, manufacturing, preclinical and clinical testing, obtaining
regulatory approvals and marketing than Corixa or its corporate partners. Other
smaller companies may also prove to be significant competitors, particularly
through collaborative arrangements with large and established companies.
Academic institutions, government agencies and other public and private research
organizations may also conduct research, seek patent protection and establish
collaborative arrangements for discovery, research, clinical development and
marketing of products similar to those of the Company. These companies and
institutions compete with the Company in recruiting and retaining qualified
scientific and management personnel as well as in acquiring technologies
complementary to the Company's programs. Corixa and its corporate partners will
face competition with respect to product efficacy and safety, the timing and
scope of regulatory approvals, availability of resources, reimbursement
coverage, price and patent position, including potentially dominant patent
positions of others. There can be no assurance that competitors will not develop
more effective or more affordable products, or achieve earlier patent protection
or product commercialization than the Company and its corporate partners, or
that such competitive products will not render the Company's products obsolete.
See "Business -- Competition."
 
LACK OF MANUFACTURING EXPERIENCE; RELIANCE ON CONTRACT MANUFACTURERS
 
     Corixa does not have significant manufacturing facilities. Although the
Company currently manufactures limited quantities of certain antigens and
adjuvants, including LeIF, to conduct preclinical studies and to supply
corporate partners, the Company intends to rely on third party contract
manufacturers to produce large quantities of such substances for clinical trials
and product commercialization. Additionally, the Company may be required to rely
on contract manufacturers to produce antigens, adjuvants and other components of
its products for research and development, preclinical and clinical purposes.
Corixa's vaccines and other products have never been manufactured on a
commercial scale, and there can be no assurance that such products can be
manufactured at a cost or in quantities necessary to make them commercially
viable. There can be no assurance that third party manufacturers will be able to
meet the Company's needs with respect to timing, quantity or quality. If the
Company is unable to contract for a sufficient supply of required products and
substances on acceptable terms, or if it should encounter delays or difficulties
in its relationships with manufacturers, the Company's preclinical and clinical
testing would be delayed, thereby delaying the submission of products for
regulatory approval or the market introduction and subsequent sales of such
products. Any such delay may have a material adverse effect on the Company's
business, financial condition and results of operations. Moreover, contract
manufacturers that the Company may use must continually adhere to current Good
Manufacturing Practices ("GMP") regulations enforced by the FDA through its
facilities inspection program. If the facilities of such manufacturers cannot
pass a pre-approval plant inspection, the FDA premarket approval of the
Company's products will not be granted.
 
LACK OF MARKETING EXPERIENCE; DEPENDENCE ON THIRD PARTIES
 
     The Company currently has no sales, marketing or distribution capability.
The Company intends to rely on its current and future corporate partners, if
any, to market its products; however, there can be no assurance that such
corporate partners have effective sales forces and distribution systems. If the
Company is unable to maintain or establish such relationships and is required to
market any of its products directly, the Company will have to develop a
marketing and sales force with technical expertise and with supporting
distribution capabilities. There can be no assurance that the Company will be
able to maintain or establish such relationships with third parties or develop
in-house sales and distribution capabilities. To the extent that the Company
depends on its corporate partners or third parties for marketing and
distribution, any revenues
 
                                       12
<PAGE>   14
 
received by the Company will depend upon the efforts of such corporate partners
or third parties, and there can be no assurance that such efforts will be
successful.
 
GOVERNMENT REGULATION
 
     The preclinical testing and clinical trials of any products developed by
the Company or its corporate partners and the manufacturing, labeling, sale,
distribution, export or import, marketing, advertising and promotion of any new
products resulting therefrom are subject to regulation by federal, state and
local governmental authorities in the United States, the principal one of which
is the FDA, and by similar agencies in other countries. Any product developed by
the Company or its corporate partners must receive all relevant regulatory
approvals or clearances before it may be marketed in a particular country. The
regulatory process, which includes extensive preclinical studies and clinical
trials of each product in order to establish its safety and efficacy, is
uncertain, can take many years and requires the expenditure of substantial
resources. Data obtained from preclinical and clinical activities are
susceptible to varying interpretations which could delay, limit or prevent
regulatory approval or clearance. In addition, delays or rejections may be
encountered based upon changes in regulatory policy during the period of product
development and/or the period of review of any application for regulatory
approval or clearance for a product. Delays in obtaining regulatory approvals or
clearances would adversely affect the marketing of any products developed by the
Company or its corporate partners, impose significant additional costs on the
Company and its corporate partners, diminish any competitive advantages that the
Company or its corporate partners may attain and adversely affect the Company's
ability to receive royalties and generate revenues and profits. There can be no
assurance that, even after such time and expenditures, any required regulatory
approvals or clearances will be obtained for any products developed by or in
collaboration with the Company.
 
     Regulatory approval, if granted, may entail limitations on the indicated
uses for which the new product may be marketed that could limit the potential
market for such product, and product approvals, once granted, may be withdrawn
if problems occur after initial marketing. Furthermore, manufacturers of
approved products are subject to pervasive review, including compliance with
detailed regulations governing GMP. Failure to comply with applicable regulatory
requirements can result in, among other things, warning letters, fines,
injunctions, civil penalties, recall or seizure of products, total or partial
suspension of production, refusal of the government to renew marketing
applications and criminal prosecution.
 
     The Company is also subject to numerous federal, state and local laws,
regulations and recommendations relating to safe working conditions, laboratory
and manufacturing practices, the experimental use of animals, the environment
and the use and disposal of hazardous substances, used in connection with the
Company's discovery, research and development work, including radioactive
compounds and infectious disease agents. In addition, the Company cannot predict
the extent of government regulations or the impact of new governmental
regulations which might have an adverse effect on the discovery, development,
production and marketing of the Company's products, and there can be no
assurance that the Company will not be required to incur significant costs to
comply with current or future laws or regulations or that the Company will not
be adversely affected by the cost of such compliance. See
"Business -- Government Regulation."
 
PRODUCT LIABILITY EXPOSURE AND POTENTIAL UNAVAILABILITY OF INSURANCE
 
     Inherent in the use of the Company's product candidates in clinical trials,
as well as in the manufacturing and distribution of any approved products, is
the risk of financial exposure to product liability claims in the event that the
use of such products results in personal injury. There can be no assurance that
the Company will not experience losses due to product liability claims in the
future. Corixa has obtained limited product liability insurance coverage;
however, there can be no assurance that such coverage is adequate or will
continue to be available in sufficient amounts or at an acceptable cost, or at
all. There can also be no assurance that the Company will be able to obtain
commercially reasonable product liability insurance for any product approved for
marketing. A product liability claim, product recall or other claim, as well as
any claims for uninsured liabilities or in excess of insured liabilities, may
have a material adverse effect on the Company's business, financial condition
and results of operations.
 
                                       13
<PAGE>   15
 
NO ASSURANCE OF MARKET ACCEPTANCE
 
     There can be no assurance that any products successfully developed by the
Company or its corporate partners, if approved for marketing, will ever achieve
market acceptance. The Company's products, if successfully developed, will
compete with a number of traditional drugs and therapies manufactured and
marketed by major pharmaceutical and other biotechnology companies, as well as
new products currently under development by such companies and others. The
degree of market acceptance of any products developed by the Company or its
corporate partners will depend on a number of factors, including the
establishment and demonstration of the clinical efficacy and safety of the
product candidates, their potential advantage over alternative treatment methods
and reimbursement policies of government and third-party payors. There can be no
assurance that physicians, patients or the medical community in general will
accept and utilize any products that may be developed by the Company or its
corporate partners, and the lack of such market acceptance would have a material
adverse effect on the Company's business, financial condition and results of
operations.
 
UNCERTAINTY RELATED TO PRICING AND REIMBURSEMENT; UNCERTAINTY RELATED TO HEALTH
CARE REFORM
 
     In both domestic and foreign markets, sales of the Company's or its
corporate partners' products, if any, will depend in part on the availability of
reimbursement from third-party payors such as government health administration
authorities, private health insurers, health maintenance organizations, pharmacy
benefit management companies and other organizations. Both the federal and state
governments in the United States and foreign governments continue to propose and
pass legislation designed to contain or reduce the cost of health care, and
regulations affecting the pricing of pharmaceuticals and other medical products
may change or be adopted before any of the Company's or its corporate partners'
products are approved for marketing. Cost control initiatives could decrease the
price that the Company receives for any product it or any of its corporate
partners may develop in the future and may have a material adverse effect on the
Company's business, financial condition and results of operations. In addition,
third-party payors are increasingly challenging the price and cost-effectiveness
of medical products and services. Significant uncertainty exists as to the
reimbursement status of newly approved health care products, including
pharmaceuticals. There can be no assurance that the Company's or its corporate
partners' products, if any, will be considered cost effective or that adequate
third-party reimbursement will be available to enable Corixa or its corporate
partners to maintain price levels sufficient to realize a return on their
investment. In any such event, the Company may be materially adversely affected.
 
NO PRIOR PUBLIC MARKET; POSSIBLE VOLATILITY OF STOCK PRICE
 
     Prior to the Offering, there has been no public market for the Common Stock
of the Company, and there can be no assurance that an active trading market for
the Common Stock will develop or be sustained upon completion of the Offering.
The initial public offering price of the Common Stock will be determined by
negotiations between the Company and the representatives of the Underwriters.
The primary factors considered in determining such initial public offering
price, in addition to prevailing market conditions, will be the Company's
historical performance and capital structure, estimates of business potential
and earnings prospects of the Company, an assessment of the Company, an
assessment of the Company's management and the consideration of the above
factors in relation to market valuation of companies in related businesses. The
securities markets have, from time to time, experienced significant price and
volume fluctuations that may be unrelated to the operating performance of
particular companies. These fluctuations often substantially affect the market
price of a company's common stock. The market prices for securities of
biotechnology companies have in the past been, and can in the future be expected
to be, especially volatile. The market price of the Company's Common Stock may
be subject to substantial volatility depending upon many factors, including
announcements regarding the results of discovery efforts, preclinical and
clinical activities, technological innovations or new commercial products
developed by the Company or its competitors, changes in government regulations,
changes in the Company's patent portfolio, developments or disputes concerning
proprietary rights, changes in existing corporate partnerships or licensing
arrangements, the establishment of additional corporate partnerships or
licensing arrangements, the progress of regulatory approvals, the issuance of
new or
 
                                       14
<PAGE>   16
 
changed stock market analyst reports and/or recommendations, and economic and
other external factors, as well as operating losses by the Company, fluctuations
in the Company's financial results and the degree of trading liquidity in the
Common Stock. These factors could have a material adverse effect on the
Company's business, financial condition and results of operations and the price
of the Common Stock in the public market. See "Management's Discussion and
Analysis of Financial Condition and Results of Operations" and "Underwriting."
 
CONTROL BY EXISTING STOCKHOLDERS
 
     Following the completion of the Offering, executive officers and directors
of the Company, together with entities affiliated with them, will beneficially
own approximately 57.2% of the Common Stock of the Company (approximately 55.2%
if the Underwriters' over-allotment option is exercised in full). These
stockholders, acting as a group, will continue to be able to control the
election of all members of the Company's Board of Directors and to determine all
corporate actions after the Offering. The voting power of these stockholders
could also have the effect of delaying or preventing a change in control of the
Company. See "Principal Stockholders" and "Description of Capital Stock."
 
SHARES ELIGIBLE FOR FUTURE SALE
 
     Sales of a substantial number of shares of Common Stock (including shares
issued upon the exercise of outstanding options and warrants) in the public
market following the Offering could adversely affect the market price for the
Common Stock. Such sales could also make it more difficult for the Company to
sell its equity or equity-related securities in the future at a time and price
that the Company deems appropriate. Upon completion of the Offering and based on
the shares outstanding as of June 30, 1997, the Company will have outstanding an
aggregate of 10,994,331 shares of Common Stock, assuming (i) the issuance of
445,139 shares of Common Stock upon the net exercise of outstanding warrants
expected to be exercised upon the closing of the Offering, (ii) no exercise of
warrants for 694,512 shares of Common Stock expected to remain outstanding after
the closing of the Offering and (iii) no exercise of options after June 30,
1997. Of these outstanding shares of Common Stock, the 2,750,000 shares sold in
the Offering will be freely tradable without restriction or further registration
under the Securities Act of 1933, as amended (the "Securities Act"), by persons
other than "affiliates" of the Company, as defined in Rule 144 under the
Securities Act. The remaining 8,244,331 shares of Common Stock outstanding upon
completion of the Offering and held by existing stockholders will be "restricted
securities" as that term is defined by Rule 144 and Rule 701 under the
Securities Act ("Restricted Shares"). Sales of Restricted Shares in the public
market, or the availability of such shares for sale, could adversely affect the
market price of the Common Stock. The holders of 8,051,548 Restricted Shares,
including all officers and directors of the Company, are subject to "lock-up"
agreements with the Underwriters and/or the Company providing that they will not
offer, sell, contract to sell or grant any option to purchase or otherwise
dispose of the shares of Common Stock owned by them or that could be purchased
by them through the exercise of options to purchase Common Stock of the Company
for a period of 180 days after the effectiveness of the registration statement,
of which this Prospectus is a part (the "Registration Statement"), without the
prior written consent of Lehman Brothers Inc. on behalf of the Underwriters
and/or the Company, as applicable. The Company has agreed with the
representatives of the Underwriters not to release any holders from such
agreements without the prior written consent of Lehman Brothers Inc. on behalf
of the Underwriters. Such lock-up agreements may be released at any time as to
all or any portion of the shares subject to such agreements at the sole
discretion of Lehman Brothers Inc. Of the 8,051,548 shares of Common Stock that
will first become eligible for sale in the public market 180 days after the
effectiveness of the Registration Statement, 1,522,149 shares will be
immediately eligible for sale without restriction under Rule 144(k) or Rule 701
under the Securities Act and 6,524,854 shares will be immediately eligible for
sale subject to certain volume and other restrictions pursuant to Rule 144. As
of 180 days after the effectiveness of the Registration Statement, 163,357
shares of Common Stock will remain subject to the Company's right of repurchase
pursuant to stock purchase agreements and therefore will not be available for
sale under Rule 144 until such right of repurchase lapses. Beginning immediately
after the closing of the Offering, 12,593 shares will be available for sale
under Rule 144 upon the exercise of outstanding warrants, and beginning 180 days
after the closing of the Offering, 681,919 shares will be available for sale
under Rule 144 upon the exercise of outstanding warrants. Shortly after the
effectiveness of the Offering, the Company
 
                                       15
<PAGE>   17
 
intends to register 2,218,653 shares of Common Stock reserved for issuance under
its stock option and stock purchase plans or currently subject to outstanding
options. In addition, holders of 7,925,862 shares of Common Stock and the
holders of warrants to purchase 694,512 shares of Common Stock may require the
Company to register their shares of Common Stock under the Securities Act, which
would permit such holders to resell a certain number of their shares without
complying with Rule 144. If such holders, by exercising their demand or
piggyback registration rights, cause a large number of securities to be
registered and sold in the public market, such sales could have a material
adverse effect on the market price for the Common Stock. If the Company were to
include in a Company-initiated registration shares held by such holders pursuant
to the exercise of their piggyback registration rights, such sales could have a
material adverse effect on the Company's ability to raise needed capital. See
"Shares Eligible for Future Sale" and "Description of Capital
Stock -- Registration Rights of Certain Holders."
 
EFFECT OF CERTAIN CHARTER AND BYLAW PROVISIONS
 
     Certain provisions of the Company's Restated Certificate of Incorporation
and Bylaws may have the effect of making it more difficult for a third party to
acquire, or of discouraging a third party from attempting to acquire, control of
the Company. Such provisions could limit the price that certain investors might
be willing to pay in the future for shares of the Company's Common Stock.
Certain of these provisions allow the Company to issue up to 10,000,000 shares
of Preferred Stock and fix the rights and preferences thereof without any vote
or further action by the stockholders, eliminate the right of stockholders to
act by written consent without a meeting and eliminate cumulative voting in the
election of directors. The rights of holders of Common Stock will be subject to,
and may be adversely affected by, the rights of holders of any Preferred Stock
that may be issued in the future. These provisions may make it more difficult
for stockholders to take certain corporate actions and could have the effect of
delaying or preventing a change in control of the Company. Certain provisions of
Delaware law and Washington law applicable to the Company could also delay or
make more difficult a merger, tender offer or proxy contest involving the
Company. Such provisions include Section 203 of the Delaware General Corporation
Law, which prohibits a Delaware corporation from engaging in any business
combination with any interested stockholder for a period of three years unless
certain conditions are met, and Chapter 23B.19 of the Washington Business
Corporation Act, which prohibits a corporation operating in Washington from
engaging in certain significant business transactions with a person or group of
persons who beneficially own 10% of the voting securities of such corporation
for a period of five years unless certain conditions are met. After the
five-year period, such significant business transaction must still comply with
certain fair price provisions of such statute. See "Management" and "Description
of Capital Stock -- Anti-Takeover Effects of Delaware and Washington Law."
 
BROAD MANAGEMENT DISCRETION IN USE OF PROCEEDS
 
     The principal purposes of the Offering are to obtain additional capital,
create a public market for the Company's Common Stock and facilitate future
access by the Company to public equity markets. As of the date of this
Prospectus, the Company plans to spend approximately $29.0 million for research
and development expenses through the end of fiscal year 1998. A portion of the
net proceeds of the Offering will support such research and development efforts.
The Company currently expects to use the remainder of the net proceeds from the
Offering for working capital and general corporate purposes. A portion of the
proceeds may also be used to acquire or invest in complementary businesses or
products or to obtain the right to use complementary technologies; however,
there are no plans, negotiations or discussions with respect to any such
transactions at the present time. Pending use of the net proceeds for the above
purposes, the Company intends to invest such funds in short-term
interest-bearing government and other investment grade securities. Accordingly,
the Company's management will retain broad discretion as to the allocation of
the net proceeds from the Offering and subject to certain exceptions will be
able to use and allocate such net proceeds without first obtaining stockholder
approval.
 
                                       16
<PAGE>   18
 
ABSENCE OF DIVIDENDS
 
     The Company has not declared or paid dividends on its Common Stock since
its inception and does not anticipate declaring or paying cash dividends to its
stockholders in the foreseeable future. See "Dividend Policy."
 
DILUTION
 
     Purchasers of the Common Stock offered hereby will experience immediate and
substantial dilution of $8.97 in the pro forma net tangible book value per share
of Common Stock from the initial offering price set forth on the cover of this
Prospectus. Substantial additional dilution will occur upon exercise of
outstanding options and warrants to purchase the Common Stock. See "Dilution."
Additionally, in the event SmithKline Beecham elects to exercise either one of
its options to license Corixa's early-stage antigen discovery programs in
cancer, the Company may be required to issue shares of its Common Stock to
SmithKline Beecham, and additional dilution will occur as a result of any such
issuance. See "Business -- Corporate Partnerships -- Vaccines." Dilution will
also occur in the event the Company elects to exercise its right to purchase a
significant majority of the outstanding shares of GenQuest, Inc.'s capital
stock. See "Business -- Relationship with GenQuest, Inc."
 
               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS
 
     Certain statements contained or incorporated by reference in this
Prospectus, including without limitation, statements containing the words
"believes," "anticipates," "expects" and words of similar import, constitute
"forward-looking statements." Such forward-looking statements involve known and
unknown risks, uncertainties and other factors which may cause the actual
results, performance or achievements of Corixa or its corporate partners, or
industry results, to be materially different from any future results,
performance or achievements expressed or implied by such forward-looking
statements. Such factors include, among others, the following: uncertainties
related to the early stage of the Company's research and development programs;
uncertainties related to the effectiveness of the Company's technology and the
development of its products; dependence on and management of existing and future
corporate partnerships; dependence on in-licensed technology; dependence on
proprietary technology and uncertainty of patent protection; management of
growth; history of operating losses; future capital needs and uncertainty of
additional funding; dependence on key personnel; intense competition; the
Company's lack of manufacturing and marketing experience and reliance on third
parties to perform such functions; existing government regulations and changes
in, or the failure to comply with, government regulations; and other factors
referenced in this Prospectus. Certain of these factors are discussed in more
detail elsewhere in this Prospectus, including, without limitation, under the
captions "Prospectus Summary," "Risk Factors," "Management's Discussion and
Analysis of Financial Condition and Results of Operations" and "Business." Given
these uncertainties, prospective investors are cautioned not to place undue
reliance on such forward-looking statements. Corixa disclaims any obligation to
update any such factors or to publicly announce the result of any revisions to
any of the forward-looking statements contained herein to reflect future events
or developments.
 
                                       17
<PAGE>   19
 
                                USE OF PROCEEDS
 
     The net proceeds to the Company from the sale of the 2,750,000 shares of
Common Stock offered hereby are estimated to be $32,447,500 ($37,434,625 if the
Underwriters' over-allotment option is exercised in full), after deducting
underwriting discounts and commissions and estimated Offering expenses. The
principal purposes of the Offering are to obtain additional capital, create a
public market for the Company's Common Stock and facilitate future access by the
Company to public equity markets. The Company currently believes that it will
spend approximately $29.0 million for research and development expenses through
the end of fiscal 1998, approximately $15.0 million of which will be from the
net proceeds of the Offering and approximately $14.0 million of which will be
from committed payments under the Company's existing collaborative agreements
and licensing arrangements (assuming no additional funding from such existing
agreements and arrangements and no new collaborative agreements or licensing
arrangements are executed). The Company currently expects to use the remainder
of the net proceeds for working capital and general corporate purposes. The
Company may also use a portion of such net proceeds to acquire or invest in
businesses, products and technologies that are complementary to those of the
Company, although no such acquisitions are planned or negotiated as of the date
of this Prospectus, and no portion of the net proceeds has been allocated for
any specific acquisition. Pending such uses, the net proceeds will be invested
in short-term, interest-bearing, government and other investment grade
securities. The Company believes that the net proceeds from the Offering, its
existing capital resources, committed payments under its existing collaborative
agreements and licensing arrangements, equipment financing and interest income
will be sufficient to fund its current and planned operations for at least 18
months following the Offering.
 
     The amounts actually expended for each purpose may vary significantly
depending upon numerous factors, including progress of the Company's discovery,
research and development programs, the number and breadth of these programs,
achievement of milestones under corporate partnerships and licensing
arrangements, the ability of the Company to establish and maintain corporate
partnerships and other licensing arrangements and the progress of the
development efforts of the Company's corporate partners. Such factors also
include the pace and amount of any acquisitions or investments, competing
technological and market developments that make the Company's technologies and
products relatively less attractive to corporate partners, the costs involved in
enforcing patent claims and other intellectual property rights and the costs and
timing of obtaining necessary regulatory approvals.
 
                                DIVIDEND POLICY
 
     The Company has never declared or paid cash dividends on its capital stock
and does not anticipate paying cash dividends in the foreseeable future.
 
                                       18
<PAGE>   20
 
                                 CAPITALIZATION
 
     The following table sets forth as of June 30, 1997: (a) the actual
capitalization of the Company; (b) the pro forma capitalization of the Company,
giving effect to the automatic conversion of all outstanding shares of the
Company's Preferred Stock into Common Stock and the filing of the Company's
Restated Certificate of Incorporation to authorize 40,000,000 shares of Common
Stock at a par value of $0.001 per share and 10,000,000 shares of Preferred
Stock at a par value of $0.001 per share upon the closing of the Offering; and
(c) the pro forma capitalization as adjusted to reflect (i) the sale of the
2,750,000 shares of Common Stock offered hereby at an assumed initial public
offering price of $13.00 per share after deducting underwriting discounts and
commissions and estimated Offering expenses and (ii) the issuance of 445,139
shares of Common Stock upon the net exercise of outstanding warrants upon the
closing of the Offering. This table should be read in conjunction with
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" and the Financial Statements and related Notes thereto included
elsewhere in this Prospectus.
 
<TABLE>
<CAPTION>
                                                                         JUNE 30, 1997
                                                             -------------------------------------
                                                                                        PRO FORMA
                                                             ACTUAL      PRO FORMA     AS ADJUSTED
                                                             -------     ---------     -----------
                                                             (IN THOUSANDS)
<S>                                                          <C>         <C>           <C>
Long-term obligations, less current portion................  $ 5,086      $ 5,086        $ 5,086
Stockholders' equity (1):
  Preferred Stock, $0.001 par value; 23,100,000 shares
     authorized, 5,151,181 shares issued and outstanding,
     actual; 10,000,000 shares authorized, none issued and
     outstanding, pro forma and pro forma as adjusted......        5           --             --
  Common Stock, $0.001 par value; 40,000,000 shares
     authorized, 2,648,011 issued and outstanding, actual;
     7,799,192 issued and outstanding, pro forma;
     10,994,331 issued and outstanding, pro forma as
     adjusted..............................................        3            8             11
  Additional paid-in capital...............................   25,624       25,624         58,069
  Receivable for warrants..................................     (932)        (932)          (932)
  Deferred compensation....................................   (3,533)      (3,533)        (3,533)
  Deficit accumulated during development stage.............   (9,295)      (9,295)        (9,295)
                                                             -------      -------        -------
     Total stockholders' equity............................   11,872       11,872         44,320
                                                             -------      -------        -------
     Total capitalization..................................  $16,958      $16,958        $49,406
                                                             =======      =======        =======
</TABLE>
 
- ---------------
 
(1) Excludes (i) 1,187,614 shares of Common Stock issuable upon exercise of
    stock options outstanding as of June 30, 1997, 378,334 of which are fully
    vested, at a weighted average exercise price of $0.71 per share, (ii)
    694,512 shares of Common Stock issuable upon exercise of warrants expected
    to remain outstanding after the Offering at a weighted average exercise
    price of $8.04 per share, (iii) with respect to the actual and pro forma
    capitalization, 445,139 shares of Common Stock issued upon the net exercise
    of outstanding warrants upon the closing of the Offering, (iv) an aggregate
    of 1,031,039 shares reserved for future issuance under the 1994 Plan, the
    Purchase Plan and the Directors' Plan and (v) 3,029 shares of Common Stock
    issued after June 30, 1997 in connection with a collaboration agreement. See
    "Management -- Stock Option Plans" and "Description of Capital Stock."
 
                                       19
<PAGE>   21
 
                                    DILUTION
 
     The pro forma net tangible book value of the Company at June 30, 1997 was
approximately $11,872,068, or $1.52 per share (after giving effect to the
conversion of all outstanding shares of Preferred Stock into Common Stock). Pro
forma net tangible book value per share is equal to net tangible assets
(tangible assets of the Company less total liabilities) divided by the number of
shares of Common Stock outstanding as of June 30, 1997 (after giving effect to
the conversion of all outstanding shares of Preferred Stock into Common Stock).
Pro forma net tangible book value dilution per share represents the difference
between the amount per share paid by purchasers of Common Stock in the Offering
and the pro forma net tangible book value per share of Common Stock immediately
after the completion of the Offering. After giving effect to the sale of the
2,750,000 shares of Common Stock offered by the Company at an assumed initial
public offering price of $13.00 per share, the receipt of net proceeds
therefrom, and the issuance of 445,139 shares of Common Stock upon the net
exercise of outstanding warrants upon the closing of the Offering, the pro forma
net tangible book value of the Company as of June 30, 1997 would have been
$44,319,568, or $4.03 per share. This represents an immediate increase in pro
forma net tangible book value of $2.51 per share to existing stockholders and an
immediate dilution in pro forma net tangible book value of $8.97 per share to
new investors purchasing shares of Common Stock in the Offering. The following
table illustrates this per share dilution as of June 30, 1997:
 
<TABLE>
        <S>                                                           <C>       <C>
        Assumed initial public offering price.......................            $ 13.00
          Pro forma net tangible book value before the Offering.....  $ 1.52
          Increase per share attributable to new investors..........    2.51
                                                                       -----
        Pro forma net tangible book value after the Offering........               4.03
                                                                                  -----
        Dilution in pro forma net tangible book value to new
          investors.................................................            $  8.97
                                                                                  =====
</TABLE>
 
     The following table sets forth, on a pro forma basis as of June 30, 1997
after giving effect to the conversion of all outstanding shares of Preferred
Stock into Common Stock and the net exercise of outstanding warrants expected to
be exercised upon the closing of the Offering, the difference between the
existing stockholders and the purchasers of shares in the Offering at an assumed
initial public offering price of $13.00 per share (before deducting underwriting
discounts and commissions and estimated Offering expenses) with respect to the
number of shares purchased from the Company, the total cash consideration paid
and the average price per share paid:
 
<TABLE>
<CAPTION>
                                        SHARES PURCHASED          TOTAL CONSIDERATION
                                     ----------------------     -----------------------     AVERAGE PRICE
                                       NUMBER       PERCENT        AMOUNT       PERCENT       PER SHARE
                                     -----------    -------     ------------    -------     -------------
<S>                                  <C>            <C>         <C>             <C>         <C>
Existing stockholders...............   8,244,331      75.0%     $ 20,425,793      36.4%        $  2.48
New stockholders....................   2,750,000      25.0        35,750,000      63.6           13.00
                                      ----------     -----        ----------     -----
          Total.....................  10,994,331     100.0%     $ 56,175,793     100.0%
                                      ==========     =====        ==========     =====
</TABLE>
 
     The foregoing computations exclude 1,187,614 shares of Common Stock
issuable upon exercise of stock options outstanding as of June 30, 1997 under
the 1994 Plan, 378,334 of which were fully vested, at a weighted average price
of $0.71 per share and 694,512 shares of Common Stock issuable upon exercise of
warrants expected to remain outstanding after the Offering at a weighted average
exercise price of $8.04 per share. In addition, there are currently an aggregate
of 1,031,039 shares of Common Stock reserved for future issuance under the 1994
Plan, the Purchase Plan and the Directors' Plan. See "Management -- Stock Plans"
and "Description of Capital Stock."
 
                                       20
<PAGE>   22
 
                            SELECTED FINANCIAL DATA
 
     The selected financial data set forth below with respect to the Company's
statement of operations data for each of the two years ended December 31, 1996,
and the period from September 8, 1994 (date of inception) to December 31, 1994
(the "Inception Period") and the balance sheet data at December 31, 1995 and
1996 are derived from the financial statements of the Company, which have been
audited by KPMG Peat Marwick LLP or Ernst & Young LLP, independent accountants
and auditors, and which are included elsewhere herein and are qualified by
reference to such Financial Statements and Notes relating thereto. The selected
financial data with respect to the balance sheet at December 31, 1994 is derived
from financial statements audited by KPMG Peat Marwick LLP which are not
included herein. The financial data for the six month periods ended June 30,
1996 and 1997 and the period from September 8, 1994 (date of inception) to June
30, 1997 are derived from unaudited financial statements which are included
elsewhere herein. The unaudited financial statements include all adjustments,
consisting of normal recurring accruals, which the Company considers necessary
for a fair presentation of the financial position and the results of operations
for these periods. Operating results for the six months ended June 30, 1997 are
not necessarily indicative of the results that may be expected for the entire
year ending December 31, 1997. The financial data is qualified in its entirety
by, and the data should be read in conjunction with, Management's Discussion and
Analysis of Financial Condition and Results of Operations and the Financial
Statements, including the related Notes thereto, included elsewhere herein.
 
   
<TABLE>
<CAPTION>
                                         INCEPTION            YEAR ENDED           SIX MONTHS ENDED
                                    (SEPTEMBER 8, 1994)      DECEMBER 31,              JUNE 30,        INCEPTION TO
                                      TO DECEMBER 31,     -------------------     ------------------     JUNE 30,
                                           1994            1995        1996        1996        1997        1997
                                    -------------------   -------     -------     -------     ------   ------------
                                                         (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                 <C>                   <C>         <C>         <C>         <C>      <C>
STATEMENTS OF OPERATIONS DATA:
Revenues:
  Collaborative agreements.........       $    --         $ 2,411     $ 4,402     $ 1,731     $6,939     $ 13,752
  Government grants................            --             304       1,403         626        554        2,261
                                          -------         -------     -------     -------     -------    --------
         Total revenues............            --           2,715       5,805       2,357      7,493       16,013
Operating expenses:
  Research and development(1)......           867           7,040       9,995       4,708      7,104       25,006
  General and administrative.......           205             532         781         438        779        2,297
                                          -------         -------     -------     -------     -------    --------
         Total operating
           expenses................         1,072           7,572      10,776       5,146      7,883       27,303
Income (loss) from operations......        (1,072)         (4,857)     (4,971)     (2,789)      (390)     (11,290)
Interest income, net...............            83             691         476         213        235        1,485
Other income(2)....................            --              16         348         174        187          551
                                          -------         -------     -------     -------     -------    --------
Net income (loss)..................       $  (989)        $(4,150)    $(4,147)    $(2,402)    $   32     $ (9,254)
                                          =======         =======     =======     =======     =======    ========
Pro forma net income (loss) per
  share(3).........................                                   $ (0.50)                $ 0.00
                                                                      =======                 =======
Shares used in computing pro forma
  net income (loss) per share(3)...                                     8,343                  8,536
                                                                      =======                 =======
</TABLE>
    
 
<TABLE>
<CAPTION>
                                                                       DECEMBER 31,                  JUNE
                                                             ---------------------------------        30,
                                                              1994         1995         1996         1997
                                                             -------      -------      -------      -------
                                                                             (IN THOUSANDS)
<S>                                                          <C>          <C>          <C>          <C>
BALANCE SHEET DATA:
Cash, cash equivalents and securities available-for-sale.... $11,064      $10,773      $11,933      $15,047
Working capital.............................................  10,939        9,743       10,101       12,798
Total assets................................................  14,334       12,340       15,185       20,030
Long-term obligations, less current portion.................      --          816        1,175        5,086
Deficit accumulated during development stage................    (989)      (5,126)      (9,298)      (9,295)
Total stockholders' equity..................................  14,038       10,264       11,225       11,872
</TABLE>
 
- ---------------
 
(1) Included in research and development expenses for the Inception Period is
    $428,059 related to the purchase of in-process research and development.
 
(2) Other income includes proceeds received for management and administrative
    services.
 
(3) See Note 1 of Notes to Financial Statements for information regarding the
    computation of pro forma net income (loss) per share.
 
                                       21
<PAGE>   23
 
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
     This discussion and analysis contains certain forward-looking statements
relating to future events or the future financial performance of the Company.
Such statements are only predictions and the actual events or results may differ
materially from the results discussed in the forward-looking statements. Factors
that could cause or contribute to such differences include, but are not limited
to, those discussed in "Risk Factors" as well as those discussed elsewhere in
this Prospectus. The historical results set forth in this discussion and
analysis are not necessarily indicative of trends with respect to any actual or
projected future financial performance of the Company. This discussion and
analysis should be read in conjunction with the Financial Statements and the
related Notes thereto included elsewhere in this Prospectus. See "Special Note
Regarding Forward-Looking Statements."
 
OVERVIEW
 
   
     Corixa's objective is to be the leader in the discovery and
commercialization of T cell vaccine products for the treatment and prevention of
cancers and certain infectious diseases. The Company's strategy is to dedicate
its resources to vaccine discovery and to establish corporate collaborations as
early in the development process as possible for all aspects of product
development and commercialization, including research, clinical development,
obtaining regulatory approval, manufacturing and marketing. Corixa believes that
this research- and partner-driven approach creates significant scientific,
operational and financial advantages for the Company and accelerates the
commercial development of new therapeutic and prophylactic T cell vaccines. To
date, approximately 86% of the Company's revenue has resulted from payments from
such collaborative agreements. In particular, the Company has entered into
significant corporate partnerships with SmithKline Beecham with respect to
tuberculosis and cancer vaccine products pursuant to which the Company will
receive up to an aggregate of $65.3 million, of which up to $23 million is
payable under the breast cancer collaboration, up to $23 million is payable
under the prostate cancer collaboration and up to $19.3 million is payable under
the tuberculosis collaboration. A substantial amount of such funding is required
to be used for research and development activities pursuant to the terms of such
collaborations. SmithKline Beecham may terminate either or both of the breast
and prostate cancer programs in the event the Company does not meet certain
scientific milestones after the second anniversary of the effective date of the
respective agreements and may terminate the tuberculosis agreement by failing to
exercise the option thereunder. See "Business -- Corporate Partnerships --
Vaccines." Additionally, approximately 14% of the Company's revenue has resulted
from funds awarded through government grants. As of June 30, 1997, the Company
had total stockholders' equity of $11.9 million.
    
 
     Corixa has entered, and intends to continue to enter, into collaborative
agreements as early in the vaccine development stage as possible. The Company
believes that this active corporate partnering strategy enables Corixa to
maintain its focus on its fundamental strengths in vaccine discovery and
research, capitalizes on its corporate partners' strengths in product
development, manufacturing and commercialization, and significantly diminishes
the Company's financing requirements. When entering into such corporate
partnering relationships, the Company seeks to cover its research and
development expenses through research funding, milestone payments and option,
technology or license fees, while retaining significant downstream participation
in product sales through either profit-sharing or product royalties paid on
annual net sales. Revenues recognized from inception through June 30, 1997 under
the Company's collaborative agreements were approximately $13.8 million.
 
     The Company has experienced significant operating losses in each year since
its inception. As of June 30, 1997, the Company's accumulated deficit was
approximately $9.3 million. The Company may incur substantial additional
operating losses over at least the next several years. Such losses have been and
may continue to be principally the result of the various costs associated with
the Company's discovery, research and development programs, and preclinical and
clinical activities. Substantially all of the Company's revenues to date have
resulted from corporate partnerships, other research, development and licensing
arrangements, research grants and interest income. The Company's ability to
achieve a consistent, profitable level of operations is dependent in large part
upon entering into collaborative agreements with corporate partners for product
discovery, research, development and commercialization, obtaining regulatory
approvals for its
 
                                       22
<PAGE>   24
 
products and successfully manufacturing and marketing commercial products. There
can be no assurance that the Company will be able to achieve consistent
profitability. In addition, payments under collaborative agreements and
licensing arrangements will be subject to significant fluctuations in both
timing and amounts, resulting in quarters of profitability and quarters of
losses by the Company. Therefore, the Company's results of operations for any
period may fluctuate and may not be comparable to the results of operations for
any other period.
 
RESULTS OF OPERATIONS
 
  Six Months Ended June 30, 1997 and 1996
 
     Total Revenues
 
   
     Revenues increased to $7.5 million for the six months ended June 30, 1997,
from $2.4 million for the same period in 1996. This increase was attributable
primarily to license revenues resulting from the agreements with SmithKline
Beecham. Revenue of approximately $831,000 was recognized during the six months
ended June 30, 1997 in conjunction with the collaboration agreement with
GenQuest. Revenue under government grants received in 1997 is expected to be
slightly less than that received in 1996.
    
 
     Research and Development Expenses
 
   
     Research and development expenses increased to $7.1 million for the six
months ended June 30, 1997, from $4.7 million for the same period in 1996. The
increase was primarily attributable to increased payroll and personnel expenses
incurred as the Company hired additional research and development personnel,
increased purchase of laboratory supplies, increased equipment depreciation and
facilities expenses in connection with the expansion of the Company's research
efforts, and the inclusion of the research and development portion of amortized
deferred compensation expense associated with the grant of certain stock
options. This non-cash compensation expense will continue to be recognized over
the vesting period of such options, typically four years. See Note 1 of Notes to
Financial Statements. Research and development expenses of approximately $1.0
million were incurred during the six months ended June 30, 1997 in conjunction
with the GenQuest collaboration agreement. The Company expects research and
development expenses to increase in the future to support the expansion of its
research and development activities.
    
 
   
     The Company and GenQuest have entered into a call option agreement under
which the Company has the right to purchase a significant majority of the
outstanding capital stock of GenQuest in exchange for shares of the Company's
Common Stock at a purchase price determined in accordance with a formula
specified in the call option agreement. The Company has not made a decision as
to whether it will exercise the option. If the Company were to exercise the
option, the Company would be required to fund any future development efforts of
GenQuest which would result in the Company incurring research and development
expenses without the corresponding revenue currently provided by GenQuest.
    
 
     General and Administrative Expenses
 
     General and administrative expenses increased to $779,000 for the six
months ended June 30, 1997, from $438,000 for the same period in 1996. The
increase was primarily due to increased expenses related to business development
and the general and administrative portions of the amortized deferred
compensation expense associated with the grant of certain stock options. See
Note 1 of Notes to Financial Statements. The Company expects general and
administrative expenses to increase in the future to support the expansion of
its business development activities, and increased expenses associated with
being a public company.
 
     Interest Income, Net
 
     Interest income, net increased to $235,000 for the six months ended June
30, 1997, from $213,000 for the same period in 1996. This increase was due to an
increase in interest income resulting from higher average cash balances in the
first six months of 1997 which was partially offset by an increase in interest
expense resulting from higher capital lease balances outstanding in 1996. The
Company expects interest income, net to increase in 1997 due to an increase in
average cash balances as a result of the consummation of the Offering.
 
                                       23
<PAGE>   25
 
     Other Income
 
     Other income increased to $187,000 for the six months ended June 30, 1997,
from $174,000 for the same period in 1996. The 1997 balance consists of $162,500
and $24,000 in proceeds from management and administrative services agreements
with GenQuest and the Infectious Disease Research Institute ("IDRI"), a
not-for-profit, grant-funded private research institute, respectively, pursuant
to which the Company provides services with respect to corporate management,
accounting and financial matters, recordkeeping, personnel administration and
human resources, and treasury services as required by such agreements.
 
     Deferred Compensation
 
     Deferred compensation of approximately $3.9 million was recorded in the six
months ended June 30, 1997, representing the difference between the exercise
prices of 645,004 shares of Common Stock subject to options granted during the
six months ended June 30, 1997 and the deemed fair value of the Company's Common
Stock on the grant dates. Deferred compensation expense of $371,210 attributed
to the shares was amortized during the six months ended June 30, 1997. The
remaining deferred compensation will be amortized to operating expense over the
vesting periods of the options.
 
  Years Ended December 31, 1996, 1995 and Inception Period
 
     Revenues
 
     Revenues increased to $5.8 million in 1996, from $2.7 million in 1995. This
increase was attributable primarily to increased collaborative agreement
funding. Revenue under collaborative agreements increased to $4.4 million in
1996, from $2.4 million in 1995. Funds received from government grants increased
to $1.4 million in 1996, from $304,000 in 1995, and revenue under government
grants received in 1997 is expected to be slightly less than that received in
1996. The Company did not recognize any revenue during the Inception Period.
 
     Research and Development Expenses
 
     The Company's research and development expenses increased to $10.0 million
in 1996, from $7.0 million in 1995, and $867,000 in the Inception Period
(approximately $428,000 of which resulted from acquired in-process research and
development). The increases were primarily due to greater expenses associated
with additional personnel hired to support the Company's growing research
efforts and related purchases of research materials and laboratory supplies.
 
     General and Administrative Expenses
 
     The Company's general and administrative expenses increased to $781,000 in
1996, from $532,000 in 1995, and from $205,000 in the Inception Period. Such
expenses increased as a result of the increase in compensation and benefits paid
relating to the hiring of additional personnel.
 
     Interest Income, Net
 
     Interest income, net decreased to $476,000 in 1996, from $691,000 in 1995.
This decrease was due to higher outstanding capital lease balances in 1996
resulting in greater interest expense. Interest income, net was $83,000 in the
Inception Period.
 
     Other Income
 
     Other income increased to $348,000 in 1996, from $16,000 in 1995 due to
proceeds of $300,000 and $48,000 from management and administration agreements
with GenQuest and IDRI, respectively, pursuant to which the Company provides
services with respect to corporate management, accounting and financial matters,
recordkeeping, personnel administration and human resources, and treasury
services as required by such agreements. No other income was received during the
Inception Period.
 
                                       24
<PAGE>   26
 
LIQUIDITY AND CAPITAL RESOURCES
 
     The Company has financed its operations since inception through
collaborative agreements, government grants, private placements of equity
securities and capital leases. Through June 30, 1997, the Company's operations
have used cash of $6.0 million. The private placements of equity securities have
provided the Company with aggregate gross proceeds of approximately $20.1
million. The Company has drawn down $3.8 million through capital lease
financings and $3.0 million from an advance under a collaborative agreement. As
of June 30, 1997, the Company had approximately $15.0 million in cash, cash
equivalents and securities available-for-sale.
 
     The Company has invested $5.2 million in property and equipment since
inception, including equipment acquired under capital lease financings of $3.8
million. The Company expects capital expenditures to increase over the next
several years as it expands its facilities and acquires scientific equipment to
support the planned expansion of research and development efforts.
 
     As of June 30, 1997, the Company had net operating loss carryforwards of
approximately $6.6 million available to offset federal and state income taxes.
Research and development tax credit carryforwards for the Company were estimated
to be approximately $900,000 for federal income tax purposes. If not utilized,
the federal net operating loss and research and development tax credit
carryforwards will expire at various times through 2009. See Note 6 of Notes to
Financial Statements.
 
     The Company believes that the net proceeds from the Offering, its existing
capital resources, committed payments under its existing collaborative
agreements and licensing arrangements, equipment financing and interest income
will be sufficient to fund its current and planned operations for at least 18
months following the Offering. The Company intends to enter into additional
corporate collaborations which will provide funding for all or a part of the
Company's research and development activities. The Company's future capital
requirements will depend on many factors, including, among others, the
following: continued scientific progress in its discovery, research and
development programs; the magnitude and scope of these activities; the ability
of the Company to maintain existing and enter into additional corporate
collaborations and licensing arrangements; progress with preclinical studies and
clinical trials; the time and costs involved in obtaining regulatory approvals;
the costs involved in preparing, filing, prosecuting, maintaining, defending and
enforcing patent claims; and the potential need to develop, acquire or license
new technologies and products and other factors not within the Company's
control. The Company intends to seek additional funding through corporate
collaborations, licensing arrangements, public or private equity or debt
financings and capital lease transactions; however, there can be no assurance
that additional financing will be available on acceptable terms, if at all. If
sufficient capital is not available, the Company may be required to delay,
reduce the scope of, eliminate, or divest one or more of its discovery, research
or development programs, any of which could have a material adverse effect on
the Company's business, financial condition and results of operations. See "Risk
Factors -- Future Capital Needs; Uncertainty of Additional Funding."
 
                                       25
<PAGE>   27
 
                                    BUSINESS
 
INTRODUCTION
 
     Corixa focuses on the discovery and early clinical development of a novel
class of therapeutic and prophylactic vaccines. Although commercially available
vaccines can prevent infection by a variety of pathogens such as bacteria,
viruses and parasites through antibody-based immune responses, these responses
are not sufficient to eliminate cancers or certain infectious diseases,
including tuberculosis and Acquired Immune Deficiency Syndrome ("AIDS"). To
induce an effective immune response against these diseases, pathogen- or
tumor-reactive T lymphocytes ("T cells") must be stimulated. In particular,
cytotoxic T lymphocytes ("CTL") -- specialized T cells that have the ability to
recognize and kill pathogen-infected tissue or tumor cells -- must be activated.
 
     Corixa's therapeutic and prophylactic T cell vaccines represent a new
approach to the treatment of cancers and certain infectious diseases. The
markets for such vaccine products are extensive, particularly in oncology, given
that current treatments such as chemotherapy and radiation therapy may not lead
to lasting cure or prevention. Immunologists and molecular biologists recently
have identified certain previously unknown molecular signals that are
responsible for T cell recognition of pathogen and/or tumor-associated proteins
referred to as antigens. Corixa's vaccine products are designed to exploit these
recent developments by using each of the three components of its core technology
platform -- proprietary microsphere delivery systems, adjuvants and
antigens -- to force the immune system to recognize antigens in such a manner
that potent T cell, particularly CTL, responses are induced. The Company's
vaccines consist of proprietary antigens which may be encapsulated in
biodegradable and biocompatible microspheres combined with a proprietary
adjuvant, which is a molecule or substance capable of non-specifically enhancing
or boosting an immune response.
 
SCIENTIFIC BACKGROUND
 
     A variety of prophylactic vaccine products are commercially available for
the prevention of certain infectious diseases. However, these products do not
address therapeutic treatment of such diseases. The majority of current vaccines
trigger a protective antibody response capable of destroying an invading
pathogen in the event the patient is exposed to the pathogen in the future.
Antibodies are products of specialized immune system cells called B lymphocytes
("B cells") that recognize and attach to antigens and trigger the non-specific
elimination of the pathogen. Antigens are components of the invading pathogen
that are recognized by cells of the immune system. Current vaccines are made up
of whole organisms that contain antigens or antigens themselves, which can be
peptides, proteins or carbohydrates. Such vaccines are formulated by combining
antigens with an adjuvant, an immune system booster.
 
     The immune response begins when antigens are processed by a specialized
immune system cell called an antigen presenting cell ("APC"). Antigens are
processed by APCs through two distinct pathways, the Class I and Class II
Pathways. The antibody response produced by current vaccines results from
antigen processing only through the Class II Pathway. The Class II Pathway
breaks down antigens into specific peptides which are then presented on the
surface of an APC via major histocompatibility ("MHC") Class II proteins.
Antigen presentation via MHC Class II proteins results in activation of
CD4-positive helper T cells. These cells produce immune system hormones called
cytokines that serve to "help" with the generation of various components of both
cellular and antibody-based immune responses. Depending on the specific
cytokines that helper T cells produce, the helper T cell response is classified
as either Th1 or Th2. Th1 responses help generate and activate CTL and lead to
antibody production by B cells and possible pathogen elimination.
 
                                       26
<PAGE>   28
 
        Class I Antigen Presentation          Class II Antigen Presentation
                 Pathway                                  Pathway
 
[GRAPHIC]                                                              [GRAPHIC]
 
     Such antibody production can be sufficient to prevent or eliminate pathogen
infection in the case of certain diseases. However, antibody responses alone are
not sufficient in other diseases, such as cancer. In these other diseases, a
cellular immune response that includes the generation of CTL is necessary in
order to achieve protective immunity. While stimulation through the Class II
Pathway can lead to Th1 responses helpful in generating CTL, CTL activation
cannot occur without antigen presentation through the Class I Pathway. The Class
I Pathway breaks down antigens into specific peptides which are then presented
on the surface of an APC via MHC Class I proteins. Antigen presentation via MHC
Class I proteins results in generation and activation of CTL. The Company
believes that CTL are necessary to eliminate tumors and various pathogens that
antibodies alone cannot destroy.
 
     Corixa has shown in preclinical studies that CTL are capable of eliminating
either tumors or certain pathogens in settings where antibody responses fail.
Such CTL are not only capable of preventing disease when they are activated
prior to pathogen infection but are also able to eliminate disease or a tumor
once the infection has taken place or, in the case of cancer, once a tumor has
developed.
 
     The Company believes vaccines that can activate specific T cell responses
form the basis for a new class of products that may be used either in the
treatment or prevention of disease. Until recently, scientists lacked sufficient
understanding to design vaccine formulations capable of promoting T cell immune
reactivity against tumors or certain pathogens. The Company has incorporated
recent advances in the understanding of the molecular mechanism controlling how
antigens are normally presented to T cells and designed vaccine formulations
which incorporate disease-specific antigens into biodegradable and biocompatible
microspheres that give rise to potent CTL responses. The Company's antigen
discovery program has resulted in isolation of antigens from a variety of tumor
types and from infectious disease pathogens for which no vaccines currently
exist. Furthermore, the Company has discovered a novel adjuvant that has been
shown in preclinical studies to significantly enhance the efficacy of
microsphere formulated vaccines through the stimulation and activation of Th1
helper T cells and CTL. Corixa believes that its three proprietary core
technologies -- microsphere-mediated antigen delivery, novel adjuvants and
proprietary antigen discovery -- form the basis for the successful development
of such products.
 
                                       27
<PAGE>   29
 
CORIXA'S STRATEGY
 
     Corixa's objective is to be the leader in the discovery and
commercialization of T cell vaccine products for the treatment and prevention of
cancers and certain infectious diseases. The Company's strategy is to dedicate
its resources to vaccine discovery and to establish corporate partnerships as
early in the development process as possible for all aspects of product
development and commercialization, including research, clinical development,
obtaining regulatory approval, manufacturing and marketing. Corixa believes that
this research-and partner-driven approach creates significant scientific,
operational and financial advantages for the Company and accelerates the
commercial development of new therapeutic and prophylactic T cell vaccines.
Principal elements of the Company's strategy are as follows:
 
     Integrate the Company's Core Technologies. The Company believes that the
integration of its three proprietary core technologies may be essential to
providing effective vaccines for cancers and certain infectious diseases. These
technologies consist of: (i) proprietary delivery systems; (ii) potent, novel
adjuvants; and (iii) novel, specific antigens. Corixa believes that its three
component approach is unique among entities currently undertaking the
development of vaccines and has developed or acquired proprietary rights in each
of these technologies. Corixa also believes that integrating one or more of its
delivery systems, adjuvants or antigens with certain other companies'
proprietary technology may improve such companies' existing or
developmental-stage vaccine products.
 
     Establish Corporate Partnerships at an Early Stage. Corixa intends to enter
into corporate partnerships as early in the vaccine development process as
possible. For those products that show promise in the preclinical or clinical
stage, the Company will seek a corporate partner no later than prior to the
initiation of Phase II clinical trials. The Company believes that this active
corporate partnering strategy provides three distinct advantages: (i) it permits
Corixa to focus on its fundamental strengths in vaccine discovery and research;
(ii) it capitalizes on the corporate partner's strengths in product development,
manufacturing and commercialization; and (iii) it significantly reduces Corixa's
financing requirements. When entering into such corporate partnering
relationships, the Company seeks to cover its research and development expenses
through research funding, milestone payments and option, technology or license
fees, while retaining significant downstream participation in product sales
through either profit-sharing or product royalties paid on annual net sales.
 
     Partner Discrete Core Technologies and Non-Vaccine Products. Because the
Company believes that certain other companies' vaccine products may be enhanced
by components available from Corixa, the Company seeks to establish corporate
partnerships with major commercial entities for each of its proprietary core
technologies. For example, the Company may partner its proprietary antigens with
companies who have developed their own delivery and adjuvant technologies.
Similarly, Corixa believes that it can partner the Company's novel LeIF adjuvant
with a variety of vaccine companies that may have vaccine antigens but lack an
adjuvant with the appropriate Th profile. Corixa also believes it can partner
its antigen delivery technology with companies whose vaccines currently lack
sufficient recognition in vivo. Corixa further believes that certain of the
antigens it discovers may lead to the development of useful non-vaccine
products, particularly diagnostics, and the Company intends to establish
non-exclusive collaborations with a variety of diagnostic companies to generate
near-term royalty or other revenues.
 
CORIXA'S CORE TECHNOLOGY PLATFORMS
 
     Corixa seeks to discover and develop products that consist in whole or in
part of its three proprietary core technologies: (i) microsphere antigen
delivery systems that specifically activate helper T cells and CTL; (ii)
adjuvants that specifically enhance helper T cell and CTL responses; and (iii)
disease specific antigens that are essential to elicit appropriate T cell
responses.
 
  Microsphere Antigen Delivery Systems
 
     Corixa has demonstrated in preclinical studies that potent antibody and CTL
responses can be generated against antigens using the Company's proprietary
microsphere antigen delivery system. The Company has determined that CTL
generated as a result of microsphere-mediated antigen presentation are capable
of
 
                                       28
<PAGE>   30
 
killing antigen positive cells either in vitro (in test tubes) or in preclinical
studies of immune function. For example, injection of microsphere-encapsulated
tumor antigens in animals generated an immune response that prevented growth of
antigen positive tumors when such animals were later challenged with a lethal
dose of tumor cells. The immune cells responsible for this microsphere-mediated
tumor rejection were shown to be antigen specific CTL. Immunization with naked
(not encapsulated) antigens did not activate CTL responses, nor was such
immunization able to result in protective immunity in animals later challenged
in the same manner.
 
     Corixa believes that microsphere-mediated antigen delivery may be superior
in terms of versatility, stability, safety and cost to other approaches which
circumvent the antigen presentation pathways, including the use of various gene
therapies as well as liposome or recombinant-protein lipid formulations.
Microspheres of the particular size range used by the Company are taken up only
by APCs. This is not true for formulations containing genes or lipids, where
significant amounts of the delivered product are taken up by non-APCs or lost in
the blood stream or elsewhere in the body. Microsphere delivery of antigens may
also avoid certain safety issues associated with gene therapy. Because Corixa
uses microspheres that are produced from FDA-approved, synthetic co-polymers,
there is no immune response to the microsphere itself, in contrast to the immune
response that can occur to other proteins encoded by viral or bacterial vectors
used in gene therapy. Additionally, a single, microsphere formulation may be
useful in multiple vaccine products. This avoids the repetitive costs associated
with construction, manufacture and testing of different gene therapy vectors or
recombinant protein-lipid formulations for different target indications.
Furthermore, Corixa believes that its microsphere vaccine preparations will be
stable as freeze-dried formulations, resulting in a multi-year shelf-life.
 
     The Company has an exclusive worldwide license to a number of patents and
pending patent applications from SRI covering the composition, use and
production of microspheres for augmenting immune responses. In addition, the
Company has an exclusive worldwide license to antigen delivery technology from
the Dana-Farber Cancer Institute ("Dana-Farber") comprising patent applications
claiming the composition and use of microspheres of a particular size range for
the purpose of activating CTL. The Company is also internally developing certain
microsphere technology. See "-- Certain License Agreements" and "-- Patents and
Proprietary Technology."
 
  Adjuvants
 
     Adjuvants are formulations and/or additives that are routinely combined
with vaccines to boost immune responses directed against the antigens in such
vaccines. Because current vaccines depend upon the generation of antibody
responses to injected antigens, commercially available adjuvants have been
developed largely to enhance such antibody responses. To date, there are no
adjuvants that have been approved for use in humans which augment helper T cell
and CTL responses.
 
     Corixa has identified a protein, known as LeIF, that functions as a potent
adjuvant for enhancing immune responses directed at T cell vaccine antigens.
LeIF is a protein produced by the parasite Leishmania, which is carried by
sandflies and causes both a skin and visceral disease known as Leishmaniasis. In
cell culture studies conducted by the Company, LeIF has been found to have
potent immune system stimulatory effects, both for cells from individuals who
have been exposed to the parasite and from individuals who have not been so
exposed.
 
     Preclinical studies conducted by Corixa indicate that LeIF is a unique
protein stimulator of a Th1 response. Additional research conducted by the
Company has confirmed that the cell within the immune system that responds to
LeIF is an APC. APCs stimulated with LeIF produce large quantities of a certain
cytokine and a certain cell surface protein, both of which are molecular signals
required for the generation of potent CTL responses. Corixa has conducted
further research to determine whether LeIF functions as an adjuvant for T cell
vaccines. In prelinical studies, use of microsphere-encapsulated tumor antigens
together with LeIF resulted in tumor regression, even when administered to
animals with established tumors. In all cases, tumor regression was shown to
correlate with the in vivo development of tumor antigen reactive CTL. As a
result, Corixa's research suggests that immunity induced by the combination of
microsphere-
 
                                       29
<PAGE>   31
 
encapsulated antigens and the LeIF adjuvant is both antigen specific and
long-lived. Treated animals were still able to reject lethal doses of antigen
positive tumors when challenged more than four months after therapy.
 
     Corixa believes that the use of LeIF as an adjuvant will greatly enhance
the efficacy of its T cell vaccines. The Company also believes that LeIF,
together with microsphere-encapsulation technology, may be useful in developing
therapeutic products from current prophylactic vaccines due to the ability of
the Company's technologies to promote potent Th1 and CTL responses. Corixa has
granted licenses to or options to license its LeIF technology to several
corporate partners, including SmithKline Beecham, PMC, Vical and Heska. See
"-- Corporate Partnerships -- Adjuvants" and "-- Other Products in Development."
 
                   THROUGH A VARIETY OF PROPRIETARY METHODS,
                  CORIXA IMMUNOLOGICALLY "SIEVES" FOR ANTIGENS
                 AGAINST CANCERS AND OTHER INFECTIOUS DISEASES.
 
                                    GRAPHIC
 
                                   NOVEL AND
                                DISEASE-SPECIFIC
                                    ANTIGENS
 
  Antigen Discovery
 
     Corixa's ability to discover and patent multiple antigens allows it to
select those which will work most effectively in a given vaccine (i.e., are
recognized by the greatest percentage of individuals, stimulate the strongest
immune response and are expressed by the greatest percentage of pathogen strains
or tumor types). To capitalize on this ability, over half of Corixa's scientific
personnel are devoted to antigen discovery. Discovery approaches and
technologies used by the Company in both tumor and infectious disease vaccine
development include: (i) tumor tissue procurement and SCID mouse tumor
propagation; (ii) differential display; (iii) cDNA subtraction; (iv) expression
cloning; (v) pathogen protein purification; (vi) antigenic peptide stripping;
and (vii) immunological characterization of candidate tumor vaccine antigens.
The Company's discovery approaches map patient immune responses to ensure that
discoveries focus on
 
                                       30
<PAGE>   32
 
identification of pathogen and tumor proteins that are recognized by the human
immune system and are therefore antigenic. See "-- Vaccine Antigen Discovery
Methodologies."
 
     The culmination of Corixa's antigen discovery research is the isolation of
pathogen genes that encode those antigens with significant potential to be
effective components of vaccines. Such antigens (in the form of either
recombinant proteins or biosynthetically produced peptides) are then formulated
in microspheres for vaccination. Multiple pathogen and/or tumor gene and protein
sequences have been discovered by the Company. As of June 30, 1997, the Company
had filed numerous patent applications seeking both composition of matter and/or
vaccine and diagnostic method of use claims to: (i) approximately 160 gene
sequences that are either uniquely expressed or markedly over-expressed by
breast cancer cells; (ii) approximately 60 gene sequences that are either
uniquely expressed or markedly over-expressed by prostate tumor cells or
prostate tissue; and (iii) approximately 70 gene sequences expressed by
Mycobacterium tuberculosis.
 
     There can be no assurance that patents will issue from any of the pending
applications, or that if issued, such patents will not be challenged,
invalidated or circumvented by third parties, or that the rights granted under
any issued patents will provide adequate proprietary protection or competitive
advantages to the Company. The Company's three core technologies are at an early
stage of development. There can be no assurance that any of such technologies
will prove to be safe and effective, and products which may result from the
Company's research and development programs are not expected to be commercially
available for a number of years, if at all. See "-- Patents and Proprietary
Technology," "Risk Factors -- Uncertainties Related to Early Stage of
Development" and "-- Uncertainties Related to Technology and Product
Development."
 
                                       31
<PAGE>   33
 
CORIXA'S PRODUCTS IN DEVELOPMENT
 
     Corixa has a number of products in various stages of development, many of
which are the subject of collaborations with corporate partners. The following
table sets forth the type of product currently in development, the
application(s) for the particular product, its present stage of development and
the identity of the Company's corporate partner, if any, for such product
application.
 
<TABLE>
<S>               <C>                             <C>                    <C>
- ---------------------------------------------------------------------------------------------------
                                 CORIXA'S PRODUCTS IN DEVELOPMENT
- ---------------------------------------------------------------------------------------------------
 PRODUCT          APPLICATION                     DEVELOPMENT PHASE(1)   PARTNER
- ----------------  ------------------------------  ---------------------  --------------------------
 VACCINES         Breast/Prostate Cancer          Research               SmithKline Beecham
                  Vaccines                                               Biologicals S.A.
                  Two Cancer Vaccine Targets      Research               SmithKline Beecham
                                                                         Biologicals S.A.
                  Her-2/neu Peptide Vaccines for  Phase I Clinical       Not currently partnered
                  Breast and Ovarian Cancer       Trials
                  Lung Cancer, Lymphoma and       Research               Not currently partnered
                  Other Vaccines
                  Tuberculosis Vaccines           Preclinical Studies    SmithKline Beecham
                                                                         Biologicals S.A.
 ADJUVANTS        LeIF as an Adjuvant for         Preclinical Studies    Pasteur Merieux Connaught
                  Certain Infectious Disease
                  Vaccines
 DIAGNOSTICS      Trypanosoma cruzi               Development            DiaMed S.A.
                  Trypanosoma cruzi - Diagnostic  Development            Centocor UK Limited
                  and Blood Screen
                  Tuberculosis                    Development            Abbott Laboratories
                  Leishmaniasis                   Early Stage            Various diagnostic
                                                  Commercialization      companies
                  Tick-Borne Diseases             Preclinical Studies    Not currently partnered
 OTHER PRODUCTS   Adoptive Immunotherapy -        Preclinical Studies    CellPro, Incorporated
                  Cancer
                  Certain Autoimmune Diseases     Research               Novo Nordisk A/S/
                                                                         ZymoGenetics, Inc.
                  Cancer; LeIF Gene as an         Research               Vical Incorporated
                  Immunomodulator
                  Certain Technologies for        Development            Heska Corporation
                  Companion Animal Health
- ---------------------------------------------------------------------------------------------------
</TABLE>
 
(1) "Research" indicates the discovery or creation of prototype products and
      includes antigen discovery, immunomodulator discovery and
      characterization.
    "Development" indicates testing of prototype diagnostic assays in a
      particular format and testing of such products.
    "Preclinical Studies" indicates product scale up, formulation and further
      testing in animals, including toxicology.
    "Phase I Clinical Trials" are performed to evaluate the safety of a vaccine
      and its ability to stimulate an immune response.
    "Early Stage Commercialization" indicates sales to third parties for use in
      diagnostic applications which have resulted in immaterial revenues to
      date.
 
  Vaccine Products
 
     Breast and Prostate Cancer Vaccines. Breast and prostate cancer are
currently among the most widespread malignant diseases in women and men,
respectively. According to industry sources, over 525,000 patients were
diagnosed with breast cancer and over 625,000 patients were diagnosed with
prostate cancer in Europe, Japan and North America in 1995. A large percentage
of these patients undergo chemotherapy, radiation therapy and surgery, yet the
vast majority are likely to relapse with malignant disease within ten years
following surgical intervention. Corixa believes that its vaccines will
initially be useful in those patients who have undergone surgery.
 
                                       32
<PAGE>   34
 
     The Company has identified over 300 gene sequences that are either uniquely
expressed or markedly over-expressed in breast tumors and/or prostate tumors or
tissue. Analysis of comparative expression of such genes in multiple tumor
specimens and in normal tissue has resulted in patent filings on approximately
220 gene sequences which the Company believes may be valuable for inclusion in
vaccine products. The Company has begun the immunological characterization of
these gene sequences with the goal of selecting several antigens for use in
vaccines for breast and prostate cancer. In March 1997, Corixa entered into
corporate partnerships with SmithKline Beecham in the areas of breast and
prostate tumor vaccines. See "-- Corporate Partnerships -- Breast and Prostate
Cancer Vaccines."
 
     Her-2/neu Peptide Tumor Vaccines. According to New Medicine, Inc., over
525,000 new breast cancer patients and 80,000 new ovarian cancer patients are
diagnosed in Europe, Japan and North America each year. Of these patients,
approximately 50% markedly over-express the gene Her-2/neu on the surface of
their respective breast and ovarian carcinomas. To date, in in vitro studies
with animal and human cells, peptides from the Her-2/neu protein have been shown
to generate potent T cell immune responses. In vitro data indicate that cells
from different patients respond to different Her-2/neu peptides. Consequently,
the Company is currently developing a "cocktail" approach to vaccine
formulation, combining multiple peptides in a single vaccine. The Company
believes that a "cocktail" of peptides may be useful as a therapeutic vaccine
for breast and ovarian cancer patients whose tumors over-express Her-2/neu.
 
     In July 1996, pursuant to certain contractual obligations, Corixa, together
with the University of Washington, filed an investigational new drug application
to begin a clinical trial of three different Her-2/neu peptide vaccines in
breast and ovarian carcinoma patients. This Phase I clinical trial began
accruing patients in September 1996. Safety is the primary endpoint of this
clinical trial, which consists of up to 60 patients who will each receive
monthly vaccinations for a period of six months. Secondary endpoints of the
trial focus on the ability of such vaccination to lead to demonstration of
anti-Her-2/neu immune reactivity and/or clinical response. This clinical trial
currently uses naked Her-2/neu peptides together with granulocyte macrophage
colony stimulating factor as an adjuvant. The Company is also conducting
preclinical studies with microsphere-encapsulated formulations of Her-2/neu
peptides and LeIF as an adjuvant as a prelude to adding these components of its
proprietary core technology to either the current clinical trial or, if required
by the FDA, a separate Phase I clinical trial. Corixa has an exclusive worldwide
license to Her-2/neu peptide vaccine technology from the University of
Washington. See "-- Certain License Agreements."
 
     Lung Cancer, Lymphoma and Other Vaccines. Building on the Company's initial
progress in cancer antigen discovery aimed at the development of breast and
prostate tumor vaccines, Corixa has initiated additional discovery programs in
several other tumor types, including lung cancer and Non-Hodgkin's lymphoma
("NHL"). According to industry sources, both lung cancer and NHL have mortality
rates well above the normal mortality rates for cancers generally, with five
year mortality rates of 86% and 49%, respectively. Lung cancer is now the
leading cancer killer in Europe, Japan and North America, with incidence in 1995
in those countries estimated at approximately 520,000 people. NHL incidence in
the developed world was estimated at 137,000 in 1995. Due to the magnitude and
severity of such diseases, and the absence of effective therapies in these
areas, Corixa has begun to undertake antigen discovery and vaccine development
efforts in these tumor types using approaches similar to those it uses in breast
and prostate cancer. See "-- Corixa's Vaccine Antigen Discovery Methodologies."
Additionally, Corixa is currently engaged in discussions with several
pharmaceutical companies with respect to potential corporate partnering
arrangements in the areas of lung cancer, leukemia and lymphoma vaccines. There
can be no assurance, however, that such discussions will lead to the
establishment of any new corporate partnerships on favorable terms, or at all.
See "Risk Factors -- Dependence on and Management of Existing and Future
Corporate Partnerships."
 
     Tuberculosis Vaccines. Tuberculosis ("Tb"), caused by infection with
Mycobacterium tuberculosis ("Mtb"), results in more deaths than any other
infectious disease in the world. The market for potential Tb vaccines is
extensive. According to industry sources, there are an estimated 8.8 million new
cases of Tb worldwide. Once believed to be eradicated in the United States, Tb
is now growing in prevalence. From 1985 to 1992, the number of cases increased
20% in the United States and the percentage of patients with antibiotic
 
                                       33
<PAGE>   35
 
resistant mycobacteria increased from less than 1% to more than 25% in some
areas of the country. Corixa's goal is to develop specific prophylactic vaccines
for both conventional and drug-resistant strains of Mtb.
 
     Corixa has identified over 60 novel candidate Tb gene products that
specifically trigger appropriate helper T cell responses in vitro. These gene
products are the subject of multiple patent applications filed by the Company
covering compositions of matter and vaccine and diagnostic methods of use. The
in vitro tests have led to the selection of several candidate vaccine antigens.
Some of these antigens have been skin-tested in both infected-healthy and
infected-diseased individuals in South America to determine which antigens are
recognized by both patient populations. Results from such tests, together with
continued analysis of patient T cell responses, has led to the commencement by
Corixa of preclinical studies for both therapeutic and prophylactic vaccine use.
In October 1995, the Company entered into a corporate partnership with
SmithKline Beecham for the development of Tb vaccines. Based on the Company's
progress, the research phase of this corporate partnership was recently extended
for an additional one year period. See "-- Corporate
Partnerships -- Tuberculosis Vaccines."
 
  Adjuvants
 
     Corixa has discovered a gene from the parasite Leishmania that codes for
the protein LeIF, which is capable of stimulating Th1 helper and CTL responses.
The Company has demonstrated in preclinical studies that when combined with
certain target antigens, LeIF induces a stronger antibody response directed
against the target antigen than was induced by such antigen alone.
Co-administration of LeIF with various T cell vaccines in preclinical studies
for both infectious disease and tumors results in enhanced generation of anti-
vaccine reactive CTL.
 
     Corixa currently produces LeIF as a recombinant protein in bacteria. The
Company anticipates that it will use LeIF in its proprietary vaccine
formulations and will also out-license LeIF for incorporation as an adjuvant in
vaccines outside of the Company's cancer and infectious disease targets. In
December 1996, the Company entered into a corporate partnership with PMC. This
corporate partnership provides PMC with the option to license LeIF for use with
vaccines in five different infectious disease indications. See "-- Corporate
Partnerships -- Adjuvants."
 
  Diagnostic Products
 
     The Company believes that many of the antigens it has discovered in the
fields of cancer and infectious disease also have applications in the diagnosis
of disease. Antigens are used in diagnostic tests to determine whether an
individual possesses antibodies against the antigen. The presence of such
antibodies indicates that the individual is infected by the pathogen. Infectious
disease diagnostic products for the following indications are currently under
development at Corixa:
 
     Trypanosoma cruzi ("T. cruzi"). T. cruzi is an intracellular blood and
tissue parasite endemic to South America, Central America and Mexico that is
most commonly transmitted by blood transfusion. T. cruzi is responsible for the
development of Chagas' disease, which can develop into fatal infectious heart
disease. Current diagnostic procedures to determine blood exposure to T. cruzi
infection are based on the detection of patient antibodies that react with crude
extracts of this parasite. These tests often produce false results due to their
inability to distinguish antibodies against T. cruzi from antibodies against
other infectious agents. The Company has discovered and evaluated in vitro a
number of peptides encoded by genes of the T. cruzi parasite for their ability
to serve as highly specific and sensitive reagents for detection of T. cruzi.
Corixa has licensed its T. cruzi antigen technology for the development of both
blood screen and point-of-care diagnostic tests to several diagnostic companies,
including DiaMed and Centocor. See "-- Corporate Partnerships -- Diagnostic
Products."
 
     Tuberculosis. Corixa believes that many antigens currently under
investigation by the Company could be useful in the development of novel
diagnostics to determine whether patients have been infected with Mtb. Current
diagnostic assays to determine Mtb infection are expensive and labor intensive.
The majority of patients exposed to Mtb receive chest x-rays, and attempts are
made to culture the bacterium in vitro from sputum samples. Mtb grows poorly and
slowly outside the body, which can produce false negative test results.
 
                                       34
<PAGE>   36
 
In addition, standard skin tests are not ideal in detecting infection and cannot
be used in areas of the world where patients receive childhood vaccination with
bacterial strains related to Mtb. The Company is developing a combination of
proprietary antigens that may be used in detecting the presence and degree of
Mtb infection. The Company has granted to Abbott a non-exclusive license to
certain of its Tb antigen technologies and intends to pursue additional
out-licensing opportunities for this product. See "-- Corporate Partnerships --
Tuberculosis Vaccines."
 
     Leishmaniasis. The parasite Leishmania causes a systemic disease of the
liver, spleen and bone marrow called Leishmaniasis that can be fatal if not
treated. The disease is endemic to Southern Europe, the Middle East, Africa,
China and India, as well as Central and South America. The largest United States
population infected with Leishmania are military personnel and veterans who were
exposed to the parasite while stationed in the Middle East during the Gulf War.
Leishmania has also become a leading cause of opportunistic infection in AIDS
patients in Southern Europe. Currently, the most reliable test for this parasite
infection is an extremely costly and potentially dangerous procedure requiring
the collection of bone marrow from patients and microscopically searching for
evidence of such infection. Corixa has identified and patented a Leishmania
antigen that is useful in determining whether patients are infected with the
parasite. Corixa has licensed its Leishmania diagnostic technology to various
diagnostic companies on a non-exclusive basis. The Company is currently
negotiating with other diagnostic companies who have expressed interest in
developing either rapid physician office or field-based diagnostics using the
Company's patented technology. See "-- Corporate Partnerships -- Diagnostic
Products."
 
     Tick-Borne Diseases. There are multiple diseases, such as Lyme disease,
caused by pathogens harbored by several tick species in North America. Recent
scientific investigation has identified two tick-borne pathogens, Ehrlichia and
Babesia microti, which can lead to Lyme disease-like infections and which can
also cause death. No diagnostic tests currently exist for these pathogens.
Corixa has identified multiple genes encoded by these pathogens that the Company
believes may form the basis of novel diagnostic products and has begun
discussions with diagnostic companies that have expressed interest in this
field.
 
  Other Products in Development
 
     Adoptive Immunotherapy Products. Because T cells, and CTL in particular,
are generally believed to be essential for the generation of protective immunity
against tumors, scientists and clinicians have for many years studied the
potential of using CTL obtained from patients and grown outside the body (ex
vivo) for use in treating patients with advanced cancer. CTL grown ex vivo have
been shown to be effective in shrinking and/or eliminating tumors, both in
animal models and in clinical trials. This therapeutic approach, called adoptive
immunotherapy, has been limited by its dependence on the ability to grow
sufficient numbers of tumor antigen reactive CTL or other T cell populations ex
vivo for re-infusion into cancer patients. Corixa believes that several of its
core technologies will be useful in the development of adoptive immunotherapy
procedures for cancer treatment, and the Company has identified multiple tumor
antigens that can be used to stimulate in vitro growth of tumor-reactive CTL. In
addition, the Company's microsphere and adjuvant technologies have been
demonstrated to enhance the in vitro generation and growth of tumor antigen
reactive CTL. In November 1995, Corixa entered into a license and collaborative
research agreement with CellPro which provides CellPro with exclusive access to
Corixa's microsphere antigen delivery, adjuvant and antigen discovery technology
for CellPro's use in the discovery and development of products for the adoptive
immunotherapy of cancer, and CellPro's rights to such technology are exclusive
even as to the Company with respect to adoptive T cell immunotherapy of cancer.
See "-- Corporate Partnerships -- Other Products."
 
     Autoimmune Disease Products. In some instances, the immune system can
mistakenly identify host tissue as though it was an invading pathogen. Such
mistaken recognition plays a key role in the development of diseases such as
diabetes, rheumatoid arthritis, lupus and multiple sclerosis. Severity and onset
of the disease can be associated with the development of a Th1 response.
Elimination of this type of helper T cell response has been demonstrated to have
a beneficial effect on the duration or severity of autoimmune disease in
preclinical studies. Corixa has isolated novel pathogen proteins (i.e., LeIF)
that exclusively stimulate Th1 helper T cell responses, and has entered into a
corporate partnership with ZymoGenetics aimed at the
 
                                       35
<PAGE>   37
 
discovery of new pharmacologic agents useful in the treatment of autoimmune
diseases. See "-- Corporate Partnerships -- Other Products."
 
     Products with LeIF Gene as an Immunomodulator. LeIF functions as a potent
adjuvant due in part to its ability to induce APC production of a certain
cytokine and a certain cell surface protein, two important molecular signals
required for the generation of potent cellular immune responses. Many
scientists, as well as pharmaceutical and gene therapy companies, are exploring
the utility of this cytokine and this cell surface protein to promote anti-tumor
responses. Corixa and its academic collaborators are researching the ability of
LeIF to promote anti-tumor immune responses when administered as a stand-alone
agent in preclinical studies of malignant disease. Based on the results of these
experiments, which demonstrated an anti-tumor effect of LeIF therapy, the
Company has granted Vical an option to license certain LeIF technology. See
"-- Corporate Partnerships -- Other Products."
 
     Animal Health Products. The Company believes that certain of its vaccine
and diagnostic products also may have applications in the detection of infection
and treatment of disease in animals. One such disease is Leishmaniasis, which
can be carried by dogs. Europe is the primary market for these products. The
Company is currently collaborating with Heska, a developer and marketer of
companion animal diagnostics and therapeutic products, including vaccines for
certain parasitological diseases, to develop both diagnostics and vaccines for
the treatment of Leishmaniasis in dogs. The Company has also granted Heska a
license to use LeIF in combination with other types of vaccines in the companion
animal field. Corixa intends to explore further opportunities to out-license its
technology for use in animal health markets. See "-- Corporate
Partnerships -- Other Products."
 
     The Company's products are in an early stage of development and have not
been demonstrated to be safe or effective. There can be no assurance that any of
the Company's programs will move beyond its current stage of development. In
addition, even if the Company is able to successfully complete its development
efforts with respect to a particular product, there can be no assurance that
regulatory approvals will be obtained or that any such product can be
successfully manufactured and commercialized. See "Risk Factors -- Uncertainties
Related to Technology and Product Development."
 
CORPORATE PARTNERSHIPS
 
     Corixa's strategy is to establish multiple corporate partnerships with
pharmaceutical, biopharmaceutical and diagnostic companies that have the
expertise and capability to develop, manufacture, obtain regulatory approval of
and commercialize the Company's products. In such corporate partnerships, Corixa
seeks to cover its research and development expenses through research funding,
milestone payments and option, technology or license fees, while retaining
significant downstream participation in product sales through either profit-
sharing or product royalties paid on annual net sales. The Company has focused
initially on three areas of collaboration, including vaccine discovery programs,
diagnostic technology and out-licensing its three proprietary core technologies
for applications outside the Company's focus.
 
  Vaccines
 
     Breast and Prostate Cancer Vaccines
 
     SmithKline Beecham. In March 1997, the Company entered into breast and
prostate cancer collaboration and license agreements and an option agreement
with SmithKline Beecham. The Company granted SmithKline Beecham an exclusive
worldwide license to develop, manufacture and sell vaccine products resulting
from this corporate partnership. The Company also granted SmithKline Beecham an
option to license certain other related technology for use in these cancer
vaccines. Under the collaboration and license agreements, SmithKline Beecham
agreed to provide annual research funding to support the Company's current
program to discover breast and prostate cancer antigens. To the extent breast or
prostate cancer antigens are discovered and selected for further development,
the Company is entitled to receive future payments upon the achievement of
certain contractual milestones relating to drug development and regulatory
progress, as well as royalty payments on any product sales. SmithKline Beecham
may elect to extend the research program beyond its initial two-year term based
upon mutually agreed terms. In the event SmithKline
 
                                       36
<PAGE>   38
 
   
Beecham elects to extend the research program, payments by SmithKline Beecham
under the collaboration and license agreements for such extension, research
funding and achievement of contractual milestones may total up to $46.0 million,
which amounts are payable over time based on extension of the research program
and achievement of contractual milestones. SmithKline Beecham may terminate
either or both of the breast and prostate cancer programs in the event the
Company does not meet certain scientific milestones after the second anniversary
of the effective date of the respective agreements. Under the option agreement,
SmithKline Beecham paid certain consideration in exchange for exclusive options
to license two of Corixa's early-stage antigen discovery programs in two cancer
targets. In the event such options are exercised, then at SmithKline Beecham's
election, such consideration will either be credited against future milestone
payments or converted into Common Stock of Corixa. If SmithKline Beecham elects
to exercise both such options and convert such consideration into Common Stock,
the number of such shares that the Company is obligated to issue will be
dependent upon the then-current fair market value of such Common Stock. Assuming
such fair market value is $13.00 per share, the Company would be obligated to
issue an aggregate of approximately 207,433 shares of Common Stock, which amount
would represent beneficial ownership of approximately 1.85% of the Common Stock
(based upon 10,994,331 shares of Common Stock to be outstanding upon completion
of the Offering). Because the fair market value of the Common Stock is variable,
the number of shares of Common Stock that the Company is obligated to issue upon
exercise of such options may be a greater or lesser number than set forth above.
In the event either or both of such options are not exercised or extended by
February 28, 1998 with respect to one cancer target and August 31, 1998 with
respect to the other cancer target, the Company will be required to repay the
amounts paid by SmithKline Beecham for such option(s) over a three-year period
beginning in March 2000. See Note 8 of Notes to Financial Statements.
    
 
     Tuberculosis Vaccines
 
   
     SmithKline Beecham. In October 1995, the Company entered into an option and
collaborative research agreement with SmithKline Beecham. Under the option and
collaborative research agreement, the Company granted SmithKline Beecham an
option to receive an exclusive worldwide license to the Company's vaccine
antigens discovered under Corixa's Mtb antigen discovery program. If SmithKline
Beecham exercises its option, it will receive an exclusive worldwide license to
use any or all such antigens, provided that such rights shall be co-exclusive
with Corixa in Japan. SmithKline Beecham paid an up-front technology access fee
and agreed to provide annual research funding to support the Company's program
to discover Mtb antigens. In addition, if SmithKline Beecham exercises its
option, the Company is entitled to receive an option exercise fee and future
payments upon the achievement of certain contractual milestones relating to drug
development and regulatory progress, as well as royalty payments on any product
sales. Under the option and collaborative research agreement, payments by
SmithKline Beecham to Corixa for research funding, the option exercise fee and
achievement of contractual milestones may total up to approximately $19.3
million. In February 1997, the Company and SmithKline Beecham agreed to renew
the Mtb research program through May 1998, and extended SmithKline Beecham's
option to license Mtb antigens through August 1998, which amounts are payable
over time based on extension of the research program and achievement of
contractual milestones.
    
 
  Adjuvants
 
     Pasteur Merieux Connaught. In December 1996, the Company entered into an
option and license agreement with PMC whereby the Company granted PMC an option
to license its novel adjuvant LeIF for exclusive use in influenza and
respiratory syncytial virus and non-exclusive use in HIV, Tb and malaria. Under
the option and license agreement, PMC paid an up-front option fee and, in the
event and to the extent PMC exercises its option, PMC has agreed to pay exercise
fees for each disease indication. In addition, in the event PMC exercises its
option for one or more disease fields, the Company is entitled to receive future
payments upon the achievement of certain contractual milestones relating to drug
development and regulatory progress, as well as royalty payments on any product
sales and annual research funding to support the Company's preclinical
development efforts related to LeIF. PMC's option will terminate in the event
PMC has not exercised its right in at least one disease field on or before
September 1997.
 
                                       37
<PAGE>   39
 
  Diagnostics
 
     The Company has entered into and intends to continue to pursue corporate
partnerships in the fields of cancer and infectious disease diagnostics to
complement its therapeutic research efforts and to expand its scientific
platform. The Company has established corporate partnerships for the development
of diagnostics for infectious diseases with Abbott, DiaMed, Centocor and other
small diagnostic companies. Under these arrangements, the Company generally
grants a non-exclusive license to Corixa's antigens for use in specified
infectious disease indications in exchange for the respective corporate
partner's agreement to make certain payments upon achievement of development
milestones, a commitment to purchase a minimum number of reagents and an
agreement to pay royalties on any product sales. In addition, the Company has
collaborated exclusively with GenQuest for the development of diagnostics for
cancer. See "-- Relationship with GenQuest, Inc."
 
  Other Products
 
     Adoptive Immunotherapy Products
 
   
     CellPro. Effective as of November 1995, the Company entered into a license
and collaborative research agreement with CellPro. Under the license and
collaborative research agreement, the Company granted CellPro an exclusive
worldwide license to Corixa's proprietary vaccine technologies -- microsphere
antigen delivery, the LeIF adjuvant and novel cancer antigens -- in the field of
adoptive immunotherapy of cancer, and CellPro's rights to such technology are
exclusive even as to the Company with respect to adoptive T cell immunotherapy
of cancer. As consideration for the license, CellPro paid the Company up-front
license fees and agreed to make future payments upon the achievement of certain
contractual milestones relating to drug development and regulatory progress, as
well as royalty payments on any product sales. In addition, the Company is
entitled to receive annual research funding to support the corporate
partnership's scientific objectives. Under the license and collaborative
research agreement, payments by CellPro to Corixa for research funding and
achievement of contractual milestones may total up to approximately $10.2
million, which amounts are payable over time based on extension of the research
program and achievement of contractual milestones. The Company and CellPro must
agree annually upon the scientific objectives for the ensuing year. CellPro may
terminate funding for the adoptive immunotherapy research program in the event
the Company fails to perform certain obligations under such research program.
Effective January 1997, the Company and CellPro amended the license and
collaborative research agreement to provide for a co-exclusive license to
dendritic cell vaccines incorporating the Company's cancer vaccine technology
and a sharing of any license fees or royalty payments arising under the
co-exclusive license.
    
 
     Autoimmune Disease Products
 
     ZymoGenetics. In September 1996, the Company entered into a license and
collaborative research agreement with ZymoGenetics. Under the license and
collaborative research agreement, ZymoGenetics agreed to provide annual research
funding to support the Company's research program for the discovery of certain
vaccine technology for autoimmune diseases. In addition, the Company is entitled
to receive future payments upon the achievement of certain contractual
milestones. The Company granted ZymoGenetics an exclusive worldwide license to
vaccine technology discovered under the funded research program in the fields of
diabetes, multiple sclerosis and rheumatoid arthritis. The Company retained
rights to all discoveries resulting from the funded research program in all
other fields. ZymoGenetics may terminate the license and collaborative research
agreement in the event the Company does not meet certain scientific milestones
or at any time after September 30, 1997.
 
     LeIF Gene as an Immunomodulator
 
     Vical. In April 1996, the Company entered into an option agreement with
Vical. Under the option agreement, Vical received an option to license the
Company's LeIF gene as a single gene immunomodulator in the field of cancer.
Vical paid an up-front option fee and, to the extent it exercises its option,
Vical has agreed to pay an option exercise fee and to make additional payments
upon the achievement of certain contractual milestones relating to drug
development and regulatory progress, as well as royalty payments on
 
                                       38
<PAGE>   40
 
any product sales. The Company and Vical have amended the option agreement in
order to extend the option exercise period. As amended, the option agreement
will terminate on October 26, 1997 unless Vical exercises its option prior to
such termination.
 
     Animal Health Products
 
     Heska. In March 1996, the Company entered into a license and research
agreement with Heska. Under the license and research agreement, the Company
granted Heska an exclusive worldwide license to Corixa's LeIF adjuvant for use
in certain of Heska's vaccines and for use as a stand-alone vaccine against
canine leishmaniasis. In addition, the Company granted Heska a license to its
diagnostic antigen, K39, for use in detecting canine leishmaniasis. The license
is exclusive worldwide, except that it is non-exclusive in Central and South
America. Heska paid an up-front license fee and agreed to make future payments
upon the achievement of certain development milestones, as well as royalty
payments on any product sales. In December 1996, Heska made a payment to the
Company based on achievement of a development milestone for the Company's K39
diagnostic product.
 
     The Company's corporate partnership agreements generally provide recourse
for the Company with respect to its existing product and technology rights in
the event of an uncured material breach of such an agreement by a corporate
partner. In such event, Corixa generally may elect to terminate the licenses
granted to such corporate partner under such agreement. However, because
Corixa's strategy for the discovery, research, development, clinical testing and
commercialization of its products is to enter into multiple corporate
partnerships, the success of the Company is substantially dependent on its
ability to enter into and maintain such arrangements on terms favorable to the
Company, its ability to successfully manage current or future corporate
partnerships, if any, and the ability of its corporate partners to perform their
respective obligations under such arrangements. There can be no assurance that
the Company will be able to negotiate any additional corporate partnerships on
favorable terms, or at all, that its current corporate partnerships will be
successful or that its corporate partners will perform their obligations under
such arrangements in a timely manner or at all, any of which would have a
material adverse effect on the Company's business, financial condition and
results of operations. See "Risk Factors -- Dependence on and Management of
Existing and Future Corporate Partnerships."
 
RELATIONSHIP WITH GENQUEST, INC.
 
     Corixa is a principal stockholder in, and has received licenses in the
field of cancer vaccines from, GenQuest, a privately-held company formed in 1995
to exploit functional genomics technology developed by Dr. Paul Fisher and
Columbia University. GenQuest is engaged in discovery of new genes related to
the transformation of normal cells into cancer cells and research of novel genes
that are uniquely expressed by cancer cells. The Company believes that its
relationship with GenQuest will lead to the identification of additional genes
uniquely expressed by cancer cells that are useful in the Company's research
programs.
 
     Genomics refers to the organization, structure and regulation of genes.
Recent advances in genomics technology have allowed the isolation of genes that
are associated with specific diseases. Expression of these genes may pre-dispose
individuals to develop certain diseases or may be responsible for initiating the
disease process. Development of techniques useful in determining gene structure
has led to an increased focus on determining a specific gene's function, known
as "functional genomics." Functional genomics refers to a set of gene discovery
techniques that allow identification of function at the time a specific gene is
discovered. GenQuest's technology includes three major discovery approaches: (i)
rapid expression cloning systems that identify genes that are only expressed
when normal cells become malignant cells; (ii) surface epitope masking that
identifies genes that are uniquely expressed on the surface of cancer cells; and
(iii) differentiation induction and subtractive hybridization -- a technique
that identifies genes that are expressed when cancer cells are forced to revert
to normal cells. The Company has rights to these and other technologies for the
purpose of discovering additional cancer vaccine antigens.
 
     In December 1996, the Company and GenQuest entered into a series of
collaborative agreements amending the original license and research
collaboration agreement entered into in February 1996. Under the
 
                                       39
<PAGE>   41
 
   
amended license and collaboration agreement, GenQuest agreed to provide an
aggregate of $5.7 million in research funding over a three-year period to
support the Company's program to discover cancer genes, related antigens and
cancer-related gene products. The Company granted GenQuest an exclusive
worldwide license to certain of Corixa's existing non-vaccine technology and
technology developed by Corixa under the joint research program in the field of
cancer diagnostics and non-vaccine cancer therapeutics. GenQuest granted Corixa
an exclusive worldwide license to GenQuest's existing technology and technology
developed under the joint research program in the field of cancer vaccines and
ex vivo cell therapy of cancer. Both the Company and GenQuest agreed to pay
royalties on any sales of products incorporating licensed technology, except
that with respect to genes and gene products developed by GenQuest during the
funded research program, GenQuest is not obligated to pay any royalties to the
Company. In addition, the Company has agreed to assume remaining royalty
obligations of GenQuest to its licensor on products incorporating the licensed
technology. Either the Company or GenQuest may terminate the license agreement
within 30 days following December 31, 1997 if such party believes that the
scientific objectives of the corporate partnership have not been met. Under the
license agreement, there are limitations on the Company's ability to enter into
certain relationships outside its core business of vaccine technologies.
However, the Company does not believe such limitations are material. See
"Certain Transactions" and Note 9 of Notes to Financial Statements.
    
 
   
     The Company and GenQuest have also entered into a call option agreement
(the "Call Option Agreement") under which the Company has the right to purchase
a significant majority of the outstanding shares of GenQuest's capital stock in
exchange for shares of the Company's Common Stock at a purchase price determined
in accordance with the formula specified in the Call Option Agreement. The right
becomes effective on the earlier of (i) June 23, 1998, (ii) the completion of a
30-day trading period following the Company's initial public offering during
which the average closing sale price of a share of the Company's Common Stock is
at least $19.80, or (iii) a merger of Corixa with another entity or a sale of
substantially all of Corixa's assets. Corixa's right to purchase the shares of
GenQuest capital stock terminates on the earlier of (i) January 23, 2000, (ii)
the date that the Company notifies GenQuest that it will not exercise its right,
(iii) the closing of the initial public offering of GenQuest, (iv) ten days
following the termination of the amended license agreement, or (v) ten days
following a merger of, a sale of assets by, or a change in control of Corixa.
The number of shares of Common Stock that Corixa is required to issue in order
to exercise the right is variable as the formula specified in the Call Option
Agreement takes into account the then-current fair market value of the Common
Stock and the capitalization of GenQuest as well as the date of exercise. Under
this formula, the value allocated to a share of Common Stock for the purpose of
determining the number of shares issuable upon exercise of this right is equal
to the greater of (i) the sum of $3.00 plus the quotient obtained by dividing
the difference between (a) the average closing sale price of a share of Common
Stock during the 30 trading days immediately prior to such exercise and (b)
$3.00 by 2, and (ii) the product of the average closing sale price of a share of
Common Stock during the 30 trading days immediately prior to such exercise
multiplied by 0.7. The value allocated to the shares of the capital stock of
GenQuest for the purpose of determining the purchase price of such capital stock
increases ratably on a monthly basis, up to a maximum allocated price per share,
based on the length of time the right remains outstanding. The purchase price
initially allocated to the GenQuest Series B preferred stock is $1.00 per share
and increases by approximately $0.04 per month until the right is exercised, up
to a maximum of $2.00 per share. The purchase price allocated to the GenQuest
Series A preferred stock and common stock is equal to 66 2/3% of the purchase
price of the GenQuest Series B preferred stock. For example, if the Company were
to exercise such right on June 23, 1998, assuming the then-current fair market
value of the Common Stock is $13.00 per share and assuming no changes to
GenQuest's capitalization in the interim, the Company would be obligated to
issue an aggregate of approximately 4,063,460 shares of Common Stock in exchange
for such outstanding shares of GenQuest's capital stock, which amount would
represent beneficial ownership of approximately 27% of the Common Stock of the
Company (based upon 10,994,331 shares of Common Stock to be outstanding upon
completion of the Offering). Because the actual number of shares of Common Stock
that the Company is obligated to issue upon exercise of the right is dependent
upon the variables described above, the number of shares of Common Stock that
Corixa would be obligated to issue and the resulting dilution to existing
stockholders of Corixa may be substantially greater or less than that set forth
in the example above. As of the date of this Prospectus, Corixa has not made a
decision as to whether it will exercise this right. In connection with the
    
 
                                       40
<PAGE>   42
 
relationship between Corixa and GenQuest, Corixa issued warrants to purchase up
to 454,533 shares in the aggregate of Corixa's Series B Preferred Stock at an
exercise price of $9.90 per share. The holders of such warrants or their
transferees (subject to certain conditions) are entitled to certain rights with
respect to the registration of the shares of Common Stock issuable upon exercise
of such warrants. See "Certain Transactions -- GenQuest, Inc." and "Description
of Capital Stock."
 
CERTAIN LICENSE AGREEMENTS
 
     The Company seeks to obtain technologies that complement and expand its
existing technology base. Where consistent with its strategy, the Company has
licensed and intends to continue to license product and marketing rights from
selected research and academic institutions in order to capitalize on the
capabilities and technology bases of these entities. Under these license
agreements, the Company generally seeks to obtain unrestricted sublicense rights
consistent with its partner-driven strategy. The Company is generally obligated
under these agreements to diligently pursue product development, make
development milestone payments and pay royalties on any product sales.
 
     Agreements with Southern Research Institute
 
   
     In May 1996, the Company entered into a license agreement with SRI. Under
the license agreement, SRI granted the Company an exclusive, worldwide,
sublicensable license (subject to the rights of certain United States
governmental agencies and a grant-back to SRI for non-commercial research
purposes) to certain polymer microsphere technology for use in the fields of
cancer and infectious disease, to the extent a product incorporates an antigen,
cytokine or adjuvant owned or controlled by Corixa. In addition, SRI granted the
Company options to exclusive, worldwide, sublicensable licenses in certain
autoimmune and viral disease fields. The Company paid up-front license fees upon
execution of the license agreement. The Company is also obligated to make future
payments upon the achievement of certain development milestones, as well as
royalty payments on any product sales, subject to an annual minimum royalty. In
addition, the Company issued SRI 15,151 shares of Common Stock upon execution of
the license agreement and a warrant exercisable for 7,575 shares for each grant
of sublicense rights to a third party, up to a maximum of 37,875 shares, and
7,575 shares for initiation of each Phase III clinical trial, up to a maximum of
37,875 shares. In April 1997, the parties amended the license agreement to
extend the Company's license in the field of cancer to include products that
incorporate third-party antigens or cytokines. The Company is obligated to share
revenues from such third-party sublicense agreements with SRI. The Company
issued SRI 4,545 shares of Common Stock upon the first anniversary of the
effective date of the license agreement. SRI may terminate the license agreement
in the event the Company fails to perform certain obligations under such
agreement.
    
 
     Additionally, in January 1995, the Company entered into a research
agreement with SRI. Under the research agreement, the Company agreed to fund
certain research at SRI directed at the incorporation of the Company's
proprietary antigens and/or adjuvants with SRI's microsphere technology. Rights
to any related discoveries made or obtained during the funded research are
subject to the license agreement between SRI and Corixa. The Company is
obligated to provide funding to SRI under the research agreement through 1997.
 
     Agreement with Dana-Farber Cancer Institute
 
     In January 1995, Corixa entered into a licensing agreement with
Dana-Farber. Under the licensing agreement, Dana-Farber granted the Company an
exclusive, worldwide, sublicensable license (subject to the rights of certain
United States governmental agencies and a grant-back to Dana-Farber for
non-commercial research purposes) to certain microsphere technology related to
the induction of a CTL response for use in all fields. The Company paid up-front
license fees upon execution of the licensing agreement. The Company is also
obligated to make future payments upon the achievement of certain development
milestones, as well as royalty payments on any product sales, subject to an
annual minimum royalty. In addition, the Company issued Dana-Farber 15,151
shares of Common Stock upon execution of the licensing agreement and agreed to
issue an additional 15,151 shares of Common Stock upon issuance of the first
patent containing claims covering the licensed technology. The Company must meet
certain performance obligations in order to retain their rights under the
licensing agreement. Dana-Farber may terminate the licensing agreement in the
event
 
                                       41
<PAGE>   43
 
the Company does not make required royalty payments or fails to perform certain
obligations under such agreement.
 
     Agreement with the University of Pittsburgh
 
     Corixa has an exclusive worldwide license to intellectual property
developed by a Corixa founder and consultant and the University of Pittsburgh
relating to the discovery and development of a Muc-1 peptide vaccine for use in
the diagnosis and therapy of cancer. Muc-1 is the name of a protein that is
present on the surface of ductal epithelial tissue cells. Epithelial cells are
located in tissues throughout the body, including lung, ovary, breast,
pancreatic, colon and prostate tissues. When expressed by a normal epithelial
cell, the portion of the Muc-1 protein outside the cell is covered with
carbohydrates, which serve to hide the underlying protein from the immune
system. When epithelial cells turn into epithelial cancer cells, the Muc-1
protein on the surface of such cells is only slightly covered with
carbohydrates. This allows T cells to recognize the underlying peptide sequence
of the Muc-1 protein. Work conducted by the Corixa founder and consultant at the
University of Pittsburgh confirmed that T cells obtained from cancer patients
specifically recognized a repetitive peptide sequence within Muc-1.
 
     In an early safety trial conducted by the University of Pittsburgh pursuant
to a sponsored research arrangement between the University and the Company, a
total of 60 breast, pancreatic and colon cancer patients whose tumors expressed
the Muc-1 antigen received escalating doses of the Muc-1 peptide vaccine
formulated in a commercially available adjuvant. The clinical trial confirmed
that vaccination of cancer patients was well-tolerated. While the Company did
not observe a level of efficacy sufficient to support product development, it
has agreed to fund a limited second dose-ranging Phase I clinical trial to be
conducted at the University of Pittsburgh. In addition, the Company is aware of,
but not participating in or sponsoring, an early-stage clinical trial currently
being conducted in Germany. See "Risk Factors -- Uncertainties Related to
Technology and Product Development."
 
     Agreement with Infectious Disease Research Institute
 
     In September 1994, the Company entered into a research services and
intellectual property agreement with IDRI, a not-for-profit, grant-funded
private research institute. Under this agreement, as amended and restated
effective January 1997, the Company has agreed to provide IDRI with research
funding and certain administrative and facilities support, including use of the
Company's research laboratory space. IDRI pays a services fee for the
administrative and facilities support provided by the Company. The Company's
funded research performed by IDRI is in the area of infectious disease. Under
the agreement, IDRI is obligated to disclose to the Company all significant
developments relating to information or inventions discovered at IDRI, and the
Company will own, on a royalty-free basis, all of IDRI's interest in inventions
and patent rights arising out of IDRI's research during the term of the
agreement (other than inventions and patent rights arising out of research that
is or in the future may be funded by certain governmental or not-for-profit
organizations). With respect to such rights arising out of research funded by
governmental and not-for-profit organizations, the Company has been granted a
royalty-bearing, worldwide, perpetual license, exclusive except as to rights
held by such governmental or not-for-profit organizations.
 
     IDRI is independent of the Company, and the Company does not have the right
to control or direct IDRI's activities. A majority of the members of IDRI's
board of directors are not affiliated with the Company. However, the Company's
Chief Scientific Officer is co-founder and a member of the board of directors of
IDRI. The Company's Chief Operating Officer is also a member of the board of
directors of IDRI and the Company's Vice President of Finance and Administration
is treasurer of IDRI.
 
     The research services and intellectual property agreement terminates on
December 31, 1999, subject to renewal for one or more three year terms at the
option of the Company. If IDRI terminates the agreement as a result of the
Company's failure to make required payments, the Company would be obligated to
pay royalties on any product sales. See "Certain Transactions."
 
                                       42
<PAGE>   44
 
     Other License Agreements
 
     Additionally, the Company is a party to certain other option or license
agreements useful in vaccine formulation and delivery with academic
institutions, including an exclusive license agreement with the University of
Washington for the use of Her-2/neu technology in all fields. The Company is
also a party to option or license agreements useful in its antigen discovery
program, including agreements with (i) Washington University in St. Louis,
Missouri for the use of mammaglobin, a breast cancer-related protein and genes
for prophylactic and therapeutic treatment of adenocarcinoma, (ii) Health
Research, Inc. for the use of a proprietary mouse model for all cancer fields,
and (iii) Mayo Foundation for Medical Education and Research for use of
tick-borne disease antigens. Certain of these agreements require the Company or
other parties to meet certain performance obligations in order to retain their
rights under such agreements or require the Company to make certain payments in
order to obtain or maintain rights to the subject technology.
 
CORIXA'S VACCINE ANTIGEN DISCOVERY METHODOLOGIES
 
     Tumor Tissue Procurement and SCID Mouse Tumor Propagation. Corixa has
developed a variety of unique and proprietary resources that provide the Company
with sufficient tumor tissue to enable it to conduct the types of immunological
and molecular biological research it believes are necessary for antigen
discovery. Many scientific organizations, universities and pharmaceutical and
biotechnology companies are actively pursuing the identification of gene
products that are uniquely expressed in tumor tissue. Such gene products can
form the basis not only of vaccines, but also diagnostic and therapeutic product
development. Access to large amounts of tumor tissue is therefore one of the
keys to success in this area of research. Although many people in the United
States suffer from cancer, large quantities of tumor tissue are not readily
available due to increasing early detection. In order to gain access to
sufficient tumor tissue, the Company uses (i) agreements with multiple clinical
and academic centers in the United States and South America for provision of
tumor tissue, sera and lymphocytes obtained from cancer patients; and (ii) a
proprietary system for growing tumors of multiple types from primary biopsy
specimens in mice that are genetically pre-disposed to lack an immune system
(severe combined immune deficient ("SCID") mice). SCID mice lack an immune
response and therefore are incapable of rejecting transplanted human tumor
tissues. Tumors can be transplanted and grown in multiple numbers of SCID mice,
thereby providing a stable source of tumor tissue for use in antigen discovery.
In addition, small numbers of lymphocytes present in primary biopsy specimens
continue to grow within SCID mice transplanted with biopsy tumors, serving as a
reservoir for generation of tumor reactive T cell lines and clones as well as
antibody-producing B cells.
 
     Differential Display. Corixa has used differential display techniques to
identify hundreds of gene sequences that are uniquely expressed or
over-expressed by tumors. This approach allows investigators to compare genes
that are expressed in different cell types simultaneously. In tumor antigen
discovery, cells are obtained from both tumor and normal tissue from individual
cancer patients. Messenger RNA (genetic information from genes that are
expressed) is prepared from both cell types and converted into DNA (called
"cDNA"). Multiple cDNA(s) are then separated from each other on the basis of
their size. Patterns of cDNA expression from tumor and normal cells are then
compared, leading to identification of cDNA(s) that are either uniquely
expressed or dramatically over-expressed in tumor cells. The sequence of nucleic
acids (the individual component molecules of DNA) in such cDNA(s) can be
determined and that information used to isolate genes from such cDNA. The
protein products of such genes then can be tested in laboratory experiments to
determine whether they can function as stimulators of immune responses in cancer
patients. Positive results from such studies indicate that such proteins are
good candidates for inclusion in tumor vaccines.
 
     cDNA Subtraction. Corixa has used cDNA subtraction to identify genes that
are uniquely expressed or over-expressed by prostate tumors and prostate tissue.
cDNA subtraction is another molecular biology technique that allows
investigators to identify genes that are expressed in one type of tissue and not
expressed in another type of tissue. The technique takes advantage of the
ability of single strands of cDNA from identical or closely related genes to
bind to each other and form a complex. In tumor antigen discovery, cDNA(s)
(representing populations of expressed genes) obtained from normal tissue are
mixed with cDNA populations harvested from tumor tissue. cDNAs from genes that
are shared between both tissues form
 
                                       43
<PAGE>   45
 
complexes and can be eliminated from further analysis. Remaining cDNA(s)
representing genes expressed only in tumor tissue or only in normal tissue then
can be separated and further analyzed. The goal of such experimentation is to
identify those genes that are expressed only in tumor cells. The protein
products of such genes then can be tested in laboratory experiments to determine
whether they can function as stimulators of immune responses in cancer patients.
Positive results from such studies indicate that such proteins are good
candidates for inclusion in tumor vaccines.
 
     Expression Cloning. Corixa also uses expression cloning methods to identify
potential tumor antigens for incorporation into candidate tumor vaccines. The
Company has developed a number of proprietary improvements in expression cloning
technology. This mode of experimentation requires use of either antibodies or
immune T cells harvested from cancer or infectious disease patients. In
antibody-mediated expression cloning, genes from pathogenic organisms or tumors
are transferred into clones of bacteria in a system that will promote expression
of all transferred genes into corresponding proteins. Because of the bacteria's
rapid growth rate and capacity for protein production, pathogen or tumor
proteins are produced in significant quantity together with bacterial proteins.
These proteins are screened for their ability to react with antibody from either
pathogen-infected or cancer patients. The development of a positive
protein-antibody reaction indicates that the gene that encodes the antigen is
present in a single bacterial clone. Because CTL are felt to be extremely
important in mounting an effective immune response against tumors, tumor antigen
expression cloning studies focus on the use of CTL for discovery of antigens by
direct expression cloning. The Company has developed multiple tumor reactive CTL
lines and clones for such experimentation.
 
     Pathogen Protein Purification. Corixa uses protein purification techniques
to obtain candidate antigens from specific pathogens. Proteins are prepared from
a given pathogenic organism and separated based on their physical
characteristics such as size, electric charge and shape. Individual proteins are
then tested for their ability to stimulate appropriate T-helper lymphocyte
responses in vitro. Lymphocytes used in this screening process are obtained from
individuals who are infected with the pathogen but lack evidence of disease
(i.e., immune patients). Proteins that trigger helper T cell responses are then
purified to homogeneity and their precise amino acid sequence is determined. The
amino acid sequence information is then used to isolate the gene that encodes
the particular protein.
 
     Antigenic Peptide Stripping. Most cells in the human body express MHC
proteins on their surface. The same MHC proteins are expressed on the surface of
all tissue cells within a given individual. One function of MHC proteins is to
attract and bind small peptide antigens. The complex between such peptides and
MHC proteins serves as a site of immunologic recognition by T cells. Many
different types of tumor cells also express MHC proteins. Corixa uses a
combination of biochemical techniques to purify MHC proteins and remove
antigenic peptides from the region of the MHC protein where they are bound. Such
peptides can then be purified using sophisticated peptide separation techniques,
and the purified peptides can then be sequenced using mass spectroscopy.
Comparison of such sequences with sequences of proteins from normal cells can
lead to the identification of proteins or peptides that are produced only by
tumor cells. The same sequence information can then be used to isolate the gene
that encodes this putative "tumor antigen."
 
     Immunological Characterization of Candidate Vaccine Antigens. The Company's
discovery techniques result in the cloning and characterization of multiple
genes for possible inclusion in tumor vaccines. A key component of Corixa's
antigen discovery technology is the ability to determine which of these gene
products can function as potent antigens for generating anti-tumor immune
responses. Once candidate antigen genes are identified, Corixa systematically
determines: (i) expression of the gene product by multiple tumors from different
individuals; (ii) expression of the gene product by primary as well as
metastatic tumor tissue; (iii) absence of expression of the gene product in
normal tissue; (iv) ability of the candidate tumor antigen to generate in vitro
immune responses from T cell populations harvested from tumor and normal
patients; (v) ability of the candidate tumor antigen to generate immune
responses in specially designed tumor models; and (vi) ability of T cells
stimulated by such antigens to mediate tumor regression in specially designed
tumor models. By such systematic evaluation of candidate antigens, Corixa is
able to determine and select which antigens are appropriate for microsphere
formulation and vaccine development.
 
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<PAGE>   46
 
PATENTS AND PROPRIETARY TECHNOLOGY
 
     The Company's success will depend in large part on the ability of the
Company and its licensors to obtain patent and other proprietary protection for
the Company's vaccine and diagnostic products, antigens and adjuvants, defend
patents once obtained, preserve its trade secrets and operate without infringing
the patents and proprietary rights of third parties both in the United States
and in foreign countries. Where appropriate, the Company intends to seek patent
protection for its vaccine, discovery, screening, diagnostic and other
proprietary technologies by filing patent applications in the United States and
certain other countries. As of June 30, 1997, the Company owned or had licensed
eight issued United States patents that expire at various times between December
2008 and February 2014, 55 corresponding issued foreign patents, 76 pending
United States patent applications, as well as 19 corresponding international
filings under the Patent Cooperation Treaty and 111 pending foreign national
patent applications. The Company also holds an option to exclusively license
cancer vaccine antigens discovered by GenQuest through December 2001.
 
     While the Company believes its patents and patent applications provide a
competitive advantage in its efforts to discover, develop and commercialize
useful vaccine and diagnostic products, antigens and adjuvants, the patent
positions of pharmaceutical and biopharmaceutical companies, including those of
the Company, are highly uncertain and involve complex legal and factual
questions for which important legal principles are unresolved. There can be no
assurance that the Company, its corporate partners or its licensors have or will
develop or obtain rights to products or processes that are patentable, that
patents will issue from any of the pending applications owned or licensed by the
Company or its corporate partners, that any claims allowed will issue, or in the
event of issuance, will be sufficient to protect the technology owned by or
licensed to the Company or its corporate partners. The Company has licensed
certain patent applications from SRI related to the Company's microsphere
encapsulation technology, one of which is currently the subject of an opposition
proceeding before the European Patent Office. There can be no assurance that SRI
will prevail in this opposition proceeding or that any patents will issue in
Europe related to such technology. There can also be no assurance that the
Company's or its corporate partners' current patents, or patents that issue on
pending applications, will not be challenged, invalidated, infringed or
circumvented, or that the rights granted thereunder will provide proprietary
protection or competitive advantages to Corixa. Patent applications in the
United States are maintained in secrecy until patents issue, patent applications
in certain foreign countries are not generally published until many months or
years after they are filed, and publication of technological developments in the
scientific and patent literature often occur long after the date of such
developments. Accordingly, the Company cannot be certain that it or one of its
corporate partners was the first to invent the subject matter covered by any
patent application or that it or one of its corporate partners was the first to
file a patent application for any such invention.
 
     The commercial success of the Company depends significantly on its ability
to operate without infringing patents and proprietary rights of third parties,
and there can be no assurance that the Company's and its corporate partners'
technologies do not or will not infringe the patents or proprietary rights of
others. A number of pharmaceutical companies, biotechnology companies,
universities and research institutions may have filed patent applications or may
have been granted patents that cover technologies similar to the technologies
owned, optioned by or licensed to the Company or its corporate partners. In
addition, the Company is unable to determine the patents or patent applications
that may materially affect the Company's or its corporate partners' ability to
make, use or sell any products. The existence of third-party patent applications
and patents could significantly reduce the coverage of the patents owned,
optioned by or licensed to the Company or its corporate partners and limit the
ability of the Company or its corporate partners to obtain meaningful patent
protection. If patents containing competitive or conflicting claims are issued
to third parties, the Company or its corporate partners may be enjoined from
pursuing research, development or commercialization of products or be required
to obtain licenses to these patents or to develop or obtain alternative
technology. There can be no assurance that the Company or its corporate partners
will not be so enjoined or will be able to obtain any license to the patents and
technologies of third parties on acceptable terms, if at all, or will be able to
obtain or develop alternative technologies. If the Company or any of its
corporate partners is enjoined from pursuing its research, development or
commercialization activities or if any such license is or alternative
technologies are not obtained or developed, the Company or such corporate
 
                                       45
<PAGE>   47
 
partner may be delayed or prevented from commercializing its products, which
would have a material adverse effect on the Company's business, financial
condition and results of operations.
 
     There can be no assurance that third parties will not independently develop
similar or alternative technologies to those of the Company, duplicate any of
the technologies of the Company, its corporate partners or its licensors, or
design around the patented technologies developed by the Company, its corporate
partners or its licensors. The occurrence of any of these events would have a
material adverse effect on the Company's business, financial condition and
results of operations.
 
     Litigation may also be necessary to enforce patents issued or licensed to
the Company or its corporate partners or to determine the scope or validity of a
third party's proprietary rights. Corixa could incur substantial costs if
litigation is required to defend itself in patent suits brought by third
parties, if Corixa participates in patent suits brought against or initiated by
its corporate partners or if Corixa initiates such suits, and there can be no
assurance that funds or resources would be available to the Company in the event
of any such litigation. Additionally, there can be no assurance that the Company
or its corporate partners would prevail in any such action. An adverse outcome
in litigation or an interference to determine priority or other proceeding in a
court or patent office could subject the Company to significant liabilities,
require disputed rights to be licensed from other parties or require the Company
or its corporate partners to cease using certain technology, any of which may
have a material adverse effect on the Company's business, financial condition
and results of operations.
 
     Corixa also relies on trade secrets and proprietary know-how, especially in
circumstances where patent protection is not believed to be appropriate or
obtainable. The Company's policy is to require each of its employees,
consultants and advisors to execute a confidentiality agreement upon the
commencement of any employment, consulting or advisory relationship with the
Company. These agreements generally provide that all confidential information
developed or made known to the individual during the course of such relationship
will be kept confidential and not disclosed to third parties except in specified
circumstances. These agreements also generally provide that all inventions
conceived by the individual in the course of rendering services to the Company
shall be the exclusive property of the Company. There can be no assurance,
however, that these agreements will provide meaningful protection or adequate
remedies for any breach, or that the Company's trade secrets will not otherwise
become known or be independently discovered by its competitors, any of which
could have a material adverse effect on the Company's business, financial
condition and results of operations.
 
     The Company is a party to various license agreements that give it rights to
use certain technologies in its research, development and commercialization
activities. Disputes may arise as to the inventorship and corresponding rights
in know-how and inventions resulting from the joint creation or use of
intellectual property by the Company and its corporate partners, licensors,
scientific collaborators and consultants. There can be no assurance that the
Company will be able to maintain its proprietary position or that third parties
will not circumvent any proprietary protection the Company does have. The
failure of the Company to maintain exclusive or other rights to such
technologies could have a material adverse effect on the Company's business,
financial condition and results of operations. See "Risk Factors -- Dependence
on Proprietary Technology and Uncertainty of Patent Protection."
 
GOVERNMENT REGULATION
 
     Regulation by governmental entities in the United States and other
countries will be a significant factor in the development, production and
marketing of any products developed by the Company or its corporate partners.
Pharmaceutical products and medical devices are subject to rigorous regulation
by the FDA in the United States and similar health authorities in foreign
countries under laws and regulations that govern, among other things, testing,
manufacturing, safety, efficacy, labeling, storage, record keeping, export and
promotion, marketing and distribution of such products. Product development and
approval within this regulatory framework is uncertain, can take a number of
years and requires the expenditure of substantial resources. Any failure to
obtain regulatory approval, or any delay in obtaining such approvals, could
adversely affect the marketing of products under development by the Company or
its corporate partners, the Company's ability to receive product or royalty
revenues, and its liquidity and capital resources.
 
                                       46
<PAGE>   48
 
     The nature and extent of the governmental premarket review process for the
Company's products will vary, depending on the regulatory categorization of
particular products. The Company believes that its vaccine and related
pharmaceutical products will be regulated as biologics by the FDA and comparable
regulatory bodies in other countries. The necessary steps before a new
biological product may be marketed in the United States ordinarily include: (i)
preclinical laboratory tests and in vivo preclinical studies; (ii) the
submission to the FDA of an investigational new drug application ("IND"), which
must become effective before clinical trials may commence; (iii) adequate and
well-controlled clinical trials to establish the safety and efficacy of the
product; (iv) the submission to the FDA of a product license application and
establishment license application ("PLA/ELA"); and (v) FDA review and approval
of the PLA/ELA prior to any commercial sale or shipment of the product.
Recently, the FDA has eliminated the separate ELA requirement for certain
categories of biotechnology products and has indicated that it intends to adopt
regulations permitting the premarket review of all biologics under a single
biologics license application. However, it is impossible predict when this new
procedure will become effective or its impact upon the regulatory review of the
Company's biological products.
 
     Preclinical tests include laboratory evaluation of the product, as well as
animal studies to assess the potential safety and efficacy of the product.
Preclinical tests must be conducted by laboratories that comply with FDA
regulations regarding good laboratory practices. The results of preclinical
tests, together with manufacturing information and analytical data, are
submitted to the FDA as part of an IND, which must become effective before the
commencement of clinical trials. The IND will automatically become effective 30
days after receipt by the FDA unless the FDA indicates prior to the end of such
30-day period that the proposed protocol raises concerns that must be resolved
to the satisfaction of the FDA before the trials may proceed as outlined in the
IND. In such case, there can be no assurance that such resolution will be
achieved in a timely fashion, if at all. In addition, the FDA may impose a
clinical hold on an ongoing clinical trial, if, for example, safety concerns are
presented, in which case the study cannot recommence without FDA authorization
under terms sanctioned by the agency.
 
     Clinical trials involve the administration of the product to healthy
volunteers or to patients under the supervision of a qualified principal
investigator. Clinical trials are conducted in accordance with good clinical
practices under protocols that detail the objectives of the trial, inclusion and
exclusion criteria, the parameters to be used to monitor safety and the efficacy
criteria to be evaluated. Each protocol must be submitted to the FDA as part of
the IND. Further, each clinical trial must be reviewed and approved by an
independent institutional review board ("IRB") at the institutions at which the
trial will be conducted. The IRB will consider, among other things, ethical
factors and the safety of human subjects. The IRB may require changes in a
protocol, and there can be no assurance that the submission of an IND will
enable a study to be initiated or completed.
 
     Clinical trials generally are conducted in three sequential phases, but the
phases may overlap. In Phase I, the initial introduction of the product into
healthy human subjects or patients, the product is tested to assess safety,
metabolism, pharmacokinetics and pharmacological actions associated with
increasing doses. Phase II usually involves studies in a limited patient
population to (i) determine the efficacy of the potential product for specific,
targeted indications, (ii) determine dosage tolerance and optimum dosage and
(iii) further identify possible adverse reactions and safety risks. If a
compound is found to be effective and to have an acceptable safety profile in
Phase II evaluations, Phase III trials are undertaken to evaluate further
clinical efficacy and to test further for safety within a broader patient
population, generally at geographically dispersed clinical sites. There can be
no assurance that Phase I, Phase II or Phase III testing will be completed
successfully within any specific period of time, if at all, with respect to any
of the Company's products subject to such testing. In addition, after marketing
approval is granted, the FDA may require post-marketing clinical studies, which
typically entail extensive patient monitoring and may result in restricted
marketing of an approved product for an extended period of time.
 
     The results of pharmaceutical development, preclinical studies and clinical
trials are submitted to the FDA in the form of a PLA/ELA for approval of the
manufacture, marketing and commercial shipment of the biological product. The
testing and approval process is likely to require substantial time, effort and
resources, and there can be no assurance that any approval will be granted on a
timely basis, if at all. The FDA may deny
 
                                       47
<PAGE>   49
 
the PLA/ELA if applicable regulatory criteria are not satisfied, require
additional testing or information, or require postmarket testing and
surveillance to monitor the safety or efficacy of the product.
 
     Any diagnostic products developed by the Company or its corporate partners
are likely to be regulated as medical devices. In the United States, medical
devices are classified into one of three classes on the basis of the controls
deemed by the FDA to be necessary to reasonably ensure their safety and
effectiveness: Class I (general controls -- e.g., labeling, premarket
notification and adherence to GMP), Class II (general controls and special
controls -- e.g., performance standards and postmarket surveillance) and Class
III (premarket approval).
 
     Before a new device can be introduced into the market, its manufacturer
generally must obtain marketing clearance through either a premarket clearance
under Section 510(k) of the federal Food, Drug and Cosmetic Act ("510(k)") or
approval of a premarket approval application ("PMA"). Because the Company
believes that any diagnostic device developed by it or its corporate partners
would be classified as a Class III device, such product would be subject to the
PMA approval requirement. A 510(k) clearance typically will be granted if a
company establishes that its device is "substantially equivalent" to a legally
marketed Class I or II medical device or to a Class III device for which the FDA
has not yet required the submission of PMAs. A 510(k) clearance must contain
information to support the claim of substantial equivalence, which may include
laboratory test results or the results of clinical studies. Commercial
distribution of a device subject to the 510(k) requirement may begin only after
the FDA issues an order finding the device to be substantially equivalent to a
predicate device. It generally takes from four to 12 months from the date of
submission to obtain clearance of a 510(k) submission, but it may take longer.
The FDA may determine that a proposed device is not substantially equivalent to
a legally marketed device, that additional information is needed before a
substantial equivalence determination may be made, or that the product may be
approved through the PMA process. An FDA determination of "not substantially
equivalent," a request for additional information, or the requirement of PMA
approval could delay marketed introduction of products that fall into this
category. Furthermore, for any devices cleared through the 510(k) process,
modifications or enhancements that could significantly affect safety or
effectiveness, or constitute a major change in the intended use of the device,
will require new 510(k) submissions.
 
     If a device does not qualify for the premarket notification procedure, a
company must file a PMA. The PMA requires more extensive pre-filing testing than
required for a 510(k) premarket notification and usually involves a
significantly longer review process. A PMA application must be supported by
valid scientific evidence that typically includes extensive data, including
preclinical and clinical trial data, to demonstrate that safety and efficacy of
the device. If clinical trials are required, and the device presents a
"significant risk," an investigation device exemption ("IDE") application must
be filed with the FDA and become effective prior to the commencement of clinical
trials. If the device presents a "nonsignificant risk" to trial subjects,
clinical trials may begin on the basis of appropriate IRB approval. Clinical
investigation of medical devices may involve risks similar to those involved in
the clinical investigation of pharmaceutical products.
 
     The PMA application must contain the results of clinical trials and
nonclinical tests, a complete description of the device, and a detailed
description of the methods, facilities and controls used to manufacture the
device. The PMA review and approval process can be expensive, uncertain and
lengthy, and there can be no assurance that any approval will be granted on a
timely basis, if at all. A PMA application may be denied if applicable
regulatory criteria are not satisfied, and the FDA may impose certain conditions
upon the applicant, such as postmarket testing and surveillance.
 
     Regulatory approval, if granted for any biopharmaceutical or medical device
product, may entail limitations on the indicated uses for which it may be
marketed, and product approvals, once granted, may be withdrawn if problems
occur after initial marketing. Manufacturers of FDA-regulated products are
subject to pervasive and continuing governmental regulation, including record
keeping requirements and reporting of adverse experiences associated with
product use. The Company and its corporate partners will be required to adhere
to applicable regulations setting forth detailed GMP requirements, which include
testing, control and documentation requirements. The FDA has recently issued
significant revisions to its medical device GMP regulations, and future changes
in regulatory regulations could have a material adverse effect on the Company's
business, financial condition and results of operations. Manufacturing
facilities in the United
 
                                       48
<PAGE>   50
 
States are subject to periodic inspection by the FDA Failure to comply with GMP
and other applicable regulatory requirements may result in, among other things,
warning letters, fines, injunctions, civil penalties, recall or seizure of
products, total or partial suspension of production, failure of the government
to review pending marketing approval applications, withdrawal of marketing
approvals and criminal prosecution.
 
     For clinical investigation and marketing of products outside the United
States, the Company and its corporate partners may be subject to regulation by
regulatory authorities in other countries. The requirements governing the
conduct of clinical trials, marketing authorization and pricing and
reimbursement vary widely from country to country. The regulatory approval
process in other countries entails risks similar to those associated with FDA
approval.
 
     The Company's research and development activities involve the controlled
use of hazardous materials, chemicals and various radioactive materials. The
Company is subject to federal, state and local laws and regulations governing
the use, storage, handling and disposal of such materials and certain waste
products. Although the Company believes that its safety procedures for using,
handling, storing and disposing of such materials comply with the standard
prescribed by state and federal laws and regulations, the risk of accidental
contamination or injury from these materials cannot be completely eliminated. In
the event of such an accident, the Company's use of these materials could be
curtailed by state or federal authorities, the Company could be held liable for
any damages that result and any liability could exceed the resources of the
Company. See "Risk Factors -- Government Regulation."
 
COMPETITION
 
     The biotechnology and biopharmaceutical industries are characterized by
rapidly advancing technologies, intense competition and a strong emphasis on
proprietary products. Many entities, including pharmaceutical and biotechnology
companies, academic institutions and other research organizations are actively
engaged in the discovery, research and development of products that could
compete directly with products the Company is seeking to develop. Many companies
are also developing alternative therapies to treat cancer and infectious disease
and, in this regard, are competitive with the Company. Many of the entities
developing and marketing such competing products have significantly greater
financial resources and expertise in research and development, manufacturing,
preclinical testing, conducting clinical trials, obtaining regulatory approvals
and marketing than Corixa. In addition, many of these competitors have become
more active in seeking patent protection and licensing arrangements in
anticipation of collecting royalties for use of technology that they have
developed. Smaller companies may also prove to be significant competitors,
particularly through collaborative arrangements with large and established
companies. These companies and institutions compete with the Company in
recruiting and retaining qualified scientific and management personnel, as well
as in acquiring technologies complementary to the Company's programs. The
Company's ability to compete effectively will depend on its ability to advance
its core technologies, license additional technology, maintain a proprietary
position in its technologies and products, obtain required government and other
public and private approvals on a timely basis, attract and retain key personnel
and enter into corporate partnerships that enable the Company and its corporate
partners to develop effective products that can be manufactured cost-effectively
and marketed successfully. The Company expects that competition among products
approved for sale will be based, among other things, on efficacy, reliability,
product safety, price and patent position. There can be no assurance that
competitors will not develop more effective or more affordable products, or
achieve earlier patent protection or product commercialization than the Company
or that such products will not render the Company's products obsolete. See "Risk
Factors -- Intense Competition."
 
EMPLOYEES
 
     As of June 30, 1997, the Company employed 82 personnel, including 68 in
research and development (29 in antigen discovery, 18 in immunology, 11 in
vaccine research and 10 in research and development support) and 14 in
administration. Each of the Company's employees has signed a confidentiality
agreement and none are covered by a collective bargaining agreement. The Company
has never experienced employment-related work stoppages and considers its
employee relations to be good.
 
                                       49
<PAGE>   51
 
PROPERTIES
 
     Corixa maintains its headquarters in Seattle, Washington where it leases
approximately 35,416 square feet of laboratory, discovery, research and
development, manufacturing and general administration space. The lease for this
facility expires in January 2005, with an option to renew the lease for two
additional periods of five years each. As of June 30, 1997 the Company's monthly
rent was approximately $129,000. The Company believes that its existing
facilities are adequate to meet its immediate needs and that suitable additional
space will be available in the future on commercially reasonable terms as
needed.
 
LEGAL PROCEEDINGS
 
     As of the date of this Prospectus, the Company is not a party to any
material legal proceedings.
 
SCIENTIFIC COLLABORATORS
 
     The Company has established a network of medical, clinical and scientific
advisors and collaborators to consult with the Company's scientists and to
advise the Company on its research and development program, the design of its
clinical trials and on other medical and scientific matters relating to the
Company's business. The Company's advisors and collaborators include the
following individuals:
 
     Roberto Badaro, M.D. is an Associate Professor and Chief of the Infectious
Disease Research Unit at the Federal University of Bahia in Salvador, Bahia,
Brazil, and a Member of the Steering Committee of Integrated Chemotherapy and
Vaccine for Leishmaniasis for the World Health Organization in Geneva,
Switzerland. Dr. Badaro collaborates with the Company in a tuberculosis skin
testing program and a cancer-related tissue procurement program, each of which
is conducted in Brazil.
 
     Martin Cheever, M.D. is a Professor of Medicine at the University of
Washington in Seattle, Washington and a co-founder of the Company. Dr. Cheever
collaborates with the Company in its research and development program focusing
on the use of Her-2/neu technology in vaccines for breast cancer. Dr. Cheever is
the inventor of Her-2/neu peptide-based vaccines for potential use in breast and
ovarian cancer.
 
     Nora Disis, M.D. is an Assistant Professor of Medicine at the University of
Washington in Seattle, Washington. Dr. Disis collaborates with the Company in
its research and development program focusing on the use of Her-2/neu technology
in vaccines for breast cancer. Dr. Disis is the principal investigator on the
Phase I clinical trial currently being conducted by the Company and the
University of Washington using Her-2/neu peptide vaccines for breast cancer.
 
     Olivera Finn, Ph.D. is a Professor of Molecular Genetics and Biochemistry
at the University of Pittsburgh School of Medicine, Director of the Immunology
Program at the University of Pittsburgh Cancer Institute in Pittsburgh,
Pennsylvania and a co-founder of the Company. Dr. Finn collaborates with the
Company in its research and development efforts focusing on the use of the Muc-1
peptide vaccine for the treatment of breast, pancreatic and colon cancer. Dr.
Finn is the inventor of the Muc-1 synthetic peptide vaccine that was the subject
of a Phase I clinical trial in breast, colon and pancreatic cancer recently
conducted by the University of Pittsburgh. Such vaccine is currently the subject
of a limited second dose-ranging clinical trial which is partly funded by the
Company and conducted by the University of Pittsburgh.
 
     Paul Fisher, Ph.D. is a Director of Neuro-Oncology Research, Professor of
Clinical Pathology and a Chernow Research Scientist in the Departments of
Neurosurgery, Pathology, and Urology at the College of Physicians and Surgeons
of Columbia University in New York City, New York. Dr. Fisher is a member of the
board of directors of GenQuest and collaborates with the Company in its research
and development program focusing on the discovery and characterization of
cancer-related genes.
 
     Richard Ostenson, M.D. is a Director of Research at Good Samaritan Cancer
Center. Dr. Ostenson collaborates with the Company in its vaccine development
program and supplies the Company with cancer cell lines and other materials used
in the Company's various research and development programs.
 
                                       50
<PAGE>   52
 
     David Persing, Ph.D., M.D. is an Associate Professor of Microbiology at the
Mayo Clinic's Department of Laboratory Medicine and Pathology in Rochester,
Minnesota. Dr. Persing collaborates with the Company in its tick-borne disease
programs.
 
     Elizabeth Repasky, Ph.D. is a Cancer Research Scientist with Roswell Park
Cancer Institute in Buffalo, New York. Dr. Repasky collaborates with the Company
in its tumor antigen development program and has licensed certain rights to a
proprietary mouse model.
 
     Kenneth Rock, M.D. is the Chairman of the Department of Pathology and a
Professor at the University of Massachusetts Medical Center in Worcester,
Massachusetts and a co-founder of the Company. Dr. Rock collaborates with the
Company in its research and development efforts focusing on the use of
microsphere delivery technology to stimulate a T cell response.
 
     Thomas Tice, Ph.D. is the Director, Pharmaceutical Formulations Department
at SRI in Birmingham, Alabama. Dr. Tice collaborates with the Company in its
formulations of microsphere-encapsulated antigens for vaccine research.
 
     James Watson, Ph.D. is the Scientific Director of the Genesis Research &
Development Corporation, Ltd. in Auckland, New Zealand. Dr. Watson collaborates
with the Company in its tuberculosis antigen discovery program and animal
testing.
 
     The Company has entered into consulting or sponsored research agreements
with its principal advisors and collaborators. Each of the Company's advisors
and collaborators has also entered into a confidentiality and non-disclosure
agreement with the Company. These advisors and collaborators are generally
employed by employers other than the Company and may have commitments to or
consulting or advisory contracts with other entities that may limit their
availability to the Company. Although generally each advisor and collaborator
agrees not to perform services for another person or entity which would create a
conflict of interest with the individual's services for the Company, there can
be no assurance that such conflict will not arise.
 
                                       51
<PAGE>   53
 
                                   MANAGEMENT
 
EXECUTIVE OFFICERS AND DIRECTORS
 
     The following table sets forth certain information with respect to the
executive officers and directors of the Company and their ages and positions as
of June 30, 1997:
 
<TABLE>
<CAPTION>
              NAME                AGE                          POSITION
- --------------------------------  ---     --------------------------------------------------
<S>                               <C>     <C>
Steven Gillis, Ph.D. ...........  44      President, Chief Executive Officer and Director
Mark McDade.....................  42      Executive Vice President, Chief Operating Officer
                                          and Director
Steven Reed, Ph.D. .............  46      Executive Vice President and Chief Scientific
                                          Officer
Kenneth Grabstein, Ph.D. .......  46      Vice President and Director of Immunology
Michelle Burris.................  31      Vice President of Finance and Administration
Syamal Raychaudhuri, Ph.D. .....  43      Vice President and Director of Vaccine Research
Joseph S. Lacob (1).............  41      Chairman of the Board of Directors
Arnold L. Oronsky, Ph.D. (2)....  56      Director
Andrew E. Senyei, M.D.(1)(2)....  47      Director
</TABLE>
 
- ---------------
 
(1) Member of Compensation Committee
(2) Member of Audit Committee
 
     STEVEN GILLIS, PH.D. has served as President and Chief Executive Officer of
Corixa since 1994. From 1996 to the present, Dr. Gillis has also served as
Acting Chief Executive Officer and a director of GenQuest. Dr. Gillis was a
founder of Immunex Corporation ("Immunex"), a biotechnology company. From 1981
to 1994, Dr. Gillis served as Executive Vice President and Director of Research
and Development of Immunex, and from 1993 to 1994, served as Acting Chief
Executive Officer and Chairman of the Board of Immunex. From 1990 to 1994, Dr.
Gillis also served as President and Chief Executive Officer of Immunex Research
and Development Corporation, a wholly owned subsidiary of Immunex, and Chief
Scientific Officer of Immunex. In addition, Dr. Gillis is a director of
Micrologix Biotech, Inc. Dr. Gillis serves on the Scientific Advisory Board of
Medarex Corporation. Dr. Gillis graduated from Williams College with a B.A. in
Biology and English in 1975 and received his Ph.D. in Biological Sciences from
Dartmouth College in 1978.
 
     MARK MCDADE has served as Executive Vice President and Chief Operating
Officer of Corixa since 1994. From 1996 to the present, Mr. McDade has also
served as Acting Vice President and a director of GenQuest. From 1993 to 1994,
Mr. McDade served as Chief Operating Officer of Boehringer Mannheim
Therapeutics, a pharmaceutical company, heading its worldwide pharmaceutical
operations. From 1991 to 1992, Mr. McDade was an independent consultant
providing business development and strategic consulting to a number of
biopharmaceutical and pharmaceutical companies. From 1983 to 1991, Mr. McDade
held various positions with Sandoz, Ltd., a pharmaceutical company. Mr. McDade
graduated from Dartmouth College with a B.A. in History in 1977 and received his
M.B.A. from Harvard University in 1984.
 
     STEVEN REED, PH.D. has served as Executive Vice President and Chief
Scientific Officer of Corixa since 1994. From 1993 to the present, Dr. Reed has
served as an Associate Professor of Pathobiology at the University of
Washington. From 1993 to the present, he served as a director of IDRI, which he
founded. From 1984 to the present, Dr. Reed has served as a Professor (Adjunct)
of Medicine at the Cornell University Medical College. From 1984 to 1993, Dr.
Reed served as a Senior Scientist at the Seattle Biomedical Research Institute.
Dr. Reed graduated from Whitman College with a B.A. in Biology in 1973 and
received his Ph.D. in Microbiology from the University of Montana in 1979.
 
     KENNETH GRABSTEIN, PH.D. has served as Vice President and Director of
Immunology of Corixa since 1994. From 1992 to 1994, Dr. Grabstein was Director
of Cellular Immunology and Director of the Flow Cytometry Facility at Immunex
Research and Development Corporation. From 1995 to the present, he has served as
Affiliate Investigator of the Clinical Research Division of the Fred Hutchinson
Cancer Research
 
                                       52
<PAGE>   54
 
Center. Dr. Grabstein graduated from the University of California, Berkeley with
a B.A. in Zoology in 1973 and received his Ph.D. in Immunology from the
University of California, Berkeley in 1982.
 
     MICHELLE BURRIS has served as Vice President of Finance and Administration
of Corixa since February 1997. From 1996 to February 1997, she was Director of
Finance and Administration of Corixa. From 1995 to 1996, she was Controller at
Corixa. Ms. Burris held several finance and planning positions at The Boeing
Company, an aerospace company, most recently serving as Manager of Planning and
Performance from 1994 to 1995 and Manager of Operations Planning from 1992 to
1994. Ms. Burris graduated from George Mason University with a B.S. in Marketing
and Statistics in 1987 and received her M.B.A. from Seattle University in 1991.
 
     SYAMAL RAYCHAUDHURI, PH.D. has served as Vice President of Corixa since
February 1997 and has served as Director of Vaccine Research since 1996. From
1993 to 1994, he was Director of Immunology for Actigen, Inc., a biotechnology
company, which was merged into Corixa in May 1996. From 1987 to 1993, he was a
Senior Scientist in the Department of Cellular Immunology of IDEC
Pharmaceuticals Corporation, a biopharmaceutical company. Dr. Raychaudhuri
graduated from the University of Calcutta with a B.S. in Chemistry in 1972 and
received his Ph.D. in Biochemistry from the University of Calcutta in 1980.
 
     JOSEPH S. LACOB has served as Chairman of the Board of Corixa since 1994.
Mr. Lacob has been a general partner of Kleiner Perkins Caufield & Byers, a
venture capital firm, since 1992, and was a venture partner from 1987 to 1992.
Mr. Lacob serves as Chairman of the Board of three public companies, Cardima,
Inc., Cellpro and Microcide Pharmaceuticals, Inc., and a director of two
additional public companies, Heartport, Inc. and Pharmacyclics, Inc. Mr. Lacob
graduated from the University of California, Irvine in 1978 with a B.S. in
Biological Sciences and received his M.P.H. from the University of California,
Los Angeles in 1979. Mr. Lacob also received his M.B.A. from the Stanford
Graduate School of Business in 1983.
 
     ARNOLD L. ORONSKY, PH.D. has served as a director of Corixa since 1994. He
is currently Chairman of the Board of Directors of Coulter Pharmaceuticals Inc.
("Coulter"), a biopharmaceutical company. From 1995 to 1996, Dr. Oronsky served
as President and Chief Executive Officer of Coulter. From 1994 to the present,
Dr. Oronsky has been a general partner at InterWest Partners, a venture capital
firm. From 1984 to 1994, Dr. Oronsky served as Vice President for Discovery
Research at Lederle Laboratories, a pharmaceutical division of American
Cyanamid, Inc., where he was responsible for the research of new drugs. Since
1988, Dr. Oronsky has served as a senior lecturer in the Department of Medicine
at Johns Hopkins Medical School. Dr. Oronsky graduated from University College,
New York University with a B.A. in History in 1962 and received his Ph.D. in
Biochemistry from Columbia University in 1968.
 
     ANDREW E. SENYEI, M.D. has served as a director of Corixa since 1994. Dr.
Senyei has been a general partner of Enterprise Partners, a venture capital
firm, since 1988. Dr. Senyei was a founder of Molecular Biosystems, Inc. and,
prior to joining Enterprise Partners, was a practicing clinician and Adjunct
Associate Professor of Obstetrics, Gynecology and Pediatrics at the University
of California, Irvine. Dr. Senyei graduated from Occidental College with a B.A.
in Biology in 1972 and received his M.D. from Northwestern University in 1979.
 
     The Board of Directors currently consists of five members. All directors
hold office until the next annual meeting of stockholders of the Company and
until their successors have been duly elected and qualified. The officers of the
Company are appointed annually and serve at the discretion of the Board of
Directors. There are no family relationships between any of the directors or
executive officers of the Company.
 
     The Board of Directors designated a Compensation Committee (the
"Compensation Committee") in October 1994 to review and approve the compensation
and benefits for the Company's executive officers, administer the Company's
stock option plans and make recommendations to the Board of Directors regarding
such matters. The Compensation Committee is currently comprised of Mr. Lacob and
Dr. Senyei.
 
     The Board of Directors designated an Audit Committee in December 1994 to
review the scope and results of financial audits and other services performed by
the Company's independent accountants and to make recommendations to the Board
of Directors regarding such matters. The Audit Committee is currently comprised
of Dr. Oronsky and Dr. Senyei.
 
                                       53
<PAGE>   55
 
     Directors currently receive no cash fees for services provided in that
capacity. The Company has adopted the 1997 Directors' Stock Option Plan under
which current and future nonemployee directors will be eligible to receive stock
options in consideration for their services. See "-- Stock Option and Incentive
Plans."
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
     Except as set forth below and in "Certain Transactions," no interlocking
relationship exists between the Company's Board of Directors or Compensation
Committee and the board of directors or compensation committee of any other
company, nor has any such interlocking relationship existed in the past.
 
     Dr. Gillis is Acting Chief Executive Officer and a director of GenQuest and
Mr. McDade is Acting Vice President and a director of GenQuest. Dr. Reed and Mr.
McDade are directors of IDRI. While there is no specified amount of time that
Dr. Gillis and Mr. McDade are required to devote to their respective duties as
officers of GenQuest, the Company estimates that at the present time Dr. Gillis
and Mr. McDade each devote less then 20% of their respective time to such
duties. Neither Dr. Gillis nor Mr. McDade receive compensation from GenQuest in
connection with services they perform for GenQuest. See "Certain Transactions."
 
LIMITATION OF LIABILITY AND INDEMNIFICATION MATTERS
 
     The Company's Restated Certificate of Incorporation limits the liability of
directors to the maximum extent permitted by Delaware law. Delaware law provides
that a director of a corporation will not be personally liable for monetary
damages for breach of such individual's fiduciary duties as a director, except
for liability (i) for any breach of such director's duty of loyalty to the
corporation or its stockholders, (ii) for acts or omissions not in good faith or
that involve intentional misconduct or a knowing violation of law, (iii) for
unlawful payments of dividends or unlawful stock repurchases or redemptions as
provided in Section 174 of the Delaware General Corporation Law (the "DGCL"), or
(iv) for any transaction from which a director derives an improper personal
benefit. Delaware law does not eliminate a director's duty of care and this
provision has no effect on the availability of equitable remedies such as an
injunction or recission based upon a director's breach of the duty of care. In
addition, the Company has obtained an insurance policy providing coverage for
certain liabilities of its officers and directors.
 
     The Company's Bylaws provide that the Company shall indemnify its directors
and may indemnify its officers, employees and other agents to the fullest extent
permitted by law. The Company believes that indemnification under its Bylaws
covers at least negligence and gross negligence on the part of an indemnified
party and permits the Company to advance expenses incurred by an indemnified
party in connection with the defense of any action or proceeding arising out of
such party's status or service as a director, officer, employee or other agent
of the Company upon an undertaking by such party to repay such advances if it is
ultimately determined that such party is not entitled to indemnification.
 
     The Company has entered into separate indemnification agreements with each
of its directors and officers. These agreements require the Company, among other
things, to indemnify such director or officer against certain expenses
(including attorney's fees), judgments, fines and settlement amounts
(collectively, "Liabilities") paid by such individual in connection with any
action, suit or proceeding arising out of such individual's status or service as
a director or officer of the Company (subject to certain exceptions, including
Liabilities arising from willful misconduct or conduct that is knowingly
fraudulent or deliberately dishonest or a violation of Section 16(b) of the
Securities Exchange Act of 1934, as amended (the "Exchange Act")) and to advance
expenses incurred by such individual in connection with any proceeding against
such individual with respect to which such individual may be entitled to
indemnification by the Company. The Company believes that its Restated
Certificate of Incorporation, Bylaw provisions and indemnification agreements
are necessary to attract and retain qualified persons as directors and officers.
 
     The Company is not aware of any pending litigation or proceeding involving
any director, officer, employee or agent of the Company where indemnification
will be required or permitted. The Company is not aware of any threatened
litigation or proceeding that might result in a claim for such indemnification.
 
                                       54
<PAGE>   56
 
EXECUTIVE COMPENSATION
 
     The following table sets forth certain compensation paid by the Company
during the fiscal year ended December 31, 1996 to the Company's Chief Executive
Officer and the Company's other executive officers whose total cash compensation
exceeded $100,000 (collectively, the "Named Executive Officers").
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                               1996 ANNUAL COMPENSATION
                                                               ------------------------
                     NAME AND PRINCIPAL POSITION               SALARY($)    BONUS($)(1)
        ------------------------------------------------------ ---------    -----------
        <S>                                                    <C>          <C>
        Steven Gillis, President.............................. $ 250,000    $    20,000
        Mark McDade, Executive Vice President.................   200,000         14,000
        Steven Reed, Executive Vice President.................   147,000          7,000
        Kenneth Grabstein, Vice President.....................   126,000          8,400
</TABLE>
 
- ---------------
 
(1) Bonus represents the amount actually paid to the employee in 1996, but
    earned in the preceding year.
 
     None of the Named Executive Officers were granted stock options or stock
appreciation rights during the fiscal year ended December 31, 1996. For option
holdings of the Named Executive Officers see "Principal Stockholders."
 
OPTION EXERCISES AND HOLDINGS
 
     There were no option exercises by the Named Executive Officers during
fiscal 1996. The following table sets forth for each of the Named Executive
Officers certain information concerning the number of shares subject to both
exercisable and unexercisable stock options at December 31, 1996. Also reported
are values for "in-the-money" options that represent the positive spread between
the respective exercise prices of outstanding stock options and the fair market
value of the Company's Common Stock as of December 31, 1996, as determined by
the Board of Directors.
 
                         FISCAL YEAR-END OPTION VALUES
 
   
<TABLE>
<CAPTION>
                                         NUMBER OF SHARES
                                            UNDERLYING
                                            UNEXERCISED              VALUE OF UNEXERCISED
                                         OPTIONS AT FISCAL           IN-THE-MONEY OPTIONS
                                          YEAR END(#)(1)           AT FISCAL YEAR END($)(2)
                                       ---------------------       ------------------------
                     NAME              VESTED       UNVESTED        VESTED        UNVESTED
        ------------------------------ ------       --------       ---------      ---------
        <S>                            <C>          <C>            <C>            <C>
        Steven Gillis................. 17,297        34,217        $ 219,153      $ 433,529
        Mark McDade................... 56,817        64,395          719,871        815,885
        Steven Reed...................  1,894         5,681           23,997         71,978
        Kenneth Grabstein.............     --            --               --             --
</TABLE>
    
 
- ---------------
 
(1) Options granted under the 1994 Plan may be exercised immediately upon grant
    and prior to full vesting, subject to the optionee's entering into a
    restricted stock purchase agreement with the Company with respect to any
    unvested shares. Under such agreement, the optionee grants the Company an
    option to repurchase any unvested shares at their original purchase price in
    the event the optionee's employment or consulting relationship with the
    Company is terminated. The Company's right of repurchase lapses as the
    shares vest in a series of equal quarterly or annual installments in
    accordance with the vesting schedule of the exercised options.
 
(2) Calculated based on an assumed initial public offering price of $13.00 per
share less the exercise price.
 
STOCK OPTION AND INCENTIVE PLANS
 
     Amended and Restated 1994 Stock Option Plan
 
   
     The 1994 Plan was originally adopted by the Board of Directors in October
1994 and approved by the stockholders in October 1995, amended and restated in
August 1996, which amendment and restatement was approved by the stockholders in
July 1997, and amended and restated again in July 1997, which amendment and
restatement was approved by the stockholders in September 1997. The 1994 Plan
provides for the grant to
    
 
                                       55
<PAGE>   57
 
employees of the Company (including officers and employee directors) of
incentive stock options ("ISOs") within the meaning of Section 422 of the
Internal Revenue Code of 1986, as amended (the "Code") and for the grant of
nonstatutory stock options ("NSOs") and to employees, directors and consultants
of the Company. The 1994 Plan is administered by the Board of Directors or the
Compensation Committee (the "Administrator"). The maximum number of shares which
may be subject to options granted to any one employee under the 1994 Plan for
any fiscal year is 500,000.
 
     The Administrator has the authority to grant ISOs to employees of the
Company and to grant NSOs to employees, directors and consultants of the
Company. The Administrator determines which individuals will be granted options
under the 1994 Plan and the terms of such options, including the exercise price,
the number of shares subject to such options, the maximum term for which such
options are to remain outstanding, the date upon which such options are to
become exercisable and the vesting schedule, if any, applicable to such options,
provided that the Administrator, in its discretion, may determine that an
optionee shall have the right to exercise some or all of his or her options,
including options which would not otherwise be exercisable. The exercise price
of all ISOs granted under the 1994 Plan must be at least equal to the fair
market value of the Common Stock of the Company on the date of grant. The
exercise price of all NSOs granted under the 1994 Plan must equal at least 85%
of the fair market value of the Common Stock on the date of grant. The exercise
price of any stock option granted to an optionee who owns stock representing
more than 10% of the voting power of the Company's outstanding capital stock (a
"10% Stockholder") must equal at least 110% of the fair market value of the
Common Stock on the date of grant. Payment of the exercise price may be made in
cash, by check, in the Administrator's discretion, by promissory note (for
optionees other than non-employee directors), in shares of properly registered
Common Stock (valued at the fair market value as of the exercise date of the
option) that meet certain holding requirements or, to the extent the option is
exercised for vested shares, through a special sale and remittance procedure
conducted by a Company-designated brokerage firm whereby the Company is paid
sufficient funds to cover the aggregate exercise price of the purchased shares
as well as all taxes that the Company would be required to withhold as a result
of such exercise.
 
     The term of a stock option granted under the 1994 Plan may not exceed 10
years; provided, however, that the term of an ISO granted to a 10% Stockholder
may not exceed five years. No option may be transferred by the optionee other
than by will or the laws of descent and distribution, except that an NSO may be
assigned in accordance with the terms of a domestic relations judgment, decree
or order (substantially complying with the requirements of Section 414(p) of the
Code) conveying marital property rights to any spouse or former spouse of the
optionee pursuant to applicable state domestic relations laws, and provided that
the Administrator may, in its discretion, grant transferable NSOs pursuant to
stock option grants specifying (i) the manner in which such NSOs are
transferable and (ii) that any such transfer shall be subject to applicable
laws. Except as set forth in the foregoing sentence, each option may be
exercised during the lifetime of the optionee only by such optionee. To the
extent an optionee would have the right in any calendar year to exercise for the
first time one or more ISOs for shares having an aggregate fair market value
(under all plans of the Company and determined for each share as of the date the
option to purchase the share was granted) in excess of $100,000, any such excess
options shall be treated as NSOs. In the event of a proposed dissolution or
liquidation of the Company, the 1994 Plan requires that each outstanding option
terminate and cease to be outstanding, except to the extent assumed by the
successor corporation (or parent thereof) in connection with the change in
control. In the event of a proposed sale of all or substantially all of the
assets of the Company or the merger of the Company with or into another
corporation, (i) if the options are assumed or an equivalent option is
substituted, one half of the unvested portions of option grants shall be deemed
to have vested immediately prior to such sale or merger, (ii) if the options are
not assumed or an equivalent option is not substituted, all of the unvested
portions of option grants shall be deemed to have vested immediately prior to
such sale or merger, and (iii) if an executive officer of the Company is
terminated without cause within six months following the consummation of such
sale or merger, all of the entire unvested portion of option grants to such
executive officer shall be deemed to have vested and become fully exercisable
immediately prior to such termination. Upon the termination of an optionee's
employment or other relationship with the Company, such optionee will have a
limited time within which to exercise any outstanding options, which time period
will vary depending on the reason for termination. The Administrator has the
discretion to grant options that are exercisable for unvested shares of Common
Stock and, to the extent that an optionee holds options for such
 
                                       56
<PAGE>   58
 
unvested shares of Common Stock upon termination, the Company will have the
right to repurchase any or all of the unvested shares at the per-share exercise
price paid by the optionee for the unvested shares.
 
     As of September 15, 1997, options to purchase a total of 159,117 shares of
Common Stock had been exercised, options to purchase a total of 1,145,825 shares
at a weighted average exercise price of $0.72 per share were outstanding and an
aggregate of 706,039 shares remained available for future option grants under
the 1994 Plan. Pursuant to the July 1997 amendment to the 1994 Plan, the number
of authorized shares is subject to automatic increase, on the first trading day
of each of the ten calendar years beginning in 1998 and ending in 2007, in an
amount equal to three percent of the number of shares of Common Stock
outstanding on December 31 of the immediately preceding calendar year, up to a
maximum of 500,000 shares each year over the ten-year period.
 
     The Board of Directors has the authority to amend the 1994 Plan as long as
such action does not adversely affect the rights and obligations with respect to
options or unvested stock issuances then outstanding under the 1994 Plan, and
provided further that stockholder approval is required to increase the number of
shares subject to the 1994 Plan (other than for permissible adjustments in the
event of certain changes in the Company's capitalization and as described
above), to materially modify the eligibility requirements for 1994 Plan
participation, or to materially increase the benefits accruing to participants
under the 1994 Plan. If not terminated earlier, the 1994 Plan will terminate in
2007.
 
     1997 Employee Stock Purchase Plan
 
   
     The Purchase Plan was adopted by the Board of Directors in July 1997 and
approved by the stockholders in September 1997. A total of 125,000 shares of
Common Stock has been reserved for issuance under the Purchase Plan. The
Purchase Plan, which is intended to qualify under Section 423 of the Code, will
be implemented by a series of offering periods of twelve months duration, with
new offering periods (other than the first offering period) commencing on or
about February 1 and August 1 of each year. Each offering period will consist of
two consecutive purchase periods of six months duration, with the last day of
such period being designated a purchase date. The initial offering period will
begin on the date of the Offering and will continue through July 31, 1998, with
the first purchase date occurring on January 31, 1998 and subsequent purchase
dates to occur every six months thereafter. The Purchase Plan permits eligible
employees to purchase Common Stock through payroll deductions, which may not
exceed 15% of an employee's compensation, at a price equal to the lower of 85%
of the fair market value of the Common Stock at the beginning of the offering
period and on the purchase date. If the fair market value of the Common Stock on
a purchase date is less than the fair market value at the beginning of the
offering period, a new twelve month offering period will automatically begin on
the first business day following the purchase date with a new fair market value.
The maximum number of shares an employee may purchase during each offering
period will be determined on the offering date by dividing $25,000 by the fair
market value of a share of the Company's Common Stock on the offering date
(subject to certain limitations imposed by the Code). Employees may end their
participation in an offering at any time during the offering period prior to the
purchase date, and participation ends automatically on termination of employment
with the Company. The Purchase Plan provides that in the event of a merger of
the Company with or into another corporation or a sale of substantially all of
the Company's assets, each right to purchase stock under the Purchase Plan will
be assumed or an equivalent right substituted by the successor corporation
unless the Board of Directors shortens the offering period so that employees'
rights to purchase stock under the Purchase Plan are exercised prior to the
merger or sale of assets. The number of authorized shares is subject to
automatic increase, on the first trading day of each of the 20 calendar years
beginning in 1998 and ending in 2017. If the number of shares reserved for
issuance at such time is less than one percent of the outstanding Common Stock,
then the number of shares reserved for issuance shall be increased until it
equals one percent of the outstanding Common Stock (up to a maximum of 125,000
in any calendar year), or such lower amount as determined by the Board of
Directors. The Board of Directors has the power to amend or terminate the
Purchase Plan as long as such action does not adversely affect any outstanding
rights to purchase stock thereunder. If not terminated earlier, the Purchase
Plan will terminate in 2017.
    
 
                                       57
<PAGE>   59
 
     1997 Directors' Stock Option Plan
 
   
     The Directors' Plan was adopted by the Board of Directors in July 1997 and
approved by the stockholders in September 1997. A total of 200,000 shares of
Common Stock has been reserved for issuance under the Directors' Plan. The
number of authorized shares is subject to automatic increase, on the first
trading day of each of the five calendar years beginning in 1998 and ending in
2002, in an amount equal to 50,000 shares of Common Stock or such lesser amount
as the Board of Directors may establish. The Directors' Plan provides for the
grant of NSOs to non-employee directors of the Company. The Directors' Plan is
designed to work automatically without administration; however, to the extent
administration is necessary, it will be performed by the Board of Directors. The
Directors' Plan provides that each person who is a non-employee director on the
date of the Offering and each person who first becomes a non-employee director
of the Company after the date of the Offering shall be granted NSOs to purchase
15,000 shares of Common Stock (the "First Option"). Thereafter, on the date of
each Annual Meeting of the Company's stockholders, commencing in 1998, each
non-employee director shall be automatically granted an additional option to
purchase 5,000 shares of Common Stock (a "Subsequent Option") if, on such date,
he or she shall have served on the Company's Board of Directors for at least six
months. The Directors' Plan provides that the First Option shall become
exercisable in installments as to 1/36th of the total number of shares subject
to the First Option each month after the date of grant of the First Option, and
each Subsequent Option shall become exercisable in installments as to
one-twelfth of the total number of shares subject to the Subsequent Option each
month after of the date of grant of that Subsequent Option. The exercise price
of all options granted under the Directors' Plan shall be equal to the fair
market value of the Company's Common Stock on the date of grant of the option.
Options granted under the Directors' Plan have a term of ten years. In the event
of the dissolution or liquidation of the Company, a sale of all or substantially
all of the assets of the Company, the merger of the Company with or into another
corporation in which the Company is not the surviving corporation or any other
capital reorganization in which more than 50% of the shares of the Company
entitled to vote are exchanged, each non-employee director shall have either (i)
a reasonable time within which to exercise the option, including any part of the
option that would not otherwise be exercisable, prior to the effectiveness of
such liquidation, dissolution, sale, merger, consolidation or reorganization, at
the end of which time the option shall terminate or (ii) the right to exercise
the option, including any part of the option that would not otherwise be
exercisable, or receive a substitute option with comparable terms as to an
equivalent number of shares of stock of the corporation succeeding the Company
or acquiring its business by reason of such liquidation, dissolution, sale,
merger, consolidation or reorganization. The Board of Directors may amend or
terminate the Directors' Plan; provided, however, that no such action may
adversely affect any outstanding options, and the provisions regarding the grant
of options under the Directors' Plan may be amended only once in any six-month
period, other than to comport with changes in the Employee Retirement Income
Security Act of 1974, as amended, or the Code. If not terminated earlier, the
Directors' Plan will have a term of ten years from the date of the Offering.
    
 
     401(k) Plan
 
     The Company has a tax-qualified employee savings and retirement plan (the
"401(k) Plan") covering all of the Company's employees. Pursuant to the 401(k)
Plan, employees may elect to reduce their current compensation by up to the
statutorily prescribed annual limit ($9,500 in 1997) and to have the amount of
such reduction contributed to the 401(k) Plan. The 401(k) Plan does not permit
matching contributions by the Company. The 401(k) Plan is intended to qualify
under Section 401 of the Code so that contributions by employees or by the
Company to the 401(k) Plan, and income earned on 401(k) Plan contributions, are
not taxable to employees until withdrawn from the 401(k) Plan, and so that
contributions by the Company, if any, will be deductible by the Company when
made. At the direction of each participant, the Company invests the assets of
the 401(k) Plan in any of five investment options.
 
EMPLOYMENT AGREEMENTS
 
     The Company has entered into employment agreements with each of Dr. Gillis,
Mr. McDade, Dr. Reed and Dr. Grabstein, effective as of September 30, 1994. All
of the agreements provide for employment
 
                                       58
<PAGE>   60
 
"at-will," do not provide for a specific term and can be terminated by either
the employee or the Company at any time, for any reason, with or without cause.
In addition, such agreements contain a non-competition provision. In the event
that any of the officers' employment agreements are terminated other than for
good cause (defined as gross misconduct or acts or omission that involve fraud,
embezzlement or misappropriation of property), such officer will be entitled to
receive his base salary and benefits for one year and to the continued vesting,
for such one-year period, of shares subject to those certain Stock Purchase
Agreements entered into between such officer and the Company. In connection with
their employment agreements, each of the above named officers has entered into a
proprietary information and inventions agreement with the Company.
 
     The Company has also entered into arrangements with Dr. Raychaudhuri and
Ms. Burris effective as of October 25, 1994 and March 2, 1995, respectively,
which provide for employment "at-will," do not provide for a specific term and
can be terminated by either the employee or the Company at any time, for any
reason, with or without cause. In connection with their employment agreements,
Dr. Raychaudhuri and Ms. Burris have entered into proprietary information and
inventions agreements with the Company.
 
                                       59
<PAGE>   61
 
                              CERTAIN TRANSACTIONS
 
SALES OF EQUITY SECURITIES
 
     Between September 23, 1994 and March 31, 1995, the Company issued an
aggregate of 4,646,131 shares of Series A Preferred Stock at a price per share
of $3.30. On May 10, 1996, the Company issued 505,050 shares of Series B
Preferred Stock at a price per share of $9.90. All of the Series A and Series B
Preferred Stock issued by the Company will convert into Common Stock on a
one-for-one basis upon the closing of the Offering.
 
     Listed below are those directors, executive officers and five percent
stockholders who have made equity investments in the Company or who have been
issued warrants to purchase shares of the Company's Preferred Stock or Common
Stock during the last three fiscal years.
 
<TABLE>
<CAPTION>
                                                                 NUMBER OF SHARES OUTSTANDING
                                                                         PRE-OFFERING
                                            -----------------------------------------------------------------------
                                                        SERIES A    SERIES B     COMMON
                                              COMMON    PREFERRED   PREFERRED    STOCK     SERIES B     AGGREGATE
               INVESTOR(1)                    STOCK       STOCK       STOCK     WARRANTS   WARRANTS   CONSIDERATION
- ------------------------------------------  ----------  ---------   ---------   --------   --------   -------------
<S>                                         <C>         <C>         <C>         <C>        <C>        <C>
Entities affiliated with Kleiner Perkins
  Caufield & Byers(2).....................   1,114,293  1,350,550         --         --         --     $ 4,476,824
Entities affiliated with Enterprise
  Partners................................          --  1,287,878         --    192,423         --       4,250,635
Entities affiliated with InterWest
  Investors...............................          --  1,212,120         --    183,332         --       4,000,605
Entities affiliated with Forward
  Ventures(2).............................     278,572    303,030         --         --     64,098       1,005,000
Entities affiliated with Olympic Venture
  Partners................................          --    374,378         --     37,436         --       1,235,578
S.R. One, Limited.........................          --         --    505,050         --         --       5,000,001
Steven Gillis.............................     272,727         --         --         --         --           4,500
Mark McDade...............................      90,909         --         --         --         --           1,500
Steven Reed...............................     216,361         --         --         --         --           3,570
Kenneth Grabstein.........................     189,393         --         --         --         --           3,125
Joseph S. Lacob(2)........................   1,076,415  1,350,550         --         --         --       4,476,824
Andrew E. Senyei..........................          --  1,287,878         --    192,423         --       4,250,635
Syamal Raychaudhuri.......................     113,636         --         --         --         --           1,875
Arnold L. Oronsky.........................          --  1,212,120         --    183,332         --       4,000,605
</TABLE>
 
- ---------------
 
(1) Shares held by affiliated persons and entities have been aggregated. See
"Principal Stockholders."
 
(2) Entities affiliated with Kleiner Perkins Caufield & Byers, a five percent
    stockholder, contributed a total of 97,826 shares of Common Stock as a
    capital contribution to the Company. Mr. Lacob, a director of the Company,
    is a general partner of Kleiner Perkins Caufield & Byers. Entities
    affiliated with Forward Ventures, a five percent stockholder, also
    contributed 24,456 shares of Common Stock as a capital contribution to the
    Company.
 
     On May 10, 1996, the Company sold 505,050 shares of Series B Preferred
stock to S.R. One, Limited, a wholly owned subsidiary of SmithKline Beecham and
a five percent stockholder ("S.R. One"), for an aggregate purchase price of
$5,000,001. See "Management's Discussion and Analysis of Financial Condition and
Results of Operations -- Liquidity and Capital Resources" and
"Business -- Corporate Partnerships."
 
     Holders of Preferred Stock and certain holders of Common Stock and Warrants
are entitled to certain registration rights with respect to the Common Stock
issued or issuable upon conversion thereof. See "Description of Capital
Stock -- Registration Rights."
 
GENQUEST, INC.
 
     In connection with the amended license agreement with GenQuest entered into
in December 1996, the Company entered into a management services agreement under
which the Company will provide financial, legal, administrative, management and
related services to GenQuest. GenQuest will pay the Company a nominal management
fee and will reimburse the Company for its fully-burdened cost in providing such
services. Corixa's Chief Executive Officer, Chief Scientific Officer and Chief
Operating Officer are required to
 
                                       60
<PAGE>   62
 
provide specific services to GenQuest under the management services agreement,
and other members of the Company's management team are required to provide
general support. The management services agreement terminates upon the earlier
of (i) 90 days following the expiration of the Company's right to purchase
substantially all of the outstanding shares of GenQuest's capital stock, as
described below, (ii) 90 days following the date the Company purchases
GenQuest's capital stock pursuant to such right, or (iii) at the option of
either Corixa or GenQuest, upon the termination of the amended license
agreement.
 
     In February 1996, the Company acquired an aggregate of 4,412,613 shares of
Series A Preferred Stock of GenQuest, representing approximately 16% of
GenQuest's outstanding capital stock as of June 30, 1997. GenQuest has granted
Corixa certain demand and piggyback registration rights pertaining to GenQuest
common stock issuable upon conversion of the Series A Preferred Stock and a
right to participate in future issuances of stock to maintain the Company's
pro-rata ownership interest in GenQuest. Pursuant to a voting agreement entered
into in connection with the Company's purchase of Series A Preferred Stock, the
Company is entitled to designate two of the seven nominees to the board of
directors of GenQuest.
 
   
     The Company and GenQuest have also entered into the Call Option Agreement
under which the Company has the right to purchase a significant majority of the
outstanding shares of GenQuest's capital stock in exchange for shares of the
Company's Common Stock at a purchase price determined in accordance with the
formula specified in the Call Option Agreement. The right becomes effective on
the earlier of (i) June 23, 1998, (ii) the completion of a 30-day trading period
following the Company's initial public offering during which the average closing
sale price of a share of the Company's Common Stock is at least $19.80, or (iii)
a merger of Corixa with another entity or a sale of substantially all of
Corixa's assets. Corixa's right to purchase the shares of GenQuest capital stock
terminates on the earlier of (i) January 23, 2000, (ii) the date that the
Company notifies GenQuest that it will not exercise its right, (iii) the closing
of the initial public offering of GenQuest, (iv) ten days following the
termination of the amended license agreement, or (v) ten days following a merger
of, a sale of assets by, or a change in control of Corixa. The number of shares
of Common Stock that Corixa is required to issue in order to exercise the right
is variable as the formula specified in the Call Option Agreement takes into
account the then-current fair market value of the Common Stock and the
capitalization of GenQuest as well as the date of exercise. Under this formula,
the value allocated to a share of Common Stock for the purpose of determining
the number of shares issuable upon exercise of this right is equal to the
greater of (i) the sum of $3.00 plus the quotient obtained by dividing the
difference between (a) the average closing sale price of a share of Common Stock
during the 30 trading days immediately prior to such exercise and (b) $3.00 by
2, and (ii) the product of the average closing sale price of a share of Common
Stock during the 30 trading days immediately prior to such exercise multiplied
by 0.7. The value allocated to the shares of the capital stock of GenQuest for
the purpose of determining the purchase price of such capital stock increases
ratably on a monthly basis, up to a maximum allocated price per share, based on
the length of time the right remains outstanding. The purchase price initially
allocated to the GenQuest Series B preferred stock is $1.00 per share and
increases by approximately $0.04 per month until the right is exercised, up to a
maximum of $2.00 per share. The purchase price allocated to the GenQuest Series
A preferred stock and common stock is equal to 66 2/3% of the purchase price of
the GenQuest Series B preferred stock. For example, if the Company were to
exercise such right on June 23, 1998, assuming the then-current fair market
value of the Common Stock is $13.00 per share and assuming no changes to
GenQuest's capitalization in the interim, the Company would be obligated to
issue an aggregate of approximately 4,063,460 shares of Common Stock in exchange
for such outstanding shares of GenQuest's capital stock, which amount would
represent beneficial ownership of approximately 27% of the Common Stock of the
Company (based upon 10,994,331 shares of Common Stock to be outstanding upon
completion of the Offering). Because the actual number of shares of Common Stock
that the Company is obligated to issue upon exercise of the right is dependent
upon the variables described above, the number of shares of Common Stock that
Corixa would be obligated to issue and the resulting dilution to existing
stockholders of Corixa may be substantially greater or less than that set forth
in the example above. As of the date of this Prospectus, Corixa has not made a
decision as to whether it will exercise this right. In connection with the
relationship between Corixa and GenQuest, Corixa issued warrants to purchase up
to 454,533 shares in the aggregate of Corixa's Series B Preferred Stock at an
exercise price of $9.90 per share. The holders of such warrants or their
transferees (subject to certain conditions) are entitled to
    
 
                                       61
<PAGE>   63
 
certain rights with respect to the registration of the shares of Common Stock
issuable upon exercise of such warrants. See "Business -- Relationship with
GenQuest, Inc." and "Description of Capital Stock."
 
INFECTIOUS DISEASE RESEARCH INSTITUTE
 
     In September 1994, the Company entered into a research services and
intellectual property agreement with IDRI, a not-for-profit, grant-funded
private research institute. Under this agreement, as amended and restated
effective January 1997, the Company has agreed to provide IDRI with research
funding and certain administrative and facilities support, including use of the
Company's research laboratory space. IDRI pays a services fee for the
administrative and facilities support provided by the Company. IDRI is
independent of the Company and the Company does not have the right to control or
direct IDRI's activities. Dr. Reed, the Company's Chief Scientific Officer, is
co-founder and a member of the board of directors of IDRI. Mr. McDade, the
Company's Chief Operating Officer, is also a member of the board of directors of
IDRI and Ms. Burris, the Company's Vice President of Finance and Administration,
is treasurer of IDRI. The agreement terminates on December 31, 1999, subject to
renewal for additional three-year terms at the option of the Company. If IDRI
terminates the agreement as a result of the Company's failure to make required
payments, the Company will be obligated to pay royalties on sales of
commercialized products, if any. See "Business -- Certain License Agreements."
 
CELLPRO, INCORPORATED
 
     On November 1, 1995, the Company entered into a research collaboration and
license agreement with CellPro whereby CellPro will make payments to Corixa to
support research activities and the parties will grant licenses to the other.
The agreement was amended effective January 1997. Mr. Lacob, Chairman of the
Board of Directors of the Company, is also the Chairman of the Board of
Directors of CellPro. See "Business -- Corporate Partnerships."
 
INDEMNIFICATION AGREEMENTS
 
     The Company has entered into an indemnification agreement with each of its
officers and directors.
 
     The Company believes that all of the transactions set forth above were made
on terms no less favorable to the Company than could have been obtained from
unaffiliated third parties. All future transactions, including loans, between
the Company and its officers, directors, principal stockholders and their
affiliates will be approved by a majority of the Board of Directors, including a
majority of the independent and disinterested directors, and will continue to be
on terms no less favorable to the Company than could be obtained from
unaffiliated third parties and will be made only for bona fide business
purposes.
 
                                       62
<PAGE>   64
 
                             PRINCIPAL STOCKHOLDERS
 
     The following table sets forth certain information with respect to
beneficial ownership of the Company's Common Stock as of June 30, 1997, and as
adjusted to reflect the sale of shares of Common Stock offered hereby, as to (i)
each person (or group of affiliated persons) known by the Company to own
beneficially more than five percent of the Company's outstanding Common Stock,
(ii) each of the Company's directors, (iii) each of the Named Executive
Officers, and (iv) all current directors and executive officers of the Company
as a group.
 
<TABLE>
<CAPTION>
                                                                                        PERCENT OF
                                                                                    SHARES BENEFICIALLY
                                                                                        OWNED(1)(2)
                                                                NUMBER OF        -------------------------
                                                           SHARES BENEFICIALLY     BEFORE         AFTER
          NAME AND ADDRESS OF BENEFICIAL OWNER                  OWNED(1)          OFFERING      OFFERING
- ---------------------------------------------------------  -------------------   -----------   -----------
<S>                                                        <C>                   <C>           <C>
Entities affiliated with
  Kleiner Perkins Caufield & Byers(3)....................       2,464,843            29.9%         22.4%
  2750 Sand Hill Road
  Menlo Park, CA 94025
Entities affiliated with
  Enterprise Partners(4).................................       1,480,301            18.0          13.5
  5000 Birch Street, Suite 6200
  Newport Beach, CA 92660
Entities affiliated with
  InterWest Investors(5).................................       1,395,452            16.9          12.7
  3000 Sand Hill Road
  Building 3, Suite 255
  Menlo Park, CA 94025
Entities affiliated with
  Forward Ventures (6)...................................         645,700             7.7           5.8
  9255 Towne Center Drive, Suite 300
  San Diego, CA 92121
S.R. One, Limited........................................         505,050             6.1           4.6
  Bay Colony Executive Park
  565 East Swedesford, Suite 315
  Wayne, PA 19087
Entities affiliated with
  Olympic Venture Partners(7)............................         411,814             5.0           3.7
  2420 Carillon Point
  Kirkland, WA 98033
Steven Gillis, Ph.D.(8)..................................         341,412             4.1           3.1
Mark McDade(9)...........................................         229,292             2.7           2.1
Kenneth Grabstein, Ph.D.(10).............................         206,564             2.5           1.9
Steven Reed, Ph.D.(11)...................................         197,169             2.4           1.8
Joseph S. Lacob(12)......................................       2,426,965            29.4          22.1
Andrew E. Senyei, M.D.(4)................................       1,480,301            18.0          13.5
Arnold L. Oronsky(5).....................................       1,395,452            16.9          12.7
All directors and executive officers as a group (9              6,492,556            75.5          57.2
  persons)(13)...........................................
</TABLE>
 
- ---------------
 
 (1) Includes the number of shares and percentage ownership represented by such
     shares determined to be beneficially owned by a person in accordance with
     the rules of the Securities and Exchange Commission plus all additional
     options and warrants to purchase Common Stock exercisable at any time after
     60 days from June 30, 1997. Such shares, however, are not deemed
     outstanding for the purposes of computing the percentage ownership of any
     other person. Such exercisable options are shown in the footnotes to this
     table for each such person. To the Company's knowledge, the persons named
     in this table have sole voting and investment power with respect to all
     shares of Common Stock shown as owned by them, subject to community
     property laws where applicable and except as indicated in the other
     footnotes to this table.
 
 (2) Based on 8,244,331 shares outstanding prior to the Offering and 10,994,331
     shares outstanding after the Offering, and assuming no exercise of the
     Underwriters' over-allotment option.
 
                                       63
<PAGE>   65
 
 (3) Includes 2,364,292 shares held by Kleiner Perkins Caufield & Byers VII,
     62,673 shares held by Kleiner Perkins Caufield & Byers VI and 37,878 shares
     held by Cynthia Healy, Director Life Science Research at Kleiner Perkins
     Caufield & Byers. Joseph S. Lacob, the Chairman of Board of Directors, is a
     general partner of Kleiner Perkins Caufield & Byers VII and Kleiner Perkins
     Caufield & Byers VI, and, as such, may be deemed to share voting and
     investment power with respect to such shares except for the shares held by
     Dr. Healy. Mr. Lacob disclaims beneficial ownership of such shares, except
     to the extent of his pecuniary interest in such shares.
 
 (4) Includes 1,184,848 shares held by Enterprise Partners III, L.P., 103,030
     shares held by Enterprise Partners III Associates, L.P. and 187,538 shares
     issuable upon the net exercise of outstanding warrants held by entities
     affiliated with Enterprise Partners exercisable within 60 days of June 30,
     1997. Andrew E. Senyei, a Director, is a general partner of Enterprise
     Partners III, L.P. and Enterprise Partners III Associates, and, as such,
     may be deemed to share voting and investment power with respect to such
     shares.
 
   
 (5) Includes 1,204,545 shares held by InterWest Partners V, L.P., 7,575 shares
     held by InterWest Investors V, L.P. and 178,677 shares issuable upon the
     net exercise of outstanding warrants held by entities affiliated with
     InterWest Investors within 60 days of June 30, 1997. Arnold L. Oronsky, a
     Director, is a general partner of InterWest Partners V, L.P. and, as such,
     may be deemed to share voting and investment power with respect to such
     shares. Dr. Oronsky disclaims beneficial ownership of shares held by
     InterWest Partners V, L.P., except to the extent of his pecuniary interest
     in such shares, and disclaims beneficial ownership to all shares held by
     InterWest Investors V, L.P.
    
 
 (6) Includes 505,846 shares held by Forward Ventures II, L.P., 37,878 shares
     held by the Royston Family Trust UTA DTD 2/12/82, whose co-trustee is Ivor
     Royston, a general partner of Forward Ventures, 37,878 shares held by
     Standish Fleming, a general partner of Forward Ventures and 64,098 shares
     issuable upon the exercise of outstanding warrants held by individuals and
     entities affiliated with Forward Ventures exercisable within 60 days of
     June 30, 1997.
 
 (7) Includes 355,660 shares held by Olympic Venture Partners III, 18,718 shares
     held by OVP III Entrepreneurs Fund and 36,484 shares issuable upon the net
     exercise of outstanding warrants held by entities affiliated with Olympic
     Venture Partners exercisable within 60 days of June 30, 1997.
 
 (8) Includes 68,685 shares issuable upon the exercise of outstanding options
     held by Dr. Gillis exercisable within 60 days of June 30, 1997, at which
     date 28,387 shares were fully vested.
 
 (9) Includes 138,383 shares issuable upon the exercise of outstanding options
     held by Mr. McDade exercisable within 60 days of June 30, 1997, at which
     date 81,417 shares were fully vested.
 
(10) Includes 17,171 shares issuable upon the exercise of outstanding options
     held by Dr. Grabstein exercisable within 60 days of June 30, 1997, at which
     date 2,504 shares were fully vested.
 
(11) Includes 24,746 shares issuable upon the exercise of outstanding options
     held by Dr. Reed exercisable within 60 days of June 30, 1997, at which
     date, 5,660 shares were fully vested, and 15,151 shares held in the name of
     Steven James N. Reed, UGMA WA Merrill Lynch and 15,151 shares held in the
     name of Sarah Mariko Reed, UGMA WA Merrill Lynch, both of which accounts
     Dr. Reed is custodian.
 
(12) Includes 2,364,292 shares held by Kleiner Perkins Caufield & Byers VII and
     62,673 shares held by Kleiner Perkins Caufield & Byers VI. Mr. Lacob,
     Chairman of the Board of Directors, is a general partner of Kleiner Perkins
     Caufield & Byers VII and Kleiner Perkins Caufield & Byers VI, and, as such,
     may be deemed to share voting and investment power with respect to such
     shares. Mr. Lacob disclaims beneficial ownership of such shares, except to
     the extent of his pecuniary interest in such shares.
 
(13) Includes shares referred to in footnotes (4)-(5) and (8)-(12). Also
     includes 61,867 shares issuable upon the exercise of outstanding options
     held by Michelle Burris, an executive officer of the Company, exercisable
     within 60 days of June 30, 1997, at which date 13,707 shares were fully
     vested, and 153,534 shares beneficially owned by Syamal Raychaudhuri, an
     officer of the Company, which includes 39,898 shares issuable upon the
     exercise of outstanding options held by Dr. Raychaudhuri exercisable within
     60 days of June 30, 1997, at which date 15,508 shares were fully vested.
 
                                       64
<PAGE>   66
 
                          DESCRIPTION OF CAPITAL STOCK
 
     Upon completion of the Offering, and after giving effect to the amendment
of the Company's Restated Certificate of Incorporation to delete references to
the Series A Preferred Stock and Series B Preferred Stock and to increase the
authorized number of shares of Common Stock, the authorized capital stock of the
Company will consist of 40,000,000 shares of Common Stock, $0.001 par value, and
10,000,000 shares of Preferred Stock, $0.001 par value.
 
     The following summary of certain characteristics of the Common Stock and
Preferred Stock does not purport to be complete and is subject to, and qualified
in its entirety by, the provisions of the Company's Restated Certificate of
Incorporation which is included as an exhibit to the Registration Statement of
which this Prospectus is a part, and by the provisions of applicable law.
 
COMMON STOCK
 
     As of June 30, 1997, there were 8,244,331 shares of Common Stock
outstanding that were held of record by approximately 84 stockholders after
giving effect to the conversion of the Company's Series A and Series B Preferred
Stock into Common Stock at a one-to-one ratio and assuming the net exercise of
outstanding warrants for 445,139 shares of Common Stock. There will be
10,994,331 shares of Common Stock outstanding (assuming no exercise of the
Underwriters' over-allotment option or exercise of outstanding options under the
1994 Plan after June 30, 1997) after giving effect to the sale of the shares of
Common Stock offered hereby. See "Management -- Stock Option and Incentive
Plans."
 
     The holders of Common Stock are entitled to one vote per share on all
matters to be voted upon by the stockholders. Subject to preferences that may be
applicable to any outstanding Preferred Stock, the holders of Common Stock are
entitled to receive such dividends, if any, as may be declared from time to time
by the Board of Directors out of funds legally available therefor. See "Dividend
Policy." In the event of a liquidation, dissolution or winding up of the
Company, the holders of Common Stock are entitled to share ratably in all assets
remaining after payment of liabilities, subject to prior rights of Preferred
Stock, if any, then outstanding. Holders of Common Stock have no preemptive or
conversion rights or other subscription rights. There are no redemption or
sinking fund provisions available to the holders of Common Stock. All
outstanding shares of Common Stock are fully paid and non-assessable, and the
shares of Common Stock to be issued upon completion of the Offering will be
fully paid and non-assessable.
 
PREFERRED STOCK
 
     Pursuant to the Company's Restated Certificate of Incorporation, the Board
of Directors has the authority, without further action by the stockholders, to
issue up to 10,000,000 shares of Preferred Stock in one or more series. The
Board of Directors will have the authority to issue the undesignated Preferred
Stock and to determine the powers, preferences and rights and the
qualifications, limitations or restrictions granted to or imposed upon any
wholly unissued series of undesignated Preferred Stock, and to fix the number of
shares constituting any series and the designation of such series, without any
further vote or action by the stockholders. The issuance of Preferred Stock may
have the effect of delaying, deferring or preventing a change in control of the
Company without further action by the stockholders and may adversely affect the
voting and other rights of the holders of Common Stock. At the close of the
Offering, there will be no shares of Preferred Stock outstanding and the Company
currently has no plans to issue any shares of Preferred Stock.
 
WARRANTS
 
     As of the date of this Prospectus, the Company has warrants outstanding
exercisable to purchase an aggregate of 527,533 shares of Common Stock, 195,454
shares of Series A Preferred Stock and 454,533 shares of Series B Preferred
Stock, each as described below.
 
     In connection with the issuance of certain shares of Series A Preferred
Stock, the Company issued to the purchasers of such shares warrants to purchase
up to an aggregate of 413,191 shares of the Company's
 
                                       65
<PAGE>   67
 
Common Stock at an exercise price of $0.33 per share. The warrants expire in
December 2004 and January 2005.
 
     In connection with a license agreement entered into in May 1996, the
Company issued the Southern Research Institute a warrant to purchase up to an
aggregate of 75,757 shares of Common Stock at an exercise price of $0.003 per
share. The warrant expires on May 22, 2006.
 
     In connection with a facilities lease entered into in May 1996, the Company
issued to Health Science Properties, Inc. ("HSP"), John Teutsch and Robert
Mooney warrants to purchase up to an aggregate of 38,585 shares of Common Stock
at an exercise price of $6.60 per share. Messrs. Teutsch's and Mooney's warrants
expire on July 24, 2006 and HSP's warrants expire on May 10, 2008. HSP has
subsequently distributed such warrants to its shareholders.
 
     In connection with a capital equipment lease entered into in December 1994,
the Company issued to Comdisco, Inc. a warrant to purchase up to an aggregate of
31,818 shares of the Company's Series A Preferred Stock. Upon the closing of the
Offering, such warrant will become a warrant exercisable to purchase the same
number of shares of Common Stock at an exercise price of $3.30 per share. The
warrant expires on the later of December 9, 2004 and five years after the
Company's initial public offering.
 
     In connection with a license agreement entered into in January 1996, the
Company issued the Mayo Foundation for Medical Education and Research a warrant
to purchase up to an aggregate of 12,121 shares of the Company's Series A
Preferred Stock, subject to certain milestones. Upon the closing of the
Offering, the warrant will become a warrant exercisable to purchase the same
number of shares of Common Stock at an exercise price of $6.60 per share. The
warrant expires on January 1, 2006.
 
     In connection with a license agreement entered into in April 1996, the
Company issued Vaxcel, Inc. a warrant to purchase up to an aggregate of 151,515
shares of the Company's Series A Preferred Stock, subject to certain milestones.
Upon the closing of the Offering, the warrant will become a warrant exercisable
to purchase the same number of shares of Common Stock at an exercise price of
$6.60 per share. The warrant expires upon the earlier to occur of (i) the
termination of the license agreement entered into in connection with the
issuance of the warrant and (ii) ten years from the date of execution of such
warrant.
 
     In connection with the relationship between Corixa and GenQuest, the
Company issued warrants to purchase up to an aggregate of 454,533 shares of the
Company's Series B Preferred Stock an exercise price of $9.90 per share. The
warrants expire on the earlier of (i) December 23, 2001 or (ii) the closing of
the sale of the assets or capital stock of the Company.
 
REGISTRATION RIGHTS OF CERTAIN HOLDERS
 
     The holders of 7,925,862 shares of Common Stock and certain holders of
warrants exercisable for up to 694,512 additional shares of Common Stock (the
"Registrable Securities") or their transferees (subject to certain conditions)
are entitled to certain rights with respect to the registration of such shares
under the Securities Act. Of such holders, holders of 35,555 Registrable
Securities have certain rights to registration of such Registrable Securities in
the Offering. All such rights have been waived or have expired by reason of
lapse of time.
 
     The registration rights are provided for under the terms of an amended and
restated investors' rights agreement (the "Rights Agreement") between the
Company and the holders of Registrable Securities. Certain holders of at least
40% of the Registrable Securities then outstanding may require, on two occasions
at any time after one year following the effective date of the Offering, that
the Company use its best efforts to register the Registrable Securities for
public resale; provided, among other limitations, that the proposed aggregate
selling price, prior to deductions for underwriting discounts and commissions,
is at least $5,000,000. The Company may delay such registration by up to 120
days for business reasons (but not more than once in any one-year period). If
the Company registers any of its Common Stock either for its own account or for
the account of other security holders, the holders of Registrable Securities are
entitled to include their shares of Common Stock in the registration. Generally
speaking, a holder's right to include shares in either a demand or piggyback
underwritten registration is subject to the ability of the underwriters to limit
the number of shares
 
                                       66
<PAGE>   68
 
included in the offering. Certain holders of at least 20% of the Registrable
Securities then outstanding may also require the Company, on no more than one
occasion over any one-year period, to register all or a portion of their
Registrable Securities on Form S-3 when use of such form becomes available to
the Company, provided, among other limitations, that the proposed aggregate
selling price, prior to deductions for underwriting discounts and commissions,
is at least $500,000. The Company may delay such registration by up to 120 days
for business reasons. Subject to certain limitations contained in the Rights
Agreement, all fees, costs and expenses of registrations effected pursuant to
the Rights Agreement, excluding those incurred with respect to registrations on
Form S-3, must be borne by the Company, and all selling expenses (including
underwriting discounts and selling commissions) relating to Registrable
Securities must be borne by the holders of the securities being registered.
Subject to certain limitations contained in the Rights Agreement, all fees,
costs, and expenses (excluding selling expenses) for the first two registrations
on Form S-3 each year shall be borne by the Company and, thereafter, by the
holders of the securities being registered (including selling expenses).
 
ANTI-TAKEOVER EFFECTS OF DELAWARE AND WASHINGTON LAW
 
     The Company is subject to the provisions of Section 203 of the DGCL. In
general, the statute prohibits a publicly held Delaware corporation from
engaging in a "business combination" with an "interested stockholder" for a
period of three years after the date that the person became an interested
stockholder, unless: (i) prior to such date, the board of directors of the
corporation approved either the business combination or the transaction that
resulted in the stockholder becoming an interested stockholder; (ii) upon
consummation of the transaction that resulted in the stockholder becoming an
interested stockholder, the interested stockholder owned at least 85% of the
voting stock of the corporation outstanding at the time the transaction
commenced, excluding for purposes of determining the number of shares
outstanding those shares owned (a) by persons who are directors and also
officers and (b) by employee stock plans in which employee participants do not
have the right to determine whether shares held subject to the plan will be
tendered in a tender or exchange offer; or (iii) on or subsequent to such date,
the business combination is approved by the board of directors and authorized at
an annual or special meeting of stockholders (not by written consent), by the
affirmative vote of at least 66 2/3% of the outstanding voting stock that is not
owned by the interested stockholder.
 
     Section 203 defines a business combination to include: (i) any merger or
consolidation involving the corporation and the interested stockholder; (ii) any
sale, transfer, pledge or other disposition of 10% or more of the assets of the
corporation involving the interested stockholder; (iii) subject to certain
exceptions, any transaction that results in the issuance or transfer by the
corporation of any stock of the corporation to the interested stockholder; (iv)
any transaction involving the corporation that has the effect of increasing the
proportionate share of the stock of any class or series of the corporation
beneficially owned by the interested stockholder; or (v) the receipt by the
interested stockholder of the benefit of any loans, advances, guarantees,
pledges or other financial benefits provided by or through the corporation. In
general, Section 203 defines an interested stockholder as any entity or person
beneficially owning 15% or more of the outstanding voting stock of the
corporation and any entity or person affiliated with or controlling or
controlled by such entity or person.
 
     Additionally, the laws of the State of Washington, where the Company's
principal executive offices are located, impose restrictions on certain
transactions between certain foreign corporations and significant stockholders.
Chapter 23B.19 of the Washington Business Corporation Act (the "WBCA") prohibits
a "target corporation," with certain exceptions, from engaging in certain
"significant business transactions" with a person or group of persons who
beneficially own 10% or more of the voting securities of the target corporation
(an "acquiring person") for a period of five years after such acquisition,
unless the transaction or acquisition of such shares is approved by a majority
of the members of the target corporation's board of directors prior to the time
of acquisition. Such prohibited transactions include, among other things, a
merger or consolidation with, disposition of assets to, or issuance or
redemption of stock to or from, the acquiring person, termination of 5% or more
of the employees of the target corporation as a result of the acquiring person's
acquisition of 10% or more of the shares or allowing the acquiring person to
receive disproportionate benefit as a stockholder. After the five-year period, a
significant business transaction may take place as long as
 
                                       67
<PAGE>   69
 
it complies with certain fair price provisions of the statute. A target
corporation includes a foreign corporation if (i) the corporation has a class of
voting stock registered pursuant to Section 12 or 15 of the Exchange Act, (ii)
the corporation's principal executive office is located in Washington, (iii) any
of (a) more than 10% of the corporation's stockholders of record are Washington
residents, (b) more than 10% of its shares are owned of record by Washington
residents, or (c) 1,000 or more of its stockholders of record are Washington
residents, (d) a majority of the corporation's employees are Washington
residents or more than 1,000 Washington residents are employees of the
corporation, and (e) a majority of the corporation's tangible assets are located
in Washington or the corporation has more than $50.0 million of tangible assets
located in Washington. A corporation may not "opt out" of this statute and,
therefore, the Company anticipates this statute will apply to it. Depending upon
whether the Company meets the definition of a target corporation, Chapter 23B.19
of the WBCA may have the effect of delaying, deferring or preventing a change in
control of the Company.
 
     In addition, upon completion of the Offering, certain provisions of the
Company's charter documents, including a provision eliminating the ability of
stockholders to take actions by written consent, may have the effect of delaying
or preventing changes in control or management of the Company, which could have
an adverse effect on the market price of the Company's Common Stock. In the
event of a proposed sale of all or substantially all of the assets of the
Company, or the merger of the Company with or into another corporation, the
Company's stock option and purchase plans generally provide for the acceleration
of one-half of the unvested portion of options in the event the successor
corporation assumes the option or grants an equivalent option and the
acceleration of all of the unvested portion of options in the event the
successor corporation does not assume the options or grant an equivalent option.
In addition, the Company's stock option and purchase plans allow an optionee, in
the discretion of the Board of Directors, to exercise some or all of the their
options, including non-vested shares, or to have the vesting of options
accelerated upon a change of control or similar event. The Board of Directors
has the authority to issue up to 10,000,000 shares of Preferred Stock and to fix
the rights, preferences, privileges and restrictions, including voting rights,
of these shares without any further vote or action by the stockholders. The
rights of the holders of the Common Stock will be subject to, and may be
adversely affected by, the rights of the holders of any Preferred Stock that may
be issued in the future. The issuance of Preferred Stock, while providing
desirable flexibility in connection with possible acquisitions and other
corporate purposes, could have the effect of making it more difficult for a
third party to acquire a majority of the outstanding voting stock of the
Company, thereby delaying, deferring or preventing a change in control of the
Company. Furthermore, such Preferred Stock may have other rights, including
economic rights senior to the Common Stock, and, as a result, the issuance of
such Preferred Stock could have a material adverse effect on the market value of
the Common Stock. The Company has no present plan to issue shares of Preferred
Stock.
 
TRANSFER AGENT AND REGISTRAR
 
     The Transfer Agent and Registrar for the Company's Common Stock is The
Harris Trust Company. Its address is Suite 4900, 601 South Figueroa Street, Los
Angeles, California 90017 and its telephone number is (213) 239-0600.
 
                                       68
<PAGE>   70
 
                        SHARES ELIGIBLE FOR FUTURE SALE
 
     Upon completion of the Offering and based on the shares outstanding as of
June 30, 1997, the Company will have a total of 10,994,331 shares of Common
Stock outstanding (11,406,831 shares if the Underwriters' over-allotment options
are exercised in full), assuming the net exercise of outstanding warrants for
445,139 shares of Common Stock immediately upon the closing of the Offering, no
exercise of warrants for 694,512 shares, and no exercise of options after June
30, 1997. Of these shares, the 2,750,000 shares offered hereby (3,162,500 shares
if the Underwriters' over-allotment options are exercised in full) will be
freely tradable without restriction or registration under the Securities Act by
persons other than "affiliates" of the Company, as defined under the Securities
Act. The remaining 8,244,331 shares of Common Stock outstanding are Restricted
Shares.
 
     The holders of 8,051,548 Restricted Shares, including all officers and
directors of the Company and certain other stockholders, are subject to
"lock-up" agreements with the Representatives of the Underwriters and/or the
Company providing that they will not offer, sell, contract to sell or grant any
option to purchase or otherwise dispose of the shares of Common Stock owned by
them or that could be purchased by them through the exercise of options to
purchase Common Stock of the Company for a period of 180 days after the
effectiveness of the Registration Statement (the "Lockup Period") without the
prior written consent of Lehman Brothers Inc. on behalf of the Underwriters
and/or the Company, as applicable. The Company has agreed with the
Representatives of the Underwriters not to release any holders from such
agreements without the prior written consent of Lehman Brothers Inc. on behalf
of the Underwriters. Such lock-up agreements may be released at any time as to
any or all of the shares subject to such agreements at the sole discretion of
Lehman Brothers Inc. Of the 8,051,548 Restricted Shares that will first become
eligible for sale in the public market 180 days after the effectiveness of the
Registration Statement, 1,522,149 shares will be immediately eligible for sale
without restriction under Rule 144(k) or Rule 701, and 6,524,854 shares will be
immediately eligible for sale subject to certain volume and other restrictions
pursuant to Rule 144. As of 180 days after the effectiveness of the Registration
Statement, 163,357 shares of Common Stock will remain subject to the Company's
right of repurchase pursuant to stock purchase agreements and therefore will not
be available for sale under Rule 144 until such right of repurchase lapses.
Beginning immediately after the closing of the Offering, 12,593 shares will be
available for sale under Rule 144 upon the exercise of outstanding warrants, and
beginning 180 days after the closing of the Offering, an additional 681,919
shares will be available for sale under Rule 144 upon the exercise of warrants.
 
     In general, under Rule 144, beginning 90 days after the date of this
Prospectus, a person (or persons whose shares are aggregated) who has
beneficially owned Restricted Shares for at least one year, including persons
who may be deemed to be "affiliates" of the Company, would be entitled to sell
within any three-month period a number of shares that does not exceed the
greater of: (i) one percent of the number of shares of Common Stock then
outstanding (which will equal approximately 109,943 shares immediately after the
Offering); or (ii) the average weekly trading volume of the Common Stock as
reported through the Nasdaq National Market during the four calendar weeks
preceding the filing of a Form 144 with respect to such sale. Sales under Rule
144 are also subject to certain manner of sale provisions and notice
requirements and to the availability of current public information about the
Company. Under Rule 144(k), a person who is not deemed to have been an affiliate
of the Company at any time during the 90 days preceding a sale, and who has
beneficially owned for at least two years the Restricted Shares proposed to be
sold (including the holding period of any prior owner except an affiliate), is
entitled to sell such shares without complying with the manner of sale, public
information, volume limitation or notice provisions of Rule 144.
 
     Subject to certain limitations on the aggregate offering price of a
transaction and certain other conditions, Rule 701 permits the resale of shares
issued prior to the date the issuer becomes subject to the reporting
requirements of the Exchange Act, pursuant to certain compensatory benefit plans
and contracts commencing 90 days after the issuer becomes subject to the
reporting requirements of the Exchange Act, in reliance upon Rule 144 but
without compliance with certain restrictions, including the holding period
requirements, contained in Rule 144. In addition, the Securities and Exchange
Commission (the "Commission") has indicated that Rule 701 will apply to typical
stock options granted by an issuer before it becomes subject to the reporting
requirements of the Exchange Act, as well as the shares acquired upon exercise
of such options
 
                                       69
<PAGE>   71
 
(including exercises after the date of this Prospectus). Securities issued in
reliance on Rule 701 are restricted securities and, subject to the contractual
restrictions described above, beginning 90 days after the date of this
Prospectus, may be sold by persons other than affiliates subject only to the
manner of sale provisions of Rule 144 and by affiliates under Rule 144 without
compliance with its two-year minimum holding period requirements.
 
     The Company has also agreed not, directly or indirectly, to offer for sale,
sell, pledge or otherwise dispose of (or enter into transaction or device which
is designed to, or could be expected to, result in the disposition by any person
at any time in the future of) any shares of Common Stock (other than Common
Stock sold in the Offering and shares issued pursuant to employee benefit plans,
qualified stock option plans or other employee compensation plans currently
existing or pursuant to currently outstanding contractual obligations, options,
warrants or rights), or sell or grant options, rights or warrants with respect
to any shares of Common Stock (other than the grant of options pursuant to
currently existing option plans or contractual obligations) for a period of 180
days after the effectiveness of the Registration Statement, without the prior
written consent of Lehman Brothers Inc.
 
     After completion of this Offering, the Company intends to register on a
Form S-8 registration statement under the Securities Act, during the 180-day
lockup period, the resale of 1,893,653 shares of Common Stock issuable upon
exercise of outstanding options or reserved for issuance under the 1994 Plan,
200,000 shares of Common Stock reserved for issuance under the Directors' Plan
and 125,000 shares reserved for issuance under the Purchase Plan. Such
registration will permit the resale of shares so registered by non-affiliates in
the public market without restriction under the Securities Act upon expiration
of the Lockup Period.
 
     In addition, beginning one year after the Offering, holders of 7,925,862
shares of Common Stock and holders of warrants to acquire 694,512 shares of
Common Stock may require the Company to register their shares of Common Stock
under the Securities Act, which would permit such holders to resell a certain
number of their shares without complying with Rule 144. Registration and sale of
such shares could have an adverse effect on the trading price of the Common
Stock. If the Company were to include in a Company-initiated registration any
Registrable Securities pursuant to the exercise of piggyback registration
rights, such sales could have an adverse effect on the Company's ability to
raise needed capital. See "Description of Capital Stock -- Registration Rights."
 
     Prior to the Offering, there has been no public market for the Common
Stock, and no predictions can be made as to the effect, if any, that the sale or
availability for shares of additional Common Stock will have on the trading
price of the Common Stock. Nevertheless, sales of a substantial number of such
shares in the public market, or the perception that such sales could occur,
could adversely affect the trading price of the Common Stock and could impair
the Company's future ability to raise capital through an offering of its equity
securities. See "Risk Factors -- Shares Eligible for Future Sale" and
"Description of Capital Stock."
 
                                       70
<PAGE>   72
 
                                  UNDERWRITING
 
     Under the terms of, and subject to the conditions contained in, the
Underwriting Agreement, the form of which is filed as an exhibit to the
Registration Statement, the Underwriters named below, for whom Lehman Brothers
Inc., Invemed Associates, Inc., Vector Securities International, Inc. are acting
as representatives (the "Representatives"), have severally agreed to purchase
from the Company, and the Company has agreed to sell to each Underwriter, the
aggregate number of shares of Common Stock set forth opposite the name of each
such Underwriter below:
 
<TABLE>
<CAPTION>
                                                                            NUMBER OF
                                   UNDERWRITER                               SHARES
        ------------------------------------------------------------------  ---------
        <S>                                                                 <C>
        Lehman Brothers Inc...............................................
        Invemed Associates, Inc...........................................
        Vector Securities International, Inc..............................
                                                                              -------
                  Total...................................................  2,750,000
                                                                              =======
</TABLE>
 
     The Company has been advised by the Representatives that the Underwriters
propose to offer the shares of Common Stock to the public at the initial public
offering price set forth on the cover page hereof, and to certain dealers at
such initial public offering price less a selling concession not in excess of
$     per share. The Underwriters may allow, and such dealers may reallow, a
concession not in excess of $     per share to certain other Underwriters or to
certain other brokers or dealers. After the initial offering to the public, the
offering price and other selling terms may be changed by the Representatives.
 
     The Underwriting Agreement provides that the obligations of the
Underwriters to pay for and accept delivery of the shares of Common Stock
offered hereby are subject to approval of certain legal matters by counsel and
to certain other conditions, including the condition that no stop order
suspending the effectiveness of the Registration Statement is in effect and no
proceedings for such purpose are pending or threatened by the Commission and
that there has been no material adverse change or any development involving a
prospective material adverse change in the condition of the Company from that
set forth in the Registration Statement otherwise than as set forth or
contemplated in this Prospectus, and that certain certificates, opinions and
letters have been received from the Company and its counsel and independent
auditors. The Underwriters are obligated to take and pay for all of the above
shares of Common Stock if any such shares are taken.
 
     The Company has agreed to indemnify the Underwriters against certain
liabilities, including liabilities under the Securities Act, and to contribute
to payments that the Underwriters may be required to make in respect thereof.
 
     The Company has granted to the Underwriters an option to purchase up to an
additional 412,500 shares of Common Stock, exercisable solely to cover
over-allotments, at the initial public offering price less the underwriting
discounts and commissions shown on the cover page hereof. Such option may be
exercised at any time until 30 days after the date of the Underwriting
Agreement. To the extent that the option is exercised, each Underwriter will be
committed, subject to certain conditions, to purchase a number of the additional
shares of Common Stock proportionate to such Underwriter's initial commitment as
indicated in the preceding table.
 
     The Representatives have informed the Company that they do not intend to
confirm sales of Common Stock offered hereby to any accounts over which they
exercise discretionary authority.
 
     Prior to the Offering, there has been no public market for the Common
Stock. The initial public offering price will be negotiated by and among the
Company and the Representatives. The primary factors considered in determining
the initial public offering price of the Common Stock, in addition to prevailing
market conditions, will be the Company's historical performance and capital
structure, estimates of business potential and earnings prospects of the
Company, an assessment of the Company, an assessment of the Company's management
and the consideration of the above factors in relation to market valuation of
companies in related businesses.
 
                                       71
<PAGE>   73
 
     Until the distribution of the Common Stock is completed, rules of the
Commission may limit the ability of the Underwriters and certain selling group
members to bid for and purchase shares of Common Stock. As an exception to these
rules, the Representatives are permitted to engage in certain transactions that
stabilize the price of the Common Stock. Such transactions may consist of bids
or purchases for the purpose of pegging, fixing or maintaining the price of the
Common Stock. In addition, if the Representatives over-allot (i.e., if they sell
more shares of Common Stock than are set forth on the cover page of this
Prospectus), and thereby create a short position in the Common Stock in
connection with the Offering, the Representatives may reduce that short position
by purchasing Common Stock in the open market. The Representatives may also
elect to reduce any short position by exercising all or part of the
over-allotment option described herein.
 
     The Representatives may also impose a penalty bid on certain Underwriters
and selling group members. This means that if the Representatives purchase
shares of Common Stock in the open market to reduce the Underwriters' short
position or to stabilize the price of the Common Stock, they may reclaim the
amount of the selling concession from the Underwriters and selling group members
who sold those shares as part of the Offering. In general, purchases of a
security for the purpose of stabilization or to reduce a syndicate short
position could cause the price of the security to be higher than it might
otherwise be in the absence of such purchases. The imposition of a penalty bid
might have an effect on the price of a security to the extent that it were to
discourage resales of the security by purchasers in the Offering. Neither the
Company nor any of the Underwriters makes any representation or prediction as to
the direction or magnitude of any effect that the transactions described above
may have on the price of the Common Stock. In addition, neither the Company nor
any of the Underwriters makes any representation that the Representatives will
engage in such transactions or that such transactions, once commenced, will not
be discontinued without notice.
 
     At the request of the Company, the Underwriters have reserved up to 137,500
shares of Common Stock for sale at the initial public offering price to
officers, employees and certain other persons associated with the Company. The
number of shares available for sale to the general public will be reduced to the
extent such persons purchase such reserved shares. Any reserved shares not so
purchased will be offered by the Underwriters to the general public on the same
basis as the other shares offered hereby. Reserved shares purchased by
individuals will, except as restricted by applicable securities laws, be
available for resale following the Offering.
 
     For a period of 180 days after the effectiveness of the Registration
Statement, without the prior written consent of Lehman Brothers Inc., and/or the
Company, as applicable, the Company and holders of 8,051,548 shares of Common
Stock have agreed not to offer, sell or contract to sell, pledge, grant any
option to purchase, make any short sale, pledge or otherwise dispose of,
directly or indirectly, any shares of Common Stock or securities exchangeable or
exercisable for or convertible into shares of, or any other rights to purchase
or acquire Common Stock of the Company other than issuances pursuant to existing
employee compensation plans, existing contractual obligations of the Company,
transfers that will not result in any change in beneficial ownership, including,
but not limited to, pro rata partnership distributions and transfers into trusts
for the benefit of the original holder or members of the original holder's
immediate family, certain pledges, or transfers that constitute bona fide gifts.
 
                                 LEGAL MATTERS
 
     The validity of the Common Stock offered hereby will be passed upon for the
Company by its counsel, Venture Law Group, A Professional Corporation, 4750
Carillon Point, Kirkland, Washington 98033. Certain legal matters will be passed
upon for the Underwriters by Cooley Godward LLP, Five Palo Alto Square, 3000 El
Camino Real, Palo Alto, California 94306.
 
                                       72
<PAGE>   74
 
                                    EXPERTS
 
     The financial statements of Corixa Corporation, as of December 31, 1995 and
1996, and for each of the two years in the period ended December 31, 1996, and
for the period from September 8, 1994 (date of inception) to December 31, 1996,
appearing in this Prospectus and Registration Statement have been audited by
Ernst & Young LLP, independent auditors as set forth in their report thereon
appearing elsewhere herein and are included in reliance upon such reports given
upon the authority of such firm as experts in accounting and auditing.
 
     The financial statements of Corixa Corporation for the period from
September 8, 1994 (date of inception) to December 31, 1994 have been included
herein and in the registration statement in reliance upon the report of KPMG
Peat Marwick LLP, independent certified public accountants, appearing elsewhere
herein, and upon the authority of said firm as experts in accounting and
auditing.
 
                             ADDITIONAL INFORMATION
 
     The Company has filed with the Commission a Registration Statement on Form
S-1, of which this Prospectus constitutes a part, under the Securities Act with
respect to the shares of Common Stock offered hereby. This Prospectus omits
certain information contained in the Registration Statement, and reference is
made to the Registration Statement and the exhibits and schedules filed
therewith for further information with respect to the Company and the Common
Stock offered hereby. Statements contained herein concerning the provisions of
any documents are not necessarily complete, and in each instance reference is
made to the copy of such document filed as an exhibit to the Registration
Statement. Each such statement is qualified in its entirety by such reference.
The Registration Statement, including exhibits and schedules filed therewith,
may be inspected without charge at the principal office of the Commission at
Room 1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549 or at
the regional offices of the Commission located at Room 1400, 75 Park Place, New
York, New York 10007, and Northwest Atrium Center, 500 West Madison Street,
Suite 1400, Chicago, Illinois 60661. Copies of such materials may be obtained
from the Public Reference Section of the Commission, Room 1024, Judiciary Plaza,
450 Fifth Street, N.W., Washington, D.C. 20549, and its public reference
facilities in New York, New York and Chicago, Illinois, at prescribed rates. The
Commission also maintains a site on the World Wide Web at http://www.sec.gov
where such materials may be obtained. The Company has filed the Registration
Statement, including the exhibits and schedules hereto, electronically with the
Commission via the Commissions' Electronic Data Gathering, Analysis, and
Retrieval ("EDGAR") system. The Company intends to distribute to its
stockholders annual reports containing audited financial statements examined by
an independent public accountant and will make available copies of quarterly
reports for the first three quarters of each fiscal year containing unaudited
interim financial information.
 
                                       73
<PAGE>   75
 
                          GLOSSARY OF SCIENTIFIC TERMS
 
     ADJUVANT: a substance capable of non-specifically enhancing or boosting an
immune response.
 
     ANTIBODY: a product of B cells that recognizes and attaches to antigens
thereby triggering the elimination of an invading pathogen.
 
     ANTIGEN: a component of a pathogen consisting of a protein, peptide and/or
carbohydrate that is recognized by cells of the immune system.
 
     ANTIGEN PRESENTING CELL ("APC"): a specialized immune system cell that
breaks down antigens and presents the component parts to T cells, thereby
initiating an immune response.
 
     B LYMPHOCYTES ("B CELLS"): specialized immune system cells that produce
antibodies.
 
     CYTOKINES: immune system hormones that serve to enhance or maintain
cellular and antibody-based immune responses.
 
     CYTOTOXIC T LYMPHOCYTES ("CTL"): specialized T cells that have the ability
to recognize and kill pathogen-infected tissue or tumor cells.
 
     HELPER T CELLS: specific antigen-reactive T cells that serve to enhance or
maintain immune response through the production of specific cytokines.
 
     HER-2/NEU: a gene that is markedly over-expressed on the surface of
approximately 50% of breast and ovarian carcinomas.
 
     LEISHMANIA ELONGATION INITIATING FACTOR ("LEIF"): a protein produced by the
parasite Leishmania that the Company has found to function as a potent adjuvant.
 
     MICROSPHERES: synthetic microscopic particles that the Company uses to
encapsulate antigens for use in vaccines.
 
     T LYMPHOCYTES ("T CELLS"): specialized immune system cells that generate a
cellular immune response against pathogens or tumor cells, including the
activation of antigen-reactive helper T cells and CTL.
 
     TH1 RESPONSE: a particular type of helper T cell response that enhances the
generation and activation of CTL and leads to antibody production by B cells.
 
                                       74
<PAGE>   76
 
                      (This page intentionally left blank)
<PAGE>   77
 
                               CORIXA CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
 
                              FINANCIAL STATEMENTS
 
                     YEARS ENDED DECEMBER 31, 1996 AND 1995
                     AND THE PERIOD FROM SEPTEMBER 8, 1994
                 (DATE OF INCEPTION) THROUGH DECEMBER 31, 1994
 
                         INDEX TO FINANCIAL STATEMENTS
 
   
Reports of Independent Auditors.........................................F-2, F-3
    
 
Audited Financial Statements
 
Balance Sheets...............................................................F-4
Statements of Operations.....................................................F-5
Statements of Stockholders' Equity...........................................F-6
Statements of Cash Flows.....................................................F-7
Notes to Financial Statements................................................F-8
 
                                       F-1
<PAGE>   78
 
                          INDEPENDENT AUDITORS' REPORT
 
The Board of Directors and Stockholders
Corixa Corporation
 
     We have audited the accompanying statements of operations, stockholders'
equity and cash flows of Corixa Corporation (a development stage company) for
the period from September 8, 1994 (date of inception) to December 31, 1994.
These financial statements are the responsibility of the Company's management.
Our responsibility is to express an opinion on these financial statements based
on our audit.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audit provides a reasonable basis for our opinion.
 
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the results of operations and the cash flows of Corixa
Corporation for the period from September 8, 1994 (date of inception) to
December 31, 1994, in conformity with generally accepted accounting principles.
 
                                          KPMG Peat Marwick LLP
 
Seattle, Washington
April 28, 1995
 
                                       F-2
<PAGE>   79
 
               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
The Board of Directors and Stockholders
Corixa Corporation
 
     We have audited the accompanying balance sheets of Corixa Corporation (a
development stage company) as of December 31, 1996 and 1995, and the related
statements of operations, stockholders' equity, and cash flows for each of the
two years in the period ended December 31, 1996 and for the period from
September 8, 1994 (date of inception) through December 31, 1996. These financial
statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these financial statements based on
our audit. The financial statements as of December 31, 1994, and for the period
from September 8, 1994 (date of inception) through December 31, 1994, were
audited by other auditors whose report dated April 28, 1995 expressed an
unqualified opinion on those statements. The financial statements for the period
from September 8, 1994 (date of inception) to December 31, 1994 included a
cumulative loss of $989,250. Our opinion on the statements of operations and
cash flows for the period from September 8, 1994 (date of inception) through
December 31, 1996, insofar as it relates to amounts for the period prior to
January 1, 1995, is based solely on the report of other auditors.
 
     We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audit and the report of other auditors provide a reasonable
basis for our opinion.
 
     In our opinion, based on our audit and the report of other auditors, the
financial statements referred to above present fairly, in all material respects,
the financial position of Corixa Corporation (a development stage company) at
December 31, 1996 and 1995, and the results of its operations and its cash flows
for each of the two years in the period ended December 31, 1996 and for the
period from September 8, 1994 (date of inception) through December 31, 1996 in
conformity with generally accepted accounting principles.
 
Seattle, Washington
January 31, 1997,
except Footnote 11, as to which the date is
   
September 24, 1997
    
 
                                       F-3
<PAGE>   80
 
                               CORIXA CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
 
                                 BALANCE SHEETS
 
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                                                                       PRO FORMA
                                                                                                      STOCKHOLDERS'
                                                                                                       EQUITY AT
                                                                  DECEMBER 31,                         JUNE 30,
                                                            -------------------------    JUNE 30,        1997
                                                               1995          1996          1997        (NOTE 11)
                                                            -----------   -----------   -----------   -----------
                                                                                        (UNAUDITED)   (UNAUDITED)
<S>                                                         <C>           <C>           <C>           <C>
Current assets:
  Cash and cash equivalents...............................  $ 3,003,938   $ 2,088,226   $   295,251
  Securities available-for-sale...........................    7,768,727     9,845,180    14,751,336
  Accounts receivable (including $166,640 and $269,400
     receivable from an affiliated company at December 31,
     1996 and June 30, 1997, respectively)................       52,119       687,048       415,737
  Prepaid expenses........................................      177,735       264,859       408,085
                                                            -----------   -----------   -----------
Total current assets......................................   11,002,519    12,885,313    15,870,409
Property and equipment, net...............................    1,269,068     2,237,196     3,917,132
Other assets, net.........................................       68,301        62,402       242,287
                                                            -----------   -----------   -----------
Total assets..............................................  $12,339,888   $15,184,911   $20,029,828
                                                            ===========   ===========   ===========
                                      LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable and accrued liabilities................  $   570,109   $   978,738   $   918,673
  Deferred revenue........................................      412,917     1,318,130     1,345,102
  Current portion of obligations..........................      276,936       487,758       808,162
                                                            -----------   -----------   -----------
Total current liabilities.................................    1,259,962     2,784,626     3,071,937
Long-term obligations, less current portion...............      815,888     1,175,354     5,085,823
Commitments
Stockholders' equity:
  Convertible preferred stock, $0.001 par value:
     Authorized shares -- 23,100,000 (16,100,000
       designated as Series A and 1,666,667 designated as
       Series B); (10,000,000 pro forma)
     Issued and outstanding Series A shares -- 4,646,131
       (no shares pro forma) (aggregate liquidation
       preference of $15,332,279 at December 31, 1996)....        4,646         4,646         4,646            --
     Issued and outstanding Series B shares -- 505,050 (no
       shares pro forma) (aggregate liquidation preference
       of $5,000,001 at December 31, 1996)................           --           505           505            --
  Common stock, $0.001 par value:
     Authorized shares -- 40,000,000
     Issued and outstanding shares -- 2,492,811 at
       December 31, 1995, 2,594,137 at December 31, 1996,
       and 2,648,011 at June 30, 1997 (7,799,192 shares
       pro forma).........................................        2,493         2,594         2,648         7,799
  Additional paid-in capital..............................   15,382,893    21,655,080    25,623,952    25,623,952
  Receivable for warrants.................................           --    (1,140,000)     (931,697)     (931,697)
  Deferred compensation...................................           --            --    (3,532,585)   (3,532,585)
  Deficit accumulated during development stage............   (5,125,994)   (9,297,894)   (9,295,401)   (9,295,401)
                                                            -----------   -----------   -----------   -----------
Total stockholders' equity................................   10,264,038    11,224,931    11,872,068   $11,872,068
                                                                                                      ===========
                                                            -----------   -----------   -----------
Total liabilities and stockholders' equity................  $12,339,888   $15,184,911   $20,029,828
                                                            ===========   ===========   ===========
</TABLE>
 
   
                            See accompanying notes.
    
 
                                       F-4
<PAGE>   81
 
                               CORIXA CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
 
                            STATEMENTS OF OPERATIONS
 
   
<TABLE>
<CAPTION>
                              PERIOD FROM                               PERIOD FROM
                               SEPTEMBER                                 SEPTEMBER
                                  8,                                        8,
                                 1994                                      1994                                    PERIOD FROM
                               (DATE OF                                  (DATE OF                                 SEPTEMBER 8,
                              INCEPTION)                                INCEPTION)                                    1994
                                  TO               YEAR ENDED               TO            SIX MONTHS ENDED          (DATE OF
                               DECEMBER           DECEMBER 31,           DECEMBER             JUNE 30,            INCEPTION) TO
                                  31,       -------------------------       31,       -------------------------     JUNE 30,
                                 1994          1995          1996          1996          1996          1997           1997
                              -----------   -----------   -----------   -----------   -----------   -----------   -------------
                                                                                      (UNAUDITED)   (UNAUDITED)    (UNAUDITED)
<S>                           <C>           <C>           <C>           <C>           <C>           <C>           <C>
Revenues:
  Collaborative
    agreements..............  $        --   $ 2,410,834   $ 4,401,560   $ 6,812,394   $ 1,730,740   $ 6,939,588    $13,751,982
  Government grants.........           --       304,029     1,402,979     1,707,008       626,743       553,571      2,260,579
                              -----------   -----------   -----------   -----------   -----------   -----------    -----------
    Total revenues..........           --     2,714,863     5,804,539     8,519,402     2,357,483     7,493,159     16,012,561
Operating expenses:
  Research and
    development.............     (438,783)   (7,039,757)   (9,994,796)  (17,473,336)   (4,708,234)   (7,104,054)   (24,577,390)
  In-process research and
    development.............     (428,059)           --            --      (428,059)           --            --       (428,059)
  General and
    administrative..........     (205,533)     (531,880)     (780,904)   (1,518,317)     (438,359)     (779,047)    (2,297,364)
                              -----------   -----------   -----------   -----------   -----------   -----------    -----------
    Total operating
      expenses..............   (1,072,375)   (7,571,637)  (10,775,700)  (19,419,712)   (5,146,593)   (7,883,101)   (27,302,813)
                              -----------   -----------   -----------   -----------   -----------   -----------    -----------
Income (loss) from
  operations................   (1,072,375)   (4,856,774)   (4,971,161)  (10,900,310)   (2,789,110)     (389,942)   (11,290,252)
Interest income.............       83,125       772,426       642,011     1,497,562       279,910       390,652      1,888,214
Interest expense............           --       (82,024)     (165,613)     (247,637)      (67,120)     (155,571)      (403,208)
Other income................           --        16,399       348,000       364,399       174,000       187,274        551,673
                              -----------   -----------   -----------   -----------   -----------   -----------    -----------
Net income (loss)...........  $  (989,250)  $(4,149,973)  $(4,146,763)  $(9,285,986)  $(2,402,320)  $    32,413    $(9,253,573)
                              ===========   ===========   ===========   ===========   ===========   ===========    ===========
Pro forma net income (loss)
  per share (unaudited).....                              $     (0.50)                              $      0.00
                                                          ===========                               ===========
Shares used in computation
  of pro forma net income
  (loss) per share..........                                8,342,583                                 8,536,343
                                                          ===========                               ===========
</TABLE>
    
 
                            See accompanying notes.
 
                                       F-5
<PAGE>   82
 
                               CORIXA CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
 
                       STATEMENTS OF STOCKHOLDERS' EQUITY
 
<TABLE>
<CAPTION>
                                                                                                          DEFICIT
                      CONVERTIBLE                                                                       ACCUMULATED
                    PREFERRED STOCK        COMMON STOCK      ADDITIONAL    RECEIVABLE                     DURING
                   ------------------   ------------------     PAID-IN         FOR         DEFERRED     DEVELOPMENT
                    SHARES     AMOUNT    SHARES     AMOUNT     CAPITAL      WARRANTS     COMPENSATION      STAGE         TOTAL
                   ---------   ------   ---------   ------   -----------   -----------   ------------   -----------   -----------
<S>                <C>         <C>      <C>         <C>      <C>           <C>           <C>            <C>           <C>
  Issuance of
    common stock
    to original
    employees and
    founders for
    cash, at
    $0.017 per
    share........         --   $   --   2,338,048   $2,338   $    38,257   $        --   $        --    $        --   $    40,595
  Issuance of
    common stock,
    valued at
    $0.017 per
    share, in
    business
   combination...         --       --     115,863      116         1,796            --            --             --         1,912
  Issuance of
    Series A
    convertible
    preferred
    stock for
    cash, at
    $3.30 per
    share........  4,480,427    4,480          --       --    14,780,975            --            --             --    14,785,455
  Issuance of
    Series A
    convertible
    preferred
    stock, valued
    at $3.30 per
    share, in
    business
   combination...     62,674       63          --       --       206,761            --            --             --       206,824
  Issuance of
    warrants, for
    cash, to
    purchase
    common
    stock........         --       --          --       --         1,354            --            --             --         1,354
  Net unrealized
    loss on
    securities
    available-for-sale...        --     --        --     --           --            --            --         (9,208)       (9,208)
  Net loss for
    the period
    from
    inception
    through
    December 31,
    1994.........         --       --          --       --            --            --            --       (989,250)     (989,250)
                   ---------   ------   ---------   ------   -----------   -----------   -----------    -----------   -----------
Balance at
  December 31,
  1994...........  4,543,101    4,543   2,453,911    2,454    15,029,143            --            --       (998,458)   14,037,682
  Issuance of
    Series A
    convertible
    preferred
    stock at
    $3.30 per
    share, for
    cash.........    103,030      103          --       --       339,897            --            --             --       340,000
  Issuance of
    common stock,
    valued at
    $0.33 per
    share, for
    services.....         --       --      42,233       42        13,895            --            --             --        13,937
  Repurchase of
    common stock
    at $0.017 per
    share........         --       --      (3,333)      (3)          (52)           --            --             --           (55)
  Issuance of
    warrants, for
    cash, to
    purchase
    common
    stock........         --       --          --       --            10            --            --             --            10
  Net unrealized
    gain on
    securities
    available-for-sale...        --     --        --     --           --            --            --         22,437        22,437
  Net loss for
    the year
    ended
    December 31,
    1995.........         --       --          --       --            --            --            --     (4,149,973)   (4,149,973)
                   ---------   ------   ---------   ------   -----------   -----------   -----------    -----------   -----------
Balance at
  December 31,
  1995...........  4,646,131    4,646   2,492,811    2,493    15,382,893            --            --     (5,125,994)   10,264,038
  Issuance of
    common stock,
    valued at
    $0.33 per
    share, for
    services.....         --       --      33,328       33        12,967            --            --             --        13,000
  Stock options
    exercised....                          67,998       68        22,372            --            --             --        22,440
  Issuance of
    Series B
    convertible
    preferred
    stock for
    cash, at
    $9.90 per
    share........    505,050      505          --       --     4,999,496            --            --             --     5,000,001
  Issuance of
    Series A
    convertible
    preferred
    stock and
    common stock
    warrants for
    acquired
    technology...         --       --          --       --        97,352            --            --             --        97,352
  Net unrealized
    loss on
    securities
    available-for-sale...        --     --        --     --           --            --            --        (25,137)      (25,137)
  Warrants issued
    in exchange
    for
    receivable...                                              1,140,000    (1,140,000)           --             --            --
  Net loss for
    the year
    ended
    December 31,
    1996.........         --       --          --       --                          --            --     (4,146,763)   (4,146,763)
                   ---------   ------   ---------   ------   -----------   -----------   -----------    -----------   -----------
Balance at
  December 31,
  1996...........  5,151,181    5,151   2,594,137    2,594    21,655,080    (1,140,000)           --     (9,297,894)   11,224,931
  Warrants
    payment
    received
    (unaudited)..         --       --          --       --            --       208,303            --             --       208,303
  Stock options
    exercised
   (unaudited)...         --       --      49,329       49        27,586            --            --             --        27,635
  Issuance of
    common stock,
    valued at
    $8.25 per
    share for
    services
   (unaudited)...         --       --       4,545        5        37,491            --            --             --        37,496
  Net unrealized
    loss on
    securities
    available-for-sale
    (unaudited)...        --       --          --       --            --            --            --        (29,920)      (29,920)
  Deferred
    compensation
    related to
    stock option
    grants
   (unaudited)...         --       --          --       --     3,903,795            --    (3,903,795)            --            --
  Amortization of
    deferred
    compensation
   (unaudited)...         --       --          --       --            --            --       371,210             --       371,210
  Net income for
    the period
    ended June
    30, 1997
   (unaudited)...         --       --          --       --            --            --            --         32,413        32,413
                   ---------   ------   ---------   ------   -----------   -----------   -----------    -----------   -----------
Balance at June
  30, 1997
  (unaudited)....  5,151,181   $5,151   2,648,011   $2,648   $25,623,952   $  (931,697)  $(3,532,585)   $(9,295,401)  $11,872,068
                   =========   ======   =========   ======   ===========   ===========   ===========    ===========   ===========
</TABLE>
 
                            See accompanying notes.
 
                                       F-6
<PAGE>   83
 
                               CORIXA CORPORATION
 
                         (A DEVELOPMENT STAGE COMPANY)
 
                            STATEMENTS OF CASH FLOWS
<TABLE>
<CAPTION>
                                             PERIOD FROM                                        PERIOD FROM        SIX MONTHS
                                          SEPTEMBER 8, 1994                                  SEPTEMBER 8, 1994     ENDED JUNE
                                         (DATE OF INCEPTION)    YEAR ENDED DECEMBER 31,     (DATE OF INCEPTION)       30,
                                           TO DECEMBER 31,     --------------------------     TO DECEMBER 31,     ------------
                                                1994              1995           1996              1996               1996
                                         -------------------   -----------   ------------   -------------------   ------------
                                                                                                                  (UNAUDITED)
<S>                                      <C>                   <C>           <C>            <C>                   <C>
OPERATING ACTIVITIES
Net (loss) income.......................    $    (989,250)     $(4,149,973)  $ (4,146,763)     $  (9,285,986)     $ (2,402,320)
Adjustments to reconcile net loss to net
  cash used in operating activities:
  Depreciation and amortization.........            3,649          293,241        571,106            867,996           239,733
  In-process research and development...          428,059               --             --            428,059                --
  Equity instruments granted in exchange
    for services and technology.........               --           13,937         97,352            111,289           107,352
  Amortization of deferred
    compensation........................               --               --             --                 --                --
  Changes in certain assets and
    liabilities:
    Accounts receivable.................               --          (52,119)      (634,929)          (687,048)           53,749
    Interest receivable.................         (158,923)         108,576         50,347                 --                --
    Prepaid expenses....................          (10,908)        (165,262)       (87,124)          (263,294)         (139,248)
    Other assets........................          (54,967)          76,184          5,899             27,116           (27,063)
    Accounts payable and accrued
      expenses..........................          (68,050)         414,356        408,629            754,935           (65,909)
    Deferred revenue....................               --          412,917        905,213          1,318,130           408,333
                                             ------------      -----------    -----------       ------------      ------------
Net cash provided by (used in) operating
  activities............................         (850,390)      (3,048,143)    (2,830,270)        (6,728,803)       (1,825,373)
INVESTING ACTIVITIES
Purchases of securities available-for-
  sale..................................      (11,932,613)      (5,222,538)   (11,269,688)       (28,424,839)      (10,578,495)
Proceeds from maturities of securities
  available-for-sale....................               --        9,450,000      9,117,751         18,567,751         5,701,550
Purchases of property and equipment.....          (27,367)        (270,475)      (543,619)          (841,461)         (114,907)
Cash acquired in acquisitions...........           29,939               --             --             29,939                --
                                             ------------      -----------    -----------       ------------      ------------
Net cash provided by (used in) investing
  activities............................      (11,930,041)       3,956,987     (2,695,556)       (10,668,610)       (4,991,852)
FINANCING ACTIVITIES
Proceeds from issuance of convertible
  preferred stock.......................    $  14,785,455      $   340,000   $  5,000,001      $  20,125,456      $  5,000,001
Borrowings from collaborative
  agreement.............................               --               --             --                 --                --
Proceeds from issuance of common
  stock.................................           40,595               --         35,440             76,035               440
Proceeds from issuance of warrants......            1,354               10             --              1,364                --
Repurchase of common stock..............               --              (55)            --                (55)               --
Principal payments on capital leases....               --         (151,355)      (425,327)          (576,682)         (178,809)
Payments on notes due to stockholders...               --         (140,479)            --           (140,479)               --
                                             ------------      -----------    -----------       ------------      ------------
Net cash provided by financing
  activities............................       14,827,404           48,121      4,610,114         19,485,639         4,821,632
Net increase (decrease) in cash and cash
  equivalents...........................        2,046,973          956,965       (915,712)         2,088,226        (1,995,593)
Cash and cash equivalents at beginning
  of period.............................               --        2,046,973      3,003,938                 --         3,003,938
                                             ------------      -----------    -----------       ------------      ------------
Cash and cash equivalents at end of
  period................................    $   2,046,973      $ 3,003,938   $  2,088,226      $   2,088,226      $  1,008,345
                                             ============      ===========    ===========       ============      ============
SUPPLEMENTAL SCHEDULE OF NONCASH
  OPERATING, INVESTING, AND FINANCING
  ACTIVITIES
  Assets acquired pursuant to capital
    leases..............................    $          --      $ 1,244,179   $    995,615      $   2,239,794      $    549,162
  Warrants and stock issued in exchange
    for technology......................               --               --         97,352             97,352            97,352
  Interest paid.........................               --           82,024        165,613            247,637            67,120
 
<CAPTION>
 
                                                            PERIOD FROM
                                                         SEPTEMBER 8, 1994
                                                        (DATE OF INCEPTION)
                                             1997        TO JUNE 30, 1997
                                          -----------   -------------------
                                          (UNAUDITED)       (UNAUDITED)
<S>                                      <<C>           <C>
OPERATING ACTIVITIES
Net (loss) income.......................  $    32,413      $  (9,253,573)
Adjustments to reconcile net loss to net
  cash used in operating activities:
  Depreciation and amortization.........      457,530          1,325,526
  In-process research and development...           --            428,059
  Equity instruments granted in exchange
    for services and technology.........      245,784            357,073
  Amortization of deferred
    compensation........................      371,210            371,210
  Changes in certain assets and
    liabilities:
    Accounts receivable.................      271,311           (415,737)
    Interest receivable.................           --                 --
    Prepaid expenses....................     (143,226)          (406,520)
    Other assets........................     (471,325)          (444,209)
    Accounts payable and accrued
      expenses..........................      (60,064)           694,871
    Deferred revenue....................       26,972          1,345,102
                                          -----------       ------------
Net cash provided by (used in) operating
  activities............................      730,605         (5,998,198)
INVESTING ACTIVITIES
Purchases of securities available-for-
  sale..................................   (7,444,633)       (35,869,472)
Proceeds from maturities of securities
  available-for-sale....................    2,800,000         21,367,751
Purchases of property and equipment.....     (544,172)        (1,385,633)
Cash acquired in acquisitions...........           --             29,939
                                          -----------       ------------
Net cash provided by (used in) investing
  activities............................   (5,188,805)       (15,857,415)
FINANCING ACTIVITIES
Proceeds from issuance of convertible
  preferred stock.......................  $        --      $  20,125,456
Borrowings from collaborative
  agreement.............................    3,000,000          3,000,000
Proceeds from issuance of common
  stock.................................       27,648            103,683
Proceeds from issuance of warrants......           --              1,364
Repurchase of common stock..............           --                (55)
Principal payments on capital leases....     (362,423)          (939,105)
Payments on notes due to stockholders...           --           (140,479)
                                          -----------       ------------
Net cash provided by financing
  activities............................    2,665,225         22,150,864
Net increase (decrease) in cash and cash
  equivalents...........................   (1,792,975)           295,251
Cash and cash equivalents at beginning
  of period.............................    2,088,226                 --
                                          -----------       ------------
Cash and cash equivalents at end of
  period................................  $   295,251      $     295,251
                                          ===========       ============
SUPPLEMENTAL SCHEDULE OF NONCASH
  OPERATING, INVESTING, AND FINANCING
  ACTIVITIES
  Assets acquired pursuant to capital
    leases..............................  $ 1,593,294      $   3,833,088
  Warrants and stock issued in exchange
    for technology......................       37,496            134,848
  Interest paid.........................      155,571            403,208
</TABLE>
 
                            See accompanying notes.
 
                                       F-7
<PAGE>   84
 
                               CORIXA CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
 
                         NOTES TO FINANCIAL STATEMENTS
               INFORMATION AS OF JUNE 30, 1997 FOR THE SIX MONTHS
                   ENDED JUNE 30, 1996 AND 1997 IS UNAUDITED
 
1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Nature of Activities
 
     Corixa Corporation (the Company), a development stage company, is focused
on the discovery and early clinical development of vaccine products that induce
specific and potent pathogen- or tumor-reactive T lymphocyte (T cell) responses
for the treatment and prevention of cancers and certain infectious diseases. The
Company employs the following three proprietary core technology platforms, which
together comprise the elements the Company believes are necessary for effective
T cell vaccines: (i) microsphere delivery systems that specifically activate
appropriate T cell responses; (ii) adjuvants that specifically enhance
appropriate T cell responses; and (iii) disease-specific antigens that are
essential to elicit appropriate T cell responses. Principal activities to date
include conducting research and development, pursuing intellectual property
protection, entering into collaborative in- and out-licensing agreements,
raising capital, recruiting scientific and management personnel, and
establishing a research facility.
 
  Interim Financial Information
 
     The financial information at June 30, 1997 and for the six months ended
June 30, 1996 and 1997 is unaudited, but includes all adjustments (consisting
only of normal recurring adjustments) that the Company considers necessary for a
fair presentation of the financial position at such date and the operating
results and cash flows for those periods. Operating results for the six months
ended June 30, 1997 are not necessarily indicative of the results that may be
expected for the entire year.
 
  Cash and Cash Equivalents
 
     All short-term investments, which consist primarily of bankers' acceptances
and certificates of deposit, with maturities of three months or less at date of
purchase are considered to be cash equivalents. The amounts are recorded at
cost, which approximates fair market value.
 
  Securities Available-for-Sale
 
     The Company's investment portfolio is classified as available-for-sale, and
such securities are stated at fair value, with the unrealized gains and losses
reflected in stockholders' equity. Interest earned on securities is included in
interest income. The amortized cost of investments is adjusted for amortization
of premiums and accretion of discounts to maturity. Such amortization and
accretions are included in interest income. The cost of securities sold is
calculated using the specific identification method.
 
  Management of Credit Risk
 
     The Company is subject to concentration of credit risk, primarily from its
cash investments. Credit risk for cash investments is managed by purchase of
investment grade securities and diversification of the investment portfolio
among issuers and maturities.
 
  Property and Equipment
 
     Property and equipment is stated at cost and is depreciated on the
straight-line method over the assets' estimated useful lives, which range from
three to four years. Leasehold improvements are amortized over the lesser of
their estimated useful lives or the term of the lease. Amortization of assets
recorded under capital leases is included in depreciation.
 
                                       F-8
<PAGE>   85
 
                               CORIXA CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
  Stock-Based Compensation
 
     In October 1995, the Financial Accounting Standards Board issued Statement
of Financial Accounting Standards No. 123, "Accounting for Stock-Based
Compensation" (Statement 123). The Company has adopted the disclosure-only
provisions of Statement 123, and applies Accounting Principles Board Opinion No.
25 (APB 25) and related Interpretations in accounting for its stock option
plans. Accordingly, the Company's stock-based compensation expense is recognized
based on the intrinsic value of the option on the date of grant. Pro forma
disclosure of net loss and earnings per share under Statement 123 is provided in
Note 5 to the financial statements.
 
     The Company records deferred compensation for the difference between the
exercise price and the deemed fair value for financial reporting purposes of
stock options granted. The compensation expense related to such grants is
amortized over the vesting period.
 
  Use of Estimates
 
     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the financial statements and
accompanying notes. Actual results could differ from those estimates.
 
  Other Financial Instruments
 
     At December 31, 1996 and June 30, 1997, the carrying value of financial
instruments such as receivables and payables approximated their fair values,
based on the short-term maturities of these instruments. Additionally, the
carrying value of long-term liabilities approximated fair values because the
underlying interest rates reflect market rates at the balance sheet dates.
 
  Investment in GenQuest
 
     The Company's preferred stock investment in GenQuest, which constitutes
less than 20% of the voting stock of GenQuest, is accounted for using the cost
method. The carrying value of this investment is zero. See Note 9.
 
  Revenues
 
     Revenue under collaborative agreements typically consists of nonrefundable
up-front fees, ongoing research and development payments, and milestone and
royalty payments. Revenue from nonrefundable up-front fees is recognized upon
satisfaction of related obligations. Revenue from ongoing research and co-
development payments is recognized ratably over the term of the agreement, as
the Company believes such payments will approximate the research and development
expense being incurred associated with the agreement. Revenue from milestone,
royalty, and other contingent payments will be recognized as earned. Advance
payments received under any agreements in excess of amounts earned are recorded
as deferred revenue. Revenue under cost reimbursement contracts is recognized as
the related costs are incurred.
 
  Research and Development Expenses
 
     Research and development costs are expensed as incurred.
 
  Income Taxes
 
     The Company accounts for income taxes using the liability method under
Statement of Accounting Standards No. 109, "Accounting for Income Taxes."
 
                                       F-9
<PAGE>   86
 
                               CORIXA CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
  Historical and Pro Forma Net Income (Loss) Per Share
 
     Historical net income (loss) per share is based on the weighted average
number of common and common equivalent shares outstanding during each period.
Common equivalent shares from preferred stock, stock options, and warrants are
not included in the per share calculation when the effect of their inclusion
would be antidilutive, except that, in accordance with Securities and Exchange
Commission requirements, for pro forma purposes, common and common equivalent
shares issued during the 12-month period immediately preceding the Company's
initial public offering have been included in the calculation as if they were
outstanding for all periods prior to the initial public offering using the
treasury stock method, even though their inclusion would be antidilutive. In
addition, for pro forma purposes, all outstanding shares of convertible
preferred stock are assumed to have been converted to common stock at the time
of issuance. Historical net loss per share for the periods ended December 31,
1996, 1995 and 1994 were $1.23, $1.24 and $0.30, respectively.
 
  Reclassifications
 
     Certain reclassifications have been made to the prior years' financial
statements to conform to the 1996 presentation.
 
2. ACQUISITIONS
 
     The Company acquired two companies in 1994. The acquisitions were accounted
for using the purchase method of accounting, whereby the purchase prices were
allocated to the assets acquired and liabilities assumed based on their relative
fair values. The excess of the cost over the fair value of net assets acquired
was accounted for as in-process research and development, which was expensed.
 
     Iasys Corporation: In September 1994, the Company acquired all of the
outstanding common stock of Iasys Corporation (Iasys). The purchase price
consisted of 115,863 shares of the Company's common stock valued at an aggregate
of $1,912 and the assumption of certain liabilities principally related to
intellectual property and start-up costs approximating $200,300. These
liabilities were paid during 1994. In 1995, Iasys was merged into the Company.
 
     Actigen, Inc.: In December 1994, the Company acquired all of the
outstanding common stock of Actigen, Inc. (Actigen). The purchase price
consisted of issuing 62,674 shares of the Company's Series A Preferred Stock
valued at an aggregate of $206,824, a note payable of $42,500, and the
assumption of certain liabilities approximating $121,500. The note payable was
repaid in 1995. In 1996, Actigen was merged into the Company.
 
     The Company acquired all of the capital stock of Actigen and Iasys. In
conjunction with these acquisitions, assets acquired and liabilities assumed
were as follows:
 
<TABLE>
            <S>                                                         <C>
            Fair value of assets and research and development
              acquired................................................  $573,018
            Fair value of preferred stock issued......................   206,824
            Fair value of common stock issued.........................     1,912
            Notes payable issued......................................    42,500
            Liabilities assumed.......................................   321,782
</TABLE>
 
                                      F-10
<PAGE>   87
 
                               CORIXA CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
3. SECURITIES AVAILABLE-FOR-SALE
 
     Securities available-for-sale consist of the following:
 
<TABLE>
<CAPTION>
                                                               GROSS        GROSS
                                                 MARKET      UNREALIZED   UNREALIZED    AMORTIZED
                                                  VALUE        GAINS        LOSSES        COST
                                               -----------   ----------   ----------   -----------
    <S>                                        <C>           <C>          <C>          <C>
    December 31, 1995
    U.S. Treasury obligations................  $ 7,768,727    $ 14,338     $  (1,109)  $ 7,755,498
                                               ===========     =======      ========   ===========
    December 31, 1996
    U.S. Treasury obligations................  $ 9,845,180    $    842     $ (12,750)  $ 9,857,088
                                               ===========     =======      ========   ===========
    June 30, 1997
    U.S. Treasury obligations................  $14,751,336    $      7     $ (41,835)  $14,793,164
                                               ===========     =======      ========   ===========
</TABLE>
 
     There were no realized gains or losses on sales of available-for-sale
securities for the years ended December 31, 1995 and 1996. All securities
available-for-sale mature within one year.
 
4. PROPERTY AND EQUIPMENT
 
     Property and equipment consists of the following:
 
<TABLE>
<CAPTION>
                                                               DECEMBER 31
                                                         -----------------------    JUNE 30,
                                                            1995         1996         1997
                                                         ----------   ----------   ----------
    <S>                                                  <C>          <C>          <C>
    Laboratory equipment...............................  $1,253,887   $2,088,170   $3,606,780
    Computers..........................................     170,188      370,471      500,909
    Leasehold improvements.............................     124,272      628,940    1,114,263
                                                         -----------  ----------   ----------
                                                          1,548,347    3,087,581    5,221,952
    Accumulated depreciation and amortization..........     279,279      850,385    1,304,820
                                                         -----------  ----------   ----------
                                                         $1,269,068   $2,237,196   $3,917,132
                                                         ===========  ==========   ==========
</TABLE>
 
     At December 31, 1996 and June 30, 1997, the Company held equipment under
capitalized leases with an original cost of $2,295,831 and $3,991,782,
respectively, and a net book value of $1,595,970 and $2,891,924, respectively.
These leases are secured by the underlying assets.
 
5. STOCKHOLDERS' EQUITY
 
  Convertible Preferred Stock
 
     Holders of shares of Series A Preferred Stock and Series B Preferred Stock
(Series A shares and Series B shares) are entitled to receive cash dividends at
the rate of $0.26 per share and $0.79 per share, respectively. Such dividends
shall be payable only when, as, and if declared by the Board and shall be
noncumulative. As of June 30, 1997, the Board has not declared any dividends.
 
     Series A shares and Series B shares are entitled to equal votes with the
common stock on ordinary course matters and have the right to vote separately as
a single class on certain material events, and, at the option of the holder, may
be converted at any time into common stock. The conversion ratios at December
31, 1996 and June 30, 1997 were 1-for-1. The conversion rate may be adjusted
from time to time, based on provisions included in the Company's Amended and
Restated Certificate of Incorporation. Each Series A share and Series B share
shall be converted into shares of common stock, based on the then-effective
respective conversion prices of the Series A shares and Series B shares,
automatically upon the closing of a firmly underwritten public offering pursuant
to an effective registration statement under the Securities Act of 1933,
 
                                      F-11
<PAGE>   88
 
                               CORIXA CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
as amended, covering the offer and sale of Common Stock for the account of the
Company in which the per share price is at least $23.10 and the gross cash
proceeds to the Company are at least $10,000,000, or upon the consent of a
majority of the holders of such shares, which consent the Company has solicited
and received; see Note 11.
 
     Series A shares and B shares also have preferential liquidation rights over
common stock. In the event of liquidation, holders of Series A shares shall be
entitled to be paid out of the assets of the Company an amount per share equal
to the sum of $3.30 per share, plus all declared and unpaid dividends, if any.
After the payment of the full liquidation preference of the Series A shares, the
holders of Series B shares shall be entitled to be paid out of the assets of the
Company legally available for distribution, an amount per share equal to the sum
of $9.90 per share plus all declared and unpaid dividends on such shares. Any
remaining assets of the Company shall be distributed ratably to the holders of
the common stock, Series A shares, and Series B shares, up to an aggregate of
$9.90 per common share and $29.70 per share for Series A shares and Series B
shares, respectively, on an as if converted to common stock basis.
 
  Stock Option Plan
 
     The Company has a stock option plan under which an aggregate of 1,310,981
shares of common stock were reserved for grants to employees, members of the
Board of Directors, and consultants. Options granted under this plan may be
designated as incentive or nonqualified at the discretion of the Plan
Administrator. Refer to Note 11 for the July 1997 amendment to the Plan.
 
     Generally, the options vest over a four-year period with 25% vesting in the
first year and the remainder vesting monthly thereafter. All options expire no
later than ten years from the date of grant. Incentive stock options are
exercisable at not less than the fair market value of the stock at the date of
grant, and nonqualified stock options are exercisable at prices determined at
the discretion of the Plan Administrator, but not less than 85% of the fair
market value of the stock at the date of grant. The Plan allows option holders
to exercise options prior to vesting, but the stock received is subject to
repurchase by the Company at the original purchase price in the event of
termination. The repurchase rights expire according to the original option
vesting terms.
 
     A summary of the Company's stock option activity and related information
follows:
 
<TABLE>
<CAPTION>
                                                                                    WEIGHTED
                                                   SHARES UNDER                     AVERAGE
                                                   OUTSTANDING       PRICE PER      EXERCISE
                                                     OPTIONS           SHARE         PRICE
                                                  --------------     ----------     --------
        <S>                                       <C>                <C>            <C>
          Options granted.....................         167,127       $     0.33      $ 0.33
                                                     ---------          -------         ---
        Balance at December 31, 1994..........         167,127             0.33        0.33
          Options granted.....................         341,643             0.33        0.33
          Options canceled....................         (11,969)            0.33        0.33
                                                     ---------          -------         ---
        Balance at December 31, 1995..........         496,801             0.33        0.33
          Options granted.....................         182,413        0.33-0.99        0.58
          Options exercised...................         (67,999)            0.33        0.33
          Options canceled....................          (6,090)       0.33-0.99        0.38
                                                     ---------          -------         ---
        Balance at December 31, 1996..........         605,125        0.33-0.99        0.40
          Options granted (unaudited).........         645,004             0.99        0.99
          Options exercised (unaudited).......         (49,329)       0.33-0.99        0.56
          Options canceled (unaudited)........         (13,186)       0.33-0.99        0.50
                                                     ---------          -------         ---
        Balance at June 30, 1997
          (unaudited).........................       1,187,614        0.33-0.99        0.71
                                                     =========          =======         ===
</TABLE>
 
                                      F-12
<PAGE>   89
 
                               CORIXA CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
     Deferred compensation of approximately $3.9 million was recorded during the
six months ended June 30, 1997 representing the difference between the exercise
prices of options granted during that period and the deemed fair market value.
 
     Options considered fully vested as of December 31, 1995, 1996, and June 30,
1997 were 48,048, 246,806, and 378,334, respectively, at weighted average
exercise prices of $0.33, $0.34, and $0.41, respectively. Options exercised as
of December 31, 1996 and June 30, 1997 for which the underlying stock continues
to be restricted amounted to 34,281 and 56,969, respectively. The weighted
average remaining contractual life of the outstanding options at December 31,
1995 and 1996 was 9.3 years and 8.6 years, respectively. At December 31, 1996
and June 30, 1997, options for 637,857 shares and 6,039 shares, respectively,
remain available for grant.
 
     The weighted average fair value of options granted during 1995 and 1996 was
$0.11 and $0.17 per option, respectively.
 
     Pro forma information regarding net income and earnings per share required
by Statement 123 has been determined as if the Company had accounted for its
employee stock options under the fair value method of that Statement. The fair
value for these options was estimated at the date of grant using a Black-Scholes
option pricing model with the following weighted-average assumptions on the
option grant date: risk-free interest rates of 6.3% to 6.5%, expected volatility
of 0.0%, expected option life of four years, and a dividend yield of 0.0%
 
     Under Statement 123, if the Company had elected to recognize the
compensation cost based upon the fair value of the options granted at the grant
date, net income would have been reduced as follows (the estimated fair value of
the options is amortized to expense over the options' vesting period or upon the
achievement of certain milestones):
 
<TABLE>
<CAPTION>
                                                          YEAR ENDED DECEMBER 31,
                                                        ---------------------------
                                                           1995            1996
                                                        -----------     -----------
            <S>                                         <C>             <C>
            Net loss:
              As reported.............................  $(4,149,973)    $(4,146,763)
              Pro forma...............................  $(4,158,556)    $(4,170,558)
            Net loss per share:
              As reported.............................    $(1.24)         $(1.23)
              Pro forma...............................    $(1.24)         $(1.24)
</TABLE>
 
     The Statement 123 pro forma disclosures above are not necessarily
indicative of future pro forma disclosures because of the manner in which
Statement 123 calculations are phased in over time.
 
  Stock Warrants
 
     In connection with sales of Series A shares in 1995 and 1994, the Company
issued stock warrants to certain stockholders at an aggregate purchase price of
$0.003 per share to purchase 413,191 shares of common stock at an exercise price
of $0.33 per share. These warrants expire in 2004 and 2005.
 
     During 1996, the Company issued warrants to purchase 114,342 shares of
common stock at exercise prices ranging from $0.003 to $6.60 per share and
163,636 Series A shares at an exercise price of $6.60 per share. These warrants
were issued in connection with certain collaborative agreements and the leasing
of office and research facilities. The weighted average grant-date fair value
ranged from $0.99 to negligible per share, and negligible per share for common
stock and Series A shares, respectively. Vesting of 75,757 warrants to purchase
common stock and 163,636 warrants to purchase Series A shares is contingent upon
the achievement of certain milestones. The Company has recognized research and
development expense for the calculated fair
 
                                      F-13
<PAGE>   90
 
                               CORIXA CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
value of those warrants (warrants to purchase 61,321 and 42,424 common shares
and Series A shares, respectively) for which milestone achievement was deemed
probable by management at December 31, 1996. Final valuation will be calculated
at the actual achievement of these milestones based on the fair value of the
underlying stock at that date.
 
     Warrants to purchase 31,818 shares of Series A Preferred Stock were issued
in 1994. (See Note 7.) Warrants to purchase 454,533 shares of Series B Preferred
Stock were issued in 1996. (See Note 9.)
 
     Total common stock, Series A share and Series B share warrants outstanding
at December 31, 1996 and June 30, 1997 were 527,533, 195,454, and 454,533,
respectively, at weighted average exercise prices of $2.24, $6.07, and $9.90 per
share, respectively.
 
  Stock Repurchase Agreements
 
     Since its inception, the Company has sold approximately 945,185 shares of
common stock at a price of $0.017 per share to employees and scientific founders
of the Company under agreements which allow the Company, at its option, to
repurchase the shares at the original purchase price if the employment or
consulting relationship with the Company ceases for any reason. Under the
repurchase agreements, the shares subject to repurchase are generally reduced in
cumulative pro rata increments over a four-year period beginning at the issuance
date. As of December 31, 1996 and June 30, 1997, 413,516 shares and 295,369
shares, respectively, were subject to repurchase.
 
     Under the terms of all of the repurchase agreements, if the Company is
acquired by merger, consolidation, or sale of assets, the repurchase agreements
will cease to apply.
 
  Shares Reserved
 
     Common stock was reserved for the following purposes:
 
<TABLE>
<CAPTION>
                                                                DECEMBER 31,     JUNE 30,
                                                                    1996           1997
                                                                ------------     ---------
    <S>                                                         <C>              <C>
    Conversion of preferred stock.............................    5,151,181      5,151,181
    Warrants to purchase preferred stock which are convertible
      to common...............................................      649,987        649,987
    Stock options.............................................    1,242,982      1,193,653
    Warrants to purchase common stock.........................      527,533        527,533
    License, technology, and patent rights agreements.........       54,545         34,848
                                                                 ----------      ----------
                                                                  7,626,228      7,557,202
</TABLE>
 
6. INCOME TAXES
 
     At December 31, 1996 and June 30, 1997, the Company had net operating loss
carryforwards of approximately $7,490,000 and $6,621,000, respectively, and
research and experimentation credit carryforwards of approximately $314,000 and
$908,000, respectively, which are available to offset future federal taxable
income and income taxes, respectively, if any, through 2009. Utilization of
federal income tax and research and development tax credit carryforwards is
subject to limitations under applicable regulations in effect under the Internal
Revenue Code of 1986, as amended. Accordingly, the Company's use of losses
incurred through the date of this ownership change may be limited during the
carryforward period.
 
     Deferred income taxes reflect the net tax effects of temporary differences
between the carrying amounts of assets and liabilities for financial reporting
purposes and the amounts used for income tax purposes. The Company has
recognized a valuation allowance equal to the deferred tax assets due to the
uncertainty of
 
                                      F-14
<PAGE>   91
 
                               CORIXA CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
realizing the benefits of the assets. The valuation allowance for deferred tax
assets increased $1,528,000, $1,475,000, and $396,000 during 1995, 1996, and the
six months ended June 30, 1997, respectively. The effects of temporary
differences that give rise to deferred tax assets are as follows:
 
<TABLE>
<CAPTION>
                                                          DECEMBER 31
                                                  ---------------------------      JUNE 30,
                                                     1995            1996            1997
                                                  -----------     -----------     -----------
    <S>                                           <C>             <C>             <C>
    Deferred tax assets:
      Net operating loss carryforwards..........  $ 1,565,000     $ 2,547,000     $ 2,251,000
      Research and experimentation credit and
         foreign tax credit carryforwards.......      144,000         339,000         933,000
      Deferred revenue..........................      140,000         448,000         457,000
      Other.....................................       15,000          33,000         112,000
                                                  -----------     -----------     -----------
                                                    1,864,000       3,367,000       3,753,000
    Deferred tax liabilities:
      Depreciation..............................        6,000          34,000          24,000
                                                  -----------     -----------     -----------
      Net deferred tax asset....................    1,858,000       3,333,000       3,729,000
      Less valuation allowance..................   (1,858,000)     (3,333,000)     (3,729,000)
                                                  -----------     -----------     -----------
    Net deferred tax assets.....................  $         0     $         0     $         0
                                                  ===========     ===========     ===========
</TABLE>
 
7. LONG-TERM OBLIGATIONS AND COMMITMENTS
 
<TABLE>
<CAPTION>
                                                          DECEMBER 31
                                                  ---------------------------      JUNE 30,
                                                     1995            1996            1997
                                                  -----------     -----------     -----------
    <S>                                           <C>             <C>             <C>
    Capital lease obligations...................  $ 1,092,824     $ 1,663,112     $ 2,893,985
    Advance from corporate partner..............           --              --       3,000,000
                                                  -----------     -----------     -----------
                                                    1,092,824       1,663,112       5,893,985
    Less current portion of capital lease
      obligations...............................      276,936         487,758         808,162
                                                  -----------     -----------     -----------
                                                  $   815,888     $ 1,175,354     $ 5,085,823
                                                  ===========     ===========     ===========
</TABLE>
 
     In December 1994, the Company entered into a master lease agreement to
lease certain equipment. In connection with the draw down of the this lease line
in 1994, the Company issued the lessor warrants to purchase 31,818 shares of the
Company's Series A Preferred Stock at $3.30 per share. The term of the warrants
is either ten years from the date of issuance or five years from the effective
date of an initial public offering by the Company, whichever is longer. The term
may expire sooner if certain conditions, as defined in the warrant agreement,
are met.
 
     A $1,500,000 lease line was obtained in 1996, of which approximately
$1,200,000 remained available at December 31, 1996. In March 1997, the remaining
lease line was renegotiated to $1,450,000, of which approximately $721,000
remained available at June 30, 1997. Both leases are secured by the underlying
equipment.
 
     The $3 million advance from the corporate partner at June 30, 1997
represents payments received in exchange for options to license two of Corixa's
early-state cancer targets. Refer to Note 8 with regard to the future
application of the advance.
 
     The Company rents office and research facilities under noncancelable
operating leases which expire in January 2005. The Company has issued an
irrevocable standby letter of credit in the amount of $750,000 as security
deposit on the lease. The Company has options to renew the lease for two
additional terms of five years each.
 
                                      F-15
<PAGE>   92
 
                               CORIXA CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
     Minimum future rental payments under all lease agreements at December 31,
1996 are as follows:
 
<TABLE>
<CAPTION>
                                                                  CAPITAL        OPERATING
                      YEAR ENDED DECEMBER 31,                      LEASES         LEASES
    -----------------------------------------------------------  ----------     -----------
    <S>                                                          <C>            <C>
    1997.......................................................  $  635,371     $ 1,024,606
    1998.......................................................     693,132       1,319,393
    1999.......................................................     457,571       2,424,681
    2000.......................................................     187,443       2,514,227
    2001.......................................................          --       2,589,654
    Thereafter.................................................          --       8,332,779
                                                                 ----------     -----------
    Total minimum payments.....................................   1,973,517     $18,205,340
                                                                                ===========
    Less interest..............................................     310,405
                                                                 ----------
    Present value of minimum lease payments....................   1,663,112
    Less current portion.......................................     487,758
                                                                 ----------
    Capital lease obligations, less current portion............  $1,175,354
                                                                 ==========
</TABLE>
 
     Rent expense was $364,240, $638,037, and $768,803 for the years ended
December 31, 1995, 1996, and the six-month period ended June 30, 1997,
respectively.
 
8. SCIENTIFIC COLLABORATIVE AND LICENSE AGREEMENTS
 
     The Company has various collaborative research agreements with academic
universities and research institutions, which expire at various intervals
through 1999. Certain agreements stipulate the reimbursement by the Company of
research costs incurred by these universities and institutions on behalf of the
Company. Included in research and development expenses for the years ended
December 31, 1995 and 1996 and the six-month period ended June 30, 1997 are
reimbursements approximating $900,000, $1,400,000, and $827,000, respectively.
As of December 31, 1996, the Company is committed to reimburse the universities
and institutions $650,000 and $65,000 in 1997 and 1998, respectively. As of June
30, 1997, the Company is obligated to reimburse the universities and
institutions $348,000, $14,500, and $33,000 in 1997, 1998, and 1999,
respectively.
 
     The Company has entered into certain license agreements and obtained
options to negotiate license agreements under the terms of which the Company
received license, technology, and patent rights. During 1995 and 1996 and the
six-month period ended June 30, 1997, the Company paid initial license and/or
option fees approximating $80,000, $185,000, and $145,000, respectively, and
issued 36,363 and 33,328 shares of common stock during 1995 and 1996,
respectively, (plus a commitment to issue an additional 33,333 and 21,212
shares, respectively, upon the achievement of certain events of which 19,697
were issued in 1997) for such rights. In conjunction with certain 1996
collaboration agreements, the Company also issued options to purchase 129,393
shares of common stock and warrants to purchase 75,757 and 163,636 shares of
common stock and Series A Preferred Stock, respectively. See Note 5.
 
     Certain agreements call for royalty and milestone payments to be paid by
the Company. The agreements are for terms from 10 to 17 years or the expiration
of the last issued patent within the licensed technology, unless terminated
earlier for certain specified events, as defined in the respective agreements.
 
     Additionally, the Company has entered into research and license agreements
and granted options to other parties to negotiate license agreements under the
terms of which the Company provides license, technology, and patent rights.
Under the terms of the agreements, the Company will receive additional license
fees, option fees and/or reimbursement of certain research and development costs
through 1998. The agreements provide
 
                                      F-16
<PAGE>   93
 
                               CORIXA CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
for one-time payments upon the achievement of certain milestones and the payment
of royalties based on product sales.
 
     The Company entered into an agreement during 1997 with a third party
pursuant to which the third party agreed to advance consideration in exchange
for exclusive options to license two of Corixa's early-state programs in two
cancer targets (see Note 7). In the event such options are exercised, the
consideration will be credited against future milestone payments or converted to
common stock of Corixa, as per the agreement. If either or both of such options
are not exercised or extended between February 28, 1998 and August 18, 1998, the
Company will be required to refund the consideration over a three-year period
beginning March 2000.
 
9. INVESTMENTS IN AND AGREEMENTS WITH GENQUEST
 
     In February 1996, the Company entered a license and research collaboration
agreement with GenQuest, Inc., a Delaware corporation (GenQuest) for the purpose
of discovering, characterizing, developing, and commercializing novel genes for
use in the treatment, prevention, or diagnosis of cancer or pre-neoplastic cell
proliferation disease.
 
     In February 1996, the Company acquired an aggregate of 4,412,613 shares of
series A preferred stock of GenQuest in exchange for the transfer of certain
intellectual property rights in connection with the collaboration, which shares
represent approximately 16% of GenQuest's outstanding capital stock at December
31, 1996. As a result of its ownership of series A preferred stock of GenQuest,
the Company has certain registration rights with respect to public offerings of
GenQuest and rights of first offer which allow the Company to participate
ratably in future issuances of stock to maintain its ownership percentage of
GenQuest.
 
     Additionally, the Company is entitled to voting rights equivalent to the
number of shares of common stock of GenQuest into which such shares of series A
preferred stock can be converted and is a party to a voting agreement among
GenQuest and all but two of its stockholders. Under the terms of the voting
agreement, the Company has a right to designate two of seven nominees to the
Board of Directors of GenQuest and the stockholders of GenQuest who are parties
to the voting agreement have agreed to vote their shares in favor of such
nominees. The Company's right to designate such nominees will terminate when the
Company owns less than 10% of the voting capital stock of GenQuest.
 
   
     In December 1996, the Company and GenQuest amended the license and
collaboration agreement and, in connection with this amendment, entered into an
administrative services and management agreement. As part of the collaboration,
GenQuest has agreed to provide an aggregate of $5.7 million in funding in
support of certain research and development projects conducted by the Company
and GenQuest on a collaborative basis during a three year research term.
Additionally, the Company has agreed that certain administrative and management
services will be provided to GenQuest by certain Company employees, including
the Company's Chief Executive Officer, Chief Scientific Officer, and Chief
Operating Officer, and GenQuest has agreed to reimburse the Company for such
services. Either the Company or GenQuest may terminate the license agreement
within 30 days after December 31, 1997 if such party believes that the
scientific objectives of the collaboration have not been met.
    
 
     Under the license agreement, the Company and GenQuest agreed to
cross-license certain technologies and products owned or controlled by them as
of February 1996 and technologies and products developed under the collaborative
research program. The Company is required to pay GenQuest, when product sales
commence, certain royalties on sales of products that use technology licensed
from GenQuest, and GenQuest is required to pay the Company, when product sales
commence, certain royalties on the sale of products that use technology licensed
from the Company. In addition, sales of certain products developed by GenQuest
using technology developed by the Company in the collaborative research program
would be royalty-free.
 
                                      F-17
<PAGE>   94
 
                               CORIXA CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
     In December 1996, in connection with the modification of the collaboration
between the Company and GenQuest and the issuance of series B preferred stock of
GenQuest to additional investors (18,309,271 shares at $0.50 per share), the
Company, GenQuest and certain stockholders of GenQuest entered into a call
option agreement. Under the terms of this agreement, the Company has the right
to purchase a significant majority of the outstanding shares of GenQuest's
capital stock held by the stockholders of GenQuest at a purchase price
determined in accordance with a formula stipulated in the agreement. This right
becomes effective on the earlier of June 23, 1998, the completion of a 30-day
trading period following the Company's initial public offering during which the
average closing sale price of a share of the Company's common stock meets the
minimum requirement stipulated in the agreement, and a merger of the Company
with another entity or a sale of substantially all of the Company's assets, and
terminates on the earlier of January 23, 2000, the date that the Company
notifies GenQuest that it will not exercise this right, the closing of the
initial public offering of GenQuest, and 10 days following a merger of or sale
of assets by the Company.
 
     In conjunction with the relationship between the Company and GenQuest, the
Company issued warrants to purchase 454,533 shares of the Company's Series B
shares at a price of $9.90 per share. The warrants expire on the earlier of
December 23, 2001 or certain events as specified in the warrant agreements. A
receivable of $1.14 million from GenQuest, which represents the value of the
warrants, is included in equity at December 31, 1996. The receivable will be
paid over the three-year funding life of the current collaborative agreement out
of the proceeds therefrom. Amounts expected to be applied against the receivable
in 1997, 1998 and 1999 approximate $488,432, $325,784 and $325,784,
respectively.
 
     The Company's investment in GenQuest is recorded in the balance sheet at
$-0-, which was the historical cost of the technology exchanged for the
preferred stock of GenQuest issued to the Company. The Company did not recognize
the increased value of its equity investment resulting from the GenQuest
issuance of Series B preferred stock due to uncertainty regarding its ultimate
realization.
 
   
     In 1996, the Company recognized other income of $300,000 as a result of
administrative services provided to GenQuest.
    
 
   
     During the six months ended June 30, 1997, the Company recognized
collaborative revenue and research and development expenses of approximately
$831,000 and $1 million, respectively. In conjunction with its collaborative
agreement with GenQuest, the Company also recognized other income of
approximately $162,500 as a result of administrative services provided to
GenQuest during the six months ended June 30, 1997.
    
 
10. 401(K) PLAN
 
     The Company has a 401(k) defined contribution plan (the Plan), as defined
by the Internal Revenue Code. The Plan is for the benefit of all qualifying
employees and permits voluntary contributions (by the employees) of up to 15% of
their base salary (as defined by the Plan). Currently, the Company does not
match contributions.
 
   
11. SUBSEQUENT EVENTS
    
 
  Initial Public Offering
 
     On July 25, 1997, the Company's Board of Directors authorized the Company
to file a Registration Statement with the Securities and Exchange Commission to
permit the Company to proceed with an initial public offering of its common
stock (the Offering). In connection with the Offering, the Company's Board of
Directors and stockholders authorized a class of 10,000,000 shares of Preferred
Stock and approved a reverse stock split of the outstanding shares of common
stock and convertible preferred stock on the basis of one new share of stock for
every 3.3 outstanding shares of stock. The reverse stock split will become
effective at the time an Amended and Restated Certificate of Incorporation is
filed with the Secretary of State of the State of
 
                                      F-18
<PAGE>   95
 
                               CORIXA CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
Delaware. All outstanding convertible preferred stock, common and common
equivalent shares and per-share amounts in the accompanying financial statements
and related notes to financial statements have been retroactively adjusted to
give effect to the reverse stock split.
 
   
     In addition, in connection with the Offering, the Company has solicited and
received the consent of the holders of the Series A shares and Series B shares
to the automatic conversion of all of the outstanding Series A shares and Series
B shares upon the closing of the Offering. Immediately prior to the closing of
the Offering, all outstanding Series A shares will automatically convert into
4,646,131 shares of common stock and all of the outstanding Series B shares will
automatically convert to 505,050 shares of common stock (in each case subject to
adjustment upon the occurrence of certain dilutive events). Unaudited pro forma
stockholders' equity at June 30, 1997, as adjusted for the assumed conversion of
the Series A shares and Series B shares, is set forth in the accompanying
balance sheet.
    
 
  Amended Stock Option Plan
 
     On July 25, 1997, the Company amended and restated the 1994 Plan, whereby
the number of shares authorized under the 1994 Plan was increased by 700,000
shares and is subject to automatic increase on the first trading day of each of
the ten calendar years beginning in 1998 and ending in 2007, in an amount equal
to 3% of the number of shares of common stock outstanding on December 31 of the
immediately preceding calendar year, up to a maximum of 500,000 shares each year
over the ten-year period.
 
  1997 Employee Stock Purchase Plan
 
     On July 25, 1997, the Company adopted the 1997 Employee Stock Purchase Plan
(the Purchase Plan). A total of 125,000 shares of common stock are reserved for
issuance under the Purchase Plan. The Purchase Plan permits eligible employees
to purchase common stock through payroll deductions at a price equal to 85% of
the fair market value of the Company's common stock on the first day or the last
day of the applicable six-month offering period, whichever is lower. The
Purchase Plan will begin on the effective date of the Company's initial public
offering.
 
     The number of authorized shares is subject to automatic increase on the
first trading day of each of the 20 calendar years beginning in 1998 and ending
in 2017. If the number of shares reserved for issuance is less than 1% of the
outstanding common stock, the number of shares reserved for issuance shall be
increased until it equals 1% of the outstanding common stock (up to a maximum of
125,000 in any calendar year), or such lower amount as determined by the Board
of Directors. The Board of Directors has the power to amend or terminate the
Purchase Plan as long as such action does not adversely affect any outstanding
rights to purchase stock thereunder. If not terminated earlier, the Purchase
Plan will have a term of 20 years.
 
  1997 Directors' Stock Option Plan
 
     The Directors' Plan was adopted by the Company on July 25, 1997. A total of
200,000 shares of common stock has been reserved for issuance under the
Directors' Plan. The number of authorized shares is subject to automatic
increase, on the first trading day of each of the five calendar years beginning
in 1998 and ending in 2002 in an amount equal to 50,000 shares of common stock
or such lesser amount as the Board of Directors may establish. The Directors'
Plan provides for the grant of nonqualified stock options (NSOs) to nonemployee
directors of the Company. The Directors' Plan provides that each person who is a
nonemployee director on the date of the offering and each person who first
becomes a nonemployee director of the Company after the date of the offering
shall be granted NSOs to purchase 15,000 shares of common stock (the First
Option). Thereafter, on the date of each annual meeting of the Company's
stockholders, commencing in 1998, each nonemployee director shall be
automatically granted an additional option to purchase 5,000 shares of common
stock (a Subsequent Option) if, on such date, he or she shall have served on the
Company's Board of
 
                                      F-19
<PAGE>   96
 
                               CORIXA CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
Directors for at least six months. The First Options and Subsequent Options
generally vest over 36 and 12 months, respectively, and have 10-year terms. The
exercise price of such options shall be equal to the fair market value of the
Company's common stock on the date of grant of the option. The Plan has a
10-year term unless terminated earlier.
 
                                      F-20
<PAGE>   97
 
======================================================
 
     NO DEALER, SALESPERSON OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS,
AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED
UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY OR THE UNDERWRITERS. THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER OF ANY SECURITIES OTHER THAN THOSE TO
WHICH IT RELATES OR AN OFFER TO SELL, OR A SOLICITATION OF AN OFFER TO BUY, TO
ANY PERSON IN ANY JURISDICTION WHERE SUCH AN OFFER OR SOLICITATION WOULD BE
UNLAWFUL. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY OFFER OR SALE MADE
HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS
BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY OR THAT THE INFORMATION CONTAINED
HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE HEREOF.
 
                               ------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                        PAGE
                                        -----
<S>                                     <C>
Prospectus Summary..................       3
Risk Factors........................       6
Use of Proceeds.....................      18
Dividend Policy.....................      18
Capitalization......................      19
Dilution............................      20
Selected Financial Data.............      21
Management's Discussion and Analysis
  of Financial Condition and Results
  of Operations.....................      22
Business............................      26
Management..........................      52
Certain Transactions................      60
Principal Stockholders..............      63
Description of Capital Stock........      65
Shares Eligible for Future Sale.....      69
Underwriting........................      71
Legal Matters.......................      72
Experts.............................      73
Additional Information..............      73
Glossary of Scientific Terms........      74
Index to Financial Statements.......     F-1
</TABLE>
 
                               ------------------
 
     UNTIL        , 1997 (25 DAYS AFTER THE EFFECTIVE DATE OF THIS PROSPECTUS),
ALL DEALERS EFFECTING TRANSACTIONS IN THE COMMON STOCK, WHETHER OR NOT
PARTICIPATING IN THIS DISTRIBUTION, MAY BE REQUIRED TO DELIVER A PROSPECTUS.
THIS IS IN ADDITION TO THE OBLIGATION OF DEALERS TO DELIVER A PROSPECTUS WHEN
ACTING AS UNDERWRITERS AND WITH RESPECT TO THEIR UNSOLD ALLOTMENTS OR
SUBSCRIPTIONS.
 
======================================================
======================================================
 
                                2,750,000 SHARES
 
                                 [CORIXA LOGO]
 
                               CORIXA CORPORATION
 
                                  COMMON STOCK
 
                          ---------------------------
                                   PROSPECTUS
                                        , 1997
 
                          ---------------------------
                                LEHMAN BROTHERS
                            INVEMED ASSOCIATES, INC.
                     VECTOR SECURITIES INTERNATIONAL, INC.
 
======================================================
<PAGE>   98
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
     The following table sets forth the costs and expenses, other than
underwriting discounts and commissions, payable by the Company in connection
with the sale of Common Stock being registered. All amounts are estimates except
the SEC registration fee and the NASD filing fee.
 
<TABLE>
<CAPTION>
                                                                              AMOUNT
                                                                            TO BE PAID
                                                                            ----------
        <S>                                                                 <C>
        SEC registration fee..............................................   $  13,417
        NASD filing fee...................................................       4,928
        Nasdaq listing fee................................................      44,986
        Printing and engraving expenses...................................     205,000
        Legal fees and expenses...........................................     330,000
        Accounting fees and expenses......................................     160,000
        Blue Sky qualification fees and expenses..........................       5,000
        Transfer Agent and Registrar fees.................................      10,500
        Miscellaneous fees and expenses...................................      26,169
                  Total...................................................   $ 800,000
</TABLE>
 
- ---------------
 
* To be filed by amendment.
 
ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     As permitted by Section 145 of the Delaware General Corporation Law, the
Registrant's Restated Certificate of Incorporation includes a provision that
eliminates the personal liability of its directors for monetary damages for
breach or alleged breach of their duty of care. In addition, as permitted by
Section 145 of the Delaware General Corporation Law, the Bylaws of the
Registrant provide that: (i) the Registrant is required to indemnify its
directors, to the fullest extent permitted by Delaware law, including in those
circumstances in which indemnification would otherwise be discretionary; (ii)
the Registrant may, in its discretion, indemnify officers, employees and agents
in those circumstances where indemnification is not required by law; (iii) the
Registrant is required to advance expenses, as incurred, to its directors in
connection with defending a proceeding (except that it is not required to
advance expenses to a person against whom the Registrant brings a claim for
breach of the duty of loyalty, failure to act in good faith, intentional
misconduct, knowing violation of law or deriving an improper personal benefit);
(iv) the rights conferred in the Bylaws are not exclusive, and the Registrant is
authorized to enter into indemnification agreements with its directors,
executive officers and employees; and (v) the Registrant may not retroactively
amend the Bylaw provisions in a way that it adverse to such directors, executive
officers and employees.
 
     The Registrant's policy is to enter into indemnification agreements with
each of its directors that provide the maximum indemnity allowed to directors
and executive officers by Section 145 of the Delaware General Corporation Law
and the Bylaws, as well as certain additional procedural protections. In
addition, such indemnity agreements provide that directors will be indemnified
to the fullest possible extent not prohibited by law against all expenses
(including attorney's fees) and settlement amounts paid or incurred by them in
any action or proceeding, including any derivative action by or in the right of
the Registrant, on account of their services as directors or executive officers
of the Registrant or as directors or officers of any other Company or enterprise
when they are serving in such capacities at the request of the Registrant. The
Company will not be obligated pursuant to the indemnity agreements to indemnify
or advance expenses to an indemnified party with respect to proceedings or
claims initiated by the indemnified party and not by way of defense, except with
respect to proceedings specifically authorized by the Board of Directors or
brought to enforce a right to indemnification under the indemnity agreement, the
Company's Bylaws or any statute or law. Under the agreements, the Company is not
obligated to indemnify the indemnified party (i) for any expenses incurred by
 
                                      II-1
<PAGE>   99
 
the indemnified party with respect to any proceeding instituted by the
indemnified party to enforce or interpret the agreement, if a court of competent
jurisdiction determines that each of the material assertions made by the
indemnified party in such proceeding was not made in good faith or was
frivolous; (ii) for any amounts paid in settlement of a proceeding unless the
Company consents to such settlement; (iii) with respect to any proceeding
brought by the Company against the indemnified party for willful misconduct,
unless a court determines that each of such claims was not made in good faith or
was frivolous; (iv) on account of any suit in which judgment is rendered against
the indemnified party for an accounting of profits made from the purchase or
sale by the indemnified party of securities of the Company pursuant to the
provisions of Section 16(b) of the Exchange Act and related laws; (v) on account
of the indemnified party's conduct which is finally adjudged to have been
knowingly fraudulent or deliberately dishonest, or to constitute willful
misconduct or a knowing violation of the law; (vi) an account of any conduct
from which the indemnified party derived an improper personal benefit; (vii) on
account of conduct the indemnified party believed to be contrary to the best
interests of the Company or its stockholders; (viii) on account of conduct that
constituted a breach of the indemnified party's duty of loyalty to the Company
or its stockholders; or (ix) if a final decision by a court having jurisdiction
in the matter shall determine that such indemnification is not lawful.
 
     The indemnification provision in the Bylaws and the indemnification
agreements entered into between the Registrant and its directors, may be
sufficiently broad to permit indemnification of the Registrant's directors for
liabilities arising under the Securities Act.
 
ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES
 
     (a) Since September 8, 1994 (the date of incorporation of the Company), the
Company has issued and sold the following securities:
 
          1. In September 1994, the Company issued and sold an aggregate of
     2,338,048 shares of Common Stock to nine founders at a purchase price of
     $0.017 per share.
 
          2. On September 30, 1994, the Company issued 115,863 shares of Common
     Stock in connection with the merger of Iasys Corporation with and into the
     Company, in addition the Company repurchased 3,333 shares of common stock
     from Iasys.
 
          3. From September 30, 1994 to March 31, 1995, the Company issued and
     sold, pursuant to a Series A Preferred Stock Purchase Agreement, an
     aggregate of 4,646,131 shares of Series A Preferred Stock to 16 investors
     at a purchase price of $3.30 per share.
 
          4. From December 2, 1994 to January 4, 1995, the Company issued
     warrants to purchase an aggregate of 413,191 shares of Common Stock at an
     exercise price of $0.33 per share.
 
          5. On December 9, 1994, January 1, 1996 and April 1, 1996, the Company
     issued warrants to purchase an aggregate of 195,454 shares of Series A
     Preferred Stock at exercise prices ranging from $3.30 to $6.60.
 
   
          6. From January 1, 1995 to August 20, 1997, the Company issued 77,264
     shares of Common Stock at values ranging from $0.33 per share to $8.25 per
     share in connection with the entering into of certain collaboration
     agreements and the reaching of certain milestones or other events pursuant
     to such agreements.
    
 
          7. On October 1, 1995, the Company transferred 5,871 shares of Common
     Stock to the Seattle Biomedical Research Institute ("SBRI") and an
     individual affiliated with SBRI, 2,537 of which represent a new issuance,
     in exchange for certain intellectual property rights.
 
          8. On May 10, 1996, the Company issued and sold, pursuant to a Series
     B Preferred Stock Purchase Agreement, an aggregate of 505,050 shares of
     Series B Preferred Stock to one investor at a per share price of $9.90.
 
          9. On May 20, 1996 and May 31, 1996, the Company issued warrants to
     purchase 38,585 shares of Common Stock at an exercise price of $6.60 per
     share.
 
                                      II-2
<PAGE>   100
 
          10. On May 22, 1996, the Company issued a warrant to purchase 75,757
     shares of Common Stock at an exercise price of $0.003 per share.
 
          11. On December 23, 1996, the Company issued warrants to each holder
     of Series B Preferred Stock of GenQuest to purchase up to an aggregate of
     454,533 shares of the Company's Series B Preferred Stock at an exercise
     price of $9.90 per share.
 
   
          12. From February 1, 1996 through June 30, 1997, the Company issued
     117,327 shares of Common Stock at a weighted average exercise price of
     $0.43 per share to eleven employees, directors and consultants, pursuant to
     the exercise of stock options granted under the 1994 Plan.
    
 
     The sales and issuances of securities in the transaction described in
paragraphs 1-10 were deemed to be exempt from registration under the Securities
Act of 1933, as amended (the "Securities Act") in reliance on Section 4(2) of
the Securities Act or Regulation D promulgated thereunder as transactions by an
issuer not involving a public offering. The sales and issuances of securities in
the transaction described in paragraph 11 were deemed to be exempt from
registration under the Securities Act, by virtue of Rule 701 promulgated
thereunder in that they were offered and sold either pursuant to written
compensatory benefit plans or pursuant to a written contract relating to
compensation, as provided by Rule 701. The recipients of securities in each such
transaction represented their intentions to acquire the securities for
investment only and not with a view to or for sale in connection with any
distribution thereof, and appropriate legends were affixed to the share
certificates, options and warrants issued in such transactions. All recipients
had adequate access, through their employment or other relationships with the
Company, to information about the Company.
 
     (b) There were no underwritten offerings employed in connection with any of
the transactions set forth in Item 15(a).
 
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
(a) Exhibits
 
   
<TABLE>
<CAPTION>
    NUMBER                                       DESCRIPTION
    -------     -----------------------------------------------------------------------------
    <C>         <S>
      1.1*      Form of Underwriting Agreement
      3.1       Amended and Restated Certificate of Incorporation of Registrant
      3.2       Form of Amended and Restated Certificate of Incorporation of Registrant to be
                filed with the Delaware Secretary of State
      3.3*      Bylaws of Registrant
      4.1*      Specimen Common Stock Certificate
      5.1*      Opinion of Venture Law Group, A Professional Corporation
     10.1*      1994 Amended and Restated Stock Option and Restricted Stock Plan and forms of
                stock purchase and stock option agreement
     10.2*      1997 Directors' Stock Option Plan and form of stock option agreement
     10.3*      1997 Employee Stock Purchase Plan and form of subscription agreement
     10.4*      Corixa Corporation 401(k) Savings & Retirement Plan
     10.5*      Form of Indemnification Agreement
     10.6*      Amended and Restated Investors' Rights Agreement dated as of May 10, 1996
                between Registrant and certain holders of its capital stock
     10.7*      Lease Agreement dated October 28, 1994 and amended December 29, 1995 between
                Registrant and Fred Hutchinson Cancer Research Center
     10.8*      Lease Agreement dated May 31, 1996 between Registrant and Health Science
                Properties, Inc.
     10.9+      Tuberculosis Collaboration and License Agreement between Registrant and
                SmithKline Beecham Biologicals S.A. dated October 6, 1995
    10.10+*     Tuberculosis Collaboration and License Agreement Extension between Registrant
                and SmithKline Beecham Biologicals S.A. dated February 25, 1997
</TABLE>
    
 
                                      II-3
<PAGE>   101
 
   
<TABLE>
<CAPTION>
    NUMBER                                       DESCRIPTION
    -------     -----------------------------------------------------------------------------
    <C>         <S>
     10.11+     Option Agreement between Registrant and SmithKline Beecham Biologicals S.A.
                dated March 1, 1997
    10.12+*     Special Biologicals and Material Transfer Agreement between Registrant and
                SmithKline Beecham Biologicals S.A. dated March 1, 1997
     10.13+     Breast Cancer Collaboration and License Agreement between Registrant and
                SmithKline Beecham Biologicals S.A. dated March 1, 1997
     10.14+     Prostate Cancer Collaboration and License Agreement between Registrant and
                SmithKline Beecham Biologicals S.A. dated March 1, 1997
     10.15+     Research Collaboration and License Agreement between Registrant and CellPro,
                Incorporated dated November 1, 1995
    10.16+*     First Amendment to Research Collaboration and License Agreement between
                Registrant and CellPro, Incorporated dated January 1, 1997
    10.17+*     Research Agreement between Registrant and ZymoGenetics, Inc. dated September
                30, 1996
     10.18+     Licensing Agreement between Registrant and Dana-Farber Cancer Institute, Inc.
                dated January 1, 1995
     10.19+     License, Development and Supply Agreement between Registrant and Abbott
                Laboratories dated July 24, 1997
     10.20+     Option and License Agreement between Registrant and Pasteur Merieux Connaught
                dated December 23, 1996
     10.21*     Amendment to Option and License Agreement between Registrant and Pasteur
                Merieux Connaught dated March 28, 1997
     10.22+     Amended and Restated License and Research Collaboration Agreement dated
                December 23, 1996 between Registrant and GenQuest, Inc.
    10.23+*     Amendment No. 1 to the Amended and Restated License and Research
                Collaboration Agreement dated January 1, 1997 by and between Registrant and
                GenQuest, Inc.
     10.24      Form of Amended and Restated Call Option Agreement dated December 23, 1996 by
                and among Registrant, GenQuest, Inc. and investors of GenQuest listed on
                Exhibit A thereto
     10.25+     Amended and Restated Administrative Services and Management Agreement dated
                December 23, 1996 by and between Registrant and GenQuest, Inc.
     10.26+     Amended and Restated Research Services and Intellectual Property Agreement
                effective as of January 1, 1997 by and between Registrant and the Infectious
                Disease Research Institute
     10.27+     License Agreement dated November 20, 1995 by and between Registrant and
                Health Research, Inc.
     10.28*     Amendment No. 1 to License Agreement dated January 1, 1997 by and between
                Registrant and Health Research, Inc.
     10.29+     License Agreement dated May 22, 1996 by and among Registrant, Southern
                Research Institute and University of Alabama at Birmingham Research
                Foundation
    10.30+*     Amendment No. 1 to License Agreement dated April 30, 1997 by and among
                Registrant, Southern Research Institute and University of Alabama at
                Birmingham Research Foundation
     11.1*      Statement of Computation of Pro Forma Net Loss Per Share
     23.1       Consent of Ernst & Young LLP, Independent Auditors
     23.2       Consent of KPMG Peat Marwick LLP, Independent Auditors
     23.3*      Consent of Venture Law Group, A Professional Corporation (included in Exhibit
                5.1)
     24.1*      Power of Attorney (see page II-6)
     27.1*      Financial Data Schedule
</TABLE>
    
 
- ---------------
* Previously filed.
+ Confidential treatment requested.
 
                                      II-4
<PAGE>   102
 
(b) Financial Statement Schedule
 
     Schedule II -- Valuation and Qualifying Accounts
 
     Schedules not listed above have been omitted because the information
required to be set forth therein is not applicable or is shown in the financial
statements or notes thereto.
 
ITEM 17. UNDERTAKINGS
 
     The undersigned hereby undertakes to provide to the Underwriters at the
closing specified in the Underwriting Agreement, certificates in such
denominations and registered in such names as required by the Underwriters to
permit prompt delivery to each purchaser.
 
     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the provisions referenced in Item 14 of this Registration
Statement or otherwise, the Registrant has been advised that in the opinion of
the Commission such indemnification is against public policy as expressed in the
Securities Act, and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer, or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered hereunder, the Registrant will,
unless in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the
Securities Act and will be governed by the final adjudication of such issue.
 
     The undersigned Registrant hereby undertakes that:
 
          (1) For purposes of determining any liability under the Securities
     Act, the information omitted from the form of Prospectus filed as part of
     this Registration Statement in reliance upon Rule 430A and contained in a
     form of Prospectus filed by the Registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act shall be deemed to be part of this
     Registration Statement as of the time it was declared effective.
 
          (2) For the purpose of determining any liability under the Securities
     Act, each post-effective amendment that contains a form of Prospectus shall
     be deemed to be a new Registration Statement relating to the securities
     offered therein, and the offering of such securities at that time shall be
     deemed to be the initial bona fide offering thereof.
 
                                      II-5
<PAGE>   103
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, as amended, the
Company has duly caused this Amendment to the Registration Statement on Form S-1
to be signed on its behalf by the undersigned, thereunto duly authorized in the
City of Seattle, State of Washington, on this 26th day of September, 1997.
    
 
                                          CORIXA CORPORATION
 
                                          By: /s/ STEVEN GILLIS
                                            ------------------------------------
                                            Steven Gillis
                                            President and Chief Executive
                                              Officer
 
                               POWER OF ATTORNEY
 
     Pursuant to the requirements of the Securities Act of 1933, as amended,
this Amendment to the Registration Statement has been signed by the following
persons in the capacities and on the date indicated below:
 
   
<TABLE>
<CAPTION>
                SIGNATURE                                TITLE                     DATE
- ------------------------------------------    ----------------------------  -------------------
<S>                                           <C>                           <C>
 
  /s/ STEVEN GILLIS                           President, Chief Executive     September 26, 1997
  ----------------------------------------      Officer and Director
  (Steven Gillis)                               (Principal Executive
                                                Officer)
 
  /s/ MICHELLE BURRIS*                        Vice President, Finance and    September 26, 1997
  ----------------------------------------      Administration (Principal
  (Michelle Burris)                             Financial and Accounting
                                                Officer)
 
  /s/ MARK MCDADE*                            Executive Vice President,      September 26, 1997
  ----------------------------------------      Chief
  (Mark McDade)                                 Operating Officer and
                                                Director
 
  /s/ JOSEPH S. LACOB*                        Chairman of the Board of       September 26, 1997
  ----------------------------------------      Directors
  (Joseph S. Lacob)
 
  /s/ ARNOLD L. ORONSKY*                      Director                       September 26, 1997
  ----------------------------------------
  (Arnold L. Oronsky)
 
  /s/ ANDREW E. SENYEI*                       Director                       September 26, 1997
  ----------------------------------------
  (Andrew E. Senyei)
 
*By: /s/  STEVEN GILLIS
    -------------------------------------
     Steven Gillis, Attorney-in-Fact
</TABLE>
    
 
                                      II-6
<PAGE>   104
 
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
                                                                                     SEQUENTIALLY
                                                                                       NUMBERED
     NUMBER                                 DESCRIPTION                                 PAGES
    --------     ------------------------------------------------------------------  ------------
    <S>          <C>                                                                 <C>
     1.1*        Form of Underwriting Agreement....................................
     3.1         Amended and Restated Certificate of Incorporation of Registrant...
     3.2         Form of Amended and Restated Certificate of Incorporation of
                 Registrant to be filed with the Delaware Secretary of State.......
     3.3*        Bylaws of Registrant..............................................
     4.1*        Specimen Common Stock Certificate.................................
     5.1*        Opinion of Venture Law Group, A Professional Corporation..........
    10.1*        1994 Amended and Restated Stock Option and Restricted Stock Plan
                 and forms of stock purchase and stock option agreement............
    10.2*        1997 Directors' Stock Option Plan and form of stock option
                 agreement.........................................................
    10.3*        1997 Employee Stock Purchase Plan and form of subscription
                 agreement.........................................................
    10.4*        Corixa Corporation 401(k) Savings & Retirement Plan...............
    10.5*        Form of Indemnification Agreement.................................
    10.6*        Amended and Restated Investors' Rights Agreement dated as of May
                 10, 1996 between Registrant and certain holders of its capital
                 stock.............................................................
    10.7*        Lease Agreement dated October 28, 1994 and amended December 29,
                 1995 between Registrant and Fred Hutchinson Cancer Research
                 Center............................................................
    10.8*        Lease Agreement dated May 31, 1996 between Registrant and Health
                 Science Properties, Inc...........................................
    10.9+        Tuberculosis Collaboration and License Agreement between
                 Registrant and SmithKline Beecham Biologicals S.A. dated October
                 6, 1995...........................................................
    10.10+*      Tuberculosis Collaboration and License Agreement Extension between
                 Registrant and SmithKline Beecham Biologicals S.A. dated February
                 25, 1997..........................................................
    10.11+       Option Agreement between Registrant and SmithKline Beecham
                 Biologicals S.A. dated March 1, 1997..............................
    10.12+*      Special Biologicals and Material Transfer Agreement between
                 Registrant and SmithKline Beecham Biologicals S.A. dated March 1,
                 1997..............................................................
    10.13+       Breast Cancer Collaboration and License Agreement between
                 Registrant and SmithKline Beecham Biologicals S.A. dated March 1,
                 1997..............................................................
    10.14+       Prostate Cancer Collaboration and License Agreement between
                 Registrant and SmithKline Beecham Biologicals S.A. dated March 1,
                 1997..............................................................
    10.15+       Research Collaboration and License Agreement between Registrant
                 and CellPro, Incorporated dated November 1, 1995..................
    10.16+*      First Amendment to Research Collaboration and License Agreement
                 between Registrant and CellPro, Incorporated dated January 1,
                 1997..............................................................
    10.17+*      Research Agreement between Registrant and ZymoGenetics, Inc. dated
                 September 30, 1996................................................
    10.18+       Licensing Agreement between Registrant and Dana-Farber Cancer
                 Institute, Inc. dated January 1, 1995.............................
    10.19+       License, Development and Supply Agreement between Registrant and
                 Abbott Laboratories dated July 24, 1997...........................
    10.20+       Option and License Agreement between Registrant and Pasteur
                 Merieux Connaught dated December 23, 1996.........................
    10.21*       Amendment to Option and License Agreement between Registrant and
                 Pasteur Merieux Connaught dated March 28, 1997....................
</TABLE>
    
<PAGE>   105
 
   
<TABLE>
<CAPTION>
                                                                                     SEQUENTIALLY
                                                                                       NUMBERED
     NUMBER                                 DESCRIPTION                                 PAGES
    --------     ------------------------------------------------------------------  ------------
    <S>          <C>                                                                 <C>
    10.22+       Amended and Restated License and Research Collaboration Agreement
                 dated December 23, 1996 between Registrant and GenQuest, Inc. ....
    10.23+*      Amendment No. 1 to the Amended and Restated License and Research
                 Collaboration Agreement dated January 1, 1997 by and between
                 Registrant and GenQuest, Inc. ....................................
    10.24        Form of Amended and Restated Call Option Agreement dated December
                 23, 1996 by and among Registrant, GenQuest, Inc. and investors of
                 GenQuest listed on Exhibit A thereto..............................
    10.25+       Amended and Restated Administrative Services and Management
                 Agreement dated December 23, 1996 by and between Registrant and
                 GenQuest, Inc. ...................................................
    10.26+       Amended and Restated Research Services and Intellectual Property
                 Agreement effective as of January 1, 1997 by and between
                 Registrant and the Infectious Disease Research Institute..........
    10.27+       License Agreement dated November 20, 1995 by and between
                 Registrant and Health Research, Inc. .............................
    10.28*       Amendment No. 1 to License Agreement dated January 1, 1997 by and
                 between Registrant and Health Research, Inc. .....................
    10.29+       License Agreement dated May 22, 1996 by and among Registrant,
                 Southern Research Institute and University of Alabama at
                 Birmingham Research Foundation....................................
    10.30+*      Amendment No. 1 to License Agreement dated April 30, 1997 by and
                 among Registrant, Southern Research Institute and University of
                 Alabama at Birmingham Research Foundation.........................
    11.1*        Statement of Computation of Pro Forma Net Loss Per Share..........
    23.1         Consent of Ernst & Young LLP, Independent Auditors................
    23.2         Consent of KPMG Peat Marwick LLP, Independent Auditors............
    23.3*        Consent of Venture Law Group, A Professional Corporation (included
                 in Exhibit 5.1)...................................................
    24.1*        Power of Attorney (see page II-6).................................
    27.1*        Financial Data Schedule...........................................
</TABLE>
    
 
- ---------------
* Previously filed.
+ Confidential treatment requested.

<PAGE>   1
                                                                     EXHIBIT 3.1


                AMENDED AND RESTATED CERTIFICATE OF INCORPORATION
                                       OF
                               CORIXA CORPORATION


        The undersigned, Steven Gillis and William W. Ericson, hereby certified
that:

        FIRST: They are the duly elected and acting President and Assistant
Secretary, respectfully, of said corporation.

        SECOND: The original Certificate of Incorporation of WWE Corporation was
filed with the Secretary of State of Delaware on September 8, 1994.

        THIRD: The Certificate of Incorporation of said corporation shall be
amended and restated to read in full as follows:

                                    ARTICLE I

        The name of the corporation (hereinafter called the "Corporation") is
Corixa Corporation.

                                   ARTICLE II

        The address of the registered office of the Corporation in the State of
Delaware is 1013 Centre Road, City of Wilmington, County of New Castle, and the
name of the registered agent of the Corporation in the State of Delaware at such
address is The Corporation Service Company.

                                   ARTICLE III

        The purpose of the Corporation is to engage in any lawful act or
activity for which corporations may be organized under the General Corporation
Law of the State of Delaware.

                                   ARTICLE IV

        A. This Corporation is authorized to issue two classes of stock to be
designated, respectively, "Common Stock" and "Preferred Stock." The total number
of shares which the Corporation is authorized to issue is Sixty-Three Million
One Hundred Thousand (63,100,000) shares, Forty Million (40,000,000) shares of
which shall be Common Stock (the "Common Stock") and Twenty-Three Million One
Hundred Thousand (23,100,000) shares of which shall be Preferred Stock (the
"Preferred Stock"). The Preferred Stock shall have a par value of one-tenth of
one cent ($.001) per share and the Common Stock shall have a par value of
one-tenth of one cent ($.001) per share.

        B. Sixteen Million One Hundred Thousand (16,100,000) of the authorized
shares of Preferred Stock are hereby designated "Series A Preferred Stock" (the
"Series A Preferred"), and One Million Six Hundred Sixty-Six Thousand Six
Hundred Sixty-Seven (1,666,667) of the authorized shares of Preferred Stock are
hereby designated "Series B Preferred Stock" (the "Series B Preferred").



<PAGE>   2
        C. The Preferred Stock authorized by this Amended and Restated
Certificate of Incorporation may be issued from time to time in one or more
series. The rights, preferences, privileges, and restrictions granted to and
imposed on the Series A and Series B Preferred Stock, are as set forth below in
this Article IV(C).

        The Board of Directors is hereby authorized to fix or alter the rights,
preferences, privileges and restrictions granted to or imposed upon additional
series of Preferred Stock, and the number of shares constituting any such series
and the designation thereof, or of any of them. Subject to compliance with
applicable protective voting rights which have been or may be granted to the
Preferred Stock or series thereof in Certificates of Determination or the
Corporation's Certificate of Incorporation ("Protective Provisions"), but
notwithstanding any other rights of the Preferred Stock or any series thereof,
the rights, privileges, preferences and restrictions of any such additional
series may be subordinated to, pari passu with (including, without limitation,
inclusion in provisions with respect to liquidation and acquisition preferences,
redemption and/or approval of matters by vote or written consent), or senior to
any of those of any present or future class or series of Preferred or Common
Stock. Subject to compliance with applicable Protective Provisions, the Board of
Directors is also authorized to increase the number of shares of any series
(other than the Series A) or decrease the number of shares of any series prior
or subsequent to the issue of that series, but not below the number of shares of
such series then outstanding. In case the number of shares of any series shall
be so decreased, the shares constituting such decrease shall resume the status
which they had prior to the adoption of the resolution originally fixing the
number of shares of such series.

        1.     Dividend Rights.

               (a) Holders of Series A and Series B Preferred, in preference to
the holders of any other stock of the Corporation ("Junior Stock"), shall be
entitled to receive, when and as declared by the Board of Directors, cash
dividends at the rate of $0.08 per share per annum on each outstanding share of
Series A Preferred and $0.24 per share per annum on each outstanding share of
Series B Preferred, (each as adjusted for any stock dividends, combinations or
splits with respect to such shares), payable out of funds legally available
therefor. The Original Issue Price of the Series A Preferred shall be One Dollar
($1.00), and the Original Issue Price of the Series B Preferred shall be Three
Dollars ($3.00). Such dividends shall be payable only when, as and if declared
by the Board of Directors and shall be non-cumulative.

               (b) So long as any shares of Series A or Series B Preferred shall
be outstanding, no dividend, whether in cash or property, shall be paid or
declared, nor shall any other distribution be made, on any Junior Stock, nor
shall any shares of any Junior Stock of the Corporation be purchased, redeemed
or otherwise acquired for value by the Corporation (except for acquisitions of
Common Stock by the Corporation pursuant to agreements which permit the
Corporation to repurchase such shares upon termination of services to the
Corporation or in exercise of the Corporation's right of first refusal upon a
proposed transfer) until all dividends (set forth in Section 1(a) above) on the
Series A and Series B Preferred shall have been paid or declared and set apart.
In the event dividends are paid on any share of Common Stock, an additional
dividend shall be paid with respect to all outstanding shares of Series A and
Series B Preferred in an amount equal per share (on an as-if-converted to Common
Stock basis) to the


<PAGE>   3
amount paid or set aside for each share of Common Stock. The provisions of this
Section 1(b) shall not, however, apply to any dividend, exchange or repurchase
of any outstanding securities of the Corporation that is unanimously approved by
the disinterested members of the Corporation's Board of Directors.

        2.     Voting Rights.

               (a) Except as otherwise provided herein or as required by law,
the shares of Series A and Series B Preferred shall be voted equally with the
shares of the Common Stock of the Corporation and not as a separate class, at
any annual or special meeting of stockholders of the Corporation, and may act by
written consent in the same manner as the Common Stock, in either case upon the
following basis: each holder of shares of Preferred Stock shall be entitled to
such number of votes as shall be equal to the whole number of shares of Common
Stock into which such holder's aggregate number of shares of Preferred Stock are
convertible (pursuant to Section 4 hereof) immediately after the close of
business on the record date fixed for such meeting or the effective date of such
written consent.

               (b) The members of the Corporation's Board of Directors shall be
elected in accordance with Section 2(a) hereof.

               (c) For so long as shares of Preferred Stock remain outstanding,
in addition to any other vote or consent required herein or by law, the vote or
written consent of the holders of at least fifty percent (50%) of the
outstanding Preferred Stock, voting together as a single class, shall be
necessary for effecting or validating the following actions:

                       (i) Any amendment, alteration or repeal of any provision
of the Amended and Restated Certificate of Incorporation (the "Restated
Certificate") or the Bylaws of the Corporation (including any filing of a
Certificate of Determination), that affects the voting powers, preferences or
other special rights or privileges, qualifications, limitations or restrictions
of the Preferred Stock;

                       (ii) Any increase or decrease (other than by redemption
or conversion) in the authorized number of shares of Common Stock or Preferred
Stock;

                       (iii) Any authorization or any increase, whether by
reclassification or otherwise, in the authorized amount of any class of shares
or series of equity securities of the Corporation ranking on a parity with or
senior to the Preferred Stock in right of redemption, liquidation preference,
voting or dividends;

                       (iv) Any redemption, repurchase, payment of dividends or
other distributions with respect to Common Stock (except for acquisitions of
Common Stock by the Corporation pursuant to agreements which permit the
Corporation to repurchase such shares upon termination of services to the
Corporation or in exercise of the Corporation's right of first refusal upon a
proposed transfer);

                       (v) Any agreement by the Corporation or its stockholders
regarding an Asset Transfer or Acquisition (each as defined in Section 3(d));


<PAGE>   4
                       (vi) Any action that results in the payment or
declaration of any dividend on any shares of Common Stock or Preferred Stock; or

                       (vii) Any voluntary dissolution or liquidation of the
Corporation.

        3.     Liquidation Rights.

               (a) Upon any liquidation, dissolution or winding up of the
Corporation, whether voluntary or involuntary, before any distribution or
payment shall be made to the holders of the Series B Preferred and to the
holders of any Junior Stock, the holders of Series A Preferred shall be entitled
to be paid out of the assets of the Corporation an amount per share equal to the
sum of (i) One Dollar ($1.00) for each outstanding share of Series A Preferred
(the "Original Series A Issue Price") and (ii) an amount equal to all declared
and unpaid dividends on such share. If, upon the occurrence of a liquidation
event, the assets and funds thus distributed among the holders of the Series A
Preferred shall be insufficient to permit the payment to such holders of the
full preferential amount, then the entire assets of the Corporation legally
available for distribution shall be distributed ratably among the holders of the
Series A Preferred, in proportion to the preferential amount each such holder
would have been entitled to receive.

               (b) After the payment of the full liquidation preference of the
Series A Preferred as set forth in Section 3(a) above, the holders of Series B
Preferred shall be entitled to be paid out of the assets of the Corporation
legally available for distribution, an amount per share equal to the sum of (i)
Three Dollars ($3.00) for each outstanding share of Series B Preferred (the
"Original Series B Issue Price") and (ii) an amount equal to all declared and
unpaid dividends on such share. If, upon the occurrence of a liquidation event,
the assets and funds thus distributed among the holders of the Series B
Preferred shall be insufficient to permit the payment to such holders of the
full preferential amount, then the entire assets of the Corporation legally
available for distribution after the payment of the full liquidation preference
as set forth in Section 3(a) above shall be distributed ratably among the
holders of the Series B Preferred, in proportion to the preferential amount each
such holder would have been entitled to receive.

               (c) After the payment of the full liquidation preference of the
Series A and Series B Preferred as set forth in Sections 3(a) and 3(b) above,
the assets of the Corporation legally available for distribution, if any, shall
be distributed ratably to the holders of the Common Stock, Series A and Series B
Preferred on an as-if-converted to Common Stock basis (as adjusted for stock
splits, recapitalization and the like) until, with respect to the holders of the
Series A Preferred, such holders shall have received an aggregate of Three
Dollars ($3.00) per share (including amounts paid to such holders pursuant to
Section 3(a) above), and with respect to the holders of the Series B Preferred,
such holders shall have received an aggregate of Nine Dollars ($9.00) per share
(including amounts paid to such holders pursuant to Section 3(b) above);
thereafter, the assets of the Corporation legally available for distribution, if
any, shall be distributed ratably to the holders of the Common Stock.

               (d)    The following events shall be considered a liquidation 
under Section 3(a):


<PAGE>   5
                       (i) any consolidation or merger of the Corporation with
or into any other corporation or other entity or person, or any other
corporation reorganization, in which the stockholders of the Corporation
immediately prior to such consolidation, merger or reorganization, own less than
fifty percent (50%) of the Corporation's voting power immediately after such
consolidation, merger or reorganization, or any transaction or series of related
transactions in which in excess of fifty percent (50%) of the Corporation's
voting power is transferred (an "Acquisition"); or

                       (ii) a sale, lease or other disposition of all or
substantially all of the assets of the Corporation (an "Asset Transfer").

        4.     Conversion Rights.

               The holders of the Series A and Series B Preferred shall have the
following rights with respect to the conversion of such Preferred Stock into
shares of Common Stock:

               (a) Optional Conversion. Subject to and in compliance with the
provisions of this Section 4, any shares of Series A and Series B Preferred may,
at the option of the holder, be converted at any time into fully-paid and
nonassessable shares of Common Stock. The number of shares of Common Stock to
which a holder of Series A or Series B Preferred shall be entitled upon
conversion shall be the product obtained by multiplying the "Series A Conversion
Rate" or the "Series B Conversion Rate," as applicable, then in effect
(determined as provided in Section 4(b)) by the number of shares of Series A or
Series B Preferred being converted, respectively.

               (b) Conversion Rate. The conversion rate in effect at any time
for conversion of the Series A Preferred (the "Series A Conversion Rate") shall
be the quotient obtained by dividing the Original Series A Issue Price by the
"Series A Conversion Price," calculated as provided in Section 4(c). The
conversion rate in effect at any time for conversion of the Series B Preferred
(the "Series B Conversion Rate") shall be the quotient obtained by dividing the
Original Series B Issue Price by the "Series B Conversion Price," calculated as
provided in Section 4(c).

               (c) Conversion Price. The initial conversion price per share for
each share of Series A Preferred shall be the Original Series A Issue Price (the
"Series A Conversion Price") and the initial conversion price per share for each
share of Series B Preferred shall be the Original Series B Issue Price (the
"Series B Conversion Price") (collectively, the "Conversion Prices"). Such
initial Conversion Prices shall be adjusted from time to time in accordance with
this Section 4. All references to any Conversion Price herein shall mean such
Conversion Price as so adjusted.

               (d) Mechanics of Conversion. Each holder of Series A and Series B
Preferred who desires to convert such Preferred Stock into shares of Common
Stock pursuant to this Section 4 shall surrender the certificate or certificates
therefor, duly endorsed, at the office of the Corporation or any transfer agent
for such Preferred Stock, and shall give written notice to the Corporation at
such office that such holder elects to convert the same. Such notice shall state
the number of shares of Series A or Series B Preferred being converted.
Thereupon, the Corporation 
<PAGE>   6
shall promptly issue and deliver at such office to such holder a certificate or
certificates for the number of shares of Common Stock to which such holder is
entitled and shall promptly pay in cash or, to the extent sufficient funds are
not then legally available therefor, in Common Stock (at the Common Stock's fair
market value determined by the Board of Directors as of the date of such
conversion), any declared and unpaid dividends on the shares of Preferred Stock
being converted. Such conversion shall be deemed to have been made at the close
of business on the date of such surrender of the certificates representing the
shares of Preferred Stock to be converted, and the person entitled to receive
the shares of Common Stock issuable upon such conversion shall be treated for
all purposes as the record holder of such shares of Common Stock on such date.

               (e) Adjustment for Stock Splits and Combinations. If the
Corporation shall at any time or from time to time after the date that the first
share of Series B Preferred is issued (the "Original Series B Issue Date")
effect a subdivision of the outstanding Common Stock, the respective Conversion
Prices for the Series A and Series B Preferred in effect immediately before that
subdivision shall be proportionately decreased. Conversely, if the Corporation
shall at any time or from time to time after the Original Series B Issue Date
combine the outstanding shares of Common Stock into a smaller number of shares,
the respective Conversion Prices for the Series A and Series B Preferred in
effect immediately before the combination shall be proportionately increased.
Any adjustment under this Section 4(e) shall become effective at the close of
business on the date the subdivision or combination becomes effective.

               (f) Adjustment for Common Stock Dividends and Distributions. If
the Corporation at any time or from time to time after the Original Series B
Issue Date makes, or fixes a record date for the determination of holders of
Common Stock entitled to receive, a dividend or other distribution payable in
additional shares of Common Stock, in each such event the respective Conversion
Prices for the Series A and Series B Preferred that are then in effect shall be
decreased as of the time of such issuance or, in the event such record date is
fixed, as of the close of business on such record date, by multiplying the
respective Conversion Prices for the Series A or Series B Preferred, as
applicable, then in effect by a fraction (1) the numerator of which is the total
number of shares of Common Stock issued and outstanding immediately prior to the
time of such issuance or the close of business on such record date, and (2) the
denominator of which is the total number of shares of Common Stock issued and
outstanding immediately prior to the time of such issuance or the close of
business on such record date plus the number of shares of Common Stock issuable
in payment of such dividend or distribution; provided, however, that if such
record date is fixed and such dividend is not fully paid or if such distribution
is not fully made on the date fixed therefor, the respective Conversion Prices
for the Series A and Series B Preferred shall be recalculated accordingly as of
the close of business on such record date and thereafter the respective
Conversion Prices for the Series A and Series B Preferred shall be adjusted
pursuant to this Section 4(f) to reflect the actual payment of such dividend or
distribution.

               (g) Adjustments for Other Dividends and Distributions. If the
Corporation at any time or from time to time after the Original Series B Issue
Date makes, or fixes a record date for the determination of holders of Common
Stock entitled to receive, a dividend or other distribution payable in
securities of the Corporation other than shares of Common Stock, in each 
<PAGE>   7
such event provision shall be made so that the holders of the Series A and
Series B Preferred shall receive upon conversion thereof, in addition to the
number of shares of Common Stock receivable thereupon, the amount of other
securities of the Corporation which they would have received had their Series A
or Series B Preferred, as applicable, been converted into Common Stock on the
date of such event and had they thereafter, during the period from the date of
such event to and including the conversion date, retained such securities
receivable by them as aforesaid during such period, subject to all other
adjustments called for during such period under this Section 4 with respect to
the rights of the holders of the Preferred Stock or with respect to such other
securities by their terms.

               (h) Adjustment for Reclassification, Exchange and Substitution.
If at any time or from time to time after the Original Series B Issue Date, the
Common Stock issuable upon the conversion of the Series A or Series B Preferred,
as applicable, is changed into the same or a different number of shares of any
class or classes of stock, whether by recapitalization, reclassification or
otherwise (other than an Acquisition or Asset Transfer as defined in Section
3(d) or a subdivision or combination of shares or stock dividend or a
reorganization, merger, consolidation or sale of assets provided for elsewhere
in this Section 4), in any such event each holder of Series A or Series B
Preferred shall have the right thereafter to convert such stock into the kind
and amount of stock and other securities and property receivable upon such
recapitalization, reclassification or other change by holders of the maximum
number of shares of Common Stock into which such shares of Series A or Series B
Preferred, as applicable, could have been converted immediately prior to such
recapitalization, reclassification or change, all subject to further adjustment
as provided herein or with respect to such other securities or property by the
terms thereof.

               (i) Reorganizations, Mergers, Consolidations or Sales of Assets.
If at any time or from time to time after the Original Series B Issue Date,
there is a capital reorganization of the Common Stock (other than an Acquisition
or Asset Transfer as defined in Section 3(d) or a recapitalization, subdivision,
combination, reclassification, exchange or substitution of shares provided for
elsewhere in this Section 4) as a part of such capital reorganization, provision
shall be made so that the holders of the Series A and Series B Preferred shall
thereafter be entitled to receive upon conversion of the Series A or Series B
Preferred, as applicable, the number of shares of stock or other securities or
property of the Corporation to which a holder of the number of shares of Common
Stock deliverable upon conversion would have been entitled on such capital
reorganization, subject to adjustment in respect of such stock or securities by
the terms thereof. In any such case, appropriate adjustment shall be made in the
application of the provisions of this Section 4 with respect to the rights of
the holders of Series A and Series B Preferred after the capital reorganization
to the end that the provisions of this Section 4 (including adjustment of the
respective Conversion Price of the Series A and Series B Preferred

<PAGE>   8
then in effect and the number of shares issuable upon conversion of the Series A
or Series B Preferred, as applicable) shall be applicable after that event and
be as nearly equivalent as practicable.

               (j) Conversion Price Adjustments of Preferred Stock for Certain
Dilutive Issuances, Splits and Combinations. The Series A Conversion Price and
the Series B Conversion Price shall be subject to adjustment from time to time
as follows:

                       (1) If at any time or from time to time after the
Original Series B Issue Date, the Corporation issues or sells, or is deemed by
the express provisions of this subsection 4(j) to have issued or sold,
Additional Shares of Common Stock (as hereinafter defined), other than as a
dividend or other distribution on any class of stock as provided in Section 4(f)
above, and other than a subdivision or combination of shares of Common Stock as
provided in Section 4(e) above, for an Effective Price (as hereinafter defined)
less than $.87 per share with respect to the Series A Preferred and/or for an
Effective Price less than $3.00 per share with respect to the Series B Preferred
(a "Dilutive Issuance" with respect to the Series A Preferred and/or the Series
B Preferred, as applicable), then and in each such case the then existing
respective Conversion Price for the Series A and/or Series B Preferred, as
applicable, shall be reduced, as of the opening of business on the date of such
issuance or sale, to a price determined by multiplying such then effective
Conversion Price by a fraction (i) the numerator of which shall be (A) the
number of shares of Common Stock deemed outstanding (as defined below)
immediately prior to such issuance or sale, plus (B) the number of shares of
Common Stock which the aggregate consideration received (as defined in
subsection 4(j)(2)) by the Corporation for the total number of Additional Shares
of Common Stock so issued would purchase at such Series A and/or Series B
Conversion Price, as applicable, and (ii) the denominator of which shall be the
number of shares of Common Stock deemed outstanding (as defined below)
immediately prior to such issuance or sale plus the total number of Additional
Shares of Common Stock so issued. For the purposes of the preceding sentence,
the number of shares of Common Stock deemed to be outstanding as of a given date
shall be the sum of (A) the number of shares of Common Stock actually
outstanding and (B) the number of shares of Common Stock into which the then
outstanding shares of Series A and Series B Preferred could be converted if
fully converted on the day immediately preceding the given date.

                       (2) For the purpose of making any adjustment required
under this Section 4(j), the consideration received by the Corporation for any
issue or sale of securities shall (A) to the extent it consists of cash, be
computed at the net amount of cash received by the Corporation after deduction
of any underwriting or similar commissions, compensation or concessions paid or
allowed by the Corporation in connection with such issue or sale but without
deduction of any expenses payable by the Corporation, (B) to the extent it
consists of property other than cash, be computed at the fair value of that
property as determined in good faith by the Board of Directors, and (C) if
Additional Shares of Common Stock, Convertible Securities (as hereinafter
defined) or rights or options to purchase either Additional Shares of Common
Stock or Convertible Securities are issued or sold together with other stock or
securities or other assets of the Corporation for a consideration which covers
both, be computed as the portion of the

<PAGE>   9
consideration so received that may be reasonably determined in good faith by the
Board of Directors to be allocable to such Additional Shares of Common Stock,
Convertible Securities or rights or options.

                       (3) For the purpose of the adjustment required under this
Section 4(j), if the Corporation issues or sells any rights or options for the
purpose of, or stock or other securities convertible into, Additional Shares of
Common Stock (such convertible stock or securities being herein referred to as
"Convertible Securities") and if the Effective Price of such Additional Shares
of Common Stock is less than the Series A or Series B Conversion Price, as
applicable, in each case the Corporation shall be deemed to have issued at the
time of the issuance of such rights or options or Convertible Securities the
maximum number of Additional Shares of Common Stock issuable upon exercise or
conversion thereof and to have received as consideration for issuance of such
shares an amount equal to the total amount of consideration, if any, received by
the Corporation for the issuance of such rights or options of Convertible
Securities, plus, in the case of such rights or options, the minimum amounts of
consideration, if any, payable to the Corporation upon the exercise of such
rights or options, plus, in the case of the Convertible Securities, the minimum
amounts of consideration, if any, payable to the Corporation (other than by
cancellation of liabilities or obligations evidenced by such Convertible
Securities) upon the conversion thereof; provided that, if in the case of the
Convertible Securities, the minimum amounts of such consideration cannot be
ascertained, but are a function of antidilution or similar protective clauses,
the Corporation shall be deemed to have received the minimum amounts of
consideration without reference to such clauses; provided further that if the
minimum amount of consideration payable to the Corporation upon the exercise or
conversion of rights, options or Convertible Securities is reduced over time or
on the occurrence or non-occurrence of specified events other than by reason or
antidilution adjustments, the Effective Price shall be recalculated using the
figure to which some minimum amount of consideration is reduced; provided
further that if the minimum amount of consideration payable to the Corporation
upon the exercise or conversion of such rights, options or Convertible
Securities is subsequently increased, the Effective Price shall be again
recalculated using the increased minimum amount of consideration payable to the
Corporation upon the exercise or conversion of such rights, options or
Convertible Securities. No further adjustment of the Series A and/or Series B
Conversion Price, as applicable, as adjusted upon the issuance of such rights,
options or Convertible Securities shall be made as a result of the actual
issuance of Additional Shares of Common Stock on the exercise of any such rights
or options or the conversion of any Convertible Securities. If any such rights
or options or the conversion privilege represented by any such Convertible
Securities shall expire without having been exercised, the Series A and/or
Series B Conversion Price, as applicable, as adjusted upon the issuance of such
rights, options or Convertible Securities shall be readjusted to the Series A
and/or Series B Conversion Price, as applicable, which would have been in effect
had an adjustment been made on the basis that the only Additional Shares of
Common Stock, if any, actually issued or sold on the exercise of such rights or
options or rights of conversion of such Convertible Securities, and such
Additional Shares of Common Stock, if any, were issued or sold for the
consideration actually received by the Corporation upon such existence, plus the
consideration, if any, actually received by the Corporation for the granting of
all such rights or options, whether or not exercised, plus the consideration
received for issuing or selling the Convertible Securities actually converted,
plus the


<PAGE>   10
consideration, if any, actually received by the Corporation (other than by
cancellation of liabilities or obligations evidenced by such Convertible
Securities) on the conversion of such Convertible Securities, provided that such
readjustment shall not apply to prior conversions of Series A and/or Series B
Preferred, as applicable.

                       (4) "Additional Shares of Common Stock" shall mean all
shares of Common Stock issued by the Corporation or deemed to be issued pursuant
to this Section 4(j), whether or not subsequently reacquired or retired by the
Corporation other than (1) shares of Common Stock issued upon conversion of the
Series A or Series B Preferred, (2) shares of Common Stock (and/or options,
warrants or other Common Stock purchase rights, and the Common Stock issued
pursuant to such options, warrants and other rights) issued or to be issued to
employees, officers or directors of, or consultants or advisors to the
Corporation or any subsidiary pursuant to stock purchase or stock option plans
or other arrangements that are approved by the Board, (3) stock, warrants or
other securities or rights issued in connection with equipment leasing or bank
financing transactions, provided such issuances are for other than primarily
equity financing purposes, (4) stock, warrants or other securities or rights
issued to academic or research institutions in connection with (i) the license
of technology from such institutions or (ii) research and development services
provided by such institutions, (5) stock, warrants or other securities or rights
issued in connection with a transaction with a corporation or other third party
which is not primarily in the business of making equity investments that also
involves other strategic elements such as, but not by way of limitation, a joint
marketing agreement, a license agreement or a technology development agreement,
(6) shares of Common Stock issued pursuant to the exercise of options, warrants
or convertible securities outstanding as of the Original Series B Issue Date,
and (7) Common Stock issued pursuant to a transaction described in subsections
4(g), (h) and (i) hereof. The "Effective Price" of Additional Shares of Common
Stock shall mean the quotient determined by dividing the total number of
Additional Shares of Common Stock issued or sold, or deemed to have been issued
or sold by the Corporation under this subsection 4(j), into the aggregate
consideration received, or deemed to have been received, by the Corporation for
such issue under this subsection 4(j), for such Additional Shares of Common
Stock.

               (k) Accountants' Certificate of Adjustment. In each case of an
adjustment or readjustment of the respective Conversion Prices of the Series A
or Series B Preferred for the number of shares of Common Stock or other
securities issuable upon conversion of the Series A or Series B Preferred,
respectively, if such Preferred Stock is then convertible pursuant to this
Section 4, the Corporation, at its expense, shall compute such adjustment or
readjustment in accordance with the provisions hereof and prepare a certificate
showing such adjustment or readjustment, and shall mail such certificate, by
first class mail, postage prepaid, to each registered holder of such Preferred
Stock at the holder's address as shown in the Corporation's books. The
certificate shall set forth such adjustment or readjustment, showing in detail
the facts upon which such adjustment is based, including a statement of (i) the
consideration received or deemed to be received by the Corporation for any
Additional Shares of Common Stock issued or sold or deemed to have been issued
or sold, (ii) the respective Conversion Prices of the Series A

<PAGE>   11
or Series B Preferred, as applicable, at the time in effect, (iii) the number of
Additional Shares of Common Stock, and (iv) the type and amount, if any, of
other property which at the time would be received upon conversion of such
Preferred Stock.

               (l) Notices of Record Dates. Upon (i) any taking by the
Corporation of a record of the holders of any class of securities for the
purpose of determining the holders thereof who are entitled to receive any
dividend or other distribution, or (ii) any Acquisition (as defined in Section
3(d), respectively, or other capital reorganization of the Corporation, any
reclassification or recapitalization of the capital stock of the Corporation,
any merger or consolidation of the Corporation with or into any other
corporation, or any Asset Transfer (as defined in Section 3(d)), or any
voluntary or involuntary dissolution, liquidation or winding up of the
Corporation, the Corporation shall mail to each holder of Preferred Stock at
least twenty (20) days prior to the record date specified therein a notice
specifying (1) the date on which any such record is to be taken for the purpose
of such dividend or distribution and a description of such dividend or
distribution, (2) the date on which any such Acquisition, reorganization,
reclassification, transfer, consolidation, merger, Asset Transfer, dissolution,
liquidation or winding up is expected to become effective, and (3) the date, if
any, that is to be fixed as to when the holders of record of Common Stock (or
other securities) shall be entitled to exchange shares of Common Stock (or other
securities) for securities or other property deliverable upon such Acquisition,
reorganization, reclassification, transfer, consolidation, merger, Asset
Transfer, dissolution, liquidation or winding up.

               (m)    Automatic Conversion.

                       (1) Each share of Series A and Series B Preferred shall
automatically be converted into shares of Common Stock, based on the
then-effective respective Series A and Series B Conversion Prices, at any time
upon the affirmative vote of the holders of at least a majority of the
outstanding shares of Preferred Stock, or immediately upon the closing of a
firmly underwritten public offering pursuant to an effective registration
statement under the Securities Act of 1933, as amended, covering the offer and
sale of Common Stock for the account of the Corporation in which (i) the per
share price is at least Seven Dollars ($7.00) (as adjusted for stock splits,
recapitalization and the like), and (ii) the gross cash proceeds to the
Corporation (before underwriting discounts, commissions and fees) are at least
Ten Million Dollars ($10,000,000). Upon such automatic conversion, any
accumulated and unpaid dividends shall be paid in accordance with the provision
of Section 4(d).

                       (2) Upon the occurrence of the event specified in
paragraph (1) above, the outstanding shares of Series A and Series B Preferred
shall be converted automatically without any further action by the holders of
such shares and whether or not the certificate representing such shares are
surrendered to the Corporation or its transfer agents; provided, however, that
the Corporation shall not be obligated to issue certificates evidencing the
shares of Common Stock issuable upon such conversion unless the certificate
evidencing such shares of Preferred Stock are either delivered to the
Corporation or its transfer agent as provided below, or the holder notifies the
Corporation or its transfer agent that such certificates have been lost, stolen
or destroyed and executes an agreement satisfactory to the Corporation to
indemnify the Corporation from any loss incurred by it in connection with such
certificates. Upon the  


<PAGE>   12
occurrence of such automatic conversion of the Series A and Series B Preferred,
as applicable, the holders of such Preferred Stock shall surrender the
certificates representing such shares at the office of the Corporation or any
transfer agent for the Preferred Stock. Thereupon, there shall be issued and
delivered to such holder promptly at such office and in its name as shown on
such surrendered certificate or certificates, a certificate or certificates for
the number of shares of Common Stock into which the shares of Preferred Stock
surrendered were convertible on the date on which such automatic conversion
occurred, and the Corporation shall promptly pay in cash or, at the option of
the Corporation, Common Stock (at the Common Stock's fair market value
determined by the Board as of the date of such conversion), or, at the option of
the Corporation, both, all declared and unpaid dividends on the shares of Series
A and Series B Preferred being converted, to and including the date of such
conversion.

               (n) Fractional Shares. No fractional shares of Common Stock shall
be issued upon conversion of the Series A or Series B Preferred. All shares of
Common Stock (including fractions thereof) issuable upon conversion of more than
one share of Series A or Series B Preferred by a holder thereof shall be
aggregated for purposes of determining whether the conversion would result in
the issuance of any fractional share. If, after the aforementioned aggregation,
the conversion would result in the issuance of any fractional share, the
Corporation shall, in lieu of issuing any fractional share, pay cash equal to
the product of such fraction multiplied by the Common Stock's fair market value
(as determined by the Board) on the date of conversion.

               (o) Reservation of Stock Issuable Upon Conversion. The
Corporation shall at all times reserve and keep available out of its authorized
but unissued shares of Common Stock, solely for the purpose of effecting the
conversion of the shares of Series A and Series B Preferred, such number of its
shares of Common Stock as shall from time to time be sufficient to effect the
conversion of all outstanding shares of Series A and Series B Preferred. If at
any time the number of authorized but unissued shares of Common Stock shall not
be sufficient to effect the conversion of all then outstanding shares of
Preferred Stock, the Corporation will take such corporate action as may, in the
opinion of its counsel, be necessary to increase its authorized but unissued
shares of Common Stock to such number of shares as shall be sufficient for such
purpose.

               (p) Notices. Any notice required by the provisions of this
Section 4 shall be in writing and shall be deemed effectively given: (i) upon
personal delivery to the party to be notified, (ii) when sent by confirmed telex
or facsimile if sent during normal business hours of the recipient; if not, then
on the next business day, (iii) five (5) days after having been sent by
registered or certified mail, return receipt requested, postage prepaid, or (iv)
one (1) day after deposit with a nationally recognized overnight courier,
specifying next day delivery, with written verification of receipt. All notices
shall be addressed to each holder of record at the address of such holder
appearing on the books of the Corporation.



<PAGE>   13
               (q) Payment of Taxes. The Corporation will pay all taxes (other
than taxes based upon income) and other governmental charges that may be imposed
with respect to the issue or delivery of shares of Common Stock upon conversion
of shares of Series A and Series B Preferred, excluding any tax or other charge
imposed in connection with any transfer involved in the issue and delivery of
shares of Common Stock in a name other than that in which the shares of the
Preferred Stock so converted were registered.

               (r) No Dilution or Impairment. The Corporation shall not amend
its Restated Certificate or participate in any reorganization, transfer of
assets, consolidation, merger, dissolution, issue or sale of securities or any
other voluntary action, for the purpose of avoiding or seeking to avoid the
observance or performance of any of the terms to be observed or performed
hereunder by the Corporation, but shall at all times in good faith assist in
carrying out all such action as may be reasonably necessary or appropriate in
order to protect the conversion rights of the holders of the Series A and Series
B Preferred against dilution or other impairment.

        5. No Reissuance. No share or shares of Series A or Series B Preferred
acquired by the Corporation by reason of redemption, purchase, conversion or
otherwise shall be reissued.

        D. The rights, preferences, privileges, restrictions and other matters
relating to the Common Stock are as follows:

        1. Dividend Rights. Subject to the prior rights of holders of all
classes of stock at the time outstanding having prior rights as to dividends,
the holders of the Common Stock shall be entitled to receive, when and as
declared by the Board of Directors, out of any assets of the Corporation legally
available therefor, such dividends as may be declared from time to time by the
Board of Directors.

        2. Liquidation Rights. Upon the liquidation, dissolution or winding up
of the Corporation, the assets of the Corporation shall be distributed as
provided in Section 3 of Article IV hereof.

        3. Redemption. The Common Stock is not redeemable; provided, however,
that this restriction shall not apply to the repurchase of shares of Common
Stock from employees, officers, directors, consultants or other persons
performing services for the Corporation or any subsidiary pursuant to agreements
under which the Corporation has the option to repurchase such shares at cost or
at cost upon the occurrence of certain events, such as the termination of
employment.

        4. Voting Rights. The holder of each share of Common Stock shall have
the right to one vote, and shall be entitled to notice of any stockholders'
meetings in accordance with the Bylaws of the Corporation, and shall be entitled
to vote upon such matters and in such manner as may be provided by law.



<PAGE>   14
                                    ARTICLE V

        A director of the Corporation shall, to the fullest extent permitted by
the Delaware General Corporation Law as it now exists or as it may hereafter be
amended, not be liable to the Corporation or its stockholders for monetary
damages for breach of fiduciary duty as a director. Neither any amendment or
repeal of this Article V, nor the adoption of any provision of this Restated
Certificate inconsistent with this Article V, shall eliminate or reduce the
effect of this Article V in respect of any matter occurring, or any cause of
action, suit or claim that, but for this Article V, would accrue or arise, prior
to such amendment, repeal or adoption of any inconsistent provision.

                                   ARTICLE VI

        To the fullest extent permitted by applicable law, the Corporation is
also authorized to provide indemnification of (and advancement of expenses to)
such agents (and any other persons to which Delaware law permits the Corporation
to provide indemnification) through Bylaw provisions, agreements with such
agents or other persons, vote of stockholders or disinterested directors or
otherwise, in excess of the indemnification and advancement otherwise permitted
by Section 145 of the General Corporation Law of the State of Delaware, subject
only to limits created by applicable Delaware law (statutory or non-statutory),
with respect to actions for breach of duty to the Corporation, its stockholders
and others.

        Any repeal or modifications of any of the foregoing provisions of this
Article VI shall not adversely affect any right or protection of a director,
officer, agent or other person existing at the time of, or increase the
liability of any director of the Corporation with respect to any acts or
omissions of such director, officer or agent occurring prior to such repeal or
modification.

                                   ARTICLE VII

        For the management of the business and for the conduct of the affairs of
the Corporation, and in further definition, limitation and regulation of the
powers of the Corporation, of its directors and of its stockholders or any class
thereof, as the case may be, it is further provided that:

        1. The management of the business and the conduct of the affairs of the
Corporation shall be vested in its Board of Directors. The number of directors
which shall constitute the whole Board of Directors shall be fixed by the Board
of Directors in the manner provided in the Bylaws.

        2. The Board of Directors may from time to time make, amend, supplement
or repeal the Bylaws; provided, however, that the stockholders may change or
repeal any Bylaw adopted by the Board of Directors by the affirmative vote of
the holders of a majority of the voting power

<PAGE>   15
of all of the then outstanding shares of the capital stock of the Corporation;
and, provided further, that no amendment or supplement to the Bylaws adopted by
the Board of Directors shall vary or conflict with any amendment or supplement
thus adopted by the stockholders.

        3. The directors of the Corporation need not be elected by written
ballot unless the Bylaws so provide.

                                  ARTICLE VIII

        The Corporation reserves the right to amend, alter, change or repeal any
provision contained in this Restated Certificate, in the manner now or hereafter
prescribed by statute, and all rights conferred upon the stockholders herein are
granted subject to this right.



<PAGE>   16
        FOURTH: The foregoing Amended and Restated Certificate of Incorporation
has been duly adopted in accordance with the applicable provisions of Sections
228, 245 and 242 of the General Corporation Law of the State of Delaware by the
directors and stockholders of the Corporation.

        IN WITNESS WHEREOF, Corixa Corporation has caused this Certificate to be
signed by the President and the Assistant Secretary this 10th day of May, 1996.



                                                 By:  /s/ Steven Gillis
                                                    ----------------------------
                                                      Steven Gillis
                                                      President

ATTEST:



By:     /s/ William W. Ericson
   ---------------------------------
        William W. Ericson
        Assistant Secretary




<PAGE>   1
                                                                     EXHIBIT 3.2


                              AMENDED AND RESTATED
                          CERTIFICATE OF INCORPORATION
                                       OF
                               CORIXA CORPORATION
                             A Delaware corporation
                        (Pursuant to Sections 242 and 245
                    of the Delaware General Corporation Law)

      CORIXA CORPORATION, a corporation organized and existing under and by
virtue of the General Corporation Law of the State of Delaware, hereby certifies
as follows:


      FIRST:  That the name of the corporation is Corixa Corporation and that
the corporation was originally incorporated as WWE Corporation on September
8, 1994 pursuant to the General Corporation Law.

      SECOND:  An Amended and Restated Certificate of Incorporation of this
corporation was originally filed with the Secretary of State of Delaware on
September 23, 1994.

      THIRD:  An Amended and Restated Certificate of Incorporation of this
corporation was originally filed with the Secretary of State of Delaware on
December 2, 1994.

      FOURTH:  An Amended and Restated Certificate of Incorporation of this
corporation was originally filed with the Secretary of State of Delaware on
May 10, 1996.

      FIFTH:  The Certificate of Incorporation of said corporation shall be
amended and restated to read in full as follows:

                                   "ARTICLE I

      The name of the corporation (hereinafter called the "Corporation") is
Corixa Corporation.

                                   ARTICLE II

      The address of the registered office of the Corporation in the State of
Delaware is 1013 Centre Road, City of Wilmington, County of New Castle, and the
name of the registered agent of the Corporation in the State of Delaware at such
address is Corporation Service Company.

                                   ARTICLE III

      The purpose of the Corporation is to engage in any lawful act or activity
for which corporations may be organized under the General Corporation Law of the
State of Delaware.

                                   ARTICLE IV

      A. This Corporation is authorized to issue two classes of stock to be
designated, respectively, "Common Stock" and "Preferred Stock." The total number
of shares which the 


<PAGE>   2

Corporation is authorized to issue is Sixty-Three Million One Hundred Thousand
(63,100,000) shares, Forty Million (40,000,000) shares of which shall be Common
Stock (the "Common Stock") and Twenty-Three Million One Hundred Thousand
(23,100,000) shares of which shall be Preferred Stock (the "Preferred Stock").
The Preferred Stock shall have a par value of one-tenth of one cent ($.001) per
share and the Common Stock shall have a par value of one-tenth of one cent
($.001) per share.

      Immediately upon the filing of this Amended and Restated Certificate of
Incorporation, each 3.3 outstanding shares of the Corporation's Common Stock,
$0.001 par value per share, will be exchanged and combined, automatically,
without further action, into 1 share of Common Stock, $0.001 par value per
share.

      B. Sixteen Million One Hundred Thousand (16,100,000) of the authorized
shares of Preferred Stock are hereby designated "Series A Preferred Stock" (the
"Series A Preferred"), and One Million Six Hundred Sixty-Six Thousand Six
Hundred Sixty-Seven (1,666,667) of the authorized shares of Preferred Stock are
hereby designated "Series B Preferred Stock" (the "Series B Preferred").

      C. The Preferred Stock authorized by this Amended and Restated Certificate
of Incorporation may be issued from time to time in one or more series. The
rights, preferences, privileges, and restrictions granted to and imposed on the
Series A and Series B Preferred Stock, are as set forth below in this Article
IV(C).

      The Board of Directors is hereby authorized to fix or alter the rights,
preferences, privileges and restrictions granted to or imposed upon additional
series of Preferred Stock, and the number of shares constituting any such series
and the designation thereof, or of any of them. Subject to compliance with
applicable protective voting rights which have been or may be granted to the
Preferred Stock or series thereof in Certificates of Determination or the
Corporation's Certificate of Incorporation ("Protective Provisions"), but
notwithstanding any other rights of the Preferred Stock or any series thereof,
the rights, privileges, preferences and restrictions of any such additional
series may be subordinated to, pari passu with (including, without limitation,
inclusion in provisions with respect to liquidation and acquisition preferences,
redemption and/or approval of matters by vote or written consent), or senior to
any of those of any present or future class or series of Preferred or Common
Stock. Subject to compliance with applicable Protective Provisions, the Board of
Directors is also authorized to increase the number of shares of any series
(other than the Series A) or decrease the number of shares of any series prior
or subsequent to the issue of that series, but not below the number of shares of
such series then outstanding. In case the number of shares of any series shall
be so decreased, the shares constituting such decrease shall resume the status
which they had prior to the adoption of the resolution originally fixing the
number of shares of such series.

      1.    Dividend Rights.

            (a) Holders of Series A and Series B Preferred, in preference to the
holders of any other stock of the Corporation ("Junior Stock"), shall be
entitled to receive, when and as declared by the Board of Directors, cash
dividends at the rate of $0.08 per share per annum on 



<PAGE>   3

each outstanding share of Series A Preferred and $0.24 per share per annum on
each outstanding share of Series B Preferred, (each as adjusted for any stock
dividends, combinations or splits with respect to such shares), payable out of
funds legally available therefor. The Original Issue Price of the Series A
Preferred shall be One Dollar ($1.00), and the Original Issue Price of the
Series B Preferred shall be Three Dollars ($3.00). Such dividends shall be
payable only when, as and if declared by the Board of Directors and shall be
non-cumulative.

            (b) So long as any shares of Series A or Series B Preferred shall be
outstanding, no dividend, whether in cash or property, shall be paid or
declared, nor shall any other distribution be made, on any Junior Stock, nor
shall any shares of any Junior Stock of the Corporation be purchased, redeemed
or otherwise acquired for value by the Corporation (except for acquisitions of
Common Stock by the Corporation pursuant to agreements which permit the
Corporation to repurchase such shares upon termination of services to the
Corporation or in exercise of the Corporation's right of first refusal upon a
proposed transfer) until all dividends (set forth in Section 1(a) above) on the
Series A and Series B Preferred shall have been paid or declared and set apart.
In the event dividends are paid on any share of Common Stock, an additional
dividend shall be paid with respect to all outstanding shares of Series A and
Series B Preferred in an amount equal per share (on an as-if-converted to Common
Stock basis) to the amount paid or set aside for each share of Common Stock. The
provisions of this Section 1(b) shall not, however, apply to any dividend,
exchange or repurchase of any outstanding securities of the Corporation that is
unanimously approved by the disinterested members of the Corporation's Board of
Directors.

      2.    Voting Rights.

            (a) Except as otherwise provided herein or as required by law, the
shares of Series A and Series B Preferred shall be voted equally with the shares
of the Common Stock of the Corporation and not as a separate class, at any
annual or special meeting of stockholders of the Corporation, and may act by
written consent in the same manner as the Common Stock, in either case upon the
following basis: each holder of shares of Preferred Stock shall be entitled to
such number of votes as shall be equal to the whole number of shares of Common
Stock into which such holder's aggregate number of shares of Preferred Stock are
convertible (pursuant to Section 4 hereof) immediately after the close of
business on the record date fixed for such meeting or the effective date of such
written consent.

            (b) The members of the Corporation's Board of Directors shall be
elected in accordance with Section 2(a) hereof.

            (c) For so long as shares of Preferred Stock remain outstanding, in
addition to any other vote or consent required herein or by law, the vote or
written consent of the holders of at least fifty percent (50%) of the
outstanding Preferred Stock, voting together as a single class, shall be
necessary for effecting or validating the following actions:

                  (i) Any amendment, alteration or repeal of any provision of
the Amended and Restated Certificate of Incorporation (the "Restated
Certificate") or the Bylaws of the Corporation (including any filing of a
Certificate of Determination), that affects the voting 


<PAGE>   4

powers, preferences or other special rights or privileges, qualifications,
limitations or restrictions of the Preferred Stock;

                 (ii) Any increase or decrease (other than by redemption or
conversion) in the authorized number of shares of Common Stock or Preferred
Stock;

                 (iii) Any authorization or any increase, whether by
reclassification or otherwise, in the authorized amount of any class of shares
or series of equity securities of the Corporation ranking on a parity with or
senior to the Preferred Stock in right of redemption, liquidation preference,
voting or dividends;

                 (iv) Any redemption, repurchase, payment of dividends or other
distributions with respect to Common Stock (except for acquisitions of Common
Stock by the Corporation pursuant to agreements which permit the Corporation to
repurchase such shares upon termination of services to the Corporation or in
exercise of the Corporation's right of first refusal upon a proposed transfer);

                 (v) Any agreement by the Corporation or its stockholders
regarding an Asset Transfer or Acquisition (each as defined in Section 3(d));

                 (vi) Any action that results in the payment or declaration of
any dividend on any shares of Common Stock or Preferred Stock; or

                 (vii) Any voluntary dissolution or liquidation of the
Corporation.

      3.    Liquidation Rights.

            (a) Upon any liquidation, dissolution or winding up of the
Corporation, whether voluntary or involuntary, before any distribution or
payment shall be made to the holders of the Series B Preferred and to the
holders of any Junior Stock, the holders of Series A Preferred shall be entitled
to be paid out of the assets of the Corporation an amount per share equal to the
sum of (i) One Dollar ($1.00) for each outstanding share of Series A Preferred
(the "Original Series A Issue Price") and (ii) an amount equal to all declared
and unpaid dividends on such share. If, upon the occurrence of a liquidation
event, the assets and funds thus distributed among the holders of the Series A
Preferred shall be insufficient to permit the payment to such holders of the
full preferential amount, then the entire assets of the Corporation legally
available for distribution shall be distributed ratably among the holders of the
Series A Preferred, in proportion to the preferential amount each such holder
would have been entitled to receive.

            (b) After the payment of the full liquidation preference of the
Series A Preferred as set forth in Section 3(a) above, the holders of Series B
Preferred shall be entitled to be paid out of the assets of the Corporation
legally available for distribution, an amount per share equal to the sum of (i)
Three Dollars ($3.00) for each outstanding share of Series B Preferred (the
"Original Series B Issue Price") and (ii) an amount equal to all declared and
unpaid dividends on such share. If, upon the occurrence of a liquidation event,
the assets and funds thus distributed among the holders of the Series B
Preferred shall be insufficient to permit the 


<PAGE>   5

payment to such holders of the full preferential amount, then the entire assets
of the Corporation legally available for distribution after the payment of the
full liquidation preference as set forth in Section 3(a) above shall be
distributed ratably among the holders of the Series B Preferred, in proportion
to the preferential amount each such holder would have been entitled to receive.

            (c) After the payment of the full liquidation preference of the
Series A and Series B Preferred as set forth in Sections 3(a) and 3(b) above,
the assets of the Corporation legally available for distribution, if any, shall
be distributed ratably to the holders of the Common Stock, Series A and Series B
Preferred on an as-if-converted to Common Stock basis (as adjusted for stock
splits, recapitalization and the like) until, with respect to the holders of the
Series A Preferred, such holders shall have received an aggregate of Three
Dollars ($3.00) per share (including amounts paid to such holders pursuant to
Section 3(a) above), and with respect to the holders of the Series B Preferred,
such holders shall have received an aggregate of Nine Dollars ($9.00) per share
(including amounts paid to such holders pursuant to Section 3(b) above);
thereafter, the assets of the Corporation legally available for distribution, if
any, shall be distributed ratably to the holders of the Common Stock.

            (d) The following events shall be considered a liquidation under
Section 3(a):

                  (i) any consolidation or merger of the Corporation with or
into any other corporation or other entity or person, or any other corporation
reorganization, in which the stockholders of the Corporation immediately prior
to such consolidation, merger or reorganization, own less than fifty percent
(50%) of the Corporation's voting power immediately after such consolidation,
merger or reorganization, or any transaction or series of related transactions
in which in excess of fifty percent (50%) of the Corporation's voting power is
transferred (an "Acquisition"); or

                 (ii) a sale, lease or other disposition of all or substantially
all of the assets of the Corporation (an "Asset Transfer").

      4.    Conversion Rights.

            The holders of the Series A and Series B Preferred shall have the
following rights with respect to the conversion of such Preferred Stock into
shares of Common Stock:

            (a) Optional Conversion. Subject to and in compliance with the
provisions of this Section 4, any shares of Series A and Series B Preferred may,
at the option of the holder, be converted at any time into fully-paid and
nonassessable shares of Common Stock. The number of shares of Common Stock to
which a holder of Series A or Series B Preferred shall be entitled upon
conversion shall be the product obtained by multiplying the "Series A Conversion
Rate" or the "Series B Conversion Rate," as applicable, then in effect
(determined as provided in Section 4(b)) by the number of shares of Series A or
Series B Preferred being converted, respectively.

            (b) Conversion Rate. The conversion rate in effect at any time for
conversion of the Series A Preferred (the "Series A Conversion Rate") shall be
the quotient obtained by 


<PAGE>   6

dividing the Original Series A Issue Price by the "Series A Conversion Price,"
calculated as provided in Section 4(c). The conversion rate in effect at any
time for conversion of the Series B Preferred (the "Series B Conversion Rate")
shall be the quotient obtained by dividing the Original Series B Issue Price by
the "Series B Conversion Price," calculated as provided in Section 4(c).

            (c) Conversion Price. The initial conversion price per share for
each share of Series A Preferred shall be the Original Series A Issue Price (the
"Series A Conversion Price") and the initial conversion price per share for each
share of Series B Preferred shall be the Original Series B Issue Price (the
"Series B Conversion Price") (collectively, the "Conversion Prices"). Such
initial Conversion Prices shall be adjusted from time to time in accordance with
this Section 4. All references to any Conversion Price herein shall mean such
Conversion Price as so adjusted.

            (d) Mechanics of Conversion. Each holder of Series A and Series B
Preferred who desires to convert such Preferred Stock into shares of Common
Stock pursuant to this Section 4 shall surrender the certificate or certificates
therefor, duly endorsed, at the office of the Corporation or any transfer agent
for such Preferred Stock, and shall give written notice to the Corporation at
such office that such holder elects to convert the same. Such notice shall state
the number of shares of Series A or Series B Preferred being converted.
Thereupon, the Corporation shall promptly issue and deliver at such office to
such holder a certificate or certificates for the number of shares of Common
Stock to which such holder is entitled and shall promptly pay in cash or, to the
extent sufficient funds are not then legally available therefor, in Common Stock
(at the Common Stock's fair market value determined by the Board of Directors as
of the date of such conversion), any declared and unpaid dividends on the shares
of Preferred Stock being converted. Such conversion shall be deemed to have been
made at the close of business on the date of such surrender of the certificates
representing the shares of Preferred Stock to be converted, and the person
entitled to receive the shares of Common Stock issuable upon such conversion
shall be treated for all purposes as the record holder of such shares of Common
Stock on such date.

            (e) Adjustment for Stock Splits and Combinations. If the Corporation
shall at any time or from time to time after the date that the first share of
Series B Preferred is issued (the "Original Series B Issue Date") effect a
subdivision of the outstanding Common Stock, the respective Conversion Prices
for the Series A and Series B Preferred in effect immediately before that
subdivision shall be proportionately decreased. Conversely, if the Corporation
shall at any time or from time to time after the Original Series B Issue Date
combine the outstanding shares of Common Stock into a smaller number of shares,
the respective Conversion Prices for the Series A and Series B Preferred in
effect immediately before the combination shall be proportionately increased.
Any adjustment under this Section 4(e) shall become effective at the close of
business on the date the subdivision or combination becomes effective.

            (f) Adjustment for Common Stock Dividends and Distributions. If the
Corporation at any time or from time to time after the Original Series B Issue
Date makes, or fixes a record date for the determination of holders of Common
Stock entitled to receive, a 


<PAGE>   7

dividend or other distribution payable in additional shares of Common Stock, in
each such event the respective Conversion Prices for the Series A and Series B
Preferred that are then in effect shall be decreased as of the time of such
issuance or, in the event such record date is fixed, as of the close of business
on such record date, by multiplying the respective Conversion Prices for the
Series A or Series B Preferred, as applicable, then in effect by a fraction (1)
the numerator of which is the total number of shares of Common Stock issued and
outstanding immediately prior to the time of such issuance or the close of
business on such record date, and (2) the denominator of which is the total
number of shares of Common Stock issued and outstanding immediately prior to the
time of such issuance or the close of business on such record date plus the
number of shares of Common Stock issuable in payment of such dividend or
distribution; provided, however, that if such record date is fixed and such
dividend is not fully paid or if such distribution is not fully made on the date
fixed therefor, the respective Conversion Prices for the Series A and Series B
Preferred shall be recalculated accordingly as of the close of business on such
record date and thereafter the respective Conversion Prices for the Series A and
Series B Preferred shall be adjusted pursuant to this Section 4(f) to reflect
the actual payment of such dividend or distribution.

            (g) Adjustments for Other Dividends and Distributions. If the
Corporation at any time or from time to time after the Original Series B Issue
Date makes, or fixes a record date for the determination of holders of Common
Stock entitled to receive, a dividend or other distribution payable in
securities of the Corporation other than shares of Common Stock, in each such
event provision shall be made so that the holders of the Series A and Series B
Preferred shall receive upon conversion thereof, in addition to the number of
shares of Common Stock receivable thereupon, the amount of other securities of
the Corporation which they would have received had their Series A or Series B
Preferred, as applicable, been converted into Common Stock on the date of such
event and had they thereafter, during the period from the date of such event to
and including the conversion date, retained such securities receivable by them
as aforesaid during such period, subject to all other adjustments called for
during such period under this Section 4 with respect to the rights of the
holders of the Preferred Stock or with respect to such other securities by their
terms.

            (h) Adjustment for Reclassification, Exchange and Substitution. If
at any time or from time to time after the Original Series B Issue Date, the
Common Stock issuable upon the conversion of the Series A or Series B Preferred,
as applicable, is changed into the same or a different number of shares of any
class or classes of stock, whether by recapitalization, reclassification or
otherwise (other than an Acquisition or Asset Transfer as defined in Section
3(d) or a subdivision or combination of shares or stock dividend or a
reorganization, merger, consolidation or sale of assets provided for elsewhere
in this Section 4), in any such event each holder of Series A or Series B
Preferred shall have the right thereafter to convert such stock into the kind
and amount of stock and other securities and property receivable upon such
recapitalization, reclassification or other change by holders of the maximum
number of shares of Common Stock into which such shares of Series A or Series B
Preferred, as applicable, could have been converted immediately prior to such
recapitalization, reclassification or change, all subject to further adjustment
as provided herein or with respect to such other securities or property by the
terms thereof.


<PAGE>   8

            (i) Reorganizations, Mergers, Consolidations or Sales of Assets. If
at any time or from time to time after the Original Series B Issue Date, there
is a capital reorganization of the Common Stock (other than an Acquisition or
Asset Transfer as defined in Section 3(d) or a recapitalization, subdivision,
combination, reclassification, exchange or substitution of shares provided for
elsewhere in this Section 4) as a part of such capital reorganization, provision
shall be made so that the holders of the Series A and Series B Preferred shall
thereafter be entitled to receive upon conversion of the Series A or Series B
Preferred, as applicable, the number of shares of stock or other securities or
property of the Corporation to which a holder of the number of shares of Common
Stock deliverable upon conversion would have been entitled on such capital
reorganization, subject to adjustment in respect of such stock or securities by
the terms thereof. In any such case, appropriate adjustment shall be made in the
application of the provisions of this Section 4 with respect to the rights of
the holders of Series A and Series B Preferred after the capital reorganization
to the end that the provisions of this Section 4 (including adjustment of the
respective Conversion Price of the Series A and Series B Preferred then in
effect and the number of shares issuable upon conversion of the Series A or
Series B Preferred, as applicable) shall be applicable after that event and be
as nearly equivalent as practicable.

            (j) Conversion Price Adjustments of Preferred Stock for Certain
Dilutive Issuances, Splits and Combinations. The Series A Conversion Price and
the Series B Conversion Price shall be subject to adjustment from time to time
as follows:

                  (1) If at any time or from time to time after the Original
Series B Issue Date, the Corporation issues or sells, or is deemed by the
express provisions of this subsection 4(j) to have issued or sold, Additional
Shares of Common Stock (as hereinafter defined), other than as a dividend or
other distribution on any class of stock as provided in Section 4(f) above, and
other than a subdivision or combination of shares of Common Stock as provided in
Section 4(e) above, for an Effective Price (as hereinafter defined) less than
$.87 per share with respect to the Series A Preferred and/or for an Effective
Price less than $3.00 per share with respect to the Series B Preferred (a
"Dilutive Issuance" with respect to the Series A Preferred and/or the Series B
Preferred, as applicable), then and in each such case the then existing
respective Conversion Price for the Series A and/or Series B Preferred, as
applicable, shall be reduced, as of the opening of business on the date of such
issuance or sale, to a price determined by multiplying such then effective
Conversion Price by a fraction (i) the numerator of which shall be (A) the
number of shares of Common Stock deemed outstanding (as defined below)
immediately prior to such issuance or sale, plus (B) the number of shares of
Common Stock which the aggregate consideration received (as defined in
subsection 4(j)(2)) by the Corporation for the total number of Additional Shares
of Common Stock so issued would purchase at such Series A and/or Series B
Conversion Price, as applicable, and (ii) the denominator of which shall be the
number of shares of Common Stock deemed outstanding (as defined below)
immediately prior to such issuance or sale plus the total number of Additional
Shares of Common Stock so issued. For the purposes of the preceding sentence,
the number of shares of Common Stock deemed to be outstanding as of a given date
shall be the sum of (A) the number of shares of Common Stock actually
outstanding and (B) the number of shares of Common Stock into which the then
outstanding shares of Series A and Series B Preferred could be converted if
fully converted on 


<PAGE>   9

the day immediately preceding the given date.

                  (2) For the purpose of making any adjustment required under
this Section 4(j), the consideration received by the Corporation for any issue
or sale of securities shall (A) to the extent it consists of cash, be computed
at the net amount of cash received by the Corporation after deduction of any
underwriting or similar commissions, compensation or concessions paid or allowed
by the Corporation in connection with such issue or sale but without deduction
of any expenses payable by the Corporation, (B) to the extent it consists of
property other than cash, be computed at the fair value of that property as
determined in good faith by the Board of Directors, and (C) if Additional Shares
of Common Stock, Convertible Securities (as hereinafter defined) or rights or
options to purchase either Additional Shares of Common Stock or Convertible
Securities are issued or sold together with other stock or securities or other
assets of the Corporation for a consideration which covers both, be computed as
the portion of the consideration so received that may be reasonably determined
in good faith by the Board of Directors to be allocable to such Additional
Shares of Common Stock, Convertible Securities or rights or options.

                  (3) For the purpose of the adjustment required under this
Section 4(j), if the Corporation issues or sells any rights or options for the
purpose of, or stock or other securities convertible into, Additional Shares of
Common Stock (such convertible stock or securities being herein referred to as
"Convertible Securities") and if the Effective Price of such Additional Shares
of Common Stock is less than the Series A or Series B Conversion Price, as
applicable, in each case the Corporation shall be deemed to have issued at the
time of the issuance of such rights or options or Convertible Securities the
maximum number of Additional Shares of Common Stock issuable upon exercise or
conversion thereof and to have received as consideration for issuance of such
shares an amount equal to the total amount of consideration, if any, received by
the Corporation for the issuance of such rights or options of Convertible
Securities, plus, in the case of such rights or options, the minimum amounts of
consideration, if any, payable to the Corporation upon the exercise of such
rights or options, plus, in the case of the Convertible Securities, the minimum
amounts of consideration, if any, payable to the Corporation (other than by
cancellation of liabilities or obligations evidenced by such Convertible
Securities) upon the conversion thereof; provided that, if in the case of the
Convertible Securities, the minimum amounts of such consideration cannot be
ascertained, but are a function of antidilution or similar protective clauses,
the Corporation shall be deemed to have received the minimum amounts of
consideration without reference to such clauses; provided further that if the
minimum amount of consideration payable to the Corporation upon the exercise or
conversion of rights, options or Convertible Securities is reduced over time or
on the occurrence or non-occurrence of specified events other than by reason or
antidilution adjustments, the Effective Price shall be recalculated using the
figure to which some minimum amount of consideration is reduced; provided
further that if the minimum amount of consideration payable to the Corporation
upon the exercise or conversion of such rights, options or Convertible
Securities is subsequently increased, the Effective Price shall be again
recalculated using the increased minimum amount of consideration payable to the
Corporation upon the exercise or conversion of such rights, options or
Convertible Securities. No further adjustment of the Series A and/or Series B
Conversion Price, as applicable, as adjusted upon the 


<PAGE>   10

issuance of such rights, options or Convertible Securities shall be made as a
result of the actual issuance of Additional Shares of Common Stock on the
exercise of any such rights or options or the conversion of any Convertible
Securities. If any such rights or options or the conversion privilege
represented by any such Convertible Securities shall expire without having been
exercised, the Series A and/or Series B Conversion Price, as applicable, as
adjusted upon the issuance of such rights, options or Convertible Securities
shall be readjusted to the Series A and/or Series B Conversion Price, as
applicable, which would have been in effect had an adjustment been made on the
basis that the only Additional Shares of Common Stock, if any, actually issued
or sold on the exercise of such rights or options or rights of conversion of
such Convertible Securities, and such Additional Shares of Common Stock, if any,
were issued or sold for the consideration actually received by the Corporation
upon such existence, plus the consideration, if any, actually received by the
Corporation for the granting of all such rights or options, whether or not
exercised, plus the consideration received for issuing or selling the
Convertible Securities actually converted, plus the consideration, if any,
actually received by the Corporation (other than by cancellation of liabilities
or obligations evidenced by such Convertible Securities) on the conversion of
such Convertible Securities, provided that such readjustment shall not apply to
prior conversions of Series A and/or Series B Preferred, as applicable.

                  (4) "Additional Shares of Common Stock" shall mean all shares
of Common Stock issued by the Corporation or deemed to be issued pursuant to
this Section 4(j), whether or not subsequently reacquired or retired by the
Corporation other than (1) shares of Common Stock issued upon conversion of the
Series A or Series B Preferred, (2) shares of Common Stock (and/or options,
warrants or other Common Stock purchase rights, and the Common Stock issued
pursuant to such options, warrants and other rights) issued or to be issued to
employees, officers or directors of, or consultants or advisors to the
Corporation or any subsidiary pursuant to stock purchase or stock option plans
or other arrangements that are approved by the Board, (3) stock, warrants or
other securities or rights issued in connection with equipment leasing or bank
financing transactions, provided such issuances are for other than primarily
equity financing purposes, (4) stock, warrants or other securities or rights
issued to academic or research institutions in connection with (i) the license
of technology from such institutions or (ii) research and development services
provided by such institutions, (5) stock, warrants or other securities or rights
issued in connection with a transaction with a corporation or other third party
which is not primarily in the business of making equity investments that also
involves other strategic elements such as, but not by way of limitation, a joint
marketing agreement, a license agreement or a technology development agreement,
(6) shares of Common Stock issued pursuant to the exercise of options, warrants
or convertible securities outstanding as of the Original Series B Issue Date,
and (7) Common Stock issued pursuant to a transaction described in subsections
4(g), (h) and (i) hereof. The "Effective Price" of Additional Shares of Common
Stock shall mean the quotient determined by dividing the total number of
Additional Shares of Common Stock issued or sold, or deemed to have been issued
or sold by the Corporation under this subsection 4(j), into the aggregate
consideration received, or deemed to have been received, by the Corporation for
such issue under this subsection 4(j), for such Additional Shares of Common
Stock.


<PAGE>   11

            (k) Accountants' Certificate of Adjustment. In each case of an
adjustment or readjustment of the respective Conversion Prices of the Series A
or Series B Preferred for the number of shares of Common Stock or other
securities issuable upon conversion of the Series A or Series B Preferred,
respectively, if such Preferred Stock is then convertible pursuant to this
Section 4, the Corporation, at its expense, shall compute such adjustment or
readjustment in accordance with the provisions hereof and prepare a certificate
showing such adjustment or readjustment, and shall mail such certificate, by
first class mail, postage prepaid, to each registered holder of such Preferred
Stock at the holder's address as shown in the Corporation's books. The
certificate shall set forth such adjustment or readjustment, showing in detail
the facts upon which such adjustment is based, including a statement of (i) the
consideration received or deemed to be received by the Corporation for any
Additional Shares of Common Stock issued or sold or deemed to have been issued
or sold, (ii) the respective Conversion Prices of the Series A or Series B
Preferred, as applicable, at the time in effect, (iii) the number of Additional
Shares of Common Stock, and (iv) the type and amount, if any, of other property
which at the time would be received upon conversion of such Preferred Stock.

            (l) Notices of Record Dates. Upon (i) any taking by the Corporation
of a record of the holders of any class of securities for the purpose of
determining the holders thereof who are entitled to receive any dividend or
other distribution, or (ii) any Acquisition (as defined in Section 3(d),
respectively, or other capital reorganization of the Corporation, any
reclassification or recapitalization of the capital stock of the Corporation,
any merger or consolidation of the Corporation with or into any other
corporation, or any Asset Transfer (as defined in Section 3(d)), or any
voluntary or involuntary dissolution, liquidation or winding up of the
Corporation, the Corporation shall mail to each holder of Preferred Stock at
least twenty (20) days prior to the record date specified therein a notice
specifying (1) the date on which any such record is to be taken for the purpose
of such dividend or distribution and a description of such dividend or
distribution, (2) the date on which any such Acquisition, reorganization,
reclassification, transfer, consolidation, merger, Asset Transfer, dissolution,
liquidation or winding up is expected to become effective, and (3) the date, if
any, that is to be fixed as to when the holders of record of Common Stock (or
other securities) shall be entitled to exchange shares of Common Stock (or other
securities) for securities or other property deliverable upon such Acquisition,
reorganization, reclassification, transfer, consolidation, merger, Asset
Transfer, dissolution, liquidation or winding up.

            (m)   Automatic Conversion.

                  (1) Each share of Series A and Series B Preferred shall
automatically be converted into shares of Common Stock, based on the
then-effective respective Series A and Series B Conversion Prices, at any time
upon the affirmative vote of the holders of at least a majority of the
outstanding shares of Preferred Stock, or immediately upon the closing of a
firmly underwritten public offering pursuant to an effective registration
statement under the Securities Act of 1933, as amended, covering the offer and
sale of Common Stock for the account of the Corporation in which (i) the per
share price is at least Seven Dollars ($7.00) (as adjusted for stock splits,
recapitalization and the like), and (ii) the gross cash proceeds to the
Corporation (before underwriting discounts, commissions and fees) are at least
Ten Million 


<PAGE>   12

Dollars ($10,000,000). Upon such automatic conversion, any accumulated and
unpaid dividends shall be paid in accordance with the provision of Section 4(d).

                  (2) Upon the occurrence of the event specified in paragraph
(1) above, the outstanding shares of Series A and Series B Preferred shall be
converted automatically without any further action by the holders of such shares
and whether or not the certificate representing such shares are surrendered to
the Corporation or its transfer agents; provided, however, that the Corporation
shall not be obligated to issue certificates evidencing the shares of Common
Stock issuable upon such conversion unless the certificate evidencing such
shares of Preferred Stock are either delivered to the Corporation or its
transfer agent as provided below, or the holder notifies the Corporation or its
transfer agent that such certificates have been lost, stolen or destroyed and
executes an agreement satisfactory to the Corporation to indemnify the
Corporation from any loss incurred by it in connection with such certificates.
Upon the occurrence of such automatic conversion of the Series A and Series B
Preferred, as applicable, the holders of such Preferred Stock shall surrender
the certificates representing such shares at the office of the Corporation or
any transfer agent for the Preferred Stock. Thereupon, there shall be issued and
delivered to such holder promptly at such office and in its name as shown on
such surrendered certificate or certificates, a certificate or certificates for
the number of shares of Common Stock into which the shares of Preferred Stock
surrendered were convertible on the date on which such automatic conversion
occurred, and the Corporation shall promptly pay in cash or, at the option of
the Corporation, Common Stock (at the Common Stock's fair market value
determined by the Board as of the date of such conversion), or, at the option of
the Corporation, both, all declared and unpaid dividends on the shares of Series
A and Series B Preferred being converted, to and including the date of such
conversion.

            (n) Fractional Shares. No fractional shares of Common Stock shall be
issued upon conversion of the Series A or Series B Preferred. All shares of
Common Stock (including fractions thereof) issuable upon conversion of more than
one share of Series A or Series B Preferred by a holder thereof shall be
aggregated for purposes of determining whether the conversion would result in
the issuance of any fractional share. If, after the aforementioned aggregation,
the conversion would result in the issuance of any fractional share, the
Corporation shall, in lieu of issuing any fractional share, pay cash equal to
the product of such fraction multiplied by the Common Stock's fair market value
(as determined by the Board) on the date of conversion.

            (o) Reservation of Stock Issuable Upon Conversion. The Corporation
shall at all times reserve and keep available out of its authorized but unissued
shares of Common Stock, solely for the purpose of effecting the conversion of
the shares of Series A and Series B Preferred, such number of its shares of
Common Stock as shall from time to time be sufficient to effect the conversion
of all outstanding shares of Series A and Series B Preferred. If at any time the
number of authorized but unissued shares of Common Stock shall not be sufficient
to effect the conversion of all then outstanding shares of Preferred Stock, the
Corporation will take such corporate action as may, in the opinion of its
counsel, be necessary to increase its authorized but unissued shares of Common
Stock to such number of shares as shall be sufficient for such purpose.


<PAGE>   13

            (p) Notices. Any notice required by the provisions of this Section 4
shall be in writing and shall be deemed effectively given: (i) upon personal
delivery to the party to be notified, (ii) when sent by confirmed telex or
facsimile if sent during normal business hours of the recipient; if not, then on
the next business day, (iii) five (5) days after having been sent by registered
or certified mail, return receipt requested, postage prepaid, or (iv) one (1)
day after deposit with a nationally recognized overnight courier, specifying
next day delivery, with written verification of receipt. All notices shall be
addressed to each holder of record at the address of such holder appearing on
the books of the Corporation.

            (q) Payment of Taxes. The Corporation will pay all taxes (other than
taxes based upon income) and other governmental charges that may be imposed with
respect to the issue or delivery of shares of Common Stock upon conversion of
shares of Series A and Series B Preferred, excluding any tax or other charge
imposed in connection with any transfer involved in the issue and delivery of
shares of Common Stock in a name other than that in which the shares of the
Preferred Stock so converted were registered.

            (r) No Dilution or Impairment. The Corporation shall not amend its
Restated Certificate or participate in any reorganization, transfer of assets,
consolidation, merger, dissolution, issue or sale of securities or any other
voluntary action, for the purpose of avoiding or seeking to avoid the observance
or performance of any of the terms to be observed or performed hereunder by the
Corporation, but shall at all times in good faith assist in carrying out all
such action as may be reasonably necessary or appropriate in order to protect
the conversion rights of the holders of the Series A and Series B Preferred
against dilution or other impairment.

      5. No Reissuance. No share or shares of Series A or Series B Preferred
acquired by the Corporation by reason of redemption, purchase, conversion or
otherwise shall be reissued.

      D. The rights, preferences, privileges, restrictions and other matters
relating to the Common Stock are as follows:

      1. Dividend Rights. Subject to the prior rights of holders of all classes
of stock at the time outstanding having prior rights as to dividends, the
holders of the Common Stock shall be entitled to receive, when and as declared
by the Board of Directors, out of any assets of the Corporation legally
available therefor, such dividends as may be declared from time to time by the
Board of Directors.

      2. Liquidation Rights. Upon the liquidation, dissolution or winding up of
the Corporation, the assets of the Corporation shall be distributed as provided
in Section 3 of Article IV hereof.

      3. Redemption. The Common Stock is not redeemable; provided, however, that
this restriction shall not apply to the repurchase of shares of Common Stock
from employees, officers, directors, consultants or other persons performing
services for the Corporation or any subsidiary pursuant to agreements under
which the Corporation has the option to repurchase such shares at cost or at
cost upon the occurrence of certain events, such as the termination of
employment.


<PAGE>   14

      4. Voting Rights. The holder of each share of Common Stock shall have the
right to one vote, and shall be entitled to notice of any stockholders' meetings
in accordance with the Bylaws of the Corporation, and shall be entitled to vote
upon such matters and in such manner as may be provided by law.

                                    ARTICLE V

      A director of the Corporation shall, to the fullest extent permitted by
the Delaware General Corporation Law as it now exists or as it may hereafter be
amended, not be liable to the Corporation or its stockholders for monetary
damages for breach of fiduciary duty as a director. Neither any amendment or
repeal of this Article V, nor the adoption of any provision of this Restated
Certificate inconsistent with this Article V, shall eliminate or reduce the
effect of this Article V in respect of any matter occurring, or any cause of
action, suit or claim that, but for this Article V, would accrue or arise, prior
to such amendment, repeal or adoption of any inconsistent provision.

                                   ARTICLE VI

      To the fullest extent permitted by applicable law, the Corporation is also
authorized to provide indemnification of (and advancement of expenses to) such
agents (and any other persons to which Delaware law permits the Corporation to
provide indemnification) through Bylaw provisions, agreements with such agents
or other persons, vote of stockholders or disinterested directors or otherwise,
in excess of the indemnification and advancement otherwise permitted by Section
145 of the General Corporation Law of the State of Delaware, subject only to
limits created by applicable Delaware law (statutory or non-statutory), with
respect to actions for breach of duty to the Corporation, its stockholders and
others.

      Any repeal or modifications of any of the foregoing provisions of this
Article VI shall not adversely affect any right or protection of a director,
officer, agent or other person existing at the time of, or increase the
liability of any director of the Corporation with respect to any acts or
omissions of such director, officer or agent occurring prior to such repeal or
modification.

                                   ARTICLE VII

      For the management of the business and for the conduct of the affairs of
the Corporation, and in further definition, limitation and regulation of the
powers of the Corporation, of its directors and of its stockholders or any class
thereof, as the case may be, it is further provided that:

      1. The management of the business and the conduct of the affairs of the
Corporation shall be vested in its Board of Directors. The number of directors
which shall constitute the whole Board of Directors shall be fixed by the Board
of Directors in the manner provided in the Bylaws.

      2. The Board of Directors may from time to time make, amend, supplement or
repeal the Bylaws; provided, however, that the stockholders may change or repeal
any Bylaw adopted 


<PAGE>   15

by the Board of Directors by the affirmative vote of the holders of a majority
of the voting power of all of the then outstanding shares of the capital stock
of the Corporation; and, provided further, that no amendment or supplement to
the Bylaws adopted by the Board of Directors shall vary or conflict with any
amendment or supplement thus adopted by the stockholders.

      3. The directors of the Corporation need not be elected by written ballot
unless the Bylaws so provide.

                                  ARTICLE VIII

      The Corporation reserves the right to amend, alter, change or repeal any
provision contained in this Restated Certificate, in the manner now or hereafter
prescribed by statute, and all rights conferred upon the stockholders herein are
granted subject to this right.

                                     * * * *

      SIXTH: That thereafter said amendment and restatement was duly adopted in
accordance with the provisions of Section 242 and Section 245 of the Delaware
General Corporation Law by obtaining a majority vote of each of the Common Stock
and Preferred Stock, in favor of said amendment and restatement in the manner
set forth in Section 228 of the Delaware General Corporation Law.

      IN WITNESS WHEREOF, Corixa Corporation has caused this Certificate to be
signed by the President and the Secretary this 24th day of September, 1997.

                                    CORIXA CORPORATION


                                    /s/ Steven Gillis
                                    Steven Gillis, Ph.D.
                                    President and Chief Executive Officer

ATTEST

/s/ William W. Ericson
William W. Ericson, Secretary

<PAGE>   1
                                                                    EXHIBIT 10.9



                           TUBERCULOSIS COLLABORATION
                              AND LICENSE AGREEMENT


                                     BETWEEN


                               CORIXA CORPORATION


                                       AND


                       SMITHKLINE BEECHAM BIOLOGICALS S.A.








                                      -1-
<PAGE>   2



                                TABLE OF CONTENTS


<TABLE>
<S>                                                                       <C>
1.   Scope of Research Program; Other Activities                           3
2.   Product(s)                                                            3
3.   Territory                                                             4
4.   Option: Right of First Negotiation                                    4
5.   Option and Research Program Term and Termination                      5
6.   License Payments                                                      6
7.   Royalties                                                             7
8.   Other Terms                                                           9
9.   Definitions                                                          10
10.  Joint Research Team                                                  12
11.  Equity                                                               13
12.  Inventions                                                           13
13.  Patents; Prosecution and Litigation                                  13
14.  Confidentiality; Publicity; Publications                             15
15.  Governing Law; Arbitration                                           16
16.  Miscellaneous                                                        17
17.  Notices                                                              18
18.  Assignment                                                           18
19.  Warranties and Representations                                       18
20.  Term and Termination                                                 19
21.  Rights and Duties Upon Termination                                   20
22.  Indemnification                                                      20
Schedule 1                                                                22
</TABLE>



                                      -2-


<PAGE>   3


                TUBERCULOSIS COLLABORATION AND LICENSE AGREEMENT

         THIS TUBERCULOSIS COLLABORATION AND LICENSE AGREEMENT (together, with
the attachments hereto, the "Agreement ") is entered into the 6th day of
October, 1995 (the "Effective Date") by and between CORIXA CORPORATION, a
Delaware corporation with its principal place of business located at 1124
Columbia Street, Suite 464, Seattle, Washington 98104 ("Corixa") and SmithKline
Beecham Biologicals S.A., a Belgian corporation with its principal place of
business at Rue de l'Institut 89, B-1330 Rixensart, Belgium ("SB")

                                   WITNESSETH:

         WHEREAS, Corixa and SB desire to collaborate in the research and
development of antigens for the development of a vaccine product or products for
the prevention and/or treatment of tuberculosis and wish to memorialize their
agreement with respect to such collaboration in this Agreement;

         WHEREAS, Corixa has agreed to license certain intellectual property
rights related to the subject matter of the collaboration subject to the terms
and conditions of this Agreement;

         NOW, THEREFORE, for and in consideration of the mutual observance of
the covenants hereinafter set forth and other good and valuable consideration,
the receipt of which is hereby acknowledged, the parties hereto agree as
follows:

1. SCONE OF RESEARCH PROGRAM; OTHER ACTIVITIES. The parties will collaborate in
the discovery and development of antigens for use in vaccine(s) for the
prevention and/or treatment of mycobacterium tuberculosis hereinafter "Mtb").
The program of activities to be conducted by Corixa and SB during the term of
the Agreement is set forth in Schedule 1 (the "Research Program"). No material
deviation in the subject matter and scope of such Research Program shall be made
without the mutual and written agreement of both parties.

         Except as set forth in Sections 4.b. and 5.c. respectively, during the
term of this Agreement, Corixa shall not enter into any commercial agreement
with a third party with respect to a collaboration regarding Mtb.
Notwithstanding the preceding sentence, Corixa may enter into research
agreements that provide for the in-licensing of intellectual property that may
be useful in the collaboration described in this Agreement; provided that any
such agreement shall provide that Corixa will own and/or control all
intellectual property rights related to Mtb arising from such agreement.

2. PRODUCT(S). The objective of the Research Program will be the development of
a Mtb vaccine consisting [***] and possibly consisting, in addition to [***] of
[***] (collectively, the "Product"). At SB's option, such combinations may
result in discrete versions of the Product, consisting of potentially different
mixtures of [***]. Also included in the Product and in the licenses granted
herein shall be [***].



                                      -3-
<PAGE>   4

3.       TERRITORY.  The Territory is divided into two parts:

   
         (a)  Subterritory A includes all countries worldwide except Japan; and

         (b)  Subterritory B includes only Japan.
    

4.       OPTION: RIGHT OF FIRST NEGOTIATION.

         (a)  SB will have an option, exercisable at any time during the Option
              Term (as defined below) through written notice to Corixa to have
              (i) an exclusive license under the Corixa Patents and Joint
              Research Program Patents (each as defined in Section 9 below) and
              under any Know-How (as defined in Section 9 below) to make, have
              made, use, sell and have sold any and all Product(s) in any
              formulation, configuration and/or combination in Subterritory A
              for use as an in vivo administered vaccine for the prevention
              and/or treatment of Mtb in humans and (ii) a co-exclusive (with
              Corixa) license under the Corixa Patents and Joint Research
              Program Patents (as defined in Section 9 below) and under any
              Know-How (as defined in Section 9 below) to make, have made, use,
              sell and have sold any and all Product(s) in any formulation,
              configuration and/or combination in Subterritory B for use as an
              in vivo administered vaccine for the prevention and/or treatment
              of Mtb in humans (collectively, the "Option"). Upon exercise of
              such Option and payment of the amount set forth in subparagraph 6
              (b) (i), the licenses described in this subparagraph shall be in
              full force and effect. Such licenses will include hill rights of
              sublicense by SB. SB agrees it will exercise at least the same
              level of diligence in the clinical development and
              commercialization of Product within Subterritory A as it currently
              uses, or in the past has used, with respect to its own
              commercially successful products.

         (b)  During the Option Term (as it may be extended from time to time),
              SB or any Affiliate (as defined in Section 9 below) shall have the
              first right to negotiate for a license to diagnostic,
              pharmaceutical and/or ex vivo prophylactic and/or therapeutic
              vaccine applications of technology and/or patents owned and/or
              controlled by Corixa in the field of Mtb at such time (including
              Corixa Patents and Joint Research Program Patents) as follows.
              From time to time as appropriate, Corixa shall give notice to SB
              that its technology and/or patents are available for license,
              which notice shall contain hill disclosure of information
              available to Corixa with respect to such technology and/or patents
              and terms upon which Corixa would be willing to enter into such a
              license for such patents and/or technology. Thereafter, if within
              [***] SB does not respond by agreeing to the terms proposed by
              Corixa or with a comprehensive term sheet of a license agreement
              for such technology and/or patents acceptable to Corixa, Corixa
              shall have the right to present such technology and/or patents to
              third parties with a view towards entering into a collaborative
              agreement with such third parties with respect to such patents
              and/or technology. In the event that SB does respond within the
              aforementioned [***] period with agreement to the terms presented
              by Corixa or with a comprehensive term sheet that is acceptable to
              Corixa, SB shall enter into a written binding letter of intent
              based on the terms set forth in such


                                      -4-


<PAGE>   5
              comprehensive term sheet within the [***] period immediately
              following Corixa's notification of acceptance. In the event the
              proposal contained in the term sheet presented by SB within the
              [***] period is not acceptable to Corixa, Corixa shall inform SB
              in writing and agrees that before entering into any arrangement
              with a third party, Corixa will, within the [***] period following
              the initiation [***], offer SB the right to match any terms
              offered by such third party during such [***] period; provided
              that SB must agree in writing to such terms within the [***]
              described above or Corixa will be free to enter into an
              arrangement with a third party. During the [***], Corixa shall
              provide SB with periodic updates on material developments with
              respect to the technology and/or patents provided to SB. In all
              cases, after the [***], Corixa shall be free to enter
              into an arrangement with a third party with respect to patents
              and/or technology previously presented to SB.

         (c)  With the exception of the license, negotiation and/or first
              refusal rights [***] applications set forth in this Agreement, all
              rights to other applications of the Corixa Patents and/or
              Know-How, including veterinary applications, remain with Corixa.
              Ownership of Joint Research Program Patents shall be as set forth
              in Section 12.

         (d)  In the event that a governmental agency in any country or
              territory grants or compels Corixa to grant a license to any third
              party for product(s) that compete(s) with Product, SB shall have
              the benefit in such country or territory (and any other country
              into which products that compete with Products are sold by such
              third party compulsory licensee) of the terms granted to such
              third party to the extent that such terms are more favorable to
              the third party than those granted to SB under this Agreement.

5.       OPTION AND RESEARCH PROGRAM TERM AND TERMINATION

         (a)  The Research Program will have an initial term of two (2) years,
              effective 1 June, 1995 and ending 31 May, 1997.

         (b)  The Option term will be effective from 1 September, 1995 to 30
              August, 1997 ("Option Term"). In the event SB exercises its
              Option, SB shall have no obligation to renew the Research Program
              beyond the second year, and any such renewal shall be at SB's
              entire discretion. In the event both parties are agreed, the
              Research Program and Option may be renewed on terms to be mutually
              agreed at the time of renewal. However, in the event Corixa fails
              to deliver, within the Option Term, [***] the Option Term shall be
              automatically and without further consideration extended by the
              shorter of three (3) months following [***], or one (1) year from
              the end of the Option Term. If after such time Corixa has still
              failed to [***] to SB, SB shall have a first right of refusal on


                                      -5-
<PAGE>   6
              terms at least as favorable as the Option herein contained of
              three (3) years on any Mtb intellectual property rights owned
              and/or controlled by Corixa for vaccine use in humans.

         (c)  At least six (6) months prior to the end of the initial Option
              Term and provided Corixa has met the milestone [***] as set 
              forth in subparagraph 5.b, SB shall, if it so desires, provide
              Corixa with a written notice of its intent to renew the Research
              Program and extend its Option for a minimum of one (1) additional
              year. In the event SB does not provide such notice, and provided
              SB has not exercised its Option, Corixa shall be free to initiate
              discussions and negotiations with other parties pertaining to
              future rights to products and future research programs in the area
              of Mtb, provided, however, that in the event Corixa agrees to
              terms with respect to a research agreement in the area of Mtb with
              a party other than SB prior to ninety (90) days before the end of
              the Option Term, SB shall have a right of first refusal to extend
              the Research Program and/or Option Term on the same or better
              terms. Such right of refusal shall terminate at the end of the
              Option Term. Notwithstanding anything to the contrary in this
              Agreement including but not limited to the fact that Corixa may
              have entered into discussions and has agreed to terms with a third
              party as set forth above, the parties will maintain the right to
              extend the Option and to continue the Research Program on terms
              mutually acceptable to the parties, and SB will maintain its right
              to exercise the Option, until the Option Term expires.

         (d)  Notwithstanding anything to the contrary in this Agreement, in the
              event SB exercises its Option, to which it retains full right
              until expiration of the Option Term, SB shall have the licenses
              set forth in Section 4(a) and Corixa shall have no residual rights
              to Corixa Patents, Joint Research Program Patents and/or Know-How
              for use as an in vivo administered vaccine for the prevention
              and/or treatment of Mtb in humans, other than specifically
              mentioned in Section 4(a), 4(b) and 4(c).


6.       LICENSE PAYMENTS.  SB will make the following payments to Corixa under
the Agreement by wire transfer of immediately available funds:

         (a)  As a technology access fee, (i) [***] upon execution of the
              Agreement; (ii) [***] on December 1, 1995; (iii) [***] on March 1,
              1996; (iv) [***] on June 1, 1996; (v) [***] on September 1, 1996;
              (vi) [***] on December 1, 1996; and (vii) [***] on March 1, 1997.

         (b)  In the event SB exercises the Option to the license under Section
              4(a) above SB agrees to pay Corixa the following fees:

              (i)   as a condition of such exercise, the sum of [***] via wire
                    transfer of immediately available hinds; and


                                      -6-


                                     
<PAGE>   7
              (ii)  subsequent one-time milestone payments, made via wire
                    transfer of immediately available funds, based upon
                    completion of the following with respect to the first
                    Product:

<TABLE>
                    <S>                                    <C>
                    A)  start Phase 1 clinical trials      :  [***]
                                                              US dollars)

                    B)  end Phase 1 clinical trials        :  [***]
                                                              US dollars)

                    C)  end Phase 2 clinical trials        :  [***]
                                                              US dollars)

                    D)  end Phase 3 clinical trials        :  [***] US dollars)

                    E)  Regulatory Approval in at          :  [***] US dollars)
                        least one (1) major country
                        of Europe (being UK, France,
                        Germany, Italy or Spain)

                    F)  Regulatory Approval in USA         :  [***]
</TABLE>

         Regulatory approval milestones will be creditable against future
         royalties, provided royalties are not reduced by more than [***]
         in any given year. Any uncredited portion will be carried forward 
         for credit in subsequent years.


         (c)  In the event SB wishes to extend the Research Program and the
              Option Term, the following technology access fees are foreseen,
              which will be increased or decreased by mutual agreement of the
              parties based upon the scope of work to be conducted:

              i)   For the [***] year [***] US dollars)

              ii)  For the [***] year [***] US dollars)

7.       ROYALTIES.  SB will pay Corixa a royalty on Net Sales of Products as
follows:

         (a)  Subject to subparagraph (b) below, on annual Net Sales of Products
              sold in countries where current claims of any Corixa Patent and/or
              Joint Research Program Patent are issued or pending for no longer
              than [***], SB shall pay a royalty on annual Net Sales of
              each Product. Such royalty shall increase for Net Sales above
              certain levels and shall be payable as follows: (i) on the portion
              of annual Net Sales of a given Product up to the [***], SB shall
              pay a royalty of [***] per annum; (ii) on the portion of annual
              Net Sales of a given Product between [***], SB shall pay a royalty
              of [***] per annum and (iii) on the portion of annual Net Sales of
              a given Product over [***], SB shall pay a royalty of [***] per
              annum (the "Patent Royalty").



                                      -7-


                                     
<PAGE>   8
         (b)  Provided SB has actually received and uses Know-How from Corixa in
              any Product, which Know-How is Secret, Substantial and has been
              Identified by Corixa, the percentage royalty rates specified in
              subparagraph 7(a) above will be paid but reduced [***] for any
              Product sold into a country where, (x) a patent application for a
              Corixa Patent and/or a Joint Research Program Patent with claims
              covering the Product has been pending and no patent with claims
              covering such Product has issued for a period of more than 
              [***] or (y) no patent application with claims covering such
              Product has been filed in the country of sale (the "Know-How
              Royalty"). Royalties under this subparagraph 7(b) shall expire, on
              a country-by-country basis, [***] after first launch of a Product
              in any such country. For purposes of this Agreement, the terms
              "Corixa Patents," "Joint Research Program Patents," "SB Patents",
              "Know-How", "Secret", "Substantial" and "Identified" shall have
              the meaning as ascribed to such terms in Section 9, below.

         (c)  Except for additional Mtb antigens, which shall be treated as set
              forth in Section 9(a)(ii) hereof, and/or third party(ies) blocking
              patents covering antigens licensed hereunder which are covered in
              Section 7(d) hereof, SB and Corixa shall [***], which may include
              but shall not be limited to royalties payable for adjuvants and
              other technology included in the Product. Corixa's contribution to
              such share shall be through a reduction in the patent royalty
              payable to Corixa by SB, provided however that there shall in no
              event be a reduction in the royalty rate payable to Corixa greater
              than [***] (i.e. reducing the rate from [***] on the portion of
              all sales of a given Product up to annual Net Sales of [***] on
              the portion of all sales of a given Product for annual Net Sales
              of between [***], and [***] on the portion of all sales of given
              Product for annual Net Sales exceeding [***]. For the Know-How
              Royalty, the royalty rates, as set forth in subparagraph 7(b)
              shall apply on the rates as reduced according to this subparagraph
              7(c), provided SB has royalty obligations towards third party(ies)
              on its sales in those countries.

         (d)  In the event of an issued third party blocking patent covering
              antigens licensed hereunder, royalty obligations to the third
              party will be [***] provided that in no event shall royalties paid
              to Corixa be reduced to more than [***] of the otherwise payable
              royalty.

         (e)  SB shall provide a royalty report and, if applicable, a royalty
              payment to Corixa every six (6) months. The report and payment
              relating to Net Sales shall be provided within sixty (60) days
              after June 30 and December 31 of each calendar year and shall
              include all Net Sales of Products or Combination Products (as
              defined in Paragraph 9 below) by SB and its Affiliates, licensees
              or sublicensees. SB shall keep, and require any Affiliate,
              licensee and sublicensee to keep, for a period not less than five
              (5) years, complete and accurate records of all Net Sales of each
              Product and Combination Product. Corixa shall have the right, at
              Corixa's sole expense, through a certified public accountant
              reasonably acceptable to SB,


                                     
                                      -8-
<PAGE>   9
              and following reasonable notice, to examine such records during
              regular business hours during the life of the SB obligation to pay
              royalties on Product and Combination Product; provided, however,
              that such examination shall not (i) be of records for more than
              the prior two (2) years, (ii) take place more often than once a
              year, and (iii) cover any records which date prior to the date of
              the last examination, and provided further that such accountants
              shall report to Corixa only as to the accuracy of the royalty
              statements and payments. Copies of such reports shall be supplied
              to SB. In the event the report demonstrates that SB has underpaid
              royalties, SB shall pay such royalties immediately upon request of
              Corixa. If SB has overpaid royalties, SB may deduct such
              over-payments from future royalties owed to Corixa.

         (f)  In addition to, and simultaneous with, the royalty reports set
              described in Section 7(e) above, SB's Senior Vice President and
              General Manager shall deliver to Corixa a certificate (the
              "Royalty Certificate") stating that during the previous six (6)
              month period, the following factors (the "Royalty Factors") have
              equaled in the aggregate no more than [***] of total sales of
              Product during such six (6) month period: (i) normal customary
              trade discounts allowed and taken; (ii) rebates to wholesalers;
              (iii) any deductions allowed for government-mandated vaccine
              insurance premiums, such as the National Childhood Vaccine Injury
              Act in the US; and (iv) any deduction, at standard cost, for
              special administration devices and the packaging and filling
              thereof, such as pre-filled syringes. In the event the Royalty
              Factors exceed [***] in any six (6) month period, SB may deduct
              such greater percentage for such six (6) month period only, but
              shall provide Corixa with a written explanation setting forth the
              reasons for such excess and shall provide Corixa with a
              certificate that will state that the pricing of all Products sold
              by SB and/or its Affiliates has been on an "arms length" basis and
              not set so as to subsidize sales of other products sold by SB
              and/or its Affiliates. In the event of a disagreement with respect
              to size of the Royalty Factors in any given six (6) month period,
              the CEO of Corixa and the Senior Vice President and General
              Manager of SB shall first attempt to resolve such disagreement
              through good faith negotiation. In the event such resolution is
              not achieved, the disagreement shall finally be resolved through
              arbitration pursuant to Section 15 hereof.

         (g)  Royalties shall be paid by SB in US dollars with currency
              conversions calculated based upon the applicable closing exchange
              rates quoted by the Foreign exchange desk of the General de
              Banque, Brussels, Belgium on the last business day of the
              applicable six (6) month period.

8.       OTHER TERMS.

         (a)  MARKETING RIGHTS. Upon receipt of regulatory approval in the
              Territory, SB shall use its reasonable commercial efforts to
              launch and market the Product. Under the license granted herein,
              SB may select sublicensees to maximize market penetration. Corixa
              may review product marketing plans prior to launch and annually,
              provided arrangements for such reviews are made in advance, but SB
              will have the right to 



                                      -9-
<PAGE>   10
              make all final determinations with respect to any differences of
              opinion that arise as part of such review.

         (b)  MANUFACTURING. Corixa will provide reasonable quantities of
              preclinical test material for SB as required through the course of
              the Research Program at no additional charge to SB. These
              materials will include sufficient quantities of [***]. It is
              anticipated that SB will provide for later stage (clinical) and
              commercial requirements.

         (c)  PRODUCT DEVELOPMENT. SB shall have responsibility for, and control
              of, the development and commercialization of each Product arising
              from this Agreement, including process development, delivery
              system and formulation development, preclinical studies, clinical
              studies, sales and marketing; provided however, that in no event
              shall this paragraph be deemed to limit in any way SB's diligence
              obligations with respect to development and commercialization of
              Product set forth in Section 4(a) hereof.

9.       DEFINITIONS.

         (a)  NET SALES.

              (i)   For purposes of this Agreement, Net Sales shall be defined
                    to mean the aggregate amounts invoiced by SB or its
                    Affiliates, licensees or sublicensees to non-Affiliate third
                    parties, less (i) normal customary trade discounts allowed
                    and taken; (ii) rebates to wholesalers; (iii) returns; (iv)
                    amounts for transportation including insurance; (v) shipping
                    charges to purchasers if invoiced separately; (vi) taxes
                    (not including any income taxes), and duties levied on
                    sales; (vii) deduction allowed for government-mandated
                    vaccine insurance premiums, such as the National Childhood
                    Vaccine Injury Act in the US; (viii) a deduction, at
                    standard cost, for special administration devices and the
                    packaging and filling thereof such as pre-filled syringes;
                    provided, in no event shall the total of items (iii) through
                    (vi) exceed [***] of Net Sales. Any commercial use of a
                    Product by SB (including its Affiliates, licensees and sub
                    licensees) shall be considered a sale hereunder for
                    accounting and royalty purposes.

              (ii)  [***]


              (iii) [***]


                                      -10-

<PAGE>   11
         (b)  KNOW-HOW shall mean all technical information, materials and
              know-how owned and/or controlled by Corixa now and/or during the
              longer of the Option Term or the term of the Research Program, as
              may be extended from time to time, which relates to Product and
              shall include, without limitation, all chemical, pharmacological,
              toxicological, clinical, assay, control and manufacturing data
              and any other information relating to Product and useful for the
              development and commercialization of Product.

         (c)  SECRET shall mean that the Know-How as a body or in the precise
              configuration and assembly of its components is not generally
              known or easily accessible, so that part of its value consists in
              the lead-time SB gains when it is communicated to it; Know-How is
              not limited to the narrow sense that each individual component of
              the Know-How should be totally unknown or unobtainable outside the
              Corixa's business.

         (d)  SUBSTANTIAL shall mean that the Know-How includes information
              which is of importance for the whole or a significant part of (i)
              a manufacturing process or (ii) a product or service, or (iii) for
              the development thereof and excludes information which is trivial.
              Such Know-How must thus be useful, i.e., can reasonably be
              expected at the date of conclusion of the Agreement to be capable
              of improving the competitive position of SB, for example by
              helping SB to enter a new market or giving SB an advantage in
              competition with other manufacturers or providers of services who
              do not have access to the licensed Secret Know-How or other
              comparable Secret know-how;

         (e)  IDENTIFIED shall mean that the Know-How is described or recorded
              in such a manner as to make it possible to verify that it fulfills
              the criteria of secrecy and substantiality and to ensure that SB
              is not unduly restricted in its exploitation of its own
              technology. To be identified the Know-How can either be set out in
              this Agreement or in a separate document or recorded in any other
              appropriate form at the latest when the Know-How is transferred or
              shortly thereafter, provided that the separate document or other
              record can be made available if the need arises.

         (f)  AFFILIATE shall mean any entity owned, owning or under common
              ownership with a party to this Agreement to the extent of at least
              fifty percent (50%) of the equity (or such lesser percentage which
              is the maximum allowed to be owned by a foreign corporation in a
              particular jurisdiction) having the power to vote on or direct the
              affairs of the entity and any person, firm, partnership,
              corporation or other entity actually controlled by, controlling or
              under common control with a party to this Agreement.


                                      -11-
<PAGE>   12
         (g)  CORIXA PATENTS shall mean all patents and patent applications
              (including those arising from the Research Program) which are now
              or become owned and/or controlled by Corixa during the longer of
              the Option Term or the term of the-Research Program, as may be
              extended from time to time, under which Corixa otherwise has, now
              or in the future, the right to grant licenses, which generically
              or specifically claim all or part of Product, a process for
              manufacturing Product, intermediates used in such process or a use
              of Product and any and all technology(ies) generated solely by
              Corixa during the Research Program. Included with the definition
              of Corixa Patents are any continuations, continuations-in-part,
              divisions, patents of addition, reissues, renewals or extensions
              thereof. Also included within the definition of Corixa Patents are
              any patent applications which generically or specifically claim
              any improvements on Product or intermediates or manufacturing
              processes required or useful for production of Product which are
              developed by Corixa, or which Corixa otherwise has the right to
              grant licenses, now or in the future during the longer of the
              Option Term or the term of the Research Program, as may be
              extended from time to time. In no event shall Corixa Patents be
              deemed to include SB Patents.

         (h)  JOINT RESEARCH PROGRAM PATENTS shall mean all patents and patent
              applications which cover Joint Inventions and which generically or
              specifically claim Product, a process for manufacturing Product,
              and intermediates used in such process or a use of Product and any
              and all technology(ies) generated during the Research Program.
              Included with the definition of Joint Research Program Patents are
              any continuations, continuations-in-part, divisions, patents of
              addition, reissues, renewals or extensions thereof. Also included
              within the definition of Joint Research Program Patents are any
              patent applications which generically or specifically claim any
              improvements on Product or intermediates or manufacturing
              processes required or useful for production of Product which are
              developed jointly by Corixa and SB during the longer of the Option
              Term or the term of the Research Program, as may extended from
              time to time. In no event shall Joint Research Program Patents be
              deemed to include SB Patents.

         (i)  SB PATENTS shall mean all patents and patent applications which
              are now or become owned and/or controlled by SB (other than
              jointly with Corixa), which SB otherwise has, now or in the
              future, the right to grant licenses, which generically or
              specifically claim an antigen or adjuvant included in Product.
              Included with the definition of SB Patents are any continuations,
              continuations-in-part, divisions, patents of addition, reissues,
              renewals or extensions thereof. In no event shall SB Patents be
              deemed to include either Corixa Patents or Joint Research Program
              Patents.

10.      JOINT RESEARCH TEAM.

         (a)  A Joint Research Team will be established within thirty (30) days
              after the full execution of this Agreement, responsible for
              regular coordination and monitoring of the research activities.
              The team will consist of at least two (2) individuals from each of
              SB and Corixa. To facilitate such coordination, the parties will
              share all research data generated in this collaboration with each
              other on a prompt and regular basis, which shall be at a minimum,
              every three (3) months. The data


                                      -12-

<PAGE>   13
              generated shall be subject to the confidentiality provisions of
              Paragraph 14 of this Agreement. The Joint Research Team will
              review the Research Program annually, implement any mutually
              agreeable modifications and make recommendations related to
              possible Research Program or Option extensions to the respective
              senior management teams of each company. In the event that the
              members of the Joint Research Team are unable to agree on a
              particular course of action, any such disagreement shall be
              resolved in good faith by the CEO of Corixa and the Senior Vice
              President and General Manager of SB, respectively.

         (b)  From the amounts specified in subparagraph 6(a) Corixa shall
              reinvest US [***] in the performance of the Research Program. In
              the event the amounts specified have not been dedicated fully to
              the Research Program, the Joint Research Team will decide how
              these amounts shall be allocated by Corixa to a further usage of
              the Research Program. On an annual basis, Corixa shall provide to
              the Joint Research Team a report in reasonable detail setting
              forth the use of funds provided by SB to Corixa under Section 6(a)
              of this Agreement.

11.      EQUITY. Simultaneous with execution of this Agreement, Corixa will
enter into good faith negotiations with SR One for the purchase by SR One of up
to two million, five hundred thousand dollars ($2,500,000.00) of Corixa's Series
B Preferred Stock.

12.      INVENTIONS. Patentable inventions or discoveries which arise from the
Research Program and which are made by an employee or agent of Corixa, solely or
jointly other than with an employee or agent of SB, shall be owned by Corixa.
Patentable inventions or discoveries which arise from the Research Program and
which are made jointly by employees or agents of Corixa and SB shall be jointly
owned by Corixa and SB and treated as joint inventions under the US laws
applicable to joint inventions (collectively, "Joint Inventions"). Patentable
inventions or discoveries which arise from the Research Program and which are
made by an employee or agent of SB, solely or jointly other than with an
employee or agent of Corixa, shall be owned by SB. Except as otherwise set forth
in this Agreement, SB and Corixa shall retain their respective unrestricted
rights to make, have made, use and sell all such inventions and discoveries
which are owned solely by them. In the event this Agreement is terminated as a
result of an uncured breach by SB under Section 20(c) hereof, without further
action on the part of either party, Corixa will receive a non-royalty-bearing
and exclusive license to all Joint Research Program Patents and Joint Inventions
in the Mtb field and Know-How associated therewith; such license shall in no
event include SB Patents. In such event, SB agrees to take all steps necessary
to effectuate such license to Corixa.

13.      PATENTS; PROSECUTION AND LITIGATION.

         (a)  Corixa shall have the right to prosecute and maintain all Corixa
              Patents and Joint Research Program Patents and shall do so in a
              timely manner. Corixa shall disclose to SB the complete texts of
              all patents and patent applications filed by Corixa which relate
              to any Product (including Corixa Patents) as well as all
              information received concerning the institution or possible
              institution of any interference, opposition, re-examination,
              reissue, revocation, nullification or any official proceeding
              involving any patent licensed herein anywhere in the



                                      -13-
<PAGE>   14

              Subterritory A. SB shall have the right to review all such pending
              applications and other proceedings and make recommendations to
              Corixa concerning them and their conduct. Corixa agrees to keep SB
              promptly and fully informed of the course of patent prosecution or
              other proceedings including by providing SB with copies of
              substantive communications, search reports and third party
              observations submitted to or received from patent offices
              throughout Subterritory A. Corixa shall provide such patent
              consultation to SB at no cost to SB. SB shall hold all information
              disclosed to it under this section as confidential.

         (b)  In the event Corixa intends to abandon any patent or any part of a
              patent (including Corixa Patents) covered by this Agreement, it
              shall notify SB and SB shall have the right to assume
              responsibility for any such patent or part of patent.

         (c)  In the event of the initiation of any suit by a third party
              against Corixa, SB or the Affiliates of either for patent
              infringement involving the manufacture, use, sale, distribution or
              marketing of any Product anywhere in Subterritory A, the party
              sued shall promptly notify the other party in writing. SB shall
              have the right but not the obligation to defend such suit at its
              own expense. Corixa and SB shall assist one another and cooperate
              in any such litigation at the other's request without expense to
              the requesting party.

         (d)  In the event that Corixa or SB becomes aware of actual or
              threatened infringement of a patent anywhere in Subterritory A,
              that party shall promptly notify the other party in writing. SB
              shall have the first right but not the obligation to bring, at its
              own expense, an infringement action against any third party and to
              use Corixa's name in connection therewith. If SB does not commence
              a particular infringement action within ninety (90) days, Corixa,
              after notifying SB in writing, shall be entitled to bring such
              infringement action at its own expense. The party conducting such
              action shall have full control over its conduct, including
              settlement thereof. In any event, Corixa and SB shall assist one
              another and cooperate in any such litigation at the other's
              request without expense to the requesting party.

         (e)  Corixa and SB shall recover their respective actual out-of-pocket
              expenses, or equitable proportions thereof, associated with any
              litigation or settlement thereof from any recovery made by any
              party. In the event SB takes responsibility for such actions, it
              shall bear [***] and Corixa shall bear the remaining [***]
              provided that Corixa's remaining share of the expenses do not
              exceed [***] of royalties owed to Corixa by SB. Any excess amount
              shall be shared between SB and Corixa, with SB receiving [***] and
              Corixa receiving [***] of such excess. In the event Corixa takes
              responsibility for such actions, Corixa will undertake all actions
              at its own entire expense, and recover [***].



                                      -14-
<PAGE>   15

         (f)  The parties shall keep one another informed of the status of their
              respective activities regarding any litigation or settlement
              thereof concerning any Product.

         (g)  DISCLAIMER OF WARRANTIES. CORIXA MAKES NO REPRESENTATIONS OR
              WARRANTIES, EXPRESS OR IMPLIED OTHER THAN THOSE CONTAINED IN
              SECTION 19 BELOW, WITH RESPECT TO THE CORIXA PATENTS, THE RESEARCH
              PROGRAM PATENTS OR KNOW-HOW, AND ANY PRODUCTS RELATED THERETO
              INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
              FITNESS FOR A PARTICULAR PURPOSE.

14.      CONFIDENTIALITY; PUBLICITY; PUBLICATIONS.

         (a)  During the term of this Agreement, Corixa shall promptly disclose
              to SB and/or supply SB in a timely fashion with all Know-How and
              all inventions related to Mtb arising from the Research Program.
              In addition, each party will provide the other party with all
              information which is necessary or useful for obtaining the goals
              of the Research Program. Corixa shall also provide SB with
              quarterly reports on the progress of the Research Program.

         (b)  During the term of this Agreement, each party shall promptly
              inform the other party of any information that it obtains or
              develops regarding the utility and safety of any Product(s) and
              shall promptly report to the other party any confirmed information
              of serious or unexpected reactions or side effects related to the
              utilization or medical administration of Product(s).

         (c)  During the term of this Agreement and for five (5) years
              thereafter, irrespective of any termination earlier than the
              expiration of the term of this Agreement, Corixa and SB shall not
              use or reveal or disclose to any third party any confidential
              information received from the other party or otherwise developed
              by either party in the performance of activities in furtherance of
              this Agreement without first obtaining the written consent of the
              disclosing party, except as may be otherwise provided herein, or
              as may be required for purposes of investigating, developing,
              manufacturing or marketing any Product or for securing essential
              or desirable authorizations, privileges or rights from
              governmental agencies, or is required to be disclosed to a
              governmental agency, or is necessary to file or prosecute patent
              applications concerning any Product or to carry out any litigation
              concerning any Product. This confidentiality obligation shall not
              apply to such information which is or becomes a matter of public
              knowledge, or is already in the possession of the receiving party,
              or is disclosed to the receiving party by a third party having the
              right to do so, or is subsequently and independently developed by
              employees of the receiving party or Affiliates thereof who had no
              knowledge of the confidential information disclosed. The parties
              shall take reasonable measures to assure that no unauthorized use
              or disclosure is made by others to whom access to such information
              is granted.

         (d)  Nothing herein shall be construed as preventing SB from disclosing
              any information received from Corixa to an Affiliate, sublicensee
              or distributor, provided such Affiliate, sublicensee or
              distributor has undertaken in writing a similar obligation of
              confidentiality with respect to the confidential information, with
              Corixa stated as a third party beneficiary thereof.


                                      -15-
<PAGE>   16

         (e)  All confidential information disclosed by one party to the other
              shall remain the intellectual property of the disclosing party. In
              the event that a court or other legal or administrative tribunal,
              directly or through an appointed master, trustee or receiver,
              assumes partial or complete control over the assets of a party to
              this Agreement based on the insolvency or bankruptcy of such
              party, the bankrupt or insolvent party shall promptly notify the
              court or other tribunal (1) that confidentiality of the other
              party's confidential information received from the other party
              under this Agreement remains the property of the other party and
              (2) of the confidentiality obligations under this Agreement. In
              addition, the bankrupt or insolvent party shall, to the extent
              permitted by law, take all steps necessary or desirable to
              maintain the confidential information and to insure that the
              court, other tribunal or appointee maintains such information in
              confidence in accordance with the terms of this Agreement.

         (f)  The parties to this Agreement may disclose the nature of the
              intended Agreement in a press release following signature,
              provided, however, that the terms of the Agreement are not
              disclosed by either party. The wording of any press release must
              be agreed to by both parties in advance of its release, provided
              that such agreement is not unreasonably withheld by either party.

         (g)  Neither party will publish or provide disclosure of information or
              inventions arising from the Research Program (a "Dissemination")
              without at least sixty (60) days prior written notice of such
              planned publication or disclosure. In the event any such
              Dissemination is determined by the other party to be detrimental
              to its intellectual property position, the disseminating party
              will delay such publication for a period sufficient to allow the
              other party to take the steps necessary to protect such
              intellectual property, including the filing of any patent
              applications, and/or deletion of its confidential information.

15.      GOVERNING LAW; ARBITRATION. This Agreement will be governed by the laws
of the State of Washington, USA. Any dispute, controversy or claim arising out
of or in relation to this Agreement or the breach, termination or invalidity
thereof, that cannot be settled amicably by agreement of the parties hereto,
shall be finally settled by arbitration in accordance with the arbitration rules
of the American Arbitration Association ("AAA"), then in force, by one or more
arbitrators appointed in accordance with said rules; provided, however, that
arbitration proceedings may not be instituted until the party alleging breach of
this Agreement by the other party has given the other party not less than sixty
(60) days notice to remedy any alleged breach and the other party has failed to
do so. The place of arbitration shall be Seattle, Washington, USA if arbitration
is initiated by SB and New York, New York if initiated by Corixa. The award
rendered shall be final and binding upon both parties. The judgment rendered by
the arbitrator shall include costs of arbitration, reasonable attorneys' fees
and reasonable costs for any expert and other witnesses. The arbitration in such
proceeding may expressly consider the amounts paid pursuant to Sections 6(a) and
6(b) hereof in considering any claim of damages. Nothing in this Agreement shall
be deemed as preventing either party from seeking injunctive relief (or any
other provisional remedy) from any court having jurisdiction over the parties
and the subject matter of the dispute as necessary to protect either party's
name, proprietary information, trade secrets, know-how or any other proprietary
rights. Judgment upon the award may be entered in any court


                                      -16-

<PAGE>   17
having jurisdiction, or application may be made to such court for judicial
acceptance of the award and/or an order of enforcement as the case may be.

16.      MISCELLANEOUS.

         (a)  TRADEMARK. SB shall be responsible for the selection, and SB shall
              be responsible for registration and maintenance, of all trademarks
              which are employed in connection with any Product or Combination
              Product and SB shall own and/or control any such trademarks;
              provided that prior to selection of such trademarks, SB shall
              provide Corixa an opportunity to review and comment on any such
              trademark.

         (b)  FORCE MAJEURE. If the performance of any part of this Agreement by
              either party, or of any obligation under this Agreement, is
              prevented, restricted, interfered with or delayed by reason of any
              cause beyond the reasonable control of the party liable to
              perform, unless conclusive evidence to the contrary is provided;
              the party so affected shall, upon giving written notice to the
              other party, be excused from such performance to the extent of
              such prevention, restriction, interference or delay, provided that
              the affected party shall use its reasonable best efforts to avoid
              or remove such causes of nonperformance and shall continue
              performance with the utmost dispatch whenever such causes are
              removed. When such circumstances arise, the parties shall discuss
              what, if any, modification of the terms of this Agreement may be
              required in order to arrive at an equitable solution.

         (c)  SEVERABILITY.

              (i)   In the event any portion of this Agreement shall be held
                    illegal, void or ineffective, the remaining portions hereof
                    shall remain in full force and effect;

              (ii)  If any of the terms or provisions of this Agreement are in
                    conflict with any applicable statute or rule of law, then
                    such terms or provisions shall be deemed inoperative to the
                    extent that they may conflict therewith and shall be deemed
                    to be modified to conform with such statute or rule of law.

         (d)  ENTIRE AGREEMENT. This Agreement, entered into a of the date
              written above, constitutes the entire agreement between the
              parties relating to the subject matter hereof and supersedes all
              previous writings and understandings except that the Non
              Disclosure Agreements between the parties dated 17 February 1995
              and 10 August 1995 remain in full force and effect. No terms or
              provisions of this Agreement shall be varied or modified by any
              prior or subsequent statement, conduct or act of either of the
              parties, except that the parties may mutually amend this Agreement
              by written instruments specifically referring to and executed in
              the same manner as this Agreement.


                                      -17-
<PAGE>   18
17.      NOTICES.

         (a)  Any notice required or permitted under this Agreement shall be
              sent by registered air mail, postage pre-paid, international cable
              or telex to the following addresses of the parties:

                        If to Corixa:
                        Corixa Corporation
                        1124 Columbia Street, Suite 464
                        Seattle, WA 98104
                        Attention:  President and Chief Executive Officer

                        If to SB:
                        SmithKline Beecham Biologicals s.a.
                        Rue de l'Institut 89
                        1330 Rixensart, Belgium
                        Attention:  Senior Vice President, General Manager

         (b)  Any notice required or permitted to be given concerning this
              Agreement shall be effective upon receipt by the party to whom it
              is addressed.

18.      ASSIGNMENT. This Agreement and the licenses herein granted shall be
binding upon and inure to the benefit of the successors in interest of the
respective parties. Neither this Agreement nor any interest hereunder shall be
assignable by either party without the written consent of the other provided,
however, that either party may assign this Agreement and all patents related to
this Agreement to an Affiliate or to any corporation or other entity with which
it may merge or consolidate, and/or to any corporation or other entity to which
it may transfer all or substantially all of its assets, without obtaining the
consent of the other party; provided that the consent of the non-transferring
party shall be required for any transfer of all or substantially all assets that
materially alters the rights of such non-transferring party under this Section.

19.      WARRANTIES AND REPRESENTATIONS.

         (a)  Each party warrants that it has the right to enter into this
              Agreement.



         (b)  Nothing in this Agreement shall be construed as a warranty that
              patents covered by this Agreement are valid or enforceable or that
              their exercise will not infringe any patent rights of third
              parties.

         (c)  Corixa acknowledges that in entering into this Agreement, SB has
              relied or will rely upon information supplied by Corixa, by
              Corixa's agents and/or representatives to SB pursuant to
              confidentiality agreements between the parties and pursuant to
              Section 14 hereof (all of such information being hereinafter
              referred to collectively as "Product Information") and Corixa
              warrants and represents that such Product Information has been
              accurate in all material respects.

         (d)  The parties warrant to one another that neither of them has any
              present knowledge of the existence of any pre-clinical or clinical
              data or information covering any


                                      -18-
<PAGE>   19
              Product which suggests that there may exist toxicity, safety
              and/or efficacy concerns which may materially impair the utility
              and/or safety of Product.

20.      TERM AND TERMINATION.

         (a)  In the event SB does not exercise its Option by the end of the
              Option Term, the Agreement will be terminated, except for the
              provisions of Sections 12, 14,15, 21(a) and 22. If this agreement
              is terminated by Corixa for breach by SB under Section 20(c)
              hereof, all rights to all intellectual property arising from the
              Research Program, including but not limited to Corixa Patents,
              Joint Research Program Patents and Know-How, but excluding SB
              Patents, shall, subject to the provisions of Section 12, revert to
              Corixa and SB shall retain no rights therein. All payments set
              forth in Paragraphs 6.(a) and 6.(b) will be guaranteed and
              non-refundable. Failure by Corixa to conduct the Research Program
              as detailed in Schedule 1 shall be considered a breach of
              Agreement and be subject to sub-paragraph 20(c) below and any
              amount previously paid by SB may be submitted for consideration in
              arbitration pursuant to Section 15.

         (b)  Unless otherwise terminated, in the event the Option is exercised
              by SB, this Agreement shall expire upon the expiration, lapse or
              invalidation of the last remaining Corixa Patent or Joint Research
              Program Patent licensed to SB by Corixa hereunder. Expiration of
              this Agreement under this provision shall not preclude SB from
              continuing to market Product and to use Know-How without any
              further royalty payments.

         (c)  If either party materially breaches the material provisions of
              this Agreement and if such breach is not cured within sixty (60)
              days after receiving written notice from the other party with
              respect to such breach, the non-breaching party shall have the
              right to terminate this Agreement by giving written notice to the
              party in breach provided the notice of termination is given within
              six (6) months of the breach and prior to cure thereof.


   
         (d)  As set forth in Section 4(a) above, SB agrees it will exercise at
              least the same level of diligence in the clinical development and
              commercialization of Product within Subterritory A as it currently
              uses, or in the past has used, with respect to its own
              commercially successful products. However, prior to marketing
              Product in any given country, SB may terminate its development
              efforts and the license granted hereunder with respect to that
              Product and country upon one hundred eighty (180) days notice if
              in SB's reasonable judgment sales in such country would not be
              commercially viable. Thereafter, after beginning Product marketing
              efforts in any particular country, and continuing such efforts for
              three (3) or more years (the "Minimum Diligence Period"), SB may
              terminate sales efforts with respect to any single country by
              giving Corixa at least six (6) months prior written notice
              thereof. Such Minimum Diligence Period may be reduced below three
              (3) years by mutual agreement of the parties.
    

         (e)  Either party may terminate this Agreement if, at any time, the
              other party shall file in any court or agency pursuant to any
              statute or regulation of the United States or

                                      -19-
<PAGE>   20
              of any individual state or foreign country, a petition in
              bankruptcy or insolvency or for reorganization or for an
              arrangement or for the appointment of a receiver of trustee of the
              party or of its assets, or if the other party proposes a written
              agreement of composition or extension of its debts, or if the
              other party shall be served with an involuntary petition against
              it, filed in any insolvency proceeding, and such petition shall
              not be dismissed with sixty (60) days after the filing thereof, or
              if the other party shall propose or be a party to any dissolution
              or liquidation, or if the other party shall make an assignment for
              the benefit of creditors.

         (f)  Notwithstanding the bankruptcy of Corixa, or the impairment of
              performance by Corixa of its obligations under this Agreement as a
              result of bankruptcy or insolvency of Corixa, SB shall be entitled
              to retain the rights and licenses granted herein, without any
              farther obligations to Corixa, subject to Corixa's right to
              terminate this Agreement for reasons other than bankruptcy or
              insolvency as expressly provided in this Agreement.

21.      RIGHTS AND DUTIES UPON TERMINATION.

         (a)  Upon termination of this Agreement, Corixa shall have the right to
              retain any sums already paid by SB hereunder, and SB shall pay all
              sums accrued hereunder which are then due, which, in each case,
              shall include all payments under 6(a) except to the extent such
              payments may be considered and reviewed by the arbitrator pursuant
              to Section 15 hereof.

         (b)  Upon termination of this Agreement, SB shall notify Corixa of the
              amount of any Product SB and its subsidiaries and distributors
              then have on hand, the sale of which would, but for the
              termination, be subject to royalty, and SB and its sublicensces
              and distributors shall thereupon be permitted to sell that amount
              of any Product, provided that SB shall pay the royalty thereon at
              the time herein provided for.

22.      INDEMNIFICATION.

         (a)  Subject to Section 22(b) hereof, from and after the Effective
              Date, except as otherwise herein specifically provided, each of
              the parties hereto shall defend, indemnify and hold harmless the
              other party and its Affiliates, successors and assigns, and their
              respective officers, directors, shareholders, partners and
              employees from and against all losses, damage, liability arid
              expense including legal fees but excluding punitive or
              consequential damages (including lost profits) ("Damages")
              incurred thereby or caused thereto arising out of or relating to
              (i) any breach or violation of, or failure to properly perform,
              any covenant or agreement made by such indemnifying party in this
              Agreement, unless waived in writing by the indemnified party; (ii)
              any breach of any of the representations or warranties made by
              such indemnifying party in this Agreement; or (iii) the gross
              negligence or willful misconduct of the indemnifying party.

         (b)  If either SB or Corixa, or any Affiliate of SB or Corixa (in each
              case an "Indemnified Party"), receives any written claim which it
              believes is the subject of indemnity hereunder by either SB or
              Corixa, as the case may be (in each case an


                                      -20-
<PAGE>   21
              "Indemnifying Party"), the Indemnified Party shall, as soon as
              reasonably practicable after forming such belief, give notice
              thereof to the Indemnifying Party, including full particulars of
              such claim to the extent known to the Indemnified Party; provided,
              however, that the failure to give timely notice to the
              Indemnifying Party as contemplated hereby shall not release the
              Indemnifying Party from any liability to the Indemnified Party.
              The Indemnifying Party shall have the right, by prompt notice to
              the Indemnified Party, to assume the defense of such claim with
              counsel reasonably satisfactory to the Indemnified Party, and at
              the cost of the Indemnifying Party. If the Indemnifying Party does
              not so assume the defense of such claim, the Indemnified Party may
              assume such defense with counsel of its choice at the sole expense
              of the Indemnifying Party. If the Indemnifying Party so assumes
              such defense, the Indemnified Party may participate therein
              through counsel of its choice, but the cost of such counsel shall
              be borne solely by the Indemnified Party.

         (c)  The party not assuming the defense of any such claim shall render
              all reasonable assistance to the party assuming such defense, and
              all out-of-pocket costs of such assistance shall be borne solely
              by the Indemnifying Party.

         (d)  No such claim shall be settled other than by the party defending
              the same, and then only with the consent of the other party, which
              shall not be unreasonably withheld; provided, however, that the
              Indemnified Party shall have no obligation to consent to any
              settlement of any such claim which imposes on the Indemnified 
              Party any liability or obligation which cannot be assumed and
              performed in full by the Indemnifying Party.

         IN WITNESS WHEREOF, each of the parties hereto has caused this
Agreement to be executed by its duly authorized officer as of the date first
written above.

Agreed to and accepted by:             Agreed to and accepted by:
CORIXA CORPORATION                     SMITHKLINE BEECHAM BIOLOGICALS S.A.


/s/ STEVEN GILLIS                      /s/ JEAN STEPHENNE
- -------------------------------        -----------------------------------------
Steven Gillis                          Jean Stephenne
President and CEO                      Senior Vice President and General Manager

attachment: Schedule 1






                                      -21-
<PAGE>   22



                                   SCHEDULE 1
 
                                     [***]


                                      -22-



<PAGE>   1
                                                                   EXHIBIT 10.11

                                OPTION AGREEMENT

        This OPTION AGREEMENT (together with the exhibits hereto the
"Agreement") is entered into the 1st day of March, 1997 (the "Effective Date")
by and between CORIXA CORPORATION, a Delaware corporation with its principal
place of business located at 1124 Columbia Street, Suite 200, Seattle,
Washington 98104 ("Corixa") and SmithKline Beecham Biologicals Manufacturing
S.A., a Belgian corporation with its principal place of business at Rue de
l'Institut 89, B-1330 Rixensart, Belgium ("SB").

                              W I T N E S S E T H:

        WHEREAS, Corixa and SB are parties to a Prostate Cancer Collaboration
and License Agreement (the "Prostate Cancer Agreement") and a Breast Cancer
Collaboration and License Agreement (the "Breast Cancer Agreement") both of even
date herewith (each, the "Collaboration Agreement") whereby the parties have
agreed to collaborate in the research, development and license of antigens for
vaccine products for the prevention and/or treatment of prostate and breast
cancers, respectively;

        WHEREAS, SB desires to acquire from Corixa an option to enter into
additional agreements for antigens for vaccine products for the prevention
and/or treatment of [***] and/or [***] cancers that take the form of the
Collaboration Agreements with appropriate revisions to reflect a modification of
the subject matter to cover [***] and/or [***] cancers.

        NOW, THEREFORE, for and in consideration of the mutual observance of the
covenants hereinafter set forth and other good and valuable consideration, the
receipt of which is hereby acknowledged, the parties hereto agree as follows:

        1. DEFINITIONS

                                                                                
                                                                                
                "[***] Collaboration Agreement" shall have the meaning assigned
thereto in Section 2(a).

                "[***] Field" shall mean any and all in vivo administered
prophylactic and/or therapeutic [***] cancer Vaccines (as defined in the
Collaboration Agreements) for use in humans.

                "[***] Option" means the option granted by Corixa to SB pursuant
to Section 2 hereof.

                "[***] Option Period" means the period commencing on the
Effective Date and continuing until [***] following the Effective Date, as such
[***] Option Period may be extended pursuant to Section 2(c) hereof.

                "National Exchange" shall mean the Nasdaq National Market or any
other national exchange on which the Common Stock of Corixa is listed.



                                       1
<PAGE>   2

                "[***] Collaboration Agreement" shall have the meaning
assigned thereto in Section 3(a).

                "[***] Field" shall mean any and all in vivo administered
prophylactic and/or therapeutic [***] cancer Vaccines as defined in the
Collaboration Agreement for use in humans.

                "[***] Option" means the option granted by Corixa to SB
pursuant to Section 3 hereof.

                "[***] Option Period" means the period commencing on the
Effective Date and continuing until [***] following the Effective Date, as such
[***] Option Period may be extended pursuant to Section 3(c) hereof.

        2. GRANT OF OPTION FOR [***] FIELD

                (a) Grant of Option

                Subject to the provisions of this Agreement, Corixa hereby
grants to SB an option, exercisable during the [***] Option Period, to enter
into a collaboration and license agreement to cover the [***] Field (the "[***]
Option"), on substantially the same terms and conditions set forth in the
Collaboration Agreement; provided, that the parties acknowledge and agree that
the amounts allocated to research funding and other modifications that reflect
the nature of the disease target may be required (the "[***] Collaboration
Agreement"). SB may exercise the [***] Option at any time on or before the
expiration of the [***] Option Period (i) by providing written notice of
exercise to Corixa prior to the expiration of the [***] Option Period, and (ii)
paying to Corixa a lump sum payment of [***] by wire transfer of immediately
available funds, which payment shall be subject to credit or conversion as set
forth in Section 4 below; provided, however, that Corixa may begin discussing
possible collaborations with parties other than SB at any time after [***]
Option Period; such discussions shall be terminated forthwith by Corixa if and
when SB exercises the [***] Option or extends the [***] Option Period pursuant
to Section 2(c) hereof.

                (b) Initial Option Fee

                Upon execution and delivery of this Agreement, SB shall pay to
Corixa a lump sum payment of [***] by wire transfer of immediately available
funds, which payment shall be subject to credit, conversion or repayment as set
forth in Section 4 below.

                (c) Extension of the Option Period

   
                SB will have the right to extend the [***] Option Period for
one (1) additional twelve (12) month period by (i) providing written notice to
Corixa of  
    



                                       2

<PAGE>   3
SB's intention to extend the [***] Option Period prior to the expiration of the
initial [***] Option Period, and (ii) making the payment set forth in Section
2(d) below.

                (d) Option Extension Fee

                If SB elects to extend the [***] Option Period pursuant to
Section 2(c) above, on or before the expiration of the initial [***] Option
Period, SB shall pay to Corixa a lump sum payment of [***] by wire transfer of
immediately available funds, which payment shall be subject to credit,
conversion or repayment as set forth in Section 4 below.

        3. GRANT OF OPTION FOR [***] FIELD

                (a) Grant of Option

                Subject to the provisions of this Agreement, Corixa hereby
grants to SB an option, exercisable during the [***] Option Period, to enter
into a collaboration and license agreement to cover the [***] Field (the "[***]
Option"), on substantially the same terms and conditions set forth in the
Collaboration Agreement, provided, that the parties acknowledge and agree that
the amounts allocated to research funding and other modifications that reflect
the nature of the disease target may be required (the "[***] Collaboration
Agreement"). SB may exercise the [***] Option at any time on or before the
expiration of the [***] Option Period (i) by providing written notice of
exercise to Corixa prior to the expiration of the [***] Option Period and (b)
paying to Corixa a lump sum payment of [***] by wire transfer of immediately
available funds, which payment shall be subject to credit or conversion as set
forth in Section 4 below; provided, however, that Corixa may begin discussing
possible collaborations with parties other than SB at any time after [***]
Option Period. Said discussions shall be terminated forthwith by Corixa if and
when SB exercises the [***] Option or extends the [***] Option Period pursuant
to Section 3(c) hereof.

                (b) Initial Option Fee

                Upon execution and delivery of this Agreement, SB shall pay to
Corixa a lump sum payment of [***] by wire transfer of immediately available
funds, which payment shall be subject to credit, conversion or repayment as set
forth in Section 4 below.

                (c) Extension of the Option Period
                                                                                
   
                SB will have the right to extend the [***] Option Period for one
(1) additional eighteen (18) month period by (i) providing written notice to
Corixa of SB's intention to extend the initial [***] Option Period prior to the
expiration of the initial [***] Option Period, and (ii) making the payment set
forth in Section 3(d) below.
    



                                      3


<PAGE>   4

                (d) Option Extension Fee

                If SB elects to extend the [***] Option Period pursuant to
Section 3(c) above, on or before the expiration of the initial [***] Option
Period, SB shall pay to Corixa a lump sum payment of [***] by wire transfer of
immediately available funds, which payment shall be subject to credit,
conversion or repayment as set forth in Section 4 below.

        4. OPTION PAYMENTS. All payments made by SB to Corixa pursuant to
Sections 2 and 3 above shall be subject to the following terms and conditions:

   
                (a) [***] Option Payments. If SB exercises the [***] Option,
then all payments made by SB to Corixa pursuant to Section 2 shall be, at the
election of SB, either (i) credited against future milestones in the [***]
Collaboration Agreement in accordance with Section 4(c) below or (ii) if
Corixa's Common Stock is listed on a National Exchange and Corixa has a market
capitalization of not less than US$128 million (assuming exercise or conversion
of all outstanding options, warrants and other securities exercisable for or
convertible into Corixa's Common Stock), converted into Corixa's Common Stock in
accordance with Section 4(d) below. If SB does not exercise the [***] Option,
then all payments made by SB to Corixa pursuant to Section 2 shall be repaid by
Corixa in accordance with Section 4(e) below.
    

                (b) [***] Option Payments. If SB exercises the [***] Option,
then all payments made by SB to Corixa pursuant to Section 3 shall be, at the
election of SB, either (i) credited against future milestones in the [***]
Collaboration Agreement in accordance with Section 4(c) below or (ii) if
Corixa's Common Stock is listed on a National Exchange and Corixa has a market
capitalization of not less than [***] (assuming exercise or conversion of all
outstanding options, warrants and other securities exercisable for or
convertible into Corixa's Common Stock), converted into shares of Corixa's
Common Stock in accordance with Section 4(d) below. If SB does not exercise the
[***] Option, then all payments made by SB to Corixa pursuant to Section 3 shall
be repaid by Corixa in accordance with Section 4(e) below.

                (c) Credit Against Milestones. From and after receipt of written
notice from SB to Corixa (the "Credit Notice") of SB's intent to credit payments
made by it pursuant to Section 2 and/or Section 3 of this Agreement, as
applicable (the "Credit Amount"), which Credit Notice shall be made within
fifteen (15) days of the exercise of the [***] Option and/or the [***] Option,
as applicable, Corixa shall repay the Credit Amount by applying such Credit
Amount against future milestones that become payable by SB to Corixa in
accordance with the terms of the [***] Collaboration Agreement and/or the [***]
Collaboration Agreement, as applicable, during the period beginning the date of
the Credit Notice(s) and ending on [***] of the Credit Notice(s). On [***] of
the Credit Notice, Corixa shall pay to SB the balance, if any, of the Credit
Amount not credited against such milestones pursuant to this Section 4(c).
However, the entire Credit Amount or any portion thereof may be prepaid by
Corixa at any time in its sole discretion.



                                       4

<PAGE>   5

   
                (d) Conversion to Common Stock. Within thirty (30) days (the
"Conversion Date") following the Corixa's receipt of a written notice from SB
(the "Conversion Notice Date") of SB's intent to convert payments made by it
pursuant to Section 2 and/or Section 3 of this Agreement as applicable into
shares of Corixa's Common Stock, (the "Conversion Amount"), Corixa shall issue
to SB the number of shares of Corixa's Common Stock equal to the Conversion
Amount divided by the "Common Stock Price." For purposes of this Section 4(d),
the "Common Stock Price" shall equal 111.25% of the average closing price for
Corixa's Common Stock during the period beginning six (6) trading days prior to
the Conversion Notice Date and ending on the trading day prior to the date of
the Conversion Notice Date, as reported on the National Exchange.
    

                (e) Repayment. Within thirty (30) days following expiration of
the [***] Option Period, or the [***] Option Period, as the case may be (the
"Note Issuance Date"), to the extent SB has not exercised the [***] Option, or
the [***] Option, as applicable, Corixa shall issue to SB an interest-free
promissory note in principal amount equal to the payments made by SB pursuant to
Section 2 in the case of the [***] Option and Section 3 in the case of the
[***] Option, which will not bear interest, payable in three (3) equal annual
payments on the third, fourth and fifth anniversaries of the date of this
Agreement

        5. MISCELLANEOUS

                (a) Development Efforts. Upon exercise of the [***] Option
and/or [***] Option, the parties will collaborate in the discovery and
development of Antigens for use in Vaccine(s) for the prevention and/or
treatment of [***] cancer and/or [***] cancer, as applicable, by using
commercially reasonable efforts to conduct the activities set forth in a
research program plan to be prepared in good faith jointly by the parties as
soon as practicable after the exercise of the [***] Option and/or [***]
Option.

                (b) Entire Agreement. This Agreement, entered into as of the
date written above, constitutes the entire agreement between the parties
relating to the subject matter hereof and supersedes all previous writings and
understandings, except that the Non Disclosure Agreements dated 17 February 1995
and 10 August 1995, the Tuberculosis Collaboration and License Agreement dated
October 6, 1995 between Corixa Corporation and SmithKline Beecham Biologicals
S.A., the Prostate Cancer Collaboration and License Agreement of even date
herewith and the Breast Cancer Collaboration and License Agreement of even date
herewith remain in full force and effect. No terms or provisions of this
Agreement shall be varied or modified by any prior or subsequent statement,
conduct or act of either of the parties, except that the parties may mutually
amend this Agreement by written instruments specifically referring to and
executed in the same manner as this Agreement.

                (c) Notices. Any notice required or permitted under this
Agreement shall be deemed given if delivered (i) personally, (ii) by facsimile
transmission (receipt verified), (iii) by registered or certified mail (return
receipt requested), postage prepaid, or 



                                       5

<PAGE>   6

arbitration in accordance with the arbitration rules of the American Arbitration
Association ("AAA"), then in force, by one or more arbitrators appointed in
accordance with said rules; provided that the appointed arbitrators shall have
appropriate experience in the bio-pharmaceutical industry; provided further,
however, that arbitration proceedings may not be instituted until the party
alleging breach of this Agreement by the other party has given the other party
not less than sixty (60) days notice to remedy any alleged breach and the other
party has failed to do so. The place of arbitration shall be Seattle,
Washington, USA if arbitration is initiated by SB and New York, New York if
initiated by Corixa. The award rendered shall be final and binding upon both
parties. The judgment rendered by the arbitrator shall include costs of
arbitration, reasonable attorneys' fees and reasonable costs for any expert and
other witnesses. The arbitration in such proceeding may expressly consider the
amounts paid pursuant to Sections 2 and 3 hereof in considering any claim of
damages. Nothing in this Agreement shall be deemed as preventing either party
from seeking injunctive relief (or any other provisional remedy) from any court
having jurisdiction over the parties and the subject matter of the dispute as
necessary to protect either party's name, proprietary information, trade
secrets, know-how or any other proprietary rights. Judgment upon the award may
be entered in any court having jurisdiction, or application may be made to such
court for judicial acceptance of the award and/or an order of enforcement as the
case may be.

                (f) Severability; Waiver If any provision of this Agreement is
finally held to be invalid, illegal or unenforceable by a court of competent
jurisdiction, the validity, legality and enforceability of the remaining
provisions shall not be affected or impaired in any way. Any delay in enforcing
a party's rights under this Agreement or any waiver as to a particular default
or other matter shall not constitute a waiver of a party's right to the future
enforcement of its rights under this Agreement.

               (g)    [Intentionally omitted.]



                                       7

<PAGE>   7

        IN WITNESS WHEREOF, each of the parties hereto has caused this Agreement
to be executed by its duly authorized officer as of the date first written
above.

Agreed to and accepted by:            Agreed to and accepted by:
CORIXA CORPORATION                    SMITHKLINE BEECHAM BIOLOGICALS
                                      MANUFACTURING S.A.


/s/  Steven Gillis                    /s/  Jean Stephenne
- --------------------------            ------------------------------------------
Steven Gillis                         Jean Stephenne
President and CEO                     Senior Vice President and General Manager



                                       8


<PAGE>   1
                                                                   EXHIBIT 10.13












                        BREAST CANCER COLLABORATION AND
                               LICENSE AGREEMENT


                                    BETWEEN


                               CORIXA CORPORATION


                                      AND


               SMITHKLINE BEECHAM BIOLOGICALS MANUFACTURING S.A.






































                                      -1-
<PAGE>   2
                               TABLE OF CONTENTS

<TABLE>
<S>                                                                                                 <C>
1.   DEFINITIONS                                                                                     3
2.   SCOPE OF RESEARCH PROGRAM                                                                       8
3.   RESEARCH PROGRAM TERM AND TERMINATION                                                           8
4.   LICENSE GRANT                                                                                   9
5.   LICENSE PAYMENTS                                                                               10
6.   ROYALTIES                                                                                      12
7.   OTHER TERMS                                                                                    15
8.   JOINT RESEARCH TEAM                                                                            15
9.   INVENTIONS                                                                                     16
10.  PATENTS; PROSECUTION AND LITIGATION                                                            16
11.  CONFIDENTIALITY; PUBLICITY; PUBLICATIONS                                                       18
12.  GOVERNING LAW; ARBITRATION                                                                     20
13.  MISCELLANEOUS                                                                                  21
14.  NOTICES                                                                                        22
15.  ASSIGNMENT                                                                                     22
16.  WARRANTIES AND REPRESENTATIONS                                                                 23
17.  TERM AND TERMINATION                                                                           23
18.  RIGHTS AND DUTIES UPON TERMINATION                                                             25
19.  INDEMNIFICATION                                                                                25

EXHIBIT A                                                                                           27
EXHIBIT B                                                                                           28
EXHIBIT C                                                                                           30
EXHIBIT D                                                                                           31
</TABLE>

















                                      -2-
<PAGE>   3
               BREAST CANCER COLLABORATION AND LICENSE AGREEMENT


This BREAST CANCER COLLABORATION AND LICENSE AGREEMENT (together, with the
attachments hereto, the "Agreement") is entered into the ______ day of March,
1997 (the "Effective Date") by and between CORIXA CORPORATION, a Delaware
corporation with its principal place of business located at 1124 Columbia
Street, Suite 464, Seattle, Washington 98104 ("Corixa") and SmithKline Beecham
Biologicals Manufacturing S.A., a Belgian corporation with its principal place
of business at Rue de l'Institut 89, B-1330 Rixensart, Belgium ("SB").

W I T N E S S E T H:

         WHEREAS, Corixa and SB desire to collaborate in the research and
development of antigens for the development of Vaccine product(s) for the
prevention and/or treatment of any form of  breast cancer and wish to
memorialize their agreement with respect to such collaboration in this
Agreement;

         WHEREAS, Corixa has agreed to license certain intellectual property
rights related to the subject matter of the collaboration subject to the terms
and conditions of this Agreement;

         NOW, THEREFORE, for and in consideration of the mutual observance of
the covenants hereinafter set forth and other good and valuable consideration,
the receipt of which is hereby acknowledged, the parties hereto agree as
follows:

1.       DEFINITIONS

         (a)     "Affiliate" shall mean any entity owned, owning or under
                 common ownership with a party to this Agreement to the extent
                 of at least fifty percent (50%) of the equity (or such lesser
                 percentage which is the maximum allowed to be owned by a
                 foreign corporation in a particular jurisdiction) having the
                 power to vote on or direct the affairs of the entity and any
                 person, firm, partnership, corporation or other entity
                 actually controlled by, controlling or under common control
                 with a party to this Agreement.

         (b)     "Antigens" shall mean (i) antigens and/or (ii) [***]

         (c)     "BC" shall mean breast cancer.

         (d)     "BC Field" shall mean any and all in vivo administered
                 prophylactic and/or therapeutic breast cancer Vaccines for use
                 in humans.

         (e)     "Blocking Patents" shall mean any patents and/or patent
                 applications owned and/or controlled by Third Parties having
                 claims which would be infringed by SB making, having made,
                 using, having used, offering for sale, selling or having sold
                 all or part of



                                      -3-
<PAGE>   4
                 Product and which would prevent SB from using the intellectual
                 property rights granted to SB by Corixa hereunder.

         (f)     "Competition" shall mean a product which would otherwise
                 infringe Corixa Patents or Joint Research Program Patents.

         (g)     "Corixa" shall mean Corixa Corporation and its Affiliates.

   
         (h)     "Corixa Antigens" shall mean (i) those Antigens identified on
                 Exhibit A attached hereto and/or (ii) those Antigens solely
                 discovered by Corixa during the Research Program Term as may be
                 extended in connection with and as a result of the Research
                 Program and/or (iii) those Antigens discovered by Corixa as a
                 result of research directed to BC during the Research Program
                 Term as may be extended but not in connection with and not as a
                 result of the Research Program and, subject to SB's exercize of
                 the option set forth in Paragraph 4(d) below, during a period
                 of two (2) years after the Research Program Term as may be
                 extended and/or (iv) subject to SB's compliance with the terms
                 and conditions of Paragraph 4(c) below, those Antigens in the
                 BC Field licensed-in or otherwise acquired by Corixa during the
                 Research Program Term as may be extended and, subject to
                 Paragraph 4(d) below, during a period of two (2) years
                 thereafter.  As used herein, Corixa Antigens shall not include
                 Research Program Antigens nor SB Antigens.
    

   
         (i)     "Corixa Patents" shall mean all patents and patent applications
                 (including those arising from the Research Program) which are
                 now or become owned and/or controlled by Corixa during the
                 Research Program Term as may be extended and, subject to
                 Paragraph 4(d) below, during a period of two (2) years
                 thereafter and/or under which Corixa otherwise has, now or in
                 the future, the right to grant licenses, which generically or
                 specifically claim all or part of Product(s), a process for
                 manufacturing Product(s), intermediates used in such process or
                 a use of Product and any and all technology(ies) generated
                 solely by Corixa in connection with Corixa's performance under
                 this Agreement during the Research Program Term as may be
                 extended and, subject to Paragraph 4(d) below, during a period
                 of two (2) years thereafter.  Included with the definition of
                 Corixa Patents are any continuations, continuations-in-part,
                 divisions, patents of addition, reissues, renewals or
                 extensions thereof.  Also included within the definition of
                 Corixa Patents are any patent applications which generically or
                 specifically claim any improvements on Product or intermediates
                 or manufacturing processes required or useful for production of
                 Product which are developed by Corixa, or which Corixa
                 otherwise has the right to grant licenses, now or in the future
                 during the Research Program Term as may be extended and,
                 subject to Paragraph 4(d) below, during a period of two (2)
                 years thereafter. Corixa Patents shall specifically not include
                 SB Patents. Corixa Patents in existence as of the Effective
                 Date are set forth on Exhibit B attached hereto. Exhibit B also
                 sets forth a list of patents owned and/or controlled by Corixa
                 which are specifically excluded from the scope of Corixa
                 Patents and shall not be considered Corixa Patents for the
                 purpose of this Agreement and to which SB shall have no rights
                 except as separately agreed by the parties in a written
                 separate agreement.
    

         (j)     "Identified" shall mean that the Know-How is described or
                 recorded in such a manner as to make it possible to verify
                 that it fulfills the criteria of secrecy and substantiality
                 and to





                                      -4-
<PAGE>   5
                 ensure that SB is not unduly restricted in its exploitation of
                 its own technology.  To be Identified the Know-How can either
                 be set out in this Agreement or in a separate document or
                 recorded in any other appropriate form at the latest when the
                 Know-How is transferred or shortly thereafter, provided that
                 the separate document or other record can be made available if
                 the need arises.

         (k)     "Joint Inventions" shall have the meaning set forth in 
                 Section 9.

         (l)     "Joint Research Program Patents" shall mean all patents and
                 patent applications which cover Joint Inventions and which
                 generically or specifically claim Product, a process for
                 manufacturing Product, and intermediates used in such process
                 or a use of Product and any and all technology(ies) generated
                 during the Research Program Term as may be extended.  Included
                 with the definition of  Joint Research Program Patents are any
                 continuations, continuations-in-part, divisions, patents of
                 addition, reissues, renewals or extensions thereof.  Also
                 included within the definition of Joint Research Program
                 Patents are any patent applications which cover Joint
                 Inventions and which generically or specifically claim any
                 improvements on Product or intermediates or manufacturing
                 processes required or useful for production of Product.  In no
                 event shall Joint Research Program Patents be deemed to
                 include Corixa Patents or SB Patents.

         (m)     "Joint Research Team" shall have the meaning set forth in
                 Paragraph 8(a).

         (n)     "Know-How" shall mean all technical information, materials and
                 know-how owned and/or controlled by Corixa now and/or during
                 the term of the Research Program Term as may be extended and,
                 subject to SB's exercize of the option set forth in Paragraph
                 4(d) below, during a period of two (2) years thereafter, which
                 directly relates to Product and shall include, without
                 limitation, all chemical, pharmacological, toxicological,
                 clinical, assay, control and manufacturing data and any other
                 information relating to Products and useful for the
                 development and commercialization of Products and strains,
                 samples, analytical tools, libraries, clones, etc.

         (o)     "Licensed Field" shall mean any and all in vivo administered
                 [***] cancer Vaccines for use [***] and shall [***] adoptive 
                 immunotherapy.

         (p)     "Milestone" shall mean the technical milestone set forth in
                 Exhibit C attached hereto, the satisfaction of which shall be
                 reasonably determined by the Joint Research Team within ten
                 (10) days of submission of the relevant information and data
                 by Corixa to the Joint Research Team.

         (q)     "Net Sales"

                  (i)      For purposes of this Agreement, Net Sales shall be
                           defined to mean the aggregate amounts invoiced by SB
                           or its Affiliates, licensees or sublicensees to
                           non-Affiliate Third Parties from sales of Product
                           less (i) normal customary trade discounts allowed and
                           taken; (ii) rebates to wholesalers; (iii) returns;
                           (iv) amounts for transportation including insurance;
                           (v) shipping charges to purchasers if invoiced
                           separately; (vi) taxes (not including any income
                           taxes), and duties levied on sales;



                                      -5-
<PAGE>   6
                           (vii) deduction allowed for government-mandated
                           vaccine insurance premiums, such as the National
                           Childhood Vaccine Injury Act in the U.S.; (viii) a
                           deduction, at standard cost, for special
                           administration devices and the packaging and filling
                           thereof, such as pre-filled syringes; provided, in no
                           event shall the total of items (iii) through (vi)
                           exceed [***] of Net Sales.  Any commercial use of a
                           Product by SB (including its Affiliates, licensees
                           and sub licensees) shall be considered a sale
                           hereunder for accounting and royalty purposes.

                 (ii)     In determining royalty payments hereunder, Net Sales
                          of Product shall be multiplied by [***].

                 (iii)    In the event of a product incorporating a Product and
                          one or more non-breast cancer Vaccines (a
                          "Combination Product"), Net Sales shall exclude [***].

         (r)     "Product" shall mean any product comprised at least of one (1)
                 or more Corixa Antigens and/or Research Program Antigens,
                 including any combination thereof.  In addition to Corixa
                 Antigens and/or Research Program Antigens Product may also
                 include SB Antigen(s).

         (s)     "Research Program" shall have the meaning set forth in
                 Paragraph 2(a).

         (t)     "Research Program Antigens" shall mean Antigens discovered by
                 Corixa and SB during the Research Program Term, as may be
                 extended, in connection with and as a result of the conduct of
                 the Research Program.

         (u)     "Research Program Term" shall have the meaning set forth in
                 Paragraph 3(a).

         (v)     "SB" shall mean SmithKline Beecham Biologicals Manufacturing
                 S.A. and its Affiliates.

         (w)     "SB Antigens" shall mean Antigens discovered and/or
                 in-licensed by SB and related physical forms based on such
                 Antigens including peptides, proteins and nucleic acids other
                 than Research Program Antigens.

         (x)     "SB Patents" shall mean all patents and patent applications
                 which are now or become owned and/or controlled by SB (other
                 than jointly with Corixa) and/or under which SB
                 otherwise has, now or in the future, the right to grant
                 licenses, which generically or specifically claim any Antigen
                 and/or adjuvant included in Product.  Included with the
                 definition of SB Patents are any continuations,
                 continuations-in-part, divisions, patents of


                                      -6-
<PAGE>   7
                 addition, reissues, renewals or extensions thereof.  In no
                 event shall SB Patents be deemed to include either Corixa
                 Patents or Joint Research Program Patents.

         (y)     "Secret" shall mean that the Know-How as a body or in the
                 precise configuration and assembly of its components is not
                 generally known or easily accessible, so that part of its
                 value consists in the lead-time SB gains when it is
                 communicated to it; Know-How is not limited to the narrow
                 sense that each individual component of the Know-How should be
                 totally unknown or unobtainable outside the Corixa's business.

         (z)     "SPC" shall mean all Supplementary Protection Certificates for
                 medicinal products and their equivalents provided under the
                 Council Regulation (EEC) N# 1768/92 of June 18, 1992.

         (aa)    "Substantial" shall mean that the Know-How includes
                 information which is of importance for the whole or a
                 significant part of (i) a manufacturing process or (ii) a
                 product or service, or (iii) for the development thereof and
                 excludes information which is trivial.  Such Know-How must
                 thus be useful, i.e., can reasonably be expected at the date
                 of conclusion of the Agreement to be capable of improving the
                 competitive position of SB, for example by helping SB to enter
                 a new market or giving SB an advantage in competition with
                 other manufacturers or providers of services who do not have
                 access to the licensed Secret Know- How or other comparable
                 Secret know-how;

         (bb)    "Territory" shall mean all the countries of the world.

         (cc)    "Third Party(ies) shall mean any party other than a party to
                 this Agreement or an Affiliate.

         (dd)    "Vaccines" shall mean the administration of [***] in any
                 formulation or configuration, for the primary purpose and
                 effect of eliciting a [***] or [***] immune response directed
                 directly or indirectly to such Antigen or one or more epitopes
                 contained therein.  [***]

         "Interpretive Rules". For purposes of this Agreement, except as
         otherwise expressly provided herein or unless the context otherwise
         requires : (a) defined terms include the plural as well as the singular
         and the use of any gender shall be deemed to include the other gender;
         (b) references to "Articles", "Sections" and other subdivisions and to
         "Schedules" and "Exhibits" without reference to a document, are to
         designated Articles, Sections and other subdivisions of, and to
         Schedules and Exhibits to, this Agreement; (c) the use of the term
         "including" means "including but not limited to"; and (d) the words
         "herein", "hereof", "hereunder" and other words of similar import refer
         to this Agreement as a whole and not to any particular provision.





                                      -7-
<PAGE>   8
2.       SCOPE OF RESEARCH PROGRAM

         (a)     During the Research Program Term, the parties will collaborate
                 in the discovery and development of Antigens for use in
                 Vaccine(s) for the prevention and/or treatment of BC and any
                 other tumor type in the Licensed Field to the extent those
                 Antigens are useful for such tumor types. The program of
                 activities to be conducted by Corixa and SB during the term of
                 the Agreement is set forth in Exhibit D (the "Research
                 Program").  No material deviation in the subject matter and
                 scope of such Research Program shall be made without the
                 mutual and written agreement of both parties.

   
         (b)     During the Research Program Term and for a period of two (2)
                 years thereafter, Corixa shall not enter into any commercial
                 agreement with a Third Party with respect to a collaboration
                 regarding the BC Field without the prior written consent of SB.
                 Subject to provisions of Paragraph 4(c), notwithstanding the
                 preceding sentence, Corixa may enter into research agreements
                 that provide for the in-licensing of intellectual property that
                 may be useful in the Research Program, provided that any such
                 agreement shall provide that Corixa will own and/or control all
                 intellectual property rights related to the Licensed Field
                 arising from such agreement and that Corixa Antigens arising
                 from the use of it  shall automatically fall within the scope
                 of the rights and licences granted to SB by Corixa hereunder.
    

         (c)     The objective of the Research Program will be the development
                 of Product(s).  At SB's option, Corixa Antigens and/or
                 Research Program Antigens shall be combined with SB Antigens
                 and/or adjuvants of SB, and such combinations may result in
                 discrete versions of the Product(s), consisting of potentially
                 different mixtures of Antigens and/or adjuvants and/or Corixa
                 Antigens and/or Research Program Antigens and/or SB Antigens.


3.       RESEARCH PROGRAM TERM AND TERMINATION.

   
     (a)         The Research Program will be effective from January 1, 1997 to
         December 31, 1998 (the "Research Program Term") and shall be renewable
         for up to three (3) additional one (1) year periods. SB shall have no
         obligation to renew the Research Program beyond December 31, 1998, and
         any such renewal shall be at SB's entire discretion. Corixa undertakes
         to : (i) use all reasonable efforts to materially perform all
         activities set forth in the Research Program; (ii)  use all reasonable
         efforts to achieve the Research Program's objective; and (iii) use all
         reasonable efforts to achieve the Milestone within the initial
         Research Program Term.
    

     (b)         At least four and a half (4 1/2) months prior to the end of
         the initial Research Program Term and provided Corixa has met the
         Milestone, SB shall have the option, exercisable by giving Corixa
         written notice of its intent, to renew the Research Program for a
         minimum of one (1) additional year and the parties shall agree upon
         the terms and conditions including the financial elements regarding
         such renewal, which at a minimum shall be as set forth in Paragraph 5
         (c) below. 
      








                                      -8-
<PAGE>   9

         The parties shall at the same time agree upon the scope of
         the Research Program during such extended Research Program Term.
         Thereafter, or in the event Corixa has not met the Milestone, SB shall
         notify Corixa of its intention to renew the Research Program at least
         two (2) months before the termination of each affected Research
         Program Term, as renewed from time to time.


4.       LICENSE GRANT

         (a)     Subject to the terms and conditions of this Agreement,
                 including, without limitation, the license payments and
                 royalty provisions in Sections 5 and 6 below, Corixa hereby
                 grants to SB an exclusive license, with the right to grant
                 sublicenses, under Corixa Patents, Joint Research Program
                 Patents, Know-How and any SPC to make, have made, use, have
                 used, sell, offer for sale, have sold, keep and import any and
                 all Products in the Licensed Field  in the Territory, in any
                 formulation, configuration, combination and/or with any
                 delivery system.  For purpose of clarity, the foregoing
                 license shall include rights of SB to Corixa Antigens and/or
                 Research Program Antigens in and outside the BC Field but in
                 the Licensed Field; any commercial use of such Corixa Antigens
                 and/or Research Program Antigens shall be subject to the
                 royalties set forth in Section 6 in the same manner as
                 royalties are paid on Products thereunder.

         (b)     In the event that a governmental agency in any country or
                 territory grants or compels Corixa to grant a license to any
                 Third Party for product(s) that compete(s) with Product, SB
                 shall have the benefit in such country or territory (and any
                 other country into which products that compete with Product
                 are sold by such Third Party compulsory licensee) of the terms
                 granted to such Third Party to the extent that such terms are
                 more favourable to the Third Party than those granted to SB
                 under this Agreement.

         (c)     During the Research Program Term, if Corixa or SB believes
                 that technology related to the subject matter of the Research
                 Program that is controlled by a Third Party including GenQuest
                 Inc., which may include new Antigens, adjuvants and/or
                 Blocking Patents ("Additional Technology") would be valuable
                 or necessary to the Research Program in the Licensed Field
                 hereunder, Corixa or SB as appropriate shall present such
                 Additional Technology, along with a written report with
                 respect thereto to the Joint Research Team.  The Joint
                 Research Team shall then determine, except for Blocking
                 Patents which shall be at SB's sole discretion subject to
                 other provisions contained herein, whether licenses to, and/or
                 acquisitions of, such Additional Technology should be made,
                 the party that shall approach and negotiate with any Third
                 Party(ies) and the terms of any agreement(s) with any Third
                 Parties, including, without limitation, payments for sponsored
                 research.  No such Third Party license and/or acquisition
                 shall be effective with respect to SB unless and until SB has
                 specifically agreed in writing to abide by the applicable
                 terms and conditions of any such license and/or acquisition,
                 and to make such payments and/or royalties as are mutually
                 agreed to by the parties and provided further that the access
                 to and acquisition of any Blocking Patents shall be decided by
                 SB at its entire discretion, provided however that if Corixa
                 disagrees on the acquisition by SB of a Blocking Patent, the
                 matter shall be submitted for resolution to the CEO of Corixa
                 and the Senior Vice President and General Manager of SB.  
                 In case of persistent disagreement, the matter shall be 
                 submitted to arbitration pursuant to Section 12 below.  
                 In any event, the parties





                                      -9-
<PAGE>   10

                 shall behave reasonably and adopt a standard of 
                 reasonableness in their assessment of the matter.  
                 Notwithstanding the foregoing, this Paragraph 4(c) shall not 
                 be deemed to preclude either party from acquiring Additional 
                 Technology.

   
         (d)     Corixa hereby grants SB an option during a two (2) year period
                 from the end of the Research Program to acquire an exclusive
                 license under any Corixa Patents filed by Corixa and/or
                 Know-How developed by Corixa during said two (2) year
                 period and/or which are owned and/or controlled by Corixa
                 and/or under which Corixa otherwise has the right to grant
                 licenses for use in the BC Field during a period of two (2)
                 years after the Research Program Term as may be extended.
                 License terms and conditions with respect to licensing-in such
                 Corixa Patents and/or Know-How shall be negotiated in good
                 faith between the parties taking into account the value of such
                 Corixa Patents and/or Know-How and their contribution to the
                 successful development of Product in the BC Field, but shall in
                 no event have the effect of rendering the terms of this
                 Agreement less favourable to Corixa than those currently agreed
                 upon.
    


5.   LICENSE PAYMENTS.  SB will make the following payments to Corixa under
     this Agreement by wire transfer of immediately available funds:

         (a)     Technology access fees in the following amounts:

<TABLE>
<CAPTION>
                 ----------------------------------------------------------------------------------------------
                                    PAYMENT DATE                                 PAYMENT AMOUNT (U.S.$)
                 ----------------------------------------------------------------------------------------------
                 <S>                                                             <C>
                 Execution of this Agreement                                      [***]
                 April 1, 1997                                                    [***]
                 July 1, 1997                                                     [***]
                 October 1, 1997                                                  [***]
                 January 1, 1998                                                  [***]
                 April 1, 1998                                                    [***]
                 July 1, 1998                                                     [***]
                 October 1, 1998                                                  [***]
                 Second anniversary of this Agreement                             [***]         (the "Milestone
                                                                                                Payment")
                 ----------------------------------------------------------------------------------------------
</TABLE>

                 Notwithstanding the foregoing, SB will only be obligated to
                 make the Milestone Payment on the [***] of this Agreement if
                 the following conditions are satisfied or waived (the
                 "Milestone Payment Conditions"): (i) Corixa has achieved the
                 Milestone (as determined by the Joint Research Team) and (ii)
                 the Research Program has not been terminated effective on or
                 before the date the Milestone Payment is due.  If SB is not
                 obligated to make the Milestone Payment on the [***] of this
                 Agreement, then the Milestone Payment shall be delayed and
                 shall become due and payable on the [***] of this Agreement
                 provided the Milestone Payment Conditions have been satisfied
                 or waived, or if not satisfied or waived, then on the [***] of
                 this Agreement provided that the Milestone Payment Conditions
                 have by then been satisfied or waived, or if not satisfied or
                 waived, then on the [***] of this Agreement provided that the
                 Milestone Payment Conditions have by then been satisfied or
                 waived. If SB is not obligated to make the Milestone Payment on
                 or         
  



                                      -10-
<PAGE>   11

                 before the [***] of this Agreement and if SB extends the
                 Research Program Term beyond the [***] of this Agreement, then
                 SB shall pay Corixa a one time non-refundable payment of U.S.
                 [***] on the [***] hereof only, which shall be fully creditable
                 against the Milestone Payment to the extent the latter becomes
                 due and payable on the [***] of this Agreement.
                 Notwithstanding the foregoing, if the Milestone Payment
                 Conditions are not satisfied or waived on or before the [***]
                 of this Agreement, the balance of the Milestone Payment shall
                 be forever waived and discharged by Corixa.

        (b)      In addition to the technology access fees payable pursuant to
                 Paragraph 5(a) above, SB also agrees to pay Corixa the
                 following one-time milestone payments, to be made via wire
                 transfer of immediately available funds in U.S.$, within ten
                 (10) days of receipt of notice from SB to Corixa of
                 achievement of each of the following milestones with respect
                 to the first Product to meet such milestone :


<TABLE>
<CAPTION>
                 ----------------------------------------------------------------------------------------------
                                      MILESTONE                                         PAYMENT (U.S.$)
                 ----------------------------------------------------------------------------------------------
                 <S>          <C>                                                       <C>
                 (i)          Approval of IND                                           [***]
                 (ii)         Start of Phase II clinical trials                         [***]
                 (iii)        Start of Phase III clinical trials                        [***]
                 (iv)         Submission for regulatory                                 [***]
                              approval in U.S.
                 (v)          Regulatory approval in at least                           [***]
                              [***]
                 (vi)         Regulatory approval in U.S.                               [***]
                 ----------------------------------------------------------------------------------------------
</TABLE>


                 the milestones payments set forth in Subparagraphs 5(b)(iv),
                 (v) and (vi) above are fully creditable against future
                 royalties payable pursuant to Section 6, provided such
                 royalties will not be reduced by more than [***] in any given
                 year.  Any uncredited portion will be carried forward for
                 credit in subsequent years.

         (c)     In the event SB wishes to extend the Research Program beyond
                 the second anniversary of this Agreement, the parties estimate
                 that the following additional technology access fees would be
                 required, which fees in Subparagraph 5(c)(ii) below are
                 subject to increase or decrease by mutual agreement of the
                 parties based upon the scope of work to be conducted:

                 i)       For the [***] year : [***] U.S. dollars) per quarter;

                 ii)      For the [***] years: a minimum of [***] of the [***]
                          year funding level.










                                      -11-
<PAGE>   12

                


6.       ROYALTIES.  SB will pay Corixa a royalty on Net Sales of Products as
         follows:

         (a)     Subject to Paragraphs 6(d) and 6(e) below, on annual Net Sales
                 of Products sold  in countries where current claims of any
                 Corixa Patent and/or Joint Research Program Patent are issued
                 or are pending for up to [***] years from the date of
                 first filing anywhere in the world (the priority date) or if
                 pending after such [***] year period, then not until such
                 time as issued, if ever, SB shall pay royalties on annual Net
                 Sales of Product (the "Patent Royalty") payable on each
                 portion of annual Net Sales of Product as follows:

<TABLE>
<CAPTION>
                 ----------------------------------------------------------------------------------------------
                            Net Sales                                   Patent in               Minimum Royalty
                                                                     Country of Sale
                 ----------------------------------------------------------------------------------------------
                 <S>               <C>                                        <C>                       <C>
                 [***]             [***]                                   [***]                      [***]
                 [***]             [***]                                   [***]                      [***]
                 [***]             [***]                                   [***]                      [***]
                 ----------------------------------------------------------------------------------------------
</TABLE>

         (b)     To the extent the royalties set forth in Paragraph 6 (a) are
                 not applicable to a Product, then provided SB has actually
                 received and uses Know-How from Corixa in any Product, which
                 Know-How is Secret, Substantial and has been Identified by
                 Corixa, the percentage royalty rates specified below will be
                 payable for any Product sold into a country where, (x) a patent
                 application for a Corixa Patent and/or a Joint Research Program
                 Patent with claims covering the Product has been pending and no
                 patent with claims covering such Product has issued for a
                 period of more than [***] or (y) no patent application covering
                 such Product has been filed in the country of sale (the
                 "Know-How Royalty"), as adjusted based on the existence of
                 Competition in the respective country, as follows:


<TABLE>
<CAPTION>
                  -----------------------------------------------------------------------------------------------
                       Net Sales                                  No Patent -        No Patent -          Minimum
                                                                      No            Competition          Royalty
                                                                 Competition
                  -----------------------------------------------------------------------------------------------
                  <S>                                                <C>                <C>                 <C>
                  [***]                                              [***]              [***]              [***]
                  [***]                                              [***]              [***]              [***]
                  [***]                                              [***]              [***]              [***]
                  -----------------------------------------------------------------------------------------------
</TABLE>


         (c)     Royalties under Paragraph 6 (a) shall be payable on a
                 country-by-country basis for the life of any valid granted
                 Corixa Patent and/or Joint Research Program Patent which has
                 not been successfully opposed by a Third Party or revoked on a
                 country-by-country basis. Royalties under Paragraph 6(b)
                 shall expire on a country-by-country basis [***] after
                 first launch of the first Product in any such country.

         (d)     Except for Antigens licensed hereunder that are covered by
                 Blocking Patent which are covered in Paragraph 6(e) below, SB
                 and Corixa shall share [***] any and all Third Party royalties
                 payable on Additional Technology or for





                                      -12-
<PAGE>   13

                
                 technology that is owned and/or controlled by a Third Party and
                 which is licensed to SB, incorporated into the Product(s),
                 which may include but shall not be limited to, royalties
                 payable for adjuvants such as, by way of an example only, [***]
                 adjuvants and other technology useful or necessary for the
                 Product.  Corixa's contribution to such share shall be through
                 [***] For the Know-How Royalty, the royalty rates, as set forth
                 in Paragraph 6(b) shall apply on the rates as reduced according
                 to this Paragraph 6(d), provided SB has royalty obligations
                 towards Third Party(ies) on its sales in those countries.  In
                 the case both 6(d) and 6(e) apply, reductions in accordance
                 with 6(d) shall apply first.

         (e)     In the event of a Blocking Patent covering Corixa Antigens
                 and/or Research Program Antigens licensed hereunder, royalty
                 obligations to the Third Party will be [***]

         (f)     From the first launch of Product anywhere in the Territory SB
                 shall provide a royalty report and, if applicable, a royalty
                 payment to Corixa every six (6) months.  The report and
                 payment relating to Net Sales shall be provided within sixty
                 (60) days after June 30 and December 31 of each calendar year
                 and shall include all Net Sales of Product by SB and its
                 Affiliates, licensees or sublicensees.  SB shall keep, and
                 require any Affiliate, licensee and sublicensee to keep, for a
                 period of not less than five (5) years, complete and accurate
                 records of all Net Sales of Product.  Corixa shall have the
                 right, at Corixa's sole expense except as hereinafter
                 provided, through a certified public accountant reasonably
                 acceptable to SB, and following reasonable notice, to examine
                 such records during regular business hours during the life of
                 the SB obligation to pay royalties on Product; provided,
                 however, that such examination shall not (i) be of records for
                 more than the prior two (2) years, (ii) take place more often
                 than once a year, and (iii) cover any records which date prior
                 to the date of the last examination, and provided further that
                 such accountants shall report to Corixa only as to the
                 accuracy of the royalty statements and payments.  Copies of
                 such reports shall be supplied to SB.
          
                 In the event the report demonstrates that SB has underpaid
                 royalties, SB shall pay such royalties immediately upon
                 request of Corixa and to the extent such under payment is more
                 than [***] for the audited period, shall reimburse Corixa for
                 the expense of the audit.  If SB has overpaid royalties, SB may
                 deduct such over-payments from future royalties owed to Corixa.



                                      -13-
<PAGE>   14
         (g)     In addition to, and simultaneous with, the royalty reports set
                 described in Paragraph 6(f) above, SB's Senior Vice President
                 and General Manager shall deliver to Corixa a certificate (the
                 "Royalty Certificate") stating that during the previous six (6)
                 month period, the following factors (the "Royalty Factors")
                 have equalled in the aggregate no more than [***] total sales
                 of Product during such six (6) month period:  (i) normal
                 customary trade discounts allowed and taken; (ii) rebates to
                 wholesalers; (iii) any deductions allowed for government-
                 mandated vaccine insurance premiums, such as the National 
                 Childhood Vaccine Injury Act in the U.S.; and (iv) any 
                 deduction, at standard cost, for special administration 
                 devices and the packaging and filling thereof, such as pre-
                 filled syringes.  In the event the Royalty Factors exceed 
                 [***] any six (6) month period, SB may deduct such greater 
                 percentage for such six (6) month period only, but shall 
                 provide Corixa with a written explanation setting forth the 
                 reasons for such excess and shall provide Corixa with a 
                 certificate that will state that the pricing of all Products 
                 sold by SB and/or its Affiliates has been on an "arms length"
                 basis and not set so as to subsidize sales of other products 
                 sold by SB and/or its Affiliates.  In the event of a 
                 disagreement with respect to size of the Royalty Factors
                 in any given six (6) month period, the CEO of Corixa and the
                 Senior Vice President and General Manager of SB shall first
                 attempt to resolve such disagreement through good faith
                 negotiation.  In the event such resolution is not achieved, the
                 disagreement shall finally be resolved through arbitration
                 pursuant to Section 12 hereof.

         (h)     Royalties shall be paid by SB in U.S. dollars with currency
                 conversions calculated based upon the applicable closing
                 exchange rates quoted by the Foreign exchange desk of the
                 Generale de Banque, Brussels, Belgium on the last business day
                 of the applicable six (6) month period.

   
         (i)     Corixa shall pay to SB any royalty payments it actually
                 receives from GenQuest related directly to the sale of antibody
                 therapeutics (a "GenQuest Antibody Product") sold by GenQuest
                 or one of its licensees ("GenQuest"), provided, however, that
                 no such royalty shall be paid to SB by Corixa unless all of the
                 following conditions have been met:


                 (a)  such royalties are paid to Corixa by GenQuest for sale of
                      GenQuest Antibody Product that is comprised of an antibody
                      or antibody fragment directed to an Antigen which is
                      identical to at least one of the Antigens developed under
                      the Research Program and is contained in a Vaccine product
                      that is actively being marketed and sold in Europe and/or
                      North America by SB.

                 (b)  the GenQuest Antibody Product has been approved for use in
                      the same indication by the appropriate regulatory
                      authorities in the countries in which it is sold.
    
                        

                                      -14-
<PAGE>   15
7.       OTHER TERMS.

         (a)     MARKETING RIGHTS.  Upon receipt of regulatory approval in the
                 Territory, SB shall use its reasonable commercial efforts to
                 launch and market the Product.  Under the license granted
                 herein, SB may select sublicensees to maximize market
                 penetration.  Corixa may review product marketing plans prior
                 to launch and annually, provided arrangements for such reviews
                 are made in advance, but SB will have the right to make all
                 final determinations with respect to any differences of
                 opinion that arise as part of such review.

         (b)     MANUFACTURING.  Corixa will provide reasonable quantities of
                 preclinical test material for SB as required through the course
                 of the Research Program at no additional charge to SB. These
                 materials will include sufficient quantities of [***]. It is
                 anticipated that SB will provide for later stage (clinical) and
                 commercial requirements.

         (c)     PRODUCT DEVELOPMENT.  SB shall have responsibility for, and
                 control of, the development and commercialization of each
                 Product arising from this Agreement, including process
                 development, delivery system and formulation development,
                 preclinical studies, clinical studies, sales and marketing.


8.       JOINT RESEARCH TEAM.

        (a)      A joint research team will be established within thirty (30)
                 days after the full execution of this Agreement,  responsible
                 for regular coordination and monitoring of the research
                 activities as well as patent related activities (the "Joint
                 Research Team").  The Joint Research Team will consist of at
                 least two (2) individuals from each of SB and Corixa.  To
                 facilitate such coordination, the parties will share all
                 research data generated in this collaboration with each other
                 on a prompt and regular basis, which shall be at a minimum,
                 every three (3) months during quarterly meetings to be held
                 alternatively at Seattle and Rixensart.  In addition, Corixa
                 shall provide SB with written monthly reports on the progress
                 of the Research Program.  The data generated shall be subject
                 to the confidentiality provisions of Section 11 of this
                 Agreement. The Joint Research Team will review the Research
                 Program annually, implement any mutually agreeable
                 modifications and make recommendations related to possible
                 Research Program extensions to the respective senior
                 management teams of each company.  In the event that the
                 members of the Joint Research Team are unable to agree on a
                 particular course of action, any such disagreement shall be
                 resolved in good faith by the CEO of Corixa and the Senior
                 Vice President and General Manager of SB together,
                 respectively. In case the disagreement relates to the
                 appropriateness of filing a patent application on any
                 invention arising out of the Research Program, each party
                 hereto shall be given an opportunity to file for applications
                 in its own right and in its own name  and shall bear the
                 expenses thereof.












                                      -15-
<PAGE>   16
   

         (b)     From the amounts specified in Paragraph 5(a) Corixa shall
                 allocate U.S. [***] U.S.  dollars) to the performance of the
                 Research Program for the first two (2) years.  In the event the
                 amounts specified have not been dedicated fully to the Research
                 Program, the Joint Research Team will decide how these amounts
                 shall be allocated by Corixa to a further usage of the Research
                 Program.  On an annual basis, Corixa shall provide to the Joint
                 Research Team a report in reasonable detail setting forth the
                 use of funds provided by SB to Corixa under Paragraph 5(a) of
                 this Agreement.
    


9.       INVENTIONS.

         Patentable inventions or discoveries which arise from the Research
         Program and which are made by an employee or agent of Corixa, solely or
         jointly other than with an employee or agent of SB, shall be owned by
         Corixa. Patentable inventions or discoveries which arise from the
         Research Program and which are made jointly by employees or agents of
         Corixa and SB shall be jointly owned by Corixa and SB and treated as
         joint inventions under the U.S. laws applicable to joint inventions
         (collectively, "Joint Inventions"). Patentable inventions or
         discoveries which arise from the Research Program and which are made by
         an employee or agent of SB, solely or jointly other than with an
         employee or agent of Corixa, shall be owned by SB. Except as otherwise
         set forth in this Agreement, SB and Corixa shall retain their
         respective unrestricted rights to make, have made, use and sell all
         such inventions and discoveries which are owned solely by them . In the
         event this Agreement is terminated by either party as a result of an
         uncured breach by the other party under Paragraph 17(c) hereof, without
         further action on the part of either party, the non-breaching party
         will receive an exclusive license to all Joint Research Program Patents
         and Joint Inventions in the Licensed Field and Know-How associated
         therewith provided, however, that in the case this Agreement is
         terminated by Corixa for uncured breach by SB, such license shall in no
         event include SB Patents, and provided further that if the
         non-breaching party is Corixa, such licence shall be non-royalty
         bearing and if the non-breaching party is SB, such licence shall be
         royalty bearing as per the present contract but all other aspects of
         the contractual relationship other than survival clauses, including
         Research Program and Technology Access Fees, shall terminate forthwith
         while the licenses and rights granted to SB shall be maintained. In
         such event, the breaching party agrees to take all steps necessary to
         effectuate such license to the other party in accordance with this
         Section 9.


10.      PATENTS; PROSECUTION AND LITIGATION.

         (a)     Corixa shall have the right and the obligation to prosecute
                 and maintain all Corixa Patents and Joint Research Program
                 Patents and shall do so in a timely manner.  Corixa shall
                 disclose to SB the complete texts of all patents and patent
                 applications filed by Corixa which relate to any Product
                 (including Corixa Patents and Joint Research Program Patents)
                 as well as all information received concerning the institution
                 or possible institution of any interference, opposition,
                 re-examination, reissue, revocation, nullification or any
                 official proceeding involving any patent licensed herein
                 anywhere in the Territory.  SB shall have the right to review
                 all





                                      -16-
<PAGE>   17

                 such pending applications and other proceedings and make
                 recommendations to Corixa concerning them and their conduct.
                 Corixa agrees to keep SB promptly and fully informed of the
                 course of patent prosecution or other proceedings including by
                 providing SB with copies of substantive communications, search
                 reports and Third Party observations submitted to or received
                 from patent offices throughout the Territory.  Corixa shall
                 provide such patent consultation to SB at no cost to SB.  SB
                 shall hold all information disclosed to it under this Section
                 as confidential.  SB shall reimburse Corixa for all reasonable
                 and documented costs incurred by Corixa prior to the Effective
                 Date in connection with the filing, prosecution and maintenance
                 of the Corixa Patents and for all reasonable and documented
                 costs incurred by Corixa during the term of this Agreement in
                 connection with the filing, prosecution and maintenance of the
                 Corixa Patents and/or the Joint Research Program Patents up to
                 an amount of [***] per year.  Any costs incurred by Corixa in
                 connection with the filing, prosecution and maintenance of
                 Corixa Patents and/or Joint Research Program Patents in excess
                 of said [***] shall be reimbursed by SB to Corixa only if they
                 have been specifically approved and authorized by the Joint
                 Research Team, in its reasonable discretion, and if they are
                 reasonable and documented.  In determining whether to approve
                 such additional expenses, the Joint Research Team shall apply
                 reasonable standards taking into consideration the norms of the
                 biotech industry in general.

         (b)     In the event Corixa intends to finally abandon any patent or
                 any part of a patent (including Corixa Patents) covered by
                 this Agreement, it shall notify SB and SB shall have the right
                 at its own expense to assume responsibility for any such
                 patent or part of patent.

         (c)     In the event of the initiation of any suit by a Third Party
                 against Corixa, SB or the Affiliates of either for patent
                 infringement involving the manufacture, use, sale,
                 distribution or marketing of Product anywhere in the
                 Territory, the party sued shall promptly notify the other
                 party in writing.  SB shall have the right but not the
                 obligation to defend such suit at its own expense.  Corixa and
                 SB shall assist one another and cooperate in any such
                 litigation at the other's request without expense to the
                 requesting party.

         (d)     Subject to subparagraph (f) herebelow, in the event of any
                 threat or initiation of any legal action by a Third Party
                 challenging the validity of any patent covered by this
                 Agreement, Corixa shall have, at its own expense, the control
                 over the conduct and defense of such action in case it is
                 directed against Corixa Patents and SB shall have, at its own
                 expense, the control over the conduct and defense of any such
                 action directed against SB Patents and the first right to
                 control, at its own expense, the conduct and defense of any
                 such action directed against Joint Research Program Patents.
                 If SB elects not to conduct and defend such action directed
                 against Joint Research Program Patents, Corixa shall have the
                 right to do it at its own expense.





                                      -17-
<PAGE>   18
         (e)     In the event that Corixa or SB becomes aware of actual or
                 threatened infringement of a patent covered by this Agreement
                 with respect to Products anywhere in the Territory, that party
                 shall promptly notify the other party in writing.  SB shall
                 have the first right but not the obligation to bring an
                 infringement action against any Third Party and to use
                 Corixa's name in connection therewith.  If SB does not
                 commence a particular infringement action within ninety (90)
                 days, Corixa, after notifying SB in writing, shall be entitled
                 to bring such infringement action at its own expense.  The
                 party conducting such action shall have full control over its
                 conduct, provided that in the case Corixa is leading the
                 action it may not enter into any settlement without SB's
                 consent.  In any event, Corixa and SB shall assist one another
                 and cooperate in any such litigation at the other's request
                 without expense to the requesting party.

         (f)     Corixa and SB shall recover their respective actual
                 out-of-pocket expenses, or equitable proportions thereof,
                 associated with any litigation or settlement thereof from any
                 recovery made by any party.  In the event SB takes
                 responsibility for such actions, it shall bear [***] of the
                 expenses other than out-of-pocket expenses and Corixa shall
                 bear the remaining [***], provided that Corixa's remaining
                 share of the expenses do not exceed [***] of royalties owed to
                 Corixa by SB. Any excess amount shall be shared between SB and
                 Corixa, with SB receiving [***] and Corixa receiving [***] of
                 such excess.  In the event Corixa takes responsibility for such
                 actions, Corixa will undertake all actions at its own entire
                 expense and recover [***] of any excess.

         (g)     The parties shall keep one another informed of the status of
                 their respective activities regarding any litigation or
                 settlement thereof concerning Product.

         (h)     DISCLAIMER OF WARRANTIES.  CORIXA MAKES NO REPRESENTATIONS OR
                 WARRANTIES, EXPRESS OR IMPLIED OTHER THAN THOSE CONTAINED IN
                 SECTION 16 BELOW, WITH RESPECT TO THE CORIXA PATENTS, THE
                 JOINT RESEARCH PROGRAM PATENTS OR KNOW-HOW, AND ANY PRODUCTS
                 RELATED THERETO INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF
                 MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

   
         (i)     In the event GenQuest establishes a research and license
                 agreement with a Third Party, and such partnership includes
                 the reimbursement of patent expenses by such Third Party to
                 GenQuest, reasonable patent expenses directly related to any
                 patents shared between GenQuest and Corixa pursuant to the
                 Research Program shall be equally shared between SB and the
                 Third Party, subject to provision to SB of reasonable
                 documentation supporting such expenses.
    

11.      CONFIDENTIALITY; PUBLICITY; PUBLICATIONS.

         (a)     During the term of this Agreement, Corixa shall promptly
                 disclose to SB and/or supply SB in a timely fashion with all
                 documented Know-How, all Corixa Patents and all relevant
                 patent applications filed and/or controlled by Corixa, all
                 Corixa





                                      -18-
<PAGE>   19

                 Antigens and all inventions related to the Licensed Field
                 arising from the Research Program as may be extended and during
                 a period of [***] thereafter.  In addition, each party will
                 provide the other party with all information which is
                 reasonably necessary or useful for achieving the goals of the
                 Research Program.

         (b)     During the term of this Agreement, each party shall promptly
                 inform the other party of any information that it obtains or
                 develops regarding the utility and safety of any Product and
                 shall promptly report to the other party any confirmed
                 information of serious or unexpected reactions or side effects
                 related to the utilization or medical administration of
                 Product.

         (c)     During the term of this Agreement and for five (5) years
                 thereafter, irrespective of any termination earlier than the
                 expiration of the term of this Agreement, Corixa and SB shall
                 not use or reveal or disclose to any Third Party any
                 confidential information received from the other party or
                 otherwise developed by either party in the performance of
                 activities in furtherance of this Agreement without first
                 obtaining the written consent of the disclosing party, except
                 as may be otherwise provided herein, or as may be required for
                 purposes of investigating, developing, manufacturing or
                 marketing Product or for securing essential or desirable
                 authorizations, privileges or rights from governmental
                 agencies, or is required to be disclosed to a governmental
                 agency, or is necessary to file or prosecute patent
                 applications concerning Product or to carry out any litigation
                 concerning Product.  This confidentiality obligation shall not
                 apply to such information which is or becomes a matter of
                 public knowledge, or is already in the possession of the
                 receiving party, or is disclosed to the receiving party by a
                 Third Party having the right to do so, or is subsequently and
                 independently developed by employees of the receiving party or
                 Affiliates thereof who had no knowledge of the confidential
                 information disclosed.  The parties shall take reasonable
                 measures to assure that no unauthorized use or disclosure is
                 made by others to whom access to such information is granted.

         (d)     Nothing herein shall be construed as preventing SB from
                 disclosing any information received from Corixa to an
                 Affiliate, sublicensee or distributor, provided such Affiliate
                 is bound by similar confidentiality obligations and such
                 sublicensee or distributor has undertaken in writing a similar
                 obligation of confidentiality with respect to the confidential
                 information, with Corixa stated as a Third Party beneficiary
                 thereof.

         (e)     All confidential information disclosed by one party to the
                 other shall remain the intellectual property of the disclosing
                 party. In the event that a court or other legal or
                 administrative tribunal, directly or through an appointed
                 master, trustee or receiver, assumes partial or complete
                 control over the assets of a party to this Agreement based on
                 the insolvency or bankruptcy of such party, the bankrupt or
                 insolvent party shall promptly notify the court or other
                 tribunal (i) that confidential information received from the
                 other party under this Agreement remains the property of the
                 other party and (ii) of the confidentiality obligations under
                 this Agreement.  In addition, the bankrupt or insolvent party
                 shall, to the extent permitted by law, take all steps necessary
                 or desirable to maintain the





                                      -19-
<PAGE>   20
                 confidentiality of the other party's confidential information
                 and to insure that the court, other tribunal or appointee
                 maintains such information in confidence in accordance with the
                 terms of this Agreement.

         (f)     The parties to this Agreement may disclose the nature of the
                 intended Agreement in a press release following signature,
                 provided, however, except for the disease target under the
                 Research Program, that the terms of the Agreement are not
                 disclosed by either party.  The wording of any press release
                 must be agreed to by both parties in advance of its release,
                 provided that such agreement is not unreasonably withheld by
                 either party.

         (g)     Neither party will publish or provide public disclosure of
                 information or inventions arising from the Research Program (a
                 "Dissemination") without at least sixty (60) days prior
                 written notice of such planned publication or disclosure sent
                 to the other party.  In the event any such Dissemination is
                 determined by the other party to be detrimental to its
                 intellectual property position, the disseminating party will
                 delay such publication for a period sufficient to allow the
                 other party to take the steps necessary to protect such
                 intellectual property, including the filing of any patent
                 applications and/or deletion of its confidential information.


12.      GOVERNING LAW; ARBITRATION.

         This Agreement will be governed by the laws of the State of Washington,
         USA. Any dispute, controversy or claim arising out of or in relation to
         this Agreement or the breach, termination or invalidity thereof, that
         cannot be settled amicably by agreement of the parties hereto, shall be
         finally settled by arbitration in accordance with the arbitration rules
         of the American Arbitration Association ("AAA"), then in force, by one
         or more arbitrators appointed in accordance with said rules; provided
         that the appointed arbitrators shall have appropriate experience in the
         biopharmaceutical industry; provided further, however, that arbitration
         proceedings may not be instituted until the party alleging breach of
         this Agreement by the other party has given the other party not less
         than sixty (60) days notice (or in the case of non- payment pursuant to
         Section 5 or 6 then fourteen (14) days notice) to remedy any alleged
         breach and the other party has failed to do so. The place of
         arbitration shall be Seattle, Washington, USA if arbitration is
         initiated by SB and New York, New York, USA if initiated by Corixa. The
         award rendered shall be final and binding upon both parties. The
         judgment rendered by the arbitrator(s) shall include costs of
         arbitration, reasonable attorneys' fees and reasonable costs for any
         expert and other witnesses. The arbitration in such proceeding may
         expressly consider the amounts paid pursuant to Section 5 hereof in
         considering any claim of damages. Nothing in this Agreement shall be
         deemed as preventing either party from seeking injunctive relief (or
         any other provisional remedy) from any court having jurisdiction over
         the parties and the subject matter of the dispute as necessary to
         protect either party's name, proprietary information, trade secrets,
         know-how or any other proprietary rights. Judgment upon the award may
         be entered in any court having jurisdiction, or application may be made
         to such court for judicial acceptance of the award and/or an order of
         enforcement as the case may be.





                                      -20-
<PAGE>   21

13.      MISCELLANEOUS.

         (a)     TRADEMARK.  SB shall be responsible for the selection, and SB
                 shall be responsible for registration and maintenance, of all
                 trademarks which are employed in connection with Product and
                 SB shall own and/or control any such trademarks; provided that
                 prior to selection of such trademarks, SB shall provide Corixa
                 an opportunity to review and comment on any such trademark.

         (b)     FORCE MAJEURE.  If the performance of any part of this
                 Agreement by either party, or of any obligation under this
                 Agreement, is prevented, restricted, interfered with or
                 delayed by reason of any cause beyond the reasonable control
                 of the party liable to perform, unless conclusive evidence to
                 the contrary is provided, the party so affected shall, upon
                 giving written notice to the other party, be excused from such
                 performance to the extent of such prevention, restriction,
                 interference or delay, provided that the affected party shall
                 use its reasonable best efforts to avoid or remove such causes
                 of nonperformance and shall continue performance with the
                 utmost dispatch whenever such causes are removed.  When such
                 circumstances arise, the parties shall discuss what, if any,
                 modification of the terms of this Agreement may be required in
                 order to arrive at an equitable solution.

         (c)     SEVERABILITY.

                 (i)      In the event any portion of this Agreement shall be
                          held illegal, void or ineffective, the remaining
                          portions hereof shall remain in full force and
                          effect;

                 (ii)     If any of the terms or provisions of this Agreement
                          are in conflict with any applicable statute or rule
                          of law, then such terms or provisions shall be deemed
                          inoperative to the extent that they may conflict
                          therewith and shall be deemed to be modified to
                          conform with such statute or rule of law.

         (d)     ENTIRE AGREEMENT.  This Agreement, entered into as of the date
                 first written above, constitutes the entire agreement between
                 the parties relating to the subject matter hereof and
                 supersedes all previous writings and understandings except
                 that the Non Disclosure Agreements dated 17 February 1995 and
                 10 August 1995, the Tuberculosis collaboration and Licence
                 Agreement dated October 6, 1995 between Corixa Corporation and
                 SmithKline Beecham Biologicals S.A., the Prostate Cancer
                 Collaboration and License Agreement of even date herewith and
                 the Option Agreement of even date herewith remain in full
                 force and effect.  No terms or provisions of this Agreement
                 shall be varied or modified by any prior or subsequent
                 statement, conduct or act of either of the parties, except
                 that the parties may mutually amend this Agreement by written
                 instruments specifically referring to and executed in the same
                 manner as this Agreement.







                                      -21-
<PAGE>   22
14.      NOTICES.

         (a)     Any notice required or permitted under this Agreement shall be
                 deemed given if delivered (i) personally, (ii) by facsimile
                 transmission (receipt verified), (iii) by registered or
                 certified mail (return receipt requested), postage prepaid, or
                 (iv) sent by express courier service (receipt verified), to
                 the following addresses of the parties  :

                                              If to Corixa:
                                              Corixa Corporation
                                              1124 Columbia Street, Suite 464
                                              Seattle, WA  98104
                                              Attention: Chief Operating Officer

                                              Telephone : (206) 667-5711
                                              Telecopy : (206) 667-5715

                                              with a copy to : Venture Law Group
                                              4750 Carillon Point
                                              Kirkland, Washington 98033
                                              Attention : William W. Ericson
                                              Telephone : (206) 739-8700
                                              Telecopy : (206) 739-8750

                                              If to SB:
                                              SmithKline Beecham Biologicals
                                              Manufacturing s.a.
                                              Rue de l'Institut 89
                                              1330 Rixensart, Belgium
                                              Attention: Senior Vice President,
                                              General Manager
                                              Telephone : 32-2-656 8250
                                              Telecopy : 32-2-656 8025

         (b)     Any notice required or permitted to be given concerning this
                 Agreement shall be effective upon receipt by the party to whom
                 it is addressed.


15.      ASSIGNMENT.

         Neither this Agreement nor any interest hereunder shall be assignable
         by either party without the written consent of the other provided,
         however, that either party may assign this Agreement and all patents
         related to this Agreement to an Affiliate or to any corporation or
         other entity with which it may merge or consolidate, and/or to any
         corporation or other entity to which it may transfer all or
         substantially all of its assets, without obtaining the consent of the
         other party; provided that the consent of SB shall be required for any
         assignment, whether by way of transfer of all or substantially all
         assets of Corixa or by merger or consolidation, that materially alters
         the rights of SB under this Agreement.  Transfer in contravention of
         this Section 15 shall be considered a material








                                      -22-
<PAGE>   23
         breach of this Agreement pursuant to Paragraph 17 (c) below.  Subject
         to other provisions of this Section 15, this Agreement and the licenses
         herein granted shall be binding upon and inure to the benefit of the
         successors in interest of the respective parties.


16.      WARRANTIES AND REPRESENTATIONS.

         (a)     Each party warrants that it has the right to enter into this
                 Agreement.

         (b)     Nothing in this Agreement shall be construed as a warranty
                 that patents covered by this Agreement are valid or
                 enforceable or that the commercialization of any product
                 covered by such patents will not infringe any patent rights of
                 Third Parties.

         (c)     Corixa acknowledges that in entering into this Agreement, SB
                 has relied or will rely upon information supplied by Corixa,
                 by Corixa's agents and/or representatives to SB pursuant to
                 confidentiality agreements between the parties and pursuant to
                 Section 11 hereof (all of such information being hereinafter
                 referred to collectively as "Product Information") and Corixa
                 warrants and represents that such Product Information has been
                 accurate in all material respects.

   
         (d)     Corixa hereby grants SB a royalty-free license or sublicense
                 under any intellectual property rights of GenQuest, Inc., a
                 Delaware corporation ("GenQuest") available to Corixa and/or
                 any intellectual property rights of Corixa to use any
                 information, reagents, teting methods, diagnostic tools and
                 similar materials developed by GenQuest and or Corixa for the
                 purpose of research and clinical development with respect to
                 Products in the Field but not, however, for any commercial
                 purpose including use of such intellectual property rights
                 directly in Product. Corixa covenants and agrees that it will
                 enter into good faith negotiations with GenQuest to seek to
                 obtain first right of negotiations for certain diagnostic uses
                 of Antigens in favor of SB.  Such negotiations would be
                 reflected in a subsequent agreement to be established between
                 SB and GenQuest.

         (e)     The parties warrant to one another that neither of them has
                 any present knowledge of the existence of any pre-clinical or
                 clinical data or information covering Product which suggests
                 that there may exist toxicity, safety and/or efficacy concerns
                 which may materially impair the utility and/or safety of
                 Product.
    

17.      TERM AND TERMINATION.
   
         (a)     Unless otherwise terminated this Agreement shall expire upon
                 the later of (i) expiration, lapse or invalidation of the last
                 to expire Corixa Patent or Joint Research Program Patent issued
                 in any country or (ii) ten (10) years after first commercial
                 sale of a Product in the last country in which a Product is
                 commercially launched.  Expiration of this Agreement under this
                 provision shall not preclude SB from continuing to market
                 Product and to use Know-How without any further royalty
                 payments.

    





                                      -23-
<PAGE>   24
         (b)     If this Agreement is terminated by Corixa for breach by SB
                 under Paragraph 17(c) hereof, all rights to all intellectual
                 property arising from the Research Program, including but not
                 limited to Corixa Patents, Joint Research Program Patents and
                 Know-How, but excluding SB Patents, shall, subject to the
                 provisions of Section 9, revert to Corixa and SB shall retain
                 no rights therein.  All payments set forth in Subparagraphs
                 5(a) (i) through (ix) will be guaranteed and non-refundable.
                 Failure by Corixa to conduct the Research Program materially
                 as detailed in Exhibit D  shall be considered a breach of
                 Agreement and be subject to Paragraph 17(c) below and any
                 amount previously paid by SB may be submitted for
                 consideration in arbitration pursuant to Section 12.

         (c)     If either party materially breaches the material provisions of
                 this Agreement and if such breach is not cured within sixty
                 (60) days (or in the case of non-payment pursuant to Sections
                 5 or 6, then fourteen (14) days) after receiving written
                 notice from the other party with respect to such breach, the
                 non-breaching party shall have the right to terminate this
                 Agreement by giving written notice to the party in breach
                 provided the notice of termination is given within six (6)
                 months of the breach and prior to cure thereof.

         (d)     SB agrees it will exercise at least the same level of diligence
                 in the clinical development and commercialization of Product
                 within the Territory  as it currently uses, or in the past has
                 used, with respect to its own commercially successful products.
                 However, prior to marketing Product in any given country, SB
                 may terminate its development efforts and the license granted
                 hereunder with respect to that country upon ninety (90) days
                 notice if in SB's reasonable judgment sales in such country
                 would not be commercially viable. Thereafter, after beginning
                 Product marketing efforts in any particular country, and
                 continuing such efforts for [***] years (the "Minimum Diligence
                 Period"), SB may terminate sales efforts with respect to any
                 single country by giving Corixa at least six (6 ) months prior
                 written notice thereof.  In that event the licence granted
                 hereunder to SB with respect to said country of the Territory
                 shall revert back to Corixa. Such Minimum Diligence Period may
                 be reduced below [***] by mutual agreement of the parties.

         (e)     Either party may terminate this Agreement if, at any time, the
                 other party shall file in any court or agency pursuant to any
                 statute or regulation of the United States or of any
                 individual state or foreign country, a petition in bankruptcy
                 or insolvency or for reorganization or for an arrangement or
                 for the appointment of a receiver of trustee of the party or
                 of its assets, or if the other party proposes a written
                 agreement of composition or extension of its debts, or if the
                 other party shall be served with an involuntary petition
                 against it, filed in any insolvency proceeding, and such
                 petition shall not be dismissed with sixty (60) days after the
                 filing thereof, or if the other party shall propose or be a
                 party to any dissolution or liquidation, or if the other party
                 shall make an assignment for the benefit of creditors.

         (f)     Notwithstanding the bankruptcy of Corixa, or the impairment of
                 performance by Corixa of its obligations under this Agreement
                 as a result of bankruptcy or



                                      -24-
<PAGE>   25



                 insolvency of Corixa, SB shall be entitled to retain the rights
                 and licenses  granted herein, without any further obligations
                 to Corixa, subject to Corixa's right to terminate this
                 Agreement for reasons other than bankruptcy or insolvency as
                 expressly provided in this Agreement.

         (g)     SB may terminate this Agreement at any time, on or after the
                 second anniversary of this Agreement by giving six (6) months
                 prior written notice to Corixa.  In the event SB terminates
                 this Agreement effective as of the second anniversary of this
                 Agreement, the Milestone Payment provided for in Paragraph
                 5(a) shall not be due regardless of whether or not the
                 Milestone has been achieved.  Thereafter, even if the
                 Milestone has been achieved, SB may still elect to terminate
                 this Agreement in which case SB shall be relieved of the
                 obligation to make the Milestone Payment.


18.      RIGHTS AND DUTIES UPON TERMINATION.

         (a)     Upon termination of this Agreement, Corixa shall have the
                 right to retain any sums already paid  by SB hereunder, and SB
                 shall pay all sums accrued hereunder which are then due,
                 which, in each case, shall include all payments under
                 Paragraph 5(a) except to the extent the Milestone Payment has
                 not become due and payable pursuant to the terms of Paragraphs
                 5(a) and/or 17(g) and to the extent such payments may be
                 considered and reviewed by the arbitrator(s) pursuant to
                 Section 12 hereof.

         (b)     Upon termination of this Agreement, SB shall notify Corixa of
                 the amount of Product(s) SB and its subsidiaries  and
                 distributors then have on hand, the sale of which would, but
                 for the termination, be subject to royalty, and SB and its
                 sublicensees and distributors shall thereupon be permitted to
                 sell that amount of Product(s), provided that SB shall pay the
                 royalty thereon at the time herein provided for.


19.      INDEMNIFICATION.

         (a)     Subject to Paragraph 19(b) hereof, from and after the
                 Effective Date, except as otherwise herein specifically
                 provided, each of the parties hereto shall defend, indemnify
                 and hold harmless the other party and its Affiliates,
                 successors and assigns, and their respective officers,
                 directors, shareholders, partners and employees from and
                 against all losses, damage, liability and expense including
                 legal fees but excluding punitive or consequential damages
                 (including lost profits) ("Damages") incurred thereby or
                 caused thereto arising out of or relating to (i) any breach or
                 violation of, or failure to properly perform, any covenant or
                 agreement made by such indemnifying party in this Agreement,
                 unless waived in writing by the indemnified party; (ii) any
                 breach of any of the representations or warranties
                 made by such indemnifying party in this Agreement; or (iii)
                 the gross negligence or willful misconduct of the indemnifying
                 party.

         (b)     If either SB or Corixa, or any Affiliate of SB or Corixa (in
                 each case an "Indemnified Party"), receives any written claim
                 which it believes is the subject of 




                                      -25-
<PAGE>   26

                 indemnity hereunder by either SB or Corixa, as the case may be
                 (in each case an "Indemnifying Party"), the Indemnified Party
                 shall, as soon as reasonably practicable after forming such
                 belief, give notice thereof to the Indemnifying Party,
                 including full particulars of such claim to the extent known to
                 the Indemnified Party; provided, however, that the failure to
                 give timely notice to the Indemnifying Party as contemplated
                 hereby shall not release the Indemnifying Party from any
                 liability to the Indemnified Party.  The Indemnifying Party
                 shall have the right, by prompt notice to the Indemnified
                 Party, to assume the defense of such claim with counsel
                 reasonably satisfactory to the Indemnified Party, and at the
                 cost of the Indemnifying Party.  If the Indemnifying Party does
                 not so assume the defense of such claim, the Indemnified Party
                 may assume such defense with counsel of its choice at the sole
                 expense of the Indemnifying Party.  If the Indemnifying Party
                 so assumes such defense, the Indemnified Party may participate
                 therein through counsel of its choice, but the cost of such
                 counsel shall be borne solely by the Indemnified Party.

         (c)     The party not assuming the defense of any such claim shall
                 render all reasonable assistance to the party assuming such
                 defense, and all out-of-pocket costs of such assistance shall
                 be borne solely by the Indemnifying Party.

         (d)     No such claim shall be settled other than by the party
                 defending the same, and then only with the consent of the
                 other party, which shall not be unreasonably withheld;
                 provided, however, that the Indemnified Party shall have no
                 obligation to consent to any settlement of any such claim
                 which imposes on the Indemnified Party any liability or
                 obligation which cannot be assumed and performed in full by
                 the Indemnifying Party.


IN WITNESS WHEREOF, each of the parties hereto has caused this Agreement to be
executed by its duly authorized officer as of the date first written above.


Agreed to and accepted by:                    Agreed to and accepted by:
CORIXA CORPORATION                            SMITHKLINE BEECHAM
                                              BIOLOGICALS
                                              MANUFACTURING S.A.




/S/ STEVEN GILLIS                             /S/ JEAN STEPHENNE
- -------------------                           -------------------------
Steven Gillis                                 Jean Stephenne
President and CEO                             Senior Vice President and
                                              General Manager



























                                      -26-

<PAGE>   27


         EXHIBIT A TO BREAST CANCER COLLABORATION AND LICENSE AGREEMENT

                                CORIXA ANTIGENS



The antigens disclosed in the following patent applications:

<TABLE>
<CAPTION>

<S>                             <C>                     <C>
Patent No./App. No.             Country                 Filing/Issue Date
- --------------------------------------------------------------------------
App. No. [***]                  [***]                   Filed [***]
Not yet assigned(2)             [***]                   Filed [***]
App. No. [***]                  [***]                   Filed [***]
App. No. [***]                  [***]                   Filed [***]
Not yet assigned(5)             [***]                   Filed [***]

</TABLE>

- ------------------
[***]



                                      -27-
<PAGE>   28


         EXHIBIT B TO BREAST CANCER COLLABORATION AND LICENSE AGREEMENT

                                 CORIXA PATENTS

<TABLE>
<CAPTION>

<S>                             <C>                     <C>
Patent No./App. No.             Country                 Filing/Issue Date
- --------------------------------------------------------------------------
App. No. [***]                  [***]                   Filed [***]
Not yet assigned(7)             [***]                   Filed [***]
App. No. [***]                  [***]                   Filed [***]
App. No. [***]                  [***]                   Filed [***]
Not yet assigned(10)            [***]                   Filed [***]

</TABLE>


The following patents, patent applications, invention disclosures, patent
applications thereon and patents issuing on any of the foregoing, including all
continuations, continuations-in-part, divisionals, additions, substitutions,
reissues, renewals and extensions of any of the foregoing, and including all
foreign counterparts of any of the foregoing, are by this listing below
excluded from Corixa Patents:


<TABLE>
<CAPTION>

<S>                             <C>                     <C>
Patent No./App. No.             Country                 Filing/Issue Date
- --------------------------------------------------------------------------
[***]
App. No. [***]                  [***]                   Filed [***]
[***]                                                   Not yet filed

[***]
Pat. No. [***]                  [***]                   Issued [***]
App. No. [***]                  [***]                   Filed [***]

[***]
Ser. No. [***]                  [***]                   Filed [***]

[***]
App. No. [***]                  [***]                   Filed [***]
App. No. [***]                  [***]                   Filed [***]

[***]
App. No. [***]                  [***]                   Filed [***]

</TABLE>

- --------------------
[***]

                                      -28-
<PAGE>   29
Patent No./App. No.           Country           Filing/Issue Date

      [***]
App. No. [***]                 [***]                  [***]

      [***]
App. No. [***]                 [***]                  [***]
App. No. [***]                 [***]                  [***]
App. No. [***]                 [***]                  [***]
App. No. [***]                 [***]                  [***]
App. No. [***]                 [***]                  [***]
App. No. [***]                 [***]                  [***]
App. No. [***]                 [***]                  [***]
App. No. [***]                 [***]                  [***]
App. No. [***]                 [***]                  [***]
App. No. [***]                 [***]                  [***]
Invention Disclosure(11)                              [***]
Invention Disclosure(12)                              [***]
































____________________________

     [***]




                                      -29-
<PAGE>   30


                                   EXHIBIT C

                        Breast Cancer Antigen Discovery


Milestone:                           [***]

                                      -30-
<PAGE>   31



                                   EXHIBIT D

        Section 1: Work Plan -- Breast Cancer Vaccine Antigen Discovery

                                     [***]

                                      -31-

<PAGE>   32
                       Exhibit D: Section 1 (Continued):

                                     [***]

                                      -32-
<PAGE>   33
                                     [***]

                                      -33-
<PAGE>   34
                                     [***]



                                      -34-



<PAGE>   35
                                     [***]



                                      -35-
































<PAGE>   36
                                   Exhibit D

     Section III: Streamlined Workplan -- Breast Cancer Antigen Discovery.

                                     [***]


                                      -36-





































- -
<PAGE>   37


                        Exhibit D: Section III (cont.):

                                     [***]




                                      








                                      -27-









































                                      

<PAGE>   1

                                                                 EXHIBIT 10.14












                       PROSTATE CANCER COLLABORATION AND
                               LICENSE AGREEMENT


                                    BETWEEN


                               CORIXA CORPORATION


                                      AND


               SMITHKLINE BEECHAM BIOLOGICALS MANUFACTURING S.A.






















                                      -1-


<PAGE>   2
                               TABLE OF CONTENTS

<TABLE>
<S>                                                                                                 <C>
 1.  DEFINITIONS                                                                                     3
 2.  SCOPE OF RESEARCH PROGRAM                                                                       8
 3.  RESEARCH PROGRAM TERM AND TERMINATION                                                           8
 4.  LICENSE GRANT                                                                                   9
 5.  LICENSE PAYMENTS                                                                               10
 6.  ROYALTIES                                                                                      12
 7.  OTHER TERMS                                                                                    15
 8.  JOINT RESEARCH TEAM                                                                            15
 9.  INVENTIONS                                                                                     16
10.  PATENTS; PROSECUTION AND LITIGATION                                                            16
11.  CONFIDENTIALITY; PUBLICITY; PUBLICATIONS                                                       18
12.  GOVERNING LAW; ARBITRATION                                                                     20
13.  MISCELLANEOUS                                                                                  21
14.  NOTICES                                                                                        22
15.  ASSIGNMENT                                                                                     22
16.  WARRANTIES AND REPRESENTATIONS                                                                 23
17.  TERM AND TERMINATION                                                                           23
18.  RIGHTS AND DUTIES UPON TERMINATION                                                             25
19.  INDEMNIFICATION                                                                                25

EXHIBIT A                                                                                           27
EXHIBIT B                                                                                           28
EXHIBIT C                                                                                           30
EXHIBIT D                                                                                           31
</TABLE>

















                                      -2-
<PAGE>   3
              PROSTATE CANCER COLLABORATION AND LICENSE AGREEMENT


This PROSTATE CANCER COLLABORATION AND LICENSE AGREEMENT (together, with the
attachments hereto, the "Agreement") is entered into the ______ day of March,
1997 (the "Effective Date") by and between CORIXA CORPORATION, a Delaware
corporation with its principal place of business located at 1124 Columbia
Street, Suite 464, Seattle, Washington 98104 ("Corixa") and SmithKline Beecham
Biologicals Manufacturing S.A., a Belgian corporation with its principal place
of business at Rue de l'Institut 89, B-1330 Rixensart, Belgium ("SB").

W I T N E S S E T H:

         WHEREAS, Corixa and SB desire to collaborate in the research and
development of antigens for the development of Vaccine product(s) for the
prevention and/or treatment of any form of prostate cancer and wish to
memorialize their agreement with respect to such collaboration in this
Agreement;

         WHEREAS, Corixa has agreed to license certain intellectual property
rights related to the subject matter of the collaboration subject to the terms
and conditions of this Agreement;

         NOW, THEREFORE, for and in consideration of the mutual observance of
the covenants hereinafter set forth and other good and valuable consideration,
the receipt of which is hereby acknowledged, the parties hereto agree as
follows:

1.       DEFINITIONS

         (a)     "Affiliate" shall mean any entity owned, owning or under
                 common ownership with a party to this Agreement to the extent
                 of at least fifty percent (50%) of the equity (or such lesser
                 percentage which is the maximum allowed to be owned by a
                 foreign corporation in a particular jurisdiction) having the
                 power to vote on or direct the affairs of the entity and any
                 person, firm, partnership, corporation or other entity
                 actually controlled by, controlling or under common control
                 with a party to this Agreement.

         (b)     "Antigens" shall mean [***]

         (c)     "PC" shall mean prostate cancer.

         (d)     "PC Field" shall mean any and all in vivo administered
                 prophylactic and/or therapeutic prostate cancer Vaccines for
                 use in humans.

         (e)     "Blocking Patents" shall mean any patents and/or patent
                 applications owned and/or controlled by Third Parties having
                 claims which would be infringed by SB making, having made,
                 using, having used, offering for sale, selling or having sold
                 all or part of 





                                      -3-
















<PAGE>   4

                 Product and which would prevent SB from using the intellectual
                 property rights granted to SB by Corixa hereunder.

         (f)     "Competition" shall mean a product which would otherwise
                 infringe Corixa Patents or Joint Research Program Patents.

         (g)     "Corixa" shall mean Corixa Corporation and its Affiliates.
   
         (h)     "Corixa Antigens" shall mean (i) those Antigens identified on
                 Exhibit A attached hereto and/or (ii) those Antigens solely
                 discovered by Corixa during the Research Program Term as may
                 be extended in connection with and as a result of the Research
                 Program and/or (iii) those Antigens discovered by Corixa as a
                 result of research directed to PC during the Research Program
                 Term as may be extended but not in connection with and not as
                 a result of the Research Program and, subject to SB's exercize
                 of the option set forth in Paragraph 4(d) below, during a
                 period of two (2) years after the Research Program Term as may
                 be extended and/or (iv) subject to SB's compliance with the
                 terms and conditions of Paragraph 4(c) below, those Antigens
                 in the PC Field licensed-in or otherwise acquired by Corixa
                 during the Research Program Term as may be extended and,
                 subject to Paragraph 4(d) below, during a period of two (2)
                 years thereafter.  As used herein, Corixa Antigens shall not
                 include Research Program Antigens nor SB Antigens.

         (i)     "Corixa Patents" shall mean all patents and patent applications
                 (including those arising from the Research Program) which are
                 now or become owned and/or controlled by Corixa during the
                 Research Program Term as may be extended and, subject to
                 Paragraph 4(d) below, during a period of two (2) years
                 thereafter and/or under which Corixa otherwise has, now or in
                 the future, the right to grant licenses, which generically or
                 specifically claim all or part of Product(s), a process for
                 manufacturing Product(s), intermediates used in such process or
                 a use of Product and any and all technology(ies) generated
                 solely by Corixa in connection with Corixa's performance under
                 this Agreement during the Research Program Term as may be
                 extended and, subject to Paragraph 4(d) below, during a period
                 of two (2) years thereafter.  Included with the definition of
                 Corixa Patents are any continuations, continuations-in-part,
                 divisions, patents of addition, reissues, renewals or
                 extensions thereof.  Also included within the definition of
                 Corixa Patents are any patent applications which generically or
                 specifically claim any improvements on Product or intermediates
                 or manufacturing processes required or useful for production of
                 Product which are developed by Corixa, or which Corixa
                 otherwise has the right to grant licenses, now or in the future
                 during the Research Program Term as may be extended and,
                 subject to Paragraph 4(d) below, during a period of two (2)
                 years thereafter. Corixa Patents shall specifically not include
                 SB Patents.  Corixa Patents in existence as of the Effective
                 Date are set forth on Exhibit B attached hereto.  Exhibit B
                 also sets forth  a list of patents owned and/or controlled by
                 Corixa which are specifically excluded from the scope of Corixa
                 Patents and shall not be considered Corixa Patents for the
                 purpose of this Agreement and to which SB shall have no rights
                 except as separately agreed by the parties in a written
                 separate agreement.
    
         (j)     "Identified" shall mean that the Know-How is described or
                 recorded in such a manner as to make it possible to verify
                 that it fulfills the criteria of secrecy and substantiality
                 and to 





                                      -4-

<PAGE>   5

                 ensure that SB is not unduly restricted in its exploitation of
                 its own technology.  To be Identified the Know-How can either
                 be set out in this Agreement or in a separate document or
                 recorded in any other appropriate form at the latest when the
                 Know-How is transferred or shortly thereafter, provided that
                 the separate document or other record can be made available if
                 the need arises.

         (k)     "Joint Inventions" shall have the meaning set forth in Section


         (l)     "Joint Research Program Patents" shall mean all patents and
                 patent applications which cover Joint Inventions and which
                 generically or specifically claim Product, a process for
                 manufacturing Product, and intermediates used in such process
                 or a use of Product and any and all technology(ies) generated
                 during the Research Program Term as may be extended.  Included
                 with the definition of  Joint Research Program Patents are any
                 continuations, continuations-in-part, divisions, patents of
                 addition, reissues, renewals or extensions thereof.  Also
                 included within the definition of Joint Research Program
                 Patents are any patent applications which cover Joint
                 Inventions and which generically or specifically claim any
                 improvements on Product or intermediates or manufacturing
                 processes required or useful for production of Product.  In no
                 event shall Joint Research Program Patents be deemed to
                 include Corixa Patents or SB Patents.

         (m)     "Joint Research Team" shall have the meaning set forth in
                 Paragraph 8(a).

         (n)     "Know-How" shall mean all technical information, materials and
                 know-how owned and/or controlled by Corixa now and/or during
                 the term of the Research Program Term as may be extended and,
                 subject to SB's exercize of the option set forth in Paragraph
                 4(d) below, during a period of two (2) years thereafter, which
                 directly relates to Product and shall include, without
                 limitation, all chemical, pharmacological, toxicological,
                 clinical, assay, control and manufacturing data and any other
                 information relating to Products and useful for the
                 development and commercialization of Products and strains,
                 samples, analytical tools, libraries, clones, etc.

         (o)     "Licensed Field" shall mean any and all in vivo administered
                 [***] cancer Vaccines for use [***] and shall [***] adoptive
                 immunotherapy. 

         (p)     "Milestone" shall mean the technical milestone set forth in
                 Exhibit C attached hereto, the satisfaction of which shall be
                 reasonably determined by the Joint Research Team within ten
                 (10) days of submission of the relevant information and data
                 by Corixa to the Joint Research Team.

         (q)     "Net Sales"

                 (i)      For purposes of this Agreement, Net Sales shall be
                          defined to mean the aggregate amounts invoiced by SB
                          or its Affiliates, licensees or sublicensees to
                          non-Affiliate Third Parties from sales of Product
                          less (i) normal customary trade discounts allowed and
                          taken; (ii) rebates to wholesalers; (iii) returns;
                          (iv) amounts for including insurance; (v) shipping
                          charges to purchasers if invoiced separately; (vi)
                          taxes (not including any income taxes), and duties
                          levied on sales; 




                                      -5-
<PAGE>   6

                          transportation(vii) deduction allowed for
                          government-mandated vaccine insurance premiums, such
                          as the National Childhood Vaccine Injury Act in the
                          U.S.; (viii) a deduction, at standard cost, for
                          special administration devices and the packaging and
                          filling thereof, such as pre-filled syringes;
                          provided, in no event shall the total of items (iii)
                          through (vi) exceed [***] of Net Sales.  Any
                          commercial use of a Product by SB (including its
                          Affiliates, licensees and sub licensees) shall be
                          considered a sale hereunder for accounting and royalty
                          purposes.

                 (ii)     In determining royalty payments hereunder, Net Sales
                          of Product shall be multiplied by [***].

                 (iii)    In the event of a product incorporating a Product and
                          one or more non-prostate cancer Vaccines (a
                          "Combination Product"), Net Sales shall exclude [***].

         (r)     "Product" shall mean any product comprised at least of one (1)
                 or more Corixa Antigens and/or Research Program Antigens,
                 including any combination thereof.  In addition to Corixa
                 Antigens and/or Research Program Antigens Product may also
                 include SB Antigen(s).

         (s)     "Research Program" shall have the meaning set forth in
                 Paragraph 2(a).

         (t)     "Research Program Antigens" shall mean Antigens discovered by
                 Corixa and SB during the Research Program Term, as may be
                 extended, in connection with and as a result of the conduct of
                 the Research Program.

         (u)     "Research Program Term" shall have the meaning set forth in
                 Paragraph 3(a).

         (v)     "SB" shall mean SmithKline Beecham Biologicals Manufacturing
                 S.A. and its Affiliates.

         (w)     "SB Antigens" shall mean Antigens discovered and/or
                 in-licensed by SB and related physical forms based on such
                 Antigens including peptides, proteins and nucleic acids other
                 than Research Program Antigens.

         (x)     "SB Patents" shall mean all patents and patent applications
                 which are now or become owned and/or controlled by SB (other
                 than jointly with Corixa) and/or under which SB
                 otherwise has, now or in the future, the right to grant
                 licenses, which generically or specifically claim any Antigen
                 and/or adjuvant included in Product.  Included with the
                 definition of SB Patents are any continuations,
                 continuations-in-part, divisions, patents of 




                                      -6-
<PAGE>   7
                 addition, reissues, renewals or extensions thereof.  In no
                 event shall SB Patents be deemed to include either Corixa
                 Patents or Joint Research Program Patents.

         (y)     "Secret" shall mean that the Know-How as a body or in the
                 precise configuration and assembly of its components is not
                 generally known or easily accessible, so that part of its
                 value consists in the lead-time SB gains when it is
                 communicated to it; Know-How is not limited to the narrow
                 sense that each individual component of the Know-How should be
                 totally unknown or unobtainable outside the Corixa's business.

         (z)     "SPC" shall mean all Supplementary Protection Certificates for
                 medicinal products and their equivalents provided under the
                 Council Regulation (EEC) N# 1768/92 of June 18, 1992.

         (aa)    "Substantial" shall mean that the Know-How includes
                 information which is of importance for the whole or a
                 significant part of (i) a manufacturing process or (ii) a
                 product or service, or (iii) for the development thereof and
                 excludes information which is trivial.  Such Know-How must
                 thus be useful, i.e., can reasonably be expected at the date
                 of conclusion of the Agreement to be capable of improving the
                 competitive position of SB, for example by helping SB to enter
                 a new market or giving SB an advantage in competition with
                 other manufacturers or providers of services who do not have
                 access to the licensed Secret Know- How or other comparable
                 Secret know-how;

         (bb)    "Territory" shall mean all the countries of the world.

         (cc)    "Third Party(ies) shall mean any party other than a party to
                 this Agreement or an Affiliate.

         (dd)    "Vaccines" shall mean the administration of [***] any
                 formulation or configuration, for the primary purpose and
                 effect of eliciting a [***] or [***] immune response directed
                 directly or indirectly to such [***] contained therein.
                 [***]

         "Interpretive Rules". For purposes of this Agreement, except as
         otherwise expressly provided herein or unless the context otherwise
         requires : (a) defined terms include the plural as well as the singular
         and the use of any gender shall be deemed to include the other gender;
         (b) references to "Articles", "Sections" and other subdivisions and to
         "Schedules" and "Exhibits" without reference to a document, are to
         designated Articles, Sections and other subdivisions of, and to
         Schedules and Exhibits to, this Agreement; (c) the use of the term
         "including" means "including but not limited to"; and (d) the words
         "herein", "hereof", "hereunder" and other words of similar import refer
         to this Agreement as a whole and not to any particular provision.




                                      -7-

<PAGE>   1
                                                                 EXHIBIT 10.15


                  RESEARCH COLLABORATION AND LICENSE AGREEMENT

         RESEARCH COLLABORATION AND LICENSE AGREEMENT, dated as of November 1,
1995, between CORIXA CORPORATION, a Delaware corporation ("Corixa"), and
CELLPRO, INCORPORATED, a Delaware corporation ("CellPro").

                                    RECITALS

         A. Corixa possesses scientific expertise, proprietary information and
biological materials related to tumor antigens, microsphere antigen delivery,
adjuvants and other technologies helpful in stimulation, activation and ex vivo
propagation of T-cells for adoptive immunotherapy.

         B. CellPro has expertise in cell separation and tissue culture
technology.

         C. CellPro and Corixa desire to collaborate on the development of
antigens, delivery technology and adjuvants for ex vivo T-cell propagation for
adoptive immunotherapy of cancer and desire that products based on such
therapeutic technology be marketed by CellPro.

                                    AGREEMENT

1. DEFINITIONS

         As used in this Agreement:

         1.1 "AFFILIATE" means any business entity that controls, is controlled
by, or is under common control with another corporation or business entity. The
direct or indirect ownership of at least fifty percent (50%) or, if smaller, the
maximum allowed by applicable law, of the voting securities or an interest in
the assets, profits or earnings of a business entity shall be deemed to
constitute control of the business entity.

         1.2 "CANCER", which is synonymous with neoplasia or malignancy, means
those groups of diseases characterized by the malignant growth of tissues or
cells within the body or conditions closely related to such growth identifiable
as precursor lesions for malignancy.

         1.3 "CELLPRO CARVE-OUT" means an amount to be deducted from the sales
price of each Licensed Product in determining the Net Sales Price, which amount
shall be the lesser of (a) $[***], (b) [***], or (c) [***] ([***]%) of the gross
amount paid by unaffiliated third parties to CellPro or its sublicensee for a
Licensed Product.

                                      -1-


<PAGE>   2

         1.4 "CELLPRO FIELD" means the adoptive immunotherapy of Cancer [***].

         1.5 "CELLPRO TECHNICAL FIELD" means the activities of:

         (a) [***], and

         (b) [***].

         1.6 "CELLPRO TECHNOLOGY" means all Technology owned or controlled by
CellPro, including, without limitation, all Technology covered by the patents
and patent applications identified on Schedule 1.6.

         1.7 "COMPETITIVE PRODUCT" means a third-party product or service that
is sold in a country where any Licensed Product is sold and that would infringe
any claim (whether or not valid) under any patent in any other country held by
Corixa or its licensors covering any of the Corixa Technology used in such
Licensed Product.

         1.8 "CONFIDENTIAL INFORMATION" means information and materials
(biological, chemical or otherwise) that are either marked as confidential or
not generally known or available outside CellPro or Corixa and information and
materials entrusted to CellPro or Corixa by third parties. Confidential
Information may include, without limitation, trade secrets, confidential
knowledge, ideas, biological materials, chemical materials, information about
biological or chemical materials, any information that may relate to Technology,
the Research Program, research, development, manufacturing, business plans,
personnel, purchasing, financial data, marketing or selling. Confidential
Information may include or be contained in materials such as drawings, samples,
prototypes, data, procedures, specifications, reports, studies, customer or
supplier lists, budgets, cost or price lists, compilations or computer programs,
or may be in the nature of unwritten knowledge or know-how.

         1.9 "CORIXA FIELD" means any [***] other
than the CellPro Field and the CellPro Technical Field. Corixa Field includes,
without limitation, the discovery and development of [***].

         1.10 "CORIXA TECHNOLOGY" means all Technology owned or controlled by
Corixa, including, without limitation, all Corixa Technology covered by the
patents and patent applications identified on Schedule 1.10, Improvements made
by Corixa and Corixa's Sole Patent Rights.

         1.11 "FIRST RIGHT PERIOD" means the period beginning on the date of
this Agreement and ending on the last day of the Research Term, provided that
CellPro may, at its option, extend the First Right Period from year to year by
delivering written notice of each 

                                      -2-

<PAGE>   3

extension to Corixa and paying Corixa [***] (U.S.$[***]) for each extension year
at least thirty (30) days prior to the beginning of the applicable extension
year.

         1.12 "IMPROVEMENT" means all discoveries, developments, designs,
inventions, technology and know-how, whether patentable or nonpatentable, made,
conceived or reduced to practice as a result of the Research Program.

         1.13 "JOINT KNOW-HOW RIGHTS" means all proprietary rights, other than
the Joint Patent Rights, in that portion of the Technology that is made,
conceived or reduced to practice by one or more employees or agents of CellPro
and one or more employees or agents of Corixa in performing the Research
Program.

         1.14 "JOINT PATENT RIGHTS" means all patents and inventors'
certificates and applications therefor throughout the world, including any
renewal, division, continuation or continuation-in-part of any such applications
and any patents issuing thereon, and any reissues, extensions, substitutions,
confirmations, registrations, revalidations, revisions and additions of or to
any such patents, to the extent that such patents, inventors' certificates and
applications relate to that portion of the Technology that is made, conceived or
reduced to practice by one or more employees or agents of CellPro and one or
more employees or agents of Corixa in performing the Research Program, and as to
which such employees or agents would be inventors under United States patent
laws.

         1.15 "JOINT RESEARCH COMMITTEE" shall have the meaning assigned to that
term in Section 2.4.

         1.16 "LICENSED PRODUCT" means any product or service comprised at least
in part of Corixa Technology sold for use in the CellPro Field.

         1.17 "LIQUID TUMOR THERAPY" means adoptive immunotherapy of acute
myelogenous leukemia, acute lymphocytic leukemia, chronic myelogenous leukemia,
chronic lymphocytic leukemia, hairy cell leukemia, and myeloma.

         1.18 "NET SALES PRICE" means the gross amount received by CellPro or
its sublicensees for the sale or other disposition of a Licensed Product to an
unaffiliated third party less the following reasonable deductions for amounts
actually incurred related to the sale or other disposition:

         (a) normal, customary trade discounts (including volume discounts),
credits and rebates and allowances and adjustments for rejections, recalls or
returns;

         (b) freight, insurance, sales, use, excise, value-added and similar
taxes or duties imposed on the sale and included in the gross amount charged;
and

                                      -3-


<PAGE>   4

         (c) the CellPro Carve-Out (except in the case of a sale or other
disposition by a sublicensee of a Licensed Product that contains no CellPro
Technology);

provided that, in no event shall the total of item (a) exceed [***] percent
([***]%) of Net Sales Price. Any Licensed Product sold or otherwise disposed of
by CellPro or its sublicensees to an unaffiliated third party in other than an
arm's-length transaction or for other property (e.g., barter) shall be deemed
invoiced at its fair market value (determined as the average CellPro selling
price for arm's-length transactions) in the country of sale or disposition. "Net
Sales Price" shall exclude any amount included in Sublicense Fees, reasonable
quantities of Licensed Products given away for promotional, research (subject to
the terms hereof) or clinical trial purposes or revenues derived from reasonable
quantities of Licensed Products supplied for clinical research (subject to the
terms hereof) on a cost-reimbursement basis.

         1.19 "PRODUCT CANDIDATES" means the physical embodiment of any
Technology related to the CellPro Field, [***].

         1.20 "RESEARCH PROGRAM" has the meaning assigned to that term in
Section 2.1.

         1.21 "RESEARCH TERM" shall have the meaning assigned to that term in
Section 2.3.

         1.22 "ROW" means all the countries of the world other than the United
States and its possessions, Japan or the countries of the European Economic
Community.

         1.23 "ROYALTY PERIOD" means for each Licensed Product, on a
country-by-country basis, that period commencing on the date hereof and expiring
on the later of (a) the date of expiration of the last to expire in such country
of any patents with Valid Claims covering such Licensed Product, or (b) [***]
after the first commercial sale by CellPro to an unaffiliated third party
following regulatory approval of such Licensed Product in such country.
Notwithstanding the above, if a Valid Claim has not issued within [***]
of filing for patent protection therefore, the Royalty Period will be limited to
the period provided in part (b), above.

         1.24 "SOLE PATENT RIGHTS" means, all rights of a party (other than
rights in Joint Patent Rights) in its patents and inventors' certificates and
applications therefor throughout the world, including any renewal, division,
continuation or continuation-in-part of any such applications and any patents
issuing thereon, and any reissues, extensions, substitutions, confirmations,
registrations, revalidations, revisions and additions of or to any such patents,
to the extent that such patents, inventors' certificates and applications relate
to the Technology.

         1.25 "SUBLICENSE FEES" means the fair market value of all
consideration, both monetary and nonmonetary, paid to CellPro pursuant to any
sublicense of the Corixa Technology, such [***], but excluding [***].

                                      -4-


<PAGE>   5
         [***] 

         1.26 "TECHNOLOGY" means all discoveries, developments, designs,
inventions, technology and know-how, whether patentable or nonpatentable, that
is (a) currently or at any time during the Research Term [***], or (b) made,
conceived or reduced to practice [***].

         1.27 "VALID CLAIM" means a claim of an issued, unexpired patent which
has not been (a) held invalid or unenforceable by a final decision of a court or
governmental agency of competent jurisdiction, which decision is unappealable or
was not appealed within the time allowed therefor, or (b) admitted in writing to
be invalid or unenforceable by the holder(s) by reissue, disclaimer or
otherwise.

2. COLLABORATION

         2.1 RESEARCH PROGRAM.

         (a) The parties shall perform a collaborative research program to [***]
useful in adoptive immunotherapy of Cancer (the "Research Program"), in
accordance with the plan set forth on Schedule 2.1, as amended from time to
time. The objective of the Research Program will be to develop commercial
products which combine CellPro's cell separation and culture technology with
Corixa's knowledge and access to proprietary tumor antigens, antigen delivery
systems and adjuvants. The Research Program will involve: (1) [***]; (2) [***];
(3) [***] and (4) [***].

         (b) CellPro will supply Corixa with the [***].

                                      -5-


<PAGE>   6
[***] In turn, Corixa will supply CellPro with [***] used in the Research
Program, as well as [***] used in the Research Program. The following list of
[***] is meant to be illustrative, rather than all-inclusive: [***].

         (c) During the Research Term, each party shall use reasonable and
diligent efforts to execute the Research Program, including, without limitation,
staffing the Research Program with sufficient personnel to reasonably meet its
objectives. Corixa will commit at least [***] full-time equivalents to the
Research Program in the first year. At CellPro's direction, the research plan
shall be revised and updated each year by the Joint Research Committee, subject
to CellPro's reasonable revisions prior to completion of the research plan (as
long as such revisions are consistent with this Agreement and within Corixa's
reasonable capabilities). The research plan shall not materially increase the
proposed staffing levels of either party from year to year without that party's
written consent. On or before September 30 of each year the parties shall
complete and attach a copy of the next year's revised plan hereto as an
amendment to Schedule 2.1. Neither party may have its obligations under the
Research Program performed by any third party without first informing the other
party of its intent to do so and obtaining an assignment or fully paid,
exclusive (in the CellPro Field), worldwide license (with right to sublicense)
without further royalty to CellPro and Corixa of any rights such third party and
any other third party may have in any intellectual property arising from or
relating to any such third party performance. During the term of this Agreement,
the parties may, subject to Section 3.2, conduct research and development, by
themselves or with others, outside and independent of the Research Program,
retaining all rights resulting from such efforts except as specifically stated
otherwise in this Agreement.

         2.2 FUNDING.

                (a) Prior to the beginning of each three (3) month period during
the Research Term, CellPro shall pay Corixa at least [***] ($[***]). The actual
funding amount for the first year has been established as [***] ($[***]). For
each year after the first year, the actual funding amount shall be established
annually on or before the September 30 immediately preceding the applicable year
by the Joint Research Committee and shall be an amount reasonably necessary to
cover Corixa's fully-burdened expenses incurred in meeting its obligations under
the Research Program; provided, however, that if any annual extension occurs
after the initial Research Term, minimum Research Program funding payable by
CellPro to Corixa shall be [***] ([***]%) of the prior year's minimum funding.

                (b) The parties hereby acknowledge that the minimum payment for
the three (3) month period beginning November 1, 1995 was made by CellPro to
Corixa on October 31, 1995.

                                      -6-


<PAGE>   7

   
         2.3 TERM. The initial term of the Research Program shall be three (3)
years commencing November 1, 1995 (the "Research Term"). Thereafter, the
Research Term may be extended annually for up to five (5) additional years at
CellPro's option, which option shall be exercised by CellPro giving written
notice of renewal at least six (6) months prior to the end of the then-current
Research Term.
    

         2.4 JOINT RESEARCH COMMITTEE. The Research Program shall be designed,
directed and monitored by a committee composed of representatives of each party
(the "Joint Research Committee"). The Joint Research Committee shall be
comprised of four (4) members, two (2) members appointed by each of the parties.
Karen Auditore-Hargreaves and Ken Grabstein shall be members and project leaders
of the Joint Research Committee. The project leaders shall be the primary
contacts between the parties with respect to the Research Program. Each party
may replace its project leader at any time after conferring with the other
party, but shall not do so without good reason if the other party objects.
During the Research Term, the Joint Research Committee shall meet at least
quarterly, and at such times and locations as determined by the Joint Research
Committee. Any disagreement among members of the Joint Research Committee shall
first be resolved within the Joint Research Committee with any resolution
targeting the efficient achievement of the stated objectives of the Research
Program. In the event the members maintain their disagreement, either party may
ask for resolution by the respective chief executive officers of Corixa and
CellPro. If the chief executive officers do not resolve the disagreement, either
party may seek resolution in accordance with Section 13.

         2.5 RESEARCH RECORDS AND REPORTS.

                  (a) Corixa and CellPro each shall maintain or cause to be
maintained complete and accurate records in sufficient detail and in good
scientific manner appropriate for patenting and product certification or
registration purposes, which records fully and properly reflect all work done
and results achieved by them in the performance of the Research Program
(including all data in the form required to be maintained pursuant to any
applicable laws and regulations). Such records shall be Confidential Information
of the parties.

                  (b) Corixa and CellPro shall have the right, during normal
business hours and upon reasonable notice, to inspect and copy any records of
the other party prepared pursuant to Section 2.5(a). Each party shall maintain
such records and the information of the other party contained therein in
confidence in accordance with Section 7 and shall not use such records or
information except to the extent otherwise permitted by this Agreement.

                  (c) Each party shall keep the other party fully and promptly
informed as to all of its discoveries and technical developments under the
Research Program. The Joint Research Committee shall prepare and distribute to
each party's chief executive officer a detailed written report describing
progress toward the goals of the Research Program on the first business day of
each April and October during the Research Term.

                                      -7-


<PAGE>   8

         2.6 VISIT OF FACILITIES; AVAILABILITY OF EMPLOYEES. Representatives of
Corixa and CellPro may, upon reasonable notice during normal business hours, (a)
visit the facilities where the Research Program is being conducted, (b) consult
informally, during such visits and by telephone, with personnel of the other
party performing work on the Research Program, and (c) with the other party's
prior approval, which approval shall not be unreasonably withheld, visit the
sites of any experiments being conducted by the other party in connection with
the Research Program. If requested by the other party, Corixa and CellPro shall
cause appropriate individuals working in connection with the Research Program to
be available for meetings at the location of the facilities where such
individuals are employed at times reasonably convenient to the party responding
to such request.

3. LICENSES

         3.1 LICENSE TO CELLPRO.

                  (a) Corixa hereby grants to CellPro a worldwide license in the
CellPro Field, with the right to sublicense, exclusive except as to Corixa (and,
pursuant to Section 2.1, any third party performing Corixa's obligations under
the Research Program), to use the Corixa Technology for research and
development: (i) in accordance with the Research Program during the Research
Term, (ii) in its own independent research and development in the CellPro Field
and (iii) in collaboration with third parties in the CellPro Field (provided
that CellPro will not grant any right or sublicense to the Corixa Technology
except under a sublicense granted in accordance with Section 3.3).

                  (b) Corixa hereby grants to CellPro a worldwide license, which
license shall be exclusive to CellPro (even as to Corixa) in the CellPro Field,
with the right to sublicense, under the Corixa Technology to make, have made,
use, sell and have sold Licensed Products.

         3.2 LICENSE TO CORIXA

         CellPro hereby grants to Corixa a nonexclusive license to use the
CellPro Technology for research and development only in accordance with the
Research Program during the Research Term.

         3.3 SUBLICENSING.

                  (a) Notwithstanding anything herein to the contrary, CellPro
shall not sublicense any rights to Corixa Technology unless the sublicensee
agrees to be bound by the applicable terms hereof (e.g., confidentiality,
indemnity, etc.).

                  (b) In granting a sublicense to Corixa Technology hereunder,
CellPro shall notify Corixa of the scope of the sublicense, the sublicensee's
identity, and all consideration received from such sublicensee, CellPro shall
remain responsible for the sublicensee's compliance with the terms of this
Agreement.

                                      -8-


<PAGE>   9

                  (c) Each CellPro sublicense hereunder shall allocate to
Sublicense Fees that portion of the total consideration owing to CellPro under
such sublicense as is reasonable and customary in the industry.

         3.4 TERMINATION OF THIRD PARTY LICENSES.

         If the Joint Research Committee determines that any of the Corixa
Technology licensed to Corixa pursuant to a third party license agreement has
insignificant scientific or economic value, then Corixa may terminate such third
party license agreement without recourse by CellPro, and upon such termination
CellPro's rights to such Corixa Technology hereunder shall cease.

4. ADDITIONAL FIELDS

         4.1 NEGOTIATION RIGHT.

         If technology outside the CellPro Field, but in the field of ex vivo
cell therapy, becomes available to Corixa during the First Right Period, Corixa
shall promptly but in no event later than [***] after its availability to
Corixa, notify CellPro of such potential additional application(s) (the date of
such notice is referred to in this Section 4 as the "Notice Date"). Within [***]
after the Notice Date, CellPro shall notify Corixa whether or not it is
interested in pursuing negotiations with Corixa to expand the CellPro Field to
include any such additional applications. Notwithstanding the foregoing, if
CellPro notifies Corixa that it cannot reasonably assess such opportunity within
the [***] period, Corixa shall extend such period by up to another [***] to
allow CellPro to complete its due diligence. If CellPro notifies Corixa of its
interest in such application(s), the parties shall negotiate in good faith for
[***] the terms and conditions of such expansion of the CellPro Field. If at the
end of such [***] period, the parties have not, despite good faith efforts to
reach agreement, agreed upon all terms and conditions for such expansion of the
CellPro Field, Corixa shall be free to exploit such new application(s) outside
of this Agreement except as set forth in Sections 4.2 and 4.3.

         4.2 RIGHT OF FIRST REFUSAL-[***] APPLICATIONS.

         During the [***] following the Notice Date, Corixa will not enter into
any license or similar transaction with a third party regarding such technology
for [***] applications unless Corixa has first offered to enter into such
transaction with CellPro, as follows:

               (a) Before entering into any such transaction with a third party,
Corixa will deliver to CellPro a written offer setting forth a reasonably
detailed description of the technology that is subject to the proposed
transaction, a description of the type of proposed transaction and a description
of all the material terms and conditions applicable to the transaction.

                                      -9-


<PAGE>   10

                  (b) Within [***] after CellPro receives such offer,
CellPro may elect, at its option, to enter into the transaction described in the
offer.

                  (c) If CellPro does not elect to enter into such transaction,
Corixa may enter into the transaction in accordance with the terms of its offer.
If there is any material change in the terms of the transaction from the terms
set forth in the offer, Corixa will offer the transaction to CellPro again, with
such revised terms, in accordance with this Section 4.

         4.3 OTHER APPLICATIONS.

         During the [***] period following the Notice Date, Corixa will not make
an initial offer to any third party of any technology in the field of ex vivo
cell therapy for applications other than [***] applications on terms which are,
on balance, more favorable to such third party then the terms rejected by
CellPro under Section 4.1. If, however, Corixa accepts a proposal made by a
third party or modifies a proposal made to a third party in response to good
faith negotiations with such third party, Corixa is not obligated to offer such
technology to CellPro prior to entering into the arrangement with the third
party.

5. COMMERCIALIZATION

         5.1 DEVELOPMENT. CellPro shall have the right in its sole discretion,
but without the obligation, to select Product Candidates for development and
shall give prompt notice to Corixa of each such selection. CellPro, at its sole
expense, shall conduct such preclinical and human clinical trials as CellPro
determines are necessary or desirable to obtain regulatory approvals to
manufacture and market Licensed Products and shall develop, seek necessary
approval to market, commence marketing and market Licensed Products.

         5.2 DEVELOPMENT INFORMATION. CellPro shall keep Corixa informed as to
the progress of the development of all Product Candidates under this Agreement
and the filing and obtaining of the approvals necessary for marketing. Once
CellPro has selected a Product Candidate and proceeded with the development
thereof, then within thirty (30) days after the end of each calendar year
period, CellPro shall provide to Corixa a reasonably detailed written report
describing the progress of the development of the Product Candidate.

         5.3 DILIGENCE IN DEVELOPMENT AND COMMERCIALIZATION. CellPro shall
exercise at least the same level of diligence in the clinical development and
commercialization of Licensed Products as it currently uses, or in the past has
used, with respect to its own commercially successful products.

         5.4 MANUFACTURING.

                  (a) CellPro shall, at its sole expense, manufacture or have
manufactured, all Licensed Products. Substantially all of each Licensed Product
sold in the United States shall be manufactured in the United States. In the
event CellPro desires that Corixa 

                                      -10-


<PAGE>   11

manufacture or supply any Licensed Product, CellPro and Corixa shall negotiate
in good faith an agreement for the supply of such Licensed Product. Corixa
shall, at CellPro's expense, at all times make available and shall cause other
licensees of Corixa Technology and other collaborators in the Research Program
to make available to CellPro, its sublicensees and to the United States Food and
Drug Administration ("FDA") and similar agencies at the United States level and
at various international levels, solely for the purposes of seeking or
maintaining regulatory approval, any and all information requested or required
by CellPro or such agencies in connection with CellPro's development or
licensure of any Product Candidate or CellPro's licensure, manufacture or sale
of any Licensed Product. CellPro shall, at Corixa's expense, at all times make
available and shall cause its sublicensees of the Corixa Technology to make
available to Corixa, its licensees and sublicensees and to the FDA and similar
agencies at the United States level and at various international levels, solely
for the purpose of seeking or maintaining regulatory approval any and all
information requested or required by Corixa or such agencies in connection with
Corixa's development, manufacturing, license or sale of any product that
incorporates the Corixa technology. The requirement to make such information
available includes, without limitation enabling each party to cross reference
any file (i.e., DMF BMF, IND, IDE and their foreign counterparts) with the
agencies described above which contains such information.

                  (b) CellPro shall be the holder of any filing with or approval
granted by any regulatory body applicable to any Licensed Product. Each of
CellPro and Corixa shall comply with all health registration laws, regulations
and orders of any government entity applicable to the Licensed Products,
including the provision of information by Corixa to CellPro to comply with FDA
or other governmental reporting requirements.

                  (c) Either party shall advise the other party, by telephone or
facsimile, within such time as required by the FDA or foreign equivalent (with
respect to the severity of such adverse reaction) after it becomes aware of any
reportable adverse reaction from the use of any Product Candidate or Licensed
Product. Such advising party shall provide the other party with a written report
delivered by confirmed facsimile or any reported adverse reaction, stating the
full facts known to it, including but not limited to customer name, address,
telephone number and lot or serial number as appropriate.

                  (d) CellPro and Corixa each shall notify the other promptly if
any Licensed Product is alleged or proven to be the subject of a recall, market
withdrawal or correction, and the parties shall cooperate in the handling and
disposition of any such recall, market withdrawal or correction; provided,
however, in the event of a disagreement as to any matters related to such
recall, market withdrawal or correction, CellPro shall have final authority.
CellPro shall bear the cost of all recall, market withdrawal or correction of a
Licensed Product.

                                      -11-


<PAGE>   12

6. ROYALTY AND MILESTONE PAYMENTS

                  6.1 ROYALTIES.

                  (a) CellPro shall pay Corixa the following royalty on the
cumulative, worldwide Net Sales Price of Licensed Products during the Royalty
Period, without regard to indications, dose form, unit size, or other
attributes:

<TABLE>
<CAPTION>
                Cumulative
                Net Sales Price During
                Calendar Year                        Royalty Rate
                ----------------------               ------------
                <S>                                       <C>   
                
                $[***] to $[***]                        [***]%

                Above $[***]                            [***]%
                and at or below
                $[***]

                Above $[***]                            [***]%
</TABLE>

For example, if the cumulative Net Sales Price of all Licensed Products sold
during a calendar year is $[***], the total royalties to be paid would
equal $[***] (i.e., [***]% of $[***] plus [***]% of $[***]).

                  (b) CellPro shall pay to Corixa annually a minimum royalty of
[***] (U.S.$[***]) for each of the United States and the European Economic
Community which respective minimums shall commence [***] after receipt of
regulatory approval for commercial sale of a Licensed Product in each such area.
CellPro shall pay to Corixa annually a minimum royalty of [***] (U.S.$[***]) in
the aggregate for Japan and ROW, treated as a whole, which minimum shall
commence [***] after receipt of regulatory approval for commercial sale of a
Licensed Product in Japan. Amounts owing annually pursuant to Section 6.1(a)
shall be applied against such minimum royalty payment. Any amount creditable
against royalties as defined in Section 6.1(d) below may be applied against any
such minimum royalties due.

                  (c) Each sale of a Licensed Product will be subject to a
single royalty payment hereunder regardless of whether the Licensed Product or
its manufacture, use or sale is covered by more than one Valid Claim included in
a licensed patent or more than one patent in the licensed patents.

                  (d) [***] ([***]%) of the milestone payments for a Licensed
Product payable pursuant to Section 6.3 (excluding [***] and all license fees
paid as described in Section 6.5 shall be creditable against future royalties
due hereunder on the Licensed Products, provided that in no event shall
royalties paid to Corixa 

                                      -12-


<PAGE>   13

be so reduced by more than [***] ([***]%) of the otherwise payable royalty and
that such [***]% offset shall not apply to the minimum royalties due pursuant to
Section 6.1(b). Any uncredited portion shall be carried forward for credit in
subsequent years.

                  (e) Royalties shall be paid to Corixa in U.S. Dollars within
forty-five (45) days after the end of each calendar quarter with respect to
sales of Licensed Products accruing during such quarter. With each royalty
payment CellPro shall deliver to Corixa a statement setting forth by country and
Licensed Product the sales during the quarter and a calculation of the royalties
due thereon. Sales may be invoiced in the currency of the invoicing company
("Functional Currency") or in the local currency of the customer. When a sale is
invoiced in local currency, the individual transaction must first be converted
to the Functional Currency in accordance with Generally Accepted Accounting
Principles. Where the Functional Currency is not U.S. Dollars, the monthly sales
amounts will be translated to U.S. Dollars by using an average rate of exchange.
This average will be computed using the rate of exchange quoted under Foreign
Exchange in The Wall Street Journal as of the end of the current month plus the
rate as of the end of the prior month and dividing by 2.

                  (f) Notwithstanding the foregoing, CellPro shall pay royalties
at only [***] ([***]%) of the applicable royalty rate set forth in Section
6.1(a), on those sales of any Licensed Product for which at the time and in the
country of sale (i) such Licensed Product is not covered by a Valid Claim and
(ii) a third party is selling a Competitive Product. CellPro shall pay royalties
at [***] ([***]%) of the applicable royalty rate set forth in Section 6.1(a) on
those sales of any Licensed Product for which (i) at the time and in the country
of manufacture, the Licensed Product is not covered by a Valid Claim and (ii) at
the time and in the country of sale to the end user the Licensed Product is not
covered by a Valid Claim.

         6.2 THIRD-PARTY ROYALTIES AND FEES.
   

                  (a) All third-party royalties and all non-royalty obligations
which may become due with respect to the intellectual property listed on
Schedule 1.10 or otherwise owned or controlled by Corixa- on the date of this
Agreement shall remain Corixa's sole responsibility. A complete list of the
foregoing third parties obligations is set forth on Schedule 6.2(a). In
addition, if Corixa executes a license agreement with GenQuest, Inc. for
technology consisting of [***] in the CellPro Field, such technology will become
part of the Corixa Technology, and Corixa shall be responsible for all royalty
and non-royalty obligations under such license agreement. In the event the Joint
Research Committee determines that a license from a third party (not an
Affiliate of CellPro) is necessary to develop or market a Licensed Product, then
Corixa shall, subject to CellPro's agreement to the terms thereof, use
commercially reasonable efforts to negotiate an agreement with such third party
for such license. Except as set forth in paragraph 6.2(b), any resultant
third-party royalties due under such license for CellPro's sales of Licensed
Products during a calendar quarter shall be paid by CellPro in addition to the
royalties owing to Corixa 
    

                                      -13-


<PAGE>   14

hereunder. Any obligations to pay license, milestone or option fees under such
third-party license that are applicable to the CellPro Field shall be shared
equally by CellPro and Corixa.

                  (b) Any royalties due with respect to Licensed Products under
a license entered into under Section 11.4(c) with respect to the [***]
technology described in Schedule [***] (the "[***] Technology") shall be [***].
Any portion of royalties due under a license of the [***] Technology that are
[***] of the Net Sale Price shall be [***]. Any obligations to pay
license-related fees shall be borne by Corixa.

         6.3 MILESTONE PAYMENTS. CellPro shall pay Corixa the following amounts
within thirty (30) days after the occurrence of the event indicated:

<TABLE>
<CAPTION>
       Event                                                      Amount
       -----                                                      ------
       <S>                                                       <C>  

       As to the first Licensed Product, commencement of the     $[***] 
       first CellPro (or its sublicensee) sponsored clinical 
       trial.

       As to the first Licensed Product, commencement of the     $[***] 
       first CelllPro (or its sublicensee) sponsored phase III 
       clinical trial.

       As to the first Licensed Product, regulatory approval     $[***] 
       in the United States, Japan or the European Economic 
       Community..

       Commencement of the earlier of a CellPro (or its           $[***]
       sublicensee) sponsored phase III clinical trial for (i)
       the second Licensed Product or (ii) the second
       significant indication of the first Licensed Product.

       The earlier of regulatory approval in the United
       States, Japan or the European Economic Community for       $[***]
       (i) a significant indication of the second Licensed
       Product or (ii) the second significant indication for
       the first Licensed Product.
</TABLE>

         6.4 SUBLICENSE FEES. CellPro shall pay to Corixa [***] ([***]%) of all
Sublicense Fees received prior to [***] and [***] ([***]%) of all Sublicense
Fees received after [***].

                                      -14-


<PAGE>   15

         6.5 PREPAID LICENSE FEE. CellPro shall pay [***] ($[***]) to Corixa
within two (2) weeks after the date on which the last of the parties has
executed this Agreement [***]. Such fee shall be allocated by Corixa as set
forth on Schedule 6.5 [***].

         6.6 METHOD OF PAYMENT. All payments owing by CellPro to Corixa shall be
made by wire transfer of immediately available funds in accordance with wiring
instructions provided by Corixa to CellPro from time to time.

         6.7 BOOKS AND RECORDS.

                  (a) CellPro shall keep, and shall cause its Affiliates and
sublicensees to keep, accurate books and records in sufficient detail to verify
the calculation of Net Sales Price and royalties and the accuracy of the royalty
reports hereunder, such books and records being retained at a principal place of
business for at least thirty-six (36) months after the end of the year to which
they pertain.

                  (b) Upon the written request of Corixa, CellPro shall permit
an independent certified public accounting firm of nationally recognized
standing, selected by Corixa, to have access during normal business hours to
such of the records as may be reasonably necessary solely to verify the
calculation of Net Sales Price and royalties and the accuracy of the royalty
reports hereunder for any year ending not more than thirty-six (36) months prior
to the date of such request. If the accounting firm concludes that additional
royalties were owed during the audited period, CellPro shall pay the additional
royalties within thirty (30) days after the date Corixa delivers to CellPro such
accounting firm's written report so concluding. The fees charged by such
accounting firm shall be paid by Corixa; provided, however, that if an audit
discloses that the royalties payable by CellPro for such audited period are more
than [***] ([***]%) of the royalties actually paid for such period, then CellPro
shall pay the reasonable fees and expenses charged by the accounting firm. If
such audit discloses that CellPro has paid royalties in excess of the amount
due, then Corixa will credit such excess amount to future royalties owed by
CellPro hereunder; provided that in no event shall royalties paid to Corixa be
so reduced by more than [***]% and that such [***]% offset shall not apply to
the minimum royalties due pursuant to Section 6.1(b).

                  (c) Corixa shall treat all financial information subject to
review under this Section 6.7 or under any sublicense agreement as confidential
and shall cause its accounting firm to retain all such financial information in
confidence.

         6.8 VALUE OF COLLABORATION AND KNOW HOW. CellPro acknowledges that
Corixa's participation and work in the Research Program may be of Substantial
value to CellPro, including lead-time gained by CellPro as a result, and that
the Know-How included in the Corixa Technology have been Identified and
constitute valuable and Substantial Secrets and know-how of Corixa. The parties
acknowledge and agree that, for their mutual 

                                      -15-


<PAGE>   16

convenience and after considering other alternatives, including an initial
noncreditable, upfront payment, the payments to Corixa set forth in this
Agreement, including the structure and timing of royalty payments, are an
appropriate and mutually convenient way of compensating Corixa. For the purposes
of this Section 6.8, the following terms have the following specified meanings:

         "Know-How" shall mean all technical information, materials and know-how
owned and/or controlled by Corixa now and during the term of this Agreement that
relates to the CellPro Field and shall include, without limitation, all
chemical, pharmacological, toxicological, clinical, assay, control and
manufacturing data and any other information relating to the CellPro Field and
useful for the development and commercialization of the Licensed Products.

         "Secret" shall mean that the Know-How as a body or in the precise
configuration and assembly of its components is not generally known or easily
accessible, so that part of its value consists in the lead-time CellPro gains
when it is communicated to it; Secret is not limited to the narrow sense that
each individual component of the Know-How should be totally unknown or
unobtainable outside the Corixa's business.

         "Substantial" shall mean that the Know-How includes information which
is of importance for the whole or a significant part of (i) a manufacturing
process or (ii) a product or service, or (iii) for the development thereof and
excludes information which is trivial. Such Know-How must thus be useful, i.e.,
can reasonably be expected at the date of conclusion of the Agreement to be
capable of improving the competitive position of CellPro, for example by helping
CellPro to enter a new market or giving CellPro an advantage in competition with
other manufacturers or providers of services who do not have access to the
licensed Secret Know-How or other comparable Secret Know-How.

         "Identified" shall mean that the Know-How is described or recorded in
such a manner as to make it possible to verify that it fulfills the criteria of
secrecy and substantiality and to ensure that CellPro is not unduly restricted
in its exploitation of its own technology.

7. CONFIDENTIALITY; PUBLICITY; PUBLICATIONS

         7.1 CONFIDENTIALITY.

         In fulfilling their obligations under this Agreement, it may be
desirable or necessary for the parties to disclose to one another certain of
their Confidential Information. In the event of receipt of such Confidential
Information, the receiving party agrees to preserve such information as
confidential and not to disclose it to third parties or to use it except in
connection with this Agreement for a period of five (5) years after receipt.
Except as provided in Sections 7.2 and 7.3, CellPro shall keep confidential and
not disclose to third 

                                      -16-


<PAGE>   17

parties or use except as allowed by this Agreement all information related to
Joint Know-How Rights in the Corixa Field and Joint Patent Rights in the Corixa
Field. Similarly, except as provided in Sections 7.2 and 7.3, Corixa shall keep
confidential and not disclosure to third parties or use except as allowed by
this Agreement all information related to Joint Know-How Rights in the CellPro
Field and Joint Patent Rights in the CellPro Field. The foregoing obligations
shall not apply to any information that:

                  (a) is now in the public domain or becomes generally available
to the public through no fault of the receiving party;

                  (b) is already known to, or in the possession of, the
receiving party as can be demonstrated by documentary evidence;

                  (c) is disclosed to the receiving party on a nonconfidential
basis by a third party having the right to make such disclosure; or

                  (d) is independently developed by the receiving party as can
be demonstrated by documentary evidence.

In addition, to the extent reasonably necessary to fulfill its obligations or
exercise its rights under this Agreement (a) a party may disclose Confidential
Information to its Affiliates, sublicensees, consultants, outside contractors
and clinical investigators, on a need-to-know basis on condition that such
persons or entities agree to be bound by the provisions of this Section 7.1, (b)
a party or its Affiliates or sublicensees may disclose Confidential Information
to governmental or other regulatory authorities to the extent that such
disclosure is reasonably necessary to obtain patents or regulatory
authorizations, provided that the disclosing party shall request confidential
treatment thereof, and (c) a party may disclose Confidential Information as
required by applicable law, regulation or judicial process, provided that such
party shall give the other party (i) prior written notice thereof; (ii) adequate
opportunity to object to any such disclosure or to request confidential
treatment thereof; and (iii) shall take all steps reasonably possible to
minimize the disclosure to that level mandated by law.

         7.2 PUBLICITY. The parties may make a joint announcement of the
existence of this Agreement. Provided such disclosure involves no disclosure of
Corixa Confidential Information, CellPro may announce clinical, regulatory and
commercial developments related to Licensed Products. All announcements made by
either party pursuant to this Section will give appropriate credit to the
scientific contributions of other party. Other than as described above, neither
party shall publish any news release or other public announcement, written or
oral, announcing this Agreement or any performance hereunder, except to the
extent required by law in the reasonable opinion of legal counsel for the
originating party (written notice of such opinion being given to the other party
prior to publication and such publication delayed for a reasonable time to allow
the nonpublishing party to respond) or to the extent mutually agreed by the
parties. Corixa acknowledges and agrees that CellPro may file this Agreement
with the Securities and Exchange Commission pursuant to applicable regulations
(with 

                                      -17-


<PAGE>   18

appropriate requests for confidential treatment of certain matters after
consultation with Corixa).

         7.3 PUBLICATION. Each party shall have the right to publish or present
the results of the Research Program and announce scientific progress or results
of the Research Program provided such publication, presentation or announcement
does not otherwise disclose Confidential Information of the other party and such
publication or announcement (and any revisions) is submitted to the
nonpublishing party at least sixty (60) days prior to submitting it to a
journal, editor, news wire or other third party. The nonpublishing party shall
have sixty (60) days after receipt to review the proposed publication or
presentation. Upon notice within such sixty (60) day period by the nonpublishing
party that such party reasonably believes a patent application relating to the
results of the Research Program should be filed prior to the publication or
presentation, submission of the publication or presentation shall be delayed but
in no case for more than ninety (90) days from the date of such notice.

8. PATENT OWNERSHIP; PATENT PROSECUTION

         8.1 SOLE PATENT RIGHTS. Patentable Technology made, conceived or
reduced to practice solely by one or more employees or agents of only one party
in the course of performing the Research Program shall be owned by such party,
subject to the licenses granted herein. A party's rights in such Technology are
part of that party's Sole Patent Rights. Each party shall, at its own cost,
diligently and in good faith file, prosecute, and maintain patents on its Sole
Patent Rights according to its own internal standards using patent counsel and
other professional advisors of its own choosing. Each party shall promptly
disclose to the other party and the Joint Research Committee the conception or
reduction to practice under the Research Program of any inventions for which
Sole Patent Rights may be sought.

         8.2 JOINT PATENT RIGHTS. Technology made, conceived or reduced to
practice by one or more employees or agents from each party in the course of
performing the Research Program shall be owned by each party with the other
party as equal, undivided property, subject to the licenses granted under this
Agreement. Rights in such Technology as is patentable and nonpatentable are part
of the Joint Patent Rights and Joint Know-How Rights, respectively. Each party
shall promptly disclose to the other party and the Joint Research Committee the
conception or reduction to practice of inventions for which Joint Patent Rights
may be sought. Corixa shall control the filing, prosecution and maintenance of
Joint Patent Rights; provided that CellPro shall, subject to the rights of third
party licensors of Corixa Technology, control the filing, prosecution and
maintenance of Joint Patent Rights in the CellPro Technical Field. The party
controlling the filing, prosecution and maintenance of Joint Patent Rights (the
"Filing Party") shall retain patent counsel reasonably acceptable to the other
party to assist in the filing, prosecution and maintenance of Joint Patent
Rights. The Filing Party shall cause to be provided to the other party the text
of any patent applications before filing and consider in good faith and
incorporate the other party's reasonable requests related thereto. In all other
matters related to the filing, prosecution, issuance and maintenance of Joint
Patent Rights, the Filing Party shall provide to the other party copies of 

                                      -18-


<PAGE>   19

any official action or submission and shall confer with the other party giving
due consideration to the other party's reasonable requests. The reasonable costs
of filing, prosecuting and maintaining the Joint Patent Rights shall be shared
equally by Corixa and CellPro or the party assuming responsibility under Section
8.4. CellPro will have the exclusive right in the CellPro Field and the CellPro
Technical Field to make, have made, use, sell, have sold or license any right
under the Joint Patent Rights and Joint Know-How Rights, with no obligation to
account to Corixa. Corixa will have the exclusive right outside the CellPro
Field and the CellPro Technical Field to make, have made, use, sell, have sold
or license any right under the Joint Patent Rights and Joint Know-How Rights,
with no obligation to account to CellPro.

         8.3 COOPERATION. Each party shall cooperate and assist the other party
in connection with its filing, prosecution and maintenance of Sole Patent Rights
and Joint Patent Rights. Each party shall keep the other party informed at
regular intervals, or upon request, of the status of all patent applications and
patents with respect to its Sole Patent Rights licensed hereunder and with
respect to Joint Patent Rights for which it has responsibility. Where
appropriate, each party shall sign or cause to have signed all documents
relating to the patent applications or patents for the Joint Patent Rights and
shall cause such patent applications and patents to be assigned to CellPro and
Corixa jointly.

         8.4 ABANDONMENT. In the event that CellPro or Corixa elect not to file,
prosecute, maintain or pay their proportionate share of the reasonable costs for
a Sole Patent Right licensed hereunder or a Joint Patent Right, it shall
promptly provide adequate notice to the other party and allow the other party,
at its expense, the opportunity to proceed with such Sole Patent Right or Joint
Patent Right and the party electing not to file, prosecute or maintain a Sole
Patent Right or a Joint Patent Right shall promptly assign all of its right,
title and interest in and to such patent right to the other party, if such other
party elects to proceed.

         8.5 PATENT TERM RESTORATION. The party that has responsibility under
this Section 8 for prosecuting a patent that is licensed under this Agreement
for making, having made, using, selling or having sold a Licensed Product shall
promptly notify the other party of (a) the issuance of a patent in the United
States or foreign country, including its issue date and patent number, where
extension of the term of the patent is possible under the Drug Price Competition
and Patent Term Restoration Act of 1984 or any similar foreign law, or successor
United States or foreign law (the "Patent Term Restoration Act") and (b) any
notice it receives under the Patent Term Restoration Act, including notices from
persons who have filed in the United States an abbreviated new drug application.
The notice to be provided to the other party shall be given within ten (10) days
after issuance of the patent or receipt of the notice pursuant to the Patent
Term Restoration Act, as the case may be. After such notice, the parties shall
discuss relevant issues, possible courses of action, any third-party allegations
of failure to show due diligence and any extensions of the patent term under the
Patent Term Restoration Act.

                                      -19-


<PAGE>   20

9. PATENT ENFORCEMENT

         9.1 NOTICE AND PRIMARY RESPONSIBILITY. Upon learning of the
infringement in the CellPro Field of Corixa's Sole Patent Rights or the Joint
Patent Rights by a third party, a party shall promptly provide notice to the
other party in writing of the fact and shall supply the other party with all
evidence possessed by it pertaining to and establishing such infringement.
Corixa or its licensors shall have three (3) months from the date of learning of
the infringement or receipt of notice of infringement (or, in the case of Corixa
Technology licensed to Corixa from third parties, such other time period as is
specified in the applicable third party license agreement), or such lesser
period of time if a further delay could result in material harm to, or loss of a
material right of, CellPro to abate the infringement or to file suit against at
least one of the infringers, at its sole expense and benefit, following
consultation with CellPro. Notwithstanding the above, in the case of
infringement of Corixa Technology licensed from third parties where the
applicable third party license agreement specifies that Corixa has the first
right to act and the licensor may act if Corixa fails to do so, Corixa shall,
upon becoming aware of such an infringement, take action or immediately tender
to CellPro its right to act. Corixa shall not be obligated to bring or maintain
more than one such suit at any time with respect to claims directed to any one
method of manufacture, use or composition of matter.

         9.2 FAILURE TO ENFORCE. If Corixa does not bring the suit within the
time set forth in Section 9.1 (or, in the case of Corixa Technology licensed to
Corixa from third parties, within the time period permitted in the applicable
third party license agreement), CellPro shall have the right to take whatever
action it deems appropriate in its own name or, if required by law, in the name
of Corixa to enforce such Sole Patent Rights or Joint Patent Rights. Prior to
commencement of such infringement suit, Corixa may, at its option, elect to pay
[***]% of the costs and expenses of any such infringement suit. If Corixa elects
to pay such amounts, then all monies recovered upon the final judgment or
settlement of any such infringement suit shall, be [***]. If Corixa does not
elect to pay such amounts, then CellPro will retain any and all monies recovered
upon the first judgment or settlement of any such infringement suit. The parties
shall fully cooperate with each other in the planning and execution of any suit
to enforce their Sole Patent Rights in the CellPro Field or Joint Patent Rights.
CellPro will not have any obligation to take any specific enforcement action or
share any proceeds from such an action with respect to CellPro's Sole Patent
Rights.

         9.3 JOINT PATENT RIGHTS. The parties shall confer with respect to
enforcement of the Joint Patent Rights. In the absence of any other agreement as
to the enforcement of the Joint Patent Rights, Corixa shall have the right to
enforce the Joint Patent Rights during the Research Term. After the Research
Term and in the absence of any agreement between the parties, each party shall
have the right to enforce the Joint Patent Rights at its expense and retain any
award of damages or expenses, except that the party whose exclusive license
rights in the Joint Patent Rights are being infringed shall have three (3)
months from the date of learning of the infringement or receipt of notice of
infringement (or such lesser period of time if a further delay could result in
material harm to, or loss of a material right of, the other 

                                      -20-


<PAGE>   21

party) to abate the infringement or to file suit against at least one of the
infringers, at its sole expense following consultation with the other party and
the provisions of Section 9.2 shall apply (i.e., right of the other party to
subsequently bring an infringement suit, sharing of any final judgment or
settlement and cooperation).

         9.4 PARTICIPATION. The party bringing the infringement suit shall not
settle the suit or otherwise consent to an adverse judgment in such suit in a
manner that diminishes the rights or interests of the other party without the
other party's consent.

10. PATENT INFRINGEMENT

         If a party, or to its knowledge any of its Affiliates, sublicensees or
customers, shall be sued by a third party for infringement of a patent because
of the performance of the Research Program or the development, manufacture, use
or sale of Product Candidates or Licensed Products, such party shall promptly
notify the other party in writing of the institution of such suit. Subject to
the rights of third party licensors of Corixa Technology, the party sued shall
have the right, in its sole discretion, to control the defense of such suit at
its own expense, in which event the other party shall cooperate fully in the
defense of such suit and furnish to the party sued all evidence and assistance
in its control. The party sued shall not settle the suit or otherwise consent to
an adverse judgment in such suit in a manner that diminishes the rights or
interests of the other party without the other party's consent. Any judgments,
settlements or damages payable with respect to the suit shall be paid by the
party that controls the defense of the suit, subject to any claims against the
other party for breach of or for indemnification under this Agreement or that
are otherwise available at law or in equity. Any third-party royalty payments
required to be paid as a result of a judgment or settlement under this Section
10 shall be paid by CellPro. [***].

11. REPRESENTATION AND WARRANTIES

         11.1 BOTH PARTIES. Each party hereby represents and warrants to the
other party that as of the date hereof:

                  (a) All necessary consents, approvals and authorizations of
all governmental authorities and other persons required to be obtained in
connection with execution, delivery and performance of this Agreement have been
obtained.

                                      -21-


<PAGE>   22

                  (b) Notwithstanding anything to the contrary in this
Agreement, its execution, delivery and performance of this Agreement (i) shall
not conflict with or violate any requirement of applicable laws or regulations
and (ii) shall not conflict with, violate or breach or constitute a default or
require any consent under any of its contractual obligations.

                  (c) Such party has all rights necessary to grant the licenses
being granted by it under this Agreement, without conflict with the rights of
any third party, and has taken all steps required under any third party
agreements to grant such licenses.

         11.2 CELLPRO.

         CellPro hereby represents and warrants to Corixa that:

                  (a) CellPro has not granted commercialization rights which
would conflict with its performance of this Agreement. CellPro does not have any
agreements with any third party, including the U.S. government, that give the
third party, including the U.S. government, any right to acquire, own or possess
in the CellPro Field any commercial right or interest in any patents or other
proprietary rights arising or resulting from its work in the Research Program.

                  (b) Except as disclosed to Corixa, CellPro is not aware, after
reasonable diligence, of any patents or other proprietary rights of any third
party that would materially affect the performance of the Research Program by
CellPro or the exercise of the license rights granted hereunder to Corixa.

         11.3 CORIXA.

         Corixa hereby represents and warrants to CellPro that:

                  (a) Corixa has not granted commercialization rights under the
Corixa Technology in the CellPro Field to any third party. Corixa does not have
any agreements with any third party, including the U.S. government, that give
the third party, including the U.S. government, any right to acquire, own or
possess in the CellPro Field any commercial right or interest in any patents or
other proprietary rights arising or resulting from its work in the Research
Program.

                  (b) Schedule 1.10, as amended from time to time, contains a
list of all patent applications filed on or before the Effective Date that are
included in the Corixa Technology. All the inventors named in the applications
have assigned, or are under an obligation to assign, to Corixa or its licensor
all of their right, title and interest in the inventions claimed in the
applications.

                  (c) Corixa has not received any notice of a claim of
infringement or misappropriation of any alleged rights asserted by any third
party in relation to any Corixa Technology.

                                      -22-


<PAGE>   23

                  (d) Except as disclosed to CellPro, Corixa is not aware, after
reasonable diligence; of any patents or other proprietary rights of any third
party which would materially affect the performance of the Research Program by
Corixa or the exercise of the license rights granted hereunder to CellPro.

                  (e) Corixa owns or is the licensee in good standing of all
Corixa Technology

         11.4 COVENANTS.

                  (a) Both parties covenant and agree that they shall at all
times during the term of this Agreement and thereafter so long as the Licensed
Products are being commercialized, keep current all such party's obligations to
its licensors with respect to any technology which is the subject matter of this
Agreement.

                  (b) Each of Corixa and CellPro covenants and agrees that it
shall diligently and in good faith file, prosecute and maintain all patents
owned or controlled by such party and licensed or sublicensed hereunder.
   

                  (c) Corixa covenants that it will use commercially reasonable
efforts to obtain a license to the Microsphere Technology (which will include a
worldwide license, with rights to sublicense, to make, have made, use, sell and
have sold Licensed Products using the Microsphere Technology) and will amend
Schedule 1.10 to include the Microsphere Technology by January 1, 1997.  If
Corixa fails to obtain such license on or before January 1, 1997 (or any
applicable extension date) then CellPro may, at its option, elect to terminate
this Agreement by delivering written notice of termination to Corixa on or
before January 31, 1997. If CellPro does not deliver such notice on or before
January 31, 1997, this Agreement will continue in full force and effect, and
Corixa will furnish, without charge to CellPro, services scheduled to be
performed under the Research Plan with a value of $200,000, and accordingly the
amount of funding for the next quarterly payment under Section 2.2 will be
reduced by $200,000.  If CellPro delivers such notice on or before January 31,
1997, then this Agreement will terminate and (i) each party will return
Confidential Information of the other in accordance with Section 14.5; (ii) the
licenses set forth in Section 3 will terminate; (iii) the parties' rights to
the results of the Research Program through the date of termination will be
determined under Section 8; (iv) neither party will have any further obligation
under the Research Program or any obligation to make or refund any payment
under this Agreement; and (v) such termination shall not relieve either party
of any obligation accruing prior to such termination.

                  (d) Corixa covenants that it will use commercially reasonable
efforts to ensure that the license to the Microsphere Technology permits
CellPro to use the Microsphere Technology in Liquid Tumor Therapy (in addition
to Solid Tumor Therapy) in the CellPro Field. If Corixa obtains the license
described in Section 11.4(c), but such license does not permit CellPro to use
the Microsphere Technology in Liquid Tumor Applications on the
    







                                      -23-


<PAGE>   24
   
CellPro Field, and Corixa will furnish, without charge to CellPro, services
scheduled to be performed under the Research Program with a value of $200,000,
and accordingly the amount of funding for the next quarterly payment under
Section 2.2 will be reduced by $200,000.
    

   
                  (e) Corixa covenants that it will obtain prior to July 1,
1996 amendments, modifications or waivers as reasonably required to ensure that
this Agreement does not conflict with or cause a breach of any of the license
agreements listed on Schedule 6.2(a) under which Corixa has obtained licenses to
Corixa Technology from Dana Farber, University of Pittsburgh, University of
Washington/Washington Research Foundation and Roswell Park.
    

                  (f) Corixa will defend, and indemnify CellPro from any third
party claims arising out of Corixa's financial obligations to existing third
party licensors of Corixa Technology under the license agreements listed on
Schedule 6.2(a) (e.g., royalty calculations and payment, net sales calculation,
license or sublicense fees, indemnification obligations, etc.). Corixa will have
no obligation to reimburse or indemnify CellPro for any claim arising out of a
failure of a third party licensor to obtain any specific patent or other
intellectual property protection.

         11.5 DISCLAIMER. EXCEPT AS SET FORTH IN THIS AGREEMENT, CORIXA MAKES NO
OTHER REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE CORIXA TECHNOLOGY OR ANY
PRODUCTS RELATED THERETO, AND CELLPRO MAKES NO OTHER REPRESENTATIONS OR
WARRANTIES WITH RESPECT TO THE CELLPRO TECHNOLOGY OR ANY PRODUCTS RELATED
THERETO, EXPRESS OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE, PATENTABILITY AND NONINFRINGEMENT. NOTHING IN THIS
AGREEMENT SHALL BE CONSTRUED AS A WARRANTY THAT ANY APPLIED-FOR PATENT SHALL
ISSUE OR OTHERWISE BECOME VALID OR ENFORCEABLE.

         11.6 LIMITATION OF LIABILITY. NEITHER PARTY HEREUNDER SHALL BE LIABLE
IN ANY EVENT FOR ANY INDIRECT, CONSEQUENTIAL OR PUNITIVE DAMAGES OR FOR LOST
PROFITS.

12. INDEMNIFICATION; INSURANCE

         12.1 DIRECT INDEMNITY. Each party shall indemnify and hold the other
party, its Affiliates and sublicensees harmless, and hereby forever releases and
discharges the other party, its Affiliates and sublicensees, from and against
all claims, demands, liabilities, damages and expenses, including attorneys'
fees and costs (collectively, "Liabilities"), related to any claim of a third
party (not an Affiliate or sublicensee) arising out of the negligence,
recklessness or intentional misconduct of the indemnifying party, its Affiliates
or sublicensees in connection with the work performed by such party in the
Research Program, development or the marketing or sale of Product Candidates or
Licensed Products hereunder; or the breach 

                                      -24-


<PAGE>   25

of any warranty hereunder except in each case to the extent such Liabilities
resulted from the negligence, recklessness or intentional misconduct of the
other party.

         12.2 OTHER INDEMNITY. Each party shall indemnify and hold the other
party, its Affiliates and sublicensees harmless from and against all Liabilities
suffered or incurred in connection with third-party claims for personal injuries
or any product recall to the extent caused by (a) any failure to test for or
provide adequate warnings of adverse side effects to the extent such failure
arises out of the negligence, recklessness or intentional misconduct in
connection with the indemnifying party's preclinical or clinical testing
obligations hereunder, (b) any manufacturing defect in any Product or any other
material manufactured by the indemnifying party, its Affiliates or its
sublicensees or (c) any other act or omission (without regard to culpable
conduct) of the indemnifying party, its Affiliates or its sublicensees in
connection with the activities contemplated under this Agreement; except in each
case to the extent such Liabilities resulted from the negligence, recklessness
or intentional misconduct of the other party.

         12.3 PROCEDURE. A party that intends to claim indemnification under
this Section 12 or paragraph 11.4(f) (the "Indemnitee") shall promptly notify
the other party (the "Indemnitor") of any Liability or action in respect of
which the Indemnitee or any of its Affiliates or sublicensees intend to claim
such indemnification, and the Indemnitor shall have the right to participate in,
and, to the extent the Indemnitor so desires, jointly with any other Indemnitor
similarly noticed, to assume the defense hereof with counsel selected by the
Indemnitor; provided, however, that an Indemnitee shall have the right to retain
its own counsel, with the fees and expenses of such counsel to be paid by the
Indemnitee, if representation of such Indemnitee by the counsel retained by the
Indemnitor would be inappropriate due to actual or potential differing interests
between such Indemnitee and any other party represented by such counsel in such
proceedings. The indemnity agreement in this Section 12 shall not apply to
amounts paid in settlement of any loss, claim, damage, liability or action if
such settlement is effected without the consent of the Indemnitor, which consent
shall not be withheld unreasonably. The failure to deliver notice to the
Indemnitor within a reasonable time after the commencement of any such action,
if prejudicial to its ability to defend such action, shall relieve such
Indemnitor of any liability to the Indemnitee under this Section 12, but the
omission so to deliver notice to the Indemnitor shall not relieve it of any
liability that it may have to any Indemnitee otherwise than under this Section
12. The Indemnitee under this Section 12, its employees and agents shall
cooperate fully with the Indemnitor and its legal representatives in the
investigation of any action, claim or Liabilities covered by this
indemnification.

         12.4 INSURANCE. Commencing at the time of CellPro's initial clinical
testing of a Licensed Product, CellPro shall maintain for each Licensed Product,
through self-insurance or otherwise, liability insurance with respect to its
development, manufacture and sale of Licensed Products as follows:

                                      -25-


<PAGE>   26

<TABLE>
<CAPTION>
                  COVERAGE                                 LIMITS
        -----------------------------          ---------------------------------
<S>     <C>                                    <C>  
(a)     Workers' Compensation                  Statutory

(b)     Employer's Liability                   $[***]

(c)     Commercial General Liability;          $[***]
        including without limitation,           
        Products, Contractual, Fire,           
        Legal and Personal Injury

(d)     Umbrella Liability                     $[***]
                                               ---------------------------------
</TABLE>

CellPro shall maintain such insurance for so long as it continues to develop,
manufacture or sell any Licensed Products, and thereafter for so long as CellPro
maintains insurance for itself covering such manufacture or sales.

         12.5 INDEMNITY EXCLUSION. A party that relinquishes rights to a Product
Candidate or Licensed Product to the other party shall not be obligated to
indemnify the other party, its Affiliates or sublicensees under Sections 12.1
and 12.2 with respect to their use of information obtained from the
relinquishing party as a result of the relinquishing of rights to the Product
Candidate or Licensed Product.

13. DISPUTE RESOLUTION

         13.1 GOOD FAITH DISCUSSIONS. The parties shall attempt to resolve
through good faith discussions any dispute which arises under this Agreement.
Any dispute may, at the election of either party, be referred to the chief
executive officers of each party. If they are unable to resolve the dispute,
except one having to do with the scope, enforceability, infringement or validity
of a patent or trade secret, within thirty (30) days after delivery of written
notice of the dispute from one party to the other, either party may seek to
resolve it by initiating an Alternative Dispute Resolution ("ADR") in which the
Judicial Arbitration and Mediation Services ("JAMS"), Seattle, Washington shall
select the arbitrator ("Arbitrator") as provided herein. If JAMS is not in
existence at the time of such dispute the American Arbitration Association,
Seattle, Washington shall be substituted.

         13.2 SELECTION OF ARBITRATOR. An ADR shall be initiated by a party by
sending written notice thereof to the other party and JAMS, which notice shall
state the issues to be resolved. Within ten (10) business days after receipt of
such notice, the other party may, by sending written notice to the initiating
party and JAMS, add issues to be resolved. Within twenty (20) business days
after the date of the original ADR notice, JAMS shall nominate to the parties at
least five (5) qualified nominees from JAMS's panel. The parties shall have five
(5) business days after the receipt of such nominations to agree on a Arbitrator
or, failing to agree, to rank-order their preferences with the most preferred
being given the lowest number, 

                                      -26-


<PAGE>   27

and mail the rank-order to JAMS. JAMS shall notify the parties of their
selection. If all nominees are unacceptable to a party, the procedure shall be
repeated and, if the parties cannot select a Arbitrator the second time, JAMS
shall select the Arbitrator.

         13.3 ARBITRATOR WITH SPECIAL EXPERTISE. In the event of a dispute
between the parties relating to the calculation of any royalties or the amount
of other consideration payable under this Agreement (including, without
limitation, the results of any audit conducted on behalf of a party pursuant to
Section 6.4), then, in addition to the procedure set forth in Section 13.2, the
Arbitrator shall be a partner or full member of an internationally recognized
certified public accounting firm which is not an auditing firm for either party
and has not provided material services to either party during the last two (2)
year period prior to the date of ADR initiation.

         13.4 ADR HEARING. The Arbitrator shall hold a hearing to resolve the
issues within one hundred twenty (120) business days after selection. The
location of the hearing shall be Seattle, Washington. Each party may be
represented by counsel. Prior to the hearing, the parties shall be entitled to
engage in discovery under procedures of the Federal Rules of Civil Procedure;
provided, however, that a party may not submit more than fifty (50) written
interrogatories or take more than six (6) depositions. There shall not be, and
the Arbitrator shall not permit, any discovery within thirty (30) days of the
hearing. The Arbitrator shall have sole discretion regarding the admissibility
of evidence and conduct of the hearing. At least five (5) business days prior to
the hearing, each party shall submit to the other party and the Arbitrator a
copy of all exhibits on which such party intends to rely at the hearing, a
pre-hearing brief (up to 30 pages) and a proposed disposition of the dispute (up
to 5 pages). The proposed disposition shall be limited to proposed rulings and
remedies on each issue, and shall contain no argument on or analysis of the
facts or issues; provided, however, that the parties will not present proposed
monetary remedies. Within five (5) business days after close of the hearing,
each party may submit a post-hearing brief (up to 5 pages) to the Arbitrator.

         13.5 ADR RULING; FEES AND EXPENSES. The Arbitrator shall render a
disposition on the proposed rulings as expeditiously as possible after the
hearing, but not later than fifteen (15) business days after the conclusion of
the hearing. The Arbitrator shall rule on each issue and shall adopt in its
entirety the proposed ruling of one of the parties on each issue. In the
circumstances where the Arbitrator rules for a party on a claim in the form of a
claim for monetary damages, the parties will then submit a proposed remedy
within ten (10) days of notice of the ruling. The proposed remedy may be
accompanied by a brief in support of the remedy not to exceed five (5) pages.
The Arbitrator will rule on and adopt one of the proposed remedies within ten
(10) days of their submission. The Arbitrator's disposition shall be final and
not appealable, except that either party shall have the right to appeal such
disposition on the basis it was affected by fraud or bad faith in connection
with the ADR proceedings. A judgment on the Arbitrator's disposition may be
entered in any court having jurisdiction over the parties. The reasonable fees
and expenses of the Arbitrator, as well as the standard charges of JAMS for its
assistance, shall be borne equally by the parties or as they may otherwise
agree.

                                      -27-


<PAGE>   28

         13.6 JAMS RULES. Except as otherwise provided in this Section 13, JAMS
Rules shall be used in connection with the ADR.

         13.7 WAIVER. A party shall not be prohibited from bringing a claim for
resolution under this Section 13 on the ground that the claim could have been
brought during an earlier proceeding under this Section 13.

14. TERM; TERMINATION

         14.1 EXPIRATION. Unless terminated earlier by agreement of the parties
or pursuant to Section 14.4, this Agreement shall expire on the last to expire
of any Royalty Periods (i.e., when CellPro no longer has an obligation to pay
royalties under this Agreement).

         14.2 EARLIER TERMINATION. If CellPro has failed to provide the funding
set forth in Section 2.2 within ten (10) days after notice of such failure,
Corixa shall have the right to terminate this Agreement. If Corixa fails to
perform its obligations under the Research Program within thirty (30) days after
notice of such failure (or, if such failure cannot reasonably be remedied within
thirty (30) days, then such longer period as is reasonable, not to exceed ninety
(90) days), CellPro shall have the right to terminate funding for the Research
Program. In such event, the provisions of Section 2 of this Agreement will be
terminated, but the license set forth in Section 3.1 will continue in full force
and effect solely with respect to the Corixa Technology as it exists on the date
of such termination, subject to payment of royalties and the other provisions of
this Agreement. Except as provided in this Section 14.2, a party shall not have
the right to terminate this Agreement or the license rights hereunder for breach
by the other party, but shall have the right to seek remedies, both equitable
and legal, for breach using the procedures of Section 13. If as a result:

                  (a) the Arbitrator, in accordance with the procedures set
forth in Section 13 renders a ruling (an "Adverse Ruling") that CellPro has
breached this Agreement by (i) failing to make a milestone payment with respect
to a Product as and when due or (ii) failing to make a royalty payment with
respect to a Product as and when due;

                  (b) CellPro has failed to comply with the terms of the Adverse
Ruling within the time period specified therein for compliance or, if no time
period is stated, within ten (10) days after the Adverse Ruling; and

                  (c) Corixa has served notice upon CellPro to undertake the
actions required by the Adverse Ruling and CellPro has failed, within ten (10)
days of such notice, to undertake such action;

then Corixa shall have the right to terminate any or all of CellPro's license
rights under this Agreement.

                                      -28-


<PAGE>   29

         14.3 EFFECT OF EXPIRATION OR TERMINATION.

                  (a) Expiration or termination of this Agreement shall not
relieve the parties of any obligation accruing prior to such expiration or
termination. Any accrued obligation and the provisions of Sections 1, 6.7, 7,
11, 12, 13, 14.5 and 16.4 shall survive the expiration or termination of this
Agreement. In the event of termination of this Agreement or termination of a
license right granted to CellPro under Section 3.1(b), CellPro, its Affiliates
and its sublicensees shall have the right over the next six (6) months to sell
any inventory of the Licensed Products affected by such termination, provided
royalties are paid to the other party which would otherwise be payable during
the term of this Agreement.

                  (b) Unless subject to termination pursuant to Section 14.2,
nonrenewal of the Research Term pursuant to Section 2.3 shall not result in
termination of rights accruing to the parties during the Research Term. In the
event CellPro later elects to fund further research at Corixa, the parties shall
negotiate in good faith the terms of such funding, including applicable royalty
rates, on terms at least as favorable to Corixa as the terms hereof.

                  (c) Upon expiration of the Royalty Period for any Licensed
Product, CellPro shall have a fully paid-up, sublicensable worldwide, perpetual
license to make, have made, use, sell and have sold such Licensed Product.

         14.4 BANKRUPTCY. Either party shall have the right to terminate this
Agreement by delivering sixty (60) days' prior written notice to the other party
in the event of the other party's bankruptcy or insolvency, provided that
applicable federal bankruptcy laws shall apply.

         14.5 RETURN OF MATERIALS. Upon termination of this Agreement (or
termination of a license as provided in Section 14.2), each party shall promptly
return all forms of the Confidential Information received from the other party
(or the Confidential Information pertaining to the terminated license),
retaining only one copy of written or electronic Confidential Information for
archival purposes. Upon expiration or termination of this Agreement, each party
shall promptly return all forms of the Confidential Information pertaining to
the licenses in Sections 3.1(a) and 3.2(b), retaining only one copy of written
or electronic Confidential Information for archival purposes.
   

15.     RIGHT TO PARTICIPATE IN NON-CELLPRO VENTURE

        In the event CellPro sublicenses any of its rights in Corixa Technology
to any special purpose entity (e.g., a SWORD, SPARC, RDLP or similar research
and development funding arrangement) in order to pursue funding for the
development or commercialization of such technology, then CellPro shall offer
to Corixa the right to participate in the ownership of such entity, at Corixa's
option, (i) on a basis consistent with CellPro's participation or (ii) on a
basis consistent with a third party equity investor. Upon Corixa's exercise of
its rights under this Section 15, CellPro, Corixa and any third parties
involved in financing the entity shall negotiate in good faith terms that are
fair and mutually beneficial, including the form of Corixa's consideration for
its ownership interest.
    



                                      -29-


<PAGE>   30

16. MISCELLANEOUS

         16.1 FORCE MAJEURE. Neither party shall be held liable or responsible
to the other party, nor be deemed to have breached this Agreement, for failure
or delay in fulfilling or performing any term of this Agreement when such
failure or delay is caused by or results from causes beyond the reasonable
control of the affected party, including, without limitation, fire, floods,
embargoes, war, acts of war (whether war be declared or not), insurrections,
riots, civil commotions, strikes, lockouts or other labor disturbances, acts of
God or acts, omissions or delays in acting by any governmental authority;
provided that the affected party uses diligent and reasonable efforts to end the
adverse effect of such force majeure. No payments for the Research Program will
be due for the duration any period of force majeure that prevents Corixa from
performing its obligations under the Research Program.

         16.2 ASSIGNMENT. Neither this Agreement nor any rights or obligations
hereunder may be assigned or otherwise transferred by either party without the
consent of the other party; provided, however, that either Corixa or CellPro may
assign this Agreement and its rights and obligations hereunder in connection
with the transfer or sale of all or substantially all of its assets concerning
the technology licensed hereunder, its merger or consolidation or any similar
transaction. Any permitted assignee shall assume all obligations of its assignor
under this Agreement.

         16.3 SEVERABILITY. If any term or provision of this Agreement is held
invalid, illegal or unenforceable by a court or other governmental authority of
competent jurisdiction, such invalidity, illegality or unenforceability shall
not affect any other term or provision of this Agreement, which shall remain in
full force and effect. The holding of a term or provision invalid, illegal or
unenforceable in a jurisdiction shall not have any effect on the application of
the term or provision in any other jurisdiction.

         16.4 INTEREST. Any past due payments under this Agreement shall accrue
interest at [***] ([***]%) per annum until paid or the maximum rate
permitted by applicable law, whichever is less.

         16.5 NOTICES. Any notice required to be given under this Agreement
shall be in writing, delivered personally, by facsimile (promptly confirmed by
personal delivery, first-class mail U.S. or courier), first-class mail U.S. or
courier, postage prepaid, at the addresses indicated below, or to such other
address as the addressee shall have last furnished in writing to the addresser
and (except as otherwise provided in this Agreement) shall be effective upon
receipt by the addressee if delivered personally or by facsimile or two (2) days
after being sent by first class mail carrier or courier.

                                      -30-


<PAGE>   31

        If to Corixa:               Corixa Corporation
                                    1124 Columbia Street, Suite 464
                                    Seattle, WA 98104
                                    Attention:  Chief Operating Officer
                                    Fax: 206/667-5715

        with a copy to:             Legal Dept.

        If to CellPro:              CellPro, Incorporated
                                    22215 26th Avenue S.E.
                                    Bothell, WA 98021
                                    Attention:  President and CEO
                                    Fax: 206/485-4787

         16.6 APPLICABLE LAW. This Agreement shall be governed by and construed
in accordance with the laws of the state of Washington regardless of its or any
other jurisdiction's choice-of-law provisions, and shall not be governed by the
United Nations Convention on Contracts for the International Sale of Goods.

         16.7 ENTIRE AGREEMENT. This Agreement and all Schedules hereto, as the
same may be amended from time to time, contain the entire understanding of the
parties with respect to the subject matter hereof. All express or implied
agreements and understandings, either oral or written, heretofore made are
expressly merged in and made a part of this Agreement, including the Schedules
hereto. This Agreement, including the Schedules hereto, may be amended, or any
term hereof modified, only by a written instrument duly executed by each party
hereto.

         16.8 INDEPENDENT CONTRACTORS. Corixa and CellPro are and shall be
independent contractors and the relationship between the two parties shall not
constitute a partnership, joint venture or agency. Neither Corixa nor CellPro
shall have the authority to make any statements, representations or commitments
of any kind, or to take any action, which shall be binding on the other, without
the prior written consent of the party to do so.

         16.9 U.S. EXPORT LAWS AND REGULATIONS. Each party represents and
warrants to the other that it does not intend to, nor shall it, export from the
United States or reexport from any foreign country, or permit a third party to
export or reexport, technology or technical information of the other party to a
country where such export or reexport would be in violation of U.S. Export
Administration Regulations.

         16.10 WAIVER. The waiver by either party hereto of any right hereunder
or of a failure to perform or breach by the other party shall not be deemed a
waiver of any other right hereunder or of any other failure or breach whether of
a similar nature or otherwise.

                                      -31-


<PAGE>   32

         16.11 COUNTERPARTS. This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day and year first above written.

                                       CORIXA CORPORATION



                                       By: /s/ STEVEN GILLIS
                                          ------------------------------------
                                       Its: President, Chief Executive Officer


                                       CELLPRO, INCORPORATED



                                       By: /s/ RICHARD D. MURDOCH
                                          ------------------------------------
                                       Its: President and CEO

                                      -32-


<PAGE>   33
                                  Schedule 1.1O
                              CORIXA PATENT RIGHTS


<TABLE>
<CAPTION>
     Patent No./App. No.            Country            Filing/Issue Date
<S>                                 <C>                <C>
   [***]
Ser. No. [***]                        [***]              Filed [***]
Ser. No. [***]                        [***]              Filed [***]
Ser. No. [***]                        [***]              Filed [***]
Ser. No. [***]                        [***]              Filed [***]
Ser. No. [***]                        [***]              Filed [***]
Pat. No. [***]                        [***]              Issued [***]
Ser. No. [***]                        [***]              Filed [***]
Ser. No. [***]                        [***]              Filed [***]
Ser. No. [***]                        [***]              Filed [***]
Ser. No. [***]                        [***]              Filed [***]
Pat. No. [***]                        [***]              Issued [***]
Ser. No. [***]                        [***]              Filed [***]
Ser. No. [***]                        [***]              Filed [***]
Ser. No. [***]                        [***]              Filed [***]
Ser. No. [***]                        [***]              Filed [***]

       [***]
Ser, No. [***]                        [***]              Filed [***]
Ser. No. [***]                        [***]              Filed [***]
Ser. No. [***]                        [***]              Filed [***]
Ser. No. [***]                        [***]              Filed [***]

       [***]
Ser. No. [***]                        [***]              Filed [***]
Ser. No. [***]                        [***]              Filed [***]
PCT/US[***]                           [***]              Filed [***]

       [***]
Ser. No. [***]                        [***]              Filed [***]

       [***]
Ser. No. [***]                        [***]              Filed [***]
</TABLE>
<PAGE>   34
                                 Schedule 6.2(a)

                        EXISTING THIRD PARTY OBLIGATIONS

The obligations of Corixa under the following agreements:

   
1. License Agreement, dated as of November 11, 1994, between University of
Pittsburgh of the Commonwealth System of Higher Education and Corixa
Corporation.
    

   
2. Licensing Agreement, dated as of January 1, 1995, between Dana-Farber Cancer
Institute, Inc. and Corixa Corporation. Pursuant to the terms of this Agreement,
Corixa's exclusive rights, privileges and license terminate upon the expiration
of the last to expire of the patents licensed thereunder.
    

   
3. Exclusive License Agreement, dated as of June 12, 1995, between the
University of Washington and Corixa Corporation.
    

   
4. Exclusive License Agreement, dated as of June 12, 1995, between the
Washington Research Foundation and Corixa Corporation.
    

   
5. License Agreement, dated as of November 20, 1995, between Health Research,
Inc. and Corixa Corporation.
    

                             LICENSE FEE ALLOCATION

<TABLE>
<CAPTION>
                                     [***]
<S>                                          <C>      

                                                       --------

                 TOTAL                                  [***] 
</TABLE>



<PAGE>   35
                                  Schedule 2.1

                          1996 Budget and Research Plan

<TABLE>
<CAPTION>
First year research plan
Personnel and budget                                        #FTE
                                                            ----
<S>                                                         <C>
A.  Personnel

I.   T cell in propagation in vitro
       1. priming in vitro                                  1
       2. restimulation/expansion                           1
       3. CD4/8, Thl/2                                      0.5
II.  APC expansion                                          0.5
III. in vivo models                                         0.5
       1. VSV, 0VA                                          0
       2. rat neu, scid, transgenics                        0.5
IV.  Antigens
       1. Protein expression/purification                   1
       2. HLA expression purification/peptide binding       1
V.   Clinical
       1. Antigen manufacture/control                       0
                                                            ---
Total FTE's                                                 5.5

B.   Budget
5.5 FTE's at $210,000 per FTE                               $1,155,000
</TABLE>

C. Research Plan for 1996
[***]

        1. [***]

        2. [***]

        3. [***]

           [***]
<PAGE>   36
[***]
<PAGE>   37
                                 Schedule 6.2(b)
                        DESCRIPTION OF [***] TECHNOLOGY

[***] technology covered by the following patents and patent applications:


<TABLE>
<CAPTION>
   Patent No./App. No.                Country             Filing/Issue Date
 <S>                                  <C>                 <C>
 PAT. NO. [***]                        [***]                  ISSUED [***]
 Pat. No. [***]                        [***]                  Issued [***]
 Pat. No. [***]                        [***]                  Issued [***]
 Pat. No. [***]                        [***]                  Issued [***]
 Pat. No. [***]                        [***]                  Issued [***]
 Pat. No. [***]                        [***]                  Issued [***]
 Ser. No. [***]                        [***]                  Filed [***]
 Ser. No. [***]                        [***]                  Filed [***]
 Pat. No. [***]                        [***]                  Issued [***]
 Pat. No. [***]                        [***]                  Issued [***]
 Pat. No. [***]                        [***]                  Issued [***]

 Ser. No. [***]                        [***]                  Filed [***]
 Ser. No. [***]                        [***]                  FM [***]
 Pat. No. [***]                        [***]                  Issued [***]
 Ser. No. [***]                        [***]                  Filed [***]
 Pat. No. [***]                        [***]                  Issued [***]
 Pat. No. [***]                        [***]                  Issued [***]
 Pat. No. [***]                        [***]                  Issued [***]
 Ser. No. [***]                        [***]                  Filed [***]
 Pat. No. [***]                        [***]                  Issued [***]
 Pat. No. [***]                        [***]                  Issued [***]
 Ser. No. [***]                        [***]                  Filed [***]
 Ser. No. [***]                        [***]                  Filed [***]
 Pat. No. [***]                        [***]                  Issued [***]
 Ser. No. [***]                        [***]                  Filed [***]
 Ser. No. [***]                        [***]                  Filed [***]
 Ser. No. [***]                        [***]                  Filed [***]
 Ser. No. [***]                        [***]                  Filed [***]

 PAT. NO. [***]                        [***]                  Issued [***]
 Ser. No. [***]                        [***]                  Filed [***]
 Ser. No. [***]                        [***]                  Filed [***]
 Ser. No. [***]                        [***]                  Filed [***]
 Ser. No. [***]                        [***]                  Filed [***]
 Ser. No. [***]                        [***]                  Filed [***]
 Ser. No. [***]                        [***]                  Filed [***]
 Ser. No. [***]                        [***]                  Filed [***]
 Pat. No. [***]                        [***]                  Issued [***]
 Ser. No. [***]                        [***]                  Filed [***]
 Ser. No. [***]                        [***]                  Filed [***]
</TABLE>

<PAGE>   38
<TABLE>
 <S>                                 <C>                      <C>
 Ser. No. [***]                      [***]                    Filed [***]
 Pat. No. [***]                      [***]                    Issued [***]
 Ser. No. [***]                      [***]                    Filed [***]
 Pat. No. [***]                      [***]                    Issued [***]
 Ser. No. [***]                      [***]                    Filed [***]
 Pat. No. [***]                      [***]                    Issued [***]
 Pat. No. [***]                      [***]                    Issued [***]
 Pat. No. [***]                      [***]                    Issued [***]
 Pat. No. [***]                      [***]                    Issued [***]

 Pat. No. [***]                      [***]                    Issued [***]
 Ser. No. [***]                      [***]                    Filed [***]
 Ser. No. [***]                      [***]                    Filed [***]
 Ser. No. [***]                      [***]                    Filed [***]
 Ser. No. [***]                      [***]                    Filed [***]
 Ser. No. [***]                      [***]                    Filed [***]
 Ser. No. [***]                      [***]                    Filed [***]
 Ser. No. [***]                      [***]                    Filed [***]
 Pat  No. [***]                      [***]                    Issued [***]
 Ser. No. [***]                      [***]                    Filed [***]
 Ser. No. [***]                      [***]                    Filed [***]
 Ser. No. [***]                      [***]                    Filed [***]
 Pat  No. [***]                      [***]                    Issued [***]
 Pat. No. [***]                      [***]                    Issued [***]
 Ser. No. [***]                      [***]                    Filed [***]
 Pat. No. [***]                      [***]                    Issued [***]
</TABLE>

<PAGE>   1
                                                                 EXHIBIT 10.18



                              LICENSING AGREEMENT


         "Agreement", effective as of January 1, 1995 ("Effective Date") by and
between CORIXA CORPORATION, a Delaware corporation with its principal place of
business at 101 Stewart Street, Suite 700, Seattle, WA  98101-1048 (hereinafter
referred to as "Corixa"), and the DANA-FARBER CANCER INSTITUTE, INC.,  a
Massachusetts non-profit corporation, with its principal place of business at
44 Binney Street, Boston, Massachusetts, 02115 (hereinafter referred to as
"DFCI").


                                  WITNESSETH:

         WHEREAS, DFCI is the owner of certain rights in technology as later
defined herein, subject only to a royalty-free, nonexclusive license heretofore
granted to the United States Government; and


         WHEREAS, DFCI desires to have such rights utilized to promote the
public interest by granting a license hereunder;


         WHEREAS, Corixa has represented to DFCI that Corixa and/or its
officers and employees are experienced in the development, production,
marketing and sale of products similar to the technology which is the subject
of this Agreement and has the financial capacity and the strategic commitment
to facilitate the transfer of such technology for the public interest; and


         WHEREAS, Corixa desires to obtain a license to said rights upon the
terms and conditions hereinafter set forth;


         NOW THEREFORE, in consideration of the mutual covenants herein
contained and intending to be legally bound hereby, the parties hereto agree as
follows:

<PAGE>   2
                            ARTICLE I - Definitions

1.1      "Invention" shall mean cytotoxic lymphocyte stimulation by MHC1
         antigen presentation, together with any Technical Information as
         herein defined.

1.2      "Technical Information" shall mean inventions (whether or not
         patentable), trade secrets, processes, formulas and know-how related
         to the subject matter of the Patent Rights that are owned and used  by
         DFCI as of the date of this Agreement or hereafter.  All Technical
         Information  shall be communicated to Corixa in writing.

1.3      "Patent Rights" shall mean the following:

         (a)      the United States patent applications listed in Appendix A
                  and corresponding foreign patent applications;

         (b)     United States and foreign patents issued from the applications
                 listed in Appendix A and from divisionals and continuations of
                 these applications;

         (c)     claims of U.S. continuation-in-part applications, and
                 corresponding foreign patent applications, and of the
                 resulting patents, which are directed to subject matter
                 specifically described in the U.S. and foreign applications
                 listed in Appendix A;

         (d)     claims of all foreign patent applications, and of the
                 resulting patents, which are directed to subject matter
                 specifically described in the United States patents and/or
                 patent applications described in (a), (b) or (c) above.

1.4      "Licensed Products" shall mean any product which, except for the
         license granted herein, would otherwise infringe an issued, unexpired
         claim in the Patent Rights or a pending claim or equivalent thereof
         pending for less than [***] and/or which incorporates or utilizes
         the Technical Information.

1.5      "Licensed Process" shall mean any process which is covered in whole or
         in part by an issued, unexpired claim or a pending claim in the Patent
         Rights and/or which incorporates or utilizes the Technical
         Information.

1.6      "Field of Use" shall mean all uses.

1.7      "Territory" shall mean worldwide.

1.8      "Net Sales" shall mean the gross income derived by Corixa,  its
         Affiliates or its Sublicensees from the sales





Corixa Exclusive License, Execution Copy       -       - Page 2 of 16 -
<PAGE>   3
         of Licensed Products to independent third parties less:

         (a)     Transportation charges or allowances actually paid or granted,
                 including insurance with respect thereto;

         (b)     Trade, quantity, cash or other discounts and brokers' or
                 agents' commissions, if any, allowed and paid by Corixa, its
                 Affiliates or its Sublicencees to independent parties in
                 arms-length transactions;

         (c)     Credits or allowances made or given on account of rejects,
                 returns or retroactive price reductions for any amount not
                 collected;

         (d)     Any tax or governmental charge directly on sale, value added
                 or transportation, use or delivery of products paid by Corixa,
                 its Affiliates or its Sublicencees and not recovered from the
                 purchaser.

         Licensed Products shall be considered "sold" when payment is actually
         received from purchaser.

1.9      "Sublicensee" shall mean any corporation, partnership or business
         organization which is not an affiliate of Corixa but to whom Corixa
         transfers know-how, rights or products to enable said party to sell
         Licensed Products.

1.10     "Affiliate" shall mean any corporation or other business entity
         controlled by, controlling, or under common control with Corixa.  For
         this purpose "control" means direct or indirect beneficial ownership
         of at least fifty percent (50%) interest in the income or stock of
         such corporation or other business.


                               ARTICLE II - Grant

2.1      DFCI hereby grants to Corixa and its Affiliates if any, subject to all
         the terms and conditions of this Agreement including the nonexclusive
         license heretofore granted to the United States Government, the
         exclusive right and license to make, have made, use and sell the
         Licensed Products and to practice the Licensed Process in the
         Territory for the Field of Use for the term of this Agreement unless
         this grant is sooner terminated according to the terms hereof.

2.2      Notwithstanding the provision of Section 2.1, DFCI shall retain the
         right to make, use and practice the technology encompassed by Patent
         Rights for its own non-commercial, basic research purposes.  DFCI or,
         at its option, Corixa on behalf of DFCI, may, subject to DFCI
         providing prior written notice to Corixa, convey to other
         organizations at no charge other than shipping fees research reagents
         inorporating the technology encompassed by Patent Rights which have
         been the subject of publications in the scientific literature, solely
         for use in non-commercial, basic research.  Said transfers shall be
         subject to a material transfer agreement substantially in the form
         contained in Appendix B hereto.





Corixa Exclusive License, Execution Copy       -       - Page 3 of 16 -
<PAGE>   4
2.3      Corixa agrees that Licensed Products sold in the United States shall
         be manufactured substantially in the United States.  This requirement
         shall be included in any sublicense agreements.

2.4(a)   Corixa shall have the right, subject to the terms of this Section, to
         enter into sublicensing agreements with any other entity other than an
         Affiliate for the rights, privileges and licenses granted hereunder at
         royalty rates not less than those delineated in Section 4.3.  DFCI
         shall be informed by written notice of the identity of any prospective
         Sublicensee and shall have the right to approve of said Sublicensee,
         which approval shall not be unreasonably withheld.  If DFCI does not
         object in writing within twenty (20) days of said written notice,
         approval shall be presumed conclusively to have been given.

(b)      Corixa agrees that any sublicenses granted by it shall provide that
         the obligations to DFCI contained in this Agreement shall be binding
         upon the Sublicensee.  Corixa further agrees to attach a copy of this
         Agreement to sublicense agreements.

(c)      With respect to sublicenses granted under this Section, Corixa shall
         pay to DFCI [***] of all fees and lump sum payments, including, but not
         limited to, technology access fees and license issue fees, but
         excluding investments in Corixa equity, milestone payments and research
         funding payments, provided, however, that if no patent within the
         Patent Rights is issued within [***] of the date hereof, any payments
         due to DFCI pursuant to this paragraph 2.4 (c) shall be reduced by
         [***] until any such issuance occurs.

(d)      From any royalties received from its Sublicensee, Corixa shall pay
         DFCI an amount equivalent to the sum DFCI would otherwise have
         received in royalties if Licensed Products were sold by Corixa
         directly. Recording and payment of such royalties shall be made in
         accordance with the provisions of Article IV.

(e)      Corixa agrees to forward to DFCI a copy of any and all fully executed
         sublicense agreements, and further agrees to forward to DFCI annually
         a copy of such reports received by Corixa from its Sublicensee during
         the preceding twelve (12) month period under the sublicenses as shall
         be pertinent to a royalty accounting under said sublicense agreements.

[f)      Corixa hereby agrees that every sublicensing agreement to which it
         shall be a party and which shall relate to the rights, privileges and
         license granted hereunder shall contain a statement setting forth the
         date upon which Corixa's exclusive rights, privileges and license
         hereunder shall terminate.





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                          ARTICLE III - Due Diligence

3.1      Corixa shall use its best commercial efforts to bring one or more
         Licensed Products to market through a thorough, diligent program for
         exploitation of the Patent Rights and to continue active, diligent
         marketing efforts for such Licensed Product(s) throughout the life of
         this Agreement; provided, however, that such efforts shall only be
         required to the extent that the applicable Licensed Product(s)
         warrants such efforts in light of then prevailing market conditions,
         including the existence of new  or more competitive technologies.  In
         addition, within ninety days (90) after the Effective Date and
         annually thereafter, Corixa will submit a project development plan
         showing the time, money and personnel it plans to devote to the
         commercialization of Licensed Products in the next twelve months.
         DFCI and Corixa will mutually agree to this project development plan.

         As part of its best efforts, Corixa will also:

[***]                                                                   By [***]
[***]                                                                   By [***]
[***]                                                                   By [***]
File IND                                                                By [***]

3.2      Corixa's material failure to perform its obligations under Section 3.1
         shall be grounds for DFCI to terminate pursuant to Section 7.5 of this
         Agreement.


                             ARTICLE IV - Payments

4.1      In partial consideration for the license granted hereunder and upon
         execution of this Agreement, Corixa agrees to pay DFCI [***] promptly
         after the Effective Date to offset the legal and administrative
         expenses arising from establishing a proprietary position in the
         Invention and facilitating the transfer of the Invention to the
         commercial marketplace.  Corixa further agrees to issue to DFCI fifty
         thousand (50,000) shares of common stock, to be conveyed promptly after
         the Effective Date of this Agreement, and an additional fifty thousand
         (50,000) shares of common stock, to be conveyed promptly after receipt
         of the issue date of the first patent issued in the U.S., Europe or
         Japan containing claims substantially equivalent to independent claims
         present in the US application listed in Appendix A.  Such common stock
         shall be considered upfront royalties.

4.2      Corixa agrees to make the following payments within forty-five (45)
         days of the occurrence of the 





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         following events

                Initiation of Phase I Clinical Trials                    $[***]

                Initiation of Phase III Clinical Trial                  $[***]

                The first product approval in [***]                     $[***]

         Such payments are to be construed as additional upfront royalties and
         are not offsettable against earned royalties.

4.3      In partial consideration of the license to the Technical Information
         and Patent Rights granted hereunder by DFCI to Corixa, Corixa and/or
         any Sublicensee(s) shall pay royalties on a country-by-country basis
         during the term of this Agreement to DFCI according to the following
         schedule:

         (a)     [***] on the sale of Licensed Products, the manufacture, sale
                 or use of which, except for the license granted herein, would
                 otherwise infringe an issued, unexpired claim within the Patent
                 Rights.

         (b)     [***] on the sale of Licensed Products, the manufacture, use or
                 sale of which utilize only technical information.

4.4      Corixa shall pay a minimum royalty of [***]; provided, however, that
         such minimum royalty for a given year shall be creditable against any
         royalties subsequently due during said year under Section 4.3.  Waiver
         of any minimum payment by DFCI shall not be construed as waiver of any
         such subsequent payment.

4.5      The parties acknowledge that Corixa will require licenses to one or
         more additional technologies to sell Licensed Products and that to
         acquire such licenses Corixa may be required to make additional royalty
         payments to third parties.  If it is necessary for Corixa to obtain
         licenses from third parties such that cumulative royalties on Net Sales
         of any  particular Licensed Product are greater than or equal to [***]
         of Net Sales of such Licensed Product, then the  percentage royalty
         rate on Net Sales of such Licensed Product under Section 4.3 shall be
         reduced on a pro rata basis along with  royalties to be paid to such
         third parties with respect to such Licensed Product to the extent
         necessary so that cumulative royalties on Net Sales of such Licensed
         Product are reduced to less than [***] of Net Sales of such Licensed
         Product; provided, however, that in no event shall royalties due DFCI
         be less than [***] of Net Sales.





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4.6      Payment of royalties specified in Section 4.3 shall be made by Corixa
         to DFCI within forty-five (45) days after March 31, June 30, September
         30 and December 31 each year during the term of this Agreement
         covering the quantity of Licensed Products sold by Corixa during the
         preceding calendar quarter.  The last such payment shall be made
         within forty-five (45) days after termination of this Agreement.

4.7      All payments to be made under this Article shall be paid in United
         States dollars in Boston, Massachusetts, or at such other place and in
         such other way, as DFCI may reasonably designate, without deduction of
         exchange, collection or other charges.

4.8      Only a single royalty shall be paid, either by Corixa or a Sublicensee
         as appropriate, with respect to any Licensed Product, either under
         Section 4.3(a) or 4.3(b) irrespective of the number of claims of
         Patent Rights or Technical Information utilized.

4.9      In the event that any payment due hereunder is not made when due, the
         payment shall accrue interest beginning on the first day following the
         due date as herein specified, calculated at the annual rate of the sum
         of (a) [***] plus (b), the prime interest rate quoted by the Bank of
         Boston on the date said payment is due, the interest being compounded
         on the last day of each calendar quarter, provided that in no event
         shall said annual rate exceed the maximum legal interest rate in
         Massachusetts.  The payment of such interest shall not foreclose DFCI
         from exercising any other rights it may have as a consequence of the
         lateness of any payment.


                        ARTICLE V - Reports and Records

5.1      Corixa shall keep true books of account containing an accurate record
         of all data necessary for the determination of the amounts payable
         under Article IV hereof.  Said records shall be kept at Corixa's
         principal place of business or the principal place of business of the
         appropriate division of Corixa to which this Agreement relates.  Said
         records shall be available for inspection by a certified public
         accountant selected by DFCI and reasonably acceptable to Corixa during
         regular business hours for five (5) years following the end of the
         calendar year to which they pertain in order for DFCI to ascertain the
         correctness of any report and/or payment made under this Agreement.
         The provision of this Section 5.1 shall survive termination of this
         Agreement.

5.2      Within forty-five (45) days after March 31, June 30, September 30 and
         December 31, of each year in which this Agreement is in effect, Corixa
         shall deliver to DFCI full, true and accurate reports of its
         activities and those of its Sublicensee(s), if any, relating to this
         Agreement during the preceding three month period.





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         These reports shall include at least the following:

         (a)     Number of Licensed Products manufactured and sold;

         (b)     Total billings for Licensed Products sold; where applicable,

         (c)     An accounting of all Licensed Processes used or sold;

         (d)     Deductions applicable to a determination of Net Sales;

         (e)     Total royalties due.

5.3      With each such report, Corixa shall pay to DFCI the royalties due and
         payable as provided for in Section 4.6.  If no royalties are due,
         Corixa shall so report.


                ARTICLE VI - Patent Prosecution and Infringement

6.1      DFCI shall apply for, seek prompt issuance of, and maintain during the
         term of this Agreement any Patent Rights in the United States and in
         foreign countries.  The prosecution, filing and maintenance of all
         patents shall be the primary responsibility of DFCI, provided,
         however, that Corixa shall have reasonable opportunity to advise DFCI
         on such matters, such opportunity toinclude the right to review all
         documents intended for submission in the examination of any
         application within the Patent Rights, including patent prosecution in
         foreign countries.  If DFCI is unable or unwilling to do so, DFCI
         shall provide appropriate notice to Corixa, following which Corixa may
         file or prosecute any such patent applications or continue maintenance
         of the patents licensed hereunder.

6.2      Payment of all fees and costs relating to the filing, prosecution and
         maintenance of all patents shall be the responsibility of Corixa,
         whether such fees and costs were incurred before, as provided for in
         Section 4.1, or after the date of this Agreement.  As of the Effective
         Date, the total expenses incurred by DFCI were [***], as delineated
         in Section 4.1.

6.3 (a)  If at any time during the term of this Agreement, Corixa furnishes to
         DFCI reasonably convincing written evidence of an infringement of a
         patent included in the Patent Rights covering the Invention which
         materially adversely affects the commercial operations of Corixa under
         the license granted hereunder, and DFCI shall within three (3) months
         after receipt of such evidence fail to cause such infringement to
         terminate or to bring a suit or action to compel termination, then in
         each country in which an infringement is occurring, payment of
         royalties and minimum amounts which are earned under Article IV hereof
         shall be waived as long as such infringement continues; provided,
         however, that such royalties and minimum amounts shall not be so
         waived as long as at least one suit or action is being prosecuted by
         DFCI for infringement of a patent covering the Invention and Corixa is
         not enjoined from commercial sales of





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         Licensed Products.  In no event shall such waiver of royalties and
         minimum amounts exceed [***] of the royalties and minimum amounts
         payable hereunder.

    (b)  If after said three (3) months, DFCI fails to cause such infringement
         to terminate or to bring a suit or action to compel termination,
         Corixa shall have the right, but not the obligation, to bring such
         suit or action to compel termination and shall have the right for such
         purpose to join DFCI as a party plaintiff at Corixa's expense.   DFCI
         independently shall have the right to join any such suit or action
         brought by Corixa and, in such event, shall pay one-half of the cost
         of such suit or action from the date of joining.  No settlement,
         consent judgment or other voluntary final disposition of the suit may
         be entered into without the consent of DFCI, which consent shall not
         unreasonably be withheld.

    (c)  Any damages recovered by such suit or action shall be first used to
         reimburse each party hereto for the cost of such suit or action
         (including attorney's fees) actually paid by each party hereto as the
         case may be, then to reimburse DFCI for any royalties and minimum
         royalties deferred under this Section 6.3 and of the residue, if any,
         [***] shall go to DFCI and [***] shall go to Corixa.

6.4      In the event that a declaratory judgment action alleging invalidity or
         noninfringement of any of the Patent Rights shall be brought by a
         third party, DFCI, at its sole option, shall have the right, within
         thirty (30) days after commencement of such action, to takeover the
         entire defense of the action, provided Corixa is allowed to consult
         during such actions.

6.5      In any infringement suit as either party may institute to enforce the
         Patent Rights pursuant to this Agreement, the other party hereto
         shall, at the request and expense of the party initiating such suit,
         cooperate in all respects and, to the extent possible, have its
         employees testify when requested and make available relevant records,
         papers, information, samples and the like.


                       ARTICLE VII - Term and Termination

7.1      Unless earlier terminated as hereinafter provided, this Agreement
         shall remain as an exclusive Agreement and in full force and effect
         for the life of the last to expire patent issued under the Patent
         Rights.

7.2      If Corixa shall cease to carry on its business with respect to
         Licensed Products, this Agreement shall terminate upon notice by DFCI.





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7.3      Should Corixa fail to pay DFCI such royalties as are due and payable
         hereunder, DFCI shall have the right to terminate this Agreement
         ninety (90) days after providing Corixa written notice of Corixa's
         failure to pay such royalties, unless Corixa shall pay DFCI within
         such notice period, all such royalties and interest that are due and
         payable. Upon the expiration of the ninety (90) day period, if Corixa
         shall not have paid all such royalties and interest due and payable,
         DFCI, at its sole option, may immediately terminate this Agreement and
         all rights, privileges and license hereunder granted.

7.4      Corixa shall have the right to terminate this Agreement at any time
         upon six (6) months written notice to DFCI, and upon payment of all
         amounts due DFCI through the effective date of termination.

7.5      Upon any material breach or material default of this Agreement by
         Corixa, other than those delineated in Sections 7.2 and 7.3 which
         shall always take precedence in that order over any material breach or
         default referred to in this Section 7.5, DFCI shall have the right to
         terminate this Agreement and the rights, privileges and license
         hereunder granted upon ninety (90) days written notice to Corixa.
         Such termination shall become effective immediately at the conclusion
         of such notice period unless Corixa shall have cured any such breach
         or default prior to the expiration of the ninety (90) day period.

7.6      Upon termination of this Agreement for any reason, nothing herein
         shall be construed to release either party from any obligation that
         matured prior to the effective date of such termination.  Corixa and
         any Sublicensee thereof may, after the effective date of such
         termination, sell all Licensed Products which are in inventory at the
         time of termination, and complete and sell Licensed Products which
         Corixa can clearly demonstrate were in the process of manufacture at
         the time of such termination, provided that Corixa shall pay to DFCI
         the royalties thereon as required by Article IV of this Agreement and
         shall submit the reports required by Article V hereof on the sales of
         Licensed Products.

7.7      Upon termination of this Agreement for any reason, any sublicense not
         then in default shall continue in full force and effect except that
         DFCI shall be substituted in place of the sublicensor.


                  ARTICLE VIII - Indemnification and Insurance

8.1      Corixa shall indemnify, defend and hold harmless DFCI, Dana-Farber
         Inc., the parent corporation of DFCI, and their respective trustees,
         officers, medical and professional staff, employees, and agents and
         their respective successors, heirs and assigns (the "Indemnitees"),
         against any liability, damage, loss or expense (including reasonable
         attorneys' fees and expenses of litigation) incurred by or imposed
         upon the Indemnitees, or any one of them, in connection with any
         claims, suits, actions, demands or judgments (a)





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         arising out of the design, production, manufacture, sale, use in
         commerce, lease, or promotion by  Corixa or by a licensee, affiliate
         or agent of Corixa,  or any product, process or service relating to,
         or developed pursuant to, this Agreement or (b) arising out of any
         other activities to be carried out pursuant to this Agreement.

8.2      Corixa's indemnification under 8.1 (a) shall apply to any liability,
         damage, loss or expense whether or not it is attributable to the
         negligent activities of the Indemnitees.  Corixa's indemnification
         under 8.1 (b) shall not apply to any liability, damage, loss or
         expense to the extent that it is attributable to (i) the negligent
         activities of the Indemnitees, or (ii) the intentional wrongdoing or
         intentional misconduct of the Indemnitees.

8.3      Corixa agrees, at its own expense, to provide attorneys reasonably
         acceptable to DFCI to defend against any actions brought or filed
         against any party indemnified hereunder with respect to the subject of
         indemnity contained herein, whether or not such actions are rightfully
         brought.

   
8.4      At such time as any product, process or service relating to, or
         developed pursuant to, this Agreement is being commercially
         distributed or sold (other than for the purpose of obtaining
         regulatory approvals) by Corixa or by a licensee, affiliate or agent
         of Corixa, Corixa shall, at its sole cost and expense, procure and
         maintain policies of comprehensive general liability insurance in
         amounts not less than $2,000,000 per incident and $2,000,000 annual
         aggregate and naming the Indemnitees as additional insureds.  Such
         comprehensive general liability insurance shall provide (a) product
         liability coverage and (b) broad form contractual liability coverage
         for Corixa's indemnification under Sections 8.1 and 8.3 of this
         Agreement.  If Corixa elects to self-insure all or part of the limits
         described above (including deductibles or retentions which are in
         excess of $250,000 annual aggregate), such self-insurance program must
         be acceptable to the DFCI and the DFCI's associated Risk Management
         Foundation.  The minimum amounts of insurance coverage required under
         these provisions shall not be construed to create a limit of Corixa's
         liability with respect to its indemnification obligation under
         Sections 8.1 through 8.3 of this Agreement.
    

8.5      Corixa shall provide DFCI with written evidence of such insurance upon
         request of DFCI. Corixa shall provide DFCI with written notice at
         least fifteen (15) days prior to the cancellation, non-renewal or
         material change in such insurance; if Corixa does not obtain
         replacement insurance providing comparable coverage, including self
         insurance, within such fifteen (15) day period, DFCI shall have the
         right to terminate this Agreement effective at the end of such fifteen
         (15) day period without any notice or additional waiting periods.

8.6      Corixa shall maintain such comprehensive general liability insurance
         beyond the expiration or termination





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         of this Agreement during (a) the period that any product, process, or
         service, relating to, or developed pursuant to, this Agreement is
         being commercially distributed or sold (other than for the purpose of
         obtaining regulatory approvals) by Corixa or by a licensee, affiliate
         or agent of Corixa and (b) a reasonable period after the period
         referred to in 8.6 (a) above which in no event shall be less than
         [***].

8.7      In the event any such action is commenced or claim made or threatened
         against DFCI or other Indemnitees as to which Corixa is obligated to
         indemnify it (them) or hold it (them) harmless, DFCI or the other
         Indemnitees shall promptly notify Corixa of such event.  Corixa shall
         assume the defense of, and may settle, that part of any such claim or
         action commenced or made against DFCI (or other Indemnitees) which
         relates to Corixa's indemnification and Corixa may take such other
         steps as may be necessary to protect itself.  Corixa shall not be
         liable to DFCI or other Indemnitees on account of any settlement of
         any such claim or litigation affected without Corixa's consent.  The
         right of Corixa to assume the defense of any action shall be limited
         to that part of the action commenced against DFCI and/or Indemnitees
         which relates to Corixa's obligation of indemnification and holding
         harmless.

8.8      This Article VIII shall survive expiration or termination of this
         Agreement.


                     ARTICLE IX - Disclaimer of Warranties

9.1      DFCI MAKES NO WARRANTY, EXPRESS OR IMPLIED, INCLUDING, WITHOUT
         LIMITATION, ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR OF FITNESS
         FOR A PARTICULAR PURPOSE WITH RESPECT TO ANY PATENT, TRADEMARK,
         SOFTWARE, NON-PUBLIC OR OTHER INFORMATION, OR TANGIBLE RESEARCH
         PROPERTY, LICENSED OR OTHERWISE PROVIDED TO CORIXA HEREUNDER AND
         HEREBY DISCLAIMS THE SAME.

9.2      DFCI DOES NOT WARRANT THE VALIDITY OF THE PATENT RIGHTS LICENSED
         HEREUNDER AND MAKES NO REPRESENTATION WHATSOEVER WITH REGARD TO THE
         SCOPE OF THE LICENSED PATENT RIGHTS OR THAT SUCH PATENT RIGHTS MAY BE
         EXPLOITED BY LICENSEE, AFFILIATE OR SUBLICENSEE WITHOUT INFRINGING
         OTHER PATENTS.  IF BIOLOGICAL MATERIALS ARE LICENSED HEREUNDER, DFCI
         MAKES NO REPRESENTATION THAT SUCH MATERIALS OR THE METHODS USED IN
         MAKING OR USING SUCH MATERIALS ARE FREE FROM LIABILITY FOR PATENT
         INFRINGEMENT.


                              ARTICLE X - Notices





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10.1     Reports, notices and other communications from Corixa to DFCI as
         provided hereunder shall be sent to:

                 Dr. Bernard W. Janicki
                 Director for Research
                 Dana-Farber Cancer Institute
                 44 Binney Street
                 Boston, MA 02115
         or other individuals or addresses as shall hereafter be furnished by
         written notice to Corixa.

10.2     Reports, notices and other communications from DFCI to Corixa as
         provided hereunder shall be sent to:

                 Mark McDade
                 Chief Operating Officer
                 Corixa Corporation
                 1124 Columbia Street, Suite 464
                 Seattle, WA  98104
         or other individuals or addresses as shall hereafter be furnished by
         written notice to DFCI.


                            ARTICLE XI - Arbitration

11.1     Any controversy or claim arising out of, or relating to, any
         provisions of this Agreement or the breach thereof which cannot
         otherwise be resolved by good faith negotiations, or by Alternate
         Dispute Resolution mechanisms other than arbitration which may be
         mutually agreed to, between the parties shall be resolved by final and
         binding arbitration in Boston, Massachusetts under the rules of the
         American Arbitration Association, or the Patent Arbitration Rules if
         applicable, then obtaining.

                 The arbitration shall be subject to the following terms:

         a)      The number of arbitrators shall be one (1).

         b)      The arbitrator shall be an independent, impartial third party
                 having no direct or indirect personal or financial
                 relationship to any of the parties to the dispute, who has
                 agreed to accept the appointment as arbitrator on the terms
                 set out in this Section 11.1.

         c)      The arbitrator shall be an active or retired attorney, law
                 professor, or judicial officer with at least five (5) years
                 experience in general commercial matters and a familiarity
                 with the laws governing proprietary rights in intellectual
                 property.

         d)      The arbitrator shall be selected as follows:

                 (i)      Each party shall submit a description of the matter
                          to be arbitrated to the American Arbitration
                          Association at its Regional Office in Boston,
                          Massachusetts. Said Association shall submit to the
                          parties a list of the arbitrators available to
                          arbitrate any dispute between them.  Thereafter, each
                          party shall select, in numerical order, those





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                          persons on said list acceptable as arbitrators and
                          return the same to the Association.  The first
                          arbitrator acceptable to both parties shall be deemed
                          the selected arbitrator with respect to the dispute
                          then at issue under this Agreement.  In the event of
                          a failure to select a mutually agreeable arbitrator,
                          the Association shall be requested to submit as many
                          subsequent lists of arbitrators as shall be necessary
                          to effect a mutual selection.

                 (ii)     If the method of selection set out in paragraph d)(i)
                          fails for any reason, then either party may petition
                          any state or federal court in Massachusetts having
                          jurisdiction for appointment of the arbitrator in
                          accordance with applicable law, provided that the
                          arbitrator must satisfy the requirements of b) and c)
                          above.

         e)      The arbitrator shall announce the award in writing accompanied
                 by written findings explaining the facts determined in support
                 of the award, and any relevant conclusions of law.

         f)      Unless otherwise provided in this Section 11.1 or extended by
                 agreement of the parties, each party shall submit an initial
                 request for designation of an arbitrator within thirty (30)
                 days after any request for arbitration, the dispute shall be
                 submitted to the arbitrator within ninety (90) days after the
                 arbitrator is selected, and a decision shall be rendered
                 within thirty (30) days after the dispute is submitted.

         g)      The fees of the arbitrator and any other costs and fees
                 associated with the arbitration shall be paid in accordance
                 with the decision of the arbitrator.

         h)      The arbitrator shall have no power to add to, subtract from,
                 or modify any of the terms or conditions of this Agreement.
                 Any award rendered in such arbitration may be enforced by
                 either party in either the courts of the Commonwealth of
                 Massachusetts or in the United States District Court for the
                 District of Massachusetts, to whose jurisdiction for such
                 purposes DFCI and Corixa each hereby irrevocably consents and
                 submits.

11.2     Notwithstanding the foregoing, nothing in this Article shall be
         construed to waive any rights or timely performance of any obligations
         existing under this Agreement.


                   ARTICLE XII - Restrictions on Use of Names

12.      Corixa shall not use the names of DFCI, its related entities and its
         employees, or any adaptations thereof, in any advertising, promotional
         or sales literature, or in any securities reports required by the
         Securities and Exchange Commission, without the prior written consent
         of DFCI in each case; provided however, that Corixa (a) may refer to
         publications by employees of DFCI in the scientific literature or (b)
         may state that a license from DFCI has been granted as herein
         provided.





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                     ARTICLE XIII - Independent Contractor

13.      For the purpose of this Agreement and all services to be provided
         hereunder, both parties shall be, and shall be deemed to be,
         independent contractors and not agents or employees of the other.
         Neither party shall have authority to make any statements,
         representations or commitments of any kind, or to take any action,
         that will be binding on the other party.


                           ARTICLE XIV - Severability

14.      If any one or more of the provisions of this Agreement shall be held
         to be invalid, illegal or unenforceable, the validity, legality or
         enforceability of the remaining provisions of this Agreement shall not
         in any way be affected or impaired thereby.


                         ARTICLE XV - Non-assignability

15.      Neither this Agreement nor any part hereof shall be assignable by
         either party without the express written consent of the other.  Any
         attempted assignment without such consent shall be void, except that
         Corixa may assign this agreement to a third party which acquires its
         entire business interest in the subject matter hereof without DFCI's
         prior written consent.


                         ARTICLE XVI - Entire Agreement

16.      This instrument contains the entire Agreement between the parties
         hereto.  No verbal agreement, conversation or representation between
         any officers, agents, or employees of the parties hereto either before
         or after the execution of this Agreement shall affect or modify any of
         the terms or obligations herein contained.


                    ARTICLE XVII - Modifications in Writing

17.      No change, modification, extension, termination or waiver of this
         Agreement, or any of the provisions herein contained, shall be valid
         unless made in writing and signed by a duly authorized representative
         of each





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         party.


                         ARTICLE XVIII - Governing Law

18.      The validity and interpretation of this Agreement and the legal
         relations of the parties to it shall be governed by the laws of the
         Commonwealth of Massachusetts.


                             ARTICLE XIX - Captions

19.      The captions are provided for convenience and are not to be used in
         construing this Agreement.


                           ARTICLE XX - Construction

20.      The parties agree that they have participated equally in the formation
         of this Agreement and that the language herein should not be
         presumptively construed against either of them.



         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be executed in quadruplicate by their duly authorized representatives as of the
date first above written.

DANA-FARBER CANCER INSTITUTE (DFCI)        CORIXA CORPORATION (Corixa)

By:      /s/ BERNARD W. JANICKI         By:        /s/ MARK MCDADE
         -------------------------              ------------------------
         Bernard W. Janicki, Ph.D.                     Mark McDade

Title:   Director for Research             Title:  Chief Operating Officer


WITNESSED BY:                              WITNESSED BY:

      /s/ Ashley J. Stern                        /s/ Teri Gately
      ------------------------                   ------------------------




Corixa Exclusive License, Execution Copy       -       - Page 16 of 16 -
<PAGE>   17
                                   Appendix A

                    Intellectual Property Licensed Hereunder

[***]







                                      -i-

<PAGE>   18
                                   Appendix B


                          MATERIAL TRANSFER AGREEMENT


         The ________________________ of ______________________ ("Recipient")
and its investigator(s) Dr. ________________________.  ("Investigator"), in
consideration of the receipt of biological materials from Dr._
______________________ of the Dana-Farber Cancer Institute, of Boston, MA
("DFCI"), hereby agree to the following terms and conditions:


         1.      The biological materials to be provided to Recipient and
Investigator are: ____________________ (the "Research Material").  For purposes
of this Agreement, Research Material shall also include progeny and mutations
of the Research Material, unmodified derivatives thereof and any know-how or
data provided with the Research Material.


         2.      The Research Material shall be used exclusively for
non-commercial research by Recipient and Investigator to study
______________________ (the "Research Program").  The Research Material will
not be used in connection with any diagnosis, treatment or any other activity
involving humans or for any use not directly related to the Research Program.
Use will be in compliance with all applicable Federal, State and local laws and
regulations, including, but not limited to, animal welfare laws and
regulations.  In addition, the Research Material may only be possessed or used
by employees of the Recipient who are under the control and supervision of the
Investigator and bound to the terms of this Agreement, and may not be provided
to any other individual, entity or institution, including institutions and
entities affiliated or under contract with the Recipient without the prior
written consent of DFCI.  DFCI may withhold consent for any reason.


         3.      The Research Material is the property of DFCI.  It is agreed
that the transfer of the Research Material hereunder shall not constitute a
sale of Research Material or a grant, option or license of any patent or other
rights, other than as provided in Section 4 below.  DFCI shall retain and have
all right, title and interest in the Research Material.  In addition, Recipient
and Investigator and DFCI agree that ownership of modifications, derivatives,
improvements, results, techniques, inventions, discoveries, ideas, processes,
know-how, patents, patent applications, copyrights, trade secrets and other
proprietary information and rights (collectively, "Intellectual Property")
arising out of or in connection with the Research Material or Recipient's
and/or Investigator's use of the Research Material will be negotiated in. good
faith by the parties based upon (a) their relative contribution to the creation
of said Intellectual property and (b) any applicable laws and regulations
relating to inventions and inventorship.  Recipient and Investigator will not
disclose any Intellectual Property of DFCI without the consent of DFCI, and any
disclosure of Intellectual Property developed during the Research Program will
be made only after first disclosing it to DFCI in a timely manner.


         4.      Recipient and Investigator shall not use or otherwise
distribute Research Material to a third party for any purpose.  This Agreement
and the resulting transfer of Research Material constitute a non-exclusive
license to use the Research Material solely for the basic research or other
not-for-profit purposes described herein.  Recipient and Investigator shall not
use Research Material for any products or processes for profit-making or
commercial purposes or for the benefit of any third party.

<PAGE>   19
         5.      This Agreement is not assignable.


         6.      DFCI has, or may, make Research Material available to others,
both profit and non-profit.


         7.      Recipient and Investigator agree to provide DFCI with a copy
of any publications which contain experimental results obtained from the use of
the Research Material.  Recipient and Investigator will acknowledge DFCI as the
source of the Research Material in all publications containing any data or
information about the Research Material unless DFCI indicates otherwise after
consultation.


         8.      Recipient and Investigator will arrange the return to DFCI or
disposal of any unused Research Material whenever investigation for which it
has been supplied discontinues or is terminated, or upon the request of DFCI.
In the event Investigator(s) transfer to another institution, a new Material
Transfer Agreement is to be executed.


         9.      THE RESEARCH MATERIAL IS UNTESTED AND HAS BEEN GIVEN TO
RECIPIENT AT NO COST.  SUCH RESEARCH MATERIAL IS PROVIDED "AS IS" WITH NO
WARRANTIES EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.
RECIPIENT AND INVESTIGATOR, AS APPLICABLE, BEAR ALL RISK RELATING TO THE
RESEARCH MATERLAL OR ITS USE AND DFCI WILL NOT BE LIABLE UNDER ANY CONTRACT,
NEGLIGENCE, STRICT LIABILITY OR OTHER THEORY FOR ANY DAMAGES INCLUDING, WITHOUT
LIMITATION, DIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR COST OF PROCUREMENT
OF SUBSTITUTE GOODS, SERVICES OR TECHNOLOGY.  DFCI MAKES NO REPRESENTATION AND
PROVIDES NO WARRANT THAT THE USE OF THE RESEARCH MATERIAL WILL NOT INFRINGE ANY
PATENT OR OT'HER PROPRIETARY RIGHT.


         10.      To the extent permitted by law, Recipient agrees to
indemnify, defend and hold harmless DFCI and its trustees, officers, staff,
representatives and agents against all damages, expenses (including without
limitation legal expenses), claims, demands, suits or other actions arising
from Recipient and Investigator's acceptance, use and disposal of the Research
Material and their progeny, mutations or derivatives.


<PAGE>   20
AGREED AND ACCEPTED:


RECIPIENT

By               ______________________________________

Title            ______________________________________

Date             ______________________________________


INVESTIGATOR

By               ______________________________________

Title            ______________________________________

Date             ______________________________________


DANA-FARBER CANCER INSTITUTE

By               ______________________________________
                 Ashley J. Stevens, Ph.D., Director,
                 Office of Technology Transfer

Date             ______________________________________




<PAGE>   1
                                                                   EXHIBIT 10.19

7/23/97            LICENSE, DEVELOPMENT AND SUPPLY AGREEMENT


      This License, Development and Supply Agreement (this "Agreement") is made
as of this _______ day of July, 1997 (the "Effective Date") by and between
Abbott Laboratories, an Illinois corporation, together with its Affiliates (as
defined herein), having its principal place of business at 100 Abbott Park Road,
Abbott Park, Illinois 60064-3500 ("Abbott"), and Corixa Corporation, a Delaware
corporation, having its principal place of business at 1124 Columbia Street,
Suite 200, Seattle, Washington  98104 ("Corixa").

                                   RECITALS

A. Corixa owns intellectual property rights relating to proprietary technology
useful in the diagnosis of tuberculosis.

B. Abbott desires to acquire access to such technology and a non-exclusive
license under such intellectual property rights, and under any intellectual
property rights covering any improvements to such technology to make, have made,
use, import, offer to sell and sell diagnostic products which embody such
technology and are useful in the diagnosis of tuberculosis.

C. Corixa is willing to provide Abbott access to such technology and to grant
Abbott a license under such intellectual property rights in accordance with the
terms and conditions set forth in this Agreement.

D. Corixa is willing to supply to Abbott, and Abbott agrees to purchase from
Corixa under the conditions set forth in this Agreement, certain reagents for
Abbott's use in the manufacture of diagnostic products embodying such
intellectual property rights and technology.

      NOW THEREFORE, in consideration of the premises and the mutual covenants
herein set forth, the receipt and sufficiency of which are hereby acknowledged,
the parties hereto agree as follows:

1.    DEFINITIONS

      In addition to the terms defined elsewhere in this Agreement, the
following words and phrases, whenever capitalized in this Agreement, shall have
the following meanings:

      1.1 "Affiliate" shall mean, with respect to a party, any entity that
controls, is controlled by, or is under common control of a party. For this
purpose, control of an entity shall mean direct or indirect ownership of fifty
percent (50%) or more of the voting interest in, or a fifty percent (50%) or
greater interest in the equity of, such corporation or other business entity, or
the maximum percentage allowed by law in the country of the controlled entity.

      1.2 "Calendar Quarter" shall mean respectively, the three consecutive
month periods of each calendar year: January, February, March; April, May, June;
July, August, September; and October, November and December.

      1.3 "Combination Product" shall mean a Licensed Product that [***]

      1.4 "Contract Year" shall mean a period of twelve (12) consecutive months
during the term of this Agreement, the first Contract Year shall commence on the
date Abbott submits a firm purchase order to Corixa pursuant to Article 9.

      1.5 "FDA" shall mean the United States Food and Drug Administration or any
successor agency thereof.






                                       1

<PAGE>   2
      1.6  "Field" shall mean the in-vitro diagnostic detection and monitoring
of M. tuberculosis in humans. [***]

      1.7  "First Commercial Sale" shall mean the date on which Abbott first
transfers title to Licensed Product in any country within the Territory to a
Third Party. The transfer of a reasonable amount of Licensed Product intended
for clinical use or for the primary purpose of evaluating customer acceptance
shall not be included in the calculation of the First Commercial Sale.

      1.8  "Fully Burdened Manufacturing Cost" shall mean the cost of direct
labor, direct materials and manufacturing overhead incurred in the manufacture
of Materials, such calculation being based upon accepted GAAP.

      1.9  "GAAP shall mean, as of any applicable date of determination,
generally accepted accounting principles consistently applied.
   
      1.10 "GMP" shall mean the FDA's current good manufacturing practices, as
specified in 21 CFR Section 210 and the FDA's guidance documents, and all
successor regulations and guidance documents thereto.

      1.11 "Licensed Know-How" shall mean any and all technical information,
processes, formulae, data, engineering, know-how and trade secrets, in each case
that is Confidential Information under Section 8 of this Agreement, that is
necessary to practice under the Licensed Patents in the Field. By way of
example, Licensed Know-How shall include with respect to Materials, chemical and
analytical methods and data, specifications and pharmacological and
toxicological methods and data.

      1.12  "Licensed Patents" shall mean all:

            (a)   issued patents and patent applications identified in Exhibit A
                  attached hereto and as amended from time to time by the mutual
                  agreement of the parties, and all patents issuing from patent
                  applications identified in Exhibit A from time to time;

            (b)   all patents, patent applications and patents issuing from
                  patent applications that cover peptides and/or proteins which
                  are (i) discovered by Corixa within twelve months of the
                  Effective Date under Corixa's M. tuberculosis diagnostic
                  antigen discovery program and (ii) are not subject to any
                  rights of Third Parties;

            (c)   all patents, patent applications and patents issuing from
                  patent applications arising during the term of this Agreement
                  which claim the priority of the patents and patent
                  applications described in subparagraph (a) and (b) above,
                  including all extensions, renewals, re-examinations,
                  continuations, continuations-in-part, divisions, patents of
                  addition, reissues and foreign counterparts thereof in any
                  country in the world, in each case claiming such priority; and

            (d)   expressly excluding any patents (and patents issuing from
                  patent applications) of Corixa which obligates Corixa to pay
                  license, milestone, royalty or other fees to a third party.


                                       2
<PAGE>   3

      1.13 "Licensed Product" shall mean products which incorporate Materials or
are directly based on Licensed Patents or Licensed Know-How or which, but for
the license granted hereunder, the manufacture, sale or use of would infringe
one or more Valid Claims.

     1.14 "Materials" shall mean the [***], including [***], listed on Exhibit
B, as amended from time to time by the mutual agreement of the parties.

      1.15  "Net Sales" shall mean:

            (a)   the amount invoiced by Abbott or its Affiliates for the sale
                  or other disposition to Third Parties (or to Affiliates that
                  are end users of the Licensed Product) of all Licensed
                  Products, in the Territory, less the following deductions for
                  amounts actually incurred related to the sale or other
                  dispositions:

                  (i)   commercially reasonable quantity, trade and cash
                        discounts or rebates, recalls, credits or allowances and
                        adjustments separately and actually credited to
                        customers for rejections and returns of Licensed
                        Product;

                  (ii)  charges for freight, postage, transportation, import or
                        export taxes, excise taxes and other similar taxes,
                        insurance and other delivery costs not otherwise
                        charged to the customer; and

                  (iii) any tax or other government charges imposed on the
                        sale or use of Licensed Product (other than income
                        tax) levied on its sale, transportation or delivery
                        and borne by Abbott or its Affiliates.

            (b)   With respect to Combination Products, the gross invoiced price
                  of such Combination Products billed to customers by Abbott,
                  less: [***].

            (c)   In the event that a Licensed Product sold by Abbott or its
                  Affiliates is increased in price to include an amount to cover
                  the amortized cost of an instrument system and/or other
                  equipment supplied to a customer by Abbott under a Reagent
                  Agreement Plan, Reagent Rental Plan, or other successor or
                  similar plan (collectively referred to herein as "RAP"), the
                  Net Sales for such Licensed Product on which payments are made
                  pursuant to Article 4 shall be determined by reducing the
                  total Net Sales of such Licensed Product (including the total
                  of sale of the Licensed Product and instrument system RAP) by
                  the amount of the price increase attributable to RAP, using
                  Abbott's standard accounting procedures in accordance with
                  GAAP, provided the minimum amount attributable to the Net
                  Sales of the Licensed Product shall be no less than the per
                  unit current net selling price of the

                                       3
<PAGE>   4
                  Licensed Product as sold alone to non-RAP customers.

            (d)   Net Sales shall not include [***] Licensed Product used in
                  [***].

            (e)   In the event that a Licensed Product is transferred by Abbott
                  or any of its Affiliates to an end user, except as provided in
                  (d) above, free of charge or at a price which is substantially
                  lower than the price that would be charged in an arms length
                  third party transaction, then the Net Sales of such Licensed
                  Product shall be determined using the average selling price of
                  such Licensed Product by Abbott and its Affiliates in arms
                  length Third Party transactions over the same time period or,
                  if no average selling price of such Licensed Product is
                  available as of such date, at a reasonable value (to be agreed
                  upon by the parties) based upon the average selling prices of
                  products available in the marketplace similar to such Licensed
                  Product.

      1.16  "Specifications" means written specifications for the Materials that
will be developed pursuant to Section 10.1 and shall be attached hereto and made
a part hereof as Exhibit C.

      1.17  "Territory" shall mean the entire world.

      1.18  "Third Party" means a party other than Abbott, Corixa or their
Affiliates.

      1.19  "Valid Claim" shall mean, with respect to each individual country in
the Territory, (i) a claim of an issued and unexpired patent included in the
Licensed Patents which claim has not been held invalid or unenforceable by a
final decision, unappealed or unappealable, of a court or agency of competent
jurisdiction or admitted to be invalid by Corixa or one of Corixa's licensors
[or (ii) a claim of a pending patent or patent application included in the
Licensed Patents, which claim has been pending less than five (5) years.]

      1.20  Singular and Plural. Where the context herein requires, the singular
number shall be deemed to include the plural and vice versa.

2.    LICENSE GRANT

      2.1   License. Corixa hereby grants to Abbott a non-exclusive license,
without the right to sublicense, under Licensed Patents and Licensed Know-How to
use, make, have made, sell, offer to sell, import or otherwise distribute
Licensed Products within the Territory for use solely in the Field. Subject to
Section 12 hereof, Abbott shall have no right to make or have made any Materials
or other subject matter claimed in the Licensed Patents or a part of the
Licensed Know-How.

   
      2.2   [Favored Terms.  If, during the term of this Agreement, Corixa
grants another license in the Field for an identical antigen or antigens to
any Third Party under Licensed Patents and Licensed Know-How on overall terms
and conditions which are substantially more favorable to said Third Party with
respect to royalty and supply obligations than those contained herein, Corixa
shall notify Abbott promptly and provide Abbott with all relevant details of
such more favorable royalty and supply obligations.  Abbott shall, by exercise
of notice within ten (10) days of receiving such information from Corixa, have
the benefit of such more favorable royalty and supply obligations commencing
upon the effective date of such other license.]
    

                                       4
<PAGE>   5
3.    MILESTONE AND ROYALTY PAYMENTS

      3.1   License Fee. In consideration of the license granted to Abbott under
Article 2, Abbott shall pay to Corixa a [***] fee of [***] as soon as
practicable, but in no event later than thirty (30) days following the Effective
Date. Such fee shall be non-refundable and non-creditable against any payment
due hereunder, royalty or otherwise.

      3.2   Milestone Payments.

            (a)   Abbott shall pay to Corixa [***] within thirty (30) days
                  following the earlier of (i) Abbott's initiation of clinical
                  trials of Licensed Product, or (ii) the first anniversary of
                  the Effective Date.

            (b)   Abbott shall pay to [***] within thirty (30) days following
                  the earlier of (i) the submission of a data package by Abbott
                  to a regulatory agency outside the U.S. seeking approval or
                  clearance to sell the first Licensed Product under this
                  Agreement outside the United States, or (ii) the first
                  anniversary of the date on which Abbott paid Corixa pursuant
                  to Section 3.2(a) above.

            (c)   Abbott shall pay to Corixa [***] within thirty (30) days
                  following the earlier of (i) the First Commercial Sale outside
                  the United States, or (ii) the first anniversary of the date
                  on which Abbott paid Corixa pursuant to Section 3.2(b) above.

            (d)   Abbott shall pay to Corixa [***] within thirty (30) days
                  following submission of a data package by Abbott to the FDA
                  seeking regulatory approval or clearance to sell the first
                  Licensed Product under this Agreement in the United States.

            (e)   Abbott shall pay to Corixa [***] within thirty (30) days
                  following the First Commercial Sale in the United States.

            (f)   Except with respect to Sections 3.2(d) and (e) above, Abbott
                  shall commit the same level of developmental and commercial
                  diligence towards achieving the above milestones as it would
                  toward any other leading internal project in the field of
                  rapid diagnostics.

      Abbott shall receive a [***]

      3.3   Royalties.

            (a)   Abbott shall pay to Corixa a royalty on Net Sales of each
                  Licensed Product in each country of the Territory. Such
                  royalty shall be calculated as follows: [***] of Net Sales in
                  countries with Valid Claims that cover the Licensed Product,
                  unless [***] 

                                       5
<PAGE>   6
                  for each [***] the [***] royalty rate payable to Corixa
                  hereunder shall [***]. The [***] royalty shall be paid on
                  Licensed Product covered by a Valid Claim on a country by
                  country basis. [***]

            (b)   The obligation to pay royalties to Corixa under this Section
                  3.3 is imposed only once with respect to the same unit of
                  Licensed Product regardless of the number of Valid Claims
                  pertaining thereto. Payments due under this Agreement shall be
                  deemed to accrue when Licensed Products are billed. The
                  royalty payable in countries with issued patents shall be paid
                  for the life time of the patents on a country-by-country
                  basis.

            (c)   No royalties shall be payable on sales of Licensed Product
                  among or between Abbott and its Affiliates, unless such
                  Affiliate in an end user of such Licensed Product.

4.    ROYALTY REPORTS

      4.1   Royalty Payment and Reports. The royalties payable pursuant to
Section 3.3 shall be paid within sixty (60) days after the last day of each
Calendar Quarter with respect to Net Sales occurring during such Calendar
Quarter. Each such payment shall be accompanied by a statement, in sufficient
detail describing the Licensed Products sold, the country of sale, the amount of
Licensed Product sold and the basis for calculating the accrued royalties. After
the First Commercial Sale, such statement shall be prepared whether or not
Abbott has recorded any sales in such Calendar Quarter. All information provided
by Abbott pursuant to this Section shall be deemed Confidential Information.

      4.2   Calculation of Royalty. The calculation of the accrued royalties
payable hereunder shall be based on Net Sales converted to U.S. dollars using
standard conversion methodology, which is consistent with GAAP. The standard
conversion methodology for sales is based on monthly averages (the spot rate for
the end of the month immediately prior to that which payment is due plus the
spot rate for the month ending when payment is due divided by two), using
central bank fixing rates in countries where available and open market rates
otherwise.

      4.3   Country Requirements. If any country restricts the amount payable on
account of Net Sales in such country, the amount due hereunder shall not exceed
the maximum amount payable, under applicable laws, regulations or administrative
rulings of such country. If any Net Sales are made in a currency as to which
conversion into U.S. Dollars is then blocked, Abbott shall make payment in such
local currency, to the extent permitted by U.S. and local law, to an account
designated by Corixa.

      4.4   Payment of Applicable Taxes. If any taxes are imposed on any
payments accruing to Corixa under this Agreement, and are required to be
withheld by Abbott by the relevant taxing authority, such taxes shall be [***],
and when paid by Abbott to the proper taxing authority out of accrued royalties,
proof in evidence of such payment shall be secured and sent to Corixa together
with official or other appropriate evidence issued by the appropriate
governmental authority. All taxes levied on Corixa's income arising from this
Agreement shall be 


                                       6
<PAGE>   7
borne by Corixa. The parties shall take steps consistent with current commercial
practices to: (i) avoid or minimize any such withholding; and (ii) take
advantage of such double taxation avoidance agreements as may be available.

      4.5   Records. Abbott shall keep full, complete and proper records and
accounts of Net Sales of the Licensed Products. Upon reasonable notice to
Abbott, Corixa shall have the right to have an independent certified public
accountant, selected by Corixa and acceptable to Abbott, audit Abbott's records
pertaining to the Licensed Product during normal business hours to verify the
amounts payable pursuant to this Agreement; provided, however that: (i) such
audit shall not take place more frequently than once a year, and (ii) shall not
cover such records for more than the preceding three (3) years. Such audit shall
be at Corixa's expense unless Abbott has paid Corixa less than [***] of the
amount determined to be due for a given time period, in which case such audit
shall be at Abbott's expense. Abbott shall preserve and maintain all such
records and accounts required for audit for a period of three (3) years after
the quarter to which such records and accounts apply.

5.    DEVELOPMENT

      5.1   Project Team. Upon execution of this Agreement, a group shall be
formed consisting of at least one technical representative from both Abbott and
Corixa (the "Project Team") for the purpose of ensuring (a) good communication
between Abbott and Corixa of technical information relative to the development
of Licensed Product, (b) smooth transfer of required Materials, and any [***]
shared between the parties, and (c) adequate support of the manufacturing
scaleup of the Materials. The Project Team shall interface at least [***] in a
mutually agreed format (e.g. in person, by telephone or video conference) during
the period beginning with the Effective Date of this Agreement and ending with
the First Commercial Sale.

      5.2   Supply of Materials for Product Development. During the period
commencing with the Effective Date and terminating with clinical lot preparation
(the "Development Phase"), Corixa agrees to provide to Abbott, [***], reasonable
quantities of Materials to be used for development of Licensed Product. During
the period commencing upon the conclusion of the Development Phase and ending
with the First Commercial Sale (the "Clinical Phase"), Materials required for
use by Abbott will be provided by Corixa under the terms and conditions in
Section 9.2(a).

      5.3   Exchange of [***]. During the Development Phase of the Licensed
Product, both parties agree to make available to the other, [***], reasonable
quantities of [***] to be used for the purpose of evaluating the performance of
the Licensed Product.

6.    INTELLECTUAL PROPERTY

      6.1   Disclosure of Inventions. Each party shall promptly disclose to the
other party all inventions, discoveries and improvements arising from the
development effort undertaken pursuant to this Agreement, whether or not
patentable, made or conceived in the Field (an "Invention").

      6.2   Ownership of Joint Inventions. All Inventions jointly made or
conceived by employees or others acting on behalf of Abbott and Corixa during
the term of this Agreement (a "Joint Invention") shall be jointly owned by both
parties. All costs associated with (a) prosecuting and maintaining such patents
and patent applications, and (b) enforcing such patents against Third Party
infringers shall be shared equally by both parties. In the event that a Joint
Invention is solely related to or has greatest application to Licensed Know-How,
then the prosecution and maintenance of such patents and enforcement of such
patents against Third Party infringers shall be the responsibility of Corixa. In
the event a Joint Invention is solely related to or has greatest application to
Abbott's proprietary technology or know-how, then the prosecution and
maintenance

                                       7
<PAGE>   8
of such patents and enforcement of such patents against Third Party
infringers shall be the responsibility of Abbott. Both parties shall be given
the opportunity to review and comment upon the other's patent applications
covering Joint Inventions and the parties shall mutually agree upon all such
filings. Each party shall keep the other party advised as to all material
developments with respect to all such patents and patent applications. Either
party may assign its interest under any Joint Invention to the other party and
have no further obligation for any prosecution, maintenance, enforcement, cost
and expenses of any patent application or patent covering such Joint Invention
except as to costs and expenses that have accrued prior to such assignment.
[***]

      6.3   Corixa Sole Inventions. All inventions, discoveries and improvements
solely applicable to Licensed Know-How in the Field, whether or not patentable,
made or conceived solely by employees or others acting on behalf of Corixa
during the term of this Agreement ("Corixa Invention"), shall be (i) owned
solely by Corixa, (ii) promptly disclosed in writing to Abbott, (iii) considered
part of Licensed Know-How, and (iv) subject to the terms and conditions of this
Agreement. All costs associated with (a) prosecuting and maintaining such
patents and patent applications, and (b) enforcing such patents against third
party infringers shall be the responsibility of Corixa.

   
      6.4   Abbott Sole Inventions. All improvements, developments,
modifications or derivatives of the Materials or other subject matter claimed in
the Licensed Patents or a part of the Licensed Know-How, whether or not
patentable, made or conceived solely by employees or others acting on behalf of
Abbott during the term of this Agreement ("Abbott Invention"), shall be owned
solely by Abbott. All costs associated with (a) prosecuting and maintaining such
patents and patent applications, and (b) enforcing such patents against third
party infringers shall be the responsibility of Abbott. If Abbott terminates
this Agreement pursuant to Section 13.3 or 13.5 and the rights to an Abbott
Invention are the only intellectual property rights preventing Corixa from
practicing in the Field, then Abbott shall grant Corixa a royalty bearing
non-exclusive license on terms and conditions acceptable to the parties.
    

7.    PATENT ENFORCEMENT

      7.1   Notification of Third Party Infringement of Licensed Patents. If
during the term of this Agreement, either party becomes aware of a Third Party
infringement or threatened infringement (a "Third Party Infringement") of any
Licensed Patent in the Territory, or any misappropriation of Licensed Know-How,
the party having such knowledge shall promptly provide notice to the other
party, with all available details.

      7.2   Corixa's Right to Restrain Infringement. Corixa shall have the
right, but not the obligation, to pursue in its name, at its own expense,
efforts to restrain a Third Party Infringement and to recover profits and
damages. Upon Corixa's request and at Corixa's expense, Abbott shall be joined
as a party plaintiff and shall cooperate in the pursuit thereof, as is
reasonably necessary. If Corixa decides to undertake such action, then Corixa
shall have the sole right to control prosecution, and may retain for its own
account any amounts recovered from Third Parties, but Corixa shall keep Abbott
informed on a regular basis as to the status of such proceeding.

      7.3   Abbott's Right to Restrain Infringement. If Corixa fails to take
action within one hundred eighty (180) days after becoming aware of a Third
Party Infringement, then Abbott, at any time prior to Corixa thereafter taking
action, shall have the right, but not the obligation, to pursue the restraint of
such Third Party Infringement in its own name or in the name of Corixa as it
deems necessary or appropriate (at Abbott's expense), and Corixa hereby consents
and agrees to the use of its name in any such action. Corixa shall cooperate
with Abbott, at Abbott's expense, as is 


                                       8
<PAGE>   9
reasonably necessary in any such action brought by Abbott. If Abbott pursues
legal action, Abbott shall have the sole right to control prosecution, and may
retain for its own account any amounts recovered from Third Parties, but Abbott
shall keep Corixa informed on a regular basis as to the status of such
proceeding.

      7.4   Recovery of Litigation Expenses by Abbott. During the pendency of
any legal proceeding or appeal thereof undertaken by Abbott pursuant to Section
7.3, Abbott shall continue paying royalty to Corixa in accordance with the terms
of this Agreement, but shall be allowed to deposit in an interest-bearing escrow
account with a federally insured bank, [***] of such royalty, provided that
Abbott has first notified Corixa in writing prior to such action. In the event
that Abbott is successful in such legal proceeding or withdraws such action due
to settlement, Abbott shall be entitled to retain the full share of any
recovery, and the escrowed amount shall be released to Corixa. In the event that
Abbott is unsuccessful in such legal proceeding and Corixa fails to reimburse
Abbott for its reasonable expenses, including attorney fees, associated with
such legal proceeding within thirty (30) days following completion of the Third
Party Infringement action, the escrowed royalties shall be released to Abbott in
an amount equal to Abbott's reasonable litigation expenses, with any remaining
funds from the escrow account paid to Corixa.

      7.5   Failure to Resolve Infringement. If within twelve (12) months of the
date of notice of Third Party Infringement in a country, neither Corixa nor
Abbott, for any reason, has effected termination of such infringement, or Corixa
has not granted a license to the infringing party in respect to the
infringement, and where the infringing sales equal or exceed [***] of Abbott's
total Net Sales of Licensed Product in such country, Abbott's royalty payment on
Net Sales of Licensed Product payable to Corixa in such country pursuant to this
Agreement shall be [***], which amount shall be deposited in an interest-bearing
escrow account with a federally insured bank. The funds deposited in such
account shall be released to Corixa upon the earlier of the execution of a
license with the alleged infringer or the issuance of an order in an action
against the alleged infringer or other termination of the infringement;
provided, however, that if within [***] after receiving notice of the Third
Party Infringement Corixa has neither instituted legal proceedings against nor
granted a license to the infringing party with respect to any such Third Party
Infringement, then Abbott's royalty rate on Net Sales of Licensed Product in
such country pursuant to this Agreement shall be [***] until such time as such
Third Party Infringement is terminated and all funds deposited in the escrow
account established pursuant to this Section 7.5 for such country shall be paid
to Abbott.

      7.6   Shared Recovery in a Cooperative Legal Action. In the event Abbott
and Corixa agree to pursue a cooperative legal action related to a Third Party
Infringement and a monetary award is obtained in such action, such award shall
be applied in the following priority: (i) to reimburse Abbott and Corixa by
proportion and up to the extent of their actual out-of-pocket expenses
(including reasonable attorney fees) in prosecuting such action; (ii) to be
shared by proportion and up to the extent of any damages established to have
been suffered by either party, including but not limited to Abbott's lost
profits and Corixa's lost royalties; and (iii) the balance, if any, to be shared
equally between Abbott and Corixa.

      7.7   Infringement of Third Party Patents. If any patent infringement or
similar action is brought in a country in the Territory against Abbott, or any
supplier, distributor, or customer of Abbott because of actual or anticipated
manufacture, use or sale of a Licensed Product or use of Licensed Know-How, then
Abbott shall promptly notify Corixa and send Corixa copies of all papers that
have been served. Corixa shall have the right, but not the obligation, to defend
any such action if and to the extent such claims of infringement, violation or
misappropriation are based in the making, using, importing, offering to sell
and/or selling of Materials or the practice of Licensed Patents or the use of
Licensed Know-How. If Corixa decides to undertake such action, then Corixa shall
have the sole right to control prosecution, and may retain for its own account
any amounts recovered from Third Parties, but Corixa shall keep Abbott informed
on a regular basis as 


                                       9
<PAGE>   10
to the status of such proceeding. Abbott shall at all times cooperate with
Corixa, and continue to pay Corixa any applicable royalties during the pendency
of such action and any appeals. Corixa agrees to reimburse Abbott for its
reasonable expenses and/or attorney's fees to the extent these expenses and fees
are related to the assistance provided to Corixa in defending such action or
claim.

      7.8   Failure of Corixa to Defend Third Party Patent Infringement. If
Corixa elects not to defend such infringement action after being notified by
Abbott, Abbott shall have the right to defend the action itself. If Abbott does
undertake such defense, (a) Corixa shall cooperate with Abbott and Abbott shall
be entitled to select legal counsel of its choice and otherwise control all
aspects of the litigation, and (b) Abbott shall be permitted to escrow [***] of
the royalties for Net Sales in the applicable country, which would otherwise be
payable to Corixa hereunder, during the pendency of any such suit or any appeal
taken from it, provided that no escrow offset will be made without prior
notification in writing to Corixa. Upon final decision in favor of Abbott,
unappealed or unappealable, of an administrative agency or court of competent
jurisdiction, payment by Abbott of said royalty amounts escrowed and back due,
shall then be made to Corixa within thirty (30) days of said final decision,
after deduction of the reasonable costs and expenses heretofore set forth in
this Section 7.8 and incurred by Abbott. Upon final decision against Abbott,
unappealed or unappealable, of any administrative agency or court of competent
jurisdiction, such that Abbott must cease the making, using, offering to sell,
selling or importing of Licensed Product, then any amount held in escrow by
Abbott shall be immediately released to Abbott. In the event a final decision is
rendered against Abbott and the escrowed amount is insufficient to reimburse
Abbott for its reasonable costs and expenses, including reasonable attorney
fees, Corixa shall pay Abbott an amount equal to such deficiency, provided such
amount payable by Corixa shall not exceed the royalties paid to Corixa for Net
Sales in the applicable country during the [***] prior to the
establishment of the escrow account by Abbott in accordance with this Section
7.8. If Corixa's payment to Abbott pursuant to the preceding sentence does not
reimburse Abbott fully for its reasonable costs and expenses, [***].

      7.9   Settlement of Legal Action. Any legal action undertaken by Corixa
pursuant to this Article 7, may be settled by Corixa without Abbott's consent,
provided that Abbott is not bound by the terms of such settlement. Any legal
action that Abbott undertakes pursuant to this Article 7 shall not be settled by
Abbott without Corixa's prior written consent, which consent shall not be
unreasonably withheld.

8.    CONFIDENTIALITY

      It is contemplated that in the course of the performance of this Agreement
each party may, from time to time, disclose proprietary and confidential
information to the other ("Confidential Information"). Except to the extent
expressly authorized by this Agreement or otherwise agreed to in writing, during
the term of this Agreement and for a period of five (5) years following the
termination of this Agreement, the receiving party shall take such reasonable
measures to maintain such Confidential Information as confidential as it takes
to protect its own proprietary and confidential information, and shall not
publish or otherwise disclose such Confidential Information. The following
information shall not be considered Confidential Information:

      (a)   information which was already known to the receiving party, other
            than under an obligation of confidentiality to the disclosing party,
            at the time of disclosure by the other party; or

      (b)   information which was generally available to the public or otherwise
            part of the public domain at the time of its disclosure to the
            receiving party; or


                                       10
<PAGE>   11

      (c)   information which becomes generally available to the public or
            otherwise part of the public domain after its disclosure and other
            than through any act or omission of the receiving party in breach of
            this Agreement; or

      (d)   information which was disclosed to the receiving party, other than
            under an obligation of confidentiality, by a third party who had no
            obligation to the disclosing party not to disclose such information;
            or

      (e)   information which was developed independently without reference to
            Confidential Information received from the other party hereunder as
            evidenced by the receiving party's own written records.

      Confidential Information shall include all disclosures hereunder in
writing and identified as being "Confidential", or if disclosed orally, which
are reduced to writing within thirty (30) days of oral disclosure and clearly
identified as being "Confidential". In the event either party must disclose the
other party's Confidential Information in order to comply with applicable
governmental regulations or as otherwise required by law or judicial process,
such party shall give reasonable advance notice to the other party of such
proposed disclosure in order that the non-disclosing party may intercede and
oppose such process, and shall use its best efforts to secure confidential
treatment of such Confidential Information which is required to be disclosed.

9.    PRODUCT SUPPLY

      9.1   Purchase and Sale. Subject to the terms and conditions of this
Agreement, Corixa shall sell and supply to Abbott, and Abbott shall purchase
from Corixa or Corixa's designated Third Party manufacturer all of its
requirements of the Materials, in accordance with Section 9.2. In the event that
additional [***] not covered by Corixa's patents or patent applications are
required for improved Licensed Product performance, Abbott shall be entitled to
purchase and/or license such materials from any Third Party. Upon one hundred
and eighty (180) days prior notice to Abbott, Corixa may delegate the
performance of any or all of its obligations under Articles 9, 10, 11 and 12 of
this Agreement to a Third Party manufacturer (the "Third Party Manufacturer"),
but shall remain primarily liable to Abbott for any failure to fully perform
such obligations.

      9.2   Purchase Price, Price Adjustments and Payment.

            (a)   For Materials sold by Corixa and purchased by Abbott pursuant
                  to this Agreement during the Clinical Phase, Abbott shall pay
                  a purchase price equal to [***] of the Fully Burdened
                  Manufacturing Cost of such Materials calculated in accordance
                  with GAAP (the "Purchase Price"). The Purchase Price for each
                  antigen is set forth on Exhibit D. The parties may amend
                  Exhibit D by mutual written agreement as may be necessary to
                  reflect changes in the estimated cost of each antigen, which
                  Exhibit will be appended to this Agreement prior to the
                  Clinical Phase.

            (b)   For Materials sold by Corixa and purchased by Abbott pursuant
                  to this Agreement, subsequent to the Clinical Phase, Abbott
                  shall pay the Purchase Price, [***]. Corixa agrees to
                  diligently pursue efforts to reduce the overall cost of
                  Materials and will allow representatives of Abbott to audit
                  Corixa's accounting records pertaining to the manufacture of
                  the Materials once per year.



                                       11

<PAGE>   12

            (c)   The Purchase Price may be adjusted once each Contract Year by
                  written notice from Corixa to Abbott at least ninety (90) days
                  prior to the anniversary date of the Contract Year. The
                  adjusted Purchase Price shall become effective for the
                  Materials ordered by and delivered to Abbott during the
                  succeeding Contract Year provided that any such adjusted price
                  for that Contract Year shall not exceed the previous Contract
                  Year price by greater than [***], which last precedes the
                  effective date of the price adjustment.

            (d)   Corixa shall invoice Abbott at the time of or after each
                  shipment of the Materials. Abbott shall pay such invoice
                  within thirty (30) days from the date of receipt of the
                  invoice.

      9.3   Forecast and Orders.

            (a)   Within thirty (30) days of the Effective Date (or a date
                  mutually agreed upon by the parties), Abbott shall furnish to
                  Corixa a rolling quarterly forecast for the quantities of
                  Materials that Abbott intends to order during the twelve (12)
                  month period, commencing no sooner than ninety (90) days from
                  the date of the forecast. Prior to the initiation of Clinical
                  Lots of Licensed Product, such forecast shall be used for
                  planning purposes only. Following initiation of Clinical Lots
                  of Licensed Product, the first [***] months of such forecast
                  shall constitute a binding commitment upon Abbott to purchase
                  such quantities as evidenced by purchase orders received from
                  Abbott in accordance with Section 9.3 (b). The balance of such
                  forecast shall merely represent reasonable estimates for
                  planning purposes only [***]. Abbott shall update such
                  forecast quarterly.

            (b)   Abbott shall place each purchase order with Corixa for
                  Materials to be delivered hereunder at least ninety (90) days
                  prior to the delivery date specified in each respective order.
                  Corixa hereby guarantees such ninety (90) day delivery from
                  the receipt of each purchase order and shall accept such firm
                  orders placed by Abbott within ten (10) days of receipt for
                  that amount of Materials which varies no more than +/- [***]
                  of the then current estimate for the applicable period. For
                  orders of Materials that exceed [***] of the then current
                  estimate for the applicable period, Corixa shall use its
                  reasonable best efforts to meet the ninety (90) day delivery
                  date. If Corixa is unable to deliver on the specified date,
                  Corixa may decline to provide that amount of Materials which
                  exceeds [***] of the most current forecast underlying such
                  order, provided, that it is declined in writing and is
                  delivered to Abbott within ten (10) days of Corixa's receipt
                  of the order. Corixa shall deliver against each such order in
                  accordance with Section 9.4. Abbott shall be obligated to
                  purchase all Materials ordered and delivered by the delivery
                  date, provided, that such Materials is not otherwise rejected
                  pursuant to Section 11.1. The terms and conditions of this
                  Agreement shall control as to a particular order unless
                  otherwise agreed to in writing by the parties.

      9.4   Delivery. Delivery terms shall be F.O.B. Corixa's manufacturing
facility in Seattle, Washington, or other facility as designated by the Third
Party Manufacturer. Corixa shall ship Materials under appropriate storage
conditions in accordance with Abbott's purchase order form.



                                       12
<PAGE>   13

In all other respects, the obligations and rights of the parties shall be
governed by the terms and conditions of this Agreement. None of the general
terms and conditions set forth on any such purchase order form shall be
applicable, and none of the general terms or conditions set forth in any
acknowledgement form used by Corixa shall be applicable.

      9.5   Safety Stock. After the First Commercial Sale, Corixa shall maintain
a fresh safety stock of Materials, equivalent to the forecasted purchases for
the most recent [***] month period, to be exclusively available to Abbott.
Deliveries by Corixa to Abbott may be taken from Corixa's inventory identified
as safety stock. Corixa's safety stock shall be rotated with its regular
inventory of Materials to maintain a reasonable shelf life. Corixa shall keep
Abbott reasonably informed of the level of inventory identified as the safety
stock. In the event of termination of this Agreement, Abbott will be obligated
to purchase the unsold portion of such safety stock from Corixa, to the extent
the quantity on termination is equal to or less than the most recent [***] month
forecast.

10.   PRODUCT MANUFACTURE

      10.1  Incoming Specifications. The parties will in good faith cooperate
with one another to develop the Specifications, which shall be acceptable to
both parties. The Specifications shall be agreed upon in writing and shall be
incorporated into this Agreement as Exhibit C, as amended from time to time by
the mutual agreement of the parties. The parties may from time to time amend the
Specifications by mutual written agreement without the necessity of amending
this Agreement. Such amended Specifications shall then be deemed the
Specifications as defined in Section 1.16. The Specifications shall be
considered Confidential Information for the purposes of Article 8.

      10.2  Manufacturing Process.

            (a)   Except for Materials manufactured for use in the Development
                  Phase, Corixa or the Third Party Manufacturer, as the case may
                  be, shall manufacture the Materials in accordance with GMP, as
                  required by the United States Food and Drug and Cosmetic Act
                  (the "Act"), together with all pertinent rules and regulations
                  of the FDA, the Specifications, and all other applicable
                  national, state and local laws, regulations, and guidelines.

            (b)   In the event that a regulatory submission or country
                  registration requires the disclosure of information regarding
                  the manufacturing process used in connection with the
                  Materials to be supplied under this Agreement, Corixa shall
                  promptly disclose all such information to the appropriate
                  governmental authority. Such information shall be considered
                  Confidential Information pursuant to Article 8. Corixa shall
                  not modify the processes nor change the materials used in the
                  manufacturing process without the prior written approval of
                  Abbott.

      10.3  Testing of Materials. Corixa shall test or cause to be tested each
batch of Materials manufactured pursuant to this Agreement before delivery to
Abbott. Each test shall set forth the Specifications, the items tested and test
results in a certificate of analysis for each batch delivered. Corixa shall send
or cause to be sent such certificates to Abbott along with delivery of
Materials. Abbott is entitled to rely on such certificates for all purposes of
this Agreement. Nothing in this Agreement shall be construed to require Abbott
to perform any incoming testing, analytical or otherwise, on any Material
received from Corixa. The information in such certificates shall be true in all
material respects. Nothing in this Agreement shall be construed to require
Abbott's verification of the test results used to complete such certificates.


                                      13



<PAGE>   14
      10.4  Certification. Corixa or its designated third party manufacturer
shall use commercially reasonable efforts to become an Abbott approved vendor
within twelve (12) months following the Effective Date.

      10.5  Cease Manufacture. Corixa or the Third Party Manufacturer may elect
to cease supply of Materials to Abbott upon at least twelve months advance
notice to Abbott. Such notice shall include all necessary information to enable
Abbott or any Third Party designated by Abbott to manufacture the Materials in
accordance with the Specifications.

11.   QUALITY ASSURANCE AND INSPECTION

      11.1  Rejected Goods/Shortages.

            (a)   Abbott shall notify Corixa in writing of any claim relating to
                  Materials which do not conform to the Specifications or any
                  shortage in quantity of any shipment of Materials within
                  thirty (30) days of receipt of such shipment. In the event of
                  such rejection or shortage, Corixa shall replace the Materials
                  or make up the shortage within thirty (30) days of receiving
                  such notice, at no additional cost to Abbott, and shall make
                  arrangements with Abbott for the return or destruction of any
                  rejected Materials, such return shipping charges or costs of
                  destruction to be paid by Corixa.

            (b)   In the event of a conflict regarding any nonconforming
                  Materials which Corixa and Abbott are unable to resolve, a
                  sample of such Materials, together with mutually agreed upon
                  questions, shall be submitted by Abbott to an independent
                  laboratory reasonably acceptable to both parties for testing
                  against the Specifications and the test results obtained by
                  such laboratory shall be final and binding upon the parties.
                  The fees and expenses of such laboratory testing shall be
                  borne entirely by the party against whom such laboratory's
                  findings are made. In the event the test results indicate that
                  the Material in question does not conform to the
                  Specifications, Corixa shall replace such Material with
                  conforming Material at no additional cost to Abbott within
                  thirty (30) days after receipt of such results, provided that
                  Corixa has sufficient conforming Material in its inventory to
                  do so. If sufficient conforming Material is not available,
                  Corixa shall use its best efforts to replace the nonconforming
                  Material with conforming Material at no additional cost to
                  Abbott as soon as possible, but in no event shall the
                  replacement time exceed one hundred twenty (120) days.

      11.2  Regulatory.

            (a)   Each party shall keep the other informed of any formal or
                  informal inquiry by any regulatory agency of any state or
                  national government or supranational authority relating to
                  either Materials or Licensed Product used or sold hereunder.

            (c)   Upon reasonable prior notice, but not less than five (5)
                  working days, Corixa shall permit representatives of any
                  regulatory agency having jurisdiction over the manufacture
                  and/or marketing of the Materials or of any diagnostic assay
                  or other product in which the Materials is incorporated, to
                  inspect its facilities in conjunction with the manufacture,
                  testing, packaging, storage, handling and shipping of the
                  Materials. Further, Corixa shall advise Abbott immediately if
                  Corixa receives notice of an impending inspection or if an
                  authorized agent of the FDA or other governmental

                                       14
<PAGE>   15
                  agency visits any of Corixa's manufacturing facilities
                  concerning the Materials. Corixa shall furnish to Abbott any
                  report including any FDA Form 483 notices (or comparable
                  notices of other agencies), regulatory letters or similar
                  documents received from such agency and the application of
                  such report to the Materials, if any, within seven (7) days of
                  Corixa's receipt of such report.

      11.3  Inspection by Abbott. Notwithstanding Corixa's obligation to provide
the certificate set forth in Section 9.9, Corixa shall permit Abbott upon
reasonable prior notice, but not less than five (5) working days, and during
regular business hours, but no more often than once in each contract year,
access to (i) those areas of Corixa's manufacturing facilities where the
Material is manufactured, tested, packaged, stored, handled and shipped, and
(ii) the manufacturing records for the Materials manufactured for Abbott.

      11.4  Recall; MDR; Field Correction. Should any defect or governmental
action relating to the Licensed Product result in (a) the recall, destruction or
withholding from market of the Licensed Product ("Recall"); (b) the issuance of
a Medical Device Report within the meaning of the Act on Licensed Product
("MDR"); or (c) the institution of a field correction of any Licensed Product
("Field Correction"), then Corixa shall reasonably cooperate, at Abbott's
reasonable request, in the resolution of such recall, MDR or Field Correction.
Abbott shall handle notification of customers and returns of Licensed Product
from customers and all FDA communications and requests regarding any Recalls,
MDRs or Field Corrections.

      11.5  Customer Complaints. In the event that Corixa or Abbott receives any
customer complaint regarding a Licensed Product, then that party shall promptly
inform the other concerning the details of any such complaint. The complaint
shall then be evaluated and investigated by Abbott at Abbott's own cost. Corixa
shall assist Abbott in follow-up correction of product complaints, at Abbott's
reasonable request. The cost of any follow-up correction shall be borne by
Corixa up to the extent such complaint is related to the manufacturing of the
Materials by Corixa, or some other cause or event attributable to Corixa, and
shall be borne by Abbott up to the extent such complaint is related to a cause
or event attributable to Abbott.

12.   FAILURE TO SUPPLY

      12.1  Failure. In the event that Corixa is unable, or notifies Abbott that
it is unable, for any reason (including an event of force majeure) to supply
quantities of Materials in accordance with Section 9.3 for a period of 
[***], Abbott may at its discretion (a) require Corixa to supply the
undelivered Materials at a future date agreed upon by the parties; or (b)
manufacture or have manufactured by a Third Party designated by Abbott that
quantity of the Materials required by Abbott which Corixa is unable to supply.
If Abbott determines to manufacture or have manufactured by a Third Party such
Materials, Corixa will give Abbott and/or any such Third Party all necessary
information and cooperation to enable Abbott or such Third Party to manufacture
the Materials in accordance with the Specifications.

      12.2  Supply Resumption. Corixa will have [***] from the original delivery
date of the Materials to Abbott in which to resume supply of the Materials to
Abbott; provided, however, such [***] limitation shall not apply to a failure by
Corixa to supply that results from a force majeure event pursuant to Section
16.6. At the time that Corixa resumes supply of the Materials, Abbott will cease
manufacture of the Materials or have the Third Party cease such manufacture in a
reasonable time and manner, and shall purchase Materials exclusively from
Corixa.


                                       15
<PAGE>   16

13.   TERM / TERMINATION

   
      13.1  Term and Expiration. The initial term of this Agreement shall expire
on the date on which the last patent expires for the Licensed Patents. This
Agreement may be terminated at any time upon the written mutual agreement of the
parties. This Agreement shall be automatically extended for additional one (1)
year terms until such time as either party provides the other with a written
notice of termination at least ninety (90) days prior to any such automatic
annual extension.
    

      13.2  Termination With Cause. Upon any material breach of this Agreement
by either party, the non-breaching party may terminate this Agreement upon
ninety (90) days written notice to the breaching party. The notice shall become
effective at the end of the ninety (90) day period unless the breaching party
shall cure such breach within such period.

      13.3  Acquisition of Corixa. If a Third Party acquires in one transaction
or as a result of a series of transactions at least 50% of the common stock or
equity of Corixa, whether through sale or merger, Corixa shall promptly notify
Abbott of such acquisition or merger (the "Notification Date"). Within
forty-five (45) days of the Notification Date, Abbott shall provide written
notification to Corixa of Abbott's election of either one of the following two
options: (i) that Abbott shall permit such Third Party to assume the terms of
this Agreement in the place of Corixa; or (ii) that Abbott has elected to
terminate this Agreement effective upon Corixa's receipt of Abbott's notice.

      13.4  Termination for Insolvency. Either party may terminate this
Agreement upon written notice to the other in the event of (a) insolvency of the
other party, or the appointment of a receiver by the other party for all or any
substantial part of its properties, provided that such receiver is not
discharged within sixty (60) days of its appointment; (b) the adjudication of
the other party as a bankrupt; (c) the admission by the other party in writing
of its inability to pay its debts as they become due; (d) the execution by the
other party of an assignment for the benefit of its creditors; or (e) the filing
by the other party of a petition to be adjudged as a bankrupt, or a petition or
answer admitting the material allegations of a petition filed against the other
party in any bankruptcy proceeding, or the acts of the other party to any other
judicial proceeding intended to effect a discharge of the debts of the other
party, in whole or in part.

      13.5  Termination by Abbott. Abbott may terminate this Agreement upon
sixty (60) days written notice to Corixa if (a) Abbott fails to achieve any of
the milestones set forth in Section 3.2, (b) Abbott's marketing plans and
projections for the Licensed Product materially change subsequent to the
Effective Date, or (c) Corixa settles any legal action pursuant to Section 7.9
without obtaining Abbott's prior consent.

      13.6  Termination of Supply. Abbott may terminate this Agreement upon
sixty (60) days written notice to Corixa following Abbott's receipt of notice
from Corixa or the Third Party Manufacturer given pursuant to Section 10.5.

      13.7  Consequences of Expiration or Early Termination. Upon the expiration
or early termination of this Agreement:

            (a)   Each party shall return or destroy, and certify to such
                  destruction of, all Confidential Information of the other
                  party, except that each party may maintain one (1) copy for
                  archival purposes solely to confirm compliance with the
                  provisions of Article 8;

            (b)   Abbott shall purchase the safety stock inventory held by
                  Corixa in accordance with Section 9.5 upon early termination
                  by Abbott for any reason, except for breach or failure to
                  supply by Corixa or termination due

                                       16
<PAGE>   17
                  to a force majeure event of Corixa, provided that Abbott may,
                  but is not obligated to, purchase the safety stock upon
                  expiration or any early termination of this Agreement by
                  Corixa for any reason; and

            (c)   Abbott may dispose of, by sale or otherwise, any remaining
                  inventory of Materials, including safety stock, and Licensed
                  Product that Abbott may have in its possession on the date of
                  expiration or early termination of this Agreement, and Abbott
                  shall pay to Corixa any royalties due on the Net Sales of such
                  Licensed Product in the Territory.

      13.8  Inclusive Remedy. Except as otherwise provided in this Agreement,
each party shall have the rights and remedies set forth herein in addition to
any other remedies which it may have under applicable statutory or common law.
Each party shall have the sole discretion to determine which of its rights and
remedies, if any, it shall pursue and such party shall not be required to
exhaust any of its other rights or remedies before pursuing any one of the
rights and remedies set forth in this Agreement.

      13.9  Survival. Expiration or early termination of this Agreement shall
not relieve either party of its obligations incurred prior to expiration or
early termination. The obligations under Sections 11.4, 11.5, 16.2, 16.3, 16.8
and 16.9, and Articles 8, 14 and 15, shall survive expiration or early
termination of this Agreement or of any extensions thereof for a period of ten
(10) years. All licenses hereunder shall survive in accordance with their terms.

14.   REPRESENTATIONS AND WARRANTIES

      14.1  By Corixa. Corixa represents and warrants to Abbott that:

            (a)   as of the Effective Date, it has the full right to enter into
                  and perform Corixa's obligations under this Agreement and to
                  grant the license described in Article 2 and to supply the
                  Materials;

            (b)   as of the Effective Date, it is not a party to, and to the
                  best of its knowledge none of its assets are subject to, any
                  agreements, assignments or encumbrances currently in force
                  that are inconsistent with the provisions of this Agreement;

            (c)   as of the Effective Date and to the best of its knowledge,
                  without having undertaken any special investigation, the
                  manufacture, use, sale, offer to sell or importing of
                  Materials in the Territory does not infringe or violate any
                  patent, trademark, or copyright or any other intellectual
                  property or proprietary rights of any Third Party;

            (d)   as of the Effective Date and to the best of its knowledge,
                  there are no pending actions, either actual or threatened,
                  relating to Licensed Know-How or Licensed Patents;

            (e)   as of the Effective Date, the execution, delivery, and
                  performance of this Agreement does not conflict with, violate,
                  or breach any agreement to which Corixa is a party;

            (f)   no Materials delivered by Corixa under this Agreement will be
                  adulterated or misbranded within the meaning of the Act, or
                  within the meaning of any other applicable law in which the
                  definitions of adulteration or misbranding are substantially
                  the same as those contained in the Act, as such laws are

                                       17
<PAGE>   18

                  constituted and effective at the time of such shipment or
                  delivery, or as an article which may not, under the provisions
                  of Section 404 or 505 of the Act, be introduced into
                  interstate commerce;

            (g)   except for the Materials manufactured for the Development
                  Phase, all Materials supplied by it to Abbott under this
                  Agreement shall conform to the Specifications and be
                  manufactured in accordance with GMP; and

            (h)   it shall not, with respect to any present or future patent or
                  patent application which it owns or under which it has the
                  right to grant licenses of the scope of the licenses granted
                  in this Agreement, or which it shall own or under which it
                  shall have the right to grant licenses of the scope of the
                  licenses granted in this Agreement, assert against Abbott, or
                  its vendees, any claims for infringement based on the
                  manufacture, use, offer to sell, import or sale of Licensed
                  Products made, used or sold by Abbott in accordance with and
                  during the term of this Agreement.

      14.2  By Abbott. Abbott represents and warrants to Corixa that Abbott has
the full right to enter into and perform Abbott's obligations under this
Agreement and that the execution, delivery and performance of this Agreement
does not conflict with, violate, or breach any agreement to which Abbott is a
party.

      14.3  Extent of Warranties. EXCEPT AS SPECIFICALLY PROVIDED IN THIS
AGREEMENT, CORIXA MAKES NO WARRANTIES OF ANY KIND, WHETHER EXPRESS OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE.

15.   INDEMNIFICATION

      15.1  Indemnification by Corixa. In addition to Corixa's indemnity
obligations set forth in Article 7, Corixa shall defend, indemnify and hold
Abbott harmless against any liability, damage, loss, cost or expense, including
legal fees ("Liability"), arising out of or resulting from: (i) Corixa's breach
of any representation or warranty set forth in Section 14.1; (ii) Corixa's
default in the performance of its obligations under this Agreement and failure
or inability to cure such default in accordance with Section 13.2; and (iii) any
third person claims or suits made or brought against Abbott to the extent such
Liability arises out of or relates to Corixa's negligence or willful misconduct
with regard to Corixa's manufacture of the Materials.

      15.2  Indemnification by Abbott. Abbott shall defend, indemnify and hold
Corixa harmless against any Liability arising out of or resulting from: (i)
Abbott's breach of its representations set forth in Section 14.2; (ii) Abbott's
default in the performance of its obligations under this Agreement and failure
or inability to cure such default in accordance with Section 13.2; and (iii) any
third person claims or suits made or brought against Corixa to the extent such
Liability arises out of or relates to Abbott's negligence or willful misconduct
with regard to Abbott's sale or promotion of any Licensed Product.

      15.3  Conditions of Indemnification. The agreement of indemnity set forth
in Section 15.1 and 15.2 above is conditioned upon the indemnified party's
obligation to: (i) advise the indemnifying party of any claim or suit, in
writing, within ninety (90) days after the indemnified party has received notice
of such claim or suit, and (ii) assist the indemnifying party and its
representatives in the investigation and defense of any claim and/or suit for
which indemnification is provided. This agreement of indemnity shall not be
valid as to any settlement of a claim or suit or offer of settlement or
compromise without the prior written approval of the indemnifying party.


                                       18


<PAGE>   19
   
      15.4  Insurance. During the term of this Agreement, Corixa shall, at its
sole cost and expense, obtain and keep in force a policy of comprehensive
general liability insurance with bodily injury, death and property damage limits
of [***] per occurrence and One Million US Dollars (US$1,000,000) per
occurrence and Three Million US Dollars (US$3,000,000) in the aggregate,
including product liability coverage and such additional provisions or coverages
as Abbott may reasonably require. Upon the Effective Date, Corixa shall furnish
a certificate of insurance, in form acceptable to Abbott, evidencing the
insurance required hereunder and providing for at least thirty (30) days prior
written notice to Abbott of any cancellation, termination or change of such
insurance coverage.
    

      15.5  No Consequential Damages. NOTWITHSTANDING ANY OTHER PROVISION OF
THIS AGREEMENT, NEITHER PARTY SHALL BE LIABLE TO THE OTHER WITH RESPECT TO THE
SUBJECT MATTER OF THIS AGREEMENT UNDER ANY CONTRACT, NEGLIGENCE, STRICT
LIABILITY OR OTHER LEGAL OR EQUITABLE THEORY FOR (A) ANY CONSEQUENTIAL,
INCIDENTAL, SPECIAL OR INDIRECT DAMAGES WHATSOEVER, OR (B) THE COST OF
PROCUREMENT OF SUBSTITUTE GOODS, TECHNOLOGY OR SERVICES.

16.   MISCELLANEOUS

      16.1  Notices. All notices, requests or other communications required or
permitted to be given under this Agreement to any party shall be in writing and
shall be deemed to have been sufficiently given when delivered by personal
service or sent by registered mail, telex or facsimile, to the recipient
addressed as follows:

<TABLE>
<S>                                             <C>
      (a)   If to Abbott:                       with a copy to:
                                               
            Abbott Laboratories                 Abbott Laboratories
            Director, Technology Acquisition    Legal Department - International
            Diagnostic Division                 Dept. 323, AP6D-2
            Dept. 9RK-AP6C                      100 Abbott Park Road
            100 Abbott Park Road                      Abbott Park, IL 60064
            Abbott Park, IL 60064               Facsimile: (847) 938-1342
            Facsimile: (847) 937-6951          
                                               
      (b)   If to Corixa:                       with a copy to:
                                               
            Corixa                              Venture Law Group
            1124 Columbia Street                      4750 Carillon Point
            Suite 200                           Kirkland, WA  98033
            Seattle, Washington  98104          Facsimile: (425) 739-8750
            Facsimile:  (206) 667-5715         
                                                Attn:  William W. Ericson
            Attn:  Chief Operating Officer 
</TABLE>

      All such communications shall be deemed to be effective on the day on
which personally served, or, if sent by registered mail, on the fourth day
following the date presented to the postal authorities for delivery to the other
party (the cancellation date stamped on the envelope being evidence of the date
of such delivery), or if by telex or facsimile, on the telex or facsimile date.
Either party may give to the other written notice of change of address, in which
event any communication shall thereafter be given to such party as above
provided at such changed address.



                                       19



<PAGE>   20

      16.2  Publication. If Corixa shall desire to present at symposia, national
or regional professional meetings, or to publish in journals or other
publications any non-Confidential Information derived from or in anyway related
to its activities under this Agreement, Corixa shall first provide Abbott with
copies of the proposed presentation or publication materials at least ninety
(90) days in advance of the presentation or publication date. Within sixty (60)
days after its receipt of such information, Abbott shall advise Corixa whether
Abbott consents to the disclosure of the submitted information. If Abbott does
not provide its written consent thereto, Corixa shall modify the proposed
presentation or publication to Abbott's satisfaction or cancel its plans for
publications. Upon receipt of Abbott's written consent to the proposed
publication or presentation material, as modified to the extent required under
the terms of this Section, Corixa may proceed with the proposed presentation or
publication.

      16.3  Assignment. This Agreement shall be binding upon and inure to the
benefit of the parties hereto and their successors and assigns. Notwithstanding
the foregoing, neither party hereto shall have the right to assign any of its
rights or obligations under this Agreement without the prior written consent of
the other party; provided, however, that either party may assign its rights and
obligations under this Agreement in connection with the sale of all or
substantially all of its assets. This Agreement shall survive the merger of
either party with or into another party and no consent shall be required
hereunder; provided, however, that in the event of the sale of all or
substantially all of a party's assets, no intellectual property rights of the
acquiring Third Party shall be included in the Licensed Patents or the Licensed
Know-How.

      16.4  Waivers. Any waiver by either of the parties hereto of any rights
arising from a breach of any covenants or conditions of this Agreement shall not
be construed as a continuing waiver of other breaches of the same nature or
other covenants or conditions of this Agreement.

      16.5  No Agency, Etc. This Agreement is not intended to create, nor should
it be construed as creating, an agency, joint venture, partnership or
employer-employee relationship between Abbott and Corixa. Each party shall act
solely as an independent contractor and shall have no right to act for or to
sign the name of or bind the other party in any way or to make quotations or to
write letters under the name of the other party or to represent that the party
is in any way responsible for any acts or omissions of such party.

      16.6  Force Majeure. Abbott and Corixa shall not be liable for loss,
damage, detention or delay resulting from any cause whatsoever beyond its
reasonable control or resulting from a force majeure, including, without
limitation, fire, flood, strike, lockout, civil or military authority,
insurrection, war, embargo, container or transportation shortage or delay of
suppliers due to such causes, and delivery dates shall be extended to the extent
of any delays resulting from the foregoing or similar causes. The party so
affected shall give prompt notice to the other party of such cause, and shall
take whatever reasonable steps are necessary to relieve the effect of such cause
as rapidly as reasonably possible. The party giving such notice shall thereupon
be excused from such of its obligations hereunder as it is thereby disabled from
performing for so long as it is so disabled and for thirty (30) days thereafter,
whichever is longer; provided, however, that such affected party commences and
continues to take reasonable and diligent actions to cure such cause.

      16.7  Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of the State of Washington.

      16.8  Public Announcements. The parties agree to consult with each other
before issuing any press release or making any public statement with respect to
this Agreement or any other transaction contemplated herein and, except as may
be required by applicable law or any listing agreement with any national
securities exchange, shall not issue any such press release or make any such
public statement prior to obtaining the written consent of the other party.



                                      20

<PAGE>   21
      16.9  Disputes and Alternative Dispute Resolution. Any dispute or claim
arising out of or in connection with this Agreement (unless otherwise set forth
herein) shall be resolved as follows: (i) for a period of thirty (30) days after
a dispute arises the respective appropriate officers of the parties shall
negotiate in good faith in an effort to resolve the dispute, and (ii) if the
dispute has not been resolved at the close of such thirty (30) day period, the
matter will be finally settled by Alternative Dispute Resolution ("ADR") in
accordance with the provisions set forth herein and attached hereto as Exhibit
E.

      16.10 Severability. If any provision of this Agreement is finally held to
be invalid, illegal or unenforceable by a court or agency of competent
jurisdiction, that provision shall be severed or shall be modified by the
parties so as to be legally enforceable (and to the extent modified, it shall be
modified so as to reflect, to the extent possible, the intent of the parties)
and the validity, legality and enforceability of the remaining provisions shall
not be affected or impaired in any way.

      16.11 Amendments. Except as otherwise expressly provided herein, neither
this Agreement nor any provision hereof may be amended or waived except by a
written instrument signed by the party against whom enforcement of the amendment
or waiver is sought.

      16.12 Headings. The headings of the paragraphs and subparagraphs of this
Agreement have been added for the convenience of the parties and shall not be
deemed a part hereof.

      16.13 Counterparts. This Agreement may be executed in any number of
counterparts, all of which together shall constitute a single Agreement.

      16.14 Final Agreement. This Agreement is the sole understanding and
agreement of the parties hereto with respect to the subject matter hereof and
supersedes all other such prior agreements and understandings.

      IN WITNESS WHEREOF, each of the parties has caused this Agreement to be
executed by its duly authorized representative.

ABBOTT LABORATORIES                           CORIXA


By: /s/ JAY B. JOHNSTON                       By: /s/ MARK McDADE 7/24/97
    ------------------------------                -----------------------
    Jay B. Johnson                                Mark McDade
    Vice President                                Chief Operating Officer
    Diagnostic Assays & Operations


                                      21
<PAGE>   22
                              SCHEDULE OF EXHIBITS


<TABLE>
<S>                   <C>
       Exhibit A -    Attach list of issued patents and patent applications

       Exhibit B -    Attach list of Materials

       Exhibit C -    Attach Specifications

       Exhibit D -    Attach Price Schedule of Individual Antigens that are
                      Materials

       Exhibit E -    Attach Alternative Dispute Resolution Procedure
</TABLE>


<PAGE>   23
                                    EXHIBIT A

                     ISSUED PATENTS AND PATENT APPLICATIONS



U.S. Pat. App. No. [***], entitled [***], filed [***].

U.S. Pat. App. No. [***], entitled [***], filed [***].

U.S. Pat. App. No. [***], entitled [***], filed [***].

U.S. Pat. App. No. [***], entitled [***], filed [***].


<PAGE>   24
                                    EXHIBIT B

                                    MATERIALS



                                     [***]





<PAGE>   25
                                    EXHIBIT C


                                 SPECIFICATIONS





                                     [***]

<PAGE>   26
                                    EXHIBIT D


                                   [TO FOLLOW]



<PAGE>   27
                                    EXHIBIT E

                         Alternative Dispute Resolution



The parties recognize that a bona fide dispute as to certain matters may arise
from time to time during the term of this Agreement which relates to either
party's rights and/or obligations. To have such a dispute resolved by this
Alternative Dispute Resolution ("ADR") provision, a party first must send
written notice of the dispute to the other party for attempted resolution by
good faith negotiations between their respective presidents (or their
equivalents) of the affected subsidiaries, divisions, or business units within
twenty-eight (28) days after such notice is received (all references to "days"
in this ADR provision are to calendar days).

If the matter has not been resolved within twenty-eight (28) days of the other
party's receipt of the notice of dispute, or if the parties fail to meet or
conduct such good faith negotiations by such twenty-eight (28) days, either
party may initiate an ADR proceeding as provided herein. The parties each shall
have the right to be represented by counsel in such a proceeding.

1.  To begin an ADR proceeding, a party shall provide written notice to the
    other party of the issues to be resolved by ADR. Within fourteen (14) days
    after its receipt of such notice, the other party may, by written notice to
    the party initiating the ADR, add additional issues to be resolved within
    the same ADR.

2.  Within twenty-eight (28) days following receipt of the original ADR notice,
    the parties shall select a mutually acceptable neutral to preside in the
    resolution of any disputes in this ADR proceeding. If the parties are unable
    to agree on a mutually acceptable neutral within such period, either party
    may request the President of the CPR Institute for Dispute Resolution
    ("CPR"), 366 Madison Avenue, 14th Floor, New York, New York 10017, to select
    a neutral pursuant to the following procedures:

    (a) The CPR shall submit to the parties a list of not less than five (5)
        candidates within fourteen (14) days after receipt of the request, along
        with a Curriculum Vitae for each candidate. No candidate shall be an
        employee, director, or shareholder of either party or any of their
        subsidiaries or affiliates.

    (b) Such list shall include a statement of disclosure by each candidate of
        any circumstances likely to affect his or her impartiality.

    (c) Each party shall number the candidates in order of preference (with the
        number one (1) signifying the greatest preference) and shall deliver the
        list to the CPR within seven (7) days following receipt of the list of
        candidates. If a party believes a conflict of interest exists regarding
        any of the candidates, that party shall provide a written explanation of
        the conflict to the CPR along with its list showing its order of
        preference for the candidates. Any party failing to return a list of
        preferences on time


<PAGE>   28
         shall be deemed to have no order of preference.

    (d)  If the parties collectively have identified fewer than three (3)
         candidates deemed to have conflicts, the CPR immediately shall
         designate as the neutral the candidate for whom the parties
         collectively have indicated the greatest preference. If a tie should
         result between two candidates, the CPR may designate either candidate.
         If the parties collectively have identified three (3) or more
         candidates deemed to have conflicts, the CPR shall review the
         explanations regarding conflicts and, in its sole discretion, may
         either (i) immediately designate as the neutral the candidate for whom
         the parties collectively have 





                                       -1-
<PAGE>   29
         indicated the greatest preference, or
         (ii) issue a new list of not less than five (5) candidates, in which
         case the procedures set forth in subparagraphs 2(a) - 2(d) shall be
         repeated until the neutral is selected.

3.  No earlier than twenty-eight (28) days or later than fifty-six (56) days
    after selection, the neutral shall select the date(s) on which to hold a
    hearing to resolve each of the issues identified by the parties and shall
    notify the parties of such dates in writing as promptly as possible. The ADR
    proceeding shall take place at a location agreed upon by the parties. If the
    parties cannot agree, the neutral shall designate a location other than the
    principal place of business of either party or any of their subsidiaries or
    affiliates.

4.  At least seven (7) days prior to the hearing date(s) selected by the
    neutral, each party shall submit the following to the other party and the
    neutral:

    (a) a copy of all exhibits on which such party intends to rely in any oral
        or written presentation to the neutral;

    (b) a list of any witnesses such party intends to call at the hearing, and a
        short summary of the anticipated testimony of each witness;

    (c) a proposed ruling on each issue to be resolved, together with a request
        for a specific damage award or other remedy for each issue. The proposed
        rulings and remedies shall not contain any recitation of the facts or
        any legal arguments and shall not exceed one (1) page per issue.

    (d) one (1) brief in support of such party's proposed rulings and remedies,
        provided that the brief shall not exceed twenty (20) pages. This page
        limitation shall apply regardless of the number of issues raised in the
        ADR proceeding.

    Except as expressly set forth in subparagraphs 4(a) - 4(d), no discovery
    shall be required or permitted by any means, including depositions,
    interrogatories, requests for admissions, or production of documents.

5.  The hearing shall be conducted on two (2) consecutive days and shall be
    governed by the following rules:

    (a) Each party shall be entitled to five (5) hours of hearing time to
        present its case. The neutral shall determine whether each party has had
        the five (5) hours to which it is entitled.

    (b) Each party shall be entitled, but not required, to make an opening
        statement, to present regular and rebuttal testimony, documents or other
        evidence, to cross-examine witnesses, and to make a closing argument.
        Cross-examination of witnesses shall occur immediately after their
        direct testimony, and cross-examination time shall be charged against
        the party conducting the cross-examination.

    (c) The party initiating the ADR shall begin the hearing and, if it chooses
        to make an opening statement, shall address not only issues it raised
        but also any issues raised by the responding party. The responding
        party, if it chooses to make an opening statement, also shall address
        all issues raised in the ADR. Thereafter, the presentation of regular
        and rebuttal testimony and documents, other evidence, and closing
        arguments shall proceed in the same sequence.

    (d) Except when testifying, witnesses shall be excluded from the hearing
        until closing 


                                      -2-
<PAGE>   30
        arguments.

    (e) Settlement negotiations, including any statements made therein, shall
        not be admissible under any circumstances. Affidavits prepared for
        purposes of the ADR hearing also shall not be admissible. As to all
        other matters, the admissability of any evidence shall be in accordance
        with the Federal Rules of Civil Procedure.

6.  Within seven (7) days following completion of the hearing, each party may
    submit to the other party and the neutral a post-hearing brief in support of
    its proposed rulings and remedies, provided that such brief shall not
    contain or discuss any new evidence and shall not exceed ten (10) pages.
    This page limitation shall apply regardless of the number of issues raised
    in the ADR proceeding.

7.  The neutral shall rule on each disputed issue within fourteen (14) days
    following completion of the hearing. Such ruling shall adopt in its entirety
    the proposed ruling and remedy of one of the parties on each disputed issue
    but may adopt one party's proposed rulings and remedies on some issues and
    the other party's proposed rulings and remedies on other issues. The neutral
    shall not issue any written opinion or otherwise explain the basis of the
    ruling.

8.  The neutral shall be paid a reasonable fee plus expenses. These fees and
    expenses, along with the reasonable legal fees and expenses of the
    prevailing party (including all expert witness fees and expenses), the fees
    and expenses of a court reporter, and any expenses for a hearing room, shall
    be paid as follows:

    (a) If the neutral rules in favor of one party on all disputed issues in the
        ADR, the losing party shall pay 100% of such fees and expenses.

    (b) If the neutral rules in favor of one party on some issues and the other
        party on other issues, the neutral shall issue with the rulings a
        written determination as to how such fees and expenses shall be
        allocated between the parties. The neutral shall allocate fees and
        expenses in a way that bears a reasonable relationship to the outcome of
        the ADR, with the party prevailing on more issues, or on issues of
        greater value or gravity, recovering a relatively larger share of its
        legal fees and expenses.

9.  The rulings of the neutral and the allocation of fees and expenses shall be
    binding, non-reviewable, and non-appealable, and may be entered as a final
    judgment in any court having jurisdiction.

10. Except as provided in paragraph 9 or as required by law, the existence of
    the dispute, any settlement negotiations, the ADR hearing, any submissions
    (including exhibits, testimony, proposed rulings, and briefs), and the
    rulings shall be deemed Confidential Information. The neutral shall have the
    authority to impose sanctions for unauthorized disclosure of Confidential
    Information.


                                       -3-

<PAGE>   1
                                                                   EXHIBIT 10.20

                 OPTION AND LICENSE AGREEMENT


This Agreement is entered into by and between:

- -        CORIXA CORPORATION, a company duly organized and existing under the
         laws of the State of Delaware, USA, having its principal place of
         business at 1124 Columbia Street, Suite 464, Seattle, Washington 98104,
         USA,

         represented by Mark McDade, Executive Vice President and Chief
         Operating Officer

         (hereinafter referred to as "CORIXA")

and:

- -        PASTEUR MERIEUX SERUMS & VACCINS S.A., a societe anonyme existing and
         organized in accordance with the laws of the Republic of France,
         registered at the Registre du Commerce et des Societes in Lyon under
         N(degrees) RCS B 349 505 370, with a capital of 1.698.859.000 French
         Francs, whose registered head-office is located at 58, avenue Leclerc,
         69007 Lyon, France,

         represented by Mr. Jean-Jacques BERTRAND, Chairman, President and
         Chief Executive Officer,

         (hereinafter referred to as "PMC")


                                   WITNESSETH

WHEREAS, CORIXA has discovered and started to develop the adjuvant properties of
an antigenic protein of Leishmaniasis braziliensis which may be useful in the
formulation of vaccines with enhanced potency;

WHEREAS, CORIXA has generated and owns proprietary rights, including patent
rights and know-how, relating to LeIF and the use of LeIF as an immunoadjuvant;

WHEREAS, PMC is a leading vaccine company with worldwide research, development,
manufacturing and marketing capabilities;

WHEREAS, PMC is currently conducting several research and development programs
aiming at the creation of enhanced vaccines including research and development
of several candidate adjuvants of different chemical or biological definitions,
several vectors and several delivery systems;

WHEREAS, PMC wishes to acquire from CORIXA an option to a worldwide license
under CORIXA's patent rights and know-how related to LeIF for use in certain
fields;
<PAGE>   2

WHEREAS, CORIXA is willing to grant to PMC such an option to such a license in
order to allow PMC to evaluate LeIF in combination with certain of PMC's
proprietary vectors, drug delivery systems and antigens, subject to the terms of
and conditioned upon this Agreement;

NOW, THEREFORE, in consideration of the mutual covenants and obligations set
forth herein, the Parties hereto, intending to be legally bound, agree as
follows:


ARTICLE I - DEFINITIONS AND INTERPRETATION

         1.1.     DEFINITIONS:  For the purposes of this Agreement the following
words and phrases shall have the following meanings:

                  (a) "AFFILIATE" means, with respect to a Party, any person,
corporation or business entity that directly, or indirectly through one or more
intermediaries, controls or is controlled by, or is under common control with, a
Party. For the purpose of this definition, control of a corporation or of
another business entity shall mean direct or indirect beneficial ownership of
fifty percent (50%) or more of the voting interests in, or a fifty percent 
(50%) or greater interest in the equity of, such corporation or other business
entity;

                  (b) "AGREEMENT" means this agreement, all amendments and
supplements to this Agreement and all schedules to this Agreement, including the
following:

     Schedule A     -    Existing Licensed Patents;
     Schedule B     -    Authorized PMC Affiliates;
     Schedule C     -    Material Specifications;
     Exhibit 1      -    Special Biological Materials Transfer Agreement
     Exhibit 2      -    Evaluation Plans
     Exhibit 3      -    Research Program.

                  (c) "CORIXA IMPROVEMENTS" means Improvements which are
conceived, developed or reduced to practice during the term of this Agreement
solely by employees or contractors acting on behalf of CORIXA or its Affiliates,
to the extent that CORIXA has now or hereafter shall have the right to grant
licenses, immunities or other rights thereon.

                  (d) "CORIXA RESEARCH PATENTS" has the meaning ascribed to it
in Section to it in Section 9.1. hereof;

                  (e) "CORIXA TECHNOLOGY" means the Licensed Patents, the 
Material, the CORIXA Research Patents, the Licensed Know-How and the CORIXA
Improvements;

                  (f) "CALENDAR QUARTER" means any of the three-month periods 
beginning January 1, April 1, July 1 and October 1 in any year;

                  (g) "COMBINATION PRODUCT" has the meaning ascribed to it in
Section 2.4. hereof;



                                      -2-
<PAGE>   3

                  (h) "MATERIAL" or "LeIF" means CORIXA's proprietary antigen of
Leishmania, known as leishmanial eukaryotic initiation factor, either the
protein itself or its cDNA (except as otherwise specified herein), that is the
subject matter of the Licensed Patents;

                  (i) "IMPROVEMENTS" means all patentable or non-patentable
inventions, discoveries, technology and information of any type whatsoever,
including without limitation compositions, chemical compounds, biological
materials, whether or not derived from Material, methods, processes, technical
information, knowledge, experience and know-how which (i) utilize, incorporate,
derive from, are based on or could not be conceived, developed or reduced to
practice but for the use of the CORIXA Technology, (ii) which adds to the
knowledge of the Material, its properties in general or as an immunoadjuvant for
use in vaccines for active immunization or (iii) helps mastering or enhancing
processes for manufacturing Material (for instance, in terms of yield or purity)
or processes for formulating Material in combination with other molecules,
including but not limited to antigenic proteins; and which are conceived,
developed or reduced to practice as a result of and during the term of the
Agreement, solely or jointly by employees or others acting on behalf of CORIXA
or by employees or others acting on behalf of PMC.

                  (ii) "CONFIDENTIAL INFORMATION" has the meaning ascribed to it
in Section 8.1. of this Agreement;

                  (j) "DELIVERY DATE" means the date upon which CORIXA or a
CORIXA's Affiliates shall have delivered to PMC or an Authorized PMC Affiliate
that PMC shall designate, quantities of Material meeting Material Specifications
as described in Schedule C hereto sufficient to enable PMC and its Affiliates to
implement the Evaluation Plans during the Option Period and to evaluate PMC's
interest in exercising the Option;

                  (jj) "EVENT OF FORCE MAJEURE" has the meaning ascribed to it
in Article 16 of this Agreement;

                  (k) "EVALUATION PLANS" means the evaluation plans established
by PMC and agreed to and accepted by CORIXA with respect to each Field of Use
which describe evaluation works that shall be performed by PMC in each Field of
Use during the Option Period, and which are attached hereto as Exhibit 2;

                  (l) "FIELDS OF USE" means the use of LeIF as an adjuvant in
[***] vaccines for [***] immunization ([***]) against the following infectious
diseases: (i) Influenza, (ii) Acquired Immunodeficiency Syndrome ("AIDS"), (iii)
Malaria, (vi) Respiratory Syncitial Virus ("RSV") and (v) Mycobacterium
Tuberculosis; and "Field of Use" (singular) means any one of the foregoing, and
further provided that the [***];

                  (m) "FIRST COMMERCIAL SALE" means, in each country of the
Territory, the first commercial sale of a Product by PMC, its Affiliates or
Sublicensees to a Third-Party following, if required by law, approval of its
marketing and its pricing by the appropriate governmental agency for the country
in which the sale is to be made and, when such approval is not required by 

                                      -3-
<PAGE>   4

law, the first commercial sale in that country, in each case for use or
consumption of such Product in such country by the general public; for avoidance
of doubt, First Commercial Sale of a given Product cannot occur more than once
in any particular country of the Territory;

                  (n) "JOINT RESEARCH PATENTS" has the meaning ascribed to it
in Section 9.2.2 hereof;

                  (mm) "JOINT RESEARCH PATENTS" shall have the meaning assigned
to it in Section 9.2.2 hereof;

                  (n)  "LICENSE" has the meaning ascribed to it in 
Section 2.3.1. of this Agreement;

                  (nn) "LICENSED KNOW-HOW" means any and all technical
information, processes, formulae, data, engineering, technical and shop
drawings, inventions, shop-rights, chemical compounds, know-how and trade
secrets, in each case that is Confidential Information according to Article 8,
that is useful or necessary to make, have made, use or sell Products or to
practice under the Licensed Patents and/or the Joint Research Patents in the
Field of Use, which have been, or hereafter are, either developed by CORIXA or
its Affiliates, or the rights to which in the Field of Use have been acquired by
CORIXA or its Affiliates. In particular, but without prejudice to the generality
of the foregoing, Licensed Know-How shall include, with respect to Material,
chemical and analytical methods and data, Material specifications,
pharmacological and toxicological methods and data;

                  (o)      "LICENSED PATENTS" means:

                            (i) any existing patents and patent applications 
isted in Schedule A to this Agreement;

                           (ii) any future patents issued from any patent 
applications referred to in Paragraph 1.1.(o).(i) above and any future patents
issued from a patent application filed in any country in the Territory which
corresponds to a patent or patent application identified in Paragraph
1.1.(o).(i) above;

                          (iii) any future patent issued, assigned or licensed
to CORIXA or its Affiliates or to any employee, contractor, subcontractor or
agent of the foregoing from a patent application filed in any country, useful or
necessary to make, have made, use or sell Products or to make, have made or use
Material;

                           (iv) any reissues, confirmations, renewals, 
extensions (including but not limited to extensions referred to in Article 11
hereof), counterparts, divisions or continuations issued, assigned or licensed
to CORIXA or its Affiliates of or relating to the patents or patent applications
identified in Paragraph 1.1.(o).(i), (ii) and (iii) above; and


                                      -4-
<PAGE>   5


                           (v)  any continuations-in-part or patent-of-addition
issued, assigned or licensed to CORIXA or its Affiliates and of or relating to
the patents or patent applications identified in Paragraph 1.1.(o).(i), (ii) or
(iii) hereof;

                           (vi) any CORIXA Research Patents and CORIXA's 
interest in Joint Research Patents;

                  For greater certainty, whenever used, "Licensed Patents"
include the inventions disclosed in and the subject matter of patent
applications;

                  (p) "MTA" means the Special Material Transfer Agreement 
attached hereto as Exhibit 1;

                  (q) "NET SALES" means the gross amount received by PMC, its
Affiliates and Sublicensees from the sale or other disposition of Products to
Third-Parties, less the sum of the following deductions for amounts actually
incurred related to said sale or other disposition:

                           (i)  normal, customary trade discounts (including 
volume discounts), credits and rebates and allowances and adjustments for 
rejections, recalls and returns;

                           (ii) cost of freight and insurance, sales, use, 
excise, value-added and similar taxes and duties imposed on the sale and
included in the gross amount charged to customers, and government-mandated
vaccine insurance premium;

                  (r)  "NOTICE OF DISPUTE" has the meaning ascribed to it in 
Section 19.3.(a) of this Agreement;

                  (s)  "OPERATIONAL DATE" is defined in Section 2.2.4. hereof;

                  (t)  "OPTION" means, with respect to the Fields of Use, the
option granted by CORIXA to PMC pursuant to the provisions of Section 2.2.
hereof to obtain the licenses under Section 2.3. hereof;

                  (tt) "OPTION EXERCISE FEE" has the meaning ascribed to it in 
Section 2.2.4. hereof;

                  (u)  "OPTION FEE" has the meaning ascribed to it in 
Section 2.2.2. hereof;

                  (uu) "OPTION PERIOD" means, with respect to each Field of Use,
the period commencing as of the Delivery Date and continuing until the date
referred to in the Evaluation Plan for such Field of Use, as such Option Period
may be extended pursuant to the provisions of Section 2.2.3. hereof, or
terminated earlier pursuant to the provisions of Article 14 below;

                  (v) "PARTIES" means PMC and CORIXA, and "Party" means any one
 of them;

                 (vv) "PMC RESEARCH PATENTS" has the meaning ascribed to it in
 Section 9.2.3.


                                      -5-
<PAGE>   6

                  (w) "PMC IMPROVEMENTS" means Improvements which are conceived,
developed or reduced to practice during the term of this Agreement, either
during the performance of the Research Program or during subsequent development,
commercialization, marketing and manufacturing of Material and/or Products,
solely by employees or contractors acting on behalf of PMC or its Affiliates, to
the extent that PMC has now or hereafter shall have the right to grant licenses,
immunities or other rights thereon;

                  (ww) "PRODUCT" means any and all products used in the Field of
Use which utilize any or are based on any CORIXA Technology, PMC Improvements or
Joint Inventions, which means that the manufacture, sale or use of such Products
would have constituted a misappropriation of substantial Licensed Know-How,
Material or CORIXA Improvements and/or an infringement of the Licensed Patents
but for the licenses granted in this Agreement;

   
                  (x) "ROYALTY TERM" means, with respect to any Products in each
country in the Territory, the period of time equal to the longer of (a) twelve
(12) years from the date of First Commercial Sale of a Product in such country
or (b) the term for which a Valid Patent Claim in such country remains in effect
and, but for a license granted by this Agreement, would be infringed by the
manufacture, use or sale of such Product in the Field of Use in such country;
    

                  (xx)     "SUBLICENSEES" means any person acting pursuant to a
sublicense granted to it by PMC or its Affiliates under the terms of this
Agreement;

                  (y)      "TERRITORY" means all countries in the world;

                  (yy)     "THIRD-PARTY" means any person other than PMC, CORIXA
 and their respective Affiliates;

                  (z) "VALID PATENT CLAIM" means a claim of an issued and
unexpired patent or patent application included in Licensed Patents or those PMC
Research Patents having a subject matter on Improvement which has not been held
permanently revoked, unenforceable or invalid by a decision of a court or other
governmental agency of competent jurisdiction, unappealable or unappealed within
the time allowed for appeal, and which has not been admitted to be invalid or
unenforceable through reissue or disclaimer or otherwise.

                  (zz) "AUTHORIZED PMC AFFILIATE" shall mean the Affiliates of
PMC that are listed on Schedule B, which may be amended from time to time by
mutual agreement of the parties.

         1.2.     CERTAIN RULES OF INTERPRETATION IN THIS AGREEMENT AND THE 
SCHEDULES.

                  (a)  An accounting term not otherwise defined has the meaning
assigned to it by, and every accounting matter will be determined in accordance
with, generally accepted accounting principles in the United States of America
(US Gaap);

                  (b)  Unless otherwise specified, all references to monetary 
amounts are to United States of America currency (US Dollars);




                                      -6-
<PAGE>   7

                  (c) The descriptive headings of Articles and Sections are
inserted solely for convenience of reference and are not intended as complete or
accurate descriptions of the content of such Articles or Sections;

                  (d) The use of words in the singular or plural, or with a
particular gender, shall not limit the scope or exclude the application of any
provision of this Agreement to such person or persons or circumstances as the
context otherwise permits;

                  (e) Whenever a provision of this Agreement requires an
approval or consent by a Party to this Agreement and notification of such
approval or consent is not delivered within the applicable time limit, then,
unless otherwise specified, the Party whose approval or consent is required
shall be conclusively deemed to have withheld its approval or consent;

                  (f) Unless otherwise specified, time periods within or
following which any payment is to be made or act is to be done shall be
calculated by excluding the day on which the period commences and including the
day on which the period ends and by extending the period to the next business
day following if the last day of the period is not a business day in the
jurisdiction of the Party to make such payment or do such act; and

                  (g) Whenever any payment is to be made or action to be taken
under this Agreement is required to be made or taken on a day other than a
business day, such payment shall be made or action taken on the next business
day following such day in the jurisdiction of the Party to make such payment or
do such act.


ARTICLE 2 - OPTIONS AND LICENSES

         2.1.     RESEARCH LICENSE TO PMC.

                  2.1.1. Subject to the provisions of this Agreement, CORIXA
hereby grants to PMC and to Authorized PMC Affiliates, for the term of the
Option Period, a non-exclusive license in the Territory under the Corixa
Technology on the terms and conditions of the MTA and subject to Section 2.5 and
Article 8 hereof, solely for the purpose of conducting research and development
activities in the Fields of Use relating to the Material and/or Product and
evaluating PMC's interest to exercise the Option by implementing the Evaluation
Plans. The license granted to PMC under this Section 2.1 shall not include (i)
the right to use CORIXA Technology for any commercial purpose whatsoever, (ii)
the right to grant sublicenses thereto to any Affiliate or Third-Party, (iii)
the right to file a Product License Application in any country, or (iv) the
right to make, have made, use or sell a Product or Material for any purpose
other than the foregoing evaluation, including for any commercial purpose.

                  2.1.2. CORIXA agrees that promptly following the execution of
this Agreement, it shall make available to PMC and/or to Authorized PMC
Affiliates that PMC shall designate such Licensed Know-How (including, but not
limited to, non-published patent applications included in Licensed Patents) and
such quantities of Material as reasonably necessary to enable PMC to conduct its
research and development activities during the Option Period and to evaluate 



                                      -7-
<PAGE>   8

its interest in exercising the Option. All Material supplied by CORIXA to PMC
pursuant to this Section 2.1 shall meet the Material Specifications set forth in
Schedule C hereto, which specifications may be amended from time to time as the
Parties may agree in writing and set forth in a revised Schedule C.

         2.2.     OPTION GRANT.

                  2.2.1.   Grant of the Option.

                           Subject to the provisions of this Agreement, CORIXA
hereby grants to PMC an Option with respect to the Fields of Use, during the
Option Period, to obtain the License set forth in Section 2.3 below. PMC may
exercise the Option at any time on or before the expiration of the Option Period
including any extension thereof; provided , however, that if PMC does not
exercise the Option in at least one (1) Field of Use on or before the later of
(a) July 1, 1997 or (b) six months following the date of PMC's receipt of a
quantity of Material meeting the specifications of Schedule C reasonably
sufficient to allow PMC to evaluate its interest in exercising the Option, this
Agreement shall terminate in accordance with Section 14.1.

                  2.2.2.   Option Fee.

                           Upon execution and delivery of this Agreement by both
Parties, PMC shall pay to CORIXA a lump sum payment of [***] by wire transfer of
immediately available funds, which payment shall be nonrefundable and
non-creditable.

                  2.2.3.   Extension of the Option Period.

   
                           Provided that PMC has exercised the Option in at
least one (1) Field of Use in accordance with Section 2.2.1 hereinabove, PMC
shall have the right to extend the Option Period for any other Field of Use for
one (1) additional period of six (6) months by providing written notice to
CORIXA of PMC's intention to extend the Option Period not less than thirty (30)
days prior to the expiration of the initial Option Period.
    

                  2.2.4.   Exercise of the Option.

                           PMC may exercise the Option with respect to any Field
of Use on or before the expiration of the Option Period applicable to such Field
of Use or extension thereof (a) by providing written notice of exercise to
CORIXA not less than thirty (30) days prior to the expiration of the Option
Period or extension thereof, and (b) paying to CORIXA, a nonrefundable,
noncreditable Option Exercise Fee of:

                           (i)  [***] with respect to the Influenza Field of
Use;

                          (ii)  [***] with respect to the AIDS Field of Use;



                                      -8-
<PAGE>   9

                         (iii)  [***] with respect to the Malaria Field of Use;

                          (iv)  [***] with respect to the RSV Field of Use;

                           (v)  [***] with respect to the Tuberculosis Field of
Use.

                           The date upon which a first Option is exercised by
PMC pursuant to this Section 2.2.
is called the "Operational Date."

         2.3.     GRANT OF LICENSES TO PMC.

                  2.3.1.   Grant.

                           If PMC exercises the Option for any Field of Use in
accordance with Section 2.2.4. above, and subject to and conditioned upon the
provisions of this Agreement, CORIXA automatically shall grant to PMC:

                           (i)   a license to the CORIXA Technology in the 
Territory, limited solely to the Field(s) of Use with respect to which the
Option has been so exercised, to make, have made, use and sell Products in such
Field(s) of Use; and

                          (ii)   a license in the Territory, limited solely to
the Field(s) of Use with respect to which the Option has been so exercised, to
make, have made and use the Material under the Licensed Patents and by using the
CORIXA Technology solely in the relevant Field(s) of Use for the purpose of
manufacturing, or having manufactured, Products in accordance with Article 12
hereof (collectively, the "License").

                  2.3.2.   Exclusivity.

                           Subject to and conditioned upon the provisions of
this Agreement, the rights, licenses and privileges granted pursuant to this
Article II in the Influenza Field of Use and the RSV Field of Use shall be
exclusive to PMC as far as any other Person in the world including CORIXA and
its Affiliates is concerned. Without limiting the generality of the foregoing,
CORIXA covenants that during the term of this Agreement, neither CORIXA nor its
Affiliates shall grant to any other person any right, license or privilege to
make, have made, use or sell Products, or to make, have made or use Material, or
to otherwise use or exploit CORIXA Technology, in the Influenza Field of Use and
the RSV Field of Use.

                           The licenses granted pursuant to Section 2.3.1.(i)
in the AIDS, Malaria and Tuberculosis Fields of Use, and the license granted
pursuant to Section 2.3.1.(ii), shall be non-exclusive.

                           For greater certainty,  CORIXA has and retains all 
rights in and to the CORIXA Technology outside the Fields of Use and PMC has no
rights in the CORIXA 



                                      -9-
<PAGE>   10
Technology outside the Fields of Use, and CORIXA retains the right to
manufacture the Material, without prejudice to PMC's right in this respect as
otherwise provided for in this Agreement.

                  2.3.3.   Rights to Sublicense.

                           (i)      PMC shall have the right, with CORIXA's
prior written consent (which consent shall not be unreasonably withheld), to
sublicense the rights granted to PMC pursuant to this Agreement in any Field of
Use to Third-Parties.

                           (ii)     PMC shall have the right, without obtaining
the further consent of CORIXA, to sublicense in any Field of Use all or any
portion of the rights granted to PMC pursuant to this Agreement (i) to any or
all of its Affiliates, and (ii) to any person in any country of the Territory if
required to do so by any governmental authority having jurisdiction in such
country;

                           (iii)    PMC agrees that all sublicenses granted by 
PMC hereunder shall expressly bind Sublicensees to the terms of Article 8,
"Confidentiality." In the event PMC grants sublicenses, PMC shall pay royalties
to CORIXA as if Net Sales of the Sublicensees were Net Sales of PMC;

                           (iv)     PMC shall pay to CORIXA [***] of all upfront
fees, license fees, milestone payments or any similar payments of any kind
received by PMC under any sublicenses granted by PMC to any Third-Party pursuant
hereto, whether in cash or non-cash consideration. If PMC receives non-cash
consideration (including any intellectual property rights) pursuant to any such
Third-Party sub-license, CORIXA shall be entitled to receive a cash payment
equal to [***] of the fair market value of such non-cash consideration, with
such fair market value determined by a New-York-based Third-Party appraiser with
significant background in evaluating the type of non-cash consideration at
issue. Such Third-Party appraiser shall be chosen by mutual agreement of the
Parties;

                           (v)      PMC shall notify CORIXA of each sublicense
granted to Third-Parties and shall provide CORIXA with the name and address of
each Sublicensee and a description of the rights granted and the territory
covered by each sublicenses.

                  2.3.4.   Subcontracting.

                           Notwithstanding anything herein provided for to the
contrary, PMC shall be allowed to (i) sub-contract in whole or in part Product
development to Third-Parties, (ii) appoint sales agents and distributors to
market Product and (iii) sub-contract manufacturing of Product with
Third-Parties or with CORIXA, or CORIXA's Affiliates.

         2.4.     COMBINATION PRODUCTS.

                  The License shall not include a license to make, have made,
use or sell any Product as part of a Combination Product (as defined below).
However, in the event that PMC 


                                      -10-
<PAGE>   11

wishes to sell such Combination Product, the Parties shall at such time
negotiate in good faith the terms upon which a license with respect to
Combination Products might be granted by CORIXA to PMC. Such terms would
include, at a minimum [***] provided it is scientifically established that
Material acts effectively as an adjuvant stimulating and/or enhancing the immune
response with respect to the infectious agent(s) other than those listed in the
definition of the Field of Use for which the concerned Combination Product(s)
claim(s) an active immunization effect. "Combination Product" shall mean a
product that combines a Product and another vaccine for active immunization
against an infectious disease that does not fall under the definition of Field
of Use.

         2.5.     PROCEDURES FOR PROVISION OF KNOW-HOW AND MATERIALS.

                  2.5.1.   Disclosure of Technology.

                           From time to time during the term of this Agreement,
CORIXA shall disclose or cause its Affiliates to disclose to PMC such CORIXA
Technology as reasonably necessary to enable PMC to evaluate, develop,
manufacture and commercialize Products and to manufacture, have manufactured or
use Material in the Fields of Use on the terms and subject to the conditions of
this Agreement. In addition, during the term of this Agreement, CORIXA shall,
upon PMC's reasonable request and with adequate notice to CORIXA, make available
to PMC at PMC's or its Authorized Affiliates' manufacturing facilities or the
facility of a Third-Party manufacturer who shall have contracted with PMC to
manufacture Products or Material, CORIXA's or CORIXA Affiliate's personnel to
provide technical assistance to PMC's personnel, or PMC's Authorized Affiliates'
personnel or Third-Party manufacturer's personnel.

                           PMC shall pay or have paid by its concerned
Affiliates all reasonable and necessary out-of-pocket expenses incurred by
CORIXA or its Affiliates in connection with such technical assistance.

                           The technical assistance to be rendered by CORIXA and
its Affiliates hereunder may include, upon reasonable request by PMC,
demonstration of manufacturing Know-How at a CORIXA's or a CORIXA Affiliate's
facility and disclosure of any and all sources of raw material and list and
specifications of equipment and machinery used in the production of Material
according to the Licensed Know-How.

                  2.5.2.   Communication among Parties.

                           Each of PMC and CORIXA shall appoint a specific 
individual who shall be available and shall act as a liaison person to
facilitate the day-to-day communications among the Parties. The names of the
liaison persons who shall act on behalf of each of the Parties shall be provided
by each of the Parties to the other immediately following the execution of this
Agreement. Each of PMC and CORIXA agrees to notify the other in accordance with
the terms of Section 19.1. of this Agreement in the event of a change in liaison
person.


                                      -11-
<PAGE>   12



                  2.5.3.   Identification of Know-How.

                           The Parties agree that all know-how and Materials to
be transferred to PMC pursuant to this Agreement shall be so transferred in the
case of written know-how memoranda marked confidential and, in the case of
Materials, by clearly marked containers. CORIXA shall clearly designate such
know-how and Materials that are Confidential Information. PMC shall designate an
individual who shall be responsible for receiving the know-how and Materials
from CORIXA and/or its Affiliates and the Parties agree that know-how (where
written) and Materials shall in all cases (except where the Parties agree
otherwise) be sent solely to the attention of such individual.

                           Upon receipt of Know-How and/or Materials, the 
designated individual shall, on behalf of PMC, send an acknowledgment to CORIXA
and/or its Affiliates confirming receipt of the Know-How and/or Materials. The
Parties agree that they shall in good faith work together to establish and
maintain a system to record the transmission of Know-How and/or Materials under
this Agreement and make all commercially reasonable efforts to ensure such
system is followed.

                  2.5.4.   Confidentiality.

                           All written Know-How transferred pursuant to this 
Agreement shall be deemed to be "Confidential Information" in accordance with
Section 8.1.

                  2.5.5.   Supply of Material.

                           CORIXA hereby warrants that any and all quantities of
Material to be supplied pursuant to this Section 2 by CORIXA or its Affiliates
to PMC (except such Material delivered by CORIXA to PMC pursuant to Section
2.1.2.) hereof shall be manufactured in accordance with current Good
Manufacturing Practices (cGMP) as in force in the country where such Material
shall be manufactured or as in force in the country where such Material shall be
used (if more stringent than cGMP applicable in the country of manufacture), and
shall meet Material Specifications as set forth in Schedule C hereto.


ARTICLE 3 - DEVELOPMENT AND COMMERCIALIZATION.

         3.1.     DEVELOPMENT AND COMMERCIALIZATION EFFORTS.

                  PMC shall develop, commercialize and market Products using
efforts at least comparable to the resources PMC invests in its internally
developed priority projects. Without limiting the foregoing, PMC (i) shall
conduct such preclinical and clinical trials as are necessary or desirable to
obtain all regulatory approvals to develop and commercialize such Products as
and where PMC determines are commercially feasible, (ii) shall diligently
develop and obtain necessary approval to market such Products (including, as the
case may be, pricing approval), and (iii) shall commence marketing and market
such Product in each country in which PMC has received all applicable regulatory
approvals therefor. PMC shall comply with all applicable good 



                                      -12-
<PAGE>   13

laboratory, clinical and manufacturing practices in the development and
commercialization of such Products, and shall cause its Affiliates and
subcontractors to do the same.

                  PMC shall be solely responsible for funding all costs of the
development and commercialization of each such Product. PMC shall keep CORIXA
informed in a timely manner as to the progress of the development of Products.

         3.2.     REVERSION OF RIGHTS TO CORIXA.

                  3.2.1.   Failure to meet Milestones.

                           (a)      PMC's rights hereunder shall automatically
become non-exclusive on a field-by-field basis in the Influenza Field of Use and
the RSV Field of Use in the event PMC shall not have achieved the milestone set
forth in Section 4.4.2.(ii) with respect to the Influenza Field of Use or the
milestone set forth in Section 4.4.4.(ii) with respect to the RSV Field of Use,
in the case of the Influenza Field of Use on the [***] anniversary of the
date of delivery of the first clinical lot of Material delivered by CORIXA to
PMC pursuant to Article 12 hereof, and in the case of the RSV Field of Use, on
the [***] anniversary of the commencement date of the first Phase I
clinical trial for a Product in the RSV Field of Use.

                           (b)      PMC's rights hereunder shall terminate on a
field-by-field basis in whichever of the AIDS Field of Use, the Malaria Field of
Use and the Tuberculosis Field of Use PMC shall not have initiated Phase III
clinical trials on the [***] anniversary of the commencement date of the
first Phase I clinical trial for a Product in the relevant Field of Use.

                           (c)      PMC's rights hereunder shall terminate on a
field-by-field basis effective [***] in whichever of the Influenza
Field of Use, the AIDS Field of Use, the Malaria Field of Use and the RSV Field
of Use in the event PMC shall not have commercialized at least one (1) Product
in each Field of Use on or before [***].

                           (d)      PMC's rights hereunder shall terminate in 
the Tuberculosis Field of Use effective [***] in the event PMC shall
not have commercialized at least one (1) Product in the Tuberculosis Field of
Use on or before [***].

                           (e)      If within [***] year following PMC's 
commencement of pivotal clinical efficacy trials for elderly people in the
Influenza Field of Use (the "Elderly Flu Trials"), PMC has not commenced pivotal
clinical efficacy trials for LeIF as a vaccine adjuvant in at least one (1)
additional representative population, PMC's rights hereunder in the Influenza
Field of Use shall be limited to use in elderly people; provided, however, that
if the data received from the Elderly Flu Trials is, in Corixa's reasonable
judgement, sufficient to file a PLA with respect to such additional
representative population, PMC's rights will not be so limited.

                           (f)      If within [***] year following PMC's 
commencement of pivotal clinical efficacy trials for infants in the RSV Field of
Use (the "Infant Flu Trials"), PMC has not commenced pivotal clinical efficacy
trials for LeIF as a vaccine adjuvant in at least one (1) additional
representative population, PMC's rights hereunder in the RSV Field of Use shall
be 



                                      -13-
<PAGE>   14

limited to use in infants; provided, however, that if the data received from
the Infant Flu Trials is, in Corixa's reasonable judgement, sufficient to file a
PLA with respect to such additional representative population, PMC's rights will
not be so limited.


                  3.2.3.   Force Majeure.

                           If PMC's failure to satisfy a milestone under 
Section 3.2.1. above, is due to one or more of the causes specified in Article
16, "Force Majeure," below, the applicable period specified in Section 3.2.1.
above shall be extended for such time as one or more causes specified in Article
16 below continues to exist.

   
                  3.2.4.   Most-Favored Licensee.

                           In the event that CORIXA grants a license to any
Third-Party under CORIXA Technology with respect to a Product in which no other
Corixa technology shall be incorporated in any one or more countries, for which
PMC's License is non-exclusive pursuant to Section 2.3.2, at a royalty rate to
such Third-Party more than twenty-five percent (25%) less than that set forth
in this Agreement and contemplating the use by such Third-Party of antigens
identical to those to be used by PMC hereunder, CORIXA promptly shall notify
PMC thereof.

                           Subject to the provisions of this Section 3.2.4., if
PMC gives written notice to CORIXA within twenty (20) days after PMC's receipt
of such notice from CORIXA, then this Agreement automatically shall be amended
to include the lower royalty rate of such Third Party license with respect to
the License solely for such Product in such one or more countries; provided,
however, the provisions of this Section 3.2.4. shall not apply retroactively so
as to permit PMC to receive a credit for or reduction of past royalties or other
payments accrued or paid prior to granting the more favorable license.
    


ARTICLE 4 - ROYALTIES AND MILESTONES.

         4.1.     ROYALTIES PAYABLE BY PMC.

                  In consideration for the License granted to PMC herein, during
the Royalty Term, PMC shall pay to CORIXA royalties on Net Sales of Products but
for the License granted hereunder would infringe one or more Valid Patent
Claims. Such royalties shall be established at the following rates:

                           (a)      with respect to the Influenza Field of Use 
and the RSV Field of Use, [***], and

                           (b)      with respect to the AIDS Field of Use, the
Malaria Field of Use and the Tuberculosis Field of Use, [***],



                                      -14-
<PAGE>   15

provided, however, that in the event CORIXA transfers Licensed Know-How related
to the manufacture of LeIF to PMC or its Affiliates under Article 12 hereof, the
foregoing royalty rates shall be [***] and [***], respectively.

                  With respect to all countries in which no Valid Patent Claim
exists, the above mentioned royalty rates shall be reduced by [***], except that
in any country in which a Third-Party is commercializing a product that, if sold
in a country in which a Valid Patent Claim exists would infringe such Valid
Patent Claim, the above-mentioned royalty rates shall be reduced by [***].

        4.2.      THIRD-PARTY ROYALTIES.

                  If PMC, its Affiliates or Sublicensees is required to pay
royalties to any Third-Party in order to exercise its rights hereunder to make,
have made, use or sell Products or to make, have made or use Material, then the
royalty rates hereinabove mentioned shall be reduced by the royalty payable by
PMC to such Third-Party, provided, however, that in no event shall the royalty
rate applicable pursuant to this Section 4.2 be less than [***],
except in the event CORIXA transfers Licensed Know-How related to the
manufacture of LeIF to PMC or its Affiliates, in which case the foregoing
minimum royalties shall be [***].

         4.3.     SINGLE ROYALTY:  NON-ROYALTY SALES.

                  It is understood that in no event shall more than one royalty
be payable under Sections 4.1. and 4.2. with respect to a particular unit of
Product. No royalty shall be payable under this Article 4 with respect to sales
of Products among PMC and its Authorized Affiliates, or among Sublicensees and
their Affiliates, or among PMC and its Sublicensees, but a royalty shall be due
upon the subsequent sale of the Product to a Third-Party. [***].

         4.4.     MILESTONE PAYMENTS.

                  As additional consideration for the licenses, rights and
privileges granted to it hereunder, PMC shall pay to CORIXA the following
milestone payments to CORIXA within thirty (30) days of the first occurrence of
each event set forth below with respect to Products, whether such events are
achieved by PMC, its Affiliates or Sublicensees :

                  4.4.1.   In the AIDS Field of Use:

                           (i)      Upon completion of the first Phase I 
clinical trial, [***];

                           (ii)     Upon initiation of the first Phase III 
clinical trial, [***];



                                      -15-
<PAGE>   16

                           (iii)    Upon receipt of the first regulatory 
approval in either [***].

                  4.4.2.   In the Influenza Field of Use:

                           (i)      Upon completion of the first Phase I 
clinical trial [***];

                           (ii)     Upon initiation of the first Phase III 
clinical [***];

                           (iii)    Upon receipt of the first regulatory 
approval for use [***].

                  4.4.3.   In the Malaria Field of Use:

                           (i)      Upon completion of the first Phase I 
clinical trial, [***];

                           (ii)     Upon initiation of the first Phase III 
clinical trial, [***];

                           (iii)    Upon receipt of the first regulatory 
approval in either [***].

                  4.4.4.   In the RSV Field of Use:

                           (i)      Upon completion of the first Phase I 
clinical trial in [***];

                           (ii)     Upon initiation of the first Phase III 
clinical trial in [***];

                           (iii)    Upon receipt of the first regulatory 
approval for use [***].

                  4.4.5.   In the Tuberculosis Field of Use:

                           (i)      Upon completion of the first Phase I 
clinical trial, [***];

                           (ii)     Upon initiation of the first Phase III
clinical trial, [***];



                                      -16-
<PAGE>   17

                           (iii)    Upon receipt of the first regulatory 
approval in either [***].

                  4.4.6. The milestone payments set forth above shall each be
payable [***]. Payments of milestone by PMC to CORIXA shall be made net of
applicable withholding tax, if any.

ARTICLE 5 - ROYALTY REPORTS AND ACCOUNTING.

         5.1.     REPORTS, EXCHANGE RATES.

                  During the term of this Agreement following the First
Commercial Sale and during the Royalty Term, PMC shall furnish to CORIXA, with
respect to each Calendar Quarter, a written report showing on a consolidated
basis in reasonably specific detail, on a country-by-country basis, (a) the
gross sales of Products sold by PMC, its Affiliates and its Sublicensees in the
Territory during the corresponding Calendar Quarter and the calculation of Net
Sales from such gross sales; (b) the royalties payable in US dollars, if any,
which shall have accrued hereunder based upon Net Sales of Products (c) the
withholding taxes, if any, required by law to be deducted in respect of such
royalties; (d) the date of the First Commercial Sales of Product having occurred
in each country in the Territory during the corresponding Calendar Quarter; and
(e) the exchange rates used in determining the royalty amount expressed in US
dollars.

                  With respect to sales (if any) of Products invoiced in US
dollars, the gross sales, Net Sales, and royalties payable shall be expressed in
US dollars. With respect to sales of Products invoiced in a currency other than
US dollars, the gross sales, Net Sales and royalties payable shall be expressed
in the currency of the invoice issued by the Party making the sale together with
the US dollars equivalent of the royalty payable, calculated using the rate of
exchange published in the Wall Street Journal for the last business day of the
applicable Calendar Quarter.

                  Reports shall be due on the forty-fifth (45th) day following
the close of each Calendar Quarter. PMC shall keep complete and accurate records
in sufficient detail to properly reflect all gross sales and Net Sales and to
enable the royalties payable hereunder to be determined.

         5.2.     AUDITS.

                  5.2.1. Upon the written request of CORIXA and not more than
once in each calendar year, PMC shall permit an independent certified public
accounting firm of internationally recognized standing, selected by CORIXA and
reasonably acceptable to PMC, at CORIXA's expense, to have access during normal
business hours to such of the records of PMC and its Affiliates as may be
reasonably necessary to verify the accuracy of the royalty reports hereunder for
any year ending not more than [***] prior to the date of such




                                      -17-
<PAGE>   18

request. The accounting firm shall disclose to CORIXA only whether the records
are correct or not and the specific details concerning any discrepancies. No
other information shall be shared.

                  5.2.2. If such accounting firm concludes that additional
royalties were owed during such period, PMC shall pay the additional royalties
within thirty (30) days of the date CORIXA delivers to PMC such accounting
firm's written report so concluding. The fees charged by such accounting firm
shall be paid by CORIXA; provided, however if the audit discloses that the
royalties payable by PMC for the audited period are more than [***] of the
royalties actually paid for such period, then PMC shall pay the reasonable
fees and expenses charged by such accounting firm.

                  5.2.3. PMC shall include in each permitted sublicense granted
by it pursuant to the Agreement a provision requiring its Affiliates and
Sublicensees to make reports to PMC, to keep and maintain records of sales made
pursuant to such sublicense and to grant access to such records by CORIXA's
independent accountant to the same extent required with respect to PMC's records
under this Agreement.

                  5.2.4. Upon the expiration of [***] following the end of any
calendar year, the calculation of royalties payable with respect to such year
shall be binding and conclusive upon CORIXA, and PMC, its Affiliates and
Sublicensees shall be released from any liability or accountability with respect
to royalties for such year.

         5.3.     CONFIDENTIAL FINANCIAL INFORMATION.

                  CORIXA shall treat all financial information subject to review
under this Article 5 or under any sublicense agreement as Confidential
Information, and shall cause its accounting firm to retain all such financial
information in confidence.


ARTICLE 6 - PAYMENTS.  LATE PAYMENTS.

         6.1.     PAYMENT TERMS.

                  Royalties shown to have accrued by each royalty report
provided for under Article 5 of this Agreement shall be due on the date such
royalty report is due. Payment of royalties in whole or in part may be made in
advance of such due date. Past due payments shall accrue interest at a rate of
[***] per annum, unless occurring as a result of an Event of Force Majeure.

         6.2.     PAYMENT METHOD.

                  All payments by PMC to CORIXA under this Agreement shall be
paid in US dollars, and all such payments shall be made by bank wire transfer in
immediately available funds to the following bank account

           Account No.         [***]
                               ----------------------------------------




                                      -18-
<PAGE>   19

           Bank:               [***]
                               ----------------------------------------
           ABA Code            [***]
                               ----------------------------------------

         6.3.     EXCHANGE CONTROL.

                  If at any time legal restrictions prevent the prompt
remittance of part or all royalties with respect to any country in the Territory
where Product is sold, payment shall be made through such lawful means or method
as the Parties reasonably shall determine.

         6.4.     WITHHOLDING TAXES.

                  Except as otherwise provided below, all amounts owing from PMC
to CORIXA under this Agreement are gross amounts. PMC shall be entitled to
deduct the amount of any withholding taxes payable or required to be withheld by
PMC, its Affiliates or Sublicensees, to the extent PMC, its Affiliates or
Sublicensees pay to the appropriate governmental authority on behalf of CORIXA
such taxes. PMC shall use commercially reasonable efforts to minimize any such
taxes, levies or charges required to be withheld on behalf of CORIXA by PMC, its
Affiliates or Sublicensees. PMC promptly shall deliver to CORIXA proof of
payment of all such taxes, levies and other charges, together with copies of all
communications from or with such governmental authority with respect thereto.


ARTICLE 7 - RESEARCH PROGRAM.

         7.1.     OBJECT.

                  Pursuant to a mutually agreed upon research program which
shall be definitely established by the Research Committee referred to in Section
7.2. hereinafter on terms substantially in accordance with the draft research
program attached hereto as Exhibit 3 (the "Research Program"), and subject to
the condition precedent that PMC shall have exercised at least one (1) Option in
accordance with Section 2.2. hereof, CORIXA agrees to conduct research works
described therein and PMC agrees to support and fund such Research Program in
accordance with the terms and conditions set forth here below.

         7.2.     OVERSIGHT OF THE RESEARCH PROGRAM.

                  7.2.1.   Oversight.  The Research Program shall be overseen 
and monitored by the Research Committee as described herein (the "Committee").

                  7.2.2. Membership. Fifteen (15) days after the Operational
Date, CORIXA and PMC shall each appoint two (2) persons (or such other number of
persons as the Parties may determine) to serve on the Committee. Such
representatives shall be qualified, by reason of background and experience, to
assess the scientific progress of the Research Program. Each Party



                                      -19-
<PAGE>   20

shall have the right to change its representation on the Committee upon written
notice sent to the other.

                  7.2.3.   Co-Chair.  The Committee shall be co-chaired by one
representative of each Party.

                  7.2.4.   Responsibilities.  The Committee shall have 
authority to:

                           (i)      review and approve the draft Research 
Program prepared by CORIXA and establish the definitive Research Program;

                           (ii)     make recommendations regarding the
performance of the Research Program and the conduct of research works pursuant
thereto, and monitor performance thereunder;

                           (iii)    modify the Research Program as it 
determines, for each twelve (12) month period during the term thereof;

                           (iv)     review any and all proposed publication or 

communication relating to the Research Program and the results therefrom;

                           (v)      review any and all proposed filing of patent
application in connection with the Research Program.

                  7.2.5. Meetings. The Committee shall meet not less than two
(2) times a year during the term of the Research Program, at such dates and
times as agreed to by the Parties. Meetings in person shall normally take place
at CORIXA's premises or such other place as may be mutually agreed upon.
Meetings may be held by telecommunication means. At such meetings, the Committee
shall discuss the Research Program and the status of performance by CORIXA under
the Program, evaluate the results thereof and set priorities therefor. All
decisions made or actions taken by the Committee shall be made unanimously by
its members with the CORIXA members and PMC members having one vote each. The
Committee shall prepare written minutes of each meeting and a written record of
all decisions whether made at a formal meeting or not. Such minutes shall
incorporate semi-annual research reports prepared for the Parties by CORIXA. Any
disagreement among members of the Committee shall first be resolved within the
Committee with any resolution targeting the efficient achievement of the stated
objectives of the Research Program.

                           In the event that the Committee members maintain 
their disagreement, either Party may ask for resolution in accordance with
Section 19.3 hereof

         7.3.     THE PRINCIPAL INVESTIGATOR.

                  7.3.1. Principal Investigator. The Principal Investigator of
the Research Program shall be Dr. Steven Reed, an employee of CORIXA (the
"Principal Investigator"). CORIXA shall consult with PMC regarding any
replacement of the Principal Investigator, provided,




                                      -20-
<PAGE>   21

however, that CORIXA shall have the right to make, and shall make, the final
determination regarding any such replacement. The Principal Investigator shall
be at)pointed as a member of the Committee, and may be designated by CORIXA to
act on behalf of CORIXA as co-chair on such Committee.

                  7.3.2. Duties. The Principal Investigator shall direct the
Research Program and coordinate the efforts of other researchers involved in the
performance of such Program. The Principal Investigator shall sit with the
Committee as provided in Section 7.2. hereof, shall perform the duties set forth
hereunder and shall be afforded the opportunity to actively participate in all
Committee deliberations. The Principal Investigator shall provide reasonably
detailed status reports of the Research Program to the Committee at six-month
intervals, as well as at the earliest practicable time whenever, in the
Principal Investigator's judgment, an invention is created or reduced to
practice. The Principal Investigator shall devote such time and efforts as may
be required to fulfill his duties hereunder and to ensure the successful
administration and coordination of the Research Program.

         7.4.     CONDUCT OF RESEARCH PROGRAM.

                  The Research Program shall be conducted by CORIXA at CORIXA's
laboratories. CORIXA shall use all reasonable efforts to complete research works
in accordance with the said Program. Any research work performed by CORIXA
pursuant hereto shall be in compliance with current Good Laboratory Practices
(cGLP) as applicable in the United States of America.

         7.5.     FINANCIAL CONDITIONS.

                  7.5.1. Support Commitment. In consideration of the work
performed by CORIXA pursuant to and in accordance with the Research Program, PMC
shall pay to CORIXA a research fee of [***] (the "Commitment"). The Commitment
shall be inclusive of all costs incurred by CORIXA implementing the Research
Program.

                  7.5.2. Payments Schedule. Support payments shall be made by
PMC to CORIXA in four (4) quarterly payments of [***] in advance with the first
payment to be made within fifteen (15) days of the Operational Date, and the
other payments payable on the first day of each of the three (3) subsequent
Calendar Quarters, followed by four (4) other quarterly payments of [***]
payable on the first day of each of the following four (4) subsequent Calendar
Quarters.

                  7.5.3. No Conflict With Research Program. CORIXA agrees that
the Program funds provided by PMC shall be applied to the Research Program and
may not, without PMC prior written approval, be used in support of any other
research at CORIXA.





                                      -21-
<PAGE>   22

                  7.5.4. Title to Equipment. CORIXA shall retain title to any
equipment purchased with funds provided by PMC under this Agreement, if such
purchase is mutually agreed upon as part of the Research Program budget.

         7.6.     TERM OF THE RESEARCH PROGRAM.

   
                  7.6.1. The term of the Research Program shall be two (2) years
as from the fifteenth day after the Operational Date, unless terminated earlier
upon termination of this Agreement in accordance with Article 14 hereof.
    

         7.7.     CONFIDENTIALITY.  In order to facilitate the Research Program,
either Party may disclose confidential or proprietary information owned or
controlled by it to the other. It is hereby understood and agreed that such
information shall be deemed "Confidential Information" as defined in Article 8
and treated as such.

         7.8.     RESULTS OF THE RESEARCH PROGRAM.

                  7.8.1. All rights and title to the results of the Research
Program (the "Results"), whether patentable or not, which shall belong to
CORIXA, or jointly to CORIXA and PMC according to Section 9.1. hereof
(including but not limited to CORIXA Research Patents and Joint Research
Patents), shall be licensed to PMC subject to the terms and conditions of this
Agreement including, but not limited to, the limitation to the Fields of Use, at
no additional cost to PMC.

                  7.8.2. The Results shall be deemed Confidential Information
and shall not be disclosed by either Party to any Third-Party unless permitted
in accordance with Section 8 hereof Notwithstanding the foregoing, CORIXA shall
have the right to disclose Results to Third-Parties subject to confidentiality,
non-disclosure and restriction of use obligations with respect to such Results
as provided in Article 8 hereof, and without prejudice to the License granted to
PMC pursuant hereto, and provided further that such disclosure does not
jeopardize the ability of any Party to apply for patent in accordance with this
Agreement with respect to said Results.

                  7.8.3. All rights and titles to the Results, whether
patentable or not, including but not limited to, all PMC Inventions, Joint
Inventions and PMC Improvement, which shall belong to PMC, or jointly to PMC and
CORIXA in accordance with Section 9.1 hereof, shall be licensed by PMC to CORIXA
on a worldwide, non-exclusive basis for exploitation by CORIXA in any field of
use except the [***] Field of Use and the [***] Field of Use, subject to all
terms and conditions of this Agreement and without prejudice to the License
granted to PMC pursuant hereto. The financial conditions of such a license shall
be negotiated in good faith in a timely manner by the Parties, and shall not
include a right for CORIXA to grant sub-licenses to Third-Parties except with
the prior approval in writing of PMC.



                                      -22-
<PAGE>   23

ARTICLE 8 - CONFIDENTIALITY.

         8.1.     NON-DISCLOSURE OBLIGATIONS.

                  Except as otherwise provided in this Article 8, during the
term of this Agreement and for a period of ten (10) years thereafter, each Party
shall maintain in confidence, and use only for purposes as expressly authorized
and contemplated by this Agreement, all information and data supplied by the
other Party under this Agreement marked or otherwise identified as
"Confidential," including but not limited to Licensed Know-How, Results, and
Improvements. For purposes of this Article 8, information and data described
above shall be hereinafter referred to as "Confidential Information."

         8.2.     PERMITTED DISCLOSURES.

                  To the extent it is reasonably necessary or appropriate to
fulfill its obligations or exercise its rights under this Agreement, (a) a Party
may disclose Confidential Information it is otherwise obligated under this
Article 8 not to disclose, to its Affiliates, Sublicensees, consultants, outside
contractors and clinical investigators, on a need-to-know basis, provided that
such Persons agree to keep the Confidential Information confidential and not use
the Confidential Information for the same time period and to the same extent as
such Party is required; and

                  (b) a Party may disclose such Confidential Information to
government or other regulatory authorities to the extent that such disclosure is
required by applicable law, regulation or court order, or is reasonably
necessary to obtain patents, copyrights or authorizations to conduct clinical
trials with, and to commercially market Product, provided that the disclosing
Party shall provide written notice to the other Party and sufficient opportunity
to object to such disclosure or to request confidential treatment thereof. The
obligation not to disclose or use Confidential Information shall not apply to
any part of such Confidential Information (including Licensed Know-How) that (i)
is or becomes patented, published or otherwise part of the public domain or
publicly available other than by acts of the Party obligated not to disclose
such Confidential Information, or of its Affiliates or Sublicensees in
contravention of the Agreement; (ii) is disclosed to the receiving Party or its
Affiliates or Sublicensees by a Third Party, provided such Confidential
Information was not obtained by such Third-Party directly or indirectly from the
other Party under this Agreement on a confidential basis; (iii) prior to
disclosure under the Agreement, was already in the possession of the receiving
Party or its Affiliates or Sublicensees, provided such Confidential Information
was not obtained directly or indirectly from the other Party under the Agreement
as can be evidenced by the receiving Party by documentation, or (iv) is
disclosed in a press release agreed to by both Parties hereto, which agreement
shall not be unreasonably withheld.





                                      -23-
<PAGE>   24

         8.3.     TERMS OF THE AGREEMENT.

                  PMC and CORIXA shall not disclose any terms or conditions of
this Agreement to any Third-Party without the prior consent of the other Party,
except (a) to Persons with whom PMC or CORIXA has entered into or proposes to
enter into a business relationship, provided that such Persons shall enter into
the required confidentiality agreement, or (b) as required by applicable laws,
regulations or a court order, provided that the disclosing Party shall provide
written notice to the other Party and sufficient opportunity to object to such
disclosure or to request confidential treatment thereof.

         8.4.     PRESS RELEASES AND OTHER DISCLOSURES TO THIRD-PARTIES.

                  Neither CORIXA nor PMC will, without the prior written consent
of the other, issue any press release or make any other public announcement or
furnish any statement to any Person (other than either Parties' respective
Affiliates) concerning the existence of this Agreement and the transactions
contemplated by this Agreement, except for (i) general statement referring to
the existence of this Agreement, specifying the Fields of Use and identity of
the Parties but no other details,(ii) disclosures made in compliance with
sections 8.2. and 8.3. hereof, (iii) attorneys, consultants, and accountants
retained to represent them in connection with the transactions contemplated
hereby and (iv) occasional, brief comments by the respective officers of PMC and
CORIXA consistent with such guidelines for public statements as may be mutually
agreed by PMC and CORIXA made in connection with routine interviews with
analysts or members of the financial press.

                  In addition, either Party (after consultation with counsel) in
its own right may make such further announcements and disclosures, if any, as
may be required by applicable law, in which case the Party making the
announcement or disclosure will use its best efforts to give advance notice to,
and discuss such announcement or disclosure with, the other Party.

         8.5.     PUBLICATIONS.

                  Each Party shall have the right to publish or present the
Results and announce scientific progress of the Research Program, provided such
publication, presentation or announcement (and any revisions thereof, a
"Publication") is submitted to the other Party through the Committee at least
sixty (60) days prior to submitting it to any Third-Party (including any editing
person). The other Party shall have sixty (60) days after receipt of the draft
Publication to review and comment on such draft. Upon notice within such sixty
(60) day period by the other Party that such Party reasonably believes the
Publication would amount to the public disclosure of such Party's Confidential
Information and/or of a patentable invention upon which a patent application
should be filed prior to any such disclosure, submission of the concerned
Publication to Third-Parties shall be delayed for a ninety (90) day period from
the date of said notice, or for such longer period which may appear necessary
for appropriately deleting Confidential Information from the proposed
Publication and/or drafting and filing a patent application covering such
invention. In addition, each Party shall duty take into account comments made by
the other Party on any Publication and shall accept to have employees or others
acting on behalf 



                                      -24-
<PAGE>   25

of the other Party be mentioned as co-authors on any Publication describing
Results to which such persons will have contributed.


ARTICLE 9 - INVENTIONS AND PATENTS.

         9.1.     OWNERSHIP OF INVENTIONS.

                  The entire right and title to technology (including but not
limited to Improvements), whether or not patentable, and any patent applications
or patents based thereon, either resulting from the Research Program or which
relate to the Material, made, conceived or reduced to practice during the term
of this Agreement (a) by employees or others acting solely on behalf of CORIXA
or its Affiliates, shall be owned solely by CORIXA (including any CORIXA
Improvements and those CORIXA's patents and patent applications which fall under
the definition of Results, herein referred to as "CORIXA Research Patents"), (b)
by employees or others acting solely on behalf of PMC or its Affiliates, shall
be owned solely by PMC (a "PMC Invention"), and (c) jointly by employees or
others acting both on behalf of PMC and CORIXA, shall be jointly owned on an
equal basis by PMC and CORIXA (a "Joint Invention"). Each Party promptly shall
disclose to the other Party the making, conception or reduction to practice of
any such new technology by employees or others acting on behalf of such Party.

                  CORIXA and PMC each hereby represents that all employees and
other persons acting on its behalf in performing its obligations under this
Agreement shall be obligated under a binding written agreement to assign to it,
or as it shall direct, all Improvements conceived or reduced to practice by such
employees or other Persons.

         9.2.     PATENT PROSECUTION AND MAINTENANCE.

                  9.2.1 CORIXA shall be responsible at its sole expense for and
shall control the preparation, filing, prosecution, grant and maintenance of all
Licensed Patents (including CORIXA Research Patents) and all patents and patent
applications having as a subject matter an Improvement. CORIXA shall prepare,
file, prosecute and maintain such Licensed Patents in good faith consistent with
its customary patent policy and its reasonable business judgment, and shall
consider in good faith the interests of PMC in so doing.

                  9.2.2 Subject to Section 9.2.1, PMC shall be responsible for
and shall control the preparation, filing, prosecution, grant and maintenance,
of any patents and patent applications having as subject matter a Joint
Invention (the "Joint Research Patents"). PMC shall prepare, file, prosecute and
maintain such patent rights in good faith consistent with its customary patent
policy and its reasonable business judgment, and shall consider in good faith
the interests of CORIXA in so doing. PMC and CORIXA shall share all patent costs
in connection therewith on an equal basis.

                  9.2.3 Subject to Section 9.2.1, PMC shall be responsible at
its sole expense for and shall control the preparation, filing, prosecution,
grant and maintenance of any patents and patent applications having as subject
matter an invention which is part of Results and which 



                                      -25-
<PAGE>   26

ownership is attributed to PMC in accordance with Section 9.1 hereof (the "PMC
Research Patents"). PMC shall prepare, file, prosecute and maintain PMC Research
Patents in food faith consistent with its customary patent policy and its
reasonable business judgment, and shill consider in good faith the interests of
CORIXA in so doing.

                  9.2.4 The Parties shill at all times fully cooperate in order
to smoothly implement the foregoing provisions.

         9.3.     ENFORCEMENT OF LICENSED PATENTS.

                  CORIXA shall have the right, at its sole expense, to determine
the appropriate course of action to enforce the Licensed Patents or otherwise
abate the infringement thereof, to take (or refrain from taking) appropriate
action to enforce the Licensed Patents, to control any litigation or other
enforcement action and to enter into, or permit, the settlement of any such
litigation or other enforcement action with respect to the Licensed Patents, and
in good faith shall consider the interests of PMC in so doing.

                  All monies recovered upon the final judgment or settlement of
any such suit to enforce any Licensed Patents shall be retained by CORIXA.
Notwithstanding the foregoing, PMC and CORIXA shall fully cooperate with each
other in any action to enforce the Licensed Patents.

         9.4.     UNABATED INFRINGEMENT.

                  If there exists a substantial and continuing infringement of
the Licensed Patents in any country, and CORIXA has failed to take appropriate
action to abate such substantial and continuing infringement within sixty (60)
days after receipt of written notice from PMC thereof, then PMC shall have the
right to reduce by [***] the royalties payable to CORIXA under Sections 4. 1.
and 4.2. above in such country until such time as such substantial and
continuing infringement has been abated.


ARTICLE 10 - INFRINGEMENT ACTIONS BY THIRD-PARTIES.

         If PMC, CORIXA or their respective Affiliates, or PMC's Sublicensees,
is sued by a Third-Party for infringement of a Third-Party's patent because of
the manufacture, use or sale of Product or manufacture or use of Material, the
Party which has been sued shall promptly notify the other Party in writing of
the institution of such suit. CORIXA shall have the right, in its sole
discretion, to control the defense of such suit at its own expense, in which
event PMC shall have the right to be represented by advisory counsel of its own
selection, at its own expense, and shall cooperate fully in the defense of such
suit and furnish to CORIXA all evidence and assistance in its control. If CORIXA
does not elect within thirty (30) days after receipt of such notice to so
control the defense of such suit, PMC may undertake such control at its own
expense, and CORIXA shall then have the right to be represented by advisory
counsel of its own selection and at its own expense, and CORIXA shall cooperate
fully in the defense of such suit and furnish to PMC all evidence and assistance
in CORIXA's control. The Party controlling the suit may not 



                                      -26-
<PAGE>   27

settle the suit or otherwise consent to an adverse judgment in such suit that
diminishes the rights or interests of the non-controlling Party without the
express written consent of the non-controlling Party. Any judgments, awards,
settlements or damages payable with respect to legal proceedings covered by this
Article 10 shall be paid by the Party which controls the litigation.


ARTICLE 11 - NOTIFICATION OF PATENT TERM RESTORATION - PATENT EXTENSIONS.

         CORIXA shall notify PMC of (a) the issuance of each U.S. patent
included within the Licensed Patents, giving the date of issue and patent number
for each such patent, and (b) each notice pertaining to any patent included
within the Licensed Patents which it receives as patent owner pursuant to the
United Sates Drug Price Competition and Patent Term Restoration Act of 1984
(hereinafter called the "Act"), including notices pursuant to SectionSection101
and 103 of the Act from persons who have filed an abbreviated new drug
application ("ANDA").

         Such notices shall be given promptly, but in any event within five (5)
business days of each such patent's date of issue or receipt of each such notice
pursuant to the Act, whichever is applicable. CORIXA shall notify the other
Party of each filing for patent term restoration under the Act, any allegations
of failure to show due diligence and all awards of patent term restoration
(extensions) with respect to the Licensed Patents. Likewise, CORIXA or PMC, as
the case may be, shall inform the other Party of patent extensions and periods
of data exclusivity in the rest of the world regarding any Product and more
generally the Parties shall diligently cooperate with respect to any procedures
for patent and period of data exclusivity extensions, such as but not limited to
Supplementary Protection Certificates, the above mentioned Patent Term
Restoration and corresponding GATT regulations.

ARTICLE 12 - SUPPLY CONDITIONS.

         12.1. THE SUPPLY AGREEMENT. CORIXA has stated to PMC its current
intention to establish itself or to appoint a third party contractor as a
manufacturer of the Material. Provided CORIXA can reasonably demonstrate that it
shall be able to timely manufacture LeIF under current Good Manufacturing
Practice at reasonable cost in sufficient quantities, PMC shall purchase from
CORIXA PMC's requirements for LeIF for use in the manufacture of Products under
the terms and conditions of a supply agreement (the "Supply Agreement"), which
agreement shall be negotiated in good faith in a timely fashion by the Parties
hereto so as to become effective at least six months before PMC's expected First
Commercial Sale of Products. The Parties agree to negotiate in good faith in a
timely fashion the detailed terms and conditions of the Supply Agreement which
shall include at a minimum the following terms and conditions set forth in this
Article 12, as well as such other terms and conditions as may be agreed upon by
the Parties.

         12.2. LEIF REQUIREMENTS. The Supply Agreement shall provide that CORIXA
shall manufacture or have manufactured and PMC shall purchase from CORIXA, PMC's
entire requirements of LeIF (clinical lots as well as commercial lots) for
Products and that PMC shall 



                                      -27-
<PAGE>   28

purchase such LeIF for its own use in manufacturing Products only and shall not
be permitted to sell or re-sell LeIF to any Third-Party.

         12.3.    SPECIFICATIONS.  The Supply Agreement shall provide for 
(i) specifications that CORIXA shall be obligated to comply with; (11) quality
control criteria and procedures; and (iii) PMC's reasonable acceptance criteria
for the LeIF.

         12.4. FORECASTS AND ORDERS. The Supply Agreement shall provide for the
establishment of reasonable rolling forecasts and placement of orders which
shall take into account, among other factors, the seasonal nature of PMC's flu
vaccination campaigns and CORIXA's need to rationally plan its manufacturing of
LeIF consistent with its other manufacturing obligations.

         12.5. PRICE. The price of Material shall be negotiated in good faith by
the Parties and set forth in the Supply Agreement, but in no event shall such
price be for less than CORIXA's fully burdened cost of manufacturing (calculated
in accordance with Generally Accepted Accounting Practices in the USA) plus
[***].

         12.6. BACK-UP INVENTORIES. Pursuant to the Supply Agreement, CORIXA
shall agree to supply, and PMC shall agree to maintain inventory of LeIF in its
own facility sufficient to meet its needs for at least one complete, global
annual flu campaign, plus a reasonable quantity of Material for use in the other
Fields of Use.

         12.7. WARRANTIES. Pursuant to the Supply Agreement, CORIXA shall
warrant that (i) LeIF at the time of delivery shall meet the specifications
referred to in Article 12.3.; (ii) LeIF shall be manufactured in accordance with
the principles of current Good Manufacturing Practices (cGMP) in effect in the
country where it is manufactured or in compliance in all material respects with
the principles of the current Good Manufacturing Practices in effect in any
other country where Products are manufactured and/or sold (if more stringent
than cGMP first referred above) and any relevant establishment and product
licenses issued by any Agency. PMC shall inform CORIXA of the countries in which
Product is to be licensed to be sold and of any and all Agency(ies) responsible
in such countries. Upon request, PMC shall provide CORIXA with information
regarding the regulatory requirements in each such country; (iii) none of the
LeIF delivered to PMC shall be adulterated or misbranded within the meaning of
the United States Food, Drug and Cosmetics Act (the "Act"); (iv) none of the
LeIF is an article which may not, under the provisions of Article 404 or 505 of
the Act, be introduced into interstate commerce, and (v) the LeIF at the time of
delivery shall be pharmaceutically acceptable in terms of consistency and
validation. CORIXA SHALL DISCLAIM ANY OTHER WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.

         12.8. QUALITY AUDIT. Pursuant to the Supply Agreement, CORIXA shall
permit PMC, upon reasonable notice and at reasonable times, at PMC's expense, to
audit in cooperation with CORIXA's personnel production, packaging, quality
control and forwarding facilities of CORIXA and any of its significant suppliers
as they relate to CORIXA's manufacturing responsibilities under the Supply
Agreement.



                                      -28-
<PAGE>   29

         12.9.    ADVERSE EVENTS REPORTING.  Under the Supply Agreement, the 
Parties shall establish a procedure for monitoring and reporting adverse drug
experiences, consistent with Article 13 hereof

         12.10.   ASSURANCE OF SUPPLY.  Under the terms of the Supply Agreement,
PMC and CORIXA shall cooperate to anticipate PMC's reasonable long-term
requirements for LeIF, and CORIXA shall take reasonable measures to assure that
PMC's reasonable requirements can be met, which measures may include the
qualification of more than one manufacturing facility (including one such
facility to be operated by PMC or an Affiliate of PMC, in which case CORIXA
shall transfer Material manufacturing Know-how in accordance with Section 12.11
hereinafter) and/or maintenance of safety stocks of LeIF as provided for in
Article 12.6. hereof.

         12.11.   TRANSFER OF MANUFACTURING TECHNOLOGY.

                  Failure to Supply. Under the terms of the Supply Agreement,
upon CORIXA's first failure (the "First Failure", as defined below), CORIXA
shall complete the transfer of the manufacturing technology relating to the
Material by diligently rendering technical assistance to PMC so that PMC is able
to manufacture or have manufactured the LeIF, but only for use in the production
of Products. In such event, CORIXA shall promptly disclose to PMC, at any time
upon first request in writing by PMC, all information and current Know-How not
yet disclosed pursuant to this Agreement that is reasonably necessary for PMC to
manufacture or have manufactured LeIF. Such disclosure and supporting technical
assistance shall be made at PMC's costs and expenses, and CORIXA shall invoice
to PMC its reasonable out-of-pocket expenses as incurred in connection with such
transfer. There shall be no additional fees or payments (other than additional
royalties as provided for in accordance with Article 4 hereof) due to final
completion of the manufacturing technology transfer. After the first occasion
only of any such failure, the Parties agree that CORIXA shall have the right to
resume manufacture for PMC as the sole supplier of LeIF to PMC under the terms
and conditions of the Supply Agreement at such time as CORIXA demonstrates to
PMC's reasonable satisfaction that it can supply PMC's requirement for LeIF. For
the purpose of this Section 12.1 1, "First Failure" shall mean the first time
CORIXA fails to supply at least ninety percent (90%) of the amount of LeIF
being subject to a PMC's firm order placed by PMC with CORIXA pursuant to and in
accordance with the Supply Agreement.

         12.12.   OTHER TRANSFER EVENTS.  The completion of the transfer of the
manufacturing technology shall also be implemented in case of CORIXA's
bankruptcy or termination of the Supply Agreement for CORIXA's material breach
thereof in accordance with its terms.


ARTICLE 13 - ADVERSE EXPERIENCE REPORTING.

         During the term of the Agreement, each Party shall notify the other
immediately of any information (howsoever obtained and from whatever source)
concerning any unexpected side effect, injury, toxicity or sensitivity reaction,
or any unexpected incidence, and the severity thereof, associated with the
clinical uses, studies, investigations, tests and marketing of a Product or
Material. For purposes of this Article 13, "unexpected" shall mean (x) for a
nonmarketed 



                                      -29-
<PAGE>   30

Product, an experience that is not identified in nature, severity or
frequency in the current clinical investigator's confidential information
brochure, and (y) for a marketed Product, an experience which is not listed in
the current labeling for such Product, and includes an event that may be
symptomatically and pathophysiologically related to an event listed in the
labelling but differs from the event because of increased frequency or greater
severity or specificity. Each Party further shall immediately notify the other
of any information received regarding any threatened or pending action by an
agency which may affect the safety and efficacy claims of a Product. Upon
receipt of any such information, the Parties shall consult with each other in an
effort to arrive at a mutually acceptable procedure for taking appropriate
action; provided, however, that nothing contained herein shall be construed as
restricting either Party's right to make a timely report of such matter to any
government agency or take other action that it deems to be appropriate or
required by applicable law or regulation.


ARTICLE 14 - TERM AND TERMINATION.

         14.1.    AUTOMATIC TERMINATION.

                  Unless terminated earlier pursuant to this Article 14 or in
accordance with Article 16 hereof, the Agreement shall automatically terminate
effective February 1, 1997 unless on or before March 31, 1997 PMC exercises at
least one (1) Option under Section 2.2.4 hereof. Any termination of the Research
Program shall also terminate this Agreement as a whole.

         14.2.    EXPIRATION.

                  Unless terminated earlier pursuant to this Article 14, or in
accordance with Section 3.2.1 or Article 16 hereof, the Agreement shall expire
on the expiration of PMC's obligations to pay royalties hereunder.

         14.3.    TERMINATION BY PMC.

                  PMC shall have the right, at any time prior to the Operational
Date and after expiry of the Research Program term, in its sole discretion, to
terminate this Agreement as a whole, either forthwith upon written notice to
CORIXA if such notice is sent before the end of the Option Period, or by giving
not less than three (3) months prior written notice to CORIXA of such
termination, provided such notice is sent at the earliest three (3) months
before the end of the Research Program or at any time thereafter, and any such
termination shall not give rise to any indemnification or compensation
whatsoever.

         14.4.    DISCONTINUANCE OF DEVELOPMENT EFFORTS BY PMC.

                  PMC shall promptly give CORIXA notice in writing if PMC ceases
to authorize and/or expend financial resources towards satisfaction of its
obligations under this Agreement with respect to any particular Field of Use,
whereupon the License with respect to such Field of Use shall automatically
terminate, and such termination shall not give rise to any indemnification or
compensation whatsoever.





                                      -30-
<PAGE>   31

         14.5.    TERMINATION FOR CAUSE.

                  Either Party may terminate this Agreement for material breach
by the other Party (the "Breaching Party") of any material provision of the
Agreement, if the Breaching Party has not cured such breach within ninety (90)
days after written notice thereof; provided, however, that neither party shall
be deemed to be in material breach of this Agreement for purposes of a
termination hereunder during any period in which a good faith dispute between
the parties exists regarding performance of breach of its obligations hereunder,
and provided further, however, that in the event PMC fails to timely pay CORIXA
the royalty payments and milestone payments as set forth in Section 6.1 hereof
or the Option Exercise Fee(s) set forth in Section 2.2.4 hereof, PMC shall have
only fifteen (15) days to cure such material breach.

         14.6.    EFFECT OF EXPIRATION AND TERMINATION.

                  14.6.1 Expiration or termination of the Agreement shall not
relieve the Parties of any obligation accruing prior to such expiration or
termination. The provisions of Sections 3.2, 4.1, 4.3, 4.4, 7.7, 7.8, 14.6.2 and
14.6.3 and Articles 6, 8, 9, 10, 11, 15, and 19shall survive the expiration or
termination of the Agreement.

                  14.6.2 In the event of termination of this Agreement pursuant
to Section 14.5 due to PMC's uncured material breach of a material provision
hereof, PMC shall automatically grant CORIXA a royalty-free, perpetual,
worldwide, exclusive license to Joint Inventions, Joint Research Patents and PMC
Research Patents in the field of enhanced immunomodulation and to all Licensed
Know-How related thereto. Such license shall be effective upon termination of
this Agreement, and PMC shall then take all steps necessary to effectuate the
said license to CORIXA.

                  14.6.3 In the event of termination of this Agreement pursuant
to Section 14.5 due to CORIXA's uncured material breach of a material provision
hereof, CORIXA shall automatically grant PMC a royalty-free, perpetual,
worldwide, license to Joint Inventions, Joint Research Patents and CORIXA
Research Patents in the Fields of Use.


ARTICLE 15 - INDEMNITY.

         15.1.    DIRECT INDEMNITY.

                  15.1.1. Each Party shall indemnify and hold harmless, and
hereby forever releases and discharges the other Party from and against all
claims, demands, liabilities, damages and expenses, including attorneys' fees
and costs (collectively, the "Liabilities") arising out of the breach of any
material provision of this Agreement by the indemnifying Party, except to the
extent such Liabilities resulted from the gross negligence, recklessness or
willful misconduct of the other Party.

                  15.1.2. PMC shall indemnify and hold harmless, and hereby
forever releases and discharges CORIXA from and against all Liabilities suffered
or incurred arising out of any 



                                      -31-
<PAGE>   32

Third-Party claims for personal injury, death or disability or any product
recall to the extent caused by (a) any failure to test for or provide adequate
warnings of adverse side effects to the extent such failure arises out of acts
or omissions in connection with the preclinical or clinical testing of any
Product, (b) any manufacturing defect in any Product, or (c) any other act or
omission (without regard to culpable conduct) of PMC in connection with its
activities thereof contemplated by this Agreement; except in each case to the
extent such Liabilities resulted from the gross negligence, recklessness or
willful misconduct by CORIXA.

         15.2.    PROCEDURE.

                  A Party (the "Indemnitee") that intends to claim
indemnification under this Article 15 shall promptly notify the other Party (the
"Indemnitor") of any Liability or action in respect of which the Indemnitee
intends to claim such indemnification, and the Indemnitor shall have the right
to participate in, and, to the extent the Indemnitor so desires, jointly with
any other Indemnitor similarly noticed, to assume the defense thereof with
counsel selected by the Indemnitor; provided, however, that the Indemnitee shall
have the right to retain its own counsel, with the fees and expenses to be paid
by the Indemnitor, if representation of such Indemnitee by the counsel retained
by the Indemnitor would be inappropriate due to actual or potential differing
interests between such Indemnitee and any other Party represented by such
counsel in such proceedings. The indemnity obligations under this Article 15
shall not apply to amounts paid in settlement of any loss, claim, damage,
liability or action if such settlement is effected without the consent of the
Indemnitor, which consent shall not be withheld unreasonably. The Indemnitee,
its Affiliates, employees and agents, shall cooperate fully with the Indemnitor
and its legal representatives in the investigation of any action, claim or
liability covered by this indemnification.


ARTICLE 16 - FORCE MAJEURE.

         No Party (or any of its Affiliates) shall be held liable or responsible
to the other Party (or any of its Affiliates) nor be deemed to have defaulted
under or breached the Agreement for failure or delay in fulfilling or performing
any term of the Agreement when such failure or delay is caused by or results
from causes beyond the reasonable control of the affected Party (or any of its
Affiliates) including but not limited to fire, floods, embargoes, war, acts of
war (whether war be declared or not), insurrections, riots, civil commotions,
strikes, lockouts or other labor disturbances, acts of God or acts, omissions or
delays in acting by any governmental authority or the other Party (collectively,
"Events of Force Majeure"); provided, however, that the affected Party shall
exert all reasonable efforts to eliminate, cure or overcome any such Event of
Force Majeure and to resume performance of its covenants with all possible
speed; and provided, further, that nothing contained herein shall require any
Party to settle on terms unsatisfactory to such Party any strike, lockout or
other labor difficulty, any investigation or proceeding by any governmental
authority or any litigation by any Third-Party. Notwithstanding the foregoing,
to the extent that an Event of Force Majeure continues for a period in excess of
six (6) months, the affected Party shall promptly notify in writing the other
Party of such Event of Force Majeure and within four (4) months of the other
Party's receipt of such notice, the Parties agree to negotiate in good faith




                                      -32-
<PAGE>   33

either (i) to resolve the Event of Force Majeure, if possible, (ii) to extend by
mutual agreement the time period to resolve, eliminate, cure or overcome such
Event of Force Majeure, (iii) to amend this Agreement to the extent reasonably
possible, or (iv) to terminate this Agreement.


ARTICLE 17 - ASSIGNMENT.

         This Agreement may not be assigned or otherwise transferred, nor,
except as expressly provided hereunder, may any right or obligations hereunder
be assigned or transferred to any Third-Party by either Party without the
consent of the other Party; provided, however, that either Party may, without
such consent, assign this Agreement and its rights and obligations hereunder to
any of its Affiliates or in connection with the transfer or sale of all or
substantially all of its business, or in the event of its merger or
consolidation or change in control or similar transaction. Any permitted
assignee shall assume all obligations of its assignor under this Agreement.


ARTICLE 18 - SEVERABILITY.

         Each Party hereby agrees that it does not intend to violate any public
policy, statutory or common laws, rules, regulations, treaty or decision of any
government agency or executive body thereof of any country or community or
association of countries. Should one or more provisions of this Agreement be or
become invalid, the Parties hereto shall substitute, by mutual consent, valid
provisions for such invalid provisions which valid provisions in their economic
effect are sufficiently similar to the invalid provisions that it can be
reasonably assumed that the Parties would have entered into this Agreement with
such provisions.

         In case such provisions cannot be agreed upon, the invalidity of one or
several provisions of this Agreement shall not affect the validity of this
Agreement as a whole, unless the invalid provisions are of such essential
importance to this Agreement that it is to be reasonably assumed that the
Parties would not have entered into this Agreement without the invalid
provisions.


ARTICLE 19 - MISCELLANEOUS.

         19.1.    NOTICES.

                  Any consent, notice or report required or permitted to be
given or made under this Agreement by one of the Parties hereto to the other
shall be in writing, delivered personally or by facsimile (and promptly
confirmed by personal delivery, first class air mail or courier), first class
air mail or courier, postage prepaid (where applicable), addressed to such other
Party at its address indicated below, or to such other address as the addressee
shall have last furnished in writing to the address or in accordance with this
Section 19.1 and (except as otherwise provided in this Agreement) shall be
effective upon receipt by the addressee.

         If to CORIXA:

         CORIXA CORPORATION




                                      -33-
<PAGE>   34

         1124 Columbia Street, Suite 464
         Seattle, Washington WA 98104, USA
         Attention:  Chief Operating Officer
         With copy to Corporate Attorney

         If to PMC:

         PASTEUR MERIEUX Serums & Vaccins S.A.
         58, avenue Leclerc
         69007 Lyon, France
         Attention:  Corporate Vice-President, Secretary and General Counsel
                           Legal Department

         19.2.    APPLICABLE LAW.

                  The Agreement shall be governed by and construed in accordance
with the laws of the State of Washington, without regard to the conflict of law
principles thereof.

         19.3.    DISPUTE RESOLUTION.

                  The Parties agree that if any dispute or disagreement arises
between PMC on the one hand and CORIXA on the other in respect of this
Agreement, they shall follow the following procedure in an attempt to resolve
the dispute or disagreement.

                  (a) The Party claiming that such a dispute exists shall give
notice in writing ("Notice of Dispute") to the other Party of the nature of the
dispute;

                  (b) Within fourteen (14) business days of receipt of a Notice
of Dispute, a nominee or nominees of PMC and a nominee or nominees of CORIXA
shall meet in person and exchange written summaries reflecting, in reasonable
detail, the nature and extent of the dispute, and at this meeting they shall use
their reasonable endeavors to resolve the dispute;

                  (c) If, within a further period of fourteen (14) business
days, the dispute has not been resolved, the President of CORIXA and the
Directeur General or, if there is no Directeur General, the President Directeur
General, of PMC shall meet at a mutually agreed upon time and location for the
purpose of resolving such dispute;

                  (d) If, within a further period of thirty (30) business days,
the dispute has not been resolved or if, for any reason, the required meeting
has not been held, then the Parties agree that any dispute shall be referred to
an arbitrator appointed by agreement of CORIXA and PMC or, if no such agreement
is reached within thirty (30) business days after a Party commences the
arbitration, then by a panel of three arbitrators, with each of PMC and CORIXA
to select one arbitrator and those two arbitrators to select the third. If all
three arbitrators have not been selected within sixty (60) business days after a
Party commences the arbitration, then the Parties agree to abide by the
selection of the remaining arbitrator to be named by a representative of the
International Chamber of Commerce. The Parties agree that the Rules of the
International 



                                      -34-
<PAGE>   35

Chamber of Commerce shall govern such arbitration and that any decision of the
arbitrators shall be final and binding and shall be enforceable in any court of
competent jurisdiction worldwide (regardless of whether one of the Parties fails
or refuses to participate in the arbitration). The Parties agree that all
arbitrations shall be conducted in the English language and that the exclusive
venue of all arbitrations shall be in Zurich, Switzerland. The Party determined
by the arbitrators to be the Party substantially prevailing in the arbitration
shall be entitled to recover its legal and consultants' fees and other costs
reasonably incurred in connection with the arbitration (as determined by the
arbitrators) and

                  (e) in the event of a dispute regarding any payments owing
under this Agreement, all undisputed amounts shall be paid promptly when due and
the balance, if any, promptly after resolution of the dispute.

         19.4.    ENTIRE AGREEMENT.

                  This Agreement contains the entire understanding of the
Parties with respect to the subject matter hereof. All express or implied
agreements and understandings, either oral or written, heretofore made are
expressly superseded by this Agreement. This Agreement may be amended, or any
term hereof modified, only by a written instrument duly executed by both Parties
hereto.

         19.5.    INDEPENDENT CONTRACTORS.

                  CORIXA and PMC each acknowledge that they shall be independent
contractors and that the relationship between the two Parties shall not
constitute a partnership, joint venture or agency. Neither CORIXA nor PMC shall
have the authority to make any statements, representations or commitments of any
kind, or to take any action, which shall be binding on the other Party, without
the prior consent of the other Party to do so.

         19.6.    AFFILIATES.

                  Each Party shall cause its respective Affiliates to comply
fully with the provisions of this Agreement to the extent such provisions
specifically relate to, or are intended to specifically relate to, such
Affiliates, as though such Affiliates were expressly named as joint obligors
hereunder.

         19.7.    WAIVER.

                  The waiver by either Party hereto of any right hereunder or
the failure to perform or of a breach by the other Party shall not be deemed a
waiver of any other right hereunder or of any other breach or failure by said
other Party whether of a similar nature or otherwise.

         19.8.    COUNTERPART.

                  This Agreement may be executed in two or more counterparts,
each of which shall be deemed an original, but all of which together shall
constitute one and the same instrument.



                                      -35-
<PAGE>   36

         IN WITNESS WHEREOF, the Parties have executed this Agreement as of the
date first set forth above.



For CORIXA CORPORATION
Date:   December 23, 1996
Place:  Seattle



By:  /s/  Mark McDade
   ---------------------------------
Name:
Title :



PASTEUR MERIEUX SERUMS & VACCINS S.A.
Date:  December 23, 1996
Place:  Lyon



By:  /s/  Jean-Jacques Bertrand
    -------------------------------
Name:  Jean-Jacques BERTRAND
Title:  Chairman, President and Chief Executive Officer



                                      -36-
<PAGE>   37

                                   SCHEDULE A

                           Existing Licensed Patents
<PAGE>   38

PCT App. No. [***], filed [***], entitled, [***].

U.S. Pat. App. No. [***], filed [***], entitled, [***].

U.S. Pat. App. No. [***], filed [***], entitled, [***].

U.S. Pat. App. No. [***], filed [***], entitled, [***].

U.S. Pat. App. No. [***], filed [***], entitled, [***].

PCT App. No. [***], filed [***], entitled, [***].
<PAGE>   39

                                   SCHEDULE B

                           AUTHORIZED PMC AFFILIATES

1.      Connaught Laboratories, Limited, Willowdale, Ontario, Canada

2.      Connaught Laboratories, Inc., Swiftwater, Pennsylvania, USA

3.      Virogenetics Corporation, Troy, New York, USA
<PAGE>   40
                                   SCHEDULE C

                                     [***]


<PAGE>   41
                                   Exhibit 1
                      Special Material Transfer Agreement

        Pasteur Merieux Connaught Group ("PMC") desires to receive from Corixa
Corporation ("Corixa") certain Biological Materials. These Biological Materials
are considered by Corixa to be highly valuable, confidential and proprietary
products of Corixa research. Accordingly, Corixa and PMC, intending to be
legally bound by the following terms and conditions, agree that:

        1.      Definitions. "Biological Materials" means all materials related
to LeIF transferred by Corixa to PMC hereunder, any replicates, progeny and
derivatives of the Biological Materials, and any mixtures or combinations of
Biological Materials and other substances. "Proposed Use" shall mean the
evaluation of the Biological Materials for determining interest in further
development and commercialization by Chiron.

        2.      Title to Biological Materials. Corixa shall retain all title
and interest in and to the Biological Materials. PMC shall not imply or
represent to any person that it is the owner of the Biological Materials.

        3.      Delivery of Biological Materials. Corixa shall deliver the
Biological Materials from time to time, as discussed between PMC and Corixa in
advance, provided the requested amounts are considered fair and reasonable.

        4.      Use of Biological Materials. As of the date of this Agreement,
Corixa grants to PMC a non-exclusive license to use the Biological Materials
for the Proposed Use for research purposes and not for any commercial use. PMC
shall not use the Biological Materials in humans or in contact with any cells
or other materials to be infused into humans. PMC shall use the Biological
Materials in compliance with all applicable federal, state and local laws and
regulations. PMC shall not transfer the Biological Materials or any information
related to those materials to any person who is not under the immediate and
direct supervision of PMC, nor use the Biological Materials in research that is
subject to consulting or licensing obligations to another corporation or
government agency. No other license shall be granted or implied.

        5.      Reports: Publicity. As often as mutually agreed between PMC and
Corixa but at least once per month, PMC shall provide a written report
summarizing the results of the Proposed Use of the Biological Materials. No
publication of results by PMC may be made unless it is with the express,
written permission of Corixa. Neither party shall disclose the existence of
this Agreement to any third party or use the name of the other party in any
publicity or advertising without prior written approval of the other party.

        6.      Inventions. All rights and title to patents or patent
applications of or related to the Biological Materials are exclusively
Corixa's. In the event that use of the Biological Materials results in an
invention or discovery involving a new use, improvement or enhancement of the
Biological Materials, whether patentable or not ("Invention"), PMC shall
disclose the Invention to Corixa. PMC shall cooperate with Corixa in seeking
patent coverage for the Invention and in 
<PAGE>   42
assigning all right and title to the Invention to Corixa. Corixa shall be
responsible for all costs of obtaining patent coverage.

        7.      No Conflicts. Both parties warrant and represent that they have
the right to enter into this Agreement and that the terms of this Agreement are
not inconsistent with other contractual obligations they may have or with the
policies of any institution with which they are associated.

        8.      Disclaimer. THE BIOLOGICAL MATERIALS ARE PROVIDED TO PMC
WITHOUT WARRANTY OF MERCHANTABILITY OF FITNESS FOR A PARTICULAR PURPOSE OR ANY
OTHER WARRANTY, EXPRESS OR IMPLIED. CORIXA SHALL NOT BE LIABLE FOR ANY USE OF
THE BIOLOGICAL MATERIALS BY PMC, OR FOR ANY LOSS, CLAIM, DAMAGE OR LIABILITY,
OF ANY KIND OR NATURE, WHICH MAY ARISE FROM OR IN CONNECTION WITH THIS
AGREEMENT OR FROM THE USE, HANDLING OR STORAGE OF THE BIOLOGICAL MATERIALS. No
indemnification for any loss, claim, damage or liability is intended or shall
be provided by any party under this Agreement.

        9.      Term and Termination. This Agreement shall be effective as of
15 February, 1996 and shall terminate nine (9) months thereafter. This
Agreement may be terminated earlier at any time by either party upon ten (10)
days' written notice. All unused Biological materials shall be returned to
Corixa or destroyed, at the sole option of Corixa, within ten (10) days
following termination of this Agreement. Termination shall not affect any
rights of any party under paragraphs 5, 6 or 8 above.

        10.     Assignability. The rights and obligations of the investigator
and the institution under this Agreement shall not be assignable without the
prior written consent of Corixa.

        11.     Applicable Law. This Agreement and the rights of the parties
shall be determined in accordance with the laws of the State of Washington. In
the event of actual or threatened disclosure or transfer of the Biological
Materials by PMC to a third party without the prior written consent of Corixa,
Corixa is likely to suffer irreparable harm, and shall be entitled to specific
performance of the obligations of PMC under this Agreement, without bond, as
well as all necessary injunctive relief against unauthorized disclosure or
transfer.

        12.     Amendments; Other. No modification of this Agreement shall be
effective unless the modification is in writing and executed by both parties.
This Agreement is to be executed in duplicate. One fully executed copy is to be
retained by PMC in care of ___________________________________________________.
The second fully executed copy is to be retained by Corixa at 1124 Columbia
St., Ste. 464, Seattle, WA 98104.

        13.     Entire Understanding. This Agreement, including the Research
Proposal attached as an appendix, constitutes the entire understanding of the
parties hereto with respect to the matters herein contained.


                                      -2-
<PAGE>   43
        The signatures of the authorized officers of each party are required
below to make the Agreement effective.

CORIXA CORPORATION                      PMC



- ------------------------                ------------------------
Mark McDade                             Name: __________________
Chief Operating Officer                 Title:__________________

Date:____________, 1996                 Date:____________, 1996



                                      -3-
<PAGE>   44
                                   EXHIBIT 2

                                EVALUATION PLANS

<PAGE>   45
                              LeiF Evaluation Plan

<TABLE>
<CAPTION>

        TARGETS         TO BE EVALUATED         DURATION OF EVALUATION
    --------------      ---------------         ----------------------
<S>                    <C>                      <C>
    Flu                      [***]                      [***]
                             [***]                      [***]

    AIDS                     [***]                      [***]
                             [***]                      [***]

    Malaria                  [***]                      [***]
                             [***]                      [***]

    RSV                      [***]                      [***]
                             [***]                      [***]

    Tuberculosis             [***]                      [***]
</TABLE>
<PAGE>   46


                                   EXHIBIT 3

                                RESEARCH PROGRAM


                            [intentionally omitted]

<PAGE>   1
                                                                   EXHIBIT 10.22


                              AMENDED AND RESTATED

                              LICENSE AND RESEARCH

                             COLLABORATION AGREEMENT

                                     BETWEEN

                               CORIXA CORPORATION

                                       AND

                                 GENQUEST, INC.

                                December 23, 1996


<PAGE>   2
<TABLE>
<S>      <C>                                                            <C>
AMENDED AND RESTATED LICENSE AND RESEARCH
         COLLABORATION AGREEMENT ........................................1
                                                                         
RECITALS ................................................................1
                                                                         
ARTICLE 1 - DEFINITIONS .................................................1
   1.1   Affiliate ......................................................1
   1.2   Annual Management Plan .........................................2
   1.3   Call Option Agreement ..........................................2
   1.4   Co-Exclusive Field .............................................2
   1.5   Control ........................................................2
   1.6   Corixa Exclusive Field .........................................2
   1.7   Corixa Gene Discovery Know-how .................................2
   1.8   Corixa Gene Discovery Methodologies . ....... ...... ...........2
   1.9   Corixa Gene Product ............................................2
   1.10  Corixa Gene Product Know-how ...................................3
   1.11  Corixa Gene Product Patent .....................................3
   1.12  Corixa Know-how ................................................3
   1.13  Corixa Net Sales ...............................................3
   1.14  Corixa Option ..................................................3
   1.15  Corixa Research Patents ........................................3
   1.16  Corixa Technology ..............................................3
   1.17  Effective Date .................................................3
   1.18  Existing Corixa Know-how .......................................3
   1.19  Existing Corixa Patents ........................................4
   1.20  Existing Corixa Technology .....................................4
   1.21  Existing Third Party Agreements ................................4
   1.22  FDA ............................................................4
   1.23  Field ..........................................................4
   1.24  Fisher Methodology .............................................4
   1.25  Gene Product ...................................................4
   1.26  GenQuest Exclusive Field .......................................4
   1.27  GenQuest Gene Discovery Methodologies ..........................4
   1.28  GenQuest Gene Product ..........................................4
   1.29  GenQuest Gene Product Know-how .................................5
   1.30  GenQuest Gene Product Patent ...................................5
   1.31  GenQuest Know-how ..............................................5
   1.32  GenQuest Net Sales .............................................5
   1.33  GenQuest Option ................................................5
   1.34  GenQuest Patents ...............................................5
   1.35  GenQuest Technology ............................................6
   1.36  Identified .....................................................6
   1.37  IND ............................................................6
   1.38  Information ....................................................6
   1.39  Joint Patent ...................................................6
</TABLE>
                                                                     

                                      -i-
<PAGE>   3
<TABLE>
<S>      <C>                                                            <C>
   1.40  Material Breach ................................................6
   1.41  Net Sales ......................................................6
   1.42  Patent .........................................................6
   1.43  Patent Costs ...................................................7
   1.44  Product ........................................................7
   1.46  Regulatory Exclusivity .........................................7
   1.47  Research Services Costs ........................................7
   1.48  Research .......................................................7
   1.49  Research Management Committee ..................................7
   1.50  Research Plan ..................................................7
   1.51  Research Term ..................................................7
   1.52  [***] ..........................................................8
   1.53  Secret .........................................................8
   1.54  Substantial ....................................................8
   1.55  Territory ......................................................8
   1.56  Third Party ....................................................8
   1.57  Vaccine ........................................................8
                                                                         
ARTICLE 2 - RESEARCH MANAGEMENT COMMITTEE ...............................8
   2.1 Research Management Committee ....................................8
   2.2 Responsibilities of Research Management Committee ................9
   2.3 Board Oversight of Plans; Annual Management Plan;                 
       Responsibility for Administrative Services .......................9
                                                                         
ARTICLE 3 - RESEARCH ....................................................10
   3.1 Collaborative Research ...........................................10
   3.2 Research Efforts and Expenses ....................................10
                                                                         
ARTICLE 4 - LICENSES ....................................................11
   4.1 License to Corixa; Limitation on Sublicense ......................11
   4.2 Licenses to GenQuest; Limitation on Sublicense ...................12
   4.3 Assignment or Sublicense to Affiliates ...........................13
   4.4 Existing Third Party Technology ..................................13
   4.5 Additional Technology ............................................14
   4.6 Internal Corixa Gene Discovery Research ..........................14
   4.7 Limitations ......................................................14
                                                                         
ARTICLE 5 - TRADEMARKS ..................................................14
   5.1 Trademarks .......................................................14
                                                                         
ARTICLE 6 - CORIXA ROYALTIES ............................................15
   6.1 Royalties ........................................................15
   6.2 Third Party Agreements ...........................................16
   6.3 Reporting and Payment of Royalties ...............................16
   6.4 Samples or Donations to Third Parties ............................16
</TABLE>


                                      -ii-
<PAGE>   4
<TABLE>
<S>      <C>                                                            <C>
ARTICLE 7 - GENQUEST ROYALTIES ..........................................16
   7.1 Royalties ........................................................16
   7.2 Third Party Agreements ...........................................16
   7.3 Reporting and Payment of Royalties ...............................16
   7.4 Samples or Donations to Third Parties ............................17
                                                                         
ARTICLE 8 - PAYMENTS; OTHER CONSIDERATION ...............................17
   8.1 FTE Reimbursement ................................................17
   8.2 Other Expenses ...................................................17
   8.3 Payment ..........................................................17
                                                                         
ARTICLE 9 - EQUITY ......................................................17
                                                                         
ARTICLE 10 - CONFIDENTIALITY ............................................17
  10.1 Confidentiality; Exceptions ......................................17
  10.2 Authorized Disclosure ............................................18
  10.3 Confidentiality Agreements with Employees ........................18
                                                                     
ARTICLE 11 - OWNERSHIP OF INTELLECTUAL PROPERTY AND
             PATENT RIGHTS ..............................................18
  11.1 Non-Gene Product Inventions Resulting from the Research ..........19
  11.2 Gene Product Inventions Resulting from the Research ..............19
  11.3 Grants to GenQuest ...............................................20
  11.4 GenQuest Responsibility for Patent Filings .......................20
  11.5 Back-Up Rights ...................................................21
  11.6 Enforcement and Defense Rights ...................................21
  11.7 Patent Costs .....................................................22
  11.8 Infringement of Third Party Patents ..............................22
                                                                         
ARTICLE 12 - REPRESENTATIONS, WARRANTIES AND COVENANTS ..................22
  12.1 Representations, Warranties and Covenants of Both Parties.........22
  12.2 Representations, Warranties and Covenants of GenQuest ............22
  12.3 Representations, Warranties and Covenants of Corixa ..............24
                                                                         
ARTICLE 13 - REPORTS, RECORDS AND PAYMENTS ..............................26
  13.1 Sharing of Information ...........................................26
  13.2 Record of Net Sales ..............................................26
  13.3 Records of Research Expenditures .................................26
  13.4 Publicity Review .................................................26
  13.5 Publications .....................................................27
                                                                         
ARTICLE 14 - TERM AND TERMINATION; CERTAIN OPTION RIGHTS ................27
   14.1 Term ............................................................27
   14.2 Termination for Material Breach .................................27
   14.3 Termination for Bankruptcy ......................................28
   14.4 Termination by GenQuest .........................................29
</TABLE>


                                      -iii-
<PAGE>   5
<TABLE>
<S>      <C>                                                            <C>
   14.5 Termination by Corixa ...........................................29
   14.6 Surviving Rights ................................................29
   14.7 Accrued Rights, Surviving Obligations ...........................29
   14.8 Certain Option Rights ...........................................30
                                                                         
ARTICLE 15 - INDEMNIFICATION AND LIMITATIONS; DISPUTE RESOLUTION ........30
   15.1 Indemnification by Corixa .......................................30
   15.2 Indemnification by GenQuest .....................................30
   15.3 Limited Liability ...............................................30
   15.4 Warranty Disclaimer .............................................31
   15.5 Dispute Resolution ..............................................31
                                                                         
ARTICLE 16 - MISCELLANEOUS ..............................................33
   16.1 Assignment to Non-Affiliates: Sale or Merger ....................33
   16.2 Force Majeure ...................................................33
   16.3 Further Actions .................................................33
   16.4 No Trademark Rights .............................................33
   16.5 Notices .........................................................33
   16.6 Governing Law ...................................................34
   16.7 Waiver ..........................................................35
   16.8 Severability ....................................................35
   16.9 Entire Agreement ................................................35
   16.10Certain Legal Fees ..............................................35
   16.11Waiver of Conflicts .............................................35
</TABLE>

<TABLE>
<CAPTION>
EXHIBITS
- --------
<S>               <C>
Exhibit A         Call Option Agreement
Exhibit 1.19      Existing Corixa Patents
Exhibit 1.9       Exclusions from "Corixa Gene Product"
Exhibit 1.24      Fisher Methodology
Exhibit 3.1       Research Plan
Exhibit 4.4(a)    Corixa Third Party Agreements
Exhibit 4.4(b)    GenQuest Third Party Licenses with respect to the Fisher
                  Methodology
Exhibit 12.2(g)   GenQuest Gene Products

SCHEDULES
Schedule 3.2      Payments for Research Services
Schedule 12.2     GenQuest Schedule of Exceptions
Schedule 12.3     Corixa Schedule of Exceptions
</TABLE>


                                      -iv-
<PAGE>   6
                    AMENDED AND RESTATED LICENSE AND RESEARCH
                             COLLABORATION AGREEMENT


               THIS AMENDED AND RESTATED LICENSE AND RESEARCH COLLABORATION
AGREEMENT (this "Agreement") is dated as of the 23rd day of December, 1996 (the
"Execution Date") by and between GenQuest, Inc., a Delaware corporation having
its principal place of business at 1124 Columbia Street, Suite 464, Seattle,
Washington 98104 ("GenQuest") and Corixa Corporation, a Delaware corporation
having its principal place of business at 1124 Columbia Street, Suite 464,
Seattle, Washington 98104 ("Corixa").

                                    RECITALS

        A. Corixa and GenQuest are parties to that certain License and Research
Collaboration Agreement dated February 2, 1996 (the "Prior Collaboration
Agreement") pursuant to which Corixa and GenQuest agreed to collaborate in the
discovery and characterization of novel genes through functional assays for
treatment of cancer or pre-neoplastic cell proliferation diseases in humans and
animals, with a view to developing technology and/or possible products for use
and/or sale by the parties.

        B. Under the Prior Collaboration Agreement, Corixa obtained rights to
use certain GenQuest proprietary technology to research and develop Vaccine
products for the treatment of cancer and GenQuest obtained rights to use certain
proprietary Corixa technology to research and develop non-Vaccine products for
the treatment and diagnosis of cancer. Corixa and GenQuest also cross licensed
certain inventions and/or discoveries to each other pursuant to the Prior
Collaboration Agreement.

        C. Corixa and GenQuest each desire to continue such collaboration on
modified terms and conditions, and in connection therewith, Corixa and GenQuest
each desire to terminate the Prior Collaboration Agreement in its entirety and
accept the rights and obligations created pursuant hereto in lieu of the rights
and obligations created under the Prior Collaboration Agreement.

        NOW, THEREFORE, in consideration of the mutual covenants and promises
herein contained, the parties hereto agree as follows:

                                    ARTICLE 1
                                   DEFINITIONS

        The following terms shall have the following meanings as used in this
Agreement:

        1.1 "Affiliate" means an entity that, directly or indirectly, through
one or more intermediaries, controls, is controlled by or is under common
control with GenQuest or Corixa. For the purposes of this definition, control
means the direct or indirect ownership of (a) at least fifty percent (50%) or,
if less than fifty percent (50%), the maximum percentage as allowed by
applicable law, of the outstanding voting securities of such entity or (b) at
least fifty percent (50%) of the decision making authority of such entity; 
provided, however, that neither Corixa nor GenQuest shall be deemed to be an 
Affiliate of the other for purposes of this Agreement.




<PAGE>   7
        1.2 "Annual Management Plan" has the meaning assigned to it in Section
2.3 of the Agreement.

        1.3 "Call Option Agreement" means the Call Option Agreement dated as of
the date hereof by and among GenQuest, Corixa and the investors in GenQuest
listed on Exhibit A thereto (the "Call Option Agreement").

        1.4 "Co-Exclusive Field" means the treatment, prevention or diagnosis of
diseases in humans, which diseases are not included in the GenQuest Exclusive
Field or the Corixa Exclusive Field.

        1.5 "Control" means possession of the ability to grant a license or
sublicense as provided for herein, without violating the terms of the license or
other acquisition agreement, if any, pursuant to which a party hereto (or its
Affiliates) acquired such subject matter.

        1.6 "Corixa Exclusive Field" means the treatment of disease (including
but not limited to cancer and/or pre-neoplastic cell proliferation disease
and/or infectious disease) in humans or animals through (a) the use of a Vaccine
or (b) the use of ex vivo hematopoeitic cell therapy for adoptive immunotherapy.

        1.7 "Corixa Gene Discovery Know-how" means Information necessary or
useful to practice any Corixa Gene Discovery Methodology that is within the
Control of Corixa and is required to be disclosed to GenQuest pursuant to
Section 13.1 of this Agreement.

        1.8 "Corixa Gene Discovery Methodologies" shall mean all gene discovery
methodologies invented or discovered by Corixa or its Affiliates during the
Research Term or in-licensed by Corixa or its Affiliates during the Research
Term, in each case to the extent the same is Controlled by Corixa.

        1.9 "Corixa Gene Product" means [***], which in each case are Controlled
by Corixa or its Affiliates at any time until the date that is one (1) year
after termination of the Research Term, including such inventions or discoveries
made prior to the Effective Date (but excluding those items listed in Exhibit
1.9). Corixa Gene Product shall in no event be deemed to include any Corixa Gene
Discovery Methodology.

        1.10 "Corixa Gene Product Know-how" means Information necessary or
useful to practice Corixa Gene Products which (i) Corixa is required to disclose
to GenQuest pursuant to the terms of Section 13.1 of this Agreement, and (ii) is
within the Control of Corixa.

        1.11 "Corixa Gene Product Patent" means any Patent that comes into the
Control of Corixa or its Affiliates with claims covering a Corixa Gene Product.



                                      -2-

<PAGE>   8
        1.12 "Corixa Know-how" means Information which (i) Corixa is required to
disclose to GenQuest pursuant to the terms of Section 13.1 of this Agreement and
(ii) during the Research Term is within the Control of Corixa.

        1.13 "Corixa Net Sales" means the amount actually received by Corixa or
an Affiliate, assignee or sublicensee of Corixa or a distributor, reseller or
other entity in the distribution chain in connection with sales of Products or
GenQuest Gene Products under this Agreement (other than GenQuest or its
Affiliates) to a Third Party which intends to use and not resell the Product or
GenQuest Gene Products, less the following, to the extent the same are credited
or deducted by the buyer as a reduction of the invoiced amount: (i) discounts,
including cash discounts, or rebates, retroactive price reductions or allowances
actually allowed or granted from the billed amount, (ii) credits or allowances
actually granted upon claims, rejections or returns of Products or GenQuest Gene
Products, including recalls, regardless of the party requesting such, (iii)
freight, postage, shipping and insurance charges paid for delivery of any
Product or GenQuest Gene Product, to the extent billed, and (iv) taxes, duties
or other governmental charges levied on or measured by the billing amount when
included in billing, as adjusted for rebates and refunds; provided however, that
Corixa Net Sales shall in no event include any amounts paid to Corixa by
GenQuest as royalties under this Agreement or pursuant to Section 8 hereof. As
used herein, "Products" and GenQuest Gene Products include products that
incorporate Products or GenQuest Gene Products.

        1.14 "Corixa Option" has the meaning assigned to it in Section 14.8(a)
of this Agreement.

        1.15 "Corixa Research Patents" means any Patent that comes into the
Control of Corixa or its Affiliates with claims covering an invention or
discovery other than a Corixa Gene Product made by Corixa during the Research;
excluding, however, Joint Patents.

        1.16 "Corixa Technology" means the Corixa Know-how and Corixa Research
Patents, collectively.

        1.17 "Effective Date" means January 1, 1996.

        1.18 "Existing Corixa Know-how" means Information necessary or useful to
practice Existing Corixa Patents that (i) is within the Control of Corixa as of
the Effective Date or (ii) comes into the Control of Corixa during the Research
Term.

        1.19 "Existing Corixa Patents" means the patent applications and issued
patent and invention disclosures (which are subsequently covered by patent
applications and/or issued patents) set forth on Exhibit 1.19 hereto together
with all divisionals, continuations, continuations-in-part, foreign counterparts
thereof, all patents issuing on any of the foregoing and all registrations,
re-issues, re-examinations and renewals thereof.

        1.20 "Existing Corixa Technology" means the Existing Corixa Know-how and
the Existing Corixa Patents, collectively.



                                      -3-

<PAGE>   9
        1.21 "Existing Third Party Agreements" has the meaning assigned to it in
Section 4.4 of this Agreement.

        1.22 "FDA" has the meaning assigned to it in Section 4.1(c) of this
Agreement.

        1.23 "Field" means the treatment, prevention or diagnosis of cancer or
pre-neoplastic cell proliferation disease in humans or animals. [***].

        1.24 "Fisher Methodology" means the methodology for the discovery of
genes that is the subject of the issued patents and/or patent applications set
forth on Exhibit 1.24 and any additional patents and/or patent applications
required to be disclosed by GenQuest to Corixa pursuant to Section 12.2(g) of
this Agreement, and all divisionals, continuations, continuations-in-part,
foreign counterparts thereof, all patents issuing on any of the foregoing and
all registrations, reissue, re-examination or renewal thereof.

        1.25 "Gene Product" means the Corixa Gene Products and the GenQuest Gene
Products, collectively.

        1.26 "GenQuest Exclusive Field" means that portion of the Field that is
not included within the Corixa Exclusive Field.

        1.27 "GenQuest Gene Discovery Methodologies" means (i) the Fisher
Methodology and (ii) all other gene discovery methodologies invented or
discovered by GenQuest during the Research Term or in-licensed by GenQuest
pursuant to Section 4.5 during the Research Term, in each case to the extent the
same is Controlled by GenQuest.

        1.28 "GenQuest Gene Product" means [***] which in each case are
Controlled by GenQuest or its Affiliates at any time until the date that is one
(1) year after termination of the Research Term, including all such inventions
or discoveries made prior to the Effective Date. GenQuest Gene Product shall in
no event be deemed to include any GenQuest Gene Discovery Methodology.

        1.29 "GenQuest Gene Product Know-how" means Information necessary or
useful to practice GenQuest Gene Products which (i) (a) is in existence as of
the Effective Date or (b) GenQuest is required to disclose to Corixa pursuant to
the terms of Section 13.1 of this Agreement and (ii) is within the Control of
GenQuest.

        1.30 "GenQuest Gene Product Patent" means any Patent that comes into the
Control of GenQuest or its Affiliates with claims covering a GenQuest Gene
Product.



                                      -4-

<PAGE>   10
        1.31 "GenQuest Know-how" means Information necessary or useful to
practice any GenQuest Gene Discovery Methodology that is (i) in the Control of
GenQuest as of the Effective Date or (ii) is required to be disclosed to Corixa
pursuant to Sections 12.3 or 13.1 of this Agreement.

        1.32 "GenQuest Net Sales" means the amount actually received by GenQuest
or an Affiliate, assignee or sublicensee of GenQuest or a distributor, reseller
or other entity in the distribution chain in connection with sales of Corixa
Gene Products under this Agreement (other than Corixa or its Affiliates) to a
Third Party which intends to use and not resell the Corixa Gene Product, less
the following, to the extent the same are credited or deducted by the buyer as a
reduction of the invoiced amount: (i) discounts, including cash discounts, or
rebates, retroactive price reductions or allowances actually allowed or granted
from the billed amount, (ii) credits or allowances actually granted upon claims,
rejections or returns of Corixa Gene Products, including recalls, regardless of
the party requesting such, (iii) freight, postage, shipping and insurance
charges paid for delivery of any Corixa Gene Product, to the extent billed, and
(iv) taxes, duties or other governmental charges levied on or measured by the
billing amount when included in billing, as adjusted for rebates and refunds;
provided, however, that GenQuest Net Sales shall in no event include amounts
paid to GenQuest by Corixa as royalties under this Agreement. For purposes of
determining "GenQuest Net Sales" under this Agreement, including Section 7.1
hereof, "Corixa Gene Product" shall include any products that incorporate Corixa
Gene Products.

        1.33 "GenQuest Option" has the meaning assigned to it in Section 14.8(b)
of this Agreement.

        1.34 "GenQuest Patents" means the Fisher Methodology and any Patent that
comes into the Control of GenQuest or its Affiliates with claims covering an
invention or discovery made by GenQuest (other than a GenQuest Gene Product or
GenQuest Gene Product Know-how) during the Research; excluding, however, Joint
Patents.

        1.35 "GenQuest Technology" means the GenQuest Know-how and GenQuest
Patents, collectively.

        1.36 "Identified" shall mean that the GenQuest Know-how, GenQuest Gene
Product Know-how, Existing Corixa Know-how, Corixa Know-how, Corixa Gene
Discovery Know-how or Corixa Gene Product Know-how, as the case may be, is
described or recorded in this Agreement, or as an Exhibit or Schedule hereto, or
in a separate document or recorded in any other definable form, at the latest
when such know-how is transferred or disclosed pursuant to the disclosure
obligations set forth in Section 13.1, such that the separate document or other
record can be made available if the need arises.

        1.37 "IND" has the meaning assigned to it in Section 4.1(c) of this
Agreement.

        1.38 "Information" shall mean present and future techniques, inventions
and/or discoveries, practices, methods, knowledge, know-how, skill, test data
and software encoding the same, including biological materials, pharmacological,
toxicological and clinical test data, 


                                      -5-

<PAGE>   11
sequence data, analytical and quality control data, marketing, pricing, cost,
sales and manufacturing data.

        1.39 "Joint Patent" means any Patent the subject of which is an
invention jointly invented by the parties other than a GenQuest Gene Product or
Corixa Gene Product during the Research. Inventorship shall be determined under
the laws of the jurisdiction in which the Patent was filed.

        1.40 "Material Breach" means:

               (a) with respect to GenQuest, a material breach of GenQuest's
obligations under Article 7, Article 8, Article 10, Article 11 or Article 13, or
Sections 3.1, 3.2, the first sentence of 4.5, 4.6, 4.7, 12.1, 12.2, 14.8, 15.2,
or 16.1 of this Agreement or a material breach of that certain Administrative
Services and Management Agreement between Corixa and GenQuest of even date
herewith, which breach is not cured within ninety (90) days of written notice
thereof from Corixa; and

               (b) with respect to Corixa, a material breach of Corixa's
obligations under Article 6, Article 9, Article 10, Article 11 or Article 13, or
Sections 2.3, 3.1, 3.2, the first sentence of 4.5, 4.6, 4.7, 12.1, 12.3, 14.8,
15.1, or 16.1 of this Agreement or a material breach of that certain
Administrative Services and Management Agreement between Corixa and GenQuest of
even date herewith, which breach is not cured within ninety (90) days of written
notice thereof from GenQuest.

        1.41 "Net Sales" means Corixa Net Sales and/or GenQuest Net Sales, as
applicable.

        1.42 "Patent" means any patent application or issued patent, including
all divisionals, continuations, continuations-in-part, foreign counterparts
thereof, all patents issuing on any of the foregoing and all registrations,
reissue, re-examination or renewal thereof, in each case to the extent the same
claims and discloses an invention [***].

        1.43 "Patent Costs" means the reasonable fees and expenses paid to
outside legal counsel and other Third Parties, and filing and maintenance
expenses, incurred in connection with the establishment and maintenance of
Patent rights licensed under this Agreement, including costs of interference
proceedings with respect to the Patents, but specifically excluding expenses
related to litigation, including, without limitation, any expenses related to
the enforcement or defense of any such Patent right.

        1.44 "Product" means any product developed by either GenQuest or Corixa
subsequent to the Effective Date and covered by or incorporating, including or
developed using GenQuest Technology, Corixa Technology, Joint Patents, Existing
Corixa Technology, Corixa Gene Products and/or GenQuest Gene Products, as the
case may be; provided, however, that GenQuest Gene Products shall not be deemed
"Products" for the purposes of this definition or the royalties payable pursuant
to Articles 6.1(a) of this Agreement.

        1.45 [Intentionally Omitted]



                                      -6-

<PAGE>   12

        1.46 "Regulatory Exclusivity" means the designation of a Product
developed by Corixa or GenQuest, as the case may be, as an orphan drug by the
FDA under the Orphan Drug Act, 21 C.F.R. Section 316.27, or any other regulatory
designation in a country that provides regulatory exclusivity equivalent to the
FDA's orphan drug designation.

        1.47 "Research Services Costs" shall mean the price of the services
provided by Corixa to be paid by GenQuest pursuant to Sections 8.1 and 8.2.

        1.48 "Research" means all research activities performed by or for the
parties during the Research Term pursuant to the Research Plan. Any research
performed by either party other than during the Research Term and directly
pursuant to the Research Plan shall not be deemed to constitute "Research" for
purposes of this Agreement.

        1.49 "Research Management Committee" has the meaning assigned in Article
2.

        1.50 "Research Plan" has the meaning assigned in Section 3.1.

        1.51 "Research Term" means the period commencing on the Effective Date
and ending on the first to occur of (i) termination of this Agreement or the
Research Term by either party pursuant to the terms of this Agreement or (ii)
December 23, 1999 (unless extended in writing by mutual agreement of the
parties).

        1.52 "[***]" means the technology covered by United States
Patent Application Serial No. [***], filed [***].

        1.53 "Secret" means that the GenQuest Know-how, GenQuest Gene Product
Know-how, Existing Corixa Know-how, Corixa Know-how, Corixa Gene Discovery
Know-how or Corixa Gene Product Know-how, as the case may be, as a body or in
the precise configuration and assembly of its components, is not generally known
or easily accessible at the time first learned, so that its value is readily
definable [***].

        1.54 "Substantial" means that the GenQuest Know-how, GenQuest Gene
Product Know-how, Existing Corixa Know-how, Corixa Know-how, Corixa Gene
Discovery Know-how or Corixa Gene Product Know-how, as the case may be, includes
information which is of importance for the whole or a significant part of (i) a
manufacturing process, or (ii) a product or service, or (iii) for the discovery
or development thereof, and excludes information which is trivial. [***].

        1.55 "Territory" means the entire world.



                                      -7-

<PAGE>   13

        1.56 "Third Party" means any person or entity other than GenQuest or
Corixa or their respective Affiliates.

        1.57 "Vaccine(s)" means the administration of [***], for the primary
purpose and effect of eliciting [***] immune response directed to [***]
contained therein. [***].

                                    ARTICLE 2
                          RESEARCH MANAGEMENT COMMITTEE

   
        2.1 Research Management Committee. Upon the Effective Date of this
Agreement, a Research Management Committee shall be created and such Research
Management Committee shall remain in existence for the Research Term. The
Research Management Committee shall be comprised of four (4) individuals, two
(2) individuals being appointed and replaced by GenQuest and two (2) individuals
being appointed and replaced by Corixa. In addition, each party shall have the
right to send additional representatives to meetings of the Research Management
Committee from time to time for the purpose of observing such committee
meetings. The initial GenQuest appointees shall be Paul Fisher and Neil
Goldstein and the initial Corixa appointees shall be Mark McDade and Steve Reed.
Either Corixa or GenQuest may replace their respective appointee(s) upon prior
written notice to the other party, subject to the reasonable approval of the
other party. Any changes to the size of the Research Management Committee must
be made by unanimous vote of the Board of Directors of GenQuest. The Research
Management Committee shall meet at least quarterly to review matters relating to
the Research. All actions by the Research Management Committee shall require
unanimity. The Board of Directors of GenQuest (by a vote of sixty-six and two
thirds percent (66 2/3%) of such directors) shall have the right to cast a
deciding vote to finally resolve any issues with respect to which the Research
Management Committee is unable to agree unanimously. Meetings of the Research
Management Committee may be called by either party on ten (10) days written
notice to the other unless such notice is waived by the parties in writing or by
the attendance of all representatives at such meeting. The Research Management
Committee may be convened, polled or consulted from time to time by means of
telecommunication or correspondence.
    
        2.2 Responsibilities of Research Management Committee. The purpose of
the Research Management Committee is to oversee and coordinate the day-to-day
activities of the Research in accordance with the Research Plan. The Research
Management Committee shall therefore have the authority to plan, budget,
monitor, direct and evaluate all Research activities and results. In addition,
the Research Management Committee shall periodically review the status of the
Research to determine its continued scientific viability.



                                      -8-

<PAGE>   14
               The Research Management Committee shall review and, if
applicable, revise, the Research Plan for each year of the Research. The
Research Management Committee shall also evaluate the results of the Research
and discuss information related to the Research. The Research Management
Committee shall summarize the progress of the Research in a report to the
GenQuest Board of Directors at least twice during each calendar year.

        2.3 Board Oversight of Plans; Annual Management Plan; Responsibility for
Administrative Services. The Board of Directors of GenQuest shall oversee the
activities of the Research as well as the Research Services (as defined in
Section 3) and Administrative Services (as defined below) in accordance with the
Research Plan and that certain Administrative Services and Management Agreement
dated as of the date hereof by and between Corixa and GenQuest (the
"Administrative Services Agreement"), respectively. The Board of Directors shall
periodically review the status of the Research to determine its continued
scientific and commercial viability.

               The administrative and management services to be performed by
Corixa for and on behalf of GenQuest ("Administrative Services") and the amounts
and timing of the payments therefor payable by GenQuest are described in the
Administrative Services Agreement. Corixa and GenQuest agree that the
Administrative Services Agreement shall govern Corixa's performance of the
Administrative Services until the termination of such Administrative Services
Agreement in accordance with Section 5 thereof.

                                    ARTICLE 3
                                    RESEARCH

        3.1 Collaborative Research. GenQuest and Corixa agree that they shall
conduct the Research on a collaborative basis during the Research Term in
accordance with and to the goals set forth in the Research Plan attached hereto
as Exhibit 3.1 (the "Research Plan"), as updated from time to time by the
Research Management Committee. The Research Plan shall (i) specify scientific
objectives and research milestones, (ii) allocate research responsibilities and
the location at which such research shall take place, (iii) set forth the
research to be conducted by Corixa and GenQuest, respectively, as part of the
Research (the "Research Services"), (iv) set forth the Research Services Costs
payable by GenQuest to Corixa in exchange for such Research Services in
accordance with Article 8 below, (v) establish a timeline for the Research
consistent with the objectives of the parties and (vi) set forth such other
salient information with respect to the Research as the parties deem
appropriate. Subject to Section 3.2 and Article 8 below, the Research Management
Committee shall update the Research Plan, including without limitation the
Research Services Costs, on or before each anniversary of the Effective Date
during the Research Term. In the course of conducting such Research, Corixa
and/or GenQuest, as appropriate, may contract with and make payments to Third
Parties for Research in accordance with the Research Plan; provided, however,
that any such Third Parties shall be subject to appropriate confidentiality
provisions to be agreed upon by the parties and provided, further that in no
event shall the Corixa Gene Discovery Methodologies or the GenQuest Gene
Discovery Methodologies, or any Information comprising either, be disclosed by
the licensee hereunder of such Methodologies to, or used by, such Third Parties
in the course of such Research.



                                      -9-

<PAGE>   15

        3.2 Research Efforts and Expenses.

               (a) During the Research Term, the parties shall maintain
scientific staff, laboratories, offices and other facilities appropriate and
necessary to carry out the Research Plan in accordance with the terms of the
Research Plan and shall expend reasonable diligent efforts to achieve the
objectives of the Research Plan. Each of the parties shall keep detailed records
of its Research expenditures in accordance with Section 13.3 hereof and shall
deliver to the other party, on a quarterly basis, a report of such expenditures.

               (b) Corixa shall use its best efforts to perform the Research
Services set forth in the Research Plan. In that connection, during the Research
Term, Corixa agrees to dedicate to the performance of the Research at least the
number of full-time equivalent person-years ("FTEs") per year set forth in
Schedule 3.2. It is understood that the FTEs assigned to the Research shall be
qualified scientists or experts as is required for work to be conducted under
the Research. Corixa shall keep contemporaneous written records of FTEs
allocated to the Research such as payroll records, time sheets or equivalent. In
addition, to further the purposes of the Research, during the Research Term each
party may, at its own cost, provide certain of its employees to work or meet
from time to time at the other party's facilities, subject to approval by the
Research Management Committee; provided, however, that any such employees shall
be subject to appropriate confidentiality provisions to be agreed upon by the
parties.

                                    ARTICLE 4
                                    LICENSES


        4.1 Licenses to Corixa; Limitations on Sublicense.

               (a) Subject to all of the terms and conditions of this Agreement,
including, without limitation, the royalty provisions of Section 6.1, GenQuest
hereby grants to Corixa (i) a worldwide, sublicensable, exclusive license to
GenQuest Technology, Corixa Technology and Joint Patents for any use or purpose
in the Corixa Exclusive Field in the Territory and (ii) a worldwide,
sublicensable, non-exclusive license to Corixa Technology and Joint Patents for
any use or purpose outside of the Corixa Exclusive Field and the GenQuest
Exclusive Field in the Territory. As used in this Agreement (including in
Section 4.2 and 11.3 below), a license "for any purpose" includes, without
limitation, the right to research, make, have made, use, import, sell, have sold
and otherwise distribute. The license set forth in this paragraph shall
terminate on the date one (1) year after the Research Term, unless earlier
terminable pursuant to Article 14 of this Agreement.

               (b) Subject to all of the terms and conditions of this Agreement,
including without limitation the royalty provisions of Section 6.1, contingent
upon Corixa exercising its Corixa Option pursuant to Section 14.8(a) hereof with
respect to any particular GenQuest Gene Product, GenQuest hereby grants to
Corixa a worldwide, sublicensable, exclusive license to research, make, have
made, use, import, sell, have sold and otherwise distribute such GenQuest Gene
Product in the Corixa Exclusive Field under any Patent containing claims
covering such GenQuest Gene Product and Controlled by GenQuest and any GenQuest
Gene Product



                                      -10-

<PAGE>   16
   
Know-how related to such GenQuest Gene Product. Unless this license is
terminated pursuant to the next succeeding sentence of this paragraph or
explicitly terminable pursuant to Article 14 of this Agreement, the license
granted under this Section 4.1(b) shall become non-exclusive on a
country-by-country and product-by-product basis on the later of (i) the
expiration of the last to expire Patent covering that particular GenQuest Gene
Product or (ii) ten (10) years from the date of the first commercial sale of a
product consisting of or incorporating such GenQuest Gene Product by either
party. Such license shall also terminate with respect to any particular GenQuest
Gene Product discovered outside the Research Plan at any time or after the
termination of the Research Term, as applicable, in the event Corixa has not
(itself or through an Affiliate or Third Party), within five (5) years after the
termination of the Research Term, either (x) entered into a collaboration with a
corporate partner  pursuant to which such corporate partner has agreed to pay
material consideration to Corixa in exchange for the right to develop, or fund
further research and development of, such GenQuest Gene Product for one or more
applications or (y) filed with the United States Food and Drug Administration
("FDA") (or its equivalent in another country) an application to undertake
clinical trials for or to market, or actually markets, a product based on or
incorporating such GenQuest Gene Product. If the requirements of (x) or (y)
above have been satisfied with respect to a particular GenQuest Gene Product,
the same shall be deemed satisfied for all GenQuest Gene Products that are
either (a) a variant of such GenQuest Gene Product or (b) one of the variations
set forth in the definition of GenQuest Gene Product.
    

               (c) Notwithstanding Sections 4.1(a) and 4.1(b) above, in no event
shall any GenQuest Gene Discovery Methodology, or any Information associated
therewith, be sublicensable by Corixa or its Affiliates.

        4.2 License to GenQuest; Limitation on Sublicense.

               (a) Subject to all of the terms and conditions of this Agreement,
Corixa hereby grants to GenQuest a royalty-free, perpetual, sublicensable,
exclusive, worldwide license under the Existing Corixa Technology for any use or
purpose in the GenQuest Exclusive Field in the Territory; provided, however,
that Corixa expressly reserves the right to use such Existing Corixa Technology
solely for research purposes in all fields during the period ending on the date
that is one (1) year after termination of the Research Term. As used herein, a
license "for any purpose" includes, without limitation, the right to research,
make, have made, use, sell, have sold and otherwise distribute. Notwithstanding
the foregoing, in the event Corixa deems it necessary or useful to include in a
Corixa collaboration with a Third Party rights to the [***] in the GenQuest
Exclusive Field, GenQuest agrees, at the request of Corixa, to negotiate in good
faith and for up to ninety (90) days with such Third Party for a co-exclusive
license to the [***] in the GenQuest Exclusive Field provided that, subject to
Section 4.2(d) below, the foregoing shall in no event be deemed to preclude
GenQuest from entering into any agreement with a Third Party.

               (b) Subject to all of the terms and conditions of this Agreement,
including without limitation the royalty provisions of Section 7.1, contingent
upon GenQuest exercising its GenQuest Option pursuant to Section 14.8(b) hereof
with respect to any particular Corixa Gene Product, Corixa hereby grants to
GenQuest (i) a sublicensable, worldwide, exclusive license to research, make,
have made, use, import, sell, have sold and otherwise distribute such Corixa
Gene 



                                      -11-

<PAGE>   17
   
Product in the GenQuest Exclusive Field and (ii) a sublicensable, worldwide,
non-exclusive license to research, make, have made, use, import, sell, have sold
and otherwise distribute such Corixa Gene Product in the Co-Exclusive Field,
each under any Patent with claims covering such Corixa Gene Product and
Controlled by Corixa and any Corixa Gene Product Know-how related to such Corixa
Gene Product. Unless this license is terminated pursuant to the next succeeding
sentence of this paragraph or explicitly terminable pursuant to Article 14 of
this Agreement, the license granted under this Section 4.2(b) shall become
non-exclusive on a country-by-country and product-by-product basis on the later
of (i) the expiration of the last to expire Patent covering that particular
Corixa Gene Product or (ii) ten (10) years from the date of the first commercial
sale of a product consisting of or incorporating such Corixa Gene Product by
either party. Such license shall also terminate with respect to any particular
Corixa Gene Product discovered outside the Research Plan at any time or after
the termination of the Research Term, as applicable, in the event GenQuest has
not (itself or through an Affiliate or Third Party), within five (5) years after
the termination of the Research Term, either (x) entered into a collaboration
with a corporate partner pursuant to which such corporate partner has agreed to
pay material consideration to GenQuest in exchange for the right to develop, or
fund further research and development of, such Corixa Gene Product for one or
more applications or (y) filed with the FDA (or its equivalent in another
country) an application to undertake clinical trials for or to market, or
actually markets a product based on or incorporating such Corixa Gene Product.
If the requirements or (x) or (y) above have been satisfied with respect to a
particular Corixa Gene Product, the same shall be deemed satisfied for all
Corixa Gene Products that are either (a) a variant or derivative of such Corixa
Gene Product or (b) one of the variations set forth in the definition of Corixa
Gene Product or a derivative thereof.
    

               (c) Subject to all of the terms and conditions of this Agreement,
Corixa hereby grants to GenQuest (i) a royalty-free, exclusive, worldwide
license to any Corixa Gene Discovery Methodology for any use or purpose in the
GenQuest Exclusive Field in the Territory and (ii) a royalty-free, non-exclusive
license to any Corixa Gene Discovery Methodology invented or discovered by
Corixa during the Research for any use or purpose outside the Corixa Exclusive
Field and the GenQuest Exclusive Field under any Patent with claims covering
such Corixa Gene Discovery Methodology and Controlled by Corixa and any know-how
necessary to practice such Corixa Gene Discovery Methodology; provided, however,
that Corixa expressly reserves the right to use all such Corixa Gene Discovery
Methodology solely for research purposes in all fields. The license granted and
reservation of rights taken under this Section 4.2(c) shall expire on a
country-by-country basis on the expiration of the last to expire Patent with
claims covering such Corixa Gene Discovery Methodology.

               (d) Notwithstanding Sections 4.2(a), 4.2(b) and 4.2(c) above, in
no event shall any Corixa Gene Discovery Methodology or the [***], or any
Information associated with either, be sublicensable by GenQuest.

        4.3 Assignment or Sublicense to Affiliates. Either party may assign or
sublicense any of its rights or obligations under this Agreement to any
Affiliate; provided, however, that (i) such Affiliate agrees in writing to be
bound by all of the terms and conditions of this Agreement and (ii) such
assignment shall not relieve the assigning party of its responsibilities for
performance of its obligations under this Agreement.



                                      -12-

<PAGE>   18
        4.4 Existing Third Party Technology. The licenses granted herein include
sublicenses under technology which has been or will be licensed by the
respective parties from certain Third Parties. Exhibit 4.4(a) sets forth a true
and complete list of all the Third Party licenses with respect to the Existing
Corixa Patents as well as sponsored research agreements and options related
thereto in existence as of the Effective Date and applicable to the Research, as
agreed to by the parties (the "Corixa Third Party Agreements"). Exhibit 4.4(b)
sets forth a true and complete list of all the Third Party licenses with respect
to the Fisher Methodology as well as sponsored research agreements and options
related thereto in existence as of the Effective Date and applicable to the
Research, as agreed to by the parties (the collectively with the Corixa Third
Party Agreements, the "Existing Third Party Agreements").

        4.5 Additional Technology. During the Research Term, if either party
believes that technology related to the subject matter of the Research that is
Controlled by such party or a Third Party ("Additional Technology") would be
valuable or necessary to the Research in the Field hereunder, such party shall
present such technology, along with a written report with respect thereto, to
the Research Management Committee. The Research Management Committee shall then
determine whether licenses to, and/or acquisitions of, such Additional
Technology shall be made, the party that shall approach and negotiate with any
Third Parties and the terms of any agreements with any Third Parties, including,
without limitation, payments for sponsored research. No such Third Party license
and/or acquisition shall be effective with respect to the other party unless and
until such other party has specifically agreed in writing to abide by the
applicable terms and conditions of any such license and/or acquisition (other
than payment terms, which are provided for in Sections 6.2 and 7.2 below). It is
understood and agreed that with respect to all Additional Technology, Corixa's
rights shall be limited to the Corixa Exclusive Field and GenQuest's rights
shall be limited to the GenQuest Exclusive Field. Notwithstanding the foregoing,
this Section 4.5 shall not be deemed to preclude either party from acquiring
Additional Technology.

        4.6 Internal Corixa Gene Discovery Research. During the Research Term,
Corixa agrees that in the event Corixa elects to conduct research with respect
to cancer gene discovery [***] on its own behalf ("Internal Corixa Gene
Discovery Research"), such research shall [***].

        4.7 Limitations. To the extent permitted by law, neither GenQuest nor
Corixa shall sell Products that are subject to any licenses granted hereunder to
any Affiliate or Third Party if the selling party in good faith believes that
the Product(s) in question shall be resold or used in violation of the
commercialization arrangements set forth in this Agreement. Each party shall use
reasonable efforts to correct such violations and to prevent any future
violations by Third Parties.

                                    ARTICLE 5
                                   TRADEMARKS

        5.1 Trademarks. Each of GenQuest and Corixa shall be responsible for
prosecution and/or maintenance of any trademark used by such party with respect
to Products.



                                      -13-

<PAGE>   19
                                    ARTICLE 6
                                CORIXA ROYALTIES

        6.1 Royalties.

               (a) On annual Corixa Net Sales of Products that are made or sold
in countries where (i) claims of any Corixa Research Patent or GenQuest Patent
or Joint Patent covering such Product (x) are issued or (y) have been pending
less than [***] from the later of the Effective Date or the date of filing of
such claim or (ii) such Product has received Regulatory Exclusivity, Corixa
shall pay to GenQuest a royalty of [***] on annual Net Sales of such Product 
(the "Corixa Patent Royalty"); provided, however, that royalty shall be reduced
to be equal to [***] of the net royalty payable to Corixa by [***] pursuant to
Section [***] of that certain [***] Agreement dated [***] between Corixa [***]
(the "[***] Agreement") for Corixa Net Sales of such Products made pursuant to
the [***] Agreement (and for which [***] is obligated to pay a royalty to Corixa
pursuant to the [***] Agreement). The obligation to pay royalties under this
subsection 6.1(a) shall expire on a country-by-country and product-by-product
basis on the later of (i) the expiration of the last to expire GenQuest Patent,
Corixa Research Patent or Joint Patent with claims covering such Product or (ii)
[***] from the date of the first commercial sale of such Product by Corixa in
such country. As used herein and in Section 6.1(b), it is understood that "net"
royalty shall mean the royalty actually received by Corixa, less any portion of
such royalty paid by Corixa to a Third Party pursuant to an agreement under
which Corixa acquired rights to technology incorporated into such Product.

               (b) If Corixa has actually received and uses Information
Controlled by GenQuest or Corixa in any Product, which Information Controlled by
GenQuest is Secret, Substantial and has been Identified by GenQuest, on annual
Corixa Net Sales of such Product in any country, Corixa shall pay the percentage
royalty rates specified in subparagraph 6.1(a) above where (x) a patent
application for a Corixa Research Patent and/or a GenQuest Patent and/or a Joint
Patent with claims covering such Product has been pending more than [***] from
the later of the Effective Date or the date of filing of such claim, and no
patent with claims covering such Product has issued or (y) no patent application
with claims covering such Product has been filed in the country of sale (the
"Corixa Know-how Royalty"). Royalties under this subparagraph 6.1(b) shall
expire, on a country-by-country and product by product basis, [***] after first
launch of such a Product by Corixa in any such country. The Corixa Know-how
Royalty shall not apply to Corixa Net Sales of GenQuest Gene Products, which
shall be solely governed by Section 6.1(c) of this Agreement.

               (c) On annual Corixa Net Sales of GenQuest Gene Products made or
sold in countries where (i) current claims of any patent or patent application
covering any GenQuest Gene Product (x) are issued or (y) have been pending less
than [***] from the later of the Effective Date or the date of filing of such
claim or (ii) such GenQuest Gene Product has received Regulatory Exclusivity,
Corixa shall pay to GenQuest a royalty of [***] on annual Corixa Net Sales of 
each product incorporating or consisting of any GenQuest Gene Product (the
"Corixa Gene Patent Royalty"); provided, however, that royalty shall be reduced
to be equal to [***] of the net royalty payable to Corixa by [***] pursuant to 



                                      -14-

<PAGE>   20

Section [***] of the [***] Agreement for Corixa Net Sales of such GenQuest Gene
Products made pursuant to the [***] Agreement (and for which [***] is obligated
to pay a royalty to Corixa pursuant to the [***] Agreement). The obligation to
pay royalties under this Section 6.1(c) shall expire on a country-by-country and
product-by-product basis on the later of (i) the expiration of the last to
expire of any patent with claims covering such GenQuest Gene Product or (ii)
[***] from the date of the first commercial sale of such GenQuest Gene Product
by Corixa in such country.

        6.2 Third Party Agreements. Corixa acknowledges that it has reviewed
that certain [***] Agreement between [***] and [***] dated [***] (the "[***]
License Agreement") pursuant to which Corixa receives a sublicense under this
Agreement. Corixa agrees to abide, or cause its Affiliates or sublicensees to
abide, by the terms and conditions of the [***] License Agreement, as may be
amended from time to time, or any agreements applicable to Additional Technology
and applicable to sublicensees thereunder. Corixa will pay all amounts payable
under the [***] License Agreement and any other agreements with Third Parties
under which Corixa acquires Additional Technology, in each case by reason of the
exercise by Corixa, its Affiliates or sublicensees of the licenses granted
hereunder with respect to the Corixa Exclusive Field. GenQuest will pay all
amounts payable under the [***] License Agreement and any other agreements with
Third Parties under which GenQuest acquires Additional Technology, in each case
by reason of the exercise by GenQuest, its Affiliates or sublicensees of the
licenses granted hereunder with respect to the GenQuest Exclusive Field.

        6.3 Reporting and Payment of Royalties. Corixa shall deliver to GenQuest
within ninety (90) days after the end of each calendar quarter a written
account, including quantities, of Corixa's and Corixa's Affiliates' and
sublicensees' sales subject to royalty payments hereunder and the amount of the
royalty payment due to GenQuest for such calendar quarter. When Corixa delivers
the accounting to GenQuest, Corixa shall also deliver all royalty payments due
to GenQuest for such calendar quarter. Such royalties shall be calculated on the
Corixa Net Sales in the local currency of each country, and converted into U.S.
Dollars and paid in U.S. Dollars on the basis of the currency exchange rate
published in the Wall Street Journal or comparable newspaper of international
circulation on the last business day of such calendar quarter. In the event of
Corixa Net Sales being made in a currency as to which conversion into U.S.
Dollars is then blocked, Corixa shall make payment to GenQuest in such local
currency in a bank account designated by GenQuest. Corixa shall withhold any
taxes on such royalties required by law. Corixa shall use reasonable diligent
efforts to reduce such withholdings to the greatest extent possible. Any refunds
or rebates of taxes paid by Corixa on behalf of GenQuest shall be remitted
promptly by Corixa to GenQuest. Royalty payments not made by Corixa within the
ninety (90) day period set forth above shall accrue interest at the annual rate
of [***], compounded annually.

        6.4 Samples or Donations to Third Parties No royalties shall accrue on
the disposition of reasonable quantities of Products and Gene Products by Corixa
for no consideration as samples or donations to Third Parties; provided,
however, that such quantities shall not exceed [***] of the total number of 
units of Products or Gene Products, respectively, dispensed by Corixa, whether 
by sale or otherwise, during any particular quarter.



                                      -15-

<PAGE>   21
                                    ARTICLE 7
                               GENQUEST ROYALTIES

   
        7.1 Royalties. On annual GenQuest Net Sales of Corixa Gene Products
invented or discovered after termination of the Research Term that are made or
sold in countries where current claims of any Patent covering Corixa Gene
Products (x) are issued or (y) have been pending less than seven (7) years from
the later of the Effective Date or the date of filing of such claim or (ii) such
Corixa Gene Product has received Regulatory Exclusivity, GenQuest shall pay to
Corixa a royalty of [***] on annual GenQuest Net Sales of each product
incorporating or consisting of any Corixa Gene Product (the "GenQuest Gene
Patent Royalty"). The obligation to pay royalties under this subsection 7.1(a)
shall expire on a country-by-country and product-by-product basis on the later
of (i) expiration of the last to expire of any Patent with claims covering such
Corixa Gene Product or (ii) ten (10) years from the date of the first commercial
sale of such a Corixa Gene Product by GenQuest in such country.
    
        7.2 Third Party Agreements.

               (a) GenQuest acknowledges that it has reviewed each Corixa Third
Party Agreement set forth on Exhibit 4.4(a) pursuant to which it shall receive a
sublicense under this Agreement. GenQuest agrees to abide, or cause its
Affiliates or sublicensees to abide, by the terms and conditions of each such
Corixa Third Party Agreement, and any agreements applicable to Additional
Technology and applicable to sublicensees thereunder. GenQuest will pay all
amounts payable under all agreements with Third Parties under which GenQuest
acquires Additional Technology, in each case by reason of the exercise by
GenQuest, its Affiliates or sublicensees of the licenses granted hereunder with
respect to the GenQuest Exclusive Field. Corixa will pay all amounts payable
under all agreements with Third Parties under which Corixa acquires Additional
Technology, in each case by reason of the exercise by Corixa, its Affiliates or
sublicensees of the licenses granted hereunder with respect to the Corixa
Exclusive Field

        7.3 Reporting and Payment of Royalties. GenQuest shall deliver to Corixa
within ninety (90) days after the end of each calendar quarter a written
account, including quantities, of GenQuest's and GenQuest's Affiliates' and
sublicensees' sales subject to royalty payments hereunder and the amount of the
royalty payment due to Corixa for such quarter. When GenQuest delivers the
accounting to Corixa, GenQuest shall also deliver all royalty payments due to
Corixa for such calendar quarter. Such royalties shall be calculated on the
GenQuest Net Sales in the local currency of each country, and converted into
U.S. Dollars and paid in U.S. Dollars on the basis of the currency exchange rate
published in the Wall Street Journal or comparable newspaper of international
circulation on the date such royalty payment is due to be made to Corixa. In the
event of GenQuest Net Sales being made in a currency as to which conversion into
U.S. Dollars is then blocked, GenQuest shall make payment to Corixa in such
local currency in a bank account designated by Corixa. GenQuest shall withhold
any taxes on such royalties required by law. GenQuest shall use reasonable
diligent efforts to reduce such withholdings to the greatest extent possible.
Any refunds or rebates of taxes paid by GenQuest on behalf of Corixa shall be
remitted promptly by Corixa to GenQuest. Royalty payments not made by GenQuest
within the ninety (90) day period set forth above shall accrue interest at the
annual rate of [***], compounded annually.



                                      -16-

<PAGE>   22

        7.4 Samples or Donations to Third Parties. No royalties shall accrue on
the disposition of reasonable quantities of Products or Gene Products by
GenQuest for no consideration as samples or donations to Third Parties;
provided, however, that such quantities shall not exceed [***] of the total 
number of units of Products or Gene Products, respectively, dispensed
by GenQuest, whether by sale or otherwise, during any particular quarter.

                                    ARTICLE 8
                          PAYMENTS; OTHER CONSIDERATION

        8.1 FTE Reimbursement. During the Research Term, GenQuest shall pay
Corixa the amounts set forth on Schedule 3.2 hereto; provided, however, that the
parties agree that in no event shall the amount paid to Corixa per quarter to
Corixa be less than such amounts without Corixa's prior written consent,
provided that Corixa has applied to the Research at least the number of FTEs set
forth in Schedule 3.2. It is understood that, except as provided in Section 8.2
below, the FTE costs to be paid under this Section 8.1 include all costs to be
reimbursed to Corixa with respect to Corixa's performance of its
responsibilities under the Research Plan.

        8.2 Other Expenses. In addition to the funding for the Corixa FTEs
performing the Research pursuant to Section 8.1, GenQuest shall reimburse
Corixa, within thirty (30) days from receipt of an invoice, for other expenses,
if any (i) expressly provided for in the applicable Research Plan, and (ii)
incurred by Corixa in performing the Research in accordance with such Research
Plan.

        8.3 Payment. GenQuest shall pay to Corixa quarterly in advance the
amounts provided for in Sections 8.1 above, not later than January 1, April 1,
July 1 and October 1 of each year during the Research Term; such payments shall
be applied solely towards the FTE costs set forth on Schedule 3.2. For the
period from the Execution Date through the first such payment date, such
amounts, to the extent they have not been paid before, shall be paid within ten
(10) days from the Effective Date.

        8.4 Research Plan Amendment. The Research Services Costs shall not be
modified without the approval of both Corixa and GenQuest, regardless of whether
any changes are made to the Research or Research Plan.

                                    ARTICLE 9
                                     EQUITY

                             [INTENTIONALLY OMITTED]


                                   ARTICLE 10
                                 CONFIDENTIALITY

        10.1 Confidentiality; Exceptions. Except to the extent expressly
authorized by this Agreement or otherwise agreed in writing, the parties agree
that, for the term of this Agreement and for five (5) years thereafter, the
receiving party shall keep confidential and shall not publish or otherwise
disclose or use for any purpose other than as provided for in this Agreement any
Information and other information and materials furnished to it by the other
party pursuant to this 



                                      -17-

<PAGE>   23

Agreement (collectively, "Confidential Information"), except to the extent that
it can be established by the receiving party by competent proof that such
Confidential Information:

               (a) was already known to the receiving party at the time of
disclosure by the other party;

               (b) was generally available to the public or otherwise part of
the public domain at the time of its disclosure to the receiving party.

               (c) became generally available to the public or otherwise part of
the public domain after its disclosure and other than through any act or
omission of the receiving party in breach of this Agreement; or

               (d) was disclosed to the receiving party, other than under an
obligation of confidentiality, by a Third Party who had no obligation to the
disclosing party not to disclose such information to others.

        10.2 Authorized Disclosure. Each party may disclose the other's
Confidential Information to the extent such disclosure is reasonably necessary
in filing or prosecuting patent applications, prosecuting or defending
litigation, complying with applicable governmental regulations or conducting
preclinical or clinical trials, provided that if a party makes any such
disclosure of the other party's Confidential Information it shall give
reasonable advance notice to the other party of such disclosure requirement and,
except to the extent inappropriate in the case of patent applications, shall use
its best efforts to secure confidential treatment of such Confidential
Information required to be disclosed. Each party may also disclose Confidential
Information to (a) Third Parties with whom such party is actively engaging in
discussions with respect to an agreement to sublicense or collaborate, or has
agreed to sublicense or collaborate, on the research, development, marketing and
sale of compounds or products, (b) Third Parties that have expressed bona fide
interest in providing financing for such party, or (c) Affiliates; provided that
such Third Party or Affiliate (as the case may be) agrees in writing to
restrictions substantially similar to the restrictions set forth in Section 10.1
and that the party making such disclosure shall give periodic notice to the
other party of the content of such disclosures. With respect to the preceding
sentence, Corixa's right of disclosure relating to GenQuest Gene Discovery
Methodologies shall be limited to patents and patent applications and shall not
include the right to disclose Information relating thereto and GenQuest's right
of disclosure relating to Corixa's Gene Discovery Methodologies shall be limited
to patents and patent applications and shall not include the right to disclose
Information relating thereto.

        10.3 Confidentiality Agreements with Employees. Each party will have
each of their employees, consultants and officers execute an agreement with the
other party regarding confidentiality and proprietary information of such other
party in form and substance reasonably agreed by Corixa and GenQuest.

                                   ARTICLE 11
              OWNERSHIP OF INTELLECTUAL PROPERTY AND PATENT RIGHTS



                                      -18-

<PAGE>   24
        11.1 Non-Gene Product Inventions Resulting from the Research Ownership
and disclosure of all inventions and/or discoveries made during the Research
that are not either Corixa Gene Products or GenQuest Gene Products shall be
handled as set forth in this Section 11.1. During the Research Term, GenQuest
shall promptly inform Corixa of all inventions and/or discoveries made during
the Research and that are conceived, made or developed by employees or service
providers of GenQuest, solely or jointly with employees or service providers of
Corixa. During the Research Term, Corixa shall promptly inform GenQuest of all
inventions and/or discoveries made during the Research and that are conceived,
made or developed by employees or service providers of Corixa, solely or jointly
with employees or service providers of GenQuest. Inventions and/or discoveries
made during the Research shall be owned as follows:

               (a) Such inventions and/or discoveries (other than Gene Products)
discovered or invented during the Research Term shall be owned by Corixa if
invented solely by service providers or employees of Corixa. All patent
applications and patents covering such discoveries or inventions shall be Corixa
Research Patents (whether such patent applications were filed or patents were
issued before or after the end of the Research Term).

               (b) Such inventions and/or discoveries (other than Gene Products)
shall be owned by GenQuest if invented solely by service providers or employees
of GenQuest. All patent applications and patents covering such inventions and/or
discoveries shall be GenQuest Patents (whether such patent applications were
filed or patents were issued before or after the end of the Research Term).

               (c) Such inventions and/or discoveries (other than Gene Products)
shall be owned jointly by Corixa and GenQuest if invented jointly by or on
behalf of service providers or employees of Corixa and GenQuest. All such patent
applications and patents pertaining to jointly developed inventions and/or
discoveries shall be Joint Patents (whether such patent applications were filed
or patents were issued before or after the end of the Research Term). With
respect to any subject matter that is owned jointly by Corixa and GenQuest
hereunder, each party shall have the right to exploit and license the same
(subject to the exclusive rights granted pursuant to this Agreement), without
the consent of the other party and without any obligation to account to the
other party.

        11.2 Gene Product Inventions Resulting from the Research. Gene Product
inventions and/or discoveries made during the Research shall be owned as
follows:

               (a) Such inventions and/or discoveries (including Gene Products)
discovered or invented during the Research Term shall be owned by Corixa if
invented solely by service providers or employees of Corixa. All patent
applications and patents covering such discoveries or inventions shall be Corixa
Gene Product Patents (whether such patent applications were filed or patents
were issued before or after the end of the Research Term).

               (b) Such inventions and/or discoveries (including Gene Products)
discovered or invented during the Research Term shall be owned by GenQuest if
invented solely by service providers or employees of GenQuest or if invented
jointly by or on behalf of Corixa and GenQuest by service providers or employees
of Corixa and GenQuest. All patent applications 



                                      -19-

<PAGE>   25

and patents covering such inventions and/or discoveries shall be GenQuest Gene
Product Patents (whether such patent applications were filed or patents were
issued before or after the end of the Research Term)

        11.3 Grants to GenQuest.

               (a) Subject to all of the terms and conditions of this Agreement,
including the licenses back to Corixa set forth in Sections 4.1(a) and 4.1(b),
Corixa hereby grants to GenQuest a perpetual, royalty-free, worldwide,
sublicensable, exclusive (even as to Corixa) license to Corixa Technology and
Corixa's interest in Joint Patents for any use or purpose in the Territory; and
provided further that Corixa expressly reserves the right to use such Corixa
Technology and Joint Patents for research purposes in all fields, provided that
such reservation of rights shall terminate in the GenQuest Exclusive Field on
the date that is one (1) year after termination of the Research Term. The
license set forth in this paragraph shall continue in perpetuity unless
explicitly terminable pursuant to Section 14.5(b) or 14.6 of this Agreement.

               (b) Subject to all of the terms and conditions of this Agreement,
Corixa hereby grants to GenQuest a perpetual, royalty-free, worldwide,
sublicensable, exclusive (even as to Corixa) license to Corixa Gene Products and
Corixa Gene Product Know-how invented or discovered during the Research for any
use or purpose in the Territory outside the Corixa Exclusive Field; and provided
further that Corixa expressly reserves the right to use such Corixa Gene
Products and Corixa Gene Product Know-how for research purposes in all fields,
provided that such reservation of rights shall terminate in the GenQuest
Exclusive Field on the date that is one (1) year after termination of the
Research Term. The license set forth in this paragraph shall continue in
perpetuity unless explicitly terminable pursuant to Article 14 of this
Agreement. The license grant set forth in this Section 11.3(b) does not include
the right to any Corixa Gene Products or Corixa Gene Product Know-how invented
or discovered after the Research Term.

        11.4 GenQuest Responsibility for Patent Filings. Except as set forth in
the proviso to the next succeeding sentence, GenQuest shall diligently file,
prosecute and maintain Corixa Research Patents, GenQuest Patents, Joint Patents,
GenQuest Gene Product Patents and Corixa Gene Product Patents to effectively
cover discoveries and inventions arising during the Research, and the Patent
Costs incurred in connection with such filing, prosecution and maintenance shall
be borne equally by GenQuest and Corixa. GenQuest shall use its best efforts to
ensure that claims are filed and are issued in such Patents and that all such
Patents are filed before any public disclosure to ensure the validity of such
Patents; provided, however, that GenQuest shall have the right to choose not to
file, prosecute and maintain Corixa Research Patents, GenQuest Patents and Joint
Patents in any territory in the world, in which case GenQuest shall be subject
to the notice and payment obligations set forth in Section 11.5 hereof. GenQuest
shall give Corixa immediate notice of any decision to prepare a Patent relating
to the Field, along with a list of all territories in which GenQuest intends to
file such Patent. GenQuest shall provide Corixa with draft copies of all such
Patents and related Patent prosecution documents and Corixa shall have, to the
extent reasonably possible, thirty (30) days from the receipt of such drafts to
comment. GenQuest shall confer with Corixa, and make reasonable efforts to adopt
Corixa's suggestions regarding the prosecution of Patents relating solely to the
Corixa Exclusive Field and the fields of adjuvants and infectious disease
Vaccines. Notwithstanding the foregoing, GenQuest shall have



                                      -20-

<PAGE>   26

the right to take such actions as are reasonably necessary, in its good faith
judgment, to preserve the rights under Corixa Research Patents, GenQuest Patents
and Joint Patents in the territories in which it has chosen to file. As soon as
practical subsequent to any filing of a Patent or Patent prosecution document
relating to the Field, GenQuest shall provide Corixa a copy of any such filing.
In addition, GenQuest shall copy Corixa with any official action and GenQuest
submissions in such Patents, including an English translation thereof. GenQuest
shall have no obligation to file Corixa Gene Product Patents for Corixa Gene
Products invented and/or discovered after the Research Term.

        11.5 Back-Up Rights. Should GenQuest determine not to file, prosecute,
maintain or issue a Corixa Research Patent, GenQuest Patent or Joint Patent or
related application for any invention related to the Corixa Exclusive Field in
any particular country or jurisdiction in the Territory, it shall immediately
grant any and all authority necessary to allow Corixa to timely file, prosecute,
maintain and issue such a patent application or maintain such a patent in the
Territory, with [***] of the related Patent Costs offset against royalties 
otherwise payable to GenQuest pursuant to Section 6 of this Agreement with 
respect to such Patent.

        11.6 Enforcement and Defense Rights.

               (a) With respect to infringement or defense of any of the Corixa
Research Patents, GenQuest Patents, Corixa Gene Product Patents, GenQuest Gene
Product Patents and Joint Patents, both inside and outside the Corixa Exclusive
Field, for which GenQuest has taken filing responsibility pursuant to Section
11.4 hereof, GenQuest shall have the right to institute and prosecute any action
or proceeding with respect to such infringement or defense. GenQuest shall have
the right, in its discretion, to invite Corixa to participate in such action and
if Corixa chooses to participate, the parties agree to cooperate equally in such
action, with Corixa bearing [***] of the costs of such action. The parties shall
consult regarding the institution, prosecution and control of any action or
proceeding with respect to infringement or defense of any such Patents. In the
event of sole enforcement and defense by GenQuest, [***]. In the event of shared
enforcement and defense, [***].

               (b) With respect to infringement or defense of any of the Corixa
Research Patents, GenQuest Patents and Joint Patents, both inside and outside
the Corixa Exclusive Field, for which Corixa has taken filing responsibility
pursuant to Section 11.5 hereof, Corixa shall have the sole right to institute
and prosecute any action or proceeding with respect to such infringement or
defense. Corixa shall use best efforts to protect any exclusivity granted to
GenQuest pursuant to this Agreement. Corixa shall have the right, in its
discretion, to invite GenQuest to participate in such action and if GenQuest
chooses to participate, the parties agree to cooperate equally in such action,
with GenQuest bearing [***] of the costs of such action. The parties shall
consult regarding the institution, prosecution and control of any action or
proceeding with respect to infringement or defense of any Corixa Research
Patents, GenQuest Patents or Joint Patents. In the event of sole enforcement and
defense by Corixa, [***]. In the event of shared enforcement and defense, [***].



                                      -21-

<PAGE>   27

        11.7 Patent Costs. [Intentionally Omitted].

        11.8 Infringement of Third Party Patents.

               (a) If any Third Party asserts a claim of patent infringement
against Corixa on account of Corixa's use, manufacture or sale of Products or
GenQuest Gene Products in the Territory, Corixa shall promptly notify GenQuest
of the existence and details of such claim. Subject to the terms of any Third
Party Agreements, GenQuest shall at its election choose and do one of the
following: (i) negotiate with said Third Party for the right to have Corixa use,
manufacture and/or sell Products or GenQuest Gene Products in the Corixa
Exclusive Field in the Territory; or (ii) defend Corixa against such claim; or
(iii) should GenQuest not elect either (i) or (ii) above, GenQuest shall
reasonably cooperate with Corixa in defending against such claim. In the event
GenQuest elects (i) or (ii) above, Corixa shall reasonably cooperate with
GenQuest.

               (b) If any Third Party asserts a claim of patent infringement
against GenQuest on account of GenQuest's use, manufacture or sale of Corixa
Gene Products in the Territory, GenQuest shall promptly notify Corixa of the
existence and details of such claim. Subject to the terms of any existing Third
Party Agreements, Corixa shall at its election choose and do one of the
following: (i) negotiate with said Third Party for the right to have GenQuest
use, manufacture and/or sell Corixa Gene Products in the Corixa Exclusive Field
in Territory; or (ii) defend GenQuest against such claim; or (iii) should Corixa
not elect either (i) or (ii) above, GenQuest shall reasonably cooperate with
Corixa in defending against such claim. In the event Corixa elects (i) or (ii)
above, GenQuest shall reasonably cooperate with Corixa.

                                   ARTICLE 12
                    REPRESENTATIONS, WARRANTIES AND COVENANTS

        12.1 Representations, Warranties and Covenants of Both Parties. Each of
the parties hereby represents, warrants and covenants as follows:

               (a) This Agreement is a legal and valid obligation binding upon
such party and enforceable in accordance with its terms. The execution, delivery
and performance of the Agreement by such party does not conflict with any
agreement, instrument or understanding, oral or written, to which it is a party
or by which it is bound, nor violate any law or regulation of any court,
governmental body or administrative or other agency having jurisdiction over it.

               (b) Such party has not, and during the term of the Agreement
shall not, grant any right to any Third Party relating to its respective
technology in the Field which would abrogate the rights granted to the other
party hereunder.

        12.2 Representations, Warranties and Covenants of GenQuest Except as set
forth on Schedule 12.2 hereto (the "GenQuest Schedule of Exceptions"), GenQuest
hereby represents, warrants and covenants as follows:

   
               (a) As of the Execution Date, except for rights granted to IDEC,
GenQuest has not granted to any Third Party any rights or interests to the
GenQuest Patents, GenQuest Gene Discovery Methodologies (including but not
limited to the Fisher Methodology), GenQuest 
    


                                      -22-

<PAGE>   28

Gene Product Know-how or the GenQuest Know-how. Neither the execution or
delivery of this Agreement nor the consummation of the transactions contemplated
hereunder, requires GenQuest to obtain any permits, authorizations or consents
from any governmental body or from any other body, person, form or corporation
and such execution, delivery and consummation shall not result in the breach of
or give rise to cause for termination of any agreement or contract to which
GenQuest or its Affiliates may be a party. Neither GenQuest nor its Affiliates
shall take any action after the Effective Date that would in any way restrict
its legal right to grant to Corixa the rights and licenses contemplated under
this Agreement.

   
               (b) As of the date hereof, except as otherwise known to Corixa,
the Columbia License Agreement is in full force and effect and GenQuest is in
compliance in all material respects with all of its material obligations
thereunder; GenQuest has heretofore delivered to Corixa a true and complete copy
thereof and there have been no amendments or modifications thereof. So as not to
adversely affect Corixa rights hereunder or under the Columbia License
Agreement, GenQuest agrees during the term of this Agreement not to take any
actions to terminate or restrict its rights under the Columbia License Agreement
and to discharge all of GenQuest's material obligations and responsibilities
thereunder, including, without limitation, making all required payments
thereunder. In the event GenQuest shall receive any notice of default under the
Columbia License Agreement, GenQuest shall promptly notify Corixa.

               (c) GenQuest has not, and to GenQuest's best knowledge without
having undertaken any special investigation, Columbia University has not,
received any notice of infringement of or conflict with the patents or other
proprietary rights of Third Parties with respect to the GenQuest Technology.
    
               (d) GenQuest has not been a defendant in any action, suit,
investigation or proceeding relating to, or otherwise has been notified of, any
alleged claim or infringement of any GenQuest Technology and GenQuest has no
knowledge of any continuing infringement by any Third Party of any of any
GenQuest Technology. No GenQuest Technology is subject to any outstanding
judgment, injunction, order or decree restricting the use thereof by GenQuest or
restricting the licensing thereof by GenQuest. None of the Information of
GenQuest, the value of which to GenQuest is contingent upon maintenance of the
confidentiality thereof, has been disclosed by GenQuest other than to employees,
representatives and agents of GenQuest all of whom are bound by written
confidentiality agreements substantially in the form previously disclosed to
GenQuest.

               (e) GenQuest will use its best efforts to make available and
deliver to Corixa all materials necessary or useful for Corixa to carry out its
obligations under the Research Plan as determined by the Research Management
Committee, within ten (10) days after the Research Management Committee so
determines. Corixa may request such materials by making such request to the
Research Management Committee and the Research Management Committee shall
promptly make a determination related thereto. [***].



                                      -23-

<PAGE>   29

               (f) To GenQuest's best knowledge, set forth on Exhibit 1.24
hereto are all patents and/or patent applications existing as of the Effective
Date and relating to the methodology for discovering genes that is the subject
of the [***] License Agreement. GenQuest will update such Exhibit 1.24 within
thirty (30) days of the Effective Date with all additional patent and/or patent
applications relating to such methodology, and thereafter from time to time
during the Research Term, such that Exhibit 1.24 at all times contains a
complete listing of all such patents and/or patent applications.

               (g) To GenQuest's best knowledge, set forth on Exhibit 12.2(g)
hereto is a listing of all GenQuest Gene Products existing as of the Effective
Date.

        12.3 Representations, Warranties and Covenants of Corixa. Except as set
forth on Schedule 12.3 hereto (the "Corixa Schedule of Exceptions"), Corixa
hereby represents, warrants and covenants as follows:

               (a) Corixa has not granted to any Third Party any rights or
interests to the Existing Corixa Patents or the Existing Corixa Know-how.
Neither the execution or delivery of this Agreement nor the consummation of the
transactions contemplated hereunder, requires Corixa to obtain any permits,
authorizations or consents from any governmental body or from any other body,
person, form or corporation and such execution, delivery and consummation shall
not result in the breach of or give rise to cause for termination of any
agreement or contract to which Corixa or its Affiliates may be a party. Neither
Corixa nor its Affiliates shall take any action after the Effective Date that
would in any way restrict its legal right to grant to GenQuest the rights and
licenses contemplated under this Agreement.

               (b) Corixa has not received any notice of infringement of or
conflict with the patents or other proprietary rights of Third Parties with
respect to the Corixa Technology.

               (c) Corixa has not, and to Corixa's best knowledge without having
undertaken any special investigation, no licensor to Corixa under any existing
Third Party Agreement has, received any notice of infringement of or conflict
with the patents or other proprietary rights of Third Parties with respect to
the Existing Corixa Technology.

               (d) Corixa has not been a defendant in any action, suit,
investigation or proceeding relating to, or otherwise has been notified of, any
alleged claim or infringement of any Corixa Technology or Existing Corixa
Technology and Corixa has no knowledge of any continuing infringement by any
Third Party of any of any Corixa Technology or Existing Corixa Technology. No
Corixa Technology or Existing Corixa Technology is subject to any outstanding
judgment, injunction, order or decree restricting the use thereof by Corixa or
restricting the licensing thereof by Corixa. None of the Corixa Know-how or
Existing Corixa Know-how , the value of which to Corixa is contingent upon
maintenance of the confidentiality thereof, has been disclosed by Corixa other
than to employees, representatives and agents of Corixa all of whom are bound by
written confidentiality agreements substantially in the form previously
disclosed to GenQuest.



                                      -24-

<PAGE>   30

               (e) Corixa shall use reasonable commercial efforts to cause each
employee, officer and consultant of Corixa to execute a Proprietary Information
and Inventions Agreement in the form provided to GenQuest.

   
               (f) Prior to the expiration of Corixa's royalty obligations to
GenQuest under Sections 6.1(a) and 6.1(c) of this Agreement, Corixa shall not
enter into any amendment of the CellPro Agreement which reduces the royalty
percentage payable to Corixa from CellPro pursuant to Section 6.1 of such
CellPro Agreement.
    
               (g) To Corixa's best knowledge, set forth on Exhibit 1.19 hereto
are all patents and/or patent applications and/or disclosures within the Control
of Corixa as of the Execution Date and relating to the subject matter of such
patents and/or patent applications and/or disclosures with respect to the
GenQuest Exclusive Field.

               (h) Corixa will use its best efforts to make available and
deliver to GenQuest all materials in Corixa's Control that are necessary or
useful for GenQuest to carry out its obligations under the Research Plan, as
determined by the Research Management Committee, within ten (10) days after the
Research Management Committee so determines. GenQuest may request such materials
by making such request to the Research Management Committee and the Research
Management Committee shall promptly make a determination related thereto.

   
               (i) During the Research Term, Corixa will not enter into any
corporate partnering or collaborative relationships except those that have as
their primary research focus at Corixa work outside the GenQuest Exclusive
Field. In negotiating such collaborations, Corixa will ensure that any Corixa
Gene Products invented during the course of research conducted under such
collaboration will be licensed to GenQuest for the GenQuest Exclusive Field.

               (j) During the Research Term, Corixa may specifically enter into
corporate partnering or collaborative relationships that have as an aspect of
the relationship genomics work; provided, however, that the primary focus of
such relationship is to discover and/or develop products within the Corixa
Exclusive Field.  Otherwise, corporate partnering and collaborative
relationships that are focused upon cancer genomics shall first be offered to
GenQuest; provided that if GenQuest does not agree within 90 days to conduct
such work on reasonable terms and conditions, then Corixa shall be free to
enter into such corporate partnering or collaborative relationships with Third
Parties for cancer genomics; provided further that Corixa will use its best
efforts to ensure that any agreement negotiated provides that any Corixa Gene
Products invented during the course of research conducted under such
collaboration will be licensed to GenQuest for the GenQuest Exclusive Field.

               (k) Except items described in Exhibit 1.9 hereto, the Existing
Corixa Technology includes all technology owned by or licensed to Corixa as of
the Execution Date that relates to cancer-associated genes, their gene products
or the discovery thereof.

               (l) During the Research Term, Corixa agrees that in the event
Corixa elects to conduct research with respect to cancer gene discovery within
the Field and outside of the Research Plan on its own behalf ("Internal Corixa
Gene Discovery Research"), such research shall be directed solely at
applications within the Corixa Exclusive Field.
    


                                      -25-

<PAGE>   31

                                   ARTICLE 13
                          REPORTS, RECORDS AND PAYMENTS

        13.1 Sharing of Information. Subject to the time limitations set forth
in the last sentence of this paragraph, beginning May 1, 1996, and every ninety
(90) days thereafter, the parties shall exchange written reports presenting a
meaningful summary of the parties' activities pursuant to this Agreement, which
reports shall include, at a minimum, a detailed description of (a) the Research
and Information arising therefrom, (b) any Corixa Gene Product and Corixa Gene
Product Know-how or GenQuest Gene Product and GenQuest Gene Product Know-how, as
the case may be, invented and/or discovered by such party since the date of the
last such report, including sequencing and methodology information related
thereto, (c) all Information related to Corixa Gene Discovery Methodologies and
GenQuest Gene Discovery Methodologies and (c) such other information the
disclosing party reasonably believes the other party would find reasonably
useful to carry out the goals of this Agreement. Each party shall provide the
other with raw data in original form or a photocopy thereof for any and all work
carried out in the course of the Research as reasonably requested by the other
party. The reports required by this Section 13.1 shall be provided for the
duration of the Research Term and one additional reporting period after the
termination of the Research Term, except that Information with respect to Gene
Products shall continue to be exchanged for the respective option terms set
forth in Section 14.9.

        13.2 Records of Net Sales. Each of Corixa and GenQuest shall maintain
complete and accurate records of Net Sales which are relevant to the payments to
be made under this Agreement. Such records shall be open during reasonable
business hours for a period of five (5) years from their creation for
examination at the other party's expense and not more often than once each year
by a certified public accountant selected by the examining party and reasonably
acceptable to the party maintaining the records. Such accountant shall review
the records for the sole purpose of verifying the accuracy of the calculations
or payments made under this Agreement and such information shall be considered
confidential under the terms of this Agreement. In the event the examination
shows an underpayment of more than [***] for any calendar quarter examined due
to an error on the part of the record-keeping party, such party shall pay the
examining party the amounts underpaid, [***] of such amounts, and the cost of
such examination.

        13.3 Records of Research Expenditures. Each of Corixa and GenQuest shall
maintain complete and accurate records of expenditures for Research. Such
records shall be open during reasonable business hours for a period of five (5)
years from their creation for examination at the other party's expense and not
more often than once a year by a certified public accountant selected by mutual
agreement of the parties. Such accountant shall review the records for the sole
purpose of verifying the accuracy of expenditures reported by the applicable
party under this Agreement and such information shall be considered confidential
under the terms of this Agreement.

        13.4 Publicity Review. The parties agree that the public announcement of
the execution of this Agreement shall be in the form of a press release to be
agreed upon by the parties. Thereafter, GenQuest and Corixa shall jointly
discuss and agree, based on the principles of this Section 13.4, on any
statement to the public regarding this Agreement or any aspect of this 



                                      -26-

<PAGE>   32

Agreement not covered by Section 13.5 below, subject in each case to disclosure
otherwise required by law or regulation, including, without limitation,
disclosure required by (i) order of a court, (ii) United States securities law
filings in connection with public offerings or periodic reporting requirements
or (iii) prosecution of patent applications. In such event, the disclosing party
shall promptly notify the non-disclosing party of such disclosure as soon as
practical after the disclosure. In the discussion and agreement referred to
above, the principles observed by GenQuest and Corixa shall be: accuracy, the
requirements for confidentiality under Article 10, the advantage a competitor of
GenQuest or Corixa may gain from any public statements under this Section 13.4,
the requirements of disclosure under any applicable securities laws, including
those associated with public offerings, and the standards and customs in the
pharmaceutical industry for such disclosures by companies comparable to GenQuest
and Corixa. The terms of this Agreement may also be disclosed to Third Parties
with the consent of the other party, which consent shall not be unreasonably
withheld so long as such disclosure is made for a legitimate business purpose
and under the same confidentiality restrictions as set forth in Section 10.1 of
this Agreement.

        13.5 Publications. Each party agrees that it shall not publish or
present the results of studies carried out as part of the Research without the
opportunity for prior review by the other party. Each party shall provide to the
other the opportunity to review any proposed abstracts, manuscripts or
presentations (including information to be presented orally) covering
information arising from the Research and not previously disclosed at least
thirty (30) days prior to their intended submission for publication and such
submitting party agrees, upon written request from the other party, not to
submit such abstract or manuscript for publication or to make such presentation
until the other party is given a reasonable period of time to secure patent
protection for any material in such publication or presentation which it
believes is patentable.

                                   ARTICLE 14
                   TERM AND TERMINATION; CERTAIN OPTION RIGHTS

        14.1 Term.

               (a) This Agreement shall commence as of the Effective Date and
shall continue in effect unless otherwise terminated in accordance with the
terms of this Article 14.

               (b) The Research Term shall have the duration set forth in
Section 1.42 of this Agreement and shall terminate in accordance therewith.

        14.2 Termination for Material Breach. If either party commits a Material
Breach of this Agreement at any time, the non-breaching party may elect to
terminate this Agreement at any time, as follows:



                                      -27-

<PAGE>   33
   
               (a) If Corixa elects to terminate under this Section 14.2, the
licenses to GenQuest set forth in Section 4.2(a), 4.2(b) and 4.2(c) shall, at
Corixa's option, immediately terminate and be of no further force or effect;
provided, however, that (i) the license under Section 4.2(b) with respect to
Corixa Gene Products invented and/or discovered during the Research shall remain
in full force and effect, and (ii) the license under Section 4.2(c) with respect
to Corixa Gene Discovery Methodologies invented and/or discovered during the
Research shall remain in full force and effect. No other license grants to
GenQuest under this Agreement shall be affected by termination under this
Section 14.2.
    

   
               (b) If GenQuest elects to terminate under this Section 14.2, (i)
the licenses to Corixa set forth in Section 4.1(a) and Section 4.1(b) shall, at
GenQuest's option, immediately terminate and be of no further force or effect,
and (ii) all licenses granted to GenQuest under this Agreement shall be expanded
beyond the GenQuest Exclusive Field and shall include exclusive rights in the
field of infectious disease, excluding all infectious disease Vaccines. No other
license grants to Corixa under this Agreement shall be affected by termination
under this Section 14.2.
    

   
               (c) In addition, upon the request of the non-breaching party, an
Arbitrator appointed in accordance with Section 15.5 shall have the authority,
after taking into account the circumstances leading to the Material Breach in
question, to reduce (but in no event increase) any royalty obligation payable to
the breaching party under this Agreement to an amount not lower than half the
royalty payable if the Material Breach had not occurred.
    

               (d) In the event that Corixa terminates under this Section 14.2
as a result of a Material Breach by GenQuest, GenQuest's remaining payment
obligations under Article 8 herein up to the date of termination shall become
immediately due and payable. Within thirty (30) days of such Material Breach,
GenQuest shall make a one-time lump sum cash payment to Corixa equal to such
amounts not previously paid to Corixa pursuant to Article 8. In the event that
GenQuest terminates under this Section 14.2 as a result of a Material Breach by
Corixa, GenQuest's obligations under Article 8 herein shall terminate.

               (e) Notwithstanding the foregoing, in the event a party disputes
the occurrence of a Material Breach, the other party's right to terminate this
Agreement under Section 14.2 above shall be stayed until it has been determined
in accordance with Section 15.5 below that such Material Breach in fact occurred
and the breaching party has failed to cure such breach within sixty (60) days
after such determination.

               (f) This Section 14.2 shall not be construed so as to limit the
remedies of either party with respect to breaches of this Agreement by the other
party of terms of this Agreement that do not constitute a Material Breach, nor
to limit any other remedies available to the parties under applicable law with
respect to such Material Breach.

        14.3 Termination for Bankruptcy. Either party may terminate this
Agreement with notice if the other party makes an assignment of substantially
all of its assets for the benefit of creditors, is the subject of proceedings in
voluntary or involuntary bankruptcy instituted on behalf of or against such
party, or has a receiver or trustee appointed for all or substantially all of
its property; provided that in the case of an involuntary bankruptcy proceeding
such right to 



                                      -28-

<PAGE>   34

terminate shall only become effective if the party consents to the involuntary
bankruptcy or such proceeding is not dismissed within one hundred eighty (180)
days after the filing thereof. The party terminating this Agreement under this
Section 14.3 may, at such party's option, terminate any license granted under
this Agreement to the other party which constitutes a sublicense under any
Existing Third Party Agreement.

        14.4 Termination by GenQuest. GenQuest shall have the right to terminate
the Research Term within thirty (30) days after December 31, 1997, if the
scientific objectives set forth in the Research Plan for the period ended
December 31, 1997 have not been met. Termination under this Section shall be
deemed to be a "Fundamental Change" under the Call Option Agreement.

        14.5 Termination by Corixa Corixa shall have the right to terminate the
Research Term within thirty (30) days after December 31, 1997, if the scientific
objectives set forth in the Research Plan for the period ended December 31, 1997
have not been met. Termination under this Section shall be deemed to be a
"Fundamental Change" under the Call Option Agreement.

        14.6 Surviving Rights. Except with respect to the survival of licenses
granted under Article 4 and Section 11.3, which shall survive as set forth in
Sections 14.2, 14.3, 14.4, 14.5 and 14.6, the obligations and rights of the
parties under Articles 6, 7, 8, 10, 11.1, 11.2, 11.4, 11.5, 11.6, 11.8, 12, 15
and 16, and Sections 13.2, 13.4 and 13.5 of this Agreement shall survive
termination. In addition, any sublicense granted to a Third Party pursuant to
this Agreement shall survive termination of this Agreement for any reason,
provided that the sublicensee thereunder agrees in writing to be bound by the
applicable provisions of Articles 6, 7, 10, 15 (other than Section 15.5) and 16,
and Sections 4.7, 11.6 and 13.2, of this Agreement.

        14.7 Accrued Rights, Surviving Obligations. Termination, relinquishment
or expiration of the Agreement for any reason shall be without prejudice to any
rights which shall have accrued to the benefit of either party prior to such
termination, relinquishment or expiration, including damages arising from any
breach hereunder. Such termination, relinquishment or expiration shall not
relieve either party from obligations which are expressly indicated to survive
termination or expiration of the Agreement.



                                      -29-

<PAGE>   35
        14.8 Certain Option Rights.

               (a) GenQuest hereby grants to Corixa an exclusive option (the
"Corixa Option"), exercisable at any time from the Effective Date until ninety
(90) days after the date one (1) year after termination of the Research Term to
acquire the license set forth in Section 4.1(b) hereof with respect to any
GenQuest Gene Products discovered or invented prior to the expiration of such
one (1) year period. For so long as such Corixa Option remains in effect, prior
to entering into negotiations with any Third Party with respect to a
collaboration covering any particular GenQuest Gene Product, GenQuest shall
notify Corixa of its intention to enter into such negotiations. The Corixa
Option with respect to such GenQuest Gene Product shall terminate thirty (30)
days after Corixa's receipt of such notice from GenQuest if not exercised by
Corixa prior to the expiration of such thirty (30) day period.

               (b) Corixa hereby grants to GenQuest an exclusive option (the
"GenQuest Option"), exercisable at any time from the Effective Date until ninety
(90) days after the date one (1) year after termination of the Research Term, to
acquire the license set forth in Section 4.2(b) hereof with respect to any
Corixa Gene Products discovered or invented prior to the expiration of such one
(1) year period. For so long as such GenQuest Option remains in effect, prior to
entering into negotiations with any Third Party with respect to a collaboration
covering any particular Corixa Gene Product, Corixa shall notify GenQuest of its
intention to enter into such negotiations. The GenQuest Option with respect to
such Corixa Gene Product shall terminate thirty (30) days after GenQuest's
receipt of such notice from Corixa if not exercised by GenQuest prior to the
expiration of such thirty (30) day period.

                                   ARTICLE 15
               INDEMNIFICATION AND LIMITATIONS; DISPUTE RESOLUTION

        15.1 Indemnification by Corixa. Corixa shall indemnify and hold GenQuest
harmless from and against any and all liability, damage, loss, cost (including
reasonable attorneys' fees) and expense resulting from any claim of bodily
injury or property damage (a) relating to the development, manufacture, use,
distribution or sale of any Product by Corixa, or (b) due to the negligence or
willful misconduct of Corixa or its employees or agents.

        15.2 Indemnification by GenQuest. GenQuest shall indemnify and hold
Corixa harmless from and against any and all liability, damage, loss, cost
(including reasonable attorneys' fees) and expense resulting from any claim of
bodily injury or property damage (a) relating to the development, manufacture,
use, distribution or sale of any Product by GenQuest or (b) due to the
negligence or willful misconduct of GenQuest or its employees or agents.

        15.3 LIMITED LIABILITY. NOTWITHSTANDING ANYTHING ELSE IN THIS AGREEMENT
OR OTHERWISE, NEITHER GENQUEST NOR CORIXA SHALL BE LIABLE WITH RESPECT TO ANY
SUBJECT MATTER OF THIS AGREEMENT UNDER ANY CONTRACT, NEGLIGENCE, STRICT
LIABILITY, OR OTHER LEGAL OR EQUITABLE THEORY FOR (i) ANY INCIDENTAL OR
CONSEQUENTIAL DAMAGES OR LOST PROFITS; OR (ii) COST OF PROCUREMENT OF SUBSTITUTE
GOODS, TECHNOLOGY, OR SERVICES. NEITHER GENQUEST NOR CORIXA SHALL HAVE 



                                      -30-

<PAGE>   36

ANY LIABILITY FOR ANY FAILURE OR DELAY DUE TO MATTERS BEYOND THEIR RESPECTIVE
REASONABLE CONTROL.

        15.4 WARRANTY DISCLAIMER. EXCEPT AS OTHERWISE EXPRESSLY PROVIDED IN THIS
AGREEMENT, NEITHER PARTY MAKES ANY WARRANTY WITH RESPECT TO ANY TECHNOLOGY,
GOODS, SERVICES, RIGHTS, OR OTHER SUBJECT MATTER OF THIS AGREEMENT AND HEREBY
DISCLAIMS WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
NON-INFRINGEMENT WITH RESPECT TO ALL OF THE FOREGOING.

        15.5 Dispute Resolution. No arbitration with reference to this Agreement
shall arise until the procedures set forth in this Section 15.5 have been
satisfied. In the event of any dispute with respect to the interpretation of any
provision of this Agreement or with respect to the performance of either party
under this Agreement, either party may at any time provide the other party
written notice specifying the terms of such disagreement in reasonable detail.
As soon as practicable after receipt of such notice, the Chairman of the Board
of Directors of GenQuest and the Chairman of the Board of Directors of Corixa
shall meet at a mutually agreed upon time and location for the purpose of
resolving such disagreement. They shall engage in discussions and/or
negotiations for a period of up to thirty (30) days in an effort to resolve the
disagreement or negotiate an interpretation or revision of the applicable
portion of this Agreement which is mutually agreeable to both parties, without
the necessity of formal procedures relating thereto. During the course of such
discussion and/or negotiation, the parties shall reasonably cooperate and
provide information that is not materially confidential in order so that each of
the parties may be fully informed with respect to the issues in dispute.

               The commencement of JAMS (as defined below) dispute resolution
procedures to resolve such disagreement may occur only after the earlier of: (a)
the mutual agreement of the Chairman of the Board of Directors of GenQuest and
the Chairman of the Board of Directors of Corixa that resolution of such
disagreement through continued negotiation is not likely to occur, or (b)
following expiration of the thirty (30) day negotiation period. Thereafter,
either party may seek to resolve such disagreement by initiating an Alternative
Dispute Resolution ("ADR") in which the Judicial Arbitration and Mediation
Services ("JAMS"), Seattle, Washington shall select the arbitrator
("Arbitrator") as provided herein. If JAMS is not in existence at the time of
such dispute the American Arbitration Association, Seattle, Washington shall be
substituted.

               (a) Selection of Arbitrator. An ADR shall be initiated by a party
by sending written notice thereof to the other party and JAMS, which notice
shall state the issues to be resolved. Within ten (10) business days after
receipt of such notice, the other party may, by sending written notice to the
initiating party and JAMS, add issues to be resolved. Within twenty (20)
business days after the date of the original ADR notice, JAMS shall nominate to
the parties at least five (5) qualified nominees from JAMS' panel. The parties
shall have five (5) business days after the receipt of such nominations to agree
on a Arbitrator or, failing to agree, to rank-order their preferences with the
most preferred being given the lowest number, and mail the rank-order to JAMS.
JAMS shall notify the parties of their selection. If all nominees are
unacceptable to a party, the procedure shall be repeated and, if the parties
cannot select an Arbitrator the second time, JAMS shall select the Arbitrator.



                                      -31-

<PAGE>   37

               (b) Arbitrator With Special Expertise. In the event of a dispute
between the parties relating to the calculation of any royalties or the amount
of other consideration payable under this Agreement, then, in addition to the
procedure set forth in the previous subsection, the Arbitrator shall (i) be a
partner or full member of an internationally recognized certified public
accounting firm which is not an auditing firm for either party and has not
provided material services to either party during the last two (2) year period
prior to the date of ADR initiation and (ii) have a meaningful biotechnology
science and industry background.

               (c) ADR Hearing. The Arbitrator shall hold a hearing to resolve
the issues within sixty (60) business days after selection. The location of the
hearing shall be Seattle, Washington. Each party may be represented by counsel.
The Arbitrator shall have sole discretion regarding the admissibility of
evidence and conduct of the hearing. At least five (5) business days prior to
the hearing, each party shall submit to the other party and the Arbitrator a
copy of all exhibits on which such party intends to rely at the hearing, a
pre-hearing brief (up to thirty (30) pages) and a proposed disposition of the
dispute (up to five (5) pages). The proposed disposition shall be limited to
proposed rulings and remedies on each issue, and shall contain no argument on or
analysis of the facts or issues; provided, however, that the parties shall not
present proposed monetary remedies. Within five (5) business days after close of
the hearing, each party may submit a post-hearing brief (up to five (5) pages)
to the Arbitrator.

               (d) ADR Ruling: Fees and Expenses. The Arbitrator shall render a
disposition on the proposed rulings as expeditiously as possible after the
hearing, but not later than fifteen (15) business days after the conclusion of
the hearing. The Arbitrator shall rule on each issue and shall adopt in its
entirety the proposed ruling of one of the parties on each issue. In the
circumstance where the Arbitrator rules for a party on a claim in the form of a
claim for monetary damages, the parties shall then submit a proposed remedy
within ten (10) days of notice of the ruling. The proposed remedy may be
accompanied by a brief in support of the remedy not to exceed five (5) pages.
The Arbitrator shall rule on and adopt one of the proposed remedies within ten
(10) days of their submission. The Arbitrator's disposition shall be final and
not appealable, except that either party shall have the right to appeal such
disposition on the basis it was affected by fraud or bad faith in connection
with the ADR proceedings. The reasonable fees and expenses of the Arbitrator, as
well as the standard charges of JAMS for its assistance, shall be borne by the
parties as determined by the Arbitrator, who shall, in making such
determination, take into account the equities and disposition of the
proceedings. A judgment on the Arbitrator's disposition may be entered in and
enforced by any court having jurisdiction over the parties.

               (e) JAMS Rules. Except as otherwise provided in this Section
15.5, JAMS Rules shall be used in connection with the ADR.

               (f) Notwithstanding anything to the contrary in this Section
15.5, either Corixa or GenQuest may, on good cause shown in the event such party
reasonably believes that it otherwise will suffer irreparable injury, seek a
temporary restraining order and/or preliminary injunction from a court of
competent jurisdiction, to be effective pending the institution of the
arbitration process and the deliberation and award of the Arbitrator.



                                      -32-

<PAGE>   38

                                   ARTICLE 16
                                  MISCELLANEOUS

   
        16.1 Assignment to Non-Affiliates: Sale or Merger. Neither party may
assign its rights or obligations under this Agreement except as expressly
provided elsewhere in this Agreement or in accordance with the remainder of this
paragraph. Either party may assign its rights or obligations under this
Agreement in connection with the sale of all or substantially all of the
assigning party's related business. This Agreement shall survive any merger of
either party with or into another party and no consent shall be required
hereunder; provided, that in the event of such merger, no intellectual property
rights of the Third Party that is a party to the merger or its Affiliate shall
be included in the GenQuest Technology or the Corixa Technology, as applicable,
to the extent that such intellectual property rights were Controlled by the
Third Party or its Affiliate prior to the merger, or are created outside the
Research Plan by personnel who were not employees of GenQuest or Corixa,
respectively, prior to the merger.  Following the Put Option Expiration under
the Put/Call Agreement after an assignment of this Agreement by Corixa,
GenQuest may upon notice to Corixa terminate the Research Term, in which case
the Research Term shall be deemed to end for all purposes of this Agreement
upon Corixa's receipt of such notice.
    
        16.2 Force Majeure. Neither party shall lose any rights hereunder or be
liable to the other party for damages or losses on account of failure of
performance by the defaulting party if the failure is occasioned by government
action, war, fire, earthquake, explosion, flood, strike, lockout, embargo, act
of God, or any other similar cause beyond the control of the defaulting party,
provided that the party claiming force majeure has exerted all reasonable
efforts to avoid or remedy such force majeure; provided further, however, in no
event shall a party be required to settle any labor dispute or disturbance.

        16.3 Further Actions. Each party agrees to execute, acknowledge and
deliver such further instruments, and to do all such other acts, as may be
necessary or appropriate in order to carry out the purposes and intent of this
Agreement.

        16.4 No Trademark Rights. Except as otherwise provided herein, no right,
express or implied, is granted by the Agreement to use in any manner the name
"GenQuest" or "Corixa" or any other trade name or trademark of the other party
in connection with the performance of this Agreement, and no tradename or
trademark of either party may be used in any form by the other party or such
party's Affiliates or sublicensees without prior written consent.

        16.5 Notices. All notices and other communications hereunder shall be in
writing and shall be deemed given if delivered (i) personally, (ii) by facsimile
transmission (receipt verified), (iii) by registered or certified mail (return
receipt requested), postage prepaid, or (iv) sent by express courier service
(receipt verified), to the parties at the following addresses (or at such other
address for a party as shall be specified by like notice; provided, that notices
of a change of address shall be effective only upon receipt thereof):

               If to GenQuest, addressed to:

               GenQuest, Inc.



                                      -33-

<PAGE>   39

               c/o Frazier & Company
               601 Union Street
               Two Union Square, Suite 2110
               Seattle, WA  98101
               Attention:  Alan Frazier
               Telephone:  (206) 621-7200
               Facsimile:  (206) 621-1848

               If to Corixa, addressed to:

               Corixa Corporation.
               1124 Columbia St.
               Suite 464
               Seattle, WA  98104
               Attention:  Chief Operating Officer
                           Corporate Counsel
               Telephone:  (206) 667-5711
               Telecopy:   (206) 667-5715

               With Copies to:

               Venture Law Group
               4750 Carillon Point
               Kirkland, WA 98033
               Attention:  William W. Ericson
               Telephone:  (206) 739-8700
               Facsimile:  (206) 739-8750

               Wilson Sonsini Goodrich & Rosati
               650 Page Mill Road
               Palo Alto, CA 94304-1050
               Attention:  Kenneth Clark
               Telephone:  (415)  493-9300
               Facsimile:  (415) 493-6811

               Rosner Bresler Goodman & Bucholz
               521 5th Avenue
               New York, NY 10175
               Attention:  Andrew J. Goodman
               Telephone:  (212) 661-2150
               Facsimile:  (212) 949-6131

        16.6 Governing Law. This Agreement shall be governed by the laws of the
State of Washington as such laws are applied to contracts entered into and to be
performed within such state notwithstanding the provisions governing conflict of
laws under such laws to the contrary. The parties hereby submit to the exclusive
jurisdiction of the United States District Court for the Western District of
Washington.



                                      -34-

<PAGE>   40

        16.7 Waiver. All waivers must be in writing signed by authorized
representatives of both parties. Except as specifically provided for herein, the
waiver from time to time by either of the parties of any of their rights or
their failure to exercise any remedy shall not operate or be construed as a
continuing waiver of same or of any other of such party's rights or remedies
provided in this Agreement.

        16.8 Severability. If any term, covenant or condition of this Agreement
or the application thereof to any party or circumstance shall, to any extent, be
held to be invalid or unenforceable, then (i) the remainder of this Agreement,
or the application of such term, covenant or condition to parties or
circumstances other than those as to which it is held invalid or unenforceable,
shall not be affected thereby and each term, covenant or condition of this
Agreement shall be valid and be enforced to the fullest extent permitted by law;
and (ii) the parties hereto covenant and agree to renegotiate for a period of
ninety (90) days after such provision is held to be invalid or unenforceable,
any such term, covenant or application thereof in good faith in order to provide
a reasonably acceptable alternative to the term, covenant or condition of this
Agreement or the application thereof that is invalid or unenforceable, it being
the intent of the parties that the basic purposes of this Agreement are to be
effectuated.

        16.9 Entire Agreement. This Agreement sets forth all the covenants,
promises, agreements, warranties, representations, conditions and understandings
between the parties hereto and supersedes and terminates all prior agreements
and understandings between the parties. There are no covenants, promises,
agreements, warranties, representations, conditions or understandings, either
oral or written, between the parties other than as set forth herein and therein.
No subsequent alteration, amendment, change or addition to this Agreement shall
be binding upon the parties hereto unless reduced to writing and signed by the
respective authorized officers of the parties.

        16.10 Certain Legal Fees. The parties will share legal expenses incurred
in connection with the drafting and negotiation of this Agreement in a manner to
be determined in good faith by the parties within a reasonable time after the
Execution Date.

   
        16.11 Waiver of Conflicts.  Each party to this Agreement acknowledges
that Venture Law Group ("VLG") is general corporate counsel for Corixa and has
represented Corixa with respect to the negotiations of, and the transactions
contemplated by, this Agreement, the Administrative Services Agreement and the
Call Option Agreement, and that VLG has in the past performed and may continue
to perform legal services for certain investors in GenQuest (the "Investor")
and for GenQuest in matters unrelated to the transactions described in this
Agreement, including the representation of certain Investors in venture capital
financings and other matters and the representation of GenQuest in certain
transactions and general corporate matters.  In addition, VLG has been
requested to, and has agreed to, provide a legal opinion with respect to
certain legal matters regarding the transactions contemplated by GenQuest's
Series B Preferred Stock Purchase Agreement dated as of the date hereof (the
"Opinion").  Accordingly, each party to this Agreement hereby (a) acknowledges
that they have had an opportunity to ask for information relevant to this
disclosure, and (b) gives its informed written consent to (i) VLG's general
corporate representation of Corixa, (ii) VLG's representation of certain of the
Investors in such unrelated matters, (iii) VLG's representation of GenQuest with
respect to the negotiation of, and the transactions contemplated by, GenQuest's
Series B Preferred Stock Purchase Agreement dated as of the date hereof,
GenQuest's Amended and Restated Investor's Rights Agreement dated as of the date
hereof, GenQuest's Second Amended and Restated Certificate of Incorporation and
the Amendment and Termination Agreement dated as of the date hereof, (iv) VLG's
provision of the Opinion and the representation of GenQuest in certain unrelated
transactions and general corporate matters, (v) VLG's representation of Corixa
with respect to the negotiation of,
    

                                      -35-

<PAGE>   41
   
and the transactions contemplated by, this Agreement, the Administrative
Services Agreement, the Put/Call Agreement and GenQuest's Amended and Restated
Voting Agreement dated as of the date hereof, and (vi) VLG's provision of
services for GenQuest through GenQuest's relationship with Corixa, as set forth
in this Agreement, the Administrative Services Agreement and the Put/Call
Agreement. Each party to this Agreement further acknowledges that it has had
the opportunity to confer with legal counsel of its choice in connection with
the transactions contemplated hereby.
    

                                      -36-

<PAGE>   42
               IN WITNESS WHEREOF, the parties have executed this Amended and
Restated License and Research Collaboration Agreement in duplicate originals by
their proper officers as of the date and year first above written.


GENQUEST, INC.


By: /s/ IVOR ROYSTON
    --------------------------------
    Ivor Royston
    Chairman of the Board of Directors


CORIXA CORPORATION


By: /s/ STEVEN GILLIS
    --------------------------------
    Steven Gillis
    President and Chief Executive Officer



<PAGE>   43
                                    Exhibit A

                   AMENDED AND RESTATED CALL OPTION AGREEMENT


                        See Exhibit 10.24 filed herewith


<PAGE>   44
                        Exhibit 4.4(a)

                To the Amended and Restated License and
                   Research Collaboration Agreement

                   EXISITING THIRD PARTY TECHNOLOGY

1.      License Agreement, dated as of November 11, 1994, between University of 
        Pittsburgh of the Commonwealth System of Higher Education and Corixa
        Corporation.

2.      Exclusive License Agreement, dated as of June 12, 1995, between the 
        University of Washington and Croixa Corporation.

3.      Exclusive License Agreement, dated as of June 12, 1995, between the 
        Washington Research Foundation and Corixa Corporation.

4.      License Agreement, dated as of November 20, 1995, between Health 
        Research, Inc. and Corixa Corporation.

5.      Agreement for Collaborative Research with Commercial Sponsers, dated as
        of March 1, 1995, between Health Research, Inc. and Corixa Corporation.

6.      Research Agreement, dated as of November 11, 1994, between the
        University of Pittsburgh of the Commonwealth System of Higher
        Education, as amended March 8, 1995.

<PAGE>   1
                                                                EXHIBIT 10.24

                   AMENDED AND RESTATED CALL OPTION AGREEMENT


         THIS AMENDED AND RESTATED CALL OPTION AGREEMENT (this "Agreement") is
made and entered into this 23rd day of December, 1996 (the "Effective Date") by
and among Corixa Corporation, a Delaware corporation ("Corixa"), GenQuest, Inc.,
a Delaware corporation (the "Company") and the holders of Securities (as defined
below) set forth on the attached Exhibit A (the "Securityholders").

         WHEREAS, Corixa, the Company and the Securityholders are parties to
that certain Call Option Agreement dated December 23, 1996 (the "Prior Call
Option Agreement") pursuant to which Corixa has the right in the future to
purchase in a single transaction all of the outstanding Securities of the
Company not then owned by Corixa.

         WHEREAS, Corixa, the Company and the Securityholders each desire to
terminate the Prior Call Option Agreement in its entirety and accept the rights
and obligations created pursuant hereto in lieu of the rights and obligations
created under the Prior Call Option Agreement.

         NOW, THEREFORE, in consideration of the mutual covenants and promises
herein contained, the parties hereto agree as follows:

                                    EXHIBITS

         The Exhibits to this Agreement, which are incorporated herein by
reference are:

      Exhibit A    -       Schedule of Securities owned by each Securityholder
      Exhibit B    -       Call Option Exercise Notice

        1.      Definitions

                "Affiliate" of any particular person or entity means any other
person or entity that, directly or indirectly, through one or more
intermediaries, controls, is controlled by or is under common control with such
particular person or entity. For the purposes of this definition, control means
the direct or indirect ownership of (a) at least fifty percent (50%) or, if less
than fifty percent (50%), the maximum percentage as allowed by applicable law,
of the outstanding voting securities of such entity or (b) at least fifty
percent (50%) of the decision making authority of such entity; provided,
however, that neither Corixa nor the Company shall be deemed to be an Affiliate
of the other for purposes of this Agreement.

                "Call Option" means the option to purchase Securities granted to
Corixa by the Securityholders pursuant to Section 2 of this Agreement.

                "Call Option Exercise Date" means the date Corixa gives notice
of its election to exercise the Call Option.
<PAGE>   2

                "Call Option Expiration" means the earlier of (a) the expiration
of the Call Option at the end of the Call Option Period without the Call Option
having been exercised by Corixa and thereafter consummated (b) the date on which
Corixa notifies the Company's Board of Directors in writing that it does not
intend to exercise its Call Option, (c) ten (10) days following a Fundamental
Change or (d) the closing of an initial public offering of the Common Stock of
the Company made pursuant to a registration statement filed under the Securities
Act of 1933, as amended (the "Act").

                "Call Option Period" means the period beginning on the Effective
Date and ending on the earlier of January 23, 2000 or the Call Option
Expiration.

                "Call Option Purchase Date" means the date determined pursuant
to Section 2(b) of this Agreement.

                                                                                
                "Call Option Record Date" means the date which is twenty (20)
days following the Call Option Exercise Date.

                "Call Purchase Price" shall have the meaning set forth in
Section 2(c) of this Agreement.

                "Corixa Call Share Value" means the value of a Corixa Share
determined in accordance with the following formula:

                The greater of (i) (FMV - Base Price)
                                   ------------------ + Base Price, and (ii)
                                          2
FMVA 0.7 where FMV is equal to:

         (1)     If the Common Stock of Corixa is traded on a National Exchange,
then FMV shall equal the average closing sale price of a share of Corixa
Common Stock as reported on the National Exchange for each of the thirty (30)
trading days immediately preceding the Call Option Exercise Date.

        (2)     If the Common Stock of Corixa is not traded on a National
Exchange, then FMV shall equal (x) the effective price per share (subject to
appropriate adjustments for stock splits, stock dividends, recapitalizations,
reorganizations and combinations) of the Common Stock equivalent issued in the
Qualifying Private Placement, or if there has been a Corporate Partner Financing
(y) the mean of (A) the effective price per share (subject to appropriate
adjustments for stock splits, stock dividends, recapitalizations,
reorganizations and combinations) of the Common Stock equivalent issued in the
Qualifying Private Placement and (B) the effective price per share (subject to
appropriate adjustments for stock splits, stock dividends, recapitalizations,
reorganizations and combinations) of the Common Stock equivalent issued in such
Corporate Partner Financing

                and where the Base Price is initially equal to
$3.00. The initial Base Price shall be reduced to $2.50 in the event Corixa does
not enter into a major strategic collaboration with respect to the development
of a counter vaccine 



                                      -2-
<PAGE>   3

[***] on or before June 30, 1997 and shall be subject to adjustment from time to
time as provided in Section 2(e)(iii) below and for stock splits, stock
dividends, recapitalizations, reorganizations and combinations.

                  "Corixa IPO" means the closing of an initial public offering
of the Common Stock of Corixa made pursuant to a registration statement filed
under the Act.

                  "Corporate Partner Financing" means the most recent investment
actually made in Corixa of at least $2,500,000 by a pharmaceutical (or
biotechnology) company with either (a) annual revenues of at least $750 million
in such company's last fiscal year or (b) a market capitalization of at least
$750 million at the end of such company's last fiscal year; provided that such
pharmaceutical (or biotechnology) company has also entered into a strategic
collaboration with Corixa; and provided further that such investment occurs
subsequent to the Qualifying Private Placement.

                  "Corixa Shares" means shares of Common Stock of Corixa issued
to the Securityholders in payment of the Purchase Price.

                  "Fundamental Change" means (a) a merger or reorganization of
Corixa with or into any other corporation (other than the Company) or
corporations pursuant to which Corixa's stockholders immediately prior to such
transaction own, immediately after such transaction, less than fifty percent
(50%) of the equity securities of the surviving corporation or its parent, (b) a
sale of all or substantially all of the assets or outstanding stock of Corixa
pursuant to which transaction Corixa's stockholders immediately prior to such
transaction own, immediately after such transaction, less than fifty percent
(50%) of the equity securities of the surviving corporation or its parent or (c)
the termination of that certain Amended and Restated License and Research
Collaboration Agreement between Corixa and the Company dated December 23, 1996,
as amended on January 1, 1997 pursuant to Sections 14.4 or 14.5 thereof;
provided, however, that in no event will a Corixa IPO or any subsequent public
offering of Common Stock of Corixa made pursuant to a registration statement
filed under the Act be deemed to be a Fundamental Change.

                  "Major Strategic Collaboration" means a collaboration with a
pharmaceutical (or biotechnology) company in which Corixa receives a
non-cancelable commitment (except in the event of a breach by Corixa or such
pharmaceutical or biotechnology company) to receive an aggregate of at least $6
million of license and/or research funding and contingent milestone payments of
at least $8 million based on the development of resulting cancer vaccine
products.

                  "National Exchange" means the New York Stock Exchange, the
American Stock Exchange or a European counterpart thereof, or any national
market system, including without limitation the Nasdaq National Market.

                  "Qualifying Private Placement" means the most recent equity
financing by Corixa pursuant to which Corixa receives at least $5,000,000 of
funding and in which at least forty percent (40%) of the invested amount is from
investors that are not pharmaceutical (or

                                      -3-
<PAGE>   4

biotechnology) companies (or Affiliates thereof) and that have not previously
invested in Corixa and have not entered into a collaboration or contractual
arrangement with Corixa; provided, however, that the equity financing wherein
S.R. One, Limited purchased shares of Series B Preferred Stock of Corixa at
$3.00 per share (the "SR One Price") on May 10, 1996 is deemed to be a
Qualifying Private Placement; and provided further, however, that the S.R. One
Price will be reduced to $2.50 per share in the event Corixa does not enter
into Major Strategic Collaboration with respect to the development of a cancer
vaccine on or before June 30, 1997.

                "Securityholders" means all holders of Securities set forth on
Exhibit A, other than Corixa.

                "Securities" means (a) all shares of Common Stock issued or
issuable upon conversion of all shares of the Company's Series A and Series B
Preferred Stock purchased directly from the Company or acquired pursuant to a
transfer in accordance with Section 3(b) hereof and (b) all shares of the
Company's Common Stock purchased directly from the Company or acquired pursuant
to a transfer in accordance with Section 3(b) hereof.

                "Series A/Common Call Purchase Price" shall have the meaning set
forth in Section 2(c)(ii) of this Agreement.

                "Series B Call Purchase Price" shall have the meaning set forth
in Section 2(c)(i) of this Agreement.

                "Series B Securityholders" means all holders of Securities
constituting shares of the Company's Series B Preferred Stock.

                Pronouns: When used herein, the pronoun "his" shall mean his,
her or its, as appropriate and "him" and "he" have corresponding meanings.

        2.      Call Option

                (a)     Grant of Call Option

                        (i)     General. All Securities beneficially owned by
each Securityholder on the date of this Agreement (as shown on Exhibit A
hereto), and all Securities that each Securityholder may beneficially own at any
time hereafter up and until the Call Option Record Date or the Call Option
Expiration, as applicable, shall be subject to the terms of this Agreement.

                        (ii)    Call Option. Each Securityholder hereby grants
to Corixa an exclusive right to purchase at any time during the Call Option
Period all Securities he beneficially owns on the Call Option Purchase Date and,
upon exercise of the Call Option by Corixa, each Securityholder shall sell to
Corixa all such Securities on the terms described below. The exercise of the
Call Option shall be structured as a stock-for-stock exchange, or as a statutory
merger of the Company with Corixa, and is intended to qualify as a tax free
reorganization as contemplated by Section 368 of the Internal Revenue Code (the
"Code").

                                      -4-
<PAGE>   5

                (b)     Exercise of Call Option; Purchase Date

                        (i)     Corixa may exercise the Call Option by giving
notice, in substantially the form attached hereto as Exhibit B, to the Company
and each of the Securityholders at any time during the Call Option Period;
provided, however, that Corixa may not exercise the Call Option prior to June
23, 1998 unless there has been a Corixa IPO or Fundamental Change, and in the
case of a Corixa IPO the average closing sale price of a share of Corixa Common
Stock as reported on the National Exchange on which Corixa Common Stock is then
trading for each of the thirty (30) trading days immediately preceding the Call
Option Exercise Date is at least $6.00 (subject to appropriate adjustments for
stock splits, stock dividends, recapitalizations, reorganizations and
combinations).

                        (ii)    The purchase by Corixa of the Securities shall
take place on the date (the "Call Option Purchase Date") that is as soon as
practicable following issuance of a permit to qualify the issuance of the Corixa
Shares by the California Commissioner of Corporations (a "Permit") after the
conclusion of a hearing to consider the fairness of the terms and conditions of
the Call Option (a "Fairness Hearing"); provided, however, in the event such a
Fairness Hearing and Permit is not practicable in light of then-effective
federal and/or state securities laws, a Fairness Hearing shall not be held and
instead Corixa, at its expense, will grant the Securityholders the same
registration rights granted to investors in Corixa in the Qualifying Private
Placement; provided that such registration rights are at least as favorable as
the registration rights granted to investors in Corixa in the Amended and
Restated Investors' Rights Agreement by and among Corixa and the parties listed
on the schedules thereto in effect as of December 23, 1996 (the "Corixa Rights
Agreement"). In the event a Fairness Hearing is held, Corixa, the Company and
each Securityholder shall use its best commercial efforts to obtain the issuance
of a Permit, and all costs and expenses incurred by each party in connection
with such Fairness Hearing and the issuance of such Permit shall be borne by
such party, provided that Corixa shall reimburse the reasonable fees of one (1)
special counsel to the Securityholders, not to exceed $40,000. In the event a
Fairness Hearing is not held or a Permit qualifying the issuance of the Corixa
Shares is not issued, the Call Option Purchase Date shall be the date selected
by Corixa, which shall be not less than thirty (30) nor more than forty-five
(45) days after the Call Option Exercise Date.

                        (iii)   Corixa may purchase all, but not less than all,
of the Securities beneficially owned by the Securityholders which are
outstanding on the Call Option Record Date. For purposes of determining the
number and owners of Securities, the Company shall, within five (5) days
following the Call Option Record Date, certify in writing to Corixa the number
of Securities owned of record or beneficially by each Securityholder and the
address of each Securityholder, and Corixa may rely upon such written
certification. Upon exercise of the Call Option, the Company and each
Securityholder is obligated to comply in all respects with the terms of this
Agreement, and the Series B Securityholders will each use their reasonable best
efforts to insure that all other Securityholders have so complied; provided,
however, that the Series B Securityholders will not be required to incur any
material expense or economic disadvantage or to initiate any legal action in
order to insure such compliance.

                                      -5-
<PAGE>   6

                        (iv)    In the event of a Fundamental Change, the Call
Option granted pursuant to this Section 2 will terminate on the date which is
ten (10) days after the Fundamental Change.

                (c)     Call Purchase Price

                        (i)     Series B Call Purchase Price. As of the
Effective Date, the Series B Call Purchase Price shall be $1.00 per share of
Series B Preferred Stock. The Series B Call Purchase Price shall increase by
$0.04167 on the last day of each full calendar month following the month in
which the Effective Date occurs until the Call Option Exercise Date, up to a
maximum Series B Call Purchase Price of $2.00 per share of Series B Preferred
Stock.

                        (ii)    Series A/Common Call Purchase Price. The Series
A/Common Call Purchase Price per share for each share of the Company's Common
Stock and Series A Preferred Stock outstanding as of the Call Option Exercise
Date shall be equal to sixty-six and two-thirds percent (66-2/3%) of the
Series B Call Purchase Price determined pursuant to Section 2(c)(i).

                (d)     Delivery of Securities; Payment of Call Purchase Price;
Fractional Shares. On the Call Option Purchase Date, each Securityholder shall
deliver all Securities beneficially owned by such Securityholder duly endorsed
for transfer to Corixa and free and clear of any imperfections of title, lien,
claim, encumbrance, restriction or charge. Also on the Call Option Purchase
Date, subject to receipt of certificates representing the Securities
beneficially owned by each Securityholder in the form described in the preceding
sentence, Corixa shall deliver to each Securityholder that number of Corixa
Shares having an aggregate Corixa Call Share Value equal to (i) the Series B
Call Purchase Price multiplied by the number of outstanding shares of Series B
Preferred Stock held by such Securityholder on the Call Option Record Date and
(ii) the Series A/Common Call Purchase Price multiplied by the number of
outstanding shares of Common Stock and Series A Preferred Stock held by such
Securityholder on the Call Option Record Date. No fraction of a Corixa Share
will be issued as a result of the exercise of the Call Option. In lieu thereof,
Corixa will make a cash payment equal to the FMV of such fractional Corixa
Share, which FMV will be determined as provided in Section 1 hereof.

                (e)     Call Option Covenants. Corixa, the Company and each
Securityholder covenants and agrees as follows:

                        (i)     Qualification of Corixa Shares; Registration
Rights. Solely for the purpose of accommodating the request of the
Securityholders that the Corixa Shares to be issued pursuant to the exercise of
the Call Option qualify for the benefits of Section 3(a)(10) of the Act, prior
to or promptly following the exercise of the Call Option, Corixa will use its
best commercial efforts to file an application with the California Department of
Corporations (the "Department") for the issuance of a Permit and request that
the Department conduct a Fairness Hearing with respect thereto; provided,
however, that in the event such a Fairness Hearing and Permit is not practicable
in light of then-effective federal and/or state securities laws, a Fairness
Hearing shall not be held. In the event a Fairness Hearing is held, Corixa, the
Company and each

                                      -6-
<PAGE>   7

Securityholder shall use its best commercial efforts to cause such Fairness
Hearing to be held as soon as practicable following such request to the
Department and to obtain the issuance of the Permit; provided, however, that all
costs and expenses incurred by each party in connection with such Fairness
Hearing and such Permit shall be borne by such party, provided that Corixa shall
reimburse the reasonable fees of one (1) special counsel to the Securityholders,
not to exceed $40,000. In the event a Fairness Hearing is not held or the Corixa
Shares issued pursuant to the exercise of the Call Option do not qualify for the
benefits of Section 3(a)(10) of the Act, Corixa, at its expense, will grant the
Securityholders the same registration rights granted by Corixa to investors in
the Qualifying Private Placement, provided that such registration rights are at
least as favorable as the registration rights granted to investors in Corixa in
the Corixa Rights Agreement.

                        (ii)    Tax-Free Treatment; "Pooling-of-Interests"
Treatment. Corixa, the Company and each Securityholder will not take any action
that would prevent the exercise of the Call Option from qualifying as a tax free
reorganization within the meaning of either Section 368(a)(1)(A) or (B) of the
Code. If Corixa determines, in its sole reasonable judgment, that it is in the
best interests of Corixa, the Company and the Securityholders to structure the
exercise of the Call Option in such a manner that it qualifies for
pooling-of-interests accounting treatment, then Corixa, the Company and each
Securityholder will use its commercially reasonable efforts to structure the
exercise of the Call Option in such a manner, provided that such structure will
not result in a material adverse economic effect on the Securityholders.

                        (iii)   Antidilution Protection. The Base Price used in
calculating the Corixa Call Share Value will be subject to the same antidilution
protection as shares of Corixa's Series B Preferred Stock, as set forth in
Section 4(j) of Article IV(C) of the Amended and Restated Certificate of
Incorporation of Corixa filed with the Delaware Secretary of State on May 10,
1996 ("the Corixa Certificate"); provided, however, that in the event the Base
Price has been reduced to $2.50 because Corixa did not enter into a Major
Strategic Collaboration with respect to the development of a cancer vaccine on
or before June 30, 1997, then such antidilution protection shall not be
triggered unless there is a Dilutive Issuance (as defined in the Corixa
Certificate) with an Effective Price (as defined in the Corixa Certificate) of
less than $2.50 per share; and provided further that such antidilution
protection shall terminate with respect to any issuances of shares in or
following a Corixa IPO.

                (f)   Subsequent Adjustment Upon Corixa IPO. If within nine (9)
months following the Call Option Purchase Date there is a Corixa IPO in which
the initial public offering price (the "IPO Price") is less than the FMV upon
which the Call Purchase Price was based, then Corixa shall issue to each Series
B Securityholder and each Securityholder holding shares of the Company's Series
A Preferred Stock additional Corixa Shares sufficient to give such
Securityholder the equivalent economic benefit (the "Supplemental Antidilutive
Shares") as if the FMV used in calculating the Corixa Call Share Value was
equal to the IPO Price; provided, however, that in no event shall the issuance
of the Supplemental Antidilutive Shares have the effect of reducing the FMV
below $2.50.

                                      -7-
<PAGE>   8

        3.      Legend; No Transfer

                (a)     Legend. Until the Call Option Expiration, the
certificates representing the Securities held by the Securityholders shall have
endorsed thereon the following legend:

                "The securities represented by this certificate are subject to
                purchase by Corixa Corporation in accordance with the terms of a
                Call Option Agreement dated December 23, 1996 by and among the
                Company, Corixa Corporation, and the securityholders of the
                Company listed on Exhibit A attached thereto, as may be amended
                from time to time, a copy of which is on file with the Secretary
                of the Company."

                The Company hereby covenants to place a stop transfer order
against the Securities held by the Securityholders, and each Securityholder
hereby irrevocably authorizes the Company to do so.

                (b)     No Transfer. Prior to the Call Option Expiration and
except for sales to Corixa, no Securityholder shall alienate, sell, give,
transfer, assign, bequeath, pledge or hypothecate any Securities beneficially
owned by him or create or permit to exist any lien thereon or security interest
therein, other than by will or intestacy. Any attempted transfer or other act in
violation of this Section 3(b) shall be of no effect and the attempted
transferee or other party shall receive no rights in the Securities or under
this Agreement. The Company agrees that it will not transfer any Securities held
by the Securityholders on the stock transfer records of the Company.
Notwithstanding the foregoing, any Securityholder may transfer Securities upon
notice to Corixa, provided such transferee agrees in writing to be deemed a
"Securityholder" for all purposes of this Agreement and to be bound by all the
terms and conditions of this Agreement, and Corixa may require any documentation
of such transfer as it reasonably deems appropriate.

   
        4.      Spin-Out of the Company. If the Call Option is exercised
pursuant to the terms hereof and within twelve (12) months following the Call
Option Purchase Date, a Corixa IPO has not occurred and Corixa consummates the
sale of the Securities it obtained pursuant to the exercise of the Call Option,
through a public offering of such Securities (a "Spin-Out Offering"), then the
Securityholders and Corixa shall be reconstituted as stockholders of the Company
effective immediately prior to the consummation of such Spin-Out Offering,
provided that such reconstitution will not result in a material adverse economic
effect on the Securityholders. In this event, the Securityholders, as
stockholders of the Company, shall have the same rights, preferences and
privileges and be subject to the same restrictions as existed immediately prior
to the Call Option Purchase Date.
    

        5.      New Securityholders

                (a)     Preferred Stock. In the event that the Company issues
additional shares of any series of Preferred Stock (whether now existing or
hereafter authorized or designated) after the Effective Date and prior to the
Call Option Record Date ("New Preferred"), the Company 

                                      -8-
<PAGE>   9

shall use its reasonable best efforts to insure that each person or entity that
is issued such New Preferred (each a "New Preferred Securityholder") becomes a
party to this Agreement by amendment hereof or by executing a counterpart
signature page hereto. The Company, Corixa and the Securityholders hereby agree
that each such New Preferred Securityholder shall receive (i) the same effective
rate of return as received by the Series B Securityholders under Section 2
hereof and (ii) with respect to all other rights granted to Securityholders
under this Agreement, the same rights as received by the Series B
Securityholders.

                (b)     Common Stock. In the event that the Company issues
additional shares of its Common Stock ("New Common") after the Effective Date
and prior to the Call Option Record Date, the Company shall, at Corixa's
request, use its reasonable best efforts to insure that each person or entity
that is issued such New Common (each a "New Common Securityholder") becomes a
party to this Agreement by amendment hereof or by executing a counterpart
signature page hereto. The Company, Corixa and the Securityholders hereby agree
that each such New Common Securityholder shall be deemed to be a Securityholder
that beneficially owns shares of the Company's Common Stock for all purposes of
this Agreement.

        6.      Adjustments. With respect to any provision of this Agreement
that is subject to appropriate adjustments for stock splits, stock dividends,
recapitalizations, reorganizations and combinations, it is the intent of the
Company, Corixa and each Securityholder that no such adjustment shall result in
an increase or decrease in the aggregate value to be received by the
Securityholders in the form of Corixa Shares to be issued in exchange for the
Securities on the Call Option Purchase Date.

        7.      Representations and Warranties

                (a)     Representations of Securityholders. Each Securityholder
represents and warrants to Corixa and the Company that the information on
Exhibit A with respect to such Securityholder is true and correct as of the date
hereof and the representations in this Section 7(a) below are true and correct
as of the date hereof and will be true and correct as of the Call Option
Purchase Date. Each Securityholder shall take no action, or permit any action to
be taken, which would cause any of the representations in this Section 7 not to
be true and correct on the Call Option Purchase Date, and each Securityholder
will use its best commercial efforts to not take any action that will prevent
such Securityholder from carrying out its obligations under this Agreement. This
Agreement and the grant of the Call Option by each Securityholder to Corixa
constitutes the valid obligation of the Securityholder and is legally binding on
him in accordance with its terms. Each Securityholder has all requisite power to
enter into this Agreement and to carry out and perform his obligations
hereunder. The execution, delivery and performance of this Agreement will not
conflict with, or result in the breach of, any decree or order of any court,
administrative or governmental body or any agreement, document, indenture or
other instrument to which the Securityholder is a party or by which he or his
property is bound. Upon exercise of the Call Option and payment of the Call
Purchase Price for each Securityholder's Securities in accordance with this
Agreement, Corixa will become the sole and exclusive owner of the
Securityholder's Securities, subject to no lien, claim or encumbrance (other
than any liens,

                                      -9-
<PAGE>   10

claims or encumbrances created by Corixa). Except for this Agreement, that
certain Series B Preferred Stock Purchase Agreement dated December 23, 1996 by
and among the Company and the Series B Securityholders and that certain Amended
and Restated Voting Agreement dated December 23, 1996 by and among the Company,
Corixa and the parties listed on the execution pages thereof, each
Securityholder is not a party to any agreement restricting his right to sell or
dispose of his Securities or affecting his rights to vote such Securities or
affecting any other right or privilege pertaining to such Securities.

                (b)     Representations of Corixa. Corixa hereby represents and
warrants to each Securityholder and the Company that this Agreement constitutes
the valid obligation of Corixa and is legally binding on it in accordance with
its terms. Corixa has all requisite authority and power to enter into this
Agreement and to carry out and perform its obligations hereunder. The execution,
delivery and performance of this Agreement will not conflict with Corixa's
Amended and Restated Certificate of Incorporation or Bylaws in effect as of the
date hereof, and will not conflict with, or result in the breach of, any decree
or order of any court, administrative or governmental body or any agreement,
document, indenture or other instrument to which Corixa is a party or by which
its property is bound. Corixa will use its best commercial efforts to not take
any action that will prevent it from carrying out its obligations under this
Agreement.

                (c)     Representations of the Company. The Company hereby
represents and warrants to each Securityholder and Corixa that this Agreement
constitutes the valid obligation of the Company and is legally binding on it in
accordance with its terms. The Company has all requisite authority and power to
enter into this Agreement and to carry out and perform its obligations
hereunder. The execution, delivery and performance of this Agreement will not
conflict with the Company's Amended and Restated Certificate of Incorporation or
Bylaws in effect as of the date hereof, and will not conflict with or result in
the breach of any decree or order of any court, administrative or governmental
body or any agreement, document, indenture or other instrument to which the
Company is a party or by which its property is bound. The Company will use its
best commercial efforts to not take any action that will prevent it from
carrying out its obligations under this Agreement.

        8.      Dispute Resolution. No arbitration with reference to this
Agreement shall arise until the procedures set forth in this Section 8 have been
satisfied. In the event of any dispute with respect to the interpretation of any
provision of this Agreement or with respect to the performance of any party
under this Agreement, any party may at any time provide the other parties
written notice specifying the terms of such disagreement in reasonable detail.
As soon as practicable after receipt of such notice, representatives of the
parties involved in such dispute shall meet at a mutually agreed upon time and
location for the purpose of resolving such disagreement. Such representatives
shall be (a) with respect to the Company and the Securityholders, the Chairman
of the Board of Directors of the Company and (b) with respect to Corixa, the
Chairman of the Board of Directors of Corixa. Such representatives shall engage
in discussions and/or negotiations for a period of up to one hundred twenty
(120) days in an effort to resolve the disagreement or negotiate an
interpretation or revision of the applicable portion of this Agreement that is
mutually agreeable to all parties involved in the dispute (the "Disputing

                                      -10-
<PAGE>   11


Parties"), without the necessity of formal procedures relating thereto. During
the course of such discussion and/or negotiation, all parties shall reasonably
cooperate and provide information that is not materially confidential in order
so that each of the Disputing Parties may be fully informed with respect to the
issues in dispute.

                  The commencement of JAMS (as defined below) dispute resolution
procedures to resolve such disagreement may occur only after the earlier of: (i)
the mutual agreement of the representatives of the Disputing Parties that
resolution of such disagreement through continued negotiation is not likely to
occur, or (ii) following expiration of the one hundred twenty (120) day
negotiation period. Thereafter, any Disputing Party may seek to resolve such
disagreement by initiating an Alternative Dispute Resolution ("ADR") in which
the Judicial Arbitration and Mediation Services ("JAMS"), Seattle, Washington
shall select the arbitrator ("Arbitrator") as provided herein. If JAMS is not in
existence at the time of such dispute the American Arbitration Association,
Seattle, Washington shall be substituted.

                (A)     Selection of Arbitrator. An ADR shall be initiated by a
Disputing Party by sending written notice thereof to the other Disputing Parties
and JAMS, which notice shall state the issues to be resolved. Within ten (10)
business days after receipt of such notice, the other Disputing Parties may, by
sending written notice to the initiating Disputing Party and JAMS, add issues to
be resolved. Within twenty (20) business days after the date of the original ADR
notice, JAMS shall nominate to the Disputing Parties at least five (5) qualified
nominees from JAMS' panel. The Disputing Parties shall have five (5) business
days after the receipt of such nominations to agree on a Arbitrator or, failing
to agree, to rank-order their preferences with the most preferred being given
the lowest number, and mail the rank-order to JAMS. JAMS shall notify the
Disputing Parties of their selection. If all nominees are unacceptable to any
Disputing Party, the procedure shall be repeated and, if the Disputing Parties
cannot select an Arbitrator the second time, JAMS shall select the Arbitrator.

                (B)     Arbitrator With Special Expertise. In the event of a
dispute between the parties relating to any amounts payable under this
Agreement, then, in addition to the procedure set forth in the previous
subsection, the Arbitrator shall (1) be a partner or full member of an
internationally recognized certified public accounting firm that is not an
auditing firm for any Disputing Party and has not provided material services to
any Disputing Party during the last two (2) year period prior to the date of ADR
initiation and (2) have a meaningful biotechnology science and industry
background.

                (C)     ADR Hearing. The Arbitrator shall hold a hearing to
resolve the issues within sixty (60) business days after selection. The location
of the hearing shall be Seattle, Washington. Each Disputing Party may be
represented by counsel. The Arbitrator shall have sole discretion regarding the
admissibility of evidence and conduct of the hearing. At least five (5) business
days prior to the hearing, each Disputing Party shall submit to the other
Disputing Parties and the Arbitrator a copy of all exhibits on which such
Disputing Party intends to rely at the hearing, a pre-hearing brief (up to
thirty (30) pages) and a proposed disposition of the dispute (up to five (5)
pages). The proposed disposition shall be limited to proposed rulings and


                                      -11-
<PAGE>   12

remedies on each issue, and shall contain no argument on or analysis of the
facts or issues; provided, however, that the Disputing Parties shall not present
proposed monetary remedies. Within five (5) business days after close of the
hearing, each Disputing Party may submit a post-hearing brief (up to five (5)
pages) to the Arbitrator.

                (D)     ADR Ruling: Fees and Expenses. The Arbitrator shall
render a disposition on the proposed rulings as expeditiously as possible after
the hearing, but not later than fifteen (15) business days after the conclusion
of the hearing. The Arbitrator shall rule on each issue and shall adopt in its
entirety the proposed ruling of one of the Disputing Parties on each issue. In
the circumstance where the Arbitrator rules for a Disputing Party on a claim in
the form of a claim for monetary damages, the Disputing Parties shall then
submit a proposed remedy within ten (10) days of notice of the ruling. The
proposed remedy may be accompanied by a brief in support of the remedy not to
exceed five (5) pages. The Arbitrator shall rule on and adopt one of the
proposed remedies within ten (10) days of their submission. The Arbitrator's
disposition shall be final and not appealable, except that any Disputing Party
shall have the right to appeal such disposition on the basis it was affected by
fraud or bad faith in connection with the ADR proceedings. The reasonable fees
and expenses of the Arbitrator, as well as the standard charges of JAMS for its
assistance, shall be borne by the Disputing Parties as determined by the
Arbitrator, who shall, in making such determination, take into account the
equities and disposition of the proceedings. A judgment on the Arbitrator's
disposition may be entered in and enforced by any court having jurisdiction over
the Disputing Parties.

                (E)     JAMS Rules. Except as otherwise provided in this Section
8, JAMS Rules shall be used in connection with the ADR.

                (F)     Notwithstanding anything to the contrary in this Section
8, any party to this Agreement may, on good cause shown in the event such party
reasonably believes that it otherwise will suffer irreparable injury, seek a
temporary restraining order and/or preliminary injunction from a court of
competent jurisdiction, to be effective pending the institution of the
arbitration process and deliberation and award of the Arbitrator.

        9.      Miscellaneous

                (a)     No Inconsistent Agreements. Neither the Company nor
Corixa nor any Securityholder will hereafter enter into any agreement which is
inconsistent with this Agreement.

                (b)     Remedies. Any party having rights under any provision of
this Agreement shall have all rights and remedies set forth in this Agreement,
and all rights and remedies which such party has been granted at any time under
any other agreement or contract and all of the rights which such party has under
any law. Any party having any rights under any provision of this Agreement shall
be entitled to enforce such rights specifically (without posting a bond or other
security), to recover damages by reason of any breach of any provisions of this
Agreement and to exercise all other rights granted by law.

                                      -12-
<PAGE>   13

                (c)     Amendments and Waivers. Except as otherwise provided
herein, the provisions of this Agreement may be amended or waived only upon the
prior written consent of the Company, Corixa and holders of at least a majority
of the Securities outstanding at the time of the amendment or waiver; provided,
however, that any amendment to or waiver of any provision of this Agreement that
would adversely affect a particular Securityholder in a manner different from
the other Securityholders shall require the approval of the Securityholder so
adversely affected. Any such amendment or waiver shall bind the Company, Corixa
and all Securityholders.

                (d)     Successors and Assigns. All covenants and agreements in
this Agreement by or on behalf of any of the parties hereto will bind and inure
to the benefit of the respective successors and assigns of the parties hereto
whether so expressed or not.

                (e)     Severability. Whenever possible, each provision of this
Agreement will be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement is held to be prohibited
by or invalid under applicable law, such provision will be ineffective only to
the extent of such prohibition or invalidity, without invalidating the remainder
of this Agreement.

                (f)     Counterparts. This Agreement may be executed
simultaneously in two or more counterparts, any one of which need not contain
the signatures of more than one party, but all such counterparts taken together
will constitute one and the same Agreement.

                (g)     Descriptive Headings. The descriptive headings of this
Agreement are inserted for convenience only and do not constitute a part of this
Agreement.

                (h)     Governing Law. The corporate law of Delaware will govern
all issues concerning the relative rights of the Company, Corixa and the
Securityholders. All other questions concerning the construction, validity and
interpretation of this Agreement and the Exhibits and Schedules hereto will be
governed by and construed in accordance with the domestic laws of the State of
Delaware, without giving effect to any choice of law or conflict of law
provision or rule (whether of the State of Delaware or any other jurisdiction)
that would cause the application of the laws of any jurisdiction other than the
State of Delaware. In furtherance of the foregoing, the internal law of the
State of Delaware shall control the interpretation and construction of this
Agreement, even though under that jurisdiction's choice of law or conflict of
law analysis, the substantive law of some other jurisdiction would ordinarily
apply.

                (i)     Notices. All notices and other communications hereunder
shall be in writing and shall be deemed given if delivered (i) personally, (ii)
by facsimile transmission (receipt verified), (iii) by registered or certified
mail (return receipt requested), postage prepaid, or (iv) sent by express
courier service (receipt verified), to the parties at the following addresses
(or at such other address for a party as shall be specified by like notice;
provided, that notices of a change of address shall be effective only upon
receipt thereof):



                                      -13-
<PAGE>   14

               TO CORIXA:

               Corixa Corporation
               1124 Columbia Street, Suite 464
               Seattle, WA  98104
               Attn:    Chief Operating Officer
                        Corporate Counsel

               TO THE COMPANY:

               GenQuest, Inc.
               c/o Frazier & Company
               601 Union Street
               Two Union Square, Suite 2110
               Seattle, WA  98101
               Attn:  Alan Frazier

               TO THE SECURITYHOLDERS:  At the address set forth on Exhibit A.

               With Copies to:

               Venture Law Group
               4750 Carillon Point
               Kirkland, WA 98033
               Attention:  William W. Ericson
               Telephone:  (206) 739-8700
               Facsimile:  (206) 739-8750

               Wilson Sonsini Goodrich & Rosati
               650 Page Mill Road
               Palo Alto, CA 94304-1050
               Attention:  Kenneth Clark
               Telephone:  (415)  493-9300
               Facsimile:  (415) 493-6811

               Rosner Bresler Goodman & Bucholz
               521 5th Avenue
               New York, NY 10175
               Attention:  Andrew J. Goodman
               Telephone:  (212) 661-2150
               Facsimile:  (212) 949-6131

               (j)     Entire Agreement. This Agreement (including the
documents referred to herein) constitutes the entire agreement between the
parties hereto and supersedes any prior 

                                      -14-
<PAGE>   15

understandings, agreements or representations by or between such parties,
written or oral, that may have related in any way to the subject matter hereof.

                (k)     Further Action Each party hereto shall take such further
action and shall execute and deliver such further documents as reasonably may be
requested by any other party in order to carry out the provisions and purposes
of this Agreement.
   

                (l)     Waiver of Conflicts.  Each party to this Agreement
acknowledges that Venture Law Group ("VLG") is general corporate counsel for
Corixa and has represented Corixa with respect to the negotiation of, and the
transactions contemplated by, this Agreement, the Collaboration Agreement and
that certain Administrative Services and Management Agreement dated as of
December 23, 1996 between the Company and Corixa (the "Administrative Services
Agreement"), and that VLG has in the past performed and may continue to perform
legal services for certain Securityholders and for the Company in matters
unrelated to the transactions described in this Agreement, including the
representation of certain Securityholders in venture capital financings and
other matters and the representation of the Company in certain transactions and
general corporate matters.  Accordingly, each party to this Agreement hereby
(a) acknowledges that they have had an opportunity to ask for information
relevant to this disclosure, and (b) gives its informed written consent to (i)
VLG's general corporate representation of Corixa, (ii) VLG's representation of
certain of the Securityholders in such unrelated matters, and (iii) VLG's
provision of services for the Company through the Company's relationship with
Corixa, as set forth in this Agreement, the Collaboration Agreement and the
Administrative Services Agreement.  Each party to this Agreement further
acknowledges that it has had the opportunity to confer with legal counsel of
its choice in connection with the transactions contemplated hereby.

    



                                      -15-
<PAGE>   16
`



         IN WITNESS WHEREOF, the parties have executed this Amended and Restated
Call Option Agreement as of the date first above written.

                                      CORIXA CORPORATION



                                      By:_______________________________________

                                      Name:_____________________________________

                                      Title:____________________________________


                                      GENQUEST, INC.



                                      By:_______________________________________

                                      Name:_____________________________________

                                      Title:____________________________________


                        SIGNATURE PAGE TO GENQUEST, INC.
                   AMENDED AND RESTATED CALL OPTION AGREEMENT

<PAGE>   17



                                      SECURITYHOLDERS

                                      [***]








                                      [***]







                        SIGNATURE PAGE TO GENQUEST, INC.
                   AMENDED AND RESTATED CALL OPTION AGREEMENT

<PAGE>   18



                                    [***]









                                   [***]








                                   [***]








                                   [***]








                        SIGNATURE PAGE TO GENQUEST, INC.
                   AMENDED AND RESTATED CALL OPTION AGREEMENT


<PAGE>   19

                                    [***]    



                                    [***]    



                                    [***]    



                                    [***]    



                                    [***]    



                                    [***]    


                        SIGNATURE PAGE TO GENQUEST, INC.
                   AMENDED AND RESTATED CALL OPTION AGREEMENT
<PAGE>   20
                                    [***]    

                                    
                                    [***]    


                                    [***]    


                                    [***]    


                                    [***]    


                                    [***]    


                                    [***]    


                                    [***]    


                        SIGNATURE PAGE TO GENQUEST, INC.
                   AMENDED AND RESTATED CALL OPTION AGREEMENT

<PAGE>   21







                                    Exhibit A

                           SCHEDULE OF SECURITYHOLDERS

<TABLE>
<CAPTION>
                                                                            NO. OF SHARES OF
      NAME/ADDRESS                                                      SERIES B PREFERRED STOCK
      ------------                                                      ------------------------
     <S>                                                                       <C>      
      [***]                                                                     [***]

      [***]                                                                     [***]

      [***]                                                                     [***]

      [***]                                                                     [***]

      [***]                                                                     [***]

      [***]                                                                     [***]

      [***]                                                                     [***]

</TABLE>
_________________

* Includes a warrant exercisable for shares of the Company's Series B Preferred
  Stock.




<PAGE>   22



<TABLE>
<CAPTION>
                                                                            NO. OF SHARES OF
      NAME/ADDRESS                                                      SERIES B PREFERRED STOCK
      ------------                                                      ------------------------
<S>                                                                  <C>      
      Corixa Corporation                                                        4,412,613
      1124 Columbia Street, Suite 464
      Seattle, Washington  98104


      [***]                                                                     [***] 

      [***]                                                                     [***] 


                                                                             NO. OF SHARES
      NAME/ADDRESS                                                          OF COMMON STOCK

      [***]                                                                     [***] 

      [***]                                                                     [***] 

      [***]                                                                     [***] 

      [***]                                                                     [***] 

      [***]                                                                     [***] 

      [***]                                                                     [***] 

</TABLE>

- ----------
** [***] 
<PAGE>   23


<TABLE>
<CAPTION>
                                                                             NO. OF SHARES
      NAME/ADDRESS                                                          OF COMMON STOCK
      ------------                                                          ---------------
<S>                                                                           <C>   
      [***]                                                                    [***] 

      [***]                                                                    [***] 

      [***]                                                                    [***] 

      [***]                                                                    [***] 

      [***]                                                                    [***] 

      [***]                                                                    [***] 

      [***]                                                                    [***] 

      [***]                                                                    [***] 
</TABLE>

<PAGE>   24


                                    Exhibit B

                           CALL OPTION EXERCISE NOTICE

Date:    ________________________________

TO:      GENQUEST, INC.
         and the Securityholders of GENQUEST, INC.

         Pursuant to the Amended and Restated Call Option Agreement dated as of
January 1, 1997 by and among GenQuest, Inc. (the "Company"), Corixa Corporation
("Corixa") and the Securityholders of the Company listed on Exhibit A thereto
(the "Call Agreement"), Corixa hereby gives notice of its election to exercise
the Call Option to purchase all Securities of the Securityholders. Capitalized
terms used in this notice shall have the meanings as defined in the Call
Agreement.

         In accordance with Section 2 of the Call Agreement, Corixa requests
that five (5) days after Call Option Record Date, the Company provide to Corixa
in writing a certification as to the number of outstanding Securities on the
Call Option Record Date, the owners of the outstanding Securities on the Call
Option Record Date and the address of each Securityholder.

         The Call Option Purchase Date shall be _________________________.
Corixa hereby requests that the Securityholders provide to Corixa a written
certification by each Securityholder that the representations and warranties
made by the Securityholder in the Call Agreement are true and correct as of the
date of the Securityholder's certification and will be true and correct as of
the Call Option Purchase Date. For this purpose, a Securityholder may sign and
return a copy of this letter on the space provided.

Very truly yours,

CORIXA CORPORATION



- -----------------------------------

         The undersigned Securityholder hereby certifies that the
representations and warranties made by him in the Call Agreement are true and
correct as of the date Securityholder signs this certification and will be true
and correct as of the Call Option Purchase Date.



- -----------------------------------
Signature


- -----------------------------------
Printed Name




<PAGE>   1
                                                                   EXHIBIT 10.26

                   AMENDED AND RESTATED RESEARCH SERVICES AND
                         INTELLECTUAL PROPERTY AGREEMENT


                  This Amended and Restated Services and Intellectual Property
Agreement (this "Agreement") is effective as of January 1, 1997 (the "Effective
Date") by and between Corixa Corporation ("Corixa"), a Delaware corporation, and
Infectious Disease Research Institute ("IDRI"), a Washington not-for-profit
corporation.

                  WHEREAS, Corixa and IDRI are parties to that certain Research
Services and Intellectual Property Agreement dated as of September 29, 1994 (the
"Prior Agreement");

                  WHEREAS, IDRI has been established as an independent institute
for the purposes of engaging in research related to infectious disease and such
other research as may be determined by IDRI pursuant to the direction of its
independent Management Board; and

                  WHEREAS, Corixa desires to continue to sponsor certain
research of IDRI and enjoy all ownership and similar rights in and to certain
Inventions (as defined below) that result from the continued performance of IDRI
research (except as limited herein), and IDRI continues to desire to receive
funding in exchange for the performance of such research and the enjoyment of
such rights.

                  WHEREAS, Corixa and IDRI each, desire to terminate the Prior
Agreement in its entirety and accept the rights and obligations created pursuant
hereto in lieu of the rights and obligations under the Prior Agreement.

                  NOW, THEREFORE, in consideration of the mutual promises set
forth herein and other good and valuable consideration, the parties agree as
follows:


1.                DEFINITIONS

                  As used in this Agreement, the following terms shall have the
meanings indicated:

                  1.1 "Affiliate" as applied to Corixa shall mean any company,
partnership, joint venture, trust or other legal entity or organization in
whatever country organized, that controls, is controlled by or is under common
control with Corixa. The term "control" means possession, direct or indirect, of
the power to direct or cause the direction of management and policies whether
through the ownership of voting securities, by contract or otherwise.

                  1.2 "Agreement Year" shall mean the twelve (12) month period
beginning on January 1, 1997, and each subsequent twelve (12) month period
thereafter.

                  1.3 "Course of Work for IDRI" shall mean (i) in the
performance of scientific or technological work for or on behalf of IDRI, or
(ii) using the time, materials or facilities of IDRI or Corixa.

                  1.4 "Field of Research" shall mean scientific research
produced in the Course of Work for IDRI relating to antigen discovery for use in
infectious disease vaccines and diagnostics.

                  1.5 "IDRI Material" shall mean any substance, composition,
biological material or other material that is discovered, conceived, reduced to
practice, produced, developed or derived by an Investigator in the Course of
Work for IDRI.


<PAGE>   2

                  1.6 "Information" shall mean any data, formulas, know-how,
technical information, process information or other information that is produced
by an Investigator in the Course of Work for IDRI.

                  1.7 "Invention(s)" shall mean any process, use, article of
manufacture, composition of matter or apparatus, whether or not patentable, that
is made, developed, conceived or first actually or constructively reduced to
practice (in whole or in part) by an Investigator (either alone or jointly with
others) in the Course of Work for IDRI.

                  1.8 "Investigator" means (i) any member of IDRI's professional
staff or any IDRI employee who is involved in scientific or technological work
or who may be reasonably expected to develop Information, Inventions or IDRI
Material, or (ii) a person who works at IDRI and is involved in scientific or
technological work or is reasonably expected to develop Information, Inventions
or IDRI Material, or (iii) any person who performs scientific or technological
work for or on behalf of IDRI.

                  1.9 "Net Sales" of a product shall mean all revenues actually
received by Corixa or any Affiliate with respect to transfer of the product to a
person or entity that is not an Affiliate, less (i) any allowances actually made
and taken for returns; shipping and insurance costs actually paid; cash
discounts actually allowed in amounts and for purposes customary in the trade;
sales, use, value-added and similar taxes and duties and similar governmental
assessments (on products as shipped); provided such amounts would otherwise have
been included in "Net Sales."

                  1.10 "Patent Right(s)" shall mean all United States patent
applications, including all divisions, continuations and continuations-in-part
thereof, and all foreign patent applications or the equivalent thereof, and all
Letters Patent or the equivalent thereof issuing thereon, and all reissues,
re-examinations and extensions thereof, insofar as they contain, represent or
assert one or more claims to an Invention.

                  1.11 "Director of IDRI" shall mean that person appointed by
the IDRI Management Board as Executive Director of IDRI, and such person's
successors as appointed from time to time by the IDRI Management Board.

                  1.12 "Research Services" shall mean any research conducted by
an Investigator in the Field of Research that is funded by Corixa pursuant to
Section 5 below, whether or not such research is conducted during normal
business hours or on the premises of IDRI.

                  1.13 The use herein of the plural shall include the singular,
and the use of the masculine shall include the feminine.

2.                TERM; RENEWAL

                  2.1 Initial Term. The initial term of this Agreement shall be
from the Effective Date until December 31, 1999, unless this Agreement is
earlier terminated pursuant to Section 16 hereof.

                  2.2 Renewal. Upon the expiration of the initial term described
in Section 2.1 above, this Agreement may be renewed at the sole discretion of
Corixa for one or more additional three (3) year terms.
<PAGE>   3
3.                SERVICES PROVIDED BY CORIXA TO IDRI

                  Subject to the provisions of this Agreement, and upon IDRI's
reasonable request, Corixa agrees to perform for IDRI the following services
(collectively, "IDRI Services"):

                  3.1 Medical Benefits. Corixa shall provide the employees of
IDRI medical (including vision) insurance benefits substantially similar to
those benefits offered, from time to time, by Corixa to Corixa's own employees;
it being understood that IDRI shall be responsible for payment in full for such
benefits. Corixa's monthly costs of providing such medical insurance benefits
and therefore the amounts to be billed to IDRI shall be in accordance with
Schedule 3 as amended from time to time and shall include all costs incurred in
setting up such medical benefits and all costs incurred by Corixa in maintaining
such medical benefits, including but not limited to the payment of any premiums
required.

                  3.2 Other Employee Benefits. Corixa shall, at IDRI's option,
provide to the employees of IDRI dental insurance benefits, disability benefits,
and benefits under any life and accidental death and dismemberment plan, and
occupational health services plan, substantially similar to the benefits
provided, from time to time, by Corixa to Corixa's own employees; it being
understood that IDRI shall be responsible for payment in full for such benefits
in accordance with Schedule 3 as amended from time to time. IDRI employees shall
not participate in Corixa's 401(k) benefits plan, IRC Section 125 flexible
benefit plan, profit sharing, key person, executive bonus, or any other employee
benefit programs.

                  3.3 Biomedical Research Facilities. Corixa shall provide to
IDRI reasonable biomedical research space at Corixa's facilities leased from
Health Science Properties, Inc., 1124 Columbia Street, Suite 200,
Seattle,Washington 98104 (the "Research Space"). Corixa shall bill IDRI in
accordance with Schedule 3 for such Research Space, which amount shall be
adjusted by Corixa and IDRI from time to time pro rata to reflect future changes
in the percentage and cost to Corixa of Corixa's facilities at 1124 Columbia
Street, Suite 200, Seattle, Washington 98104 used by IDRI.

                  3.4 Biomedical Research Facility Services. Corixa shall
provide to IDRI facility services at Corixa's facilities from Health Science
Properties, Inc., in 1124 Columbia Street, Suite 200, Seattle, Washington 98104
including: utilities; use of copiers, telephones and facsimile machines; library
services; and mail room services. All services provided to IDRI pursuant to this
Section 3.4 shall be charged to IDRI in accordance with Schedule 3 as amended
from time to time which charges shall be at the same rate charged to Corixa by
the facility or third party service providers.

                  3.5 Equipment Sharing. Each of IDRI and Corixa shall allow the
other the reasonable use of certain scientific and computer equipment from time
to time as reasonably requested, subject in all cases to each party's right to
limit access based upon its own demand for such equipment. Corixa and IDRI agree
that the vast majority equipment provided by Corixa and any use of IDRI's
equipment by Corixa is minor. IDRI shall pay Corixa for the maintenance and cost
of the equipment as provided for in Schedule 3 as amended from time to time.


                  3.6 Insurance. IDRI shall be covered by Corixa's casualty and
property insurance and shall pay a pro rata portion of Corixa's direct charges
for premiums based on the percentage of Corixa's facilities utilized by IDRI.
IDRI's charge for such premiums shall be in accordance with Schedule 3 and shall
be adjusted by Corixa and IDRI from time to time in accordance with changes in
Corixa's premiums and the amount of research space occupied by IDRI. IDRI made
an initial payment of $1,320 upon execution of the Prior Agreement.

                  3.7 Other Services and Supplies. Corixa may also provide to
IDRI, at Corixa's sole discretion, other services requested from time to time by
IDRI, including reasonable secretarial, administrative, and laboratory and
facility support services, including IDRI's allocated share of any directly
consumed supplies. IDRI's charge for such services and supplies shall be in
accordance with Schedule 3 as amended from time to time Corixa shall determine
the method of determining Corixa's costs for such other services which in no
event shall be more than the fair market value of such services from third party
service providers.
<PAGE>   4

                  3.8 Services Period. Corixa provided the IDRI Services
throughout the term of the Prior Agreement. Corixa shall continue to provide the
IDRI Services, commencing January 1, 1997 and ending on December 31, 1999 (the
"IDRI Services Period"). The IDRI Services Period shall automatically be renewed
and extended for periods of one (1) year, unless either Corixa or IDRI gives at
least one (1) month prior written notice to such other party to terminate the
provision by Corixa of all or any part of the IDRI Services, in which case the
IDRI Services Period shall be renewed and extended only with respect to the IDRI
Services that are not so terminated.

4.                PAYMENT FOR IDRI SERVICES

                  4.1 Payments.

                  (a) IDRI paid to Corixa [***] upon execution of the Prior
Agreement, which amount was allocated as follows: [***] to payment of rent on
the Research Space for the period ending on December 31, 1994; [***] for the
then applicable insurance premium payment pursuant to Section 3.6 and the
remaining [***] was credited against future amounts payable by IDRI for IDRI
Services.

                  (b) Before the end of each calendar quarter, Corixa and IDRI
shall agree upon the amounts to be paid to Corixa for IDRI Services to be
performed during the subsequent calendar quarter, which shall include a pro rata
adjustment for any additional research space to be leased by IDRI. A description
of the amounts of such payments for each subsequent calendar quarter shall be
attached as Schedule 3 to this Agreement which Schedule may be amended from time
to time by prior written agreement of the parties.

                  4.2 Timing of Payments. The amounts required to be paid to
Corixa for IDRI Services in accordance with Schedule 3 shall be invoiced by
Corixa at the end of each month. IDRI shall pay each such invoice no later than
twenty (20) days after its receipt. IDRI shall pay Corixa interest at a rate of
one percent (1%) per month (calculated pro-rata for any portion of a month) on
any amounts not paid within such time.

5.                FUNDING FOR RESEARCH SERVICES

                  5.1 Payments. In return for Research Services and the
ownership of certain intellectual property rights provided in this Agreement,
Corixa shall pay to IDRI the following amounts at the times set forth in Section
5.2 below:

                  (a) During the first Agreement Year, subject to the deferral
provisions set forth in Section 5.3 below, Corixa shall pay to IDRI the amount
set forth on Schedule 5.1 (a) hereto, as amended by prior written agreement of
the parties from time to time, to reflect the amount and terms of payment agreed
to by the parties in connection with Section 5.1(b) for Research Services to be
provided during such period.

                  (b) No later than thirty (30) days prior to the end of any
Agreement Year, a committee composed of the Director of IDRI, a member of the
Management Board of IDRI, the Chief Executive Officer of Corixa and the Director
of Antigen Discovery of Corixa shall create an annual research plan (each, a
"Research Plan") with respect to Research Services to be provided during the
subsequent Agreement Year. Each such Research Plan shall include a description
of the amounts and the terms of payments for Research Services for each
subsequent Agreement Year as well as the scope and focus of the Research
Services to be provided and shall be subject to the review and approval of
senior management of Corixa. Each Research Plan shall be attached as an addendum
to this Agreement. The initial Research Plan is attached hereto.

                  5.2 Timing of Payments. The amount required to be paid to IDRI
in any Agreement Year as provided in Section 5.1 above shall be paid in four (4)
equal quarterly installments on

<PAGE>   5



January 31, April 30, July 31 and October 31 of such Agreement Year, unless such
date shall not be a business day, in which case payment shall be made on the
first business day after such date. The first installment shall be paid on
January 31.

                  5.3 Deferral of Payments. Corixa shall defer all or part of
any quarterly or annual payment otherwise required to be made pursuant to
Section 5.1 above to any future quarter or year as shall be specified by IDRI,
upon submission by IDRI of a written request for such deferral prior to the date
on which IDRI is entitled to such payment.

                  5.4 Other Funding Sources. IDRI shall have the right to
conduct research in any area, whether or not related to Research Services, in
addition to Research Services and, subject to the terms of Section 7 hereof,
IDRI shall own all patent rights and other ownership rights with respect to any
intellectual property arising from such research. Any additional funding
obtained by IDRI pursuant to this Section 5.4 shall not reduce Corixa's
obligation to make the funding payments provided under Section 5.1 hereof.

6.                PATENTS, INVENTIONS, INFORMATION AND IDRI MATERIAL

                  6.1 Assignment of Rights.


                  (a) IDRI agrees to assign and hereby assigns all of its
rights, title and interest in and to any Invention(s) and Patent Rights to
Corixa.

                  (b) IDRI shall cooperate with Corixa in the preparation,
filing, prosecution, maintenance, assignment and enforcement of any Invention(s)
and Patent Rights, and shall perform all necessary acts relating thereto,
including without limitation, executing, acknowledging and delivering any and
all papers, documents and instruments required for effecting such prosecution,
maintenance assignment and enforcement; provided, however, that Corixa shall pay
all costs incurred by IDRI in complying with the requirements of this Section
6.1(b).

                  6.2 Patent Rights Policy. An overall policy with respect to
the filing of Patent Rights for presentation to the senior management of Corixa
shall be created by a committee composed of the Director of IDRI, the Chief
Executive Officer of Corixa and the Director of Antigen Discovery of Corixa.
Corixa shall pay all of the costs for prosecution and maintenance of such Patent
Rights using patent counsel of its choice.

                  6.3 Development Policy.

                  (a) Corixa undertakes, consistent with its business plans, to
use Inventions, Information, IDRI Material and Patent Rights diligently for the
benefit of society, licensing to others those Patent Rights under which it
cannot develop a commercial product or service within a reasonable period of
time or which fall outside its areas of interest. Corixa may waive these
guidelines at the request of IDRI when, in their combined judgment, there is a
compelling benefit to society in doing so. As a general policy, Corixa believes
society is best served by rapidly identifying and protecting Inventions, but
Corixa shall undertake to judge each case individually in consultation with
IDRI.

                  (b) In the event that IDRI believes that there are certain
Patent Rights (i) that fall outside Corixa's areas of interest, (ii) that
concern technology that is not currently, or in the future likely to be,
competitive with the business or products of the Company and (iii) with respect
to which a third party has expressed or may express interest in
commercialization, then, in further consideration of the License granted in
Section 7.2, IDRI shall have the right to request Corixa to review in good faith
its intentions with respect to the development of a product or products related
to such Patent Rights for a period of ninety (90) days. If after such ninety
(90) day period, Corixa reasonably concludes that it does not intend to proceed
with the development of a product or products or service or services related to
such Patent Rights, then Corixa shall enter into an agreement with IDRI
relinquishing its rights to such Patent Rights (in whole or in part) as Corixa,
in its sole discretion, deems appropriate in light of the combined interest of
society, IDRI and Corixa. This Section 6.3(b) shall not apply to any Patent
Rights arising from 
<PAGE>   6

or related to the Research Services and shall not require Corixa to take any
action which it in good faith believes would undermine its competitive position.

                  6.4 Investigator Agreements. As a condition to engaging or
employing an Investigator, IDRI shall enter into a written agreement with each
Investigator that shall provide the Investigator shall: (i) promptly report to
IDRI any Invention made by the Investigator (either alone or jointly with
others); (ii) assign all his/her rights, title and interest in and to Inventions
and Patent Rights to IDRI; (iii) cooperate with IDRI and Corixa in the
preparation, filing, prosecution, maintenance, assignment and enforcement of any
Invention or Patent Right; (iv) comply with the obligations set forth in Section
8.4 below; and (v) perform all acts and sign, execute, acknowledge and deliver
any and all papers, documents and instruments required for effecting the
obligations and purposes of this Agreement.

                  6.5 Right to Use Information and IDRI Material. IDRI grants to
Corixa a fully paid-up, royalty-free, worldwide, perpetual, noncancellable
exclusive right and license to use and to sublicense or transfer to third
parties Information and IDRI Material.

7.                INTELLECTUAL PROPERTY NOT RELATED TO RESEARCH SERVICES

                  7.1 Funding from U.S. Government and Non-Profit Organizations.
Subject to the obligation of Section 7.2, IDRI shall be permitted to enter into
agreements with agencies, departments or instrumentalities of the United States
government and non-profit organizations, foundations and similar organizations
(including but not limited to the National Institutes of Health, the World
Health Organization and the National Institute of Allergy and Infectious Disease
and similar organizations) ("Organizations") for funding of research at IDRI
which prevents IDRI from assigning all rights, title and interest to Corixa in
and to inventions and patent rights which result from such funding (each
agreement an "Organization Agreement" and each such invention and patent right
an "Organization Invention" and "Organization Patent Right," respectively).

                  7.2 Exclusive License.

                  (a) IDRI hereby grants to Corixa and Corixa hereby accepts
from IDRI a worldwide, perpetual, noncancellable right and license to make, have
made, use and sell or have sold on its behalf any product, service, process,
machine, apparatus or article of manufacture or composition, including the right
to sublicense to third parties, pursuant to the terms and conditions of this
Agreement, under any Organization Invention or Organization Patent Right in
which ownership must be retained by IDRI or in which the Organization does not
permit ownership to be retained by Corixa pursuant to any Organization
Agreement. This license is granted to the extent permitted under United States
law and is exclusive except as to the United States government or other
Organization, which may retain a non-exclusive royalty-free license under such
Organization Inventions and Organization Patent Rights. Corixa at its cost and
expense shall file, prosecute and maintain Organization Patent Rights licensed
under this Section 7.2 using patent counsel of its choice.

                  (b) With respect to the Organization Patent Rights licensed to
Corixa under Section 7.2(a), Corixa shall pay to IDRI a running royalty of
[***]% of net sales of any product sold by Corixa which is covered by an
unexpired, valid claim of an Organization Patent Right in the country in which
such product is made, used or sold; provided, however, that with respect to any
antigen licensed hereunder, such royalty shall be payable only with respect to
the first Corixa product incorporating such antigen.

                  (c) In the event that Corixa is obligated to pay a royalty for
a product to a party other than an Affiliate ("Other Party Royalty") for which
product a royalty is owed to IDRI, then [***] of such Other Party Royalty shall
be fully creditable against the royalty owed to IDRI under this Section 7.2 of
this Agreement.

                  (d) No royalty shall be due or payable under this Section 7.2
with respect to any product for which a royalty is paid under Section 16.4 of
this Agreement.
<PAGE>   7
8.                OBLIGATIONS OF IDRI

8.1 Conduct of Research. IDRI shall use directly or indirectly the funds paid by
Corixa pursuant to Section 5 hereof to perform research in the Field of Research
and may apply the funds for and in such amounts and at such times and such
specific purposes and for such uses as it shall deem necessary or appropriate to
further such research, including without limitation to pay salaries, purchase
equipment and to pay other direct and indirect costs associated with such
research.

8.2 Disclosure. During the term of this Agreement, and thereafter while IDRI is
conducting Research Services, IDRI shall:

         (a) promptly and systematically disclose to Corixa significant
developments relating to the discovery of Information, Inventions and IDRI
Material;

         (b) for the purpose of facilitating disclosure to Corixa of
Information, Inventions and IDRI Material, permit duly authorized employees or
representatives of Corixa to visit Investigators' laboratories at IDRI or other
IDRI facilities, at reasonable times and with reasonable notice; and

         (c) at Corixa's reasonable request, provide Corixa with reasonable
quantities of IDRI Material.

8.3 Periodic Reporting. IDRI shall, on a continuing basis, advise Corixa of the
results of research being performed at IDRI, and at least once every three (3)
months provide Corixa with a written progress report concerning such research.

8.4 Publishing Limitations. At any time during or after the term of this
Agreement, IDRI may publish, submit for publication or otherwise provide to or
exchange with any person or entity any previously unpublished Information,
Inventions or IDRI Material; provided, however, that IDRI agrees, and shall
cause each Investigator to agree prior to his/her becoming an Investigator, not
to publish, submit for publication or otherwise exchange any previously
unpublished Information, Inventions or IDRI Material without the express written
consent of Corixa (which consent shall not be unreasonably denied), until the
earlier of (i) thirty (30) after IDRI has satisfied its obligation under Section
8.2(a) above with respect to such Information, Invention or IDRI Material or
(ii) Corixa having filed for patent protection with respect thereto.
Notwithstanding the foregoing, if requested in writing by Corixa, IDRI agrees
not to publish, submit for publication or otherwise exchange any previously
unpublished Information, Invention or IDRI Material specifically designated by
Corixa for a period of up to three (3) months after disclosure thereof to Corixa
pursuant to Section 8.2(a) above provided that such Information, Invention or
IDRI Material is potentially useful for discovering a cure or treatment for a
disease if such additional time is for the purpose of (a) completing filing of
patent applications relating thereto, or confirming biological activity of a
material encompassed thereby, or (b) completing sequencing of a material
encompassed thereby, or expressing a protein encompassed thereby; provided
further that, such three (3) month period may be extended to six (6) months,
(i.e., an additional three (3) months) if such Invention, Information or IDRI
Material otherwise meets the requirements for extension to six (6) months and
relates to a product which Corixa or its licensee(s) intends to commercially
develop.

8.5 Intellectual Property Safeguards. Within thirty (30) days of the execution
of the Prior Agreement, IDRI established appropriate policies with respect to
the safeguarding of intellectual property, including but not limited to
Information, Inventions, IDRI Materials and other data, formulas, know-how,
biological materials and/or other information related to the research being
conducted by IDRI. Such policies shall continue to be subject to the reasonable
review and approval of Corixa, and shall continue to include an obligation that
each Investigator, employee or consultant of IDRI enter into an appropriate
agreement with IDRI with respect to such safeguarding of intellectual property.
<PAGE>   8
9.       OBLIGATIONS OF CORIXA

                  9.1 Grant of License. Notwithstanding any other provision in
this Agreement, Corixa hereby grants to IDRI a worldwide, perpetual,
noncancellable, nonexclusive, royalty-free right and license under all
Inventions and Patent Rights only for the purpose of conducting non-commercial
research; provided, however, that IDRI shall not assign, sublicense or otherwise
transfer any or all of its interest in such license to any other person or
entity without the prior written consent of Corixa. Any assignment, sublicense
or other transfer by IDRI in violation of this Section 9.1 shall be void and
without effect.

                  9.2 Limitation on Assignment of Patent Rights. Corixa shall
not assign ownership to Patent Rights obtained from IDRI under this Agreement to
another entity without the written consent of IDRI, which consent shall not be
unreasonably withheld or delayed, except such consent shall not be required: (i)
where such assignment is in conjunction with a transfer of all or substantially
all of the business, stock or assets of Corixa to an entity that is not an
Affiliate of Corixa; or (ii) where such assignment is to an Affiliate that is a
majority-owned subsidiary of Corixa. For the purposes of this Section 9.2, the
granting of a non-exclusive or exclusive license under Patent Rights shall not
be an assignment.

10.               REDUCTIONS IN ROYALTIES

                  10.1 Reduction Based on Multiple Antigens. If it is necessary
for Corixa to obtain licenses to antigens from third parties that are used in
any particular product in combination with antigens licensed under this
Agreement, then the percentage royalty rate on Net Sales of such product under
Sections 7.2 and 16.4 shall be reduced on a pro rata basis along with royalties
to be paid to such third parties with respect to such product based on the
number of antigens so used; provided, however, that, except as otherwise set
forth in the provisionsto Sections 7.2(b) and 16.4(c) respectively, in no event
shall IDRI be entitled to royalties consisting of less than [***]% of Net Sales
for any such product; and provided further, that in no event shall IDRI be
entitled to royalties on any product consisting of more than [***]% of Net Sales
for any such product.

                  10.2 Reduction in the Event of Infringement. During the term
of an infringement action relating to the Patent Rights, royalties under
Sections 7.2 and 16.4 shall accrue, but shall not be payable by Corixa until the
final dispensation of such action, either by settlement or final adjudication.
In the event of a settlement pursuant to which Corixa is required to pay a third
party as a result of infringement, Corixa shall have the right to offset such
deferred royalties to pay such settlement and in addition shall have the right
to reduce by [***]% future royalties payable under Sections 7.2 and 16.4 until
such settlement is paid in full.

11.               CONFIDENTIALITY

11.1 Nondisclosure. During the term of this Agreement, it is contemplated that
Corixa shall disclose to IDRI and Investigators proprietary and confidential
technology, inventions, technical information, biological materials, business
information, product development information and the like which are owned or
controlled by Corixa or which Corixa is obligated to maintain in confidence and
which are designated by Corixa as confidential ("Corixa Confidential
Information"). Except as otherwise provided in this Agreement, IDRI agrees to
retain such Corixa Confidential Information in confidence and not to use (except
as provided in this Agreement) or disclose any such Corixa Confidential
Information to a third party without the prior written consent of Corixa. For
purposes of this Section 11 and without limiting the generality of the
foregoing, Corixa Confidential Information shall include all information
relating to the lease agreements each party hereto entered into with the Fred
Hutchinson Cancer Research Center, and Corixa and IDRI each agree to maintain in
confidence and not disclose the terms and conditions of such lease agreements.



<PAGE>   9

11.2 Exceptions. The obligations of IDRI pursuant to Section 11.1 hereof shall
not apply to Corixa Confidential Information that:

     (a) is known to IDRI or generally known to the public prior to its
disclosure hereunder; or

     (b) becomes known to the public by some means other than a breach of this
Agreement, including publication and/or laying open to inspection of any patent
applications or patents; or

     (c) is disclosed to IDRI by a third party having a lawful right to make
such disclosure, and who is not under any obligation of confidentiality to
Corixa; or

     (d) is required to be disclosed to a governmental entity or agency or
pursuant to the lawful requirement or request of a governmental entity or
agency.

11.3 IDRI Information. Corixa agrees not to disclose to a third party
Information, Inventions and IDRI Material disclosed to Corixa by IDRI or an
Investigator, except under an obligation of confidentiality. Corixa's obligation
under this Section 11.3 with respect to any Information, Inventions or IDRI
Material shall terminate one (1) year after disclosure thereof to Corixa
(provided that such period shall be extended to eighteen (18) months in the case
of any Information, Inventions or IDRI Material which IDRI is prevented from
publishing pursuant to Section 8.4 above). The foregoing obligation shall not
apply to any Information, IDRI Material or Invention which:

(a) is known to Corixa or generally known to the public prior to its disclosure
hereunder; or

(b) becomes known to the public by some means other than a breach of this
Agreement, including publication and/or laying open to inspection of any patent
applications or patents; or

(c) is disclosed to Corixa by a third party having a lawful right to make such
disclosure, and who is not under any obligation of confidentiality to IDRI; or

(d) is required to be disclosed to a governmental entity or agency or pursuant
to the lawful requirement or request of a governmental entity or agency.

12. WARRANTIES

                  12.1 Authority. Each of IDRI and Corixa hereby warrants and
represents to the other that it has the full right and authority to enter into
this Agreement.

13. INDEMNIFICATION 

                  13.1 Obligation of Corixa to Indemnify. Each party shall
promptly notify the other upon receiving notice of any claim, lawsuit or other
proceeding relating to a product or process that incorporates or is manufactured
by use of any Invention, Information, IDRI Material or Patent Right. Corixa
agrees that it shall indemnify and hold harmless IDRI and all Investigators, and
other members, researchers, employees, officers and trustees of IDRI, and each
of them (each an "Indemnified Party") from and against any and all third party
claims, causes of action and costs (including reasonable attorney's fees and
costs of appearing as witnesses or otherwise preparing to defend any such claim
or cause of action) of any nature made or lawsuits or other proceedings filed or
otherwise instituted against any Indemnified Party or Parties arising out of
Corixa's design, manufacture, sale or use of any such product or process;
provided, however, that Corixa shall not indemnify any Indemnified Party from or
against any claims, causes of action or costs that result from the recklessness,
gross negligence or willful misconduct of such Indemnified Party (except to the
extent that any act of patent infringement is by its terms considered willful,
in which case Corixa shall indemnify any Indemnified Party); provided, further,
that Corixa shall not provide indemnification to any Indemnified Party for any
amount exceeding in the aggregate the coverage limitations of Corixa's then
existing applicable insurance policy. IDRI shall 
<PAGE>   10
promptly notify Corixa of any such claim. Corixa may elect to assume the defense
of any claim, lawsuit, or other proceeding identified in this Section3, but IDRI
and/or any Indemnified Party may retain additional counsel and assume the
defense of such suit if (i) Corixa specifically authorizes the retaining of such
counsel and assumption of such defense or (ii) IDRI or any Indemnified Party has
been advised by counsel that one or more legal defenses may be available to it
which may not be available to Corixa, in which case Corixa shall not be entitled
to assume the defense of such suit, notwithstanding its obligation to bear the
reasonable fees and expenses of counsel to IDRI or any Indemnified Party. In the
event that any Indemnified Party elects to assume the defense of any suit and
retain counsel as permitted herein, in no event shall Corixa be responsible for
the fees and expenses of more than one (1) additional counsel for each such
Indemnified Party or for any settlement or compromise that Corixa has not
approved in writing. Subject to the foregoing, Corixa shall have the right to
control the defense, settlement or compromise of any claim which is indemnified
hereunder.

14. ASSIGNMENT; SUCCESSORS

                  14.1 Written Consent Required. Subject to Section 9.2 above,
this Agreement shall not be assignable by either of the parties without the
prior written consent of the other party, which consent shall not be
unreasonably withheld or delayed; provided, however, that Corixa may assign this
Agreement without the consent of IDRI (i) pursuant to a transfer or sale to an
entity other than an Affiliate of all or substantially all of Corixa's stock
business or assets to which this Agreement relates, or a consolidation or merger
of Corixa with or into any other entity, or any other corporate reorganization
in which Corixa is not the continuing or surviving entity of such consolidation,
merger or reorganization, or any transaction or series of related transactions
by Corixa in which in excess of fifty percent (50%) of Corixa's voting power is
transferred, or (ii) to a wholly-owned subsidiary. Any assignment in violation
of this Section 14.1 shall be void and without effect.

                  14.2 Successors and Assigns. Subject to the limitations on
assignment set forth herein, this Agreement shall be binding upon and inure to
the benefit of said successors in interest and assigns of Corixa and IDRI. Any
such successor or assignee of a party's interest shall expressly assume in
writing the performance of all the terms and conditions of this Agreement to be
performed by said party.

15. SUSPENSION OF FUNDING AND RESEARCH SERVICES

                  15.1 Upon Material Breach by IDRI. Upon material breach of any
material provision of this Agreement by IDRI, in the event the breach is not
cured within sixty (60) days after written notice to IDRI by Corixa, in addition
to any other remedy it may have, Corixa may suspend further funding under this
Agreement until the breach is cured. Suspension of payments by Corixa as
permitted by this Section 15.1 shall not permit IDRI to terminate this Agreement
under Section 16.1 below.

                  15.2 Upon Material Breach by Corixa. Upon material breach of
any material provision of this Agreement by Corixa, in the event the breach is
not cured within sixty (60) days after written notice to Corixa by IDRI, in
addition to any other remedy it may have, IDRI may suspend the research work on
behalf of Corixa in the Field of Research of this Agreement until such breach is
cured; provided that such suspension shall not affect assignment or rights by
operation of this Agreement. Suspension of research work in the Field of
Research by IDRI as permitted by this Section 15.2 shall not permit Corixa to
terminate this Agreement under Section 16.2 below.

16. TERMINATION

                  16.1 IDRI's Right to Terminate.

                  (a) Subject to Section 15.1 hereof, IDRI may terminate this
Agreement upon sixty (60) days written notice to Corixa if Corixa fails to make
a payment required hereunder; provided,
<PAGE>   11
however, that such termination shall not take effect if Corixa makes the payment
prior to expiration of such sixty (60) day period.

                  (b) IDRI may terminate this Agreement immediately, upon
written notice to Corixa, if Corixa materially breaches any other provision
hereof, and fails to cure such breach within sixty (60) days after receiving
written notice from IDRI specifying the precise nature of the breach.

                  (c) IDRI may terminate this Agreement, upon thirty (30) days
prior written notice to Corixa, in the event that Corixa becomes insolvent,
voluntarily files for bankruptcy or reorganization, or makes a general
assignment in favor of creditors, or if bankruptcy proceedings are commenced
against Corixa (and not dismissed within ninety (90) days).

                  (d) IDRI's ability to terminate this Agreement pursuant to
this Section 16.1 shall not be its exclusive remedy, but shall be in addition to
any other remedy available to it at law or in equity.

                  16.2 Corixa's Right to Terminate.

                  (a) In the event the Director of IDRI is no longer available,
willing or able to continue directing research at IDRI, IDRI shall promptly
notify Corixa and may nominate a replacement reasonably satisfactory to Corixa;
provided, however, if IDRI does not nominate a replacement who is reasonably
satisfactory to Corixa within sixty (60) days of such notice, Corixa may
terminate this Agreement upon three (3) months written notice to IDRI.

   
                  (b) Corixa may at its sole option terminate this Agreement
upon three (3) months written notice to IDRI if the aggregate funding obtained
by IDRI from sources other than Corixa is an amount less than One Hundred Fifty
Thousand Dollars ($150,000) for any one Agreement Year.
    

                  (c) Subject to Section 15.2 above, Corixa may terminate this
Agreement immediately, upon written notice to IDRI, if IDRI materially breaches
any provision hereof, and fails to cure such breach within sixty (60) days after
receiving written notice from Corixa specifying the precise nature of the
breach.

                  16.3 Survival. The rights and obligations of the parties set
forth in Sections 6 through 11,13 16.4 and in this Section 16.3, shall survive
the expiration or termination of this Agreement for any reason, and shall
continue in effect until by their terms they are no longer applicable.


                  16.4 Invention and Patent Rights After Termination.

                  (a) In the event this Agreement is terminated for any reason
whatsoever, including but not limited to expiration of the term of this
Agreement, IDRI shall not be obligated to assign to Corixa an Invention and
corresponding Patent Rights that were not conceived or actually or
constructively reduced to practice prior to such termination, unless such
Invention is conceived or actually or constructively reduced to practice within
six (6) months after such termination.

                  (b) Subject to Section 16.4(a) above, termination of this
Agreement for any reason whatsoever shall not affect Corixa's ownership interest
in Inventions and corresponding Patent Rights which Inventions are conceived or
actually or constructively reduced to practice prior to termination.

                  (c) In the event that this Agreement is terminated by IDRI
under the provisions of Section 16.1(a) above, then with respect to Patent
Rights to which Corixa retains an ownership interest under this Agreement,
Corixa shall pay IDRI a running royalty of [***] of net sales of any product
sold by Corixa or a sublicensee which is covered by an unexpired valid claim of
such a Patent Right in the country in which such product is made, used or sold;
provided, however, that with 

<PAGE>   12
respect to any antigen licensed hereunder, such royalty shall be payable only
with respect to the first Corixa product incorporating such antigen.

                  (d) In the event that Corixa is obligated to pay a royalty for
a product to a party other than an Affiliate ("Other Party Royalty") for which
product a royalty is also owed to IDRI, then [***] of such Other Party Royalty
shall be fully creditable against the royalty owed to IDRI under Section 16.4(c)
of this Agreement. In the event that ownership in any such Patent Right is
assigned by Corixa to another entity, Corixa shall obligate such entity to the
payment provisions of Section 16.4(c).


17. MISCELLANEOUS

                  17.1 Relationship of IDRI and Corixa. The relationship between
IDRI and Corixa is that of independent contractors. Except as otherwise provided
herein, IDRI and Corixa are not joint venturers, partners, principal and agent,
master and servant or employer and employee, and have no relationship other than
as independent contracting parties. Except as otherwise provided herein, IDRI
shall have no power to bind or obligate Corixa in any manner, and Corixa shall
have no power to bind or obligate IDRI in any manner. Notwithstanding any other
provision in this Agreement to the contrary, IDRI is and shall remain an
independent entity, operated under the supervision and direction solely of its
Management Board. This Agreement may be terminated by IDRI or Corixa at any time
pursuant to the terms of this Agreement and, except as otherwise provided
herein, IDRI and Corixa shall have no further obligation to each other.

                  17.2 Governing Law. This Agreement shall be governed by and
construed under the laws of the State of Washington as applied to agreements
among Washington residents entered into and to be performed entirely within the
State of Washington.

                  17.3 Entire Agreement. Except as provided in the next
sentence, this Agreement sets forth the entire agreement and understanding
between the parties as to the subject matter hereof and supersedes all prior
written or oral agreements relating to the subject matter hereof. There shall be
no amendments or modifications to this Agreement, except by a written document
which is signed by both parties.

                  17.4 Headings. The headings in this Agreement have been
inserted for the convenience of reference only and are not intended to limit or
expand the meaning of the language contained in any section hereof.

                  17.5 Delay or Waiver. Any delay in enforcing a party's rights
under this Agreement or any waiver as to a particular default or other matter
shall not constitute a waiver of such party's right to the future enforcement of
its rights under this Agreement, except as set forth in a written and signed
waiver as to a particular matter for a particular period of time.

                  17.6 Notices. Any notices given pursuant to this Agreement
shall be in writing and shall be deemed delivered upon (i) the date of delivery,
if personally delivered, (ii) three (3) business days after being mailed by
certified or registered mail, postage prepaid and properly addressed, with
return receipt requested, or (iii) the date of facsimile report, if sent by
facsimile and confirmed by certified or registered mail. Notices shall be
delivered to the respective parties as indicated below, or any other address
designated by a party to the other party in writing under the notice provisions
of this Section 17.6:

        To Corixa:                         Corixa Corporation
                                           1124 Columbia Street, Suite 200
                                           Seattle, WA  98104
                                           Attn:    Mark McDade
                                                    Chief Operating Officer


<PAGE>   13

        To IDRI:                           Infectious Disease Research Institute
                                           1124 Columbia Street, Suite 200
                                           Seattle, WA  98104
                                           Attn:  Director

                  17.7 Severability. If any provision of this Agreement is held
to be illegal or unenforceable, that provision shall be limited or eliminated to
the minimum extent necessary so that this Agreement shall otherwise remain in
full force and effect and enforceable.

                  17.8 Counterparts. This Agreement may be executed in one or
more counterparts, each of which shall be deemed an original, but all of which
taken together shall constitute one and the same instrument.



<PAGE>   14


IN WITNESS WHEREOF, each of the parties hereto has caused this Agreement to be
executed on its behalf, effective as of the date set forth above.

                               CORIXA CORPORATION



                               By: /s/ MARK McDADE
                                   ---------------------------------------------
                               Name: Mark McDade
                                     -------------------------------------------
                               Title: Chief Operating Officer
                                      ------------------------------------------

                               INFECTIOUS DISEASE RESEARCH INSTITUTE



                               By: /s/ DAVID G. WEBSTER
                                   ---------------------------------------------
                               Name: David G. Webster
                                     -------------------------------------------
                               Title: Executive Director
                                      ------------------------------------------



<PAGE>   15
                                   Schedule 3



Medical benefits and other employee benefits will be billed to IDRI in the
amount charged to Corixa by Group Data, Inc., including any adjustments.

Rent will be billed based on the number of square feet directly occupied by
IDRI, plus prorata share of the designated common areas. Rent will be based on
the base rent charged to Corixa plus additional rent amounts charged to Corixa
in accordance with their lease, plus charges for overhead items such as
utilities, copiers, telephone and fax services, library services, mailroom and
other overhead items.

The insurance premiums paid by Corixa will be charged to IDRI based on the
number of square feet calculated for rental of space.

IDRI will pay Corixa for its share of usage of equipment and maintenance by
paying a percentage of the depreciation expense and maintenance of Corixa based
on the relative headcounts of each company.

Other support services include administrative support, laboratory and facilities
support and direct supplies consumed by IDRI. Administrative, laboratory and
facilities support will billed as a headcount percentage of the overhead amount
incurred by Corixa no billed under a category defined above for Corixa'
non-scientific departments. Direct supplies will be billed as a percentage based
on the relative scientific headcount of both companies of the supplies expenses
in the research and development departments.



<PAGE>   16
                                 Schedule 5.1(a)

                             1997 Payment Schedule:

             [***] payable in equal quarterly installments of [***]

<PAGE>   1
                                                                   EXHIBIT 10.26

                   AMENDED AND RESTATED RESEARCH SERVICES AND
                         INTELLECTUAL PROPERTY AGREEMENT


                  This Amended and Restated Services and Intellectual Property
Agreement (this "Agreement") is effective as of January 1, 1997 (the "Effective
Date") by and between Corixa Corporation ("Corixa"), a Delaware corporation, and
Infectious Disease Research Institute ("IDRI"), a Washington not-for-profit
corporation.

                  WHEREAS, Corixa and IDRI are parties to that certain Research
Services and Intellectual Property Agreement dated as of September 29, 1994 (the
"Prior Agreement");

                  WHEREAS, IDRI has been established as an independent institute
for the purposes of engaging in research related to infectious disease and such
other research as may be determined by IDRI pursuant to the direction of its
independent Management Board; and

                  WHEREAS, Corixa desires to continue to sponsor certain
research of IDRI and enjoy all ownership and similar rights in and to certain
Inventions (as defined below) that result from the continued performance of IDRI
research (except as limited herein), and IDRI continues to desire to receive
funding in exchange for the performance of such research and the enjoyment of
such rights.

                  WHEREAS, Corixa and IDRI each, desire to terminate the Prior
Agreement in its entirety and accept the rights and obligations created pursuant
hereto in lieu of the rights and obligations under the Prior Agreement.

                  NOW, THEREFORE, in consideration of the mutual promises set
forth herein and other good and valuable consideration, the parties agree as
follows:


1.                DEFINITIONS

                  As used in this Agreement, the following terms shall have the
meanings indicated:

                  1.1 "Affiliate" as applied to Corixa shall mean any company,
partnership, joint venture, trust or other legal entity or organization in
whatever country organized, that controls, is controlled by or is under common
control with Corixa. The term "control" means possession, direct or indirect, of
the power to direct or cause the direction of management and policies whether
through the ownership of voting securities, by contract or otherwise.

                  1.2 "Agreement Year" shall mean the twelve (12) month period
beginning on January 1, 1997, and each subsequent twelve (12) month period
thereafter.

                  1.3 "Course of Work for IDRI" shall mean (i) in the
performance of scientific or technological work for or on behalf of IDRI, or
(ii) using the time, materials or facilities of IDRI or Corixa.

                  1.4 "Field of Research" shall mean scientific research
produced in the Course of Work for IDRI relating to antigen discovery for use in
infectious disease vaccines and diagnostics.

                  1.5 "IDRI Material" shall mean any substance, composition,
biological material or other material that is discovered, conceived, reduced to
practice, produced, developed or derived by an Investigator in the Course of
Work for IDRI.


<PAGE>   2

                  1.6 "Information" shall mean any data, formulas, know-how,
technical information, process information or other information that is produced
by an Investigator in the Course of Work for IDRI.

                  1.7 "Invention(s)" shall mean any process, use, article of
manufacture, composition of matter or apparatus, whether or not patentable, that
is made, developed, conceived or first actually or constructively reduced to
practice (in whole or in part) by an Investigator (either alone or jointly with
others) in the Course of Work for IDRI.

                  1.8 "Investigator" means (i) any member of IDRI's professional
staff or any IDRI employee who is involved in scientific or technological work
or who may be reasonably expected to develop Information, Inventions or IDRI
Material, or (ii) a person who works at IDRI and is involved in scientific or
technological work or is reasonably expected to develop Information, Inventions
or IDRI Material, or (iii) any person who performs scientific or technological
work for or on behalf of IDRI.

                  1.9 "Net Sales" of a product shall mean all revenues actually
received by Corixa or any Affiliate with respect to transfer of the product to a
person or entity that is not an Affiliate, less (i) any allowances actually made
and taken for returns; shipping and insurance costs actually paid; cash
discounts actually allowed in amounts and for purposes customary in the trade;
sales, use, value-added and similar taxes and duties and similar governmental
assessments (on products as shipped); provided such amounts would otherwise have
been included in "Net Sales."

                  1.10 "Patent Right(s)" shall mean all United States patent
applications, including all divisions, continuations and continuations-in-part
thereof, and all foreign patent applications or the equivalent thereof, and all
Letters Patent or the equivalent thereof issuing thereon, and all reissues,
re-examinations and extensions thereof, insofar as they contain, represent or
assert one or more claims to an Invention.

                  1.11 "Director of IDRI" shall mean that person appointed by
the IDRI Management Board as Executive Director of IDRI, and such person's
successors as appointed from time to time by the IDRI Management Board.

                  1.12 "Research Services" shall mean any research conducted by
an Investigator in the Field of Research that is funded by Corixa pursuant to
Section 5 below, whether or not such research is conducted during normal
business hours or on the premises of IDRI.

                  1.13 The use herein of the plural shall include the singular,
and the use of the masculine shall include the feminine.

2.                TERM; RENEWAL

                  2.1 Initial Term. The initial term of this Agreement shall be
from the Effective Date until December 31, 1999, unless this Agreement is
earlier terminated pursuant to Section 16 hereof.

                  2.2 Renewal. Upon the expiration of the initial term described
in Section 2.1 above, this Agreement may be renewed at the sole discretion of
Corixa for one or more additional three (3) year terms.
<PAGE>   3
3.                SERVICES PROVIDED BY CORIXA TO IDRI

                  Subject to the provisions of this Agreement, and upon IDRI's
reasonable request, Corixa agrees to perform for IDRI the following services
(collectively, "IDRI Services"):

                  3.1 Medical Benefits. Corixa shall provide the employees of
IDRI medical (including vision) insurance benefits substantially similar to
those benefits offered, from time to time, by Corixa to Corixa's own employees;
it being understood that IDRI shall be responsible for payment in full for such
benefits. Corixa's monthly costs of providing such medical insurance benefits
and therefore the amounts to be billed to IDRI shall be in accordance with
Schedule 3 as amended from time to time and shall include all costs incurred in
setting up such medical benefits and all costs incurred by Corixa in maintaining
such medical benefits, including but not limited to the payment of any premiums
required.

                  3.2 Other Employee Benefits. Corixa shall, at IDRI's option,
provide to the employees of IDRI dental insurance benefits, disability benefits,
and benefits under any life and accidental death and dismemberment plan, and
occupational health services plan, substantially similar to the benefits
provided, from time to time, by Corixa to Corixa's own employees; it being
understood that IDRI shall be responsible for payment in full for such benefits
in accordance with Schedule 3 as amended from time to time. IDRI employees shall
not participate in Corixa's 401(k) benefits plan, IRC Section 125 flexible
benefit plan, profit sharing, key person, executive bonus, or any other employee
benefit programs.

                  3.3 Biomedical Research Facilities. Corixa shall provide to
IDRI reasonable biomedical research space at Corixa's facilities leased from
Health Science Properties, Inc., 1124 Columbia Street, Suite 200,
Seattle,Washington 98104 (the "Research Space"). Corixa shall bill IDRI in
accordance with Schedule 3 for such Research Space, which amount shall be
adjusted by Corixa and IDRI from time to time pro rata to reflect future changes
in the percentage and cost to Corixa of Corixa's facilities at 1124 Columbia
Street, Suite 200, Seattle, Washington 98104 used by IDRI.

                  3.4 Biomedical Research Facility Services. Corixa shall
provide to IDRI facility services at Corixa's facilities from Health Science
Properties, Inc., in 1124 Columbia Street, Suite 200, Seattle, Washington 98104
including: utilities; use of copiers, telephones and facsimile machines; library
services; and mail room services. All services provided to IDRI pursuant to this
Section 3.4 shall be charged to IDRI in accordance with Schedule 3 as amended
from time to time which charges shall be at the same rate charged to Corixa by
the facility or third party service providers.

                  3.5 Equipment Sharing. Each of IDRI and Corixa shall allow the
other the reasonable use of certain scientific and computer equipment from time
to time as reasonably requested, subject in all cases to each party's right to
limit access based upon its own demand for such equipment. Corixa and IDRI agree
that the vast majority equipment provided by Corixa and any use of IDRI's
equipment by Corixa is minor. IDRI shall pay Corixa for the maintenance and cost
of the equipment as provided for in Schedule 3 as amended from time to time.


                  3.6 Insurance. IDRI shall be covered by Corixa's casualty and
property insurance and shall pay a pro rata portion of Corixa's direct charges
for premiums based on the percentage of Corixa's facilities utilized by IDRI.
IDRI's charge for such premiums shall be in accordance with Schedule 3 and shall
be adjusted by Corixa and IDRI from time to time in accordance with changes in
Corixa's premiums and the amount of research space occupied by IDRI. IDRI made
an initial payment of $1,320 upon execution of the Prior Agreement.

                  3.7 Other Services and Supplies. Corixa may also provide to
IDRI, at Corixa's sole discretion, other services requested from time to time by
IDRI, including reasonable secretarial, administrative, and laboratory and
facility support services, including IDRI's allocated share of any directly
consumed supplies. IDRI's charge for such services and supplies shall be in
accordance with Schedule 3 as amended from time to time Corixa shall determine
the method of determining Corixa's costs for such other services which in no
event shall be more than the fair market value of such services from third party
service providers.
<PAGE>   4

                  3.8 Services Period. Corixa provided the IDRI Services
throughout the term of the Prior Agreement. Corixa shall continue to provide the
IDRI Services, commencing January 1, 1997 and ending on December 31, 1999 (the
"IDRI Services Period"). The IDRI Services Period shall automatically be renewed
and extended for periods of one (1) year, unless either Corixa or IDRI gives at
least one (1) month prior written notice to such other party to terminate the
provision by Corixa of all or any part of the IDRI Services, in which case the
IDRI Services Period shall be renewed and extended only with respect to the IDRI
Services that are not so terminated.

4.                PAYMENT FOR IDRI SERVICES

                  4.1 Payments.

                  (a) IDRI paid to Corixa [***] upon execution of the Prior
Agreement, which amount was allocated as follows: [***] to payment of rent on
the Research Space for the period ending on December 31, 1994; [***] for the
then applicable insurance premium payment pursuant to Section 3.6 and the
remaining [***] was credited against future amounts payable by IDRI for IDRI
Services.

                  (b) Before the end of each calendar quarter, Corixa and IDRI
shall agree upon the amounts to be paid to Corixa for IDRI Services to be
performed during the subsequent calendar quarter, which shall include a pro rata
adjustment for any additional research space to be leased by IDRI. A description
of the amounts of such payments for each subsequent calendar quarter shall be
attached as Schedule 3 to this Agreement which Schedule may be amended from time
to time by prior written agreement of the parties.

                  4.2 Timing of Payments. The amounts required to be paid to
Corixa for IDRI Services in accordance with Schedule 3 shall be invoiced by
Corixa at the end of each month. IDRI shall pay each such invoice no later than
twenty (20) days after its receipt. IDRI shall pay Corixa interest at a rate of
one percent (1%) per month (calculated pro-rata for any portion of a month) on
any amounts not paid within such time.

5.                FUNDING FOR RESEARCH SERVICES

                  5.1 Payments. In return for Research Services and the
ownership of certain intellectual property rights provided in this Agreement,
Corixa shall pay to IDRI the following amounts at the times set forth in Section
5.2 below:

                  (a) During the first Agreement Year, subject to the deferral
provisions set forth in Section 5.3 below, Corixa shall pay to IDRI the amount
set forth on Schedule 5.1 (a) hereto, as amended by prior written agreement of
the parties from time to time, to reflect the amount and terms of payment agreed
to by the parties in connection with Section 5.1(b) for Research Services to be
provided during such period.

                  (b) No later than thirty (30) days prior to the end of any
Agreement Year, a committee composed of the Director of IDRI, a member of the
Management Board of IDRI, the Chief Executive Officer of Corixa and the Director
of Antigen Discovery of Corixa shall create an annual research plan (each, a
"Research Plan") with respect to Research Services to be provided during the
subsequent Agreement Year. Each such Research Plan shall include a description
of the amounts and the terms of payments for Research Services for each
subsequent Agreement Year as well as the scope and focus of the Research
Services to be provided and shall be subject to the review and approval of
senior management of Corixa. Each Research Plan shall be attached as an addendum
to this Agreement. The initial Research Plan is attached hereto.

                  5.2 Timing of Payments. The amount required to be paid to IDRI
in any Agreement Year as provided in Section 5.1 above shall be paid in four (4)
equal quarterly installments on

<PAGE>   5



January 31, April 30, July 31 and October 31 of such Agreement Year, unless such
date shall not be a business day, in which case payment shall be made on the
first business day after such date. The first installment shall be paid on
January 31.

                  5.3 Deferral of Payments. Corixa shall defer all or part of
any quarterly or annual payment otherwise required to be made pursuant to
Section 5.1 above to any future quarter or year as shall be specified by IDRI,
upon submission by IDRI of a written request for such deferral prior to the date
on which IDRI is entitled to such payment.

                  5.4 Other Funding Sources. IDRI shall have the right to
conduct research in any area, whether or not related to Research Services, in
addition to Research Services and, subject to the terms of Section 7 hereof,
IDRI shall own all patent rights and other ownership rights with respect to any
intellectual property arising from such research. Any additional funding
obtained by IDRI pursuant to this Section 5.4 shall not reduce Corixa's
obligation to make the funding payments provided under Section 5.1 hereof.

6.                PATENTS, INVENTIONS, INFORMATION AND IDRI MATERIAL

                  6.1 Assignment of Rights.


                  (a) IDRI agrees to assign and hereby assigns all of its
rights, title and interest in and to any Invention(s) and Patent Rights to
Corixa.

                  (b) IDRI shall cooperate with Corixa in the preparation,
filing, prosecution, maintenance, assignment and enforcement of any Invention(s)
and Patent Rights, and shall perform all necessary acts relating thereto,
including without limitation, executing, acknowledging and delivering any and
all papers, documents and instruments required for effecting such prosecution,
maintenance assignment and enforcement; provided, however, that Corixa shall pay
all costs incurred by IDRI in complying with the requirements of this Section
6.1(b).

                  6.2 Patent Rights Policy. An overall policy with respect to
the filing of Patent Rights for presentation to the senior management of Corixa
shall be created by a committee composed of the Director of IDRI, the Chief
Executive Officer of Corixa and the Director of Antigen Discovery of Corixa.
Corixa shall pay all of the costs for prosecution and maintenance of such Patent
Rights using patent counsel of its choice.

                  6.3 Development Policy.

                  (a) Corixa undertakes, consistent with its business plans, to
use Inventions, Information, IDRI Material and Patent Rights diligently for the
benefit of society, licensing to others those Patent Rights under which it
cannot develop a commercial product or service within a reasonable period of
time or which fall outside its areas of interest. Corixa may waive these
guidelines at the request of IDRI when, in their combined judgment, there is a
compelling benefit to society in doing so. As a general policy, Corixa believes
society is best served by rapidly identifying and protecting Inventions, but
Corixa shall undertake to judge each case individually in consultation with
IDRI.

                  (b) In the event that IDRI believes that there are certain
Patent Rights (i) that fall outside Corixa's areas of interest, (ii) that
concern technology that is not currently, or in the future likely to be,
competitive with the business or products of the Company and (iii) with respect
to which a third party has expressed or may express interest in
commercialization, then, in further consideration of the License granted in
Section 7.2, IDRI shall have the right to request Corixa to review in good faith
its intentions with respect to the development of a product or products related
to such Patent Rights for a period of ninety (90) days. If after such ninety
(90) day period, Corixa reasonably concludes that it does not intend to proceed
with the development of a product or products or service or services related to
such Patent Rights, then Corixa shall enter into an agreement with IDRI
relinquishing its rights to such Patent Rights (in whole or in part) as Corixa,
in its sole discretion, deems appropriate in light of the combined interest of
society, IDRI and Corixa. This Section 6.3(b) shall not apply to any Patent
Rights arising from 
<PAGE>   6

or related to the Research Services and shall not require Corixa to take any
action which it in good faith believes would undermine its competitive position.

                  6.4 Investigator Agreements. As a condition to engaging or
employing an Investigator, IDRI shall enter into a written agreement with each
Investigator that shall provide the Investigator shall: (i) promptly report to
IDRI any Invention made by the Investigator (either alone or jointly with
others); (ii) assign all his/her rights, title and interest in and to Inventions
and Patent Rights to IDRI; (iii) cooperate with IDRI and Corixa in the
preparation, filing, prosecution, maintenance, assignment and enforcement of any
Invention or Patent Right; (iv) comply with the obligations set forth in Section
8.4 below; and (v) perform all acts and sign, execute, acknowledge and deliver
any and all papers, documents and instruments required for effecting the
obligations and purposes of this Agreement.

                  6.5 Right to Use Information and IDRI Material. IDRI grants to
Corixa a fully paid-up, royalty-free, worldwide, perpetual, noncancellable
exclusive right and license to use and to sublicense or transfer to third
parties Information and IDRI Material.

7.                INTELLECTUAL PROPERTY NOT RELATED TO RESEARCH SERVICES

                  7.1 Funding from U.S. Government and Non-Profit Organizations.
Subject to the obligation of Section 7.2, IDRI shall be permitted to enter into
agreements with agencies, departments or instrumentalities of the United States
government and non-profit organizations, foundations and similar organizations
(including but not limited to the National Institutes of Health, the World
Health Organization and the National Institute of Allergy and Infectious Disease
and similar organizations) ("Organizations") for funding of research at IDRI
which prevents IDRI from assigning all rights, title and interest to Corixa in
and to inventions and patent rights which result from such funding (each
agreement an "Organization Agreement" and each such invention and patent right
an "Organization Invention" and "Organization Patent Right," respectively).

                  7.2 Exclusive License.

                  (a) IDRI hereby grants to Corixa and Corixa hereby accepts
from IDRI a worldwide, perpetual, noncancellable right and license to make, have
made, use and sell or have sold on its behalf any product, service, process,
machine, apparatus or article of manufacture or composition, including the right
to sublicense to third parties, pursuant to the terms and conditions of this
Agreement, under any Organization Invention or Organization Patent Right in
which ownership must be retained by IDRI or in which the Organization does not
permit ownership to be retained by Corixa pursuant to any Organization
Agreement. This license is granted to the extent permitted under United States
law and is exclusive except as to the United States government or other
Organization, which may retain a non-exclusive royalty-free license under such
Organization Inventions and Organization Patent Rights. Corixa at its cost and
expense shall file, prosecute and maintain Organization Patent Rights licensed
under this Section 7.2 using patent counsel of its choice.

                  (b) With respect to the Organization Patent Rights licensed to
Corixa under Section 7.2(a), Corixa shall pay to IDRI a running royalty of
[***]% of net sales of any product sold by Corixa which is covered by an
unexpired, valid claim of an Organization Patent Right in the country in which
such product is made, used or sold; provided, however, that with respect to any
antigen licensed hereunder, such royalty shall be payable only with respect to
the first Corixa product incorporating such antigen.

                  (c) In the event that Corixa is obligated to pay a royalty for
a product to a party other than an Affiliate ("Other Party Royalty") for which
product a royalty is owed to IDRI, then [***] of such Other Party Royalty shall
be fully creditable against the royalty owed to IDRI under this Section 7.2 of
this Agreement.

                  (d) No royalty shall be due or payable under this Section 7.2
with respect to any product for which a royalty is paid under Section 16.4 of
this Agreement.
<PAGE>   7
8.                OBLIGATIONS OF IDRI

8.1 Conduct of Research. IDRI shall use directly or indirectly the funds paid by
Corixa pursuant to Section 5 hereof to perform research in the Field of Research
and may apply the funds for and in such amounts and at such times and such
specific purposes and for such uses as it shall deem necessary or appropriate to
further such research, including without limitation to pay salaries, purchase
equipment and to pay other direct and indirect costs associated with such
research.

8.2 Disclosure. During the term of this Agreement, and thereafter while IDRI is
conducting Research Services, IDRI shall:

         (a) promptly and systematically disclose to Corixa significant
developments relating to the discovery of Information, Inventions and IDRI
Material;

         (b) for the purpose of facilitating disclosure to Corixa of
Information, Inventions and IDRI Material, permit duly authorized employees or
representatives of Corixa to visit Investigators' laboratories at IDRI or other
IDRI facilities, at reasonable times and with reasonable notice; and

         (c) at Corixa's reasonable request, provide Corixa with reasonable
quantities of IDRI Material.

8.3 Periodic Reporting. IDRI shall, on a continuing basis, advise Corixa of the
results of research being performed at IDRI, and at least once every three (3)
months provide Corixa with a written progress report concerning such research.

8.4 Publishing Limitations. At any time during or after the term of this
Agreement, IDRI may publish, submit for publication or otherwise provide to or
exchange with any person or entity any previously unpublished Information,
Inventions or IDRI Material; provided, however, that IDRI agrees, and shall
cause each Investigator to agree prior to his/her becoming an Investigator, not
to publish, submit for publication or otherwise exchange any previously
unpublished Information, Inventions or IDRI Material without the express written
consent of Corixa (which consent shall not be unreasonably denied), until the
earlier of (i) thirty (30) after IDRI has satisfied its obligation under Section
8.2(a) above with respect to such Information, Invention or IDRI Material or
(ii) Corixa having filed for patent protection with respect thereto.
Notwithstanding the foregoing, if requested in writing by Corixa, IDRI agrees
not to publish, submit for publication or otherwise exchange any previously
unpublished Information, Invention or IDRI Material specifically designated by
Corixa for a period of up to three (3) months after disclosure thereof to Corixa
pursuant to Section 8.2(a) above provided that such Information, Invention or
IDRI Material is potentially useful for discovering a cure or treatment for a
disease if such additional time is for the purpose of (a) completing filing of
patent applications relating thereto, or confirming biological activity of a
material encompassed thereby, or (b) completing sequencing of a material
encompassed thereby, or expressing a protein encompassed thereby; provided
further that, such three (3) month period may be extended to six (6) months,
(i.e., an additional three (3) months) if such Invention, Information or IDRI
Material otherwise meets the requirements for extension to six (6) months and
relates to a product which Corixa or its licensee(s) intends to commercially
develop.

8.5 Intellectual Property Safeguards. Within thirty (30) days of the execution
of the Prior Agreement, IDRI established appropriate policies with respect to
the safeguarding of intellectual property, including but not limited to
Information, Inventions, IDRI Materials and other data, formulas, know-how,
biological materials and/or other information related to the research being
conducted by IDRI. Such policies shall continue to be subject to the reasonable
review and approval of Corixa, and shall continue to include an obligation that
each Investigator, employee or consultant of IDRI enter into an appropriate
agreement with IDRI with respect to such safeguarding of intellectual property.
<PAGE>   8
9.       OBLIGATIONS OF CORIXA

                  9.1 Grant of License. Notwithstanding any other provision in
this Agreement, Corixa hereby grants to IDRI a worldwide, perpetual,
noncancellable, nonexclusive, royalty-free right and license under all
Inventions and Patent Rights only for the purpose of conducting non-commercial
research; provided, however, that IDRI shall not assign, sublicense or otherwise
transfer any or all of its interest in such license to any other person or
entity without the prior written consent of Corixa. Any assignment, sublicense
or other transfer by IDRI in violation of this Section 9.1 shall be void and
without effect.

                  9.2 Limitation on Assignment of Patent Rights. Corixa shall
not assign ownership to Patent Rights obtained from IDRI under this Agreement to
another entity without the written consent of IDRI, which consent shall not be
unreasonably withheld or delayed, except such consent shall not be required: (i)
where such assignment is in conjunction with a transfer of all or substantially
all of the business, stock or assets of Corixa to an entity that is not an
Affiliate of Corixa; or (ii) where such assignment is to an Affiliate that is a
majority-owned subsidiary of Corixa. For the purposes of this Section 9.2, the
granting of a non-exclusive or exclusive license under Patent Rights shall not
be an assignment.

10.               REDUCTIONS IN ROYALTIES

                  10.1 Reduction Based on Multiple Antigens. If it is necessary
for Corixa to obtain licenses to antigens from third parties that are used in
any particular product in combination with antigens licensed under this
Agreement, then the percentage royalty rate on Net Sales of such product under
Sections 7.2 and 16.4 shall be reduced on a pro rata basis along with royalties
to be paid to such third parties with respect to such product based on the
number of antigens so used; provided, however, that, except as otherwise set
forth in the provisionsto Sections 7.2(b) and 16.4(c) respectively, in no event
shall IDRI be entitled to royalties consisting of less than [***]% of Net Sales
for any such product; and provided further, that in no event shall IDRI be
entitled to royalties on any product consisting of more than [***]% of Net Sales
for any such product.

                  10.2 Reduction in the Event of Infringement. During the term
of an infringement action relating to the Patent Rights, royalties under
Sections 7.2 and 16.4 shall accrue, but shall not be payable by Corixa until the
final dispensation of such action, either by settlement or final adjudication.
In the event of a settlement pursuant to which Corixa is required to pay a third
party as a result of infringement, Corixa shall have the right to offset such
deferred royalties to pay such settlement and in addition shall have the right
to reduce by [***]% future royalties payable under Sections 7.2 and 16.4 until
such settlement is paid in full.

11.               CONFIDENTIALITY

11.1 Nondisclosure. During the term of this Agreement, it is contemplated that
Corixa shall disclose to IDRI and Investigators proprietary and confidential
technology, inventions, technical information, biological materials, business
information, product development information and the like which are owned or
controlled by Corixa or which Corixa is obligated to maintain in confidence and
which are designated by Corixa as confidential ("Corixa Confidential
Information"). Except as otherwise provided in this Agreement, IDRI agrees to
retain such Corixa Confidential Information in confidence and not to use (except
as provided in this Agreement) or disclose any such Corixa Confidential
Information to a third party without the prior written consent of Corixa. For
purposes of this Section 11 and without limiting the generality of the
foregoing, Corixa Confidential Information shall include all information
relating to the lease agreements each party hereto entered into with the Fred
Hutchinson Cancer Research Center, and Corixa and IDRI each agree to maintain in
confidence and not disclose the terms and conditions of such lease agreements.



<PAGE>   9

11.2 Exceptions. The obligations of IDRI pursuant to Section 11.1 hereof shall
not apply to Corixa Confidential Information that:

     (a) is known to IDRI or generally known to the public prior to its
disclosure hereunder; or

     (b) becomes known to the public by some means other than a breach of this
Agreement, including publication and/or laying open to inspection of any patent
applications or patents; or

     (c) is disclosed to IDRI by a third party having a lawful right to make
such disclosure, and who is not under any obligation of confidentiality to
Corixa; or

     (d) is required to be disclosed to a governmental entity or agency or
pursuant to the lawful requirement or request of a governmental entity or
agency.

11.3 IDRI Information. Corixa agrees not to disclose to a third party
Information, Inventions and IDRI Material disclosed to Corixa by IDRI or an
Investigator, except under an obligation of confidentiality. Corixa's obligation
under this Section 11.3 with respect to any Information, Inventions or IDRI
Material shall terminate one (1) year after disclosure thereof to Corixa
(provided that such period shall be extended to eighteen (18) months in the case
of any Information, Inventions or IDRI Material which IDRI is prevented from
publishing pursuant to Section 8.4 above). The foregoing obligation shall not
apply to any Information, IDRI Material or Invention which:

(a) is known to Corixa or generally known to the public prior to its disclosure
hereunder; or

(b) becomes known to the public by some means other than a breach of this
Agreement, including publication and/or laying open to inspection of any patent
applications or patents; or

(c) is disclosed to Corixa by a third party having a lawful right to make such
disclosure, and who is not under any obligation of confidentiality to IDRI; or

(d) is required to be disclosed to a governmental entity or agency or pursuant
to the lawful requirement or request of a governmental entity or agency.

12. WARRANTIES

                  12.1 Authority. Each of IDRI and Corixa hereby warrants and
represents to the other that it has the full right and authority to enter into
this Agreement.

13. INDEMNIFICATION 

                  13.1 Obligation of Corixa to Indemnify. Each party shall
promptly notify the other upon receiving notice of any claim, lawsuit or other
proceeding relating to a product or process that incorporates or is manufactured
by use of any Invention, Information, IDRI Material or Patent Right. Corixa
agrees that it shall indemnify and hold harmless IDRI and all Investigators, and
other members, researchers, employees, officers and trustees of IDRI, and each
of them (each an "Indemnified Party") from and against any and all third party
claims, causes of action and costs (including reasonable attorney's fees and
costs of appearing as witnesses or otherwise preparing to defend any such claim
or cause of action) of any nature made or lawsuits or other proceedings filed or
otherwise instituted against any Indemnified Party or Parties arising out of
Corixa's design, manufacture, sale or use of any such product or process;
provided, however, that Corixa shall not indemnify any Indemnified Party from or
against any claims, causes of action or costs that result from the recklessness,
gross negligence or willful misconduct of such Indemnified Party (except to the
extent that any act of patent infringement is by its terms considered willful,
in which case Corixa shall indemnify any Indemnified Party); provided, further,
that Corixa shall not provide indemnification to any Indemnified Party for any
amount exceeding in the aggregate the coverage limitations of Corixa's then
existing applicable insurance policy. IDRI shall 
<PAGE>   10
promptly notify Corixa of any such claim. Corixa may elect to assume the defense
of any claim, lawsuit, or other proceeding identified in this Section3, but IDRI
and/or any Indemnified Party may retain additional counsel and assume the
defense of such suit if (i) Corixa specifically authorizes the retaining of such
counsel and assumption of such defense or (ii) IDRI or any Indemnified Party has
been advised by counsel that one or more legal defenses may be available to it
which may not be available to Corixa, in which case Corixa shall not be entitled
to assume the defense of such suit, notwithstanding its obligation to bear the
reasonable fees and expenses of counsel to IDRI or any Indemnified Party. In the
event that any Indemnified Party elects to assume the defense of any suit and
retain counsel as permitted herein, in no event shall Corixa be responsible for
the fees and expenses of more than one (1) additional counsel for each such
Indemnified Party or for any settlement or compromise that Corixa has not
approved in writing. Subject to the foregoing, Corixa shall have the right to
control the defense, settlement or compromise of any claim which is indemnified
hereunder.

14. ASSIGNMENT; SUCCESSORS

                  14.1 Written Consent Required. Subject to Section 9.2 above,
this Agreement shall not be assignable by either of the parties without the
prior written consent of the other party, which consent shall not be
unreasonably withheld or delayed; provided, however, that Corixa may assign this
Agreement without the consent of IDRI (i) pursuant to a transfer or sale to an
entity other than an Affiliate of all or substantially all of Corixa's stock
business or assets to which this Agreement relates, or a consolidation or merger
of Corixa with or into any other entity, or any other corporate reorganization
in which Corixa is not the continuing or surviving entity of such consolidation,
merger or reorganization, or any transaction or series of related transactions
by Corixa in which in excess of fifty percent (50%) of Corixa's voting power is
transferred, or (ii) to a wholly-owned subsidiary. Any assignment in violation
of this Section 14.1 shall be void and without effect.

                  14.2 Successors and Assigns. Subject to the limitations on
assignment set forth herein, this Agreement shall be binding upon and inure to
the benefit of said successors in interest and assigns of Corixa and IDRI. Any
such successor or assignee of a party's interest shall expressly assume in
writing the performance of all the terms and conditions of this Agreement to be
performed by said party.

15. SUSPENSION OF FUNDING AND RESEARCH SERVICES

                  15.1 Upon Material Breach by IDRI. Upon material breach of any
material provision of this Agreement by IDRI, in the event the breach is not
cured within sixty (60) days after written notice to IDRI by Corixa, in addition
to any other remedy it may have, Corixa may suspend further funding under this
Agreement until the breach is cured. Suspension of payments by Corixa as
permitted by this Section 15.1 shall not permit IDRI to terminate this Agreement
under Section 16.1 below.

                  15.2 Upon Material Breach by Corixa. Upon material breach of
any material provision of this Agreement by Corixa, in the event the breach is
not cured within sixty (60) days after written notice to Corixa by IDRI, in
addition to any other remedy it may have, IDRI may suspend the research work on
behalf of Corixa in the Field of Research of this Agreement until such breach is
cured; provided that such suspension shall not affect assignment or rights by
operation of this Agreement. Suspension of research work in the Field of
Research by IDRI as permitted by this Section 15.2 shall not permit Corixa to
terminate this Agreement under Section 16.2 below.

16. TERMINATION

                  16.1 IDRI's Right to Terminate.

                  (a) Subject to Section 15.1 hereof, IDRI may terminate this
Agreement upon sixty (60) days written notice to Corixa if Corixa fails to make
a payment required hereunder; provided,
<PAGE>   11
however, that such termination shall not take effect if Corixa makes the payment
prior to expiration of such sixty (60) day period.

                  (b) IDRI may terminate this Agreement immediately, upon
written notice to Corixa, if Corixa materially breaches any other provision
hereof, and fails to cure such breach within sixty (60) days after receiving
written notice from IDRI specifying the precise nature of the breach.

                  (c) IDRI may terminate this Agreement, upon thirty (30) days
prior written notice to Corixa, in the event that Corixa becomes insolvent,
voluntarily files for bankruptcy or reorganization, or makes a general
assignment in favor of creditors, or if bankruptcy proceedings are commenced
against Corixa (and not dismissed within ninety (90) days).

                  (d) IDRI's ability to terminate this Agreement pursuant to
this Section 16.1 shall not be its exclusive remedy, but shall be in addition to
any other remedy available to it at law or in equity.

                  16.2 Corixa's Right to Terminate.

                  (a) In the event the Director of IDRI is no longer available,
willing or able to continue directing research at IDRI, IDRI shall promptly
notify Corixa and may nominate a replacement reasonably satisfactory to Corixa;
provided, however, if IDRI does not nominate a replacement who is reasonably
satisfactory to Corixa within sixty (60) days of such notice, Corixa may
terminate this Agreement upon three (3) months written notice to IDRI.

   
                  (b) Corixa may at its sole option terminate this Agreement
upon three (3) months written notice to IDRI if the aggregate funding obtained
by IDRI from sources other than Corixa is an amount less than One Hundred Fifty
Thousand Dollars ($150,000) for any one Agreement Year.
    

                  (c) Subject to Section 15.2 above, Corixa may terminate this
Agreement immediately, upon written notice to IDRI, if IDRI materially breaches
any provision hereof, and fails to cure such breach within sixty (60) days after
receiving written notice from Corixa specifying the precise nature of the
breach.

                  16.3 Survival. The rights and obligations of the parties set
forth in Sections 6 through 11,13 16.4 and in this Section 16.3, shall survive
the expiration or termination of this Agreement for any reason, and shall
continue in effect until by their terms they are no longer applicable.


                  16.4 Invention and Patent Rights After Termination.

                  (a) In the event this Agreement is terminated for any reason
whatsoever, including but not limited to expiration of the term of this
Agreement, IDRI shall not be obligated to assign to Corixa an Invention and
corresponding Patent Rights that were not conceived or actually or
constructively reduced to practice prior to such termination, unless such
Invention is conceived or actually or constructively reduced to practice within
six (6) months after such termination.

                  (b) Subject to Section 16.4(a) above, termination of this
Agreement for any reason whatsoever shall not affect Corixa's ownership interest
in Inventions and corresponding Patent Rights which Inventions are conceived or
actually or constructively reduced to practice prior to termination.

                  (c) In the event that this Agreement is terminated by IDRI
under the provisions of Section 16.1(a) above, then with respect to Patent
Rights to which Corixa retains an ownership interest under this Agreement,
Corixa shall pay IDRI a running royalty of [***] of net sales of any product
sold by Corixa or a sublicensee which is covered by an unexpired valid claim of
such a Patent Right in the country in which such product is made, used or sold;
provided, however, that with 

<PAGE>   12
respect to any antigen licensed hereunder, such royalty shall be payable only
with respect to the first Corixa product incorporating such antigen.

                  (d) In the event that Corixa is obligated to pay a royalty for
a product to a party other than an Affiliate ("Other Party Royalty") for which
product a royalty is also owed to IDRI, then [***] of such Other Party Royalty
shall be fully creditable against the royalty owed to IDRI under Section 16.4(c)
of this Agreement. In the event that ownership in any such Patent Right is
assigned by Corixa to another entity, Corixa shall obligate such entity to the
payment provisions of Section 16.4(c).


17. MISCELLANEOUS

                  17.1 Relationship of IDRI and Corixa. The relationship between
IDRI and Corixa is that of independent contractors. Except as otherwise provided
herein, IDRI and Corixa are not joint venturers, partners, principal and agent,
master and servant or employer and employee, and have no relationship other than
as independent contracting parties. Except as otherwise provided herein, IDRI
shall have no power to bind or obligate Corixa in any manner, and Corixa shall
have no power to bind or obligate IDRI in any manner. Notwithstanding any other
provision in this Agreement to the contrary, IDRI is and shall remain an
independent entity, operated under the supervision and direction solely of its
Management Board. This Agreement may be terminated by IDRI or Corixa at any time
pursuant to the terms of this Agreement and, except as otherwise provided
herein, IDRI and Corixa shall have no further obligation to each other.

                  17.2 Governing Law. This Agreement shall be governed by and
construed under the laws of the State of Washington as applied to agreements
among Washington residents entered into and to be performed entirely within the
State of Washington.

                  17.3 Entire Agreement. Except as provided in the next
sentence, this Agreement sets forth the entire agreement and understanding
between the parties as to the subject matter hereof and supersedes all prior
written or oral agreements relating to the subject matter hereof. There shall be
no amendments or modifications to this Agreement, except by a written document
which is signed by both parties.

                  17.4 Headings. The headings in this Agreement have been
inserted for the convenience of reference only and are not intended to limit or
expand the meaning of the language contained in any section hereof.

                  17.5 Delay or Waiver. Any delay in enforcing a party's rights
under this Agreement or any waiver as to a particular default or other matter
shall not constitute a waiver of such party's right to the future enforcement of
its rights under this Agreement, except as set forth in a written and signed
waiver as to a particular matter for a particular period of time.

                  17.6 Notices. Any notices given pursuant to this Agreement
shall be in writing and shall be deemed delivered upon (i) the date of delivery,
if personally delivered, (ii) three (3) business days after being mailed by
certified or registered mail, postage prepaid and properly addressed, with
return receipt requested, or (iii) the date of facsimile report, if sent by
facsimile and confirmed by certified or registered mail. Notices shall be
delivered to the respective parties as indicated below, or any other address
designated by a party to the other party in writing under the notice provisions
of this Section 17.6:

        To Corixa:                         Corixa Corporation
                                           1124 Columbia Street, Suite 200
                                           Seattle, WA  98104
                                           Attn:    Mark McDade
                                                    Chief Operating Officer


<PAGE>   13

        To IDRI:                           Infectious Disease Research Institute
                                           1124 Columbia Street, Suite 200
                                           Seattle, WA  98104
                                           Attn:  Director

                  17.7 Severability. If any provision of this Agreement is held
to be illegal or unenforceable, that provision shall be limited or eliminated to
the minimum extent necessary so that this Agreement shall otherwise remain in
full force and effect and enforceable.

                  17.8 Counterparts. This Agreement may be executed in one or
more counterparts, each of which shall be deemed an original, but all of which
taken together shall constitute one and the same instrument.



<PAGE>   14


IN WITNESS WHEREOF, each of the parties hereto has caused this Agreement to be
executed on its behalf, effective as of the date set forth above.

                               CORIXA CORPORATION



                               By: /s/ MARK McDADE
                                   ---------------------------------------------
                               Name: Mark McDade
                                     -------------------------------------------
                               Title: Chief Operating Officer
                                      ------------------------------------------

                               INFECTIOUS DISEASE RESEARCH INSTITUTE



                               By: /s/ DAVID G. WEBSTER
                                   ---------------------------------------------
                               Name: David G. Webster
                                     -------------------------------------------
                               Title: Executive Director
                                      ------------------------------------------



<PAGE>   15
                                   Schedule 3



Medical benefits and other employee benefits will be billed to IDRI in the
amount charged to Corixa by Group Data, Inc., including any adjustments.

Rent will be billed based on the number of square feet directly occupied by
IDRI, plus prorata share of the designated common areas. Rent will be based on
the base rent charged to Corixa plus additional rent amounts charged to Corixa
in accordance with their lease, plus charges for overhead items such as
utilities, copiers, telephone and fax services, library services, mailroom and
other overhead items.

The insurance premiums paid by Corixa will be charged to IDRI based on the
number of square feet calculated for rental of space.

IDRI will pay Corixa for its share of usage of equipment and maintenance by
paying a percentage of the depreciation expense and maintenance of Corixa based
on the relative headcounts of each company.

Other support services include administrative support, laboratory and facilities
support and direct supplies consumed by IDRI. Administrative, laboratory and
facilities support will billed as a headcount percentage of the overhead amount
incurred by Corixa no billed under a category defined above for Corixa'
non-scientific departments. Direct supplies will be billed as a percentage based
on the relative scientific headcount of both companies of the supplies expenses
in the research and development departments.



<PAGE>   16
                                 Schedule 5.1(a)

                             1997 Payment Schedule:

             [***] payable in equal quarterly installments of [***]

<PAGE>   1
                                                                   EXHIBIT 10.27

                                LICENSE AGREEMENT


     THIS AGREEMENT made this 20th day of November, 1995, by and between

                    HEALTH RESEARCH, INC.
                    Roswell Park Division
                    Elm and Carlton Streets
                    Buffalo, NY  14263

hereinafter referred to as "HRI", and

                    CORIXA CORPORATION
                    1124 Columbia Street
                    Suite 464
                    Seattle, WA  98104

hereinafter referred to as "LICENSEE":


                              W I T N E S S E T H:


         WHEREAS, Roswell Park Cancer Institute ("RPCI") is a research
institution operated under the control of the New York State Department of
Health, and

         WHEREAS, HRI pursuant to a contract with the New York State Department
of Health (C-002162) is responsible for the technology transfer programs of the
New York State Department of Health, and 

         WHEREAS, HRI is engaged in the conduct of research into the causes and
nature of disease at RPCI, and

         WHEREAS, HRI research developed a Murine Model for Human Carcinoma, and

         WHEREAS, the technology licensed herein was developed by Elizabeth A.
Repasky, Ph.D., Harvey Bumpers of RPCI, and


<PAGE>   2
                                       2


         WHEREAS, a U.S. Patent Application is to be filed in the names of
Elizabeth A. Repasky and Harvey Bumpers, all of the rights to be assigned to
and held by HRI, and

         WHEREAS, LICENSEE is engaged in the development of vaccines for the
treatment and prevention of specific malignancies and infectious diseases, and

         WHEREAS, LICENSEE wishes to acquire rights in and related to the U.S.
Patent Application to be filed and any and all corresponding patents.


         NOW, THEREFORE, in consideration of the promises and covenants herein
contained, the parties agree as follows:

ARTICLE I - DEFINITIONS

         The following definitions will control the construction of each of the
following terms used in this AGREEMENT. 

         1.1 "INVENTION" shall refer to claims in U.S. Patent Application to be
filed on the "Murine Model for Human Carcinoma".

         1.2 "LICENSED PATENT RIGHT" shall mean: 

                    1) Patent Application to be filed by or on behalf of HRI
                       titled "Murine Model for Human Carcinoma".

                    2) All patent applications which are divisions,
                       continuations, continuations-in-part, reissues, renewals,
                       foreign 

<PAGE>   3
                                       3


                       counterparts, extensions or additions of or to such
                       patent applications or patents, and all patents which may
                       issue thereon.

         1.3 "TECHNICAL INFORMATION" shall mean any unpublished and confidential
research and development information, unpatented inventions, know-how, trade
secrets or technical data in the possession of HRI prior to the effective date
of this AGREEMENT which relates to the INVENTION.

         1.4 "TERRITORY" shall mean all of the countries and territories of the
world.

         1.5 "FIELD" shall mean the practice of the INVENTION which employs
LICENSED PATENT RIGHTS or OTHER PRODUCT.

         1.6 "LICENSED PRODUCT" shall mean any and all products or processes
containing or developed using INVENTION which is sold commercially in the FIELD
in the TERRITORY, whose manufacture, use or sale is covered by a valid and
enforceable claim of an issued patent which is a LICENSED PATENT RIGHT.

         1.7 "OTHER PRODUCT" shall mean any and all products or processes
containing TECHNICAL INFORMATION or a product or process included in or
developed using INVENTION which is sold commercially in the FIELD in the
TERRITORY, whose manufacture, use or sale is not covered by a valid and
enforceable claim of an issued patent in the country of sale.

         1.8 "NET SALES" shall mean the sum of gross sales revenue sold by
LICENSEE or AFFILIATES less: transportation charges, trade class discounts and
rebates, quantity or cash discounts allowed or paid by LICENSEE or AFFILIATES;


<PAGE>   4
                                       4


credits or allowances given or made on account of returns or rejections of
previously delivered LICENSED PRODUCT or OTHER PRODUCT, insurance and sales or
excise taxes, and other governmental charges or duties imposed on the sale
import or export of LICENSED PRODUCT or OTHER PRODUCT. 

             If LICENSED PRODUCT or OTHER PRODUCT includes a combination of
antigens, some developed with technology covered under INVENTION and/or
TECHNICAL INFORMATION and some without, Net Sales for computing royalty payments
under this Agreement shall be determined by multiplying [***]

         1.9 "AFFILIATE" shall mean any company or other entity which controls,
is controlled by or is under common control with LICENSEE. A company or other
entity shall be presumed to control another if it owns at least fifty (50%)
percent of the outstanding voting equity or other assets of the company or
entity.

         1.10 "EFFECTIVE DATE" shall mean the day and year first above written.

         1.11 "EXCLUSIVE LICENSE" shall mean a worldwide license to make, have
made, use, sell, have sold LICENSED PRODUCT or OTHER PRODUCT whereby LICENSEE's
rights are sole and entire and operate to exclude all others, including HRI and
HRI's AFFILIATES, except that nothing herein shall restrict the right of HRI or


<PAGE>   5
                                       5


RPCI to continue research in INVENTION or TECHNICAL INFORMATION and/or the right
to use the same for teaching purposes at HRI or RPCI.

         1.12 "SUB-LICENSE AGREEMENT" shall mean an agreement complying with the
provisions and requirements of Section 3.4.1 hereof. 

         1.13 "SUB-LICENSEE" shall mean any company or other entity to whom
LICENSEE shall have granted a SUB-LICENSE AGREEMENT.


ARTICLE II - LICENSES

         2.1 - Exclusive License

         2.1.1 HRI hereby grants to LICENSEE in the FIELD in the TERRITORY an
EXCLUSIVE LICENSE to practice the INVENTION under the LICENSED PATENT RIGHT,
including the right to make, have made, use, sell and have products or processes
embodying the INVENTION, together with the right to so make, have made, use,
sell and have sold OTHER PRODUCTS.

         2.2 - Retentions

         2.2.1 No provision herein shall act so as to restrict the right of HRI,
RPCI or LICENSEE to seek and accept grants from governmental or not-for-profit
tax exempt organizations.


<PAGE>   6
                                       6


ARTICLE III - FEES, PAYMENTS, ROYALTIES, SUB-LICENSES AND

              DUE-DILIGENCE

         3.1 - Payments

         3.1.1 LICENSEE shall pay to HRI within the next calendar quarter a
portion of any and all sums, other than Royalties as provided in Section 3.2.
Such payments shall be made in keeping with the following schedule:

               LICENSEE Revenue                            Payment to HRI

               From [***] annual.                               [***]

               Greater than [***] annual                        [***]

         LICENSEE REVENUE is to be defined as [***]. All terms stated in
sections 3.2.2, 3.2.3, 3.2.4, 3.2.5 and 3.2.6 shall apply to calculations of
SUB-LICENSEE or AFFILIATE royalty revenue. 

         3.2 - Royalties

         3.2.1 LICENSEE shall pay to HRI a royalty of [***] of NET SALES of
LICENSED PRODUCT under the EXCLUSIVE LICENSE granted under Section 2.1.1. 


<PAGE>   7
                                       7


         3.2.2 As applied to OTHER PRODUCTS on which no royalty is due HRI under
Section 3.2.1, LICENSEE shall pay to HRI a royalty which shall be due as to
OTHER PRODUCTS sold commercially in a country in the FIELD in the TERRITORY on
which no LICENSED PATENT RIGHTS have issued in that country which royalty shall
be [***] of the royalties provided for in Section 3.2.1.

         3.2.3 Royalty shall be payable only once and only under a single
section of Section 3.2 with respect to a single unit of LICENSED PRODUCT or
OTHER PRODUCT regardless of the number of LICENSED PATENT RIGHTS covering such
LICENSED PRODUCT.

         3.2.4 There shall be no obligation to pay HRI under Sections 3.2.1 or
3.2.2 on sales of LICENSED PRODUCTS or OTHER PRODUCTS between LICENSEE and its
AFFILIATES or SUB-LICENSEES, but in such instances, the obligation to pay
Royalties shall arise upon the sale by the AFFILIATE or SUB-LICENSEE to
unrelated third parties. If, however, the AFFILIATE or SUB-LICENSEE is the end
user of such LICENSED PRODUCTS or OTHER PRODUCTS, royalties shall be due upon
LICENSEE's sale to such AFFILIATE or SUB-LICENSEE. Payments due under this
Section shall be deemed to accrue when such products are invoiced.

         3.2.5 In addition to all other sums required to be paid by LICENSEE to
HRI, commencing on the first anniversary of this Agreement, LICENSEE shall pay
to HRI a [***] at the date of this anniversary, provided however, that royalty 
payments made 


<PAGE>   8
                                       8


   
pursuant to Sections 3.1.1, 3.2.1, 3.2.2 and 3.2.4 computed only for purposes of
this Section 3.2.5 on an annual basis shall be a credit against the Minimum
Annual Royalty. The obligation to pay Minimum Royalties as herein described
shall remain in effect with the expiration of the last to expire patent included
in LICENSED PATENT RIGHTS or ten (10) years following the first commercial sale
of either LICENSED PRODUCTS or OTHER PRODUCTS, whichever is later. 
    

         3.2.6 Royalty payments shall be made as provided in Article V hereof.

         3.3 - Sub-Licenses

         3.3.1 LICENSEE shall have the right to grant sub-licenses of its rights
under this AGREEMENT and that such agreement provides for the performance by the
SUB-LICENSEE of all of the obligations of LICENSEE hereunder in regard to the
rights sublicensed thereunder, and in addition, the payment of royalties as
required by Section 3.2.4 and reporting requirements of Article IV hereof.

         3.4 - Due Diligence

   
         3.4.1 It is understood by the parties that the LICENSEE shall make
reasonable commercial efforts to develop and commercialize LICENSED PRODUCTS or
OTHER PRODUCTS. It is also understood by the parties that it may not be
commercially reasonable to market LICENSED PRODUCTS or OTHER PRODUCTS in each
and every country in the Territory. If, by the fourth anniversary of this
agreement, LICENSEE has failed to show due diligence in attempting to develop
and/or commercialize LICENSED PRODUCTS or OTHER PRODUCTS in the United States
and/or Canada, HRI shall have the right to terminate this agreement. At such
time,
    


<PAGE>   9
                                       9


   
responsibility for prosecution of outstanding LICENSED PATENT RIGHT patent
applications shall revert to HRI. Payment of monies to HRI under terms of 3.1.1
in aggregate of $150,000 by the fourth anniversary of this agreement shall serve
as proof of LICENSEE's diligence in attempting to commercialize or develop
LICENSED PRODUCTS or OTHER PRODUCTS in the United States and/or Canada. 
    

         3.4.2 With respect to the development and/or commercialization of
LICENSED PRODUCTS or OTHER PRODUCTS in countries other than [***]. Nevertheless
the parties agree that attempts should be made to commercialize OTHER PRODUCTS
on a worldwide basis. Therefore, if by [***] of this agreement, LICENSEE has not
filed patent applications on at least one product or process developed using
TECHNICAL INFORMATION or using INVENTION in a country other than [***], HRI will
be free to seek a second licensee for territories outside [***]. HRI's election
to seek a second licensee in such territories will have no effect on LICENSEE's
rights.


ARTICLE IV - REPORTS

         4.1 Within ninety (90) days after the close of each year during the
term of this Agreement prior to market introduction of a LICENSED PRODUCT or
OTHER PRODUCT by LICENSEE or its AFFILIATES and/or SUB-LICENSEE's, LICENSEE

<PAGE>   10
                                       10


shall report to HRI, and shall cause its AFFILIATES and SUB-LICENSEES to report
to HRI, the status of LICENSEE's or such AFFILIATE's or SUB-LICENSEE's
proceedings under this AGREEMENT. 

         4.2 Within ninety (90) days after the close of each calendar quarter of
each year during the term of this AGREEMENT (including the last day of such
calendar quarter following the expiration date of this AGREEMENT) after market
introduction of a LICENSED PRODUCT or OTHER PRODUCT by LICENSEE or its
AFFILIATES or SUB-LICENSEES, LICENSEE shall report to HRI, and shall cause its
AFFILIATES and/or SUB-LICENSEES to report to HRI, all royalties actually
accruing under Article III during such calendar quarter. Such quarterly reports
shall indicate for such calendar quarter the aggregate NET SALES price of
LICENSED PRODUCT or OTHER PRODUCT sold by LICENSEE and its AFFILIATES or
SUB-LICENSEES with respect to which a royalty is due and the amount of such
royalty. In case no royalty is due for any such period, LICENSEE shall so
report. LICENSEE shall keep, accurate and complete records of total cumulative
records of all NET SALES and to keep other accurate and complete records in
sufficient detail to enable HRI or its representative to determine the aforesaid
royalties due under Article III which records shall be maintained and available
at all reasonable times for a period of three (3) years following the end of the
period to which they pertain. Upon the request of HRI and at HRI's expense,
LICENSEE and its AFFILIATES or SUB-LICENSEES shall permit an independent
certified public accountant selected by HRI, except one to whom there shall be
some reasonable objection by LICENSEE or its AFFILIATE or SUB-LICENSEE in
question, to have 
<PAGE>   11
                                       11


access, not more than once in each calendar year, during regular business hours
and upon reasonable notice to LICENSEE or its AFFILIATES or SUB-LICENSEES as may
be necessary to verify the accuracy of the reports made during the previous
calendar year, but said accountant shall not disclose to HRI any information
except that which should properly have been contained in such reports.

ARTICLE V - TIMES AND CURRENCIES OF PAYMENT

         5.1 Royalties shown to have accrued by each of the quarterly reports
provided for under Article IV above or one-quarter (1/4) of the Minimum Annual
Royalty required in Section 3.2.5 hereof together with any unpaid sums due under
Section 3.1.1 hereof shall be due and payable on the date such report is due.
Royalty payments shall be made in United States Dollars, and, where appropriate,
shall be calculated in the currency of the sale and then converted into United
States Dollars using the applicable exchange rate set forth in the Wall Street
Journal for the last business day of the applicable reporting quarter. In the
event that the laws and regulations controlling in any foreign country prevent a
payment to be made as provided herein or prevent a payment in United States
dollars, HRI agrees to accept such payment in the form and place as permitted,
including deposits by LICENSEE in the applicable foreign currency in a local
bank or banks designated by HRI in such amount as HRI may direct. Any
withholding taxes levied by governments which LICENSEE is required to withhold
on remittance of such payments shall be deducted from such payment paid to HRI.
LICENSEE shall furnish HRI the original copies of all official receipts for such
taxes.

<PAGE>   12
                                       12


ARTICLE VI - PATENT INFRINGEMENT

         6.1 If a patent or patents of a third party should exist during the
term of any license granted under this AGREEMENT in any country, in conflict
with the LICENSED PATENT RIGHT, and if it should prove in LICENSEE's judgment
impractical or impossible for LICENSEE or its AFFILIATES to continue the use or
sale of LICENSED PRODUCTS by reason of such conflict without obtaining a royalty
bearing license from such third party under such patent or patents, then
LICENSEE shall be entitled to a credit against the royalty payments due
hereunder of an amount equal to the royalty paid to such third party for the
right to use or sell LICENSED PRODUCTS, provided, however that such credit shall
not exceed [***] of the royalty payments due hereunder, and provided further,
that HRI may at its option challenge by judicial action and validity of any such
patent or patents of a third party if LICENSEE declines to do so and in such
event LICENSEE shall not be entitled to any such credit unless it shall be
determined by a court that LICENSED PRODUCTS infringe such patent or patents of
such third party; provided, however, that during the pendency of HRI's challenge
to the validity of any such patent or patents of a third party until the final
determination of such challenge in a decision by a court of competent
jurisdiction and of last resort, or in a decision of an inferior tribunal from
which no appeal has been taken in the applicable period or can be taken, HRI
shall be required to hold in an interest bearing escrow account an amount equal
to the royalty paid by LICENSEE to such third party for the right to use and
sell LICENSED PRODUCTS, HRI shall be entitled to all escrowed funds together
with interest paid thereon, and upon such determination in favor of such 
<PAGE>   13
                                       13


third party, HRI shall deliver all escrowed funds together with interest paid
thereon to LICENSEE.

ARTICLE VII - PATENT RIGHTS

         7.1 Title to all patent and patent applications shall be in the name of
HRI.

         7.2 Subject to the review and approval of HRI, LICENSEE shall bear
responsibility for (a) filing and prosecuting in the United States, any patent
applications relating to the INVENTION, and the filing and prosecution of all
divisions, continuations, continuations-in-part, reissues or reexaminations
thereof; (b) prosecuting and defending any oppositions involving such patent
applications or any Letters Patent granted thereon; and (c) upon and after the
grant of any Letters Patent on any of such applications, and during the term of
this AGREEMENT, maintaining such Letters Patent in force and paying all fees and
filing all necessary papers required for such purposes on or after the date of
this Agreement.

         7.3 In addition to its obligations under Article VII hereof, HRI and
LICENSEE shall have the same obligations, by whatever name known, in regard to
foreign jurisdictions. HRI and LICENSEE shall discuss and agree on the foreign
jurisdictions where patent applications are to be filed.

<PAGE>   14
                                       14


ARTICLE VIII - COMPULSORY LICENSES

         8.1 In the event that HRI or LICENSEE is required by any governmental
authority to grant a compulsory license to any third party in any country, then
the royalty rate set forth in Article III of this AGREEMENT shall be reduced by
[***] or by the amount of the royalty rate contained in such compulsory license,
whichever is the lesser royalty rate reduction, with respect to the sale of the
LICENSED PRODUCT or OTHER PRODUCTS by LICENSEE or its AFFILIATES or
SUB-LICENSEES to unrelated third parties in such country, with effect from the
date of first commercial sale by the third party in such country or the date of
first commercial sale by LICENSEE for which LICENSEE is require to pay such
royalty.

ARTICLE IX - PATENT ENFORCEMENT

         9.1 Each party shall promptly notify the other of any material
infringement of or attack upon any patent within LICENSED PATENT RIGHTS by a
third party or parties, as soon as the notifying party learns of such
infringement, and shall provide the other party with any available evidence of
such infringement or attack.

         9.2 Upon notice of infringement or attack upon any patent within
LICENSED PATENT RIGHTS by a third party or parties, LICENSEE shall, on behalf of
HRI, take reasonable steps to enforce such patent against such infringement or
attack, and shall keep HRI informed of the progress of such proceedings. Any
such action shall be at LICENSEE's expense. In addition, during such action,
LICENSEE shall withhold [***] 

<PAGE>   15
                                       15


of any royalty obligation to HRI, until such time as the action is completed.
Any remaining royalty obligation after deducting expenses incurred shall be paid
within the next calendar quarter following completion of such action. [***] of
any damages recovered by LICENSEE from such action, after deducting expenses,
shall be paid to LICENSEE, with the remaining [***] payable to HRI. HRI shall,
if requested, actively assist in the prosecution of such action.

         9.3 In the event that LICENSEE refuses or fails to institute and
aggressively prosecute legal proceedings against such infringement or otherwise
to defend such patent, then HRI shall have the right, at its sole option, to
enforce such patent at its sole expense. Any damages recovered from such action,
if any, shall belong exclusively to HRI and LICENSEE shall thereafter have no
further rights under this AGREEMENT in such jurisdiction.


ARTICLE X - INDEMNIFICATION

         10.1 LICENSEE shall defend against and indemnify HRI for the cost of
defense and for money judgments awarded, if any, as a result of any claim or
lawsuit being made or brought by any person against HRI for all claims arising
as a result of the clinical testing, manufacture, use or sale of LICENSED PATENT
RIGHTS, OTHER PRODUCTS or the INVENTION by LICENSEE, its AFFILIATES or
SUB-LICENSEES hereunder except for research performed under the direction of HRI
or its affiliates.

         10.2 This indemnity is conditioned upon HRI's obligation to: (i) advise
LICENSEE of any claim or lawsuit, in writing, within a reasonable time after HRI
has 
<PAGE>   16
                                       16


received process or written notice in regard thereto, provided however, that HRI
shall not then be in default in regard to such process but may have appeared,
pleaded or obtained an extension so to do in regard thereto and (ii) assist
LICENSEE and its representatives in the investigation and defense of any lawsuit
and/or claim for which indemnification is provided.

         10.3 As used in Article X, HRI shall be deemed to include Roswell Park
Cancer Institute, Health Research, Inc., New York State Department of Health,
New York State and the State of New York, and the officers, agents or employees
of any of them.


ARTICLE XI - TERM
   
         11.1 This AGREEMENT will remain in effect, unless sooner terminated as
provided below, until the expiration of the last to expire patent included in
LICENSED PATENT RIGHTS or ten (10) years following the first commercial sale of
either LICENSED PRODUCTS or OTHER PRODUCTS, whichever is later.
    

ARTICLE XII - TERMINATION

         12.1 Material breach by HRI or LICENSEE of the obligations or
conditions contained in this AGREEMENT shall entitle the other party to give to
the party in material breach notice requiring the breaching party to correct
such breach. If such breach is not corrected or if substantial progress is not
made toward such correction, within ninety (90) days after the receipt of such
notice, the notifying party shall be 
<PAGE>   17
                                       17


entitled (without prejudice to any of its other rights conferred on it by this
AGREEMENT) to terminate this AGREEMENT by giving notice to take effect
immediately. The right of either party to terminate this AGREEMENT, as
hereinabove provided, shall not be affected in any way by its waiver of, or
failure to take action with respect to, any previous breach.

ARTICLE XIII - RIGHTS AND OBLIGATIONS UPON AND FOLLOWING

               TERMINATION

         13.1 Termination of this AGREEMENT, by expiration or otherwise for any
reason, shall be without prejudice to:

         13.1.1  HRI's rights to receive all royalties due and accrued hereunder
and unpaid on the effective date of such termination;

         13.1.2 The rights and obligations pursuant to Articles III and IV
         hereof, and 

         13.1.3 Any other further remedies which either party may then have
hereunder.

         13.2 Upon termination of this AGREEMENT, LICENSEE shall return or
destroy, as requested by HRI, such TECHNICAL INFORMATION, subject to retention
of one copy of written or printed Technical Information which may be retained in
confidence in LICENSEE's permanent legal files.
<PAGE>   18
                                       18


ARTICLE XIV - FORCE MAJEURE

         14.1 If the performance of any part of this AGREEMENT by either party,
or of any obligation under this AGREEMENT, is prevented, restricted, interfered
with or delayed by reason of any cause beyond the reasonable control of the
party liable to perform, unless conclusive evidence to the contrary is provided,
the party so affected shall, upon giving written notice to the other party, be
excused from such performance to the extent of such prevention, restriction,
interference or delay, provided that the affected party shall use its reasonable
best efforts to avoid or remove such causes of non-performance and shall
continue performance with the utmost dispatch whenever such causes are removed.
When such circumstances arise, the parties shall discuss what, if any,
modification of the terms of this AGREEMENT may be required in order to arrive
at an equitable solution.


ARTICLE XV - PUBLICATION

         15.1 The parties agree that HRI, RPCI and/or Drs. Repasky and Bumpers
may continue research in regard to the INVENTION, and that the parties and their
employees shall be free to publish scientific articles relating to research in
regard to LICENSED PRODUCT and the INVENTION , provided however, that for the
duration of the Collaborative Agreement for Commercial Sponsors or any
extensions thereof, LICENSEE is given notice of HRI's intent to publish any
research resulting from such 
<PAGE>   19
                                       19


Agreement and is provided with a copy of the material for publication at least
thirty (30) days in advance of the publication date. In the event LICENSEE
determines a need to delay publication for reasons related to protection of
intellectual property, HRI shall agree to delay such publication for up to
ninety (90) days per LICENSEE's request.


ARTICLE XVI - ASSIGNMENT

         16.1 This AGREEMENT shall not be assignable by either party without the
prior written consent of the other party, except by LICENSEE to the successor or
assignee of substantially all of its business related to LICENSED PRODUCT or
OTHER PRODUCT. It is expressly understood and agreed, however, that the assignor
of any rights hereunder shall remain bound by its obligations hereunder and the
assignee shall assume all of the assignor's liabilities hereunder. 

ARTICLE XVII - ENTIRE AGREEMENT AND AMENDMENT

         17.1 This AGREEMENT contains the entire understanding of the parties
with respect to the matters contained herein. This AGREEMENT may be amended,
modified or altered only by an instrument in writing duly executed by the
parties hereto.

<PAGE>   20
                                       20


ARTICLE XVIII - NOTICES

         18.1 Any notice or report required or permitted to be given or made
under this AGREEMENT by one of the parties hereto to the other shall be in
writing and shall be deemed effective upon receipt by the other party of such
notice or report by personal delivery, fax, express mail delivery or by
registered airmail, postage prepaid, addressed as follows:


         If to HRI:                 Michael D. DeLellis
                                    Director of Operations
                                    Health Research, Inc.,
                                    Roswell Park Division
                                    Elm and Carlton Streets
                                    Buffalo, NY  14263

                                       and

                                    Elizabeth Repasky
                                    Roswell Park Cancer Institute
                                    Elm and Carlton Streets
                                    Buffalo, NY  14263

         If to LICENSEE:

                                    Corixa Corporation
                                    1124 Columbia Street
                                    Suite 464
                                    Seattle, WA  98104
                                    Attn: President or Chief Operating Officer

ARTICLE XIX - SEVERABILITY


         19.1 In the event that any one or more of the provisions of this
Agreement should for any reason be held by any court or authority having
jurisdiction over this Agreement, or either of the parties hereto, to be
invalid, illegal or unenforceable, such provision or provisions shall be
reformed to approximate as nearly as possible the 
<PAGE>   21
                                       21


intent of the parties, and if unreformable, shall be divisible and deleted in
such jurisdictions; elsewhere, this Agreement shall not be affected.

ARTICLE XX - GOVERNING LAW

         20.1 The laws of the United States of America and the State of New York
shall govern the interpretation and performance of this Agreement.

ARTICLE XXI - NON USE OF NAMES

         21.1 Neither party shall use the name of the other party or any
employee, officer or affiliate of such party in any publication or advertising
without specific prior written permission from the other party.

         21.2 For purposes of Section 21.1, Roswell Park Cancer Institute, New
York State Department of Health, New York State or the State of New York or any
adaptation, abbreviation or derivative thereof shall be additional names to
which such prohibition applies.

<PAGE>   22
                                       22


         IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed in duplicate by their duly authorized representatives as of the day and
year first above written.


CORIXA CORPORATION                          HEALTH RESEARCH, INC.



BY:  /s/ STEVEN GILLIS, PhD                 BY:   /s/ MICHAEL D. DELELLIS
   -------------------------------             ---------------------------------
         STEVEN GILLIS, PHD                           MICHAEL D. DELELLIS
         PRESIDENT AND                               DIRECTOR OF OPERATIONS
           CHIEF OPERATING OFFICER

<PAGE>   1
                                                                   EXHIBIT 10.29

                                LICENSE AGREEMENT


         This License Agreement is made and entered into as of May 22, 1996, 
by and among SOUTHERN RESEARCH INSTITUTE, a non-profit corporation, having
an address at 2000 Ninth Avenue South, Birmingham, Alabama 35205 ("Southern"),
UNIVERSITY OF ALABAMA AT BIRMINGHAM RESEARCH FOUNDATION, a non-profit
corporation having an address at 1120G Administration Building, 701 20th Street
South, Birmingham, Alabama 35294 ("UABRF") and CORIXA CORPORATION, a Delaware
corporation having an address at 1124 Columbia Street, Suite 464, Seattle,
Washington 98104 ("Licensee").

                                    RECITALS

         A. Southern and UABRF each own rights in certain technology related to
microencapsulation and microcapsule formulation.

         B. Southern and UABRF each desire to have such technology utilized in
the public interest.

         C. Licensee desires to obtain and Southern and UABRF each desire to
grant to Licensee a license under such technology upon the terms and conditions
hereinafter set forth.

         NOW, THEREFORE, the parties hereto agree as follows:

                                    AGREEMENT

         1. DEFINITIONS

         For purposes of this License Agreement, the following terms shall have
the following meanings:

         1.1 "AFFILIATE" shall mean an entity that controls, is controlled by,
or is under common control with another corporation or business entity. The
direct or indirect ownership of at least fifty percent (50%) or the maximum
allowed by applicable law, if less, of the voting securities or an interest in
the assets, profits or earnings of a business entity shall be deemed to
constitute control of the business entity.

         1.2 "CANCER FIELD" shall mean [***].

         1.3 "CONFIDENTIAL INFORMATION" shall mean information and materials
(biological, chemical or otherwise) that are either marked as confidential or
not generally 


Southern Research Institute License Agreement

<PAGE>   2
known or available outside Licensee, Southern or UABRF and information and
materials entrusted to Licensee, Southern or UABRF by third parties.
Confidential Information may include, but is not limited to, trade secrets,
confidential knowledge, ideas, biological materials, chemical materials,
information about biological or chemical materials, any information that may
relate to the Licensed Technology, research, development, manufacturing,
business plans, personnel, purchasing, financial data, marketing or selling.
Confidential Information may include or be contained in materials such as
drawings, samples, prototypes, data, procedures, specifications, reports,
studies, customer or supplier lists, budgets, cost or price lists, compilations
or computer programs, or may be in the nature of unwritten knowledge or
know-how.

         1.4 "CORIXA ADJUVANT" shall mean an adjuvant, or any analog or homolog
of such an adjuvant, owned or controlled during the term of this License
Agreement by Licensee.

         1.5 "CORIXA ANTIGEN" shall mean an antigen, or any analog or homolog of
such an antigen, owned or controlled during the term of this License Agreement
by Licensee.

         1.6 "CORIXA COMPONENT" shall mean (a) a Corixa Antigen, (b) a Corixa
Antigen together with (i) either a Corixa Cytokine or a Corixa Adjuvant or (ii)
a Corixa Cytokine and a Corixa Adjuvant, (c) a Corixa Adjuvant or (d) a Corixa
Adjuvant together with a Corixa Cytokine.

         1.7 "CORIXA CYTOKINE" shall mean a cytokine, or any analog or homolog
of such a cytokine, owned or controlled during the term of this License
Agreement by Licensee.

         1.8 "HIV" shall mean human immunodeficiency virus.

         1.9 "INFECTIOUS DISEASE FIELD" shall mean elicitation of an immune
response in humans against [***].

         1.10 "LIABILITIES" shall have the meaning assigned thereto in Section
13.

         1.11 "LICENSED PRODUCT" shall mean, subject to Sections 2 and 4 hereof,
any [***] deliverable product comprised at least in part of Licensed Technology
or Southern Patent Rights and that, in the case of Licensed Products sold in the
Cancer Field, is also comprised of at least one Corixa Component.

         1.12 "LICENSED TECHNOLOGY" shall mean the Patent Rights and all
know-how related to the Patent Rights.


Southern Research Institute License Agreement

                                      -2-

<PAGE>   3
         1.13 "NET SALES" shall mean the gross amount received by Licensee or
its Affiliates or Sublicensees hereunder for the sale or other disposition to an
unaffiliated third party, including but not limited to any distributor or
end-user, of a product, less the following deductions for amounts actually
incurred related to the sale or other disposition:

              (a) normal, customary trade discounts (including volume
discounts), credits and rebates and allowances and adjustments for rejections,
recalls or returns;

              (b) freight, insurance, sales, use, excise, value-added and
similar taxes or duties imposed on the sale and included in the gross amount
charged and government-mandated vaccine insurance premiums;

              (c) amounts, at standard cost, for devices sold in combination
with the Licensed Product, including, but not limited to, prefilled syringes and
ex vivo cell separation and selection devices.

         1.14 "PATENT RIGHTS" shall mean all rights in and to the
Composition/Method Inventions and the Southern Process Inventions (as such terms
are defined in Sections 6(b) and 6(c), respectively, of the Research Agreement),
and any and all patents and patent applications thereon, and the technology
covered by the patents and patent applications listed on Schedule 1.14 hereto,
and such patents and patent applications, including any and all renewals,
divisions, continuations, continuations-in-part and patents issuing thereon and
any reissues, extensions, substitutions, confirmations, registrations,
revalidations, revisions and additions of or to such patents, and all foreign
counterparts of any of the foregoing.

         1.15 "PHASE I" shall mean clinical trials as described at 21 C.F.R. pt.
312.21(a), a copy of which is set forth on Exhibit A hereto, that are in
compliance with the regulations of the FDA or the equivalent foreign regulatory
agency.

         1.16 "PHASE III" shall mean clinical trials as described at 21 C.F.R.
pt. 312.21(c), a copy of which is set forth on Exhibit A hereto, that are in
compliance with the regulations of the FDA or the equivalent foreign regulatory
agency.

         1.17 "PLA" shall mean a Product License Application for approval of a
biological product, as defined in 21 C.F.R. pt. 312.3, a copy of which is set
forth on Exhibit A hereto.

         1.18 "RESEARCH AGREEMENT" shall mean the Research Agreement (With
Option to License), dated as of January 4, 1995, by and between Southern and
Licensee.

         1.19 "SOUTHERN PATENT RIGHTS" shall mean all rights in and to the
technology covered by U.S. Patent No. 4,897,268 and all foreign counterparts of
the foregoing and all know how related to the foregoing.


Southern Research Institute License Agreement

                                      -3-
<PAGE>   4
         1.20 "SUBLICENSEE" shall mean any unaffiliated third party granted
rights hereunder by Licensee, including, but not limited to, a marketing or
collaborative partner of Licensee.

         1.21 "THIRD PARTY CLAIM" shall have the meaning assigned thereto in
Section 11, Infringement.

         1.22 "VALID CLAIM" shall mean a claim of an issued, unexpired patent
included in the Patent Rights or Southern Patent Rights that has not been (a)
held invalid or unenforceable by a final decision of a court or governmental
agency of competent jurisdiction, which decision is unappealable or was not
appealed within the time allowed therefor, or (b) admitted in writing to be
invalid or unenforceable by the holder(s) by reissue, disclaimer or otherwise.

         1.21 "WARRANT" shall have the meaning provided in Section 3.6 hereof.

         2. LICENSES

         2.1 Southern hereby grants under the Southern Patent Rights and
Southern and UABRF hereby grant under the Licensed Technology to Licensee an
exclusive, worldwide license, including the right to sublicense, in the
Infectious Disease Field to make, have made, research, use, sell and have sold
Licensed Products.

         2.2 Southern hereby grants under the Southern Patent Rights and
Southern and UABRF hereby grant to Licensee under the Licensed Technology an
exclusive, worldwide license, including the right to sublicense, in the Cancer
Field to make, have made, research, use, sell and have sold Licensed Products
that incorporate at least one Corixa Component.

         2.3 The licenses granted hereby are subject to (a) the rights of the
United States government, if any, as set forth in 35 U.S.C. Section 200, et seq.
and (b) Southern's and UABRF's right to practice the Licensed Technology and the
Southern Patent Rights in any way they choose outside of the licenses granted to
Licensee hereunder and in any event to retain noncommercial and research rights
within the fields of use licensed to Licensee hereunder.

         3. ROYALTIES AND LICENSE CONSIDERATION

         3.1. Licensee shall pay Southern the following royalty on cumulative,
worldwide Net Sales of Licensed Product the sale of which, but for the licenses
granted hereunder, would infringe at least one Valid Claim in the country of
sale:

              (a) [***] of Net Sales of Licensed Products sold for use in 
vivo; and


Southern Research Institute License Agreement

                                      -4-

<PAGE>   5
              (b) [***] of Net Sales of Licensed Products sold for use ex vivo.

         3.2 (a) In the event the aggregate of all royalties owing by Licensee
to third parties on Net Sales of any Licensed Product sold for use in vivo is
less than [***], Southern's royalty on Net Sales of such Licensed Product shall
be increased by an amount equal to [***] the amount by which such aggregate
royalty falls short of [***]. In the event the aggregate of all royalties owing
by Licensee to third parties on Net Sales of any Licensed Product sold for use
ex vivo is less than [***], Southern's royalty on Net Sales of such Licensed
Product shall be increased by an amount equal to [***] the amount by which such
aggregate royalty falls short of [***]. In the event the aggregate of all
royalties owing to Licensee by third parties on Net Sales of any Licensed
Product is greater than [***], Southern's royalty on Net Sales of such Licensed
Product shall be increased by an amount equal to [***] the amount by which such
aggregate royalty exceeds [***].

              (b) When Licensee's obligation to pay royalties on Net Sales in
the country of sale of a Licensed Product pursuant to Section 3.1 hereof lapses
due to the expiration in such country of all Valid Claims that were the basis of
the royalty obligations related to such Licensed Product, but such Licensed
Product incorporates or utilizes Southern or UABRF know-how, then Southern's
royalty on Licensee's further Net Sales of such Licensed Product in such country
shall be reduced by [***]. In the event Licensee is not obligated to pay
royalties on Net Sales in the country of a Licensed Product pursuant to Section
3.1 because no Valid Claim covering the sale of such Licensed Product in the
country of sale has issued, whether because no patent application including such
claim(s) has been filed or otherwise, but such Licensed Product incorporates or
utilizes Southern or UABRF know-how, then Southern's royalty on such Licensed
Products sold for in vivo use shall be [***] and on such Licensed Products sold
for ex vivo use shall be [***].

              (c) For a product, royalties payable pursuant to Section 3.2(b)
shall be reduced by [***], in that country in the event, in the county of sale
of the Licensed Product the sale of which gives rise to the obligation to pay
royalties thereunder, a third party shall, at any time during the calendar
quarter of such Licensed Product sales, commercialize one or more products
comprised at least of polymer beads of less than [***] in diameter, which beads
are used for vaccine delivery for the disease indication of such Licensed
Product. The reduction pursuant to this Section 3.2(c) shall not apply for
any subsequent calendar quarter during which such third-party product is not
being commercialized. 


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                                      -5-

<PAGE>   6
              (d) Licensee's obligation to pay royalties pursuant to Sections
3.2(b) and 3.2(c) shall terminate on a product-by-product and country-by-country
basis.
   
                  (i) For Licensed Products in connection with which royalties
were payable pursuant to Section 3.2(a) prior to becoming payable pursuant to
Section 3.2(b) or 3.2(c), such obligation shall terminate ten (10) years
following expiration of the last to expire of the Valid Claims that covered the
applicable Licensed Product during the period that royalties were payable on the
sale thereof pursuant to Section 3.2(a).
    
   
                  (ii) For Licensed Products in connection with which royalties
have been payable solely pursuant to Section 3.2(b) or 3.2(c), such obligation
shall terminate twenty-five (25) years following the date first above written.
    

              (e) In accordance with the terms of Section 3.2(d), sections 3.2
(b) and 3.2(c) shall survive the expiration or termination of this Agreement.

         3.3 All royalty payments hereunder shall be in U.S. dollars, due and
payable within forty-five (45) days after the end of each calendar quarter with
respect to Net Sales of Licensed Product during such quarter. Licensee shall
deliver to Southern with each royalty payment a report setting forth the sales
during such quarter and a calculation of the royalties due thereon. Where sales
are not made in U.S. dollars, the sales amounts will be translated using the
rate of exchange quoted in The Wall Street Journal on the last business day of
such quarter.

         3.4 Licensee shall pay Southern annually a minimum royalty of [***]
commencing the year following the year during which Licensee receives PLA or
equivalent regulatory approval for commercial sale of a Licensed Product in 
[***]. Amounts owing annually pursuant to Section 3.1 or 3.2 shall be applied
against such minimum royalty payment. Any amount creditable against royalties
pursuant to Section 3.6 shall be applied against such minimum royalties.

         3.5 Licensee shall deliver to Southern a one-time license fee comprised
of (a) a cash payment of [***], payable within fifteen (15) days following
execution of this License Agreement and (b) subject to the terms and execution
by Southern of Licensee's investor's representation agreement in the form
attached hereto as Exhibit 3.5, Fifty Thousand (50,000) shares of Corixa
Corporation common stock.


Southern Research Institute License Agreement

                                      -6-

<PAGE>   7

3.6

         (a) The following amounts shall be payable by Licensee to Southern upon
achievement by Licensee or any of its Sublicensees of the following milestones:

             (i) $[***] upon initiation of the first Phase I clinical trial, or
its equivalent admissible in at least one (1) of the countries set forth in
Section 3.4, for a Licensed Product;

             (ii) $[***] upon initiation of the first Phase III clinical
trial, or its equivalent admissible in at least one (1) of the countries set
forth in Section 3.4, for a Licensed Product; and

             (iii) $[***] upon submission of the first PLA or equivalent
regulatory application in one (1) of the countries set forth in Section 3.4, for
a Licensed Product.

[***]

         (b) Corixa shall grant to Southern a warrant in the form attached
hereto as Exhibit 3.6 (the "Warrant"), for the purchase of two hundred fifty
thousand (250,000) shares of Corixa common stock, exercisable as follows:

   
             (i) For 25,000 shares of Licensee's Common Stock at any time and
each time following the execution of an agreement, other than, for example, an
evaluation, materials transfer, option or other similar agreement, between
Licensee and any Sublicensee pursuant to which Licensee has granted rights
hereunder; provided, however, that this subsection 3.6(b)(i) is limited to the
first five (5) such sublicenses executed after the date first above written; and

             (ii) For 25,000 shares of Licensee's Common Stock at any time and
each time following the initiation by Corixa or any of its Sublicensees of Phase
III clinical trials or their equivalent admissible in at least one (1) of the
countries set forth in Section 3.4, for a Licensed Product; provided, however,
that this subsection 3.6(b)(ii) is limited to the first five (5) such Phase III
trials initiated after the date first above written;

and provided, further, that, in accordance with the terms and conditions of the
Warrant (x) the above share numbers are subject to adjustment and (y) the
entire 250,000 shares shall be exercisable in the event of an Acquisition (as
defined in the Warrant).
    

Southern Research Institute License Agreement

                                      -7-

<PAGE>   8

         3.7 Licensee shall have no obligation and Southern shall be solely
responsible for accounting to and making any payments that would otherwise
accrue and be payable hereunder to UABRF.

         3.8 Royalty payments that are overdue shall bear interest at the rate
of [***].

         4.       OPTION FIELDS

         4.1 Southern hereby grants under the Southern Patent Rights and
Southern and UABRF hereby grant to Licensee under the Licensed Technology in the
fields of [***] an exclusive option to an exclusive, worldwide license, 
including the right to sublicense, to make, have made, research, use, sell 
and have sold Licensed Products.

         4.2 Southern hereby grants under the Southern Patent Rights and
Southern and UABRF hereby grant to Licensee under the Licensed Technology in the
field of [***] an exclusive option to an exclusive, worldwide license, including
the right to sublicense, to make, have made, research, use, sell and have sold
Licensed Products that incorporate at least one antigen owned or exclusively
licensed to Licensee.

         4.3 The options set forth in Section 4.1 and 4.2 shall be exercisable
on a field-by-field basis upon Licensee's written notice to Southern and UABRF
at any time and from time to time of Licensee's election to exercise such option
in one or more of such fields. Upon such an exercise, the rights and obligations
of Southern, UABRF and Licensee with respect to the exercised field(s) shall be
on the terms and conditions of this Agreement, provided, however, that Licensee
shall have no obligation in connection with any such exercise pursuant to
Section 3.5 hereof.

         4.4 Southern hereby grants under the Southern Patent Rights and
Southern and UABRF hereby grant to Licensee under the Licensed Technology in the
fields of [***] an exclusive option to negotiate an exclusive, worldwide
license, including the right to sublicense, to make, have made, research, use,
sell and have sold Licensed Products.

         4.5 The option to negotiate set forth in Section 4.4 shall be
exercisable on a field-by-field basis upon Licensee's written notice to Southern
and UABRF at any time and from time to time of Licensee's election to exercise
such option in one or more such fields. Upon such an exercise, the parties shall
negotiate in good faith the remainder of the terms of such license. In the event
that [***] following the date of such an exercise the parties have not executed
a license agreement for any or all of the applicable exercised fields, Southern
and UABRF shall have the right to negotiate with third parties 


Southern Research Institute License Agreement

                                      -8-

<PAGE>   9
in any field so exercised but not so licensed. In the event that prior to such
an exercise in connection with one or more fields, Southern or UABRF shall have
received a bona fide third party offer to negotiate a license in such a field,
Southern or UABRF, as applicable, shall give Licensee written notice of such
third party offer, specifying the field(s) of interest to such third party. In
the event Licensee desires to exercise its option in any or all such field(s),
Licensee shall so notify Southern and UABRF within [***] following Licensee's
receipt of notice. Upon receipt by Southern and UABRF of such notice, the
parties shall within [***] thereafter negotiate in good faith a license
agreement in the applicable field(s). In the event that after such [***] period
the parties have not executed a license agreement for any or all of the
applicable exercised fields, Southern and UABRF shall have the right to
negotiate with third parties in any field so exercised but not so licensed.

   
         4.6 For so long as Licensee continues to have the option to negotiate
set forth in section 4.4, annually, commencing one (1) year following the date
first above written, Licensee shall (a) pay to Southern an option fee of [***]
and (b) grant to Southern fifteen thousand (15,000) shares of Licensee's Common
Stock, subject to the terms of Licensee's standard form of investment
representation letter.
    
         4.7 At each quarterly meeting held pursuant to Section 6.1(b) hereof,
the parties shall discuss in good faith (a) whether the fields set forth in
Section 4.1, 4.2 and 4.4 continue to be appropriate and whether any fields
should be added to or deleted from such Sections, including whether any fields
then subject to one such Section should be moved to another such Section; and
(b) amending the amounts payable and number of shares subject to grant pursuant
to Section 4.6 hereof.

         5. REPORTS; BOOKS AND RECORDS

         5.1 Licensee shall keep accurate books and records containing all
information that may be necessary for the purpose of showing the amounts payable
to Southern thereunder. Said books of account shall be kept at Licensee's
principal place of business, such books and records being retained at a
principal place of business for at least three (3) years following the end of
the calendar year to which they pertain.

         5.2 Upon written request of Southern, Licensee shall permit an
independent certified public accounting firm reasonably acceptable to Licensee
to have access during normal business hours to such books and records as may be
reasonable necessary solely to verify the calculation of Net Sales and royalties
thereunder for the three (3) year period preceding such written request. The
fees charged by such accounting firm shall be paid by Southern; provided,
however, that if an audit discloses an underpayment by Licensee of more than
[***] for such audited period, Licensee shall pay the reasonable fees and 
expenses charged by the accounting firm.


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                                      -9-

<PAGE>   10
         5.3 Southern shall treat all financial information subject to review
under this Section 5 as confidential and shall cause its accounting firm to
retain all such information in confidence.

         6. DILIGENCE

         6.1 (a) Licensee shall use commercially reasonable efforts to develop
and commercialize the Licensed Technology and the Southern Patent Rights;
provided, however, that such efforts shall only be required to the extent that
the applicable Licensed Technology or Southern Patent Rights warrant such
efforts in light of then prevailing market conditions, including the existence
of new or more competitive technologies.

             (b) Licensee shall submit to Southern prior to April 1 of each year
during the term annual written progress reports describing Licensee's progress
during the prior calendar year related to Licensee's business and scientific
development of the Licensed Technology and Southern Patent Rights. Southern and
Licensee shall hold quarterly meetings at which the parties will discuss the
progress under the Research Agreement and Licensee shall present any applicable
information related to its business and scientific development of the Licensed
Technology and Southern Patent Rights, including, but not limited to, such
development related to modes of administration of the Licensed Technology and
alternate vaccine technologies such as the Southern Patent Rights. The parties
shall also discuss in good faith at such quarterly meetings additional fields
appropriate to the Research Agreement or for license or option hereunder.

             (c) Licensee shall use commercially reasonable efforts to sell any
Licensed Product sold hereunder as far down the distribution chain as possible.

         6.2 Licensee shall use commercially diligent efforts to file an IND for
a Licensed Product for use as an in vivo vaccine by [***].

         7. MANUFACTURE

         7.1 Southern BioSystems, Inc. or any Southern Affiliate as Southern, in
its sole discretion, shall identify, shall have the first right to negotiate the
manufacture and supply of Licensee's and/or its Sublicensees' initial clinical
trial requirements and commercial requirements of Licensed Product, unless any
Sublicensee thereof elects to control manufacture and supply, in which case
Southern shall provide to such Sublicensee all know-how and other information
necessary to such manufacture and supply, the reasonable costs related to which
shall be borne by Licensee or its Sublicensee(s) hereunder.

         7.2 In the event Licensed Product is manufactured by a Sublicensee (a)
such Sublicensee shall in no event use the Licensed Technology or Southern
Patent Rights other than for the manufacture or sale of Licensed Product, (b)
Southern shall have 


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                                      -10-
<PAGE>   11
commercially reasonable audit and inspection rights of such Sublicensee's
manufacturing facility and (c) Licensee shall cause such Sublicensee to grant
Southern a nonexclusive, royalty-free license to any improvements to the
Licensed Technology and Southern Patent Rights arising from such manufacture.

         8. CONFIDENTIALITY; PUBLICATION

         8.1 In fulfilling their obligations under this License Agreement, it
may be desirable or necessary for the parties to disclose to one another certain
of their Confidential Information. In the event of receipt of such Confidential
Information, the receiving party agrees to preserve such information as
confidential and not to disclose it to third parties or to use it except in
connection with this License Agreement for a period of seven and one-half (7.5)
years after receipt. The foregoing obligations shall not apply to any
information that:

         (a) is now in the public domain or becomes generally available to the
public through no fault of the receiving party;

         (b) is already known to, or in the possession of, the receiving party
as can be demonstrated by documentary evidence;

         (c) is disclosed to the receiving party on a nonconfidential basis by a
third party having the right to make such disclosure; or

         (d) is independently developed by the receiving party as can be
demonstrated by documentary evidence.

         In addition, to the extent reasonably necessary to fulfill its
obligations or exercise its rights under this License Agreement (i) a party may
disclose Confidential Information to its Affiliates, Sublicensees, consultants,
outside contractors and clinical investigators, on a need-to-know basis on
condition that such persons or entities agree to be bound by the provisions of
this Section 8.1, (ii) a party or its Affiliates or Sublicensees may disclose
Confidential Information to governmental or other regulatory authorities to the
extent that such disclosure is reasonably necessary to obtain patents or
regulatory authorizations, provided the disclosing party shall request
confidential treatment thereof, and (iii) a party may disclose Confidential
Information as required by applicable law, regulation or judicial process,
provided that such party shall give the other party (x) prior written notice
thereof, (y) adequate opportunity to object to any such disclosure or to request
confidential treatment thereof, and (z) shall take all steps reasonably possible
to minimize the disclosure to that level mandated by law.

         8.2 The parties may make a joint announcement of the existence of this
License Agreement. Licensee and its Sublicensees may announce clinical,
regulatory and commercial developments related to Licensed Products. Other than
as described above, 


Southern Research Institute License Agreement

                                      -11-

<PAGE>   12
neither party shall publish any news release or other public announcement,
written or oral, announcing this License Agreement or any performance
thereunder, except to the extent required by law in the reasonable opinion of
legal counsel for the originating party (written notice of such opinion being
given to the other party prior to publication and such publication delayed for a
reasonable time to allow the nonpublishing party to respond) or to the extent
mutually agreed by the parties.

         8.3 Southern and Licensee hereby reaffirm their obligations pursuant to
Section 11 of the Research Agreement.

         9. PATENT PROSECUTION

         Southern shall direct the filing, prosecution and maintenance of all
patents and patent applications covering the Patent Rights and the Southern
Patent Rights and shall retain patent counsel reasonably acceptable to Licensee
therefor. The reasonable expenses of such filing, prosecution and maintenance
shall, except to the extent such expenses are borne by one or more third
parties, be borne by Licensee. Licensee shall cooperate and assist Southern in
connection with such filing, prosecution and maintenance. Southern shall cause
to be provided to Licensee the text of any patent applications before filing and
consider in good faith and incorporate Licensee's reasonable requests related
thereto. Southern shall provide copies to Licensee of all other official actions
or submissions and shall confer with Licensee in regard thereto, giving due
consideration to Licensee's reasonable requests.

         10. PATENT ENFORCEMENT

         In the event either party becomes aware of a suspected infringement of
any Patent Right or Southern Patent Right or the institution by a third party of
any proceedings for the revocation of any Patent Right or Southern Patent Right
in any country, such party shall notify the other party promptly. Licensee shall
prosecute any infringement action that materially adversely affects Licensee's
business as then conducted or defend any such proceedings for revocation at its
own expense, in its own name. In such event, Licensee shall be entitled to all
recoveries in any such action or proceeding; provided, however, that Licensee
shall pay to Southern royalties in accordance with Section 3 hereof on the net
amount of such recoveries remaining after deduction of Licensee's costs and
expenses related to such action or proceeding. Southern will assist Licensee, at
Licensee's expense, in such actions or proceedings if so requested, and will
lend its name to such actions or proceedings if requested by Licensee or
required by law. Southern shall have the right to participate and be represented
in any such suit by its own counsel at its own expense. In the event the Patent
Rights or Southern Patent Rights subject of such action or proceeding have been
sublicensed hereunder, the Sublicensee shall also have the right to participate
in such prosecution or defense.


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                                      -12-

<PAGE>   13
         11. INFRINGEMENT

         In the event that a third party at any time threatens to or brings suit
against either party, its Affiliates, or Sublicensees alleging infringement of
any third party patent or trade secret on account of the development,
manufacture, use or sale of any Licensed Product (a "Third Party Claim"), the
party receiving notification of the Third Party Claim shall notify the other
party, enclosing a copy of all pleadings served, if any. Licensee shall control
the defense of such Third Party Claim in its own name and such defense shall be
at its own expense and under its direction and control. Southern and UABRF, at
Licensee's expense, will reasonably assist Licensee in such defense if so
requested. In addition, Southern, UABRF and any applicable Sublicensee
hereunder, shall have the right to participate and be represented in any such
Third Party Claim by its own counsel at its own expense. Any judgments,
settlements or damages payable with respect to a Third Party Claim shall be paid
by Licensee or shared pro rata in the event more than one party so defends,
subject to any claims against the other parties for breach of or for
indemnification under this License Agreement or that are otherwise available at
law or in equity.

         12. REPRESENTATIONS AND WARRANTIES

         12.1 Southern and UABRF represent and warrant to Licensee that Southern
and/or UABRF owns all of the Licensed Technology and Southern Patent Rights and
has all rights and authority necessary to grant the rights and licenses granted
to Licensee thereunder.

         12.2 Neither Southern nor UABRF has granted to any third party any
commercialization rights under the Licensed Technology or Southern Patent Rights
(a) involving Corixa Components in the Cancer Field or (b) in the Infectious
Disease Field.

         12.3 Schedule 1.14 contains a list of all patent applications filed on
or before the date first above written that cover the Licensed Technology. All
inventors named in such applications have assigned, or are under an obligation
to assign, to Southern or UABRF, as applicable, all of their right, title and
interest in and to the inventions claimed in such applications. All inventors
named in the Southern Patent Rights have assigned to Southern all of their
right, title and interest in and to the inventions claimed in such patents.

         12.4 NEITHER PARTY WILL BE LIABLE UNDER ANY CONTRACT, NEGLIGENCE,
STRICT LIABILITY OR OTHER THEORY FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES
WITH RESPECT TO ANY SUBJECT MATTER OF THIS LICENSE AGREEMENT.


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                                      -13-

<PAGE>   14
         13. INDEMNIFICATION

         (a) Licensee hereby agrees to indemnify, hold harmless, and defend
Southern and UABRF and its officers, directors, representatives, agents and
employees from and against any and all demands, claims, suits or actions of any
character presented or brought on account of any injuries, losses or damages
sustained by any person or property in consequence of any act or omission of
Licensee or its agents, employees or subcontractors, except for any injuries,
losses or damages that specifically result from the negligence or willful
misconduct of Southern or UABRF. The foregoing indemnity shall include but not
be limited to court costs, attorneys' fees, costs of investigation and costs of
defense associated with such demands, claims, suits or actions.

         (b) Licensee shall maintain, during the term of this License Agreement,
comprehensive general liability insurance, including products liability
insurance, with reputable and financially secure insurance carriers to cover the
activities of Licensee, its Affiliates and Sublicensees hereunder. Such
insurance shall be written to cover claims incurred, discovered, manifested, or
made during or after the expiration of this License Agreement. Such insurance
shall include Southern and UABRF as additional insureds. Licensee shall furnish
to Southern a certificate of insurance evidencing such coverage.

         14. DISPUTE RESOLUTION

         14.1 The parties shall attempt to resolve through good faith
discussions any dispute which arises under this License Agreement. Any dispute
may, at the election of either party, be referred to the chief executive
officers, or the equivalent, of each party. If they are unable to resolve the
dispute, except one having to do with the scope, enforceability, infringement or
validity of a patent, within thirty (30) days after delivery of written notice
of the dispute from one party to the other, either party may seek to resolve it
by initiating Alternative Dispute Resolution ("ADR") at the geographical
location of the noninitiating party in which the Judicial Arbitration and
Mediation Services ("JAMS") of such location, through a panel of three (3)
arbitrators (the "Arbitrators"), shall control the proceedings as provided
herein. If JAMS is not in existence at the time of such dispute, the American
Arbitration Association, of such location shall be substituted.

         14.2 An ADR shall be initiated by a party by sending written notice
thereof to the other party and JAMS, which notice shall state the issues to be
resolved. Within ten (10) business days after receipt of such notice, the other
party may, by sending written notice to the initiating party and JAMS, add
issues to be resolved. Within twenty (20) business days after the date of the
original ADR notice, JAMS shall nominate to the parties at least ten (10)
qualified nominees from JAMS' panel. Each party shall have five (5) business
days after the receipt of such nominations to select one Arbitrator. The two (2)
Arbitrators so selected shall mutually agree on a third Arbitrator to complete
the panel.


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                                      -14-
<PAGE>   15
         14.3 Each Arbitrator shall have experience in the Field relevant to the
dispute and in intellectual property law matters. In the event of a dispute
between the parties relating to the calculation of any royalties or the amount
of other consideration payable under this License Agreement (including without
limitation, the results of any audit conducted on behalf of a party pursuant to
Section 5.2), then, in addition to the procedure set forth in Section 14.2, the
Arbitrators shall be partners or full members of an internationally recognized
certified public accounting firm which is not an auditing firm for either party
and has not provided material services to either party during the last two (2)
year period prior to the date of ADR initiation.

         14.4 The Arbitrators shall hold a hearing to resolve the issues within
one hundred twenty (120) business days after selection. The location of the
hearing shall be at the geographical location of the noninitiating party. Each
party may be represented by counsel. Prior to the hearing, the parties shall be
entitled to engage in discovery under procedures of the Federal Rules of Civil
Procedure; provided, however, that a party may not submit more than fifty (50)
written interrogatories or take more than six (6) depositions. There shall not
be, and the Arbitrators shall not permit, any discovery within thirty (30) days
of the hearing. The Arbitrators shall have sole discretion regarding the
admissibility of evidence and conduct of the hearing. At least five (5) business
days prior to the hearing, each party shall submit to the other party and the
Arbitrators a copy of all exhibits on which such party intends to rely at the
hearing, a pre-hearing brief (up to 30 pages) and a proposed disposition of the
dispute (up to 5 pages). The proposed disposition shall be limited to proposed
rulings and remedies on each issue, and shall contain no argument on or analysis
of the facts or issues; provided, however, that the parties will not present
proposed monetary remedies. Within five (5) business days after close of the
hearing, each party may submit a post-hearing brief (up to 5 pages) to the
Arbitrators.

         14.5 The Arbitrators shall render a disposition on the proposed rulings
as expeditiously as possible after the hearing, but not later than fifteen (15)
business days after the conclusion of the hearing. In the circumstances where
the Arbitrators rule for a party on a claim in the form of a claim for monetary
damages, the parties will then submit a proposed remedy within ten (10) days of
notice of the ruling. The proposed remedy may be accompanied by a brief in
support of the remedy not to exceed five (5) pages. The Arbitrators will rule on
the proposed remedies within ten (10) days of their submission. The Arbitrators'
disposition shall be final and not appealable, except that either party shall
have the right to appeal such disposition on the basis it was affected by fraud
or bad faith in connection with the ADR proceedings. A judgment on the
Arbitrators' disposition may be entered in any court having jurisdiction over
the parties. The reasonable fees and expenses of the Arbitrators, as well as the
standard charges of JAMS for its assistance, shall be borne equally by the
parties or as they may otherwise agree.


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                                      -15-

<PAGE>   16
         14.6 Except as otherwise provided in this Section 14, JAMS Rules shall
be used in connection with the ADR.

         14.7 A party shall not be prohibited from bringing a claim for
resolution under this Section 14 on the ground that the claim could have been
brought during an earlier proceeding under this Section 14.

         15. TERM AND TERMINATION

         15.1 Unless sooner terminated pursuant to Section 15.2 or 15.3, the
term of this License Agreement shall commence on the date first above written
and continue until the expiration of the last to expire of all patents issuing
on any Patent Rights or Southern Patent Rights licensed under this License
Agreement, including any extensions thereof and any periods of exclusivity
granted by regulatory agencies or other governmental bodies.

         15.2 Southern shall have the right to terminate this License Agreement
if:

             (a) Licensee shall default in the performance of any of the
material obligations herein contained and such default has not been cured within
thirty (30) days after receiving written notice thereof from Southern; or

             (b) Licensee shall cease to carry out its business, become bankrupt
or insolvent, apply for or consent to the appointment of a trustee, receiver or
liquidator of its assets or seek relief under any law for the aid of debtors.

         15.3 Licensee may terminate this License Agreement upon six (6) months'
prior written notice to Southern and upon payment of all amounts due Southern
through the effective date of the termination.

         15.4 Upon termination of this License Agreement, neither party shall be
released from any obligation that matured prior to the effective date of such
termination. Licensee and any Sublicensee may, however, after the effective date
of such termination, sell all products in inventory under the Licensed
Technology or Southern Patent Rights, provided that Licensee shall pay to
Southern the royalties thereon as required by Section 3 hereof and submit the
reports required by Section 3.3 hereof.

         15.5 Sections 5, 8, 12, 13, 14 and 17 shall survive the expiration or
earlier termination of this License Agreement. Sections 3.2(b) and 3.2(c) shall
survive the expiratation or earlier termination of this Agreement in accordance
with Section 3.2(e).

         16. NOTICES

         Any notice or communication pursuant to this License Agreement shall be
sufficiently made or given if sent by certified, first-class mall, postage
prepaid, or 


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                                      -16-

<PAGE>   17
facsimile, addressed to the address below or as either party shall designate by
written notice to the other party

         In the case of Southern:

                  Southern Research Institute
                  2000 Ninth Avenue South
                  Birmingham, AL  35205
                  Attention:  President & Chief Executive Officer
                  Facsimile:  (205) 581-2880
                  eMail:  [email protected]

         In the case of the UABRF

                  UAB Research Foundation
                  1120G Administration Building
                  701 20th Street South
                  Birmingham, AL  35294
                  Attention:  Executive Director
                  Facsimile:  (205) 934-1221

         In the case of Licensee:

                  Corixa Corporation
                  1124 Columbia St.
                  Suite 464
                  Seattle, WA  98104
                  Attention:  Chief Operating Officer
                  Facsimile: (206) 667-5715
                  eMail:  [email protected]

         17.      MISCELLANEOUS

         17.1 This License Agreement shall be construed and interpreted in
accordance with the laws of the state of Washington, regardless of its or any
other jurisdiction's choice of law provisions.

         17.2 The parties acknowledge that this License Agreement and the
Research Agreement set forth the entire understanding and agreement of the
parties hereto regarding the subject matter hereof and supersede all previous
understandings between the parties, written or oral, regarding such subject
matter.


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                                      -17-

<PAGE>   18
         17.3 Nothing contained in this License Agreement shall be construed as
conferring any right to use in advertising, publicity or other promotional
activities any name, trademark or other designation (including any contraction,
abbreviation or simulation of any of the foregoing). Without the express written
approval of the other party, neither party shall use any designation of the
other party in any promotional activity associated with this License Agreement
or the Licensed Technology. Neither party shall issue any press release or make
any public statement in regard to this License Agreement without the prior
written approval of the other party. Notwithstanding the terms and conditions of
this Section 17.3, the parties shall have the right to make disclosures on the
terms and subject to the conditions of Section 8.2 hereof.

         17.4 If one or more of the provisions of this License Agreement shall
be held invalid, illegal or unenforceable, the remaining provisions shall not in
any way be affected or impaired thereby. In the event any provision is held
illegal or unenforceable, the parties shall use reasonable efforts to substitute
a valid, legal and enforceable provision which, insofar as is practical,
implements purposes of the provision held invalid, illegal and unenforceable.

         17.5 Failure at any time to require performance of any of the
provisions herein shall not waive or diminish a party's right thereafter to
demand compliance therewith or with any other provision. Waiver of any default
shall not waive any other default. A party shall not be deemed to have waived
any rights thereunder unless such waiver is in writing and signed by a duly
authorized officer of the party making such waiver.

         IN WITNESS WHEREOF, the parties hereto have caused this License
Agreement to be executed as of the date first above written.

                                          SOUTHERN RESEARCH INSTITUTE

                                          /s/ JOHN W. ROUSE
                                          -------------------------------------
                                          John W. Rouse, President & Chief 
                                          Executive Officer

                                          UAB RESEARCH FOUNDATION

                                          /s/ KENNETH J. ROOZEN
                                          -------------------------------------
                                          Kenneth J. Roozen, Executive Director

                                          CORIXA CORPORATION

                                          By: /s/ MARK MCDADE
                                             ----------------------------------
                                          Mark McDade, Chief Operating Officer


Southern Research Institute License Agreement

                                      -18-
<PAGE>   19
                                 SCHEDULE 1.14

                                 PATENT RIGHTS

The Southern Research Institute microsphere technology covered by the following
patents and patent applications:

- --------------------------------------------------------------------------------
    Patent No./App. No.         Country                 Filing/Issue Date
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Pat. No. [***]                    [***]         Issued [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Pat. No. [***]                    [***]         Issued [***]
- --------------------------------------------------------------------------------
Pat. No. [***]                    [***]         Issued [***]
- --------------------------------------------------------------------------------
Pat. No. [***]                    [***]          [***]                
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Pat. No. [***]                    [***]         Issued [***]
- --------------------------------------------------------------------------------
Pat. No. [***]                    [***]         Issued [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Pat. No. [***]                    [***]         Issued [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
                         
- --------------------------------------------------------------------------------
PAT. NO. [***]                    [***]         Issued [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Pat. No. [***]                    [***]         Issued [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                    [***]         Filed [***]
- --------------------------------------------------------------------------------

Southern Research Institute License License Agreement


                                      -19-
<PAGE>   20
- --------------------------------------------------------------------------------
Pat. No. [***]                   [***]          Issued [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                   [***]          Filed [***]
- --------------------------------------------------------------------------------
Pat. No. [***]                   [***]          Issued [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                   [***]          Filed [***]
- --------------------------------------------------------------------------------
Pat. No. [***]                   [***]          Issued [***]
- --------------------------------------------------------------------------------
Pat. No. [***]                   [***]          Issued [***]
- --------------------------------------------------------------------------------
Pat. No. [***]                   [***]          Issued [***]
- --------------------------------------------------------------------------------
Pat. No. [***]                   [***]          Issued [***]
- --------------------------------------------------------------------------------
                                             
- --------------------------------------------------------------------------------
PAT. NO. [***]                   [***]          ISSUED [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                   [***]          Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                   [***]          Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                   [***]          Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                   [***]          Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                   [***]          Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                   [***]          Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                   [***]          Filed [***]
- --------------------------------------------------------------------------------
Pat. No. [***]                   [***]          Issued [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                   [***]          Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                   [***]          Filed [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                   [***]          Filed [***]
- --------------------------------------------------------------------------------
Pat. No. [***]                   [***]          Issued [***]
- --------------------------------------------------------------------------------
Pat. No. [***]                   [***]          Issued [***]
- --------------------------------------------------------------------------------
Ser. No. [***]                   [***]          Filed [***]
- --------------------------------------------------------------------------------
Pat. No. [***]                   [***]          Issued [***]
- --------------------------------------------------------------------------------

Southern Research Institute License License Agreement


                                      -20-
<PAGE>   21
                                   EXHIBIT A

        (a)     Phase 1. (1) Phase 1 includes the initial introduction of an
investigational new drug into humans. Phase 1 studies are typically closely
monitored and may be conducted in patients or normal volunteer subjects. These
studies are designed to determine the metabolism and pharmacologic actions of
the drug in humans, the side effects associated with increasing doses, and, if
possible, to gain early evidence on effectiveness. During Phase 1, sufficient
information about the drug's pharmacokinetics and pharmacological effects should
be obtained to permit the design of well-controlled, scientifically valid, Phase
2 studies. The total number of subjects and patients included in Phase 1 studies
varies with the drug, but is generally in the range of 20 to 80.

        (2)     Phase 1 studies also include studies of drug metabolism,
structure-activity relationships, and mechanism of action in humans, as well as
studies in which investigational drugs are used as research tools to explore
biological phenomena or disease processes. 

        (b)     Phase 2. Phase 2 includes the controlled clinical studies
conducted to evaluate the effectiveness of the drug for a particular indication
or indications in patients with the disease or condition under study and to
determine the common short-term side effects and risks associated with the
drug. Phase 2 studies are typically well controlled, closely monitored, and
conducted in a relatively small number of patients, usually involving no more
than several hundred subjects.

        (c)     Phase 3. Phase 3 studies are expanded controlled and
uncontrolled trials. They are performed after preliminary evidence suggesting
effectiveness of the drug has been obtained, and are intended to gather the
additional information about effectiveness and safety that is needed to
evaluate the overall benefit-risk relationship of the drug and to provide an
adequate basis for physician labeling. Phase 3 studies usually include from
several hundred to several thousand subjects.
<PAGE>   22
                               EXHIBIT A (cont.)


Marketing application means an application for a new drug submitted under
section 505(b) of the Act, a request to provide for certification of an
antibiotic submitted under section 507 of the Act, or a product license
application for a biological product submitted under the Public Health Service 
Act.
<PAGE>   23
                                                                    EXHIBIT 3.5

                        INVESTMENT REPRESENTATION LETTER

        This Investment Representation Letter is delivered in connection with
the License Agreement dated May 22, 1996 (the "License Agreement") between
Southern Research Institute ("SRI"), University of Alabama at Birmingham
Research Foundation and Corixa Corporation ("Corixa"), which, among other
things, provides for the sale and issuance to SRI of Fifty Thousand (50,000)
shares of Corixa's common stock (the "Shares"). The undersigned, in connection
with the purchase of the Shares, hereby represents and warrants to Corixa as
follows:

        1.      Authority. It has the full power, right and authority to enter
into this Investment Representation Letter and all authorizations and
consents necessary for the execution and delivery of this Investment
Representation Letter have been given and all authorizations and approvals
required by law or contract with respect to its right and power to make the
representations and warranties set forth herein have been obtained.

        2.      Purchase Entirely for Own Account. It is acquiring the Shares
for its own account, not as a nominee or agent, and not with a view to the
resale or distribution of any part thereof. It has no present intention of
selling, granting any participation in, or otherwise distributing the Shares.
It does not have any contract, undertaking, agreement or arrangement with any
person to sell, transfer or grant participations to such person or to any third
person, with respect to any of the Shares.

        3.      Investment Experience. It has received all information
concerning Corixa that it has requested and has had the opportunity to obtain
additional information as desired in order to evaluate the merits and the risks
inherent in acquiring and holding the Shares. It is experienced and
knowledgeable in the business of Corixa and is able to bear the economic risk
and lack of liquidity inherent in holding the Shares.

        4.      Restricted Securities. It understands that the Shares are
characterized as "restricted securities" under the federal securities laws
inasmuch as they are being acquired from Corixa in a transaction not involving
a public offering and that under such laws and applicable regulations such
securities may be resold without registration under the Securities Act of
1933, as amended (the "Act"), only in certain limited circumstances. In this
connection, it represents that it is generally familiar with SEC Rule 144, as
presently in effect ("Rule 144"), and that it understands the resale
limitations imposed thereby and by the Act.

        5.      Further Limitations on Disposition. Without in any way limiting
the representations set forth above, it further agrees not to make any
disposition of all or any portion of the Shares unless:

                a.      There is then in effect a Registration Statement under
the Act covering such proposed disposition and such disposition is made in
accordance with such Registration Statement; or

                b.      (i) It has notified the Company of the proposed
disposition and has furnished the Company with a detailed statement of the
circumstances surrounding the proposed disposition, and (ii) if reasonably
requested by the Company, it has furnished the Company with an opinion of
counsel, reasonably satisfactory to the Company that such disposition will not
require registration of such shares under the Act; or

                c.      Such disposition is made pursuant to Rule 144.
<PAGE>   24

        6.      Legends. It is understood that the Shares may bear one or all
of the following legends:

                (a)     "These securities have not been registered under the
Securities Act of 1933, as amended (the "Act"). They may not be sold, offered
for sale, pledged, hypothecated or otherwise transferred in the absence of a
registration statement in effect with respect to the securities under such Act
or an opinion of counsel satisfactory to the Company that such registration is
not required or unless sold pursuant to Rule 144 of such Act."

                (b)     Any legend required by any applicable state laws.

        IN WITNESS WHEREOF, the undersigned has executed this Investment
Representation Letter effective as of May 22, 1996.


                                        SOUTHERN RESEARCH INSTITUTE


                                        By: ____________________________

                                        Its: ___________________________
<PAGE>   25
                                                                    Exhibit 3.6


THIS WARRANT AND THE SECURITIES ISSUABLE UPON THE EXERCISE HEREOF HAVE NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1993, AS AMENDED (THE "ACT"), OR ANY
STATE SECURITIES LAWS. THEY MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED,
HYPOTHECATED OR OTHERWISE TRANSFERRED IN THE ABSENCE OF A REGISTRATION
STATEMENT IN EFFECT WITH RESPECT TO THE SECURITIES UNDER SUCH ACT OR AN OPINION
OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED
OR UNLESS SOLD PURSUANT TO AN EXEMPTION TO SUCH ACT.


                                                                     Void after
                                                                   May __, 2006

                           WARRANT AGREEMENT FOR THE
                       PURCHASE OF SHARES OF COMMON STOCK

                                       of

                               CORIXA CORPORATION

              INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

        THIS CERTIFIES THAT, for value received, Southern Research Institute, a
non-profit corporation, having an address at 2000 Ninth Avenue South,
Birmingham, Alabama 35205 (the "Investor") is entitled to purchase, on the
terms hereof, up to Two Hundred Fifty Thousand (250,000) shares of Common Stock
(the "Common Stock") of Corixa Corporation, a Delaware corporation having its
principal offices at 1124 Columbia Street, Suite 464, Seattle, Washington 98104
(the "Company"), at the per share purchase price described in Section 1.4
below, subject to the provisions and upon the terms and conditions hereinafter
set forth. This Warrant is issued pursuant to the provisions of that certain
License Agreement between the Investor and the Company dated May __, 1996 (the
"License Agreement"), and all terms not otherwise defined herein shall have the
meaning ascribed to such terms in the License Agreement.

        1.      Exercise of Warrant. The terms and conditions upon which this
Warrant may be exercised, and the Common Stock covered hereby (the "Warrant
Stock") may be purchased, are as follows:

        1.1     Term; Acceleration. Subject to the terms hereof, this Warrant
may be exercised in part in accordance with each of subsections 1.2(a) and (b)
below, at any time following the occurrence of an event set forth in each
respective subsection, for the full number of shares of Warrant Stock set forth
in such subsection with respect to such event; provided, however, that in no
case may this Warrant be exercised later than 5:00 p.m. (Pacific Standard Time)
upon the earlier of (a) the close of business on May __, 2006, or (b)(i) the
closing of the acquisition of the Company by another entity by means of a
transaction or series of related transactions or (ii) the closing of the sale
of all or substantially all of the assets of the Company, unless the
<PAGE>   26
Company's stockholders of record prior to such acquisition or sale will hold at
least fifty percent (50%) of the voting power of the acquiring or surviving
entity immediately after such acquisition or sale (an event coming within this
subsection 1.1(b) being an "Acquisition"); provided further, however, that with
respect to both subsections 1.1(a) and (b) above, if (X) an Acquisition occurs
prior to May __, 2006 or (Y) the License Agreement has not either expired or
been terminated prior to May __, 2006, then notwithstanding Section 1.2 below,
the holder hereof shall have the right to exercise this Warrant for up to the
full 250,000 shares of Common Stock for which this Warrant is exercisable,
subject to adjustment pursuant to Section 2 hereof and subject to the term
limits set forth in this Section 1.1. At least ten (10) days prior to the
occurrence of an event specified in (a) or (b) of this Section 1.1, the Company
shall mail to the holder of this Warrant notice of such event and that such
holder's right to exercise this Warrant shall terminate upon the occurrence of
such event.

        1.2     Number of Shares. Subject to Section 1.1 hereof, this Warrant
is exercisable as follows:

                (a) For 25,000 shares of the Company's Common Stock at any time
        and each time following the execution of an agreement between the
        Company and any third party other than the Investor pursuant to which
        the Company has granted a sublicense under the License Agreement to a
        Sublicensee (each a "Sublicense"); provided, however, that this
        subsection 1.2(a) is limited to the first five (5) Sublicenses executed
        by the Company after the date hereof; and

                (b) For 25,000 shares of the Company's Common Stock at any time
        and each time following the initiation by the Company or any of its
        Sublicensees of Phase III clinical trials or the equivalent admissible
        in at least one (1) of the countries set forth in Section 3.4 of the
        License Agreement for a Licensed Product; provided, however, that this
        subsection 1.2(b) is limited to the first five such (5) Phase III
        clinical trials initiated after the date hereof;

        and provided further, however, that the above share numbers are also
subject to adjustment pursuant to Section 2 hereof.

        1.3     Termination of License Agreement. In the event the License
Agreement is terminated prior to May __, 2006 for any reason, the Investor
shall be entitled to exercise this Warrant for that number of shares of Common
Stock for which this Warrant is then exercisable in accordance with Sections
1.1 and 1.2 above based on the number of Sublicenses executed and/or Phase III
Trials initiated prior to such termination, subject to the term limits set
forth in Section 1.1 hereof; provided, however, that in the event the License
Agreement is terminated at any time on account of any uncured breach of such
License Agreement by the Investor, the Company shall have the right (the
"Repurchase Right"), at the Company's sole discretion, to repurchase all or any
portion of the shares of Common Stock purchased by the Investor upon exercise
of this Warrant which are then held by the Investor at a price per share equal
to the Warrant Price (as defined in Section 1.4 below); provided further,
however, the Company's Repurchase Right shall terminate when the Investor no
longer holds any shares of Common Stock.



                                       2

<PAGE>   27
        1.4     Purchase Price. The per share purchase price for the shares of
Common Stock to be issued upon exercise of this Warrant shall be $0.001 (the
"Warrant Price"), subject to adjustment as provided herein.

        1.5     Method of Exercise. The exercise of the purchase rights
evidenced by this Warrant shall be effected by (a) the surrender of the
Warrant, together with a duly executed copy of the form of subscription
attached hereto ("Subscription Notice"), to the Company at its principal
offices and (b) the delivery of the purchase price by check or bank draft
payable to the Company's order or by wire transfer to the Company's account for
the number of shares for which the purchase rights hereunder are being
exercised, or any other form of consideration approved by the Company's Board
of Directors. Each exercise of this Warrant shall be deemed to have been
effected immediately prior to the close of business on the day on which this
Warrant shall have been surrendered to the Company as provided herein or at
such latter date as may be specified in the executed Subscription Notice, and
at such time the person or persons in whose name or names any certificate or
certificates for shares of Common Stock shall be issuable upon such exercise as
provided herein shall be deemed to have become the holder or holders of record
thereof.

        1.6     Exercise by Exchange. In addition to and without limiting the
rights of the holder hereof under the terms hereof, this Warrant may be
exercised by being exchanged in whole or in part at any time or from time to
time prior to its expiration for a number of shares of Common Stock having an
aggregate fair market value on the date of such exercise equal to the difference
between (x) the fair market value of the number of shares of Common Stock
subject to this Warrant designated for exercise by the holder hereof on the date
of the exercise and (y) the aggregate Warrant Price for such shares in effect at
such time. The following diagram illustrates how many shares would then be
issued upon exercise pursuant to this Section 1.6:

<TABLE>
        <S>     <C>     <C>
        Let     FMV  =  Fair market value per share of Common Stock at date of exercise.
                PSP  =  Per share Warrant Price at date of exercise.
                N    =  Number of shares of Common Stock purchasable under the portion
                        of this Warrant being exercised pursuant to this Section 1.6.
                X    =  Number of shares of Common Stock to be issued to the holder
                        upon such exercise.

                     X  =   (FMV)(N)-(PSP)(N)
                            -----------------
                                   FMV
</TABLE>

Upon any such exercise, the number of shares of Common Stock purchasable upon
exercise of this Warrant shall be reduced by such designated number of shares
of Common Stock and, if a balance of purchasable shares of Common Stock remains
after such exercise, the Company shall execute and deliver to the holder hereof
a new Warrant for such balance of shares of Common Stock. No payment of any
cash or other consideration to the Company shall be required from the holder of
this Warrant in connection with any exercise of this Warrant by exchange
pursuant to this Section 1.6. Such exchange shall be effective upon the date of
receipt by the Company of the original Warrant surrendered for cancellation and
a written request from the holder hereof that the exchange pursuant to this
section be made, or at such later date as may be specified in such request. No
fractional shares arising out of the above formula for determining the number of


                                       3

<PAGE>   28

shares issuable in such exchange shall be issued, and the Company shall in lieu
thereof make payment to the holder hereof of cash in the amount of such
fraction multiplied by the fair market value of a share of Common Stock on the
date of the exchange. For the purposes of this Warrant, the "fair market value"
of any number of shares of Common Stock shall be calculated on the basis of (a)
if the Common Stock is then traded on a securities exchange, the average of the
closing prices of the Common Stock on such exchange over the 30-day period
ending three (3) days prior to the date of exercise, (b) if the Common Stock is
then regularly traded over-the-counter, the average of the sale prices or
secondarily the closing bid of the Common Stock over the 30-day period ending
three (3) days prior to the date of exercise, or (c) if there is no active
public market for the Common Stock, the fair market value thereof as determined
in good faith by the Board of Directors of the Company. In the event the holder
of this Warrant exercises this Warrant contingent upon the closing of the
initial registered public offering by the Company of its Common Stock effected
pursuant to a Registration Statement on Form S-1, Form SB-1 or Form SB-2 under
the Securities Act of 1933, as amended (the "Act") (the "Initial Public
Offering"), the "fair market value" of a share of Common Stock on the date of
exchange shall be equal to the "Initial Price to Public" specified in the final
prospectus with respect to such Initial Public Offering.

        1.7     Issuance of Shares. As soon as reasonably practicable after
each exercise of this Warrant in accordance with Sections 1.1 and 1.2 hereof,
and in any event within ten (10) days of the Company's receipt of a duly
executed Subscription Notice, the Company at its expense (including the payment
by it of any applicable issue taxes) will cause to be issued in the name of and
delivered to the holder hereof, or as such holder (upon payment by such holder
of any applicable transfer taxes) may direct,

                (a)     a certificate or certificates for the number of duly
authorized, validly issued, fully paid and nonassessable shares of Common Stock
to which such holder shall be entitled upon such exercise, and

                (b)     in case such exercise is in part in accordance with
Section 1.2 only, a new Warrant or Warrants of like tenor, representing the
portion of Warrant Stock with respect to which this Warrant shall not then have
been exercised.

        2.      Certain Adjustments.

        2.1     Mergers or Consolidations. If at any time there shall be a
capital reorganization (other than a combination or subdivision of Warrant
Stock otherwise provided for herein), or a merger or consolidation of the
Company with another corporation other than an Acquisition, then, as a part of
such reorganization, merger or consolidation, lawful provision shall be made so
that the Investor shall thereafter be entitled to receive upon exercise of this
Warrant, during the period specified in this Warrant and upon payment of the
Warrant Price, the number of shares of stock or other securities or property of
the Company or the successor corporation resulting from such reorganization,
merger or consolidation, to which a holder of the Common Stock deliverable upon
exercise of this Warrant would have been entitled under the provisions of the
agreement in such reorganization, merger or consolidation if this Warrant had
been exercised immediately before that reorganization, merger or consolidation.
In any such case, appropriate adjustment (as

                                       4
<PAGE>   29
determined in good faith by the Company's Board of Directors) shall be made in
the application of the provisions of this Warrant with respect to the rights
and interests of the Investor after the reorganization, merger or consolidation
to the end that the provisions of this Warrant (including adjustment of the
Warrant Price then in effect and the number of shares of Warrant Stock) shall
be applicable after that event, as near as reasonably may be, in relation to
any shares or other property deliverable after that event upon exercise of this
Warrant; provided, however, that the aggregate purchase price shall not be 
adjusted.

        2.2     Splits and Subdivisions; Dividends. In the event the Company
should at any time or from time to time fix a record date for the effectuation
of a split or subdivision of the outstanding shares of Common Stock or the
determination of the holders of Common Stock entitled to receive a dividend or
other distribution payable in additional shares of Common Stock or other
securities or rights convertible into, or entitling the holder thereof to
receive directly or indirectly, additional shares of Common Stock (hereinafter
referred to as the "Common Stock Equivalents") without payment of any
consideration by such holder for the additional shares of Common Stock or
Common Stock Equivalents (including the additional shares of Common Stock
issuable upon conversion or exercise thereof), then, as of such record date (or
the date of such distribution, split or subdivision if no record date is
fixed), the per share Warrant Price shall be appropriately decreased and the
number of shares of Warrant Stock shall be appropriately increased in
proportion to such increase (or potential increase) of outstanding shares;
provided, however, that the aggregate purchase price shall not be adjusted.

        2.3     Combination of Shares. If the number of shares of Common Stock
outstanding at any time after the date hereof is decreased by a combination of
the outstanding shares of Common Stock, the per share purchase price shall be
appropriately increased and the number of shares of Warrant Stock shall be
appropriately decreased in proportion to such decrease in outstanding shares;
provided, however, that the aggregate purchase price shall not be adjusted.

        2.4     Adjustments for Other Distributions.  In the event the Company
shall declare a distribution payable in securities of other persons, evidences
of indebtedness issued by the Company or other persons, assets (excluding cash
dividends) or options or rights not referred to in Section 2.2, then, in each
such case for the purpose of this Section 2.4, upon exercise of this Warrant
the holder hereof shall be entitled to a proportionate share of any such
distribution as though such holder was the holder of the number of shares of
Common Stock of the Company into which this Warrant may be exercised as of the
record date fixed for the determination of the holders of Common Stock of the
Company entitled to receive such distribution; provided, however, that the
aggregate purchase price shall not be adjusted.

        2.5     Certificate as to Adjustments. In the case of each adjustment
or readjustment of the purchase price pursuant to this Section 2, the Company
will promptly compute such adjustment or readjustment in accordance with the
terms hereof and cause a certificate setting forth such adjustment or
readjustment and showing in detail the facts upon which such adjustment or
readjustment is based to be delivered to the holder of this Warrant. The
Company will, upon the written request at any time of the holder of this
Warrant, furnish or cause to be furnished to such holder a certificate setting 
forth:


                                       5
<PAGE>   30
                (a)     Such adjustments and readjustments;

                (b)     The purchase price at the time in effect; and

                (c)     The number of shares of Warrant Stock and the amount,
if any, of other property at the time receivable upon the exercise of the 
Warrant.

        2.6     No Dilution or Impairment. The Company will not, by amendment
of its Amended and Restated Certificate of Incorporation or through any
consolidation, merger, reorganization, transfer of assets, dissolution, issue
or sale of securities or any other voluntary action, avoid or seek to avoid the
observance or performance of any of the terms of this Warrant, but will at all
times in good faith assist in the carrying out of all such terms and in the
taking of all such action as may be necessary or appropriate in order to
protect the rights of the holder of this Warrant against dilution or other 
impairment.

        2.7     Notices of Record Date, etc. In the event of:

                (a)     Any taking by the Company of a record of the holders of
any class of securities of the Company for the purpose of determining the
holders thereof who are entitled to receive any dividend (other than a cash
dividend payable out of earned surplus at the same rate as that of the last
such cash dividend theretofore paid) or other distribution, or any right to
subscribe for, purchase or otherwise acquire any shares of stock of any class
or any other securities or property, or to receive any other right; or

                (b)     Any capital reorganization of the Company, any
reclassification or recapitalization of the capital stock of the Company or any
transfer of all or substantially all of assets of the Company to any other
person or any consolidation or merger involving the Company; or

                (c)     Any voluntary or involuntary dissolution, liquidation
or winding-up of the Company, 

the Company will mail to the holder of this Warrant at least twenty (20) days
prior to the earliest date specified therein, a notice specifying:

                        (i)     The date on which any such record is to be
taken for the purpose of such dividends, distribution or right, and
the amount and character of such dividend, distribution or right; and

                        (ii)    The date on which any such reorganization,
reclassification, transfer, consolidation, merger, dissolution, liquidation or
winding-up is expected to become effective and the record date for determining
stockholders entitled to vote thereon.

        3.      Fractional Shares.      No fractional shares shall be issued in
connection with any exercise of this Warrant. In lieu of the issuance of such
fractional share, the Company shall make a cash payment equal to the then fair
market value of such fractional share as determined in good faith by the
Company's Board of Directors.


                                       6
<PAGE>   31
        4.      Privilege of Stock Ownership. Prior to the exercise of this
Warrant, the Investor shall not be entitled, by virtue of holding this Warrant,
to any rights of a stockholder of the Company, including (without limitation)
the right to vote, receive dividends or other distributions, exercise
preemptive rights or be notified of stockholder meetings, and such holder shall
not be entitled to any notice or other communication concerning the business or
affairs of the company. Nothing in this Section 4, however, shall limit the
right of the Investor to be provided the notices described in Section 2 hereof
or to participate in distributions described in Section 2 hereof if the
Investor ultimately exercises this Warrant.

        5.      Limitation of Liability. Except as otherwise provided herein,
in the absence of affirmative action by the holder hereof to purchase the
Warrant Stock, no mere enumeration herein of the rights or privileges of the
holder hereof shall give rise to any obligation or liability of such holder for
the purchase price or as a stockholder of the Company, whether such obligation
or liability is asserted by the Company or by creditors of the Company.

        6.      Representations and Warranties of the Company.

        6.1     Authorization. The Company has full power and authority to
enter into this Warrant. This Warrant has been duly authorized, executed and
delivered by the Company and constitutes its valid and legally binding
obligation, enforceable in accordance with its terms.

        6.2     Reservation of Common Stock. The Company shall at all times
reserve and keep available out of its authorized but unissued shares of Common
Stock, solely for the purpose of effecting the exercise of this Warrant, such
number of its shares of Common Stock as shall from time to time be sufficient
to effect the exercise of this Warrant, and if at any time the number of
authorized but unissued shares of Common Stock shall not be sufficient to effect
the exercise of the entire Warrant, in addition to such other remedies as shall
be available to the holder of this Warrant, the Company will use its reasonable
best efforts to take such corporate action as may, in the opinion of its
counsel, be necessary to increase its authorized but unissued shares of Common
Stock to such number of shares as shall be sufficient for such purposes.

        6.3     Valid Issuance. This Warrant, when issued ad delivered in
accordance with the terms hereof, and the Warrant Stock, when issued pursuant to
the terms hereof and upon payment of the exercise price, shall, upon such
issuance, be duly authorized, validly issued, fully paid and nonassessable.

        7.      Representations and Warranties of the Investor. The Investor
hereby represents and warrants to the Company with respect to the issuance of
the Warrant and the purchase of the Warrant Stock as follows:

        7.1     Authorization. The Investor has full power and authority to
enter into this Warrant. This Warrant has been duly authorized, executed and
delivered by such Investor and constitutes its valid and legally binding
obligation, enforceable in accordance with its terms.

        7.2     Purchase Entirely for Own Account. This Warrant is made with
the Investor in reliance upon such Investor's representation to the Company,
which by such Investor's execution


                                       7
<PAGE>   32
of this Warrant such Investor hereby confirms, that the Warrant and the
Warrant Stock will be acquired for investment for such Investor's own account,
not as a nominee or agent, and not with a view to the resale or distribution of
any part thereof, and that such Investor has no present intention of selling,
granting any participation in, or otherwise distributing the same. By executing
this Warrant, the Investor further represents that such Investor does not have
any contract, undertaking, agreement or arrangement with any person to sell,
transfer or grant participations to such person or to any third person, with
respect to the Warrant or the Warrant Stock.

        7.3     Investment Experience. The Investor is an institutional investor
in securities of companies in the development stage and acknowledges that it is
able to fend for itself, can bear the economic risk of its investment and has
such knowledge and experience in financial or business matters that it is
capable of evaluating the merits and risks of the investment in the Warrant and
the Warrant Stock. The Investor also represents it has not been organized solely
for the purpose of acquiring the Warrant or the Warrant Stock.

        7.4     Accredited Investor. Except as disclosed to the Company in
writing, the Investor is an accredited investor as defined in Rule 501(a) of
Regulation D, as amended, promulgated under the Act, and agrees not to sell,
hypothecate, pledge or otherwise dispose of any interest in the Warrant and the
Warrant Stock in the United States, its territories, possessions or any area
subject to its jurisdiction, or to any person who is a national thereof or
resident therein (including any estate of such person), or any corporation,
partnership or other entity created or organized therein, unless such
securities have been either registered under the Act, or are exempt from the
registration requirements of the Act, in an opinion of counsel satisfactory to
the Company, and the Investor has complied with any restrictions on transfer
contained in this Warrant.

        7.5     Restricted Securities. The Investor understands that the
Warrant being issued hereunder and the Warrant Stock to be purchased hereunder
are characterized as "restricted securities" under the federal securities laws
inasmuch as they are being acquired from the Company in a transaction not
involving a public offering and that under such laws and applicable
regulations, such securities may be resold without registration under the Act
only in certain limited circumstances. In this connection, the Investor
represents that it is familiar with SEC Rule 144, as presently in effect, and
understands the resale limitations imposed thereby and by the Act.

        7.6     Legends. It is understood that the certificates evidencing the
Warrant Stock may bear one or all of the following legends:

                1.      "THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR ANY STATE SECURITIES LAWS.
THEY MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED, HYPOTHECATED OR OTHERWISE
TRANSFERRED IN THE ABSENCE OF A REGISTRATION STATEMENT IN EFFECT WITH RESPECT
TO THE SECURITIES UNDER SUCH ACT OR AN OPINION OF COUNSEL SATISFACTORY TO THE
COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED OR UNLESS SOLD PURSUANT TO AN
EXEMPTION TO SUCH ACT."

                                       8
<PAGE>   33

                2.      Any legend required by the laws of any state in which
the securities will be issued.

        7.7     Consents. No consent, approval or authorization of or
designation, declaration or filing with any state, federal or foreign
governmental authority on the part of the Investor is required in connection
with the valid execution and delivery of this Warrant and the consummation of
the transactions contemplated hereby.

        8.      Market Stand-Off Agreement. The Investor hereby agrees that,
during the period of duration specified by the Company or an underwriter of
capital stock or other securities of the Company, following the effective date
of a registration statement of the Company filed under the Act, it shall not,
to the extent requested by the Company and such underwriter, directly or
indirectly sell, offer to sell, contract to sell (including, without
limitation, any short sale), grant any option to purchase or otherwise transfer
or dispose of (other than to donees who agree to be similarly bound) any
securities of the Company held by it at any time during such period except
Common Stock included in such registration; provided, however, that:

                (a)     all executive officers and directors of the Company and
all other persons with registration rights enter into similar agreements; and

                (b)     such period shall not exceed one hundred eighty (180)
days beginning the day after the effective date of such registration statement.

                In order to enforce the foregoing covenant, the Company may
impose stop-transfer instructions with respect to the Warrant Stock of the
Investor until the end of such period.

        9.      Transfers and Exchanges.

        9.1     This Warrant shall not be transferable without the prior
written consent of the Company.

        9.2     All new warrants issued in connection with transfers or
exchanges shall be identical in form and provision to this Warrant except as to
the number of shares of Warrant Stock.

        9.3     It shall be a condition to any transfer or exercise of this
Warrant that the Company shall have received, at the time of such transfer or
exercise, a statement in writing of the pertinent facts covering any proposed
distribution thereof. It shall be a further condition to any transfer of this
Warrant or of any or all of the shares of Common Stock issued upon exercise of
this Warrant, other than a transfer registered under the Act, that the Company
shall have received (i) a legal opinion, in form and substance satisfactory to
the Company and its counsel, reciting the pertinent circumstances surrounding
the proposed transfer and stating that such transfer is exempt from the
prospectus and the registration requirements of the Act and (ii) a statement in
writing from, and signed by, any proposed transferees containing the same
representations and warranties as set forth in Section 7 hereof. The
requirement of a legal opinion shall not apply to the transfer of this Warrant
or any part thereof to a partnership of which the Investor is a partner or to
the beneficial owners or affiliates of such partnership without further
consideration, so long as such transfer is in

                                       9
<PAGE>   34
compliance with applicable securities laws. Each certificate evidencing the
shares of Common Stock issued upon exercise of this Warrant, or upon any
transfer of such shares (other than a transfer registered under the Act or any
subsequent transfer of shares so registered) shall, at the option of the
Company, contain a legend, in form and substance satisfactory to the Company
and its counsel, restricting the transfer of such shares to sales or other
dispositions exempt from the requirements of the Act.

        It shall be a further condition to each such transfer that the
transferee shall receive and accept a Warrant, of like tenor and date, executed
by the Company.

        10.     Successors and Assigns. The terms and provisions of this Warrant
shall be binding upon the Company and the Investor and their respective
successors and assigns, subject at all times to the restrictions set forth
herein.

        11.     Loss, Theft, Destruction or Mutilation of Warrant. Upon receipt
by the Company of evidence reasonably satisfactory to it of the loss, theft,
destruction or mutilation of this Warrant, and in case of loss, theft or
destruction, of indemnity or security reasonably satisfactory to the Company,
and upon reimbursement to the Company of all reasonable expenses incidental
thereto, and upon surrender and cancellation of this Warrant, if mutilated, the
Company will make and deliver a new warrant of like tenor and dated as of such
cancellation, in lieu of this Warrant.

        12.     Saturdays, Sundays, Holidays, etc. If the last or appointed day
for the taking of any action or the expiration of any right required or
granted herein shall be a Saturday or Sunday or shall be a legal holiday, then
such action may be taken or such right may be exercised on the next succeeding
day not a legal holiday.

        13.     Amendments and Waivers. Any term of this Warrant may be amended
and the observance of any term of this Warrant may be waived (either generally
or in a particular instance and either retroactively or prospectively), only
with the written consent of the Company and the Investor. Any such amendment or
waiver shall be binding on the parties.

        14.     Notices. All notices and other communications under this
Warrant shall be in writing and shall be mailed by registered or certified
mail, return receipt requested, or by a nationally recognized overnight
courier, specifying next day delivery, with written verification of receipt,
and shall be addressed (a) if to any holder of any Warrant, at the registered
address of such holder as set forth in the register kept at the principal
office of the Company, or (b) if to the Company, to the attention of its
President at its principal office; provided, however, that the exercise of any
Warrant shall be effective in the manner provided in Section 1 hereof.

        15.     Registration Rights. The Company hereby agrees to do and take
all actions necessary to amend the Company's Amended and Restated Investors'
Rights Agreement dated December 2, 1994 (the "Rights Agreement") to include the
Warrant Stock to be issued upon exercise of this Warrant in the definition of
Registrable Securities (the "Amendment") by no later than June 15, 1996.

                                       10
<PAGE>   35
        16.     Governing Law. The terms and conditions of this Warrant shall be
governed by and construed in accordance with Delaware law as such laws are
applied to agreements which are entered into solely between Delaware residents
and are to be performed entirely within the state.


Dated: May __, 1996                             CORIXA CORPORATION


                                                By:___________________________

                                                Name:_________________________

                                                Title:________________________

                                                Address:  1124 Columbia Street
                                                          Suite 464
                                                          Seattle, WA 98104

ACKNOWLEDGED AND AGREED

SOUTHERN RESEARCH INSTITUTE


By:_____________________________

Name:___________________________

Title:__________________________

Address:  2000 Ninth Avenue South
          Birmingham, AL 35205




                  SIGNATURE PAGE TO WARRANT TO PURCHASE UP TO
                         250,000 SHARES OF COMMON STOCK
                             OF CORIXA CORPORATION



<PAGE>   1
 
                                                                    EXHIBIT 23.1
 
               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
   
     We consent to the reference to our firm under the captions "Selected
Financial Data" and "Experts" and to the use of our report dated January 31,
1997, except for paragraph 1 of Note 11, as to which the date is September 24,
1997, in Amendment No. 3 to the Registration Statement (Form S-1) and related
Prospectus of Corixa Corporation for the registration of 3,162,500 shares of its
Common Stock.
    
 
   
                                                 /s/ ERNST & YOUNG LLP
    
 
Seattle, Washington
   
September 26, 1997
    

<PAGE>   1
 
                                                                    EXHIBIT 23.2
 
               CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANT
 
The Board of Directors
Corixa Corporation:
 
     We consent to the use of our report included herein and to the reference to
our firm under the headings "Selected Financial Data" and "Experts" in the
prospectus.
 
                                               /s/ KPMG Peat Marwick LLP
 
Seattle, Washington
   
September 26, 1997
    


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