PROGENICS PHARMACEUTICALS INC
S-1/A, 1996-11-12
PHARMACEUTICAL PREPARATIONS
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<PAGE>
   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 12, 1996
    
 
                                                      REGISTRATION NO. 333-13627
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                             ---------------------
 
   
                                AMENDMENT NO. 2
                                       TO
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
    
 
                        PROGENICS PHARMACEUTICALS, INC.
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<S>                              <C>                            <C>
           DELAWARE                          2834                  13-3379479
 (State or other jurisdiction    (Primary Standard Industrial   (I.R.S. Employer
              of                 Classification Code Number)     Identification
incorporation or organization)                                        No.)
</TABLE>
 
                          777 OLD SAW MILL RIVER ROAD
                           TARRYTOWN, NEW YORK 10591
                                 (914) 789-2800
       (Address, including zip code and telephone number, including area
               code, of registrant's principal executive offices)
 
                          PAUL J. MADDON, M.D., PH.D.
          CHAIRMAN OF THE BOARD, CHIEF EXECUTIVE OFFICER AND PRESIDENT
                        PROGENICS PHARMACEUTICALS, INC.
                          777 OLD SAW MILL RIVER ROAD
                           TARRYTOWN, NEW YORK 10591
                                 (914) 789-2800
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
 
                           --------------------------
 
COPIES OF ALL COMMUNICATIONS, INCLUDING ALL COMMUNICATIONS SENT TO THE AGENT FOR
                          SERVICE, SHOULD BE SENT TO:
 
         MARK R. BAKER, ESQ.                      DAVID E. REDLICK, ESQ.
           DEWEY BALLANTINE                           HALE AND DORR
     1301 AVENUE OF THE AMERICAS                     60 STATE STREET
       NEW YORK, NEW YORK 10019                BOSTON, MASSACHUSETTS 02109
            (212) 259-8000                            (617) 526-6000
 
                           --------------------------
 
        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 THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
   
                 SUBJECT TO COMPLETION, DATED NOVEMBER 12, 1996
    
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.
<PAGE>
   
                                2,000,000 SHARES
    
 
   
                                 [COMPANY LOGO]
                        Progenics Pharmaceuticals, Inc.
    
                                  COMMON STOCK
                                 --------------
 
   
    All of the shares of Common Stock offered hereby are being sold by Progenics
Pharmaceuticals, Inc. ("Progenics" or the "Company"). Prior to this offering,
there has been no public market for the Common Stock of the Company. It is
anticipated that the initial public offering price will be between $11.00 and
$13.00 per share. See "Underwriting" for a discussion of the factors to be
considered in determining the initial public offering price. The Common Stock
has been approved for quotation on the Nasdaq National Market, upon notice of
issuance, under the symbol "PRGN."
    
 
          THE COMMON STOCK OFFERED HEREBY INVOLVES 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>
<CAPTION>
                                                          PRICE TO          UNDERWRITING        PROCEEDS TO
                                                           PUBLIC           DISCOUNT(1)          COMPANY(2)
<S>                                                  <C>                 <C>                 <C>
Per Share..........................................          $                   $                   $
Total(3)...........................................          $                   $                   $
</TABLE>
 
(1) See "Underwriting" for information concerning indemnification of the
    Underwriters and other information.
 
(2) Before deducting expenses of the offering payable by the Company estimated
    at $750,000.
 
(3) The Company has granted the Underwriters an option, exercisable within 30
    days of the date hereof, to purchase up to 300,000 additional shares of
    Common Stock at the Price to Public per share, less the Underwriting
    Discount, for the purpose of covering over-allotments, if any. If the
    Underwriters exercise such option in full, the total Price to Public,
    Underwriting Discount and Proceeds to Company will be $         , $
    and $         , respectively. See "Underwriting."
                              -------------------
 
    The shares of Common Stock are offered severally by the Underwriters when,
as and if delivered to and accepted by them, subject to their right to withdraw,
cancel or reject orders in whole or in part and subject to certain other
conditions. It is expected that delivery of the certificates representing the
shares will be made against payment on or about             , 1996 at the office
of Oppenheimer & Co., Inc., Oppenheimer Tower, World Financial Center, New York,
New York 10281.
 
                              -------------------
 
OPPENHEIMER & CO., INC.                    VECTOR SECURITIES INTERNATIONAL, INC.
 
               The date of this Prospectus is             , 1996
<PAGE>
GMK GANGLIOSIDE CONJUGATE VACCINE IS PROGENICS' LEAD CANCER THERAPEUTIC
CANDIDATE.
GMK HAS ENTERED PIVOTAL PHASE III CLINICAL TRIALS FOR THE TREATMENT OF MALIGNANT
MELANOMA.
 
      [DIAGRAM DEPICTING THE COMPANY'S GANGLIOSIDE CONJUGATE VACCINE, GMK]
 
                            ------------------------
 
    The Company was incorporated in December 1986. Its principal executive
offices are located at 777 Old Saw Mill River Road, Tarrytown, New York 10591
and its telephone number is (914) 789-2800.
                            ------------------------
 
    IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK OF
THE COMPANY AT A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN
MARKET. SUCH TRANSACTIONS MAY BE EFFECTED ON THE NASDAQ NATIONAL MARKET, IN THE
OVER-THE-COUNTER MARKET OR OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE
DISCONTINUED AT ANY TIME.
                            ------------------------
<PAGE>
                               PROSPECTUS SUMMARY
 
    THE FOLLOWING SUMMARY IS QUALIFIED IN ITS ENTIRETY BY THE MORE DETAILED
INFORMATION AND FINANCIAL STATEMENTS AND RELATED NOTES APPEARING ELSEWHERE IN
THIS PROSPECTUS. UNLESS OTHERWISE INDICATED, ALL INFORMATION IN THIS PROSPECTUS:
(I) ASSUMES NO EXERCISE OF THE UNDERWRITERS' OVER-ALLOTMENT OPTION; (II) GIVES
EFFECT TO A THREE-FOR-FOUR REVERSE STOCK SPLIT WITH RESPECT TO THE COMPANY'S
COMMON STOCK, PAR VALUE $.0013 (THE "COMMON STOCK"), TO BE EFFECTED PRIOR TO THE
COMPLETION OF THIS OFFERING; AND (III) GIVES EFFECT TO THE AUTOMATIC CONVERSION
OF ALL OUTSTANDING SHARES OF THE COMPANY'S PREFERRED STOCK, PAR VALUE $.001 PER
SHARE (THE "PREFERRED STOCK"), INTO AN AGGREGATE OF 4,259,878 SHARES OF COMMON
STOCK. SEE "CAPITALIZATION," "DESCRIPTION OF CAPITAL STOCK" AND "NOTES TO
FINANCIAL STATEMENTS." INVESTMENT IN THE SECURITIES OFFERED HEREBY INVOLVES A
HIGH DEGREE OF RISK.
 
                                  THE COMPANY
 
    Progenics Pharmaceuticals, Inc. ("Progenics" or the "Company") is a
biopharmaceutical company focusing on the development and commercialization of
innovative products for the treatment and prevention of cancer and viral
diseases. The Company applies its immunology expertise to develop
biopharmaceuticals that induce an immune response or that mimic natural immunity
in order to fight cancers, such as malignant melanoma, and viral diseases, such
as human immunodeficiency virus ("HIV") infection. Progenics' most advanced
product candidate, GMK, is a therapeutic vaccine that is undergoing pivotal
Phase III clinical trials for the treatment of melanoma, a deadly form of skin
cancer. Progenics' second vaccine product, MGV, is being developed for the
treatment of various cancers, and recently entered Phase I/II clinical trials.
Based on its participation in the discoveries of two major receptors for HIV,
the Company is engaged in research and development of several therapeutic
products designed to block entry of the virus into human immune system cells.
Progenics has completed preclinical studies on two HIV product candidates, PRO
542 and PRO 367, and plans to initiate Phase I/II clinical trials of these
products in 1997.
 
    Progenics' most advanced product candidates are based on two proprietary
technologies: ganglioside conjugate vaccine technology, which the Company uses
in its cancer program; and universal antiviral binding agent ("UnAB")
technology, which the Company uses in its HIV program. The Company has
exclusively licensed from Memorial Sloan-Kettering Cancer Center
("Sloan-Kettering") several ganglioside conjugate vaccines designed to stimulate
the immune system to destroy cancer cells. The Company applies its UnAB
technology to produce antibody-like molecules designed to neutralize or destroy
HIV or HIV-infected cells.
 
    CANCER THERAPEUTICS
 
    GMK is a therapeutic cancer vaccine designed to prevent recurrence of
melanoma in patients who are at risk of relapse after surgery. Developed at
Sloan-Kettering, GMK is composed of a ganglioside antigen which is abundant in
melanoma cells, conjugated to an immunogenic carrier protein and combined with
an adjuvant (an immunological stimulator). In August 1996, the Company commenced
the first of three pivotal, randomized, multicenter Phase III clinical trials of
GMK. These studies are being conducted in the United States by the Eastern
Cooperative Oncology Group ("ECOG") and the Southwest Oncology Group ("SWOG"),
which are cooperative cancer research groups supported by the National Cancer
Institute ("NCI"). Two international Phase III clinical trials will be initiated
in 1997 and will be conducted in Europe by the Institute of Cancer Research
("ICR") of the United Kingdom and the European Organization for Research and
Treatment of Cancer ("EORTC").
 
    MGV, the Company's second ganglioside conjugate vaccine, incorporates two
ganglioside antigens that are abundant in a wide range of cancer cells. These
cancers include colorectal cancer, lymphoma, small cell lung cancer, sarcoma,
gastric cancer, neuroblastoma and melanoma. In September 1996, MGV entered Phase
I/II clinical trials at Sloan-Kettering.
 
                                       3
<PAGE>
    HIV THERAPEUTICS
 
    The Company is pursuing two approaches based on its HIV receptor technology
in the research and development of products designed to block viral entry into
human immune system cells. The Company's UnAB approach is based on the CD4
receptor while its HIV fusion approach is based on a recently discovered second
receptor for the virus, CC-CKR-5 ("CKR-5").
 
    Progenics is developing PRO 542 to selectively target HIV and prevent it
from infecting healthy cells by binding to the sites on the virus that are
required for entry into the cell. PRO 542 is based on Progenics' UnAB technology
and has been shown IN VITRO to recognize a wide range of HIV strains, including
those most prevalent in the United States and the rest of the world. PRO 542 is
being developed as an immunotherapy to treat HIV-positive individuals and as an
immunoprophylactic treatment to prevent infection of individuals who have been
exposed to the virus. The Company plans to file an investigational new drug
application ("IND") covering PRO 542 by the end of 1996 and initiate Phase I/II
clinical trials in 1997.
 
    Progenics is developing PRO 367 as a therapeutic agent designed to kill
HIV-infected cells. PRO 367 consists of a UnAB molecule linked to a therapeutic
radioisotope and is designed to bind to and destroy HIV-infected cells by
delivering a lethal dose of radioactivity. The Company plans to begin Phase I/II
clinical trials of PRO 367 in 1997.
 
    In June 1996, the Company's scientists in collaboration with researchers at
The Aaron Diamond AIDS Research Center ("ADARC") described in an article
published in NATURE the discovery of a second receptor for HIV, CKR-5. This
receptor enables fusion of HIV with the cell membrane, entry of the viral
genetic information into the cell and initiation of viral replication. The
Company is using its proprietary ProSys assay in a program to discover novel
therapeutics that specifically inhibit the interaction of HIV with the CKR-5
receptor, thereby blocking viral fusion and entry.
 
    BUSINESS STRATEGY
 
   
    The Company's business strategy is to develop and commercialize innovative
products for cancer and viral diseases which the Company believes would meet a
significant need of those individuals suffering from these diseases and which
the Company also believes have the potential to generate substantial revenues.
The Company intends to accomplish this strategy by capitalizing on its
proprietary technologies and its expertise in product development and clinical
trials. Key elements of this strategy include: collaborating with leading
academic and government-supported institutions and clinical groups to control
the Company's research and clinical trial expenditures; licensing from
institutions and other companies promising technologies and product candidates
to minimize basic research costs and overhead; and, maximizing the Company's
share of revenues from products that are brought to market by initiating
clinical trials of product candidates, when appropriate, prior to establishing
collaborations with pharmaceutical companies. Consistent with this strategy,
Progenics has limited its corporate infrastructure and operating costs while
developing four product candidates that have entered, or are about to enter,
clinical trials.
    
 
                                       4
<PAGE>
                                  THE OFFERING
 
<TABLE>
<S>                                            <C>
Common Stock offered by the Company..........  2,000,000 shares
Common Stock to be outstanding after the
  offering...................................  8,554,553 shares (1)
Use of proceeds..............................  To fund clinical trials of its leading
                                               product candidates, research and development,
                                               in-licensing of late-stage technology and for
                                               working capital and general corporate
                                               purposes.
Proposed Nasdaq National Market symbol.......  PRGN
Risk Factors.................................  This offering involves a high degree of risk.
                                               See "Risk Factors."
</TABLE>
 
- ------------------------
 
(1) Based on the number of shares outstanding at September 30, 1996. Excludes
    2,051,691 shares of Common Stock reserved as of such date for issuance
    pursuant to outstanding options under the Company's stock option plans and
    pursuant to outstanding warrants and 62,775 shares subject to options to be
    granted prior to the completion of this offering at an exercise price equal
    to the initial public offering price. See "Capitalization" and "Description
    of Capital Stock."
 
                             SUMMARY FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                                                DECEMBER 1,
                                                                                          NINE MONTHS ENDED        1986
                                                                                                                (INCEPTION)
                                                           YEARS ENDED DECEMBER 31,         SEPTEMBER 30,         THROUGH
                                                        -------------------------------  --------------------  SEPTEMBER 30,
                                                          1993       1994       1995       1995       1996         1996
                                                        ---------  ---------  ---------  ---------  ---------  -------------
<S>                                                     <C>        <C>        <C>        <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA:
Revenues:
  Research grants.....................................  $      84  $     504  $     725  $     502  $     268   $     1,735
  Product sales.......................................         50         52         50         40         67           358
  Interest income.....................................         53        108         46         44         91           633
                                                        ---------  ---------  ---------  ---------  ---------  -------------
    Total revenues....................................        187        664        821        586        426         2,726
                                                        ---------  ---------  ---------  ---------  ---------  -------------
Expenses:
  Research and development............................      1,547      2,859      3,853      2,585      2,654        15,505
  General and administrative..........................        748        878      1,094        790        984         6,257
  Interest expense....................................         38         50         87         53         40           440
  Depreciation and amortization.......................        249        289        291        229        230         1,663
                                                        ---------  ---------  ---------  ---------  ---------  -------------
    Total expenses....................................      2,582      4,076      5,325      3,657      3,908        23,865
                                                        ---------  ---------  ---------  ---------  ---------  -------------
Net loss..............................................  $  (2,395) $  (3,412) $  (4,504) $  (3,071) $  (3,482)  $   (21,139)
                                                        ---------  ---------  ---------  ---------  ---------  -------------
                                                        ---------  ---------  ---------  ---------  ---------  -------------
Pro forma net loss per common share(2)................                        $   (0.73)            $   (0.57)
                                                                              ---------             ---------
                                                                              ---------             ---------
Pro forma weighted average common shares
  outstanding(2)......................................                            6,135                 6,135
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                              SEPTEMBER 30, 1996
                                                                                           -------------------------
                                                                                            ACTUAL    AS ADJUSTED(3)
                                                                                           ---------  --------------
<S>                                                                                        <C>        <C>
BALANCE SHEET DATA:
Cash and cash equivalents................................................................  $   1,746    $   23,316
Working capital..........................................................................        894        22,464
Total assets.............................................................................      2,841        24,411
Capital lease obligations and deferred lease liability, long-term portion................        181           181
Total stockholders' equity...............................................................      1,668        23,238
</TABLE>
 
- ------------------------
 
(2) See Note 2 to the Company's Financial Statements for information concerning
    computation of the pro forma per share data.
 
(3) As adjusted to reflect the sale of 2,000,000 shares of Common Stock offered
    by the Company hereby, assuming an initial public offering price of $12.00
    per share, and the receipt of the net proceeds therefrom after deducting the
    underwriting discount and estimated offering expenses. See "Use of
    Proceeds."
 
                                       5
<PAGE>
                                  RISK FACTORS
 
   
    AN INVESTMENT IN THE SHARES OF COMMON STOCK OFFERED HEREBY IS SPECULATIVE IN
NATURE AND INVOLVES A HIGH DEGREE OF RISK. IN ADDITION TO THE OTHER INFORMATION
CONTAINED IN THIS PROSPECTUS, THE FOLLOWING FACTORS SHOULD BE CONSIDERED
CAREFULLY IN EVALUATING THE COMPANY AND ITS BUSINESS BEFORE PURCHASING THE
SHARES OF COMMON STOCK OFFERED HEREBY. THIS PROSPECTUS CONTAINS CERTAIN
FORWARD-LOOKING STATEMENTS. ANY STATEMENTS CONTAINED HEREIN THAT ARE NOT
STATEMENTS OF HISTORICAL FACT MAY BE DEEMED TO BE FORWARD-LOOKING STATEMENTS.
FOR EXAMPLE, THE WORDS "BELIEVES," "ANTICIPATES," "PLANS," "EXPECTS," "INTENDS"
AND SIMILAR EXPRESSIONS ARE INTENDED TO IDENTIFY FORWARD-LOOKING STATEMENTS.
THERE ARE A NUMBER OF IMPORTANT FACTORS, INCLUDING THE RISK FACTORS SET FORTH
BELOW, THAT COULD CAUSE THE COMPANY'S ACTUAL RESULTS TO DIFFER MATERIALLY FROM
THOSE INDICATED BY SUCH FORWARD-LOOKING STATEMENTS.
    
 
EARLY STAGE OF PRODUCT DEVELOPMENT; TECHNOLOGICAL UNCERTAINTIES
 
    The Company is in the development stage, and the development of any products
will require significant further research, development, testing and regulatory
approvals and additional investment prior to commercialization. Substantially
all of the Company's resources have been, and for the foreseeable future will
continue to be, dedicated to the development of products for cancer and viral
diseases, most of which are still in the early stages of development and
testing. There are a number of technological challenges that the Company must
successfully address to complete most of its development efforts. In addition,
the product development programs conducted by the Company and its collaborators
are subject to the risks of failure inherent in the development of product
candidates based on new technologies. These risks include the possibility that
the technologies used by the Company will prove to be ineffective or any or all
of the Company's product candidates will prove to be unsafe or otherwise fail to
receive necessary regulatory approvals; that the product candidates, if safe and
effective, will be difficult to manufacture on a large scale or uneconomical to
market; that the proprietary rights of third parties will preclude the Company
or its collaborators from marketing the products utilizing the Company's
technologies; or that third parties will market superior or equivalent products.
To the Company's knowledge, no cancer or therapeutic vaccine and no genetically
engineered antibody for the treatment of HIV infection has been approved for
marketing and there can be no assurance that any of the Company's products will
be successfully developed. The commercial success of the Company's products,
when and if approved for marketing by the U.S. Food and Drug Administration (the
"FDA"), will depend upon their acceptance by the medical community and third
party payors as clinically useful, cost-effective and safe. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations,"
"Business--Product Development," "--Manufacturing," "--Government Regulation"
and "--Competition."
 
UNCERTAINTY ASSOCIATED WITH PRECLINICAL AND CLINICAL TESTING
 
    The grant of regulatory approvals for the commercial sale of any of the
Company's potential products will depend on the Company successfully conducting
extensive preclinical and clinical testing to demonstrate their safety and
efficacy in humans. The results of preclinical studies by the Company and/or its
collaborators may be inconclusive and may not be indicative of results that will
be obtained in human clinical trials. In addition, results attained in early
human clinical trials relating to the products under development by the Company
may not be indicative of results that will be obtained in later clinical trials.
As results of particular preclinical studies and clinical trials are received by
the Company, the Company may abandon projects which it might otherwise have
believed to be promising, some of which may be described in this Prospectus.
 
    Although human clinical trials have commenced with respect to the
development of GMK and MGV, the Company is developing other therapeutic
products, including PRO 542 and PRO 367, on which it plans to file INDs with the
FDA or make equivalent filings outside of the U.S., and there can be no
assurance that necessary preclinical studies on these products will be completed
satisfactorily or that the Company otherwise will be able to make its intended
filings. Further, there can be no assurance that the Company
 
                                       6
<PAGE>
   
will be permitted to undertake and complete human clinical trials of any of the
Company's potential products, either in the U.S. or elsewhere, or, if such
trials are permitted, that such products will not have undesirable side effects
or other characteristics that may prevent them from being approved or limit
their commercial use if approved. Clinical testing is very expensive and the
Company will have to devote substantial resources for the payment of clinical
trial expenses.
    
 
   
    The rate of completion of the Company's human clinical trials, if permitted,
will be dependent upon, among other factors, the rate of patient enrollment.
Patient enrollment is a function of many factors, including the size of the
patient population, the nature of the protocol, the availability of alternative
treatments, the proximity to clinical sites and the eligibility criteria for the
study. Delays in planned patient enrollment might result in increased costs and
delays, which could have a material adverse effect on the Company. The Company
or the FDA or other regulatory agencies may suspend clinical trials at any time
if the subjects or patients participating in such trials are being exposed to
unacceptable health risks. In addition, clinical trials are often conducted with
patients having the most advanced stages of disease. During the course of
treatment, these patients can suffer adverse medical effects or die for reasons
that may not relate to the product being tested, but which can nevertheless
affect adversely the clinical trials. In addition, there can be no assurance
that clinical trials of products under development will demonstrate safety and
efficacy at all or to the extent necessary to obtain regulatory approvals.
Companies in the biotechnology industry have suffered significant setbacks in
advanced clinical trials, even after obtaining promising results in earlier
trials. Consequently, the period of time necessary to complete clinical testing
and receive regulatory approval can be quite extensive and involve many years.
The failure to adequately demonstrate the safety and efficacy of a therapeutic
product under development could delay or prevent regulatory approval of the
product and would have a material adverse effect on the Company.
    
 
    Lastly, the Company has limited experience in conducting clinical trials.
The Company relies, in part, on academic institutions and on clinical research
organizations to conduct and monitor certain clinical trials. There can be no
assurance that such entities will conduct the clinical trials successfully. In
addition, certain clinical trials for the Company's products will be conducted
by government-sponsored agencies. Because the conduct of such trials will be
dependent on government participation and funding, the Company will have less
control over such trials than if the Company were the sole sponsor thereof. As a
result, there can be no assurance that these trials will commence or be
completed as planned. See "Business--Product Development," "--Cancer
Therapeutics," "--HIV Therapeutics" and "--Government Regulation."
 
HISTORY OF OPERATING LOSSES AND ACCUMULATED DEFICIT; NO PRODUCT REVENUE AND
 
UNCERTAINTY OF FUTURE PROFITABILITY
 
    The Company has incurred substantial losses in each year since its
inception. As of September 30, 1996, the Company had an accumulated deficit of
approximately $21 million. Such losses have resulted principally from costs
incurred in the Company's research and development programs and general and
administrative costs associated with the Company's development. The Company has
derived only limited revenues from federal research grants and from the sale of
research reagents. No revenues have been generated by the Company from product
sales (other than for research purposes) or royalties and no product sales
(other than sales of research reagents) or royalties are likely for a number of
years, if ever. The Company expects to incur additional operating losses over at
least the next several years and expects losses in the future to increase
significantly as the Company expands development and clinical trial efforts. The
Company expects that losses will fluctuate from quarter to quarter and that such
fluctuations may be substantial. The Company's ability to achieve profitability
is dependent in part on obtaining regulatory approvals for products and entering
into agreements for commercialization of such products. There can be no
assurance that such regulatory approvals will be obtained or such agreements
will be entered into. Further, there can be no assurances that the Company's
operations will become profitable even if products
 
                                       7
<PAGE>
under development by the Company or any collaborators are commercialized. See
"Selected Financial Data" and "Management's Discussion and Analysis of Financial
Condition and Results of Operations."
 
NEED FOR ADDITIONAL FINANCING AND UNCERTAIN ACCESS TO CAPITAL FUNDING
 
    Progenics' current development projects require substantial capital. The
Company believes that the net proceeds of this offering, together with the
Company's present capital resources, should be sufficient to fund operations
through the end of 1998 based on the Company's current operating plan. No
assurance can be given that there will be no change that would consume the
Company's liquid assets before such time. Thereafter, the Company will require
substantial funds in addition to the net proceeds of this offering to conduct
development activities, preclinical studies, clinical trials and other
activities relating to the commercialization of any potential products. The
Company anticipates that these funds will be obtained from external sources and
intends to seek additional financing to fund future operations. There can be no
assurance, however, that the Company will be able to negotiate such arrangements
or obtain the additional funds it will require on acceptable terms, if at all.
In addition, the Company's cash requirements may vary materially from those now
planned because of results of research and development, results of product
testing, potential relationships with in-licensors and collaborators, changes in
the focus and direction of the Company's research and development programs,
competitive and technological advances, the cost of filing, prosecuting,
defending and enforcing patent claims, the regulatory approval process,
manufacturing, marketing and other costs associated with the commercialization
of products following receipt of regulatory approvals and other factors.
 
    If adequate funds are not available, the Company may be required to delay,
reduce the scope of or eliminate one or more of its programs; to obtain funds
through arrangements with collaborative partners or others that may require the
Company to relinquish rights to certain of its technologies, product candidates
or products that the Company would otherwise seek to develop or commercialize
itself; or to license the rights to such products on terms that are less
favorable to the Company than might otherwise be available. If the Company
raises additional funds by issuing equity securities, further dilution to
stockholders may result and new investors could have rights superior to existing
stockholders. The Company has no established banking arrangements through which
it can obtain debt financing. See "Use of Proceeds," "Capitalization" and
"Management's Discussion and Analysis of Financial Condition and Results of
Operations--Liquidity and Capital Resources."
 
COMPETITION AND TECHNOLOGICAL CHANGE
 
    Competition in the biopharmaceutical industry is intense. The Company faces
competition from many companies and major universities and research institutions
in the United States and abroad. Many of the Company's competitors have
substantially greater resources, experience in conducting preclinical studies
and clinical trials and obtaining regulatory approvals for their products,
operating experience, research and development and marketing capabilities and
production capabilities than those of the Company. There can be no assurance
that the Company's competitors will not develop technologies and products that
are safer or more effective than any being developed by the Company or which
would render the Company's technology and products obsolete and noncompetitive,
and the Company's competitors may succeed in obtaining FDA approval for products
more rapidly than the Company. The Company will face competition from companies
marketing existing products or developing new products for diseases targeted by
the Company's technologies. The development of new products for those diseases
for which the Company is developing products could render the Company's product
candidates noncompetitive and obsolete. There can be no assurance that the
products under development by the Company and its collaborators will be able to
compete successfully with existing products or products under development by
other companies, universities and other institutions or that they will attain
regulatory approval in the United States or elsewhere. With respect to the
Company's products for the treatment of HIV infection, two classes of products
made by competitors of the Company have been approved for marketing by the FDA
for the
 
                                       8
<PAGE>
treatment of HIV infection and AIDS: reverse transcriptase inhibitors and
protease inhibitors. Both types of drugs are inhibitors of viral enzymes and
have shown efficacy in reducing the concentration of HIV in the blood and
prolonging asymptomatic periods in HIV-positive individuals, especially when
administered in combination. However, it is not known whether HIV will develop
resistance to these drugs over time. In addition, the use of these drugs
presents problems of toxic side effects and compliance for some patients.
 
    A significant amount of research in the biopharmaceutical field is also
being carried out at academic and government institutions. The Company's
strategy is to in-license technology and product candidates from academic and
government institutions. These institutions are becoming increasingly aware of
the commercial value of their findings and are becoming more aggressive in
pursuing patent protection and negotiating licensing arrangements to collect
royalties for use of technology that they have developed. These institutions may
also market competitive commercial products on their own or in collaboration
with competitors and will compete with the Company in recruiting highly
qualified scientific personnel. Any resulting increase in the cost or decrease
in the availability of technology or product candidates from these institutions
may affect the Company's business strategy.
 
    If the Company receives regulatory approvals to commence commercial sales of
products, the Company will also be competing with respect to commercial scale
manufacturing and marketing capabilities, areas in which the Company has limited
or no experience. See "Business--Manufacturing" and "--Sales and Marketing."
 
LIMITED MANUFACTURING CAPABILITIES
 
    In order to successfully commercialize its product candidates, Progenics
must be able to manufacture its products in commercial quantities, in compliance
with regulatory requirements, at acceptable costs and in a timely manner. The
manufacture of the types of biopharmaceutical products being developed by the
Company presents several risks and difficulties. For example, the manufacture of
recombinant proteins used in certain of the Company's current HIV products in
development is complex, can be difficult to accomplish even in small quantities,
can be difficult to scale-up when large scale production is required and can be
subject to delays, inefficiencies and poor or low yields of quality products.
Although Progenics has constructed two pilot-scale manufacturing facilities
which it believes will be sufficient to meet the Company's initial needs for
clinical trials, these facilities may be insufficient for all of its late-stage
clinical trials and for its commercial-scale manufacturing requirements.
Accordingly, the Company expects to expand its manufacturing staff and
facilities and obtain new facilities or to contract with third parties to assist
with production. Manufacture of some of Progenics' initial products for
commercialization is expected to require third party contract manufacturers at a
significant cost to the Company. In employing third party manufacturers,
Progenics will not control all aspects of the manufacturing process. There can
be no assurance that the Company will be able to obtain from third party
manufacturers adequate supplies in a timely fashion for commercialization, or
that commercial quantities of any such products, if approved for marketing, will
be available from contract manufacturers at acceptable costs. In the event the
Company decides to establish a full-scale commercial manufacturing facility, the
Company will require substantial additional funds and will be required to hire
and train significant numbers of employees and comply with the extensive
regulations applicable to such a facility. There is no assurance that Progenics
will be able to develop a current Good Manufacturing Practices ("cGMP")
manufacturing facility sufficient for all clinical trials or commercial-scale
manufacturing. The cost of manufacturing certain products may make them
prohibitively expensive. In addition, in order to successfully commercialize its
product candidates, the Company may be required to reduce the cost of
production, and there can be no assurance that the Company will be able to do
so. See "Business--Manufacturing."
 
AVAILABILITY OF MATERIALS
 
    Although Progenics has not experienced any significant difficulties in
obtaining the raw materials necessary to perform its research, development and
manufacturing activities to date, there can be no
 
                                       9
<PAGE>
assurance that sufficient quantities of these materials will be available to
support continued research, development or commercial manufacture of any of the
Company's planned products. The Company currently obtains supplies of critical
materials used in production of GMK and MGV from single sources. Specifically,
commercialization of the Company's GMK and MGV cancer vaccine candidates
requires a certain adjuvant from Aquila Biopharmaceuticals Inc. ("Aquila"). The
Company has entered into a license and supply agreement with Aquila pursuant to
which Aquila agreed to supply the Company with all of its requirements for the
QS-21 adjuvant for use in certain ganglioside-based cancer vaccines, including
GMK and MGV. The agreement grants to the Company a license to use Aquila's
patented technology to develop, manufacture and sell certain cancer vaccines
using QS-21 and, if Aquila is unable to supply the Company with sufficient
quantities of QS-21, the Company has the right to manufacture QS-21 itself or
purchase it from third parties for so long as Aquila is unable to supply the
Company with sufficient quantities. There can be no assurance that Aquila will
be able to supply sufficient quantities of QS-21 to the Company. See
"Business--Manufacturing."
 
GOVERNMENT REGULATION; NO ASSURANCE OF REGULATORY APPROVAL
 
   
    The Company and its products are subject to comprehensive regulation by the
FDA in the United States and by comparable authorities in other countries. These
national agencies and other federal, state, and local entities regulate, among
other things, the preclinical and clinical testing, safety, effectiveness,
approval, manufacture, labeling, marketing, export, storage, record keeping,
advertising, and promotion of the Company's products. See "--Uncertainty
Associated with Preclinical and Clinical Testing."
    
 
    Among other requirements, FDA approval of the Company's products, including
a review of the manufacturing processes and facilities used to produce such
products, will be required before such products may be marketed in the United
States. In order to obtain FDA approval of a product, the Company must
demonstrate to the satisfaction of the FDA that such product is safe and
effective for its intended uses and that the Company is capable of manufacturing
the product with procedures that conform to the FDA's cGMP regulations, which
must be followed at all times. The process of obtaining FDA approvals can be
costly, time consuming, and subject to unanticipated delays and the Company has
had only limited experience in filing and pursuing applications necessary to
gain regulatory approvals. There can be no assurance that such approvals will be
granted on a timely basis, or at all.
 
    The Company's analysis of the results of its clinical studies is subject to
review and interpretation by the FDA, which may differ from the Company's
analysis. There can be no assurance that the Company's data or its
interpretation of data will be accepted by the FDA. In addition, delays or
rejections may be encountered based upon changes in applicable law or FDA policy
during the period of product development and FDA regulatory review. Any failure
to obtain, or delay in obtaining, FDA approvals would adversely affect the
ability of the Company to market its proposed products. Moreover, even if FDA
approval is granted, such approval may include significant limitations on
indicated uses for which a product could be marketed.
 
    Both before and after approval is obtained, a product, its manufacturer and
the holder of the New Drug Application ("NDA") or Product License Application
("PLA") for the product are subject to comprehensive regulatory oversight.
Violations of regulatory requirements at any stage, including the preclinical
and clinical testing process, the approval process, or post-approval marketing
activities may result in various adverse consequences, including the FDA's delay
in approving or refusal to approve a product, withdrawal of an approved product
from the market, and/or the imposition of criminal penalties against the
manufacturer and/or the holder of the marketing approval for the product. In
addition, later discovery of previously unknown problems relating to a marketed
product may result in restrictions on such product, manufacturer, or the holder
of the marketing approval for the product, including withdrawal of the product
from the market. Also, new government requirements may be established that could
delay or prevent regulatory approval of the Company's products under
development.
 
                                       10
<PAGE>
    The Company is also subject to numerous and varying foreign regulatory
requirements governing the design and conduct of clinical trials and the
manufacturing and marketing of its products. The approval procedure varies among
countries and can involve additional testing, and the time required to obtain
approval may differ from that required to obtain FDA approval. The foreign
regulatory approval process may include all of the risks associated with
obtaining FDA approval set forth above, and there can be no assurance that
foreign regulatory approvals will be obtained on a timely basis, if at all.
Approval by the FDA does not ensure approval by regulatory authorities in other
foreign countries. There can be no assurance that the Company or its partners
will file for regulatory approvals or receive necessary approvals to
commercialize its product candidates in any market. Delays in receipt of or
failure to receive regulatory approvals, or the loss of previously received
approvals, would have a material adverse effect on the Company's business,
financial condition and results of operations.
 
    The Company relies, in part, on academic institutions and on clinical
research organizations to conduct and monitor certain of its clinical trials.
There can be no assurance that such entities will conduct the clinical trials
successfully. In addition, certain clinical trials for the Company's products
will be conducted by government-sponsored agencies. Because the conduct of such
trials will be dependent on government participation and funding, the Company
will have less control over such trials than if the Company were the sole
sponsor. As a result, there can be no assurance that these trials will commence
or be completed as planned. See "Business--Government Regulation."
 
DEPENDENCE ON THIRD PARTIES
 
    The Company relies heavily on third parties for a variety of functions,
including certain functions relating to research and development, manufacturing,
clinical trials management and regulatory affairs. As of September 30, 1996, the
Company had only 27 full-time employees. The Company is party to several
collaborative research agreements which place substantial responsibility on the
Company's partners for clinical development of products. The Company also
in-licenses technology from medical and academic institutions in order to
minimize investments in early research and enters into collaboration
arrangements with certain of these entities with respect to clinical trials of
product candidates.
 
    To date, the Company has derived most of its revenues from federal research
grants. The government's obligation to make payments under these grants is
subject to appropriation by the United States Congress for funding in each year.
Moreover, it is possible that Congress or the government agencies that
administer these government research programs will determine to scale back these
programs or terminate them or that the government will award future grants to
competitors of the Company instead of the Company. In addition, there can be no
assurances that the Company will be awarded any such grants in the future or
that any amounts derived therefrom will not be less than those received to date.
Certain of the Company's clinical trials will be partially paid for by
government funds. Any future reduction in the funding the Company receives
either from federal research grants or with respect to clinical trials could
adversely affect the Company's business, financial condition and results of
operations.
 
    Progenics' business strategy includes entering into strategic alliances or
licensing arrangements with corporate partners, primarily pharmaceutical and
biotechnology companies, relating to the development and commercialization of
certain of its potential products. There can be no assurance that such
collaborations will be available to the Company on acceptable terms, if at all,
or that any such relationships, if established, will be scientifically or
commercially successful. The Company expects that under certain of these
arrangements, the collaborative partner will have the responsibility for
conducting human clinical trials and the submission for regulatory approval of
the product candidate with the FDA and certain other regulatory agencies. Should
the collaborative partner fail to develop a marketable product, the Company's
business may be materially adversely affected.
 
    There can be no assurance that Progenics will be able to establish and
maintain any of the corporate, academic or government relationships described
above on terms acceptable to the Company, that the
 
                                       11
<PAGE>
Company can enter into these arrangements without undue delays or expenditures,
or that these arrangements will allow the Company to compete successfully
against other companies.
 
LACK OF SALES AND MARKETING EXPERIENCE
 
    If FDA and other approvals are obtained with respect to any of its products,
Progenics expects to market and sell its products through co-marketing,
co-promotion or other licensing arrangements with third parties. Progenics has
no experience in sales, marketing or distribution and its current management and
staff are not trained in these areas. To the extent that the Company enters into
co-marketing, co-promotion or other licensing arrangements for the marketing and
sale of its products, any revenues received by the Company will be dependent on
the efforts of third parties. The Company would not control the amount and
timing of resources such third parties would devote to the Company's products.
If any of such parties were to breach or terminate its agreement with the
Company or otherwise fail to conduct its collaborative activities successfully
and in a timely manner, the commercialization of product candidates would be
delayed or terminated. Any such delay or termination could have a material
adverse effect on the Company's business, financial condition and results of
operations. In addition, if the Company markets products directly, significant
additional expenditures and management resources would be required to develop an
internal sales force. There can be no assurance that the Company will be able to
establish a successful sales force. See "Business--Business Strategy."
 
DEPENDENCE ON AND UNCERTAINTY OF PROTECTION OF PATENTS AND PROPRIETARY RIGHTS
 
   
    Progenics' policy is to protect its proprietary technology, and the Company
considers the protection of such rights to be important to its business. In this
regard, under a license agreement with Sloan-Kettering, the Company has obtained
worldwide, exclusive rights to certain technology relating to ganglioside
conjugate vaccines, including GMK and MGV, and their use to treat or prevent
cancer. In addition, the Company has licensed from Columbia University
worldwide, exclusive rights to certain technology relating to CD4 and its use to
treat or prevent HIV infection including patents and patent applications.
Progenics has also filed a number of U.S. and foreign patent applications on its
UnAB, ProSys and ProVax technologies and uses of these technologies. The Company
is required to make substantial cash payments and achieve certain milestones and
requirements, including, without limitation, filing INDs, obtaining product
approvals and introducing products, to maintain its rights under these licenses.
In the past, the Company did not achieve a milestone under the Columbia
University agreement and the Company and Columbia agreed to a modification of
the agreement. There is no assurance that the Company will be able to make
required cash payments when due or achieve the milestones and requirements in
order to maintain its rights under these licenses. Termination of any of such
licenses could result in the Company being unable to continue development of its
product candidates and production and marketing of approved products, if any.
Consequently, termination of the licenses could have a material adverse effect
on the business, financial condition and results of operations of the Company.
    
 
    There can be no assurance that patent applications owned by or licensed to
the Company will result in patents being issued or that, if issued, the patents
will afford protection against competitors with similar technology. Although a
patent has a statutory presumption of validity in the United States, the
issuance of a patent is not conclusive as to such validity or as to the
enforceable scope of the claims of the patent. There can be no assurance that
the Company's issued patents or any patents subsequently issued to or licensed
by the Company will not be successfully challenged in the future. The validity
or enforceability of a patent after its issuance by the patent office can be
challenged in litigation. The cost of litigation to uphold the validity of
patents and to prevent infringement can be substantial. If the outcome of the
litigation is adverse to the owner of the patent, third parties may then be able
to use the invention covered by the patent without payment. There can be no
assurance that the Company's patents will not be infringed or successfully
avoided through design innovation.
 
                                       12
<PAGE>
    The Company may not retain all rights to developments, inventions, patents
and other proprietary information resulting from its collaborative arrangements,
whether in effect as of the date hereof or which may be entered into at some
future time with third parties. As a result, the Company may be required to
license such developments, inventions, patents or other proprietary information
from such third parties, possibly at significant cost to the Company. The
Company's failure to obtain any such licenses could have a material adverse
effect on the business, financial condition and results of operations of the
Company.
 
    There may be patent applications and issued patents belonging to competitors
that may require the Company to alter its products, pay licensing fees or cease
certain activities. If the Company's products conflict with patents that have
been or may be granted to competitors, universities or others, such other
persons could bring legal actions against the Company claiming damages and
seeking to enjoin manufacturing and marketing of the affected products. If any
such actions are successful, in addition to any potential liability for damages,
the Company could be required to obtain a license in order to continue to
manufacture or market the affected products. There can be no assurance that the
Company would prevail in any such action or that any license required under any
such patent would be made available on acceptable terms or at all. There is
significant litigation in the industry regarding patent and other intellectual
property rights. If the Company becomes involved in such litigation, it could
consume substantial resources.
 
    Progenics has also filed a number of U.S. and foreign patent applications
(one of which is owned jointly with ADARC) relating to the discovery of a second
HIV receptor, CKR-5. In addition to the risks described above, the Company is
aware that other groups have claimed discoveries similar to that covered by the
Company's patent applications. These groups may have made their discoveries
prior to the discoveries covered by the Company's patent applications and may
have filed their applications prior to the Company's patent applications. The
Company does not expect to know for several years the relative strength of its
patent position as compared to these other groups.
 
    In addition to the patents, patent applications, licenses and intellectual
property processes described above, the Company also relies on unpatented
technology, trade secrets and information. No assurance can be given that others
will not independently develop substantially equivalent information and
techniques or otherwise gain access to the Company's technology or disclose such
technology, or that the Company can meaningfully protect its rights in such
unpatented technology, trade secrets and information. The Company requires each
of its employees, consultants and advisors to execute a confidentiality
agreement at the commencement of an employment or consulting relationship with
the Company. The agreements generally provide that all inventions conceived by
the individual in the course of employment or in providing services to the
Company and all confidential information developed by, or made known to, the
individual during the term of the relationship shall be the exclusive property
of the Company and shall be kept confidential and not disclosed to third parties
except in limited specified circumstances. There can be no assurance, however,
that these agreements will provide meaningful protection for the Company's
information in the event of unauthorized use or disclosure of such confidential
information. See "Business--Patents and Proprietary Technology."
 
DEPENDENCE UPON KEY PERSONNEL
 
    Progenics is dependent upon certain key management and scientific personnel.
In particular, the loss of Dr. Maddon could have a materially adverse effect on
Progenics, unless a qualified replacement could be found. Progenics maintains a
key-man life insurance policy on Dr. Maddon in the amount of $2.5 million. The
Company's employment agreement with Dr. Maddon expires in 1998, and there can be
no assurance that it will be renewed by the parties thereto. See
"Management--Executive Compensation."
 
                                       13
<PAGE>
ATTRACTION AND RETENTION OF PERSONNEL
 
    Competition for qualified employees among companies in the biopharmaceutical
industry is intense. Progenics' future success depends upon its ability to
attract, retain and motivate highly skilled employees. Although Progenics has
established relationships with the scientists who serve on its Scientific
Advisory Boards, these individuals do not devote a substantial portion of their
time to Progenics-related activities and do not participate directly in the
development of Progenics' products on a daily basis. Attracting desirable
employees will require Progenics to offer competitive compensation packages,
including stock options. In order to successfully commercialize its products,
the Company must substantially expand its personnel, particularly in the areas
of manufacturing, clinical trials management, regulatory affairs, business
development and marketing. There can be no assurance that the Company will be
successful in hiring or retaining qualified personnel. Managing the integration
of new personnel and Company growth generally could pose significant risks to
the Company's development and progress. The addition of such personnel may
result in significant changes in the Company's utilization of cash resources and
its development schedule. See "Business--Human Resources."
 
UNCERTAINTY RELATED TO HEALTH CARE REFORM MEASURES AND REIMBURSEMENT
 
    In recent years, there have been numerous proposals to change the health
care system in the United States. Some of these proposals have included measures
that would limit or eliminate payments for certain medical procedures and
treatments or subject the pricing of pharmaceuticals to government control.
Significant changes in the health care system in the United States or elsewhere
might have a substantial impact on the manner in which the Company conducts its
business. Such changes also could have a material adverse effect on the
Company's ability to raise capital. Furthermore, the Company's ability to
commercialize products may be adversely affected to the extent that such
proposals have a material adverse effect on the business, financial condition
and profitability of other companies that are collaborators or prospective
collaborators of the Company.
 
    In addition, significant uncertainty exists as to the reimbursement status
of newly-approved health care products. The Company's and its collaborators'
success in generating revenue from sales of products may depend, in part, on the
extent to which reimbursement for the costs of such products will be available
from third-party payors, such as government health administration authorities,
private health insurers and health maintenance organizations ("HMOs"). In
addition, the trend towards managed health care in the United States and the
concurrent growth of organizations such as HMOs, which could control or
significantly influence the purchase of health care services and products, as
well as legislative proposals to reduce government insurance programs, may all
result in lower prices for products and could affect the market for products. If
the Company succeeds in bringing one or more products to market, there can be no
assurance that such products will be considered cost-effective or that adequate
third-party insurance coverage will be available for the Company to establish
and maintain price levels sufficient for realization of an appropriate return on
its investment in product development. Third-party payors are increasingly
attempting to contain health care costs by limiting both coverage and the level
of reimbursement of new products approved for marketing by the FDA. If adequate
coverage and reimbursement levels are not provided by government and third-party
payors for uses of the Company's products, the market acceptance of such
products would be adversely affected.
 
RISK OF PRODUCT LIABILITY; LIMITED AVAILABILITY OF INSURANCE
 
    The Company's business exposes it to potential product liability risks which
are inherent in the testing, manufacturing, marketing and sale of human vaccine
and therapeutic products, and there can be no assurance that the Company will be
able to avoid significant product liability exposure. Product liability
insurance for the biopharmaceutical industry in generally expensive, if
available at all. The Company has obtained product liability insurance coverage
in the amount of $5 million per occurrence, subject to a $5 million aggregate
limitation. However, there can be no assurance that the Company's present
insurance
 
                                       14
<PAGE>
coverage is now or will continue to be adequate as the Company further develops
products. In addition, certain of the Company's license and collaborative
agreements require the Company to obtain product liability insurance and it is
possible that license and collaborative agreements which the Company may enter
into in the future may also include such a requirement. There can be no
assurance that in the future adequate insurance coverage will be available in
sufficient amounts or at a reasonable cost, or that a product liability claim or
recall would not have a material adverse effect on the Company.
 
HAZARDOUS MATERIALS; ENVIRONMENTAL MATTERS
 
    The Company's research and development work and manufacturing processes
involve the use of hazardous, controlled and radioactive materials. The Company
is subject to federal, state and local laws and regulations governing the use,
manufacture, storage, handling and disposal of such materials and certain waste
products. Although the Company maintains safety procedures for handling and
disposing of such materials that it believes comply with the standards
prescribed by such 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 could be held liable for any damages that result
and any such liability could exceed the resources of the Company. Although the
Company believes that it is in compliance in all material respects with
applicable environmental laws and regulations, there can be no assurance that
the Company will not be required to incur significant costs to comply with
environmental laws and regulations in the future, or that the operations,
business or assets of the Company will not be materially or adversely affected
by current or future environmental laws or regulations.
 
    The research and development efforts sponsored by the Company involve
laboratory animals. The Company may be adversely affected by changes in laws,
regulations or accepted clinical procedures or by social pressures that would
restrict the use of animals in testing or by actions against the Company or its
collaborators by groups or individuals opposed to such testing.
 
ABSENCE OF PRIOR TRADING MARKET; POSSIBLE VOLATILITY OF STOCK PRICE
 
    Prior to this offering, there has been no public market for the Common
Stock, and there is no assurance that an active market will develop or be
sustained after this offering or that the market price of the Common Stock will
not decline below the initial public offering price. The initial public offering
price will be determined by negotiation between the Company and the
representatives of the Underwriters and may bear no relationship to the price at
which the Common Stock will trade after completion of this offering. See
"Underwriting" for factors to be considered in determining such offering price.
The market price of the shares of Common Stock, like that of the common stock of
many other biopharmaceutical companies, is likely to be highly volatile. Factors
such as the results of preclinical studies and clinical trials by the Company or
its competitors, other evidence of the safety or efficacy of products of the
Company or its competitors, announcements of technological innovations or new
commercial products by the Company or its competitors, governmental regulation,
changes in reimbursement policies, health care legislation, developments in
patent or other proprietary rights, developments in the Company's relationships
with existing and future collaborative partners, if any, public concern as to
the safety and efficacy of products developed by the Company, fluctuations in
the Company's operating results, and general market conditions may have a
significant impact on the market price of the Common Stock.
 
CONTROL BY EXISTING STOCKHOLDERS; ANTI-TAKEOVER PROVISIONS
 
    Upon the completion of this offering, certain current stockholders of the
Company, including Dr. Maddon and stockholders affiliated with Tudor Investment
Corporation and Weiss, Peck & Greer, will beneficially own or control a
substantial portion of the outstanding shares of Common Stock and therefore may
have the ability, acting together, to elect all of the Company's directors, to
determine the outcome of most corporate actions requiring stockholder approval
and otherwise control the business of the Company. Such control could have the
effect of delaying or preventing a change in control of the Company and
 
                                       15
<PAGE>
consequently adversely affect the market price of the Common Stock. In addition,
the Company's Board of Directors is authorized to issue from time to time shares
of Preferred Stock, without stockholder authorization, in one or more designated
series or classes. The issuance of Preferred Stock, as well as certain
provisions in certain of the Company's stock options which provide for
acceleration of exercisability upon a change of control of the Company and
certain provisions of the Delaware General Corporation Law (Section 203, in
particular), could make the possible takeover of the Company or the removal of
the Company's management more difficult, discourage hostile bids for control of
the Company in which stockholders may receive a premium for their shares of
Common Stock or otherwise dilute the rights of holders of Common Stock and
depress the market price of the Common Stock. See "Principal Stockholders" and
"Description of Capital Stock."
 
FUTURE SALES OF COMMON STOCK; REGISTRATION RIGHTS; POSSIBLE ADVERSE EFFECT ON
  FUTURE MARKET PRICE
 
   
    A substantial number of outstanding shares of Common Stock and shares of
Common Stock issuable upon exercise of outstanding options and warrants will
become eligible for future sale in the public market at prescribed times. Sales
of substantial numbers of shares of Common Stock in the public market following
this offering could adversely affect prevailing market prices. The Securities
and Exchange Commission (the "Commission") has proposed an amendment to Rule 144
under the Securities Act of 1933, as amended (the "Securities Act"), that if
adopted, would permit certain shares to be sold one year earlier than otherwise
provided by the current version of Rule 144. Commencing one year after the date
of this Prospectus, each stockholder who purchased shares of the Company's stock
prior to this offering (which stockholders hold, as of September 30, 1996,
6,554,553 shares of Common Stock and have the right to acquire 260,455 shares of
Common Stock upon the exercise of outstanding warrants) is entitled to certain
rights with respect to the registration of such shares of Common Stock for offer
or sale to the public. The Company plans to file a Form S-8 registration
statement registering shares issuable pursuant to the Company's stock option
plans. Any sales by existing shareholders or holders of options or warrants may
have an adverse effect on the Company's ability to raise needed capital and may
adversely affect the market price of the Common Stock. See "Description of
Capital Stock," "Shares Eligible for Future Sale" and "Underwriting."
    
 
DILUTION
 
    The initial public offering price will be substantially higher than the net
tangible book value per share of the Company which, at September 30, 1996, was
$0.25 per share. Investors purchasing shares of Common Stock in this offering
will suffer immediate, substantial net tangible book value dilution of $9.28 per
share, assuming an initial public offering price of $12.00 per share. In
addition, this dilution will be increased to the extent that holders of
outstanding options and warrants to purchase Common Stock at prices below the
net tangible book value per share of the Company after this offering exercise
such options or warrants. See "Dilution."
 
ABSENCE OF DIVIDENDS
 
    The Company has never paid any cash dividends on its Common Stock and does
not anticipate paying cash dividends in the foreseeable future. The Company
currently intends to retain earnings, if any, for the development of its
business. In addition, the Company has entered into certain capitalized leases
that contain covenants which indirectly restrict the Company's ability to pay
dividends. See "Dividend Policy."
 
                                       16
<PAGE>
                                USE OF PROCEEDS
 
    The net proceeds to the Company from the sale of the 2,000,000 shares of
Common Stock offered hereby, at an assumed initial public offering price of
$12.00 per share and after deducting the underwriting discount and estimated
expenses payable by the Company, are estimated to be approximately $21,570,000
($24,918,000 if the Underwriters' over-allotment option is exercised in full).
The Company intends to use the net proceeds to fund clinical trials of its
leading product candidates, research and development, in-licensing of late-stage
technology and for working capital and general corporate purposes.
 
   
    The Company believes that the net proceeds of this offering, together with
the Company's present capital resources, should be sufficient to fund operations
through the end of 1998 based on the Company's current operating plan. No
assurance can be given that there will be no change that would consume the
Company's liquid assets before such time. Thereafter, the Company will require
substantial funds in addition to the proceeds of this offering to conduct
development activities, preclinical studies, clinical trials and other
activities relating to the commercialization of any potential products. The
Company anticipates that these funds will be obtained from external sources,
such as future offerings of equity or debt securities or agreements with
corporate partners and collaborators with respect to the development of the
Company's technology, and intends to seek additional financing to fund future
operations. There can be no assurance, however, that the Company will be able to
negotiate such arrangements or obtain the additional funds it will require on
acceptable terms, if at all.
    
 
    In addition, the Company's cash requirements may vary materially from those
now planned because of results of research and development and product testing,
potential relationships with in-licensors and collaborators, changes in the
focus and direction of the Company's research and development programs,
competitive and technological advances, the cost of filing, prosecuting,
defending and enforcing patent claims, the regulatory approval process,
manufacturing, marketing and other costs associated with commercialization of
products following receipt of regulatory approvals and other factors. The
Company's lease for all of its facilities expires in April 1998. If the Company
elects to move to a new location, it may incur substantial expenses for
leasehold improvements and relocation costs. If the Company renews its current
lease, certain costs will be incurred to enhance its manufacturing capabilities.
 
    Pending such uses, the net proceeds from this offering will be temporarily
invested by the Company in short-term, interest bearing investment grade
securities.
 
                                DIVIDEND POLICY
 
   
    The Company has not paid any dividends since its inception and presently
anticipates that all earnings, if any, will be retained for development of the
Company's business and that no dividends on its Common Stock will be declared in
the foreseeable future. In addition, under the terms of certain equipment lease
financing agreements, the Company is required to maintain a minimum level of
tangible net worth of $625,000 and consequently would be prohibited from paying
dividends which would reduce tangible net worth below such amount.
    
 
                                       17
<PAGE>
                                 CAPITALIZATION
 
   
    The following table sets forth the actual, the pro forma and the pro forma
as adjusted capitalization of the Company at September 30, 1996 as described
below. This table should be read in conjunction with the Company's Financial
Statements and related Notes included elsewhere in this Prospectus.
    
   
<TABLE>
<CAPTION>
                                                                                    SEPTEMBER 30, 1996
                                                                         -----------------------------------------
<S>                                                                      <C>         <C>            <C>
                                                                                                      PRO FORMA
                                                                           ACTUAL    PRO FORMA(1)   AS ADJUSTED(2)
                                                                         ----------  -------------  --------------
 
<CAPTION>
                                                                                      (IN THOUSANDS)
<S>                                                                      <C>         <C>            <C>
Long-term portion of capital lease obligations.........................  $      155   $       155    $        155
                                                                         ----------  -------------  --------------
Stockholders' equity:
Preferred Stock, $.001 par value; 20,000,000 shares authorized:
  Series A Preferred Stock; 4,000,000 shares designated; 2,308,000
    shares issued and outstanding, actual; and no shares issued and
    outstanding, pro forma and pro forma as adjusted...................           2            --              --
  Series B Preferred Stock; 2,500,000 shares designated; 1,982,830
    shares issued and outstanding, actual; and no shares issued and
    outstanding, pro forma and pro forma as adjusted...................           2            --              --
  Series C Preferred Stock; 3,750,000 shares designated; 1,388,996
    shares issued and outstanding, actual; and no shares issued and
    outstanding, pro forma and pro forma as adjusted...................           1            --              --
Common Stock, $.0013 par value, 40,000,000 shares authorized, 2,294,675
  shares issued and outstanding, actual; 6,554,553 shares issued and
  outstanding, pro forma; and 8,554,553 shares issued and outstanding,
  pro forma as adjusted(3).............................................           3             8              11
Additional paid-in capital.............................................      22,799        22,799          44,366
Deficit accumulated during the development stage.......................     (21,139)      (21,139)        (21,139)
                                                                         ----------  -------------  --------------
  Total stockholders' equity...........................................       1,668         1,668          23,238
                                                                         ----------  -------------  --------------
    Total capitalization...............................................  $    1,823   $     1,823    $     23,393
                                                                         ----------  -------------  --------------
                                                                         ----------  -------------  --------------
</TABLE>
    
 
- ------------------------
 
   
(1) Assumes the conversion of all outstanding shares of the Company's Preferred
    Stock into an aggregate of 4,259,878 shares of Common Stock pursuant to
    their terms. See "Description of Capital Stock."
    
 
   
(2) Assumes (i) the sale of 2,000,000 shares of Common Stock offered hereby at
    an assumed initial public offering price of $12.00 per share and the receipt
    of the net proceeds therefrom after deducting the underwriting discount and
    estimated offering expenses and (ii) conversion of all outstanding shares of
    the Company's Preferred Stock into an aggregate of 4,259,878 shares of
    Common Stock pursuant to their terms. See "Use of Proceeds" and "Description
    of Capital Stock."
    
 
   
(3) Excludes as of September 30, 1996: (i) 1,791,236 shares subject to
    outstanding options at a weighted average exercise price of $4.86 per share,
    of which options to purchase 686,552 shares at a weighted average exercise
    price of $4.16 per share were exercisable; (ii) 260,455 shares of Common
    Stock reserved for issuance upon the exercise of outstanding warrants at an
    exercise price of $6.67 per share, all of which were exercisable; (iii)
    62,775 shares subject to options to be granted prior to the completion of
    this offering at an exercise price equal to the initial public offering
    price; and, (iv) 750,000 shares available for future issuance under the
    Company's stock option plans.
    
 
                                       18
<PAGE>
                                    DILUTION
 
    The net tangible book value of the Company as of September 30, 1996 was
$1,668,000 or $0.25 per share. Net tangible book value per share is determined
by dividing the net tangible book value of the Company (total tangible assets
less total liabilities) by the number of shares of Common Stock outstanding (on
a pro forma basis to give effect to the conversion of all outstanding shares of
Preferred Stock). Without taking into account any changes in the net tangible
book value after September 30, 1996, other than to give effect to the sale of
the 2,000,000 shares of Common Stock offered hereby (at an assumed initial
public offering price of $12.00 per share) and the application of the net
proceeds therefrom, the pro forma net tangible book value of the Company at
September 30, 1996 would have been $23,238,000, or $2.72 per share. This
represents an immediate increase in net tangible book value of $2.47 per share
to existing stockholders and an immediate dilution in net tangible book value of
$9.28 per share to new investors. The following table illustrates this per share
dilution:
 
<TABLE>
<S>                                                            <C>        <C>
Assumed initial public offering price per share..............             $   12.00
  Net tangible book value per share before offering..........  $    0.25
  Increase in net tangible book value per share attributable
    to
    new investors............................................       2.47
                                                               ---------
Pro forma net tangible book value per share after offering...                  2.72
                                                                          ---------
Dilution per share to new investors..........................             $    9.28
                                                                          ---------
                                                                          ---------
</TABLE>
 
    The following table sets forth, on the pro forma basis described above, as
of September 30, 1996 the number and percentage of shares of Common Stock
purchased from the Company, the total cash consideration (with respect to the
new investors, at an assumed initial public offering price of $12.00 per share),
and percentage of total cash consideration paid to the Company and the average
price per share paid by existing stockholders and new investors:
 
<TABLE>
<CAPTION>
                                                                             TOTAL CASH CONSIDERATION
                                                      SHARES PURCHASED
                                                   -----------------------  --------------------------  AVERAGE PRICE
                                                     NUMBER      PERCENT       AMOUNT        PERCENT      PER SHARE
                                                   ----------  -----------  -------------  -----------  -------------
<S>                                                <C>         <C>          <C>            <C>          <C>
Existing stockholders............................   6,554,553        76.6%  $  22,781,000        48.7%    $    3.48
New investors....................................   2,000,000        23.4      24,000,000        51.3         12.00
                                                   ----------       -----   -------------       -----
      Total......................................   8,554,553       100.0%  $  46,781,000       100.0%
                                                   ----------       -----   -------------       -----
                                                   ----------       -----   -------------       -----
</TABLE>
 
    The foregoing tables do not assume the exercise of outstanding options or
warrants. At September 30, 1996, there were outstanding options to purchase
1,791,236 shares of Common Stock under the Company's stock option plans at a
weighted average exercise price of $4.86 per share, and outstanding warrants to
purchase 260,455 shares of Common Stock at a price of $6.67 per share. The
exercise of such options and warrants would result in further dilution to new
investors. In addition, (i) effective prior to the completion of this offering,
the Company plans to grant options to purchase 62,775 shares to employees having
an exercise price equal to the initial public offering price in this offering
and (ii) following the completion of this offering, there will be 750,000 shares
of Common Stock reserved for future issuance under the Company's stock option
plans. See "Capitalization," "Management--Stock Option Plans" and "Description
of Capital Stock."
 
                                       19
<PAGE>
                            SELECTED FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
    The selected financial data presented below with respect to the balance
sheet data as of December 31, 1994 and 1995 and September 30, 1996 and with
respect to the statement of operations data for each of the three years in the
period ended December 31, 1995, for the nine months ended September 30, 1996 and
for the period from December 1, 1986 (inception) to September 30, 1996 are
derived from the Company's financial statements, included elsewhere in this
Prospectus, which have been audited by Coopers & Lybrand L.L.P. The selected
financial data presented below with respect to the balance sheet data as of
December 31, 1991, 1992 and 1993 and with respect to the statement of operations
data for each of the years ended December 31, 1992, and November 30, 1991 and
the one month ended December 31, 1991 are derived from the Company's audited
financial statements, not included in this Prospectus. The selected financial
data presented below with respect to the statement of operations data for the
nine months ended September 30, 1995 have been derived from the Company's
unaudited financial statements included elsewhere in this Prospectus. Operating
results for the nine months ended September 30, 1996 are not necessarily
indicative of results that may be expected for the entire year ending December
31, 1996. The data set forth below 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 included elsewhere in
this Prospectus.
<TABLE>
<CAPTION>
                                                                                                        NINE MONTHS ENDED
                                 YEAR         ONE MONTH
                                 ENDED          ENDED               YEARS ENDED DECEMBER 31,              SEPTEMBER 30,
                             NOVEMBER 30,   DECEMBER 31,   ------------------------------------------  --------------------
                                 1991          1991(1)       1992       1993       1994       1995       1995       1996
                             -------------  -------------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                          <C>            <C>            <C>        <C>        <C>        <C>        <C>        <C>
STATEMENT OF OPERATIONS
  DATA:
Revenues:
  Research grants..........    $      55      $       8    $      67  $      84  $     504  $     725  $     502  $     268
  Product sales............           77             --           38         50         52         50         40         67
  Interest income..........           86              7           32         53        108         46         44         91
                             -------------  -------------  ---------  ---------  ---------  ---------  ---------  ---------
    Total revenues.........          218             15          137        187        664        821        586        426
                             -------------  -------------  ---------  ---------  ---------  ---------  ---------  ---------
Expenses:
  Research and
    development............          957             53        1,207      1,547      2,859      3,853      2,585      2,654
  General and
    administrative.........          665             45          942        748        878      1,094        790        984
  Interest expense.........           62              4           59         38         50         87         53         40
  Depreciation and
    amortization...........          207              9          151        249        289        291        229        230
                             -------------  -------------  ---------  ---------  ---------  ---------  ---------  ---------
    Total expenses.........        1,891            111        2,359      2,582      4,076      5,325      3,657      3,908
                             -------------  -------------  ---------  ---------  ---------  ---------  ---------  ---------
Net loss...................    $  (1,673)     $     (96)   $  (2,222) $  (2,395) $  (3,412) $  (4,504) $  (3,071) $  (3,482)
                             -------------  -------------  ---------  ---------  ---------  ---------  ---------  ---------
                             -------------  -------------  ---------  ---------  ---------  ---------  ---------  ---------
Pro forma net loss per
  common share(2)..........                                                                 $   (0.73)            $   (0.57)
                                                                                            ---------             ---------
                                                                                            ---------             ---------
Pro forma weighted average
  common shares
  outstanding(2)...........                                                                     6,135                 6,135
 
<CAPTION>
                              DECEMBER 1,
                                 1986
                              (INCEPTION)
                                  TO
                             SEPTEMBER 30,
                                 1996
                             -------------
<S>                          <C>
STATEMENT OF OPERATIONS
  DATA:
Revenues:
  Research grants..........    $   1,735
  Product sales............          358
  Interest income..........          633
                             -------------
    Total revenues.........        2,726
                             -------------
Expenses:
  Research and
    development............       15,505
  General and
    administrative.........        6,257
  Interest expense.........          440
  Depreciation and
    amortization...........        1,663
                             -------------
    Total expenses.........       23,865
                             -------------
Net loss...................    $ (21,139)
                             -------------
                             -------------
Pro forma net loss per
  common share(2)..........
Pro forma weighted average
  common shares
  outstanding(2)...........
</TABLE>
<TABLE>
<CAPTION>
                                                                                        DECEMBER 31,
                                                                    -----------------------------------------------------
                                                                      1991       1992       1993       1994       1995
                                                                    ---------  ---------  ---------  ---------  ---------
<S>                                                                 <C>        <C>        <C>        <C>        <C>
BALANCE SHEET DATA:
  Cash and cash equivalents.......................................  $   1,640  $   1,351  $   2,137  $   2,275  $     559
  Working capital.................................................      1,412        837      1,882      2,019         19
  Total assets....................................................      2,366      1,976      2,858      3,489      1,736
  Capital lease obligations and deferred lease liability,
    long-term portion.............................................        250        105         75        235        213
  Total stockholders' equity......................................      1,864      1,547      2,523      2,827        852
 
<CAPTION>
 
                                                                     SEPTEMBER 30,
                                                                         1996
                                                                    ---------------
<S>                                                                 <C>
BALANCE SHEET DATA:
  Cash and cash equivalents.......................................     $   1,746
  Working capital.................................................           894
  Total assets....................................................         2,841
  Capital lease obligations and deferred lease liability,
    long-term portion.............................................           181
  Total stockholders' equity......................................         1,668
</TABLE>
 
- ------------------------
 
(1) Effective January 1, 1992, the Company changed its fiscal year end from
    November 30 to December 31.
 
(2) See Note 2 to the Company's Financial Statements for information concerning
    computation of the pro forma per share data.
 
                                       20
<PAGE>
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
OVERVIEW
 
   
    Progenics is a biopharmaceutical company focusing on the development and
commercialization of innovative products for the treatment and prevention of
cancer and viral diseases. The Company commenced principal operations in late
1988 and since that time has been engaged primarily in research and development
efforts, development of its manufacturing capabilities and organizational
efforts, including recruitment of scientific and management personnel and
raising capital. In order to commercialize the principal products that the
Company has under development, the Company will need to address a number of
technological challenges and comply with comprehensive regulatory requirements.
Accordingly, it is not possible to predict the amount of funds that will be
required or the length of time that will pass before the Company receives
revenues from sales of any of its products. To date, product sales have
consisted solely of limited revenues from the sale of research reagents. The
Company expects that sales of research reagents in the future will not
significantly increase over current levels. The Company's other sources of
revenues to date have been research grants related to the Company's HIV programs
and interest income.
    
 
    To date, substantially all of the Company's expenditures have been for
research and development activities. The Company expects that its research and
development expenses will be significantly higher during the balance of 1996 and
in future years as its principal research and development programs progress and
the Company makes filings for related regulatory approvals. The Company has
incurred losses since its inception and had an accumulated deficit of
$21,139,000 at September 30, 1996. The Company has financed its operations
primarily through the private sale and issuance of equity securities. The
Company will require additional funds to complete the development of its
products, to fund the cost of clinical trials, and to fund operating losses
which are expected to continue for the foreseeable future. The Company does not
expect its products under development to be commercialized for the next several
years.
 
RESULTS OF OPERATIONS
 
NINE MONTHS ENDED SEPTEMBER 30, 1995 AND 1996
 
   
    Revenues from research grants decreased from $502,000 for the nine months
ended September 30, 1995 to $268,000 for the nine months ended September 30,
1996. The decrease resulted from a fewer number of grants in the nine months
ended September 30, 1996. Sales of research reagents increased from $40,000 for
the nine months ended September 30, 1995 to $67,000 for the nine months ended
September 30, 1996 resulting from increased orders for such reagents during the
first three quarters of 1996. Interest income increased from $44,000 for the
nine months ended September 30, 1995 to $91,000 for the nine months ended
September 30, 1996 primarily due to the investment of $5,675,000 in net proceeds
received from the Company's sale of preferred stock and warrants in the fourth
quarter of 1995 and the first quarter of 1996.
    
 
    Research and development expenses increased from $2,585,000 for the nine
months ended September 30, 1995 to $2,654,000 for the nine months ended
September 30, 1996. The increase was principally due to additional costs of
manufacturing GMK in 1996 for the Company's Phase III clinical trials, partially
offset by reductions in scientific staff in the Company's HIV department and by
a decrease in consulting expenses relating to procedures for manufacturing GMK.
 
    General and administrative expenses increased from $790,000 for the nine
months ended September 30, 1995 to $984,000 for the nine months ended September
30, 1996. The increase was principally due to an increase in payroll and related
costs to support the Company's growth. Interest expense incurred on the
Company's capital lease obligations decreased from $53,000 for the nine months
ended September 30, 1995 to $40,000 for the nine months ended September 30,
1996. Depreciation and amortization remained
 
                                       21
<PAGE>
relatively unchanged from $229,000 for the nine months ended September 30, 1995
to $230,000 for the nine months ended September 30, 1996.
 
    The Company's net loss for the nine months ended September 30, 1995 was
$3,071,000 compared to a net loss of $3,482,000 for the nine months ended
September 30, 1996.
 
YEARS ENDED DECEMBER 31, 1994 AND 1995
 
   
    Revenues from research grants increased from $504,000 in 1994 to $725,000 in
1995. The increase for 1995 resulted from a greater number of grants in that
year. Sales of research reagents remained relatively unchanged from $52,000 in
1994 to $50,000 in 1995. Interest income decreased from $108,000 in 1994 to
$46,000 in 1995 due to the reduction of cash available for investing as the
Company continued to fund its operations.
    
 
   
    Research and development expenses increased from $2,859,000 for 1994 to
$3,853,000 for 1995. The increase in 1995 primarily resulted from the Company's
preparation for clinical trials for GMK, including outside consulting expenses.
The Company hired a new Vice President of Medical Affairs in October 1994 and,
during 1995, hired a Manager of Clinical Trials and other related staff. In
addition, the Company incurred expenses in 1995 related to a new license and
supply agreement with Aquila. Rent expense also increased by $115,000 in 1995
resulting from occupation of the Company's expanded laboratory space for the
full fiscal year; the expanded space was occupied at the end of the second
quarter of 1994. These increases were partially offset by a reduction in
scientific staff in the Company's HIV department during the second half of 1995.
    
 
   
    General and administrative expenses increased from $878,000 in 1994 to
$1,094,000 for 1995. The increase in 1995 was principally due to additional
legal fees of $120,000 relating to in-licensing activities, filing new patent
applications and personnel expenses, additional rent expense of $35,000
resulting from the expansion of the Company's office space at the end of the
second quarter of 1994, and increased insurance costs related, in part, to
coverage for the Company's clinical trials. Interest expense increased from
$50,000 in 1994 to $87,000 in 1995 due, in part, to the financing of additional
equipment under capitalized leases during 1994 and 1995. The Company also
recognized interest expense of $24,000 on amounts advanced to the Company during
1995 in the aggregate principal amount of $1,200,000. Depreciation and
amortization remained relatively unchanged from $289,000 in 1994 to $291,000 in
1995.
    
 
    The Company's net loss in 1994 was $3,412,000 compared to a net loss of
$4,504,000 in 1995.
 
YEARS ENDED DECEMBER 31, 1993 AND 1994
 
    Revenues from research grants increased from $84,000 in 1993 to $504,000 in
1994, primarily due to an increase in the number of research grants from which
the Company earned grant revenue in 1994. Interest income increased from $53,000
in 1993 to $108,000 in 1994, primarily due to the investment of $3,597,000 in
net proceeds received from the exercise of Series B Preferred Stock warrants
during 1994.
 
   
    Research and development expenses increased from $1,547,000 in 1993 to
$2,859,000 in 1994. Sales of research reagents remained relatively unchanged
from $50,000 in 1993 to $52,000 in 1994. The increase in 1994 was partly due to
the expansion of the Company's research and development program to include the
development of cancer vaccine products. The Company also intensified its HIV
program efforts during 1994, adding additional scientific and quality
assurance/quality control staff, including a Vice President of Medical Affairs
in October 1994, purchased more laboratory supplies, entered into new consulting
agreements and incurred additional rent expense of $124,000 by expanding its
laboratory space at the end of the second quarter of 1994.
    
 
   
    General and administrative expenses increased from $748,000 in 1993 to
$878,000 in 1994. In 1994, the Company incurred additional rent expense of
$41,000 due to the expansion of its office space at the end of the second
quarter of 1994, and incurred additional administrative expenses of $89,000 to
support
    
 
                                       22
<PAGE>
the Company's increased level of research and development. Interest expense
increased from $38,000 in 1993 to $50,000 in 1994, primarily due the acquisition
of additional equipment through capitalized leases as the Company expanded its
facilities. Depreciation and amortization increased from $249,000 in 1993 to
$289,000 in 1994 primarily due to the expansion of the Company's laboratory
facilities and the acquisition of additional equipment.
 
    The Company's net loss in 1993 was $2,395,000 compared to a net loss of
$3,412,000 in 1994.
 
LIQUIDITY AND CAPITAL RESOURCES
 
    The Company has funded its operations since inception primarily through
private placements of equity securities, which provided aggregate cash proceeds
of $22,781,000 (including loans that were subsequently converted into equity
securities). Through September 30, 1996, the Company had also received cash
proceeds of $1,656,000 from research grants, $633,000 from interest on
investments and $349,000 from the sale of research reagents. Through September
30, 1996, the Company had financed $1,228,000 of equipment purchases through
capitalized leases and a promissory note.
 
   
    During the fourth quarter of 1995 and the first quarter of 1996, the Company
raised $897,000 and $4,777,000 in net proceeds from the sale of approximately
44,900 units and 241,203 units, respectively, in a private placement of shares
of the Company's Series C Preferred Stock in a unit offering. Each $20.00 unit
("Series C Unit") consisted of four shares of Series C Preferred Stock and one
warrant entitling the holder to purchase one share of Series C Preferred Stock
for $5.00 any time within five years of the date of issuance ("Series C
Warrant"). In addition, during December 1995, a note payable in the aggregate
principal amount of $1,200,000, plus accrued and unpaid interest of $24,000 was
converted into approximately 61,200 Series C Units. At September 30, 1996, there
were 347,249 Series C Warrants outstanding which if exercised in full would
result in $1,736,000 of net proceeds to the Company and the issuance of 347,249
shares of Series C Preferred Stock or, if exercised subsequent to the offering,
260,455 shares of Common Stock.
    
 
    As of September 30, 1996, the Company had cash and cash equivalents totaling
$1,746,000 compared with $559,000 at December 31, 1995. Planned operations for
the remainder of 1996 currently contemplate expenditures for capital assets of
approximately $150,000, mainly consisting of laboratory equipment and leasehold
improvements to expand the Company's manufacturing capabilities. The Company
plans to finance a significant portion of equipment purchases through
capitalized leases. However, there can be no assurance that the Company will
successfully enter into such new arrangements. The Company's lease for all of
its facilities expires in April 1998. If the Company elects to move to a new
location, it may incur substantial expenses for leasehold improvements and
relocation costs. If the Company renews its current lease, certain costs will be
incurred to enhance its manufacturing capabilities.
 
    The Company believes that the net proceeds of this offering, together with
the Company's present capital resources, should be sufficient to fund operations
through the end of 1998 based on the Company's current operating plan. No
assurance can be given that there will be no change that would consume the
Company's liquid assets before such time. Thereafter, the Company will require
substantial funds to conduct development activities, preclinical studies,
clinical trials and other activities relating to the commercialization of any
potential products. In addition, the Company's cash requirements may vary
materially from those now planned because of results of research and development
and product testing, potential relationships with in-licensors and
collaborators, changes in the focus and direction of the Company's research and
development programs, competitive and technological advances, the cost of
filing, prosecuting, defending and enforcing patent claims, the regulatory
approval process, manufacturing and marketing and other costs associated with
the commercialization of products following receipt of regulatory approvals and
other factors.
 
   
    After the completion of the offering, the Company will have no committed
external sources of capital, and, as discussed above, expects no significant
product revenues for a number of years as it will take at
    
 
                                       23
<PAGE>
   
least that much time to bring the Company's products to the commerical marketing
stage. Therefore, the Company intends to seek additional financing, such as
through future offerings of equity or debt securities or agreements with
corporate partners and collaborators with respect to the development of the
Company's technology, to fund future operations. There can be no assurance,
however, that the Company will be able to obtain the additional funds it will
require on acceptable terms, if at all. If adequate funds are not available, the
Company may be required to delay, reduce the scope of or eliminate one or more
of its research or development programs; to obtain funds through arrangements
with collaborative partners or others that may require the Company to relinquish
rights to certain technologies, product candidates or products that the Company
would otherwise seek to develop or commercialize itself; or to license the
rights to such products on terms that are less favorable to the Company than
might otherwise be available. See "Risk Factors--History of Operating Losses and
Accumulated Deficit; No Product Revenue and Uncertainty of Future Profitability"
and "--Need for Additional Financing and Uncertain Access to Capital Funding."
    
 
IMPACT OF THE ADOPTION OF RECENTLY ISSUED ACCOUNTING STANDARD
 
    The Financial Accounting Standards Board issued Statement of Financial
Accounting Standards No. 123, "Accounting for Stock-Based Compensation" ("SFAS
123") in October 1995. See Note 2 to the Company's Financial Statements included
elsewhere in this Prospectus for a discussion of the impact of adoption of SFAS
123.
 
                                       24
<PAGE>
                                    BUSINESS
 
OVERVIEW
 
    Progenics is a biopharmaceutical company focusing on the development and
commercialization of innovative products for the treatment and prevention of
cancer and viral diseases. The Company applies its immunology expertise to
develop biopharmaceuticals that induce an immune response or that mimic natural
immunity in order to fight cancers, such as malignant melanoma, and viral
diseases, such as HIV infection. Progenics' most advanced product candidate,
GMK, is a therapeutic vaccine that is undergoing pivotal Phase III clinical
trials for the treatment of melanoma, a deadly form of skin cancer. Progenics'
second vaccine product, MGV, is being developed for the treatment of various
cancers, and recently entered Phase I/II clinical trials. Based on its
participation in the discoveries of two major receptors for HIV, the Company is
engaged in research and development of several therapeutic products designed to
block entry of the virus into human immune system cells. Progenics has completed
preclinical studies on two HIV product candidates, PRO 542 and PRO 367, and
plans to initiate Phase I/II clinical trials of these products in 1997.
 
    Progenics' most advanced product candidates are based on two proprietary
technologies: ganglioside conjugate vaccine technology, which the Company uses
in its cancer program; and UnAB technology, which the Company uses in its HIV
program. The Company has exclusively licensed from Sloan-Kettering several
ganglioside conjugate vaccines designed to stimulate the immune system to
destroy cancer cells. The Company applies its UnAB technology to produce
antibody-like molecules designed to neutralize or destroy HIV or HIV-infected
cells.
 
    CANCER THERAPEUTICS
 
    GMK is a therapeutic cancer vaccine designed to prevent recurrence of
melanoma in patients who are at risk of relapse after surgery. Developed at
Sloan-Kettering, GMK is composed of a ganglioside antigen which is abundant in
melanoma cells, conjugated to an immunogenic carrier protein and combined with
an adjuvant (an immunological stimulator). In August 1996, the Company commenced
the first of three pivotal, randomized, multicenter Phase III clinical trials of
GMK. These studies are being conducted in the United States by ECOG and SWOG,
which are cooperative cancer research groups supported by the NCI. Two
international Phase III clinical trials will be initiated in 1997 and will be
conducted in Europe by the ICR of the United Kingdom and the EORTC.
 
    MGV, the Company's second ganglioside conjugate vaccine, incorporates two
ganglioside antigens that are abundant in a wide range of cancer cells. These
cancers include colorectal cancer, lymphoma, small cell lung cancer, sarcoma,
gastric cancer, neuroblastoma and melanoma. In September 1996, MGV entered Phase
I/II clinical trials at Sloan-Kettering.
 
    HIV THERAPEUTICS
 
    The Company is pursuing two approaches based on its HIV receptor technology
in the research and development of products designed to block viral entry into
human immune system cells. The Company's UnAB approach is based on the CD4
receptor while its HIV fusion approach is based on a recently discovered second
receptor for the virus, CKR-5.
 
    Progenics is developing PRO 542 to selectively target HIV and prevent it
from infecting healthy cells by binding to the sites on the virus that are
required for entry into the cell. PRO 542 is based on Progenics' UnAB technology
and has been shown IN VITRO to recognize a wide range of HIV strains, including
those most prevalent in the United States and the rest of the world. PRO 542 is
being developed as an immunotherapy to treat HIV-positive individuals and as an
immunoprophylactic treatment to prevent infection of individuals who have been
exposed to the virus. The Company plans to file an IND covering PRO 542 by the
end of 1996 and initiate Phase I/II clinical trials in 1997.
 
                                       25
<PAGE>
    Progenics is developing PRO 367 as a therapeutic agent designed to kill
HIV-infected cells. PRO 367 consists of a UnAB molecule linked to a therapeutic
radioisotope and is designed to bind to and destroy HIV-infected cells by
delivering a lethal dose of radioactivity. The Company plans to begin Phase I/II
clinical trials of PRO 367 in 1997.
 
    In June 1996, the Company's scientists in collaboration with researchers at
ADARC described in an article published in NATURE the discovery of a second
receptor for HIV, CKR-5. This receptor enables fusion of HIV with the cell
membrane, entry of the viral genetic information into the cell and initiation of
viral replication. The Company is using its proprietary ProSys assay in a
program to discover novel therapeutics that specifically inhibit the interaction
of HIV with the CKR-5 receptor, thereby blocking viral fusion and entry.
 
THE HUMAN IMMUNE SYSTEM
 
    The human immune system functions to protect the body from disease by
specifically recognizing and destroying foreign invaders, including viruses and
bacteria. In addition, the immune system is capable of recognizing and
eliminating abnormal cells in the body, such as cancer cells and cells infected
with viruses and bacteria. White blood cells, particularly B and T lymphocytes,
have the ability to recognize antigens made by these infectious agents and
abnormal cells and react to them. For example, B lymphocytes produce antibodies
that recognize specific antigens. Antibodies can bind to these antigens and
neutralize or eliminate infectious agents and cancer cells. Vaccines can induce
the production of antibodies against antigens on infectious agents and abnormal
cells and thereby protect the body from illness. Vaccines are also being
developed as therapeutics to fight ongoing diseases. In addition, genetic
engineering techniques have enabled the production of antibodies or
antibody-like molecules in the laboratory. These genetically designed antibody
molecules may function in situations where the immune response is failing or not
present by mimicking the body's own immune response.
 
PRODUCT DEVELOPMENT
 
    The Company applies its expertise in immunology to the development of
therapeutic biopharmaceuticals that use components of the immune system,
particularly antibodies, to fight diseases. The Company's two principal programs
are directed towards cancer and HIV. In the case of cancer, the Company is
developing vaccine products that are designed to induce specific antibody
responses to cancer antigens in order to fight certain cancers. In the case of
HIV, the Company is developing therapeutic products by genetically engineering
molecules that function as antibodies and selectively target HIV and
HIV-infected cells for neutralization or destruction. The Company also is
actively engaged in research and discovery of therapeutic products based on a
second HIV receptor, CKR-5, and its role in viral fusion and entry.
 
                                       26
<PAGE>
    The following table summarizes the status of the principal development
programs, product candidates and products of the Company:
 
<TABLE>
<CAPTION>
         PROGRAM/PRODUCT                      INDICATION/USE                        STATUS(1)
- ----------------------------------  ----------------------------------  ----------------------------------
<S>                                 <C>                                 <C>
CANCER THERAPEUTICS
  GMK                               Vaccine for melanoma                Pivotal Phase III clinical trials
                                                                        ongoing
  MGV                               Vaccine for colorectal cancer,      Phase I/II clinical trials ongoing
                                    lymphoma, small cell lung cancer,
                                    sarcoma, gastric cancer,
                                    neuroblastoma and melanoma
HIV THERAPEUTICS
 
  PRO 542                           HIV therapy/prophylaxis             Phase I/II clinical trials
                                                                        expected to commence in 1997
  PRO 367                           HIV therapy                         Phase I/II clinical trials
                                                                        expected to commence in 1997
  CKR-5/Fusion                      HIV therapy                         Research
  (using ProSys)
  ProVax                            HIV vaccine                         Research
ASSAYS, DRUG SCREENING PROGRAM AND
REAGENTS
 
  ONCOTECT GM                       Clinical assay for cancer           In clinical investigational use
                                    prognosis
 
  HIV Attachment Drug Screen        High-throughput screening to        In use
                                    identify small-molecule drugs to
                                    treat HIV infection
 
  sCD4                              Research reagent                    On market
 
  gp120                             Research reagent                    On market
</TABLE>
 
  --------------------------
 
   (1)  "Research" includes initial research related to specific molecular
        targets, synthesis of new chemical entities and assay development for
        the identification of lead compounds.
 
        Phase I-III clinical trials denote safety and efficacy tests in humans
        as follows:
 
          Phase I: Evaluation of safety.
 
          Phase II: Evaluation of safety, dosage and efficacy.
 
        Phase III: Larger scale evaluation of safety and efficacy potentially
      requiring larger patient numbers, depending on
       the clinical indication for which marketing approval is sought.
 
   
       "In clinical investigation use" means being used by the Company to
       measure antibody levels of patients in clinical trials.
    
 
   
       "In use" means being used by a collaborator of the Company to identify
       novel small-molecule therapeutics.
    
 
   
       See "Business--Government Regulation" and "--Assays, Drug Screening
    
       Program and Reagents."
 
                                       27
<PAGE>
CANCER THERAPEUTICS
 
    The Company is currently developing two therapeutic cancer vaccines, one
specifically for melanoma and one for a variety of cancers, including colorectal
cancer, lymphoma, small cell lung cancer, sarcoma, gastric cancer, neuroblastoma
and melanoma.
 
    To date, the principal therapies for cancer have been surgery, radiation and
chemotherapy. In contrast to these invasive and toxic approaches, cancer
vaccines are now being developed to stimulate the natural defense mechanisms of
the immune system to fight cancer. Unlike traditional infectious disease
vaccines that are used to prevent infection in the general population, most
cancer vaccines are therapeutic, meaning that they are being developed to
prevent recurrence of cancer in people whose cancer is in remission. In some
cases, cancer vaccines are also being designed for use in the prevention of
cancer in individuals who are at high risk for the disease.
 
   
    A major challenge in cancer vaccine development is that the natural human
immune response generally does not produce sufficient antibodies to fight cancer
cells because the immune system often does not recognize the difference between
normal cells and cancer cells. Consequently, a primary objective in the
development of cancer vaccines is to train the immune system to recognize cancer
cells as a threat. If this can be achieved and the immune system can produce
sufficient antibodies to the cancer, then the recurrence of the cancer may be
prevented. Most cancer vaccines of parties other than the Company that are in
clinical development consist of dead cancer cells or crude extracts from cancer
cells. Unlike the Company's vaccine technology, the limitations of these
approaches include the inability to identify the active components of the
vaccine and to measure specific immune responses.
    
 
    PROGENICS' TECHNOLOGY: GANGLIOSIDE CONJUGATE VACCINES
 
    Progenics' cancer vaccine program is different from other approaches in that
it involves the use of purified gangliosides as cancer antigens. Gangliosides
are chemically-defined molecules which are composed of carbohydrate and lipid
components. Certain gangliosides are usually found in low amounts in normal
human tissue, but are abundant in certain cancers, such as melanoma, colorectal
cancer, lymphoma, small cell lung cancer, sarcoma, gastric cancer and
neuroblastoma.
 
    Gangliosides alone, however, do not normally trigger an immune response in
humans. To overcome this, Progenics attaches gangliosides to large, highly
immunogenic carrier proteins to form "conjugate" vaccines designed to trigger
specific immune responses to ganglioside antigens. The technique of conjugating
carbohydrate molecules to carrier proteins has been successfully used by others
in the past to create effective vaccines for certain infectious diseases. For
example, conjugate vaccines have been approved for marketing by the FDA and are
currently administered to infants and children to prevent certain bacterial
infections. To further augment the immune response to gangliosides, Progenics
adds a potent immunological stimulator known as an "adjuvant" to its
ganglioside-carrier protein conjugate. The following diagram illustrates the
components of the Company's ganglioside conjugate vaccines.
 
                                       28
<PAGE>
[DIAGRAM ILLUSTRATING THE COMPONENTS OF THE COMPANY'S GANGLIOSIDE CONJUGATE 
VACCINES]
 
    The Company's ganglioside conjugate vaccines stimulate the immune system to
produce specific antibodies to ganglioside antigens. These antibodies have been
shown IN VITRO to recognize and destroy cancer cells. Based on these tests and
the clinical trial results described below, the Company believes that
vaccination of cancer patients with ganglioside conjugate vaccines will prevent
recurrence of cancer and prolong overall survival.
 
    The Company's cancer vaccines use known amounts of chemically-defined
antigens, not dead cancer cells or crude extracts from cancer cells. As a
result, Progenics is able to measure specific immune responses to the
gangliosides in its vaccines. The Company also believes that there is a reduced
likelihood of variability in its products as compared to vaccines which are
prepared from dead cancer cells or crude extracts from cancer cells or which
require complicated manufacturing processes.
 
    GMK: THERAPEUTIC VACCINE FOR MALIGNANT MELANOMA
 
    Progenics' most advanced product under development is GMK, a proprietary
therapeutic vaccine for melanoma that is currently in pivotal Phase III clinical
trials. GMK is the first cancer vaccine based on a defined cancer antigen to
enter Phase III clinical trials. GMK was initially developed at Sloan-Kettering
and is exclusively licensed to the Company. GMK is designed to prevent
recurrence of melanoma in patients who are at risk of relapse after surgery. GMK
is composed of the ganglioside GM2 conjugated to the carrier protein KLH
(keyhole limpet hemocyanin) and combined with the adjuvant QS-21. QS-21 is the
lead compound in the Stimulon-TM- family of adjuvants developed and owned by
Aquila.
 
    TARGET MARKET
 
    Melanoma is a highly lethal cancer of the skin cells that produce the
pigment melanin. In early stages melanoma is limited to the skin, but in later
stages it spreads to the lungs, liver, brain and other organs. The Company
estimates that there are 300,000 melanoma patients in the U.S. today. The
American Cancer Society estimates that 38,000 patients in the U.S. will be newly
diagnosed with melanoma in 1996. In the U.S., the incidence of melanoma is
increasing at a rate of approximately 6% per year, an increase in incidence that
is faster than that of any other cancer in men and second only to lung cancer in
women. It is estimated that one in 87 Americans will develop melanoma in their
lifetime. Increased exposure to the
 
                                       29
<PAGE>
ultraviolet rays of the sun may be an important factor contributing to the
increase in new cases of melanoma.
 
    Melanoma patients are categorized according to the following staging system:
 
                                MELANOMA STAGING
 
<TABLE>
<CAPTION>
       STAGE I               STAGE II               STAGE III              STAGE IV
- ---------------------  ---------------------  ---------------------  ---------------------
<S>                    <C>                    <C>                    <C>
- -   lesion less than   -   lesion greater     -   metastasis to      -   distant
    1.5 mm thickness     than 1.5 mm              regional draining      metastasis
                           thickness              lymph nodes
- -   no apparent        -   local spread from  -   regional spread
    metastasis             primary cancer         from primary
                           site                   cancer site
</TABLE>
 
    GMK is designed for the treatment of patients with Stage II or Stage III
melanoma. It is estimated that these patients comprise about 50% of the total
number of melanoma patients and, accordingly, the Company estimates that there
are currently 150,000 Stage II and III melanoma patients in the U.S. According
to the American Cancer Society, an estimated 60% to 80% of Stage III melanoma
patients will experience recurrence of their cancer and die within five years
after surgery.
 
    CURRENT THERAPIES
 
    Standard treatment for all melanoma patients includes surgical removal of
the cancer. Thereafter, therapy varies depending on the stage of the disease.
For Stage I and II melanoma patients, treatment generally consists of close
monitoring for recurrence. The only approved treatment for Stage III melanoma
patients is high-dose alpha interferon, which received FDA marketing approval
for this indication in December 1995. In a recently reported study, the median
recurrence-free survival period after surgery for patients treated with
high-dose alpha interferon was 20 months versus 12 months for patients who
received no treatment. In addition, the median overall survival period after
surgery was 46 months for the treated group versus 34 months for the untreated
group. However, treatment with high-dose alpha interferon causes substantial
toxicities, requires an intensive treatment over twelve months (intravenous
injections five days a week for the first month followed by subcutaneous
injections three times a week for the remaining eleven months) and costs about
$35,000 per year.
 
    Other approaches for treatment of Stage II or III melanoma patients are
currently under investigation, but none has been approved for marketing. These
experimental therapies include chemotherapy, low-dose alpha interferon and other
vaccines.
 
    CLINICAL TRIALS
 
   
    GMK entered pivotal Phase III clinical trials in the United States in August
1996. In addition, Progenics plans to initiate two international Phase III
clinical trials of GMK in 1997. GMK is administered in the studies by 12
subcutaneous injections over a two-year period on an out-patient basis.
    
 
    The ongoing U.S. Phase III trial compares GMK with high-dose alpha
interferon in Stage IIb (advanced Stage II) and Stage III melanoma patients who
have undergone surgery but are at high risk for recurrence. This randomized
trial, which is expected to enroll 850 patients, is being conducted nationally
by ECOG in conjunction with SWOG and other major cancer centers, cooperative
cancer research groups, hospitals and clinics. ECOG and SWOG are leading
cooperative cancer research groups supported by the NCI and are comprised of
several hundred participating hospitals and clinics in the United States. The
primary endpoint of the trial is to compare the recurrence of melanoma in
patients receiving GMK versus in patients receiving high-dose alpha interferon.
The study will also compare quality of life and overall survival of patients in
both groups.
 
                                       30
<PAGE>
    The second Phase III clinical trial will be a double-blind,
placebo-controlled study in Stage IIb and Stage III melanoma patients who have
undergone surgery but are at high risk for recurrence. This trial will be
conducted by major cancer centers, hospitals and clinics in Europe, Australia,
and New Zealand. In the United Kingdom, the study will be conducted by the ICR,
a major government-sponsored cancer research organization. Patients will be
randomized to receive either GMK or a placebo (because high-dose alpha
interferon has not been approved for use in melanoma in the countries involved
in this trial). The primary endpoint of the trial is to compare the recurrence
of melanoma in patients receiving GMK versus in patients receiving placebo. The
study will also compare overall survival of patients in both groups.
 
    The third Phase III clinical trial will be a randomized study exclusively in
Stage II melanoma patients who have undergone surgery but are at intermediate
risk for recurrence. This trial will be conducted in Europe by the EORTC, the
major cooperative cancer research group in Europe, and in the United States by
ECOG. Patients will be randomized to receive either GMK or observation with no
treatment. The primary endpoint of the trial is to compare the recurrence of
melanoma in patients receiving GMK versus in patients receiving observation with
no treatment. The study will also compare overall survival of patients in both
groups.
 
    A predecessor of GMK, called GM2-BCG, which combined GM2 ganglioside with
the adjuvant BCG, underwent clinical testing at Sloan-Kettering in the late
1980s. In a double-blind, randomized Phase II study in 122 Stage III melanoma
patients, subjects in the treated group received GM2-BCG for six months after
surgery; subjects in the control group received the same regimen with BCG alone.
The median recurrence-free survival period after surgery for patients treated
with GM2-BCG was 33 months versus 17 months for the patients in the control
group. In addition, the median overall survival period after surgery for
patients in the treated group was 70 months versus 30 months for patients in the
control group. Approximately 85% of treated patients developed antibodies to GM2
ganglioside. The presence of these antibodies significantly correlated with
improved recurrence-free and overall survival of patients.
 
    Phase I/II clinical trials of GMK under institutional INDs were conducted at
Sloan-Kettering over the last five years. In these studies, approximately 120
patients, most of whom had Stage III melanoma, were treated with GMK. All
patients receiving GMK at the dose level being used in the current Phase III
trials of GMK developed antibodies to GM2 ganglioside. Patients treated with GMK
had levels of antibody to GM2 ganglioside that were on average four times higher
and also were longer lasting than in patients treated with GM2-BCG in the
GM2-BCG Phase II trial. In addition, GMK was well tolerated by all patients in
these studies, and no clinically significant side effects attributable to the
vaccine were observed.
 
    MGV: THERAPEUTIC VACCINE FOR CERTAIN CANCERS
 
    Progenics' second ganglioside conjugate vaccine in development, MGV, is a
proprietary therapeutic vaccine for cancers which express GD2 or GM2
gangliosides. These cancers include colorectal cancer, lymphoma, small cell lung
cancer, sarcoma, gastric cancer, neuroblastoma and melanoma. MGV has three
components: (i) GM2-KLH (GM2 ganglioside conjugated to KLH); (ii) GD2-KLH (GD2
ganglioside conjugated to KLH); and, (iii) QS-21 adjuvant. MGV is designed to
prevent recurrence of cancer and prolong overall survival of patients after
their cancer has been removed by surgery or reduced by chemotherapy or radiation
therapy.
 
    CLINICAL TRIALS
 
    MGV entered Phase I/II clinical trials in September 1996 under an
institutional IND at Sloan-Kettering. The primary objectives of the study are to
establish the safety of MGV and the ability of the vaccine to induce specific
immune responses to both GD2 and GM2 gangliosides in patients with different
cancer types, beginning with melanoma patients. In addition, a goal of the study
is to optimize the ratio of GD2 and GM2 gangliosides in MGV to be used in future
clinical trials.
 
    The GM2-KLH/QS-21 (GMK) and GD2-KLH/QS-21 components of MGV have each
undergone separate clinical testing. The results of clinical studies with GMK
are discussed above. To date, six
 
                                       31
<PAGE>
melanoma patients have received GD2-KLH/QS-21 alone in Phase I/II clinical
trials under an institutional IND at Sloan-Kettering. All six subjects developed
antibodies to GD2 ganglioside following vaccination. In addition, the vaccine
was well tolerated and no clinically significant side effects attributable to
the vaccine were observed. Therefore, the Company expects that patients
receiving MGV will develop antibodies to both GD2 and GM2 gangliosides.
 
HIV THERAPEUTICS
 
    HIV infection causes a slowly progressive deterioration of the immune system
which results in AIDS. AIDS is characterized by a general collapse of the immune
system leading to a wasting syndrome, frequent opportunistic infections, rare
forms of cancer, central nervous system degeneration, and eventual death. HIV
infection is unusual in that individuals testing positive for the virus can
survive for many years without symptoms of the disease. There are three major
routes of transmission of the virus: sexual contact, exposure to
HIV-contaminated blood or blood products and mother-to-child transmission.
 
    HIV specifically infects cells that have the CD4 receptor on their surface
("CD4+"). CD4+ cells are critical components of the immune system, and include T
lymphocytes, monocytes, macrophages and dendritic cells. The deleterious effects
of HIV are largely due to the replication of the virus in CD4+ T lymphocytes and
the resulting destruction of these cells.
 
    HIV-positive individuals display both antibodies and other immune system
responses which are specific to the virus. However, the high fatality rate of
this disease makes it clear that these natural immune system responses do not
provide adequate long-term protection. There are two reasons why these natural
responses are inadequate. First, as described above, the CD4+ T lymphocytes
required to mount an effective immune response against HIV are destroyed,
leaving the immune system too weak to eliminate the virus. Second, HIV displays
a remarkable degree of variability as a result of high rates of mutation that
permit different strains of the virus to escape the immune system response and
progressively replicate throughout the body.
 
    The Company's scientists and their collaborators have made important
discoveries in understanding how HIV enters human cells and initiates viral
replication. In the 1980s, Company scientists in collaboration with researchers
at Columbia University, the ICR and the Centers for Disease Control and
Prevention ("CDC") demonstrated that the initial step of HIV infection involves
the specific attachment of the virus to the CD4 receptor on the surface of human
immune system cells. These researchers also showed that the gp120 glycoprotein
located on the HIV envelope binds with high affinity to the CD4 receptor.
Although these researchers demonstrated that CD4 was necessary for HIV
attachment, this step is not sufficient to enable the virus to enter the cell
and initiate viral replication.
 
    In June 1996, Company scientists in collaboration with researchers at ADARC
described in an article in NATURE the discovery of a second receptor for HIV on
the surface of human immune system cells. This receptor, CKR-5, enables fusion
of HIV with the cell membrane after binding of the virus to the CD4 receptor.
This fusion step results in entry of the viral genetic information into the cell
and subsequent viral replication. Recently, Company scientists in collaboration
with researchers at ADARC demonstrated that it is the gp120 glycoprotein that
binds to the newly discovered CKR-5 receptor as well as to the CD4 receptor.
This process is shown below.
 
                                       32
<PAGE>
   [DIAGRAM DEPICTING THE GP120 GLYCOPROTEIN BINDING TO THE NEWLY DISCOVERED
   CKR-5 RECEPTOR AND THE CD4 RECEPTOR AND ALSO THE FUSION OF THE VIRUS WITH
                            THE HUMAN CELL MEMBRANE]
 
    PROGENICS' HIV RECEPTOR TECHNOLOGIES: UNABS AND CKR-5/FUSION
 
    Based on the Company's participation in the discoveries of two major
receptors for HIV, Progenics is pursuing two approaches in the research and
development of products designed to block entry of HIV into human immune system
cells. The Company's UnAB approach is based on the CD4 receptor while its HIV
fusion approach is based on a recently discovered second receptor, CKR-5.
 
    Because HIV must first attach to the CD4 receptor to infect human cells, the
Company believes that the part of the gp120 glycoprotein that attaches to the
CD4 receptor must remain constant across all strains of the virus. The gp120
glycoprotein is located on the exterior of both HIV and HIV-infected cells.
Progenics' UnABs incorporate a part of the CD4 receptor into
genetically-engineered molecules that function like antibodies and are designed
to bind specifically to the gp120 glycoprotein of HIV or HIV-infected cells. In
IN VITRO tests, the Company's UnABs have demonstrated the ability to bind with
high affinity to gp120 glycoproteins from a wide range of HIV strains, including
the strains most prevalent in the U.S. and the rest of the world. Because the
Company's UnAB technology is targeted to a part of HIV that must remain constant
in order for the virus to enter cells, the Company believes that its technology
may address the obstacles presented by the high mutation rate of the virus.
 
    Two of the Company's HIV products under development are based on its
proprietary UnAB technology, although they employ the technology in different
ways. PRO 542 is designed to bind to the gp120 glycoprotein located on the virus
itself, thereby preventing it from infecting healthy cells. PRO 367 is designed
to bind to the gp120 glycoprotein located on the exterior of HIV-infected cells
and destroy those cells by delivering a lethal dose of radioactivity. The two
products also differ in that each molecule of PRO 542 has four binding sites for
HIV while each molecule of PRO 367 has two binding sites. See the inside back
cover of this Prospectus for diagrams of these products. In the area of HIV
fusion, the Company is using its proprietary ProSys assay in a program to
discover novel therapeutics that specifically inhibit the interaction of HIV
with the CKR-5 receptor, thereby blocking viral fusion and entry.
 
    TARGET MARKET
 
    Progenics' therapeutic product candidates are designed primarily for use in
asymptomatic HIV-positive individuals. Accordingly, the target population for
these products is patients who are aware of their infection but do not yet have
AIDS. Although there are few signs of disease in an HIV-positive individual
during the asymptomatic period, the virus is replicating in the body by
infecting healthy cells. The World Health Organization estimated that in 1994
more than 700,000 people in the U.S. and 17,000,000 people worldwide were
infected with HIV. The CDC estimated that as of December 1995 more than 190,000
people in the U.S. had AIDS. AIDS is currently the leading cause of death in the
U.S. in men between the ages of 25 and 44 and the third leading cause of death
in the U.S. in women between those ages.
 
                                       33
<PAGE>
   
    An additional potential market for the Company's HIV product candidates
consists of individuals who are at risk of becoming HIV-positive because they
have been exposed to the virus, such as: (i) health care workers exposed to
HIV-contaminated body fluids through accidental needlestick injuries; and (ii)
babies born to HIV-positive women. According to a recent academic study, in 1990
there were over 250,000 percutaneous needlestick injuries among U.S. hospital
employees. The CDC reported that in 1993 there were approximately 7,000 children
born to HIV-positive women in the U.S.
    
 
    CURRENT THERAPIES
 
    At present, two classes of products have received FDA marketing approval for
the treatment of HIV infection and AIDS: reverse transcriptase inhibitors and
protease inhibitors. Both types of drugs are inhibitors of viral enzymes and
have shown efficacy in reducing the concentration of HIV in the blood and
prolonging asymptomatic periods in HIV-positive individuals, especially when
administered in combination. However, it is not known whether HIV will develop
resistance to these drugs over time. In addition, the use of these drugs
presents problems of toxic side effects and compliance for some patients.
 
    PRO 542: HIV THERAPY/PROPHYLAXIS
 
    Progenics is developing PRO 542 for the treatment and post-exposure
prevention of HIV infection. PRO 542 is a proprietary UnAB-based product with
four binding sites for the gp120 glycoprotein on HIV. PRO 542 is designed to
neutralize infectious HIV through one of two mechanisms: (i) binding to and
thereby blocking the gp120 glycoprotein; or (ii) binding to and detaching the
gp120 glycoprotein from the virus.
 
    In IN VITRO and EX VIVO tests conducted by Progenics in collaboration with
scientists at ADARC and the CDC, PRO 542 potently neutralized a wide variety of
clinical strains of HIV as well as viruses in the plasma of HIV-positive
individuals. In comparative IN VITRO studies at ADARC using a panel of
neutralizing antibodies to HIV, PRO 542 was found to be more potent and broadly
neutralizing than the antibodies to which it was compared. In further studies at
ADARC, PRO 542 protected severe combined immune deficient ("SCID") mice
transplanted with human peripheral blood lymphocytes against infection by the
three HIV strains tested, including strains of the virus isolated from
HIV-positive individuals.
 
    Progenics plans to file an IND for PRO 542 in 1996 and, subject to its IND
becoming effective, initiate two dose-escalation Phase I/II clinical trials in
1997. The first study will be conducted in HIV-positive adult patients at Mount
Sinai Medical Center and the Bronx V.A. Medical Center, both in New York City.
The second trial will be conducted in HIV-positive children at Baylor College of
Medicine in Houston by the AIDS Clinical Trials Group, ("ACTG"), a leading
cooperative HIV research group supported by the National Institute of Allergy
and Infectious Diseases ("NIAID"). Both trials will measure safety,
pharmacokinetics and antiviral activity of PRO 542.
 
    PRO 367: HIV THERAPY
 
    Progenics is developing PRO 367 as a therapeutic agent designed to destroy
HIV-infected cells. PRO 367 is composed of a proprietary UnAB molecule with two
binding sites for the gp120 glycoprotein linked to a therapeutic radioisotope.
PRO 367 is designed to specifically bind with high affinity to the gp120
glycoprotein on HIV-infected cells and to destroy these cells by delivering a
lethal dose of radioactivity.
 
    The Company plans to initiate dose-escalation Phase I/II clinical trials of
PRO 367 in 1997, subject to obtaining necessary regulatory approvals. The PRO
367 study will be conducted by the French Association Nationale de Recherches
contre le SIDA at the Pitie-Salpetriere Hospital in Paris. The study will assess
safety, pharmacokinetics, biodistribution and antiviral effects of PRO 367 in
HIV-positive adult patients.
 
    In IN VITRO tests, PRO 367 specifically bound with high affinity to the
gp120 glycoprotein on the cell surface. In addition, a pilot Phase I clinical
trial in AIDS patients of a trace-labelled precursor of PRO 367
 
                                       34
<PAGE>
is being conducted under an institutional IND at Sloan-Kettering. This trial is
assessing the safety, pharmacology and biodistribution of the compound with low
doses of iodine-131. To date, the compound has been well tolerated by all
patients and no clinically significant side effects attributable to the compound
have been observed.
 
    CKR-5/FUSION (USING PROSYS): HIV THERAPY
 
    The Company's first application of its CKR-5 receptor technology is a
proprietary assay known as ProSys. ProSys models fusion of HIV with human cells
by means of a rapid, automated and sensitive assay that does not involve the use
of infectious virus. Progenics is using ProSys in a program to discover novel
biologic and small-molecule therapeutics that specifically inhibit the
interaction between HIV and the CKR-5 receptor, thereby blocking viral fusion
and entry. Progenics is currently seeking pharmaceutical company collaborators
for this program.
 
    PROVAX: HIV VACCINE
 
    Progenics is conducting research with respect to ProVax, a vaccine candidate
which it believes will be useful as a preventative or a therapeutic treatment
for HIV-positive individuals. Progenics is currently performing
government-funded research and development of ProVax in collaboration with
ADARC, the Southwest Foundation for Biomedical Research in San Antonio and the
University of Oklahoma Medical Center.
 
ASSAYS, DRUG SCREENING PROGRAM AND REAGENTS
 
    Through its immunology expertise, Progenics has developed certain assays
which are used both independently and in collaboration with partners, as well as
certain reagents which are being sold for research use only.
 
    ONCOTECT GM
 
    Progenics has developed ONCOTECT GM, a clinical assay for assessing
prognosis in patients with melanoma and other cancers. ONCOTECT GM measures the
levels of antibody to GM2 ganglioside in the blood. In clinical trials of a
therapeutic vaccine for melanoma, the presence of these antibodies significantly
correlated with improved recurrence-free and overall survival of patients. The
Company is currently using ONCOTECT GM in its cancer vaccine clinical trials.
 
    HIV ATTACHMENT DRUG SCREEN
 
    Progenics, as part of a collaborative development project with American
Cyanamid Company ("American Cyanamid"), a subsidiary of American Home Products
Corporation ("American Home Products"), has developed a proprietary drug
screening assay designed to identify novel small-molecule therapeutics for HIV
infection which inhibit attachment of the virus to the CD4 receptor. This assay
has been used in a high-throughput screening program. The Company and American
Cyanamid have agreed that all discoveries made in the course of their
collaboration will be jointly owned. Progenics and the Wyeth-Ayerst Research
Division of American Home Products plan to perform additional studies to
evaluate the antiviral activity of the compounds discovered in the course of the
screening program.
 
    RESEARCH REAGENTS: SCD4 AND GP120
 
   
    Progenics manufactures the research reagents sCD4 and gp120 which it sells
to DuPont de Nemours & Company ("DuPont") and Intracel Corporation ("Intracel")
for resale. DuPont markets and sells gp120 and sCD4 under both the Progenics and
the DuPont names. Intracel markets and sells gp120 and sCD4 under both the
Progenics and Intracel names. These products are sold worldwide for research
use. While the Company's only customers for these reagents are DuPont and
Intracel, in light of the
    
 
                                       35
<PAGE>
   
limited revenues received from sales of these reagents, the Company does not
believe that the loss of either of these customers would have a material adverse
effect on the Company.
    
 
BUSINESS STRATEGY
 
    Progenics' strategy is to develop innovative products for the treatment and
prevention of cancer and viral diseases based upon its expertise in immunology.
Key elements of the Company's strategy are as follows:
 
    LEVERAGE CORE PROPRIETARY TECHNOLOGIES.  Progenics is developing a portfolio
of therapeutic cancer vaccines and HIV treatments utilizing its proprietary
ganglioside conjugate vaccine, UnAB and CKR-5/fusion technologies. Progenics has
recently commenced pivotal Phase III clinical trials of GMK and Phase I/II
clinical trials of MGV, and plans to initiate clinical trials of its HIV
products in 1997. The Company also is actively involved in research based on the
discovery of a second HIV receptor, CKR-5, and its role in viral fusion and
entry. The Company is exploring additional applications of these existing core
technologies. For example, the Company is continuing to screen additional
cancers for the presence of specific gangliosides in order to develop vaccines
to treat a variety of cancers and continues to perform additional research into
the mechanism of HIV entry into the cell.
 
    IN-LICENSE ADDITIONAL PRODUCT CANDIDATES AND TECHNOLOGIES.  The Company
intends to continue to in-license technologies and product candidates that
complement its existing capabilities. Sources for these technologies range from
academic institutions and research organizations to other biotechnology and
pharmaceutical companies. In particular, the Company's license agreement with
Sloan-Kettering covers certain future developments in the cancer vaccine field
resulting from work performed in a laboratory at Sloan-Kettering. The Company
believes this in-licensing strategy will enable it to bring products to market
more quickly, efficiently and at lower cost while it focuses its expertise on
product development and pre-clinical and clinical trial design and
implementation.
 
   
    ESTABLISH COLLABORATIONS TO MINIMIZE DEVELOPMENT COSTS AND ACCESS
EXPERTISE.  Progenics has carefully controlled its expenditures on early stage
research, clinical trials and related infrastructure by establishing
collaborations with leading research institutions and clinical research
organizations. For example, Progenics currently has collaborations with academic
and government institutions such as Sloan-Kettering, ADARC and the CDC, and
clinical research groups such as ECOG, SWOG, ICR and EORTC. Many of the costs of
basic research and clinical trials are funded directly by these organizations,
which enables the Company to substantially reduce its financing requirements. In
addition, collaboration with these groups allows the Company to access their
substantial expertise. Finally, Progenics has funded, and plans to continue to
fund, a significant portion of certain of its programs with government research
grants and contracts.
    
 
    SELECT AN APPROPRIATE COMMERCIALIZATION STRATEGY FOR EACH
PRODUCT.  Progenics will determine what it believes to be the most expedient and
cost-effective way to commercialize each product that it develops. Progenics may
undertake to manufacture, market and sell the product itself, or may undertake
one or more of these functions in conjunction with third-party manufacturers,
marketers, distributors, representatives, licensors or others. To date,
Progenics has retained all commercial rights to its four principal products, all
of which have entered, or are about to enter, human clinical trials. As a
result, the Company believes that it will be able to retain a greater share of
the economic value of these products which it, or a collaborator selected by it,
is able to bring to market. The key factors that will guide Progenics in making
each of these decisions are the nature of the product, the facilities and skills
required to manufacture the product, the anticipated distribution channels and
required marketing capabilities and the resources and skills of prospective
collaborators.
 
                                       36
<PAGE>
LICENSES
 
    The Company is a party to license arrangements under which it has obtained
rights to use certain technologies in its cancer and HIV programs. Set forth
below is a summary of those licenses that the Company believes to be important
to its business.
 
    The Company is party to a license agreement with Sloan-Kettering under which
the Company obtained the worldwide, exclusive rights to certain technology
relating to ganglioside conjugate vaccines, including GMK and MGV, and their use
to treat or prevent cancer. The Sloan-Kettering license terminates upon the
expiration of the last of the licensed patents or 15 years from the date of the
first commercial sale of a licensed product pursuant to the agreement, whichever
is later. In addition to patent applications, the Sloan-Kettering license
includes the exclusive rights to use certain relevant technical information and
know-how, as well as rights to certain future developments. A number of
Sloan-Kettering physician-scientists also serve as consultants to the Company.
 
    The Company is party to a license agreement with The Regents of the
University of California under which the Company obtained the exclusive rights
to an issued U.S. patent covering certain ganglioside conjugate vaccines. The
license agreement terminates upon the expiration of the patent.
 
    The Company is party to a license agreement with Columbia University under
which the Company has obtained exclusive, worldwide rights to certain technology
and materials relating to CD4 and its use to treat or prevent HIV infection. The
license agreement will terminate upon the expiration of the last of the licensed
patents.
 
    The Company has entered into a license and supply agreement with Aquila
pursuant to which Aquila agreed to supply the Company with all of its
requirements for the QS-21 adjuvant for use in certain ganglioside-based cancer
vaccines, including GMK and MGV. The agreement grants to the Company a license
to use Aquila's patented technology to develop, manufacture and sell certain
cancer vaccines using QS-21 and, if Aquila is unable to supply the Company with
sufficient quantities of QS-21, the Company has the right to manufacture QS-21
itself or purchase it from third parties for so long as Aquila is unable to
supply the Company with sufficient quantities of QS-21. QS-21 is the lead
compound in the Stimulon-TM- family of adjuvants developed and owned by Aquila.
The license terminates upon the expiration of the last of the licensed patents.
 
   
    The licenses to which the Company is a party impose various milestone,
commercialization, sublicensing, royalty and other payment, insurance and other
obligations on the Company. Failure by the Company to comply with these
requirements could result in the termination of the applicable agreement, which
could have a material adverse effect on the Company's business.
    
 
RESEARCH AND DEVELOPMENT COLLABORATIONS
 
    The Company has entered into collaborative agreements with various parties
relating to its cancer and HIV programs. Set forth below is a summary of those
collaborations that the Company believes to be important to its business.
 
    The Company is working on a collaborative basis with ADARC with respect to
the development of certain of the Company's HIV products. Under the agreement
with ADARC, the Company is obligated to pay the salary of an ADARC technician
who works on scientific projects of mutual interest to the Company and ADARC.
 
    The Company is party to a cooperative research and development agreement
with the CDC to conduct collaborative research on certain of the Company's HIV
products. Under the agreement with the CDC, the Company provides researchers
with certain materials for investigation at the CDC. The agreement with the CDC
terminates when the research plan, as described in the agreement, is completed,
unless earlier terminated by the parties.
 
                                       37
<PAGE>
    In general, the Company's collaborative research agreements require the
payment by Progenics of various amounts in support of the research to be
conducted. If the collaborator creates any invention during the course of its
efforts, solely or jointly with the Company, the Company generally has an option
to negotiate an exclusive, royalty-bearing license of the collaborator's rights
in the invention for the purpose of commercializing any product incorporating
such invention. Inventions developed solely by the Company's scientists as part
of the collaboration generally are owned exclusively by the Company. Most of
these collaborative agreements are non-exclusive and can be cancelled on
relatively short notice.
 
   
    The Company has also entered into collaborative arrangements with
Sloan-Kettering, ECOG, SWOG, ICR and EORTC with respect to its clinical trials.
See "Business--Cancer Therapeutics--GMK: Therapeutic Vaccine for Malignant
Melanoma--Clinical Trials" and "--Cancer Therapeutics--MGV: Therapeutic Vaccine
for Certain Cancers--Clinical Trials."
    
 
GOVERNMENT GRANTS
 
   
    Through September 30, 1996, the Company had been awarded government grants,
aggregating approximately $2,359,000 under the Small Business Innovation
Research ("SBIR") program of the NIH for the Company's commercial development of
PRO 542, PRO 367, ProVax and ProSys. Through September 30, 1996 the Company had
recognized approximately $1,298,000 of such amount as revenue. In addition, the
Company has been awarded a $812,000 multi-year grant under a contract with the
Department of Defense for work related to ProVax. Through September 30, 1996 the
Company had recognized approximately $437,000 of such amount as revenue.
    
 
    Under the terms of these grants, the Company has, subject to certain rights
of the government described below, all right, title and interest to all patents,
copyrights and data pertaining to any product developed. However, under existing
regulations, the government receives a royalty-free license for federal
government use with respect to patents developed by grant recipients. In
addition, the government may, in certain circumstances, require the Company to
license technology resulting from the funded projects to third parties and may
require that the Company manufacture substantially all of the products resulting
from a particular grant in the United States.
 
    The government's obligation to make payments under these grants is subject
to appropriation by the United States Congress for funding in each such year.
Moreover, it is possible that Congress or the government agencies that
administer these government research programs will determine to scale back these
programs or terminate them or that the government will award future grants to
competitors of the Company instead of the Company. In addition, while Progenics
intends to pursue additional government grants related to its areas of research
and development, there can be no assurances that the Company will be awarded any
such grants in the future or that any amounts derived therefrom will not be less
than those received to date.
 
PATENTS AND PROPRIETARY TECHNOLOGY
 
    Progenics' policy is to protect its proprietary technology, and the Company
considers the protection of such rights to be important to its business. In
addition to seeking U.S. patent protection for many of its inventions, the
Company generally files patent applications in Canada, Japan, Western European
countries and additional foreign countries on a selective basis in order to
protect the inventions deemed to be important to the development of its foreign
business.
 
    Under a license agreement with Sloan-Kettering, Progenics obtained
worldwide, exclusive rights to certain technology relating to ganglioside
conjugate vaccines, including GMK and MGV, and their use to treat or prevent
cancer. This technology is the subject of a patent application filed by
Sloan-Kettering in the U.S. and 14 foreign countries claiming composition of
matter and methods of production and use of certain ganglioside conjugate
vaccines for the treatment or prevention of human cancer.
 
                                       38
<PAGE>
   
    Under a license agreement with Columbia University, Progenics obtained
worldwide, exclusive rights to certain technology relating to CD4 and its use to
treat or prevent HIV infection. This technology is the subject of issued U.S.
and European patents and several related U.S. and foreign patent applications
filed by Columbia University. The issued patents and the patent applications
claim composition of matter and methods of production and use of certain
CD4-based products for the treatment or prevention of HIV infection. Progenics
has also filed a number of U.S. and foreign patent applications on its UnAB,
ProSys and ProVax technologies and clinical uses of these technologies.
    
 
    There can be no assurance that patent applications owned by or licensed to
the Company will result in patents being issued or that, if issued, the patents
will afford protection against competitors with similar technology. Although a
patent has a statutory presumption of validity in the United States, the
issuance of a patent is not conclusive as to such validity or as to the
enforceable scope of the claims of the patent. There can be no assurance that
the Company's issued patents or any patents subsequently issued to or licensed
by the Company will not be successfully challenged in the future. The validity
or enforceability of a patent after its issuance by the patent office can be
challenged in litigation. The cost of litigation to uphold the validity of
patents and to prevent patent infringement can be substantial. If the outcome of
the litigation is adverse to the owner of the patent, third parties may then be
able to use the invention covered by the patent without payment. There can be no
assurance that the Company's patents will not be infringed or successfully
avoided through design innovation.
 
    There may be patent applications and issued patents belonging to competitors
that may require the Company to alter its products, pay licensing fees or cease
certain activities. If the Company's products conflict with patents that have
been or may be granted to competitors, universities or others, such other
persons could bring legal actions against the Company claiming damages and
seeking to enjoin manufacturing and marketing of the affected products. If any
such actions are successful, in addition to any potential liability for damages,
the Company could be required to obtain a license in order to continue to
manufacture or market the affected products. There can be no assurance that the
Company would prevail in any such action or that any license required under any
such patent would be made available on acceptable terms or at all. The Company
believes that there may be significant litigation in the industry regarding
patent and other intellectual property rights. If the Company becomes involved
in such litigation, it could consume substantial resources.
 
    Progenics has also filed a number of U.S. and foreign patent applications
(one of which is owned jointly with ADARC) relating to the discovery of a second
HIV receptor, CKR-5. In addition to the risks described above, the Company is
aware that other groups have claimed discoveries similar to that covered by the
Company's patent applications. These groups may have made their discoveries
prior to the discoveries covered by the Company's patent applications and may
have filed their applications prior to the Company's patent applications. The
Company does not expect to know for several years the relative strength of its
patent position as compared to these other groups.
 
    The enactment of the legislation implementing the General Agreement on
Tariffs and Trade has resulted in certain changes to United States patent laws
that became effective on June 8, 1995. Most notably, the term of patent
protection for patent applications filed on or after June 8, 1995 is no longer a
period of seventeen years from the date of grant. The new term of United States
patents will commence on the date of issuance and terminate twenty years from
the earliest effective filing date of the application. Because the time from
filing to issuance of patent applications is often more than three years, a
twenty-year term from the effective date of filing may result in a substantially
shortened term of patent protection, which may adversely impact the Company's
patent position.
 
    In addition to the patents, patent applications, licenses and intellectual
property processes described above, the Company also relies on unpatented
technology, trade secrets and information. No assurance can be given that others
will not independently develop substantially equivalent information and
techniques or otherwise gain access to the Company's technology or disclose such
technology, or that the
 
                                       39
<PAGE>
Company can meaningfully protect its rights in such unpatented technology, trade
secrets and information. The Company requires each of its employees, consultants
and advisors to execute a confidentiality agreement at the commencement of an
employment or consulting relationship with the Company. The agreements generally
provide that all inventions conceived by the individual in the course of
employment or in providing services to the Company and all confidential
information developed by, or made known to, the individual during the term of
the relationship shall be the exclusive property of the Company and shall be
kept confidential and not disclosed to third parties except in limited specified
circumstances. There can be no assurance, however, that these agreements will
provide meaningful protection for the Company's information in the event of
unauthorized use or disclosure of such confidential information.
 
GOVERNMENT REGULATION
 
    The Company and its products are subject to comprehensive regulation by the
FDA in the United States and by comparable authorities in other countries. These
national agencies and other federal, state, and local entities regulate, among
other things, the preclinical and clinical testing, safety, effectiveness,
approval, manufacture, labeling, marketing, export, storage, record keeping,
advertising, and promotion of the Company's products.
 
    FDA approval of the Company's products, including a review of the
manufacturing processes and facilities used to produce such products, will be
required before such products may be marketed in the United States. The process
of obtaining approvals from the FDA can be costly, time consuming, and subject
to unanticipated delays. There can be no assurance that approvals of the
Company's proposed products, processes, or facilities will be granted on a
timely basis, or at all. Any failure to obtain or delay in obtaining such
approvals would adversely affect the ability of the Company to market its
proposed products. Moreover, even if regulatory approval is granted, such
approval may include significant limitations on indicated uses for which a
product could be marketed.
 
    The process required by the FDA before the Company's products may be
approved for marketing in the United States generally involves (i) preclinical
laboratory and animal tests, (ii) submission to the FDA of an IND, which must
become effective before clinical trials may begin, (iii) adequate and
well-controlled human clinical trials to establish the safety and efficacy of
the drug for its intended indication, (iv) submission to the FDA of an NDA or
PLA and (v) FDA review of the NDA or PLA in order to determine, among other
things, whether the drug or product is safe and effective for its intended uses.
There is no assurance that the FDA review process will result in product
approval on a timely basis, or at all.
 
   
    An IND is a submission which the sponsor of a clinical trial of an
investigational new drug must make to the FDA, and which must become effective
before clinical trials may commence. The IND submission must include, among
other things, a description of the sponsor's investigational plan; protocols for
each planned study; chemistry, manufacturing, and control information;
pharmacology and toxicology information; and a summary of previous human
experience with the investigational drug.
    
 
   
    A NDA is an application to the FDA to market a new drug. The NDA must
contain, among other things, information on chemistry, manufacturing, and
controls; nonclinical pharmacology and toxicology; human pharmacokinetics and
bioavailability; and clinical data. The new drug may not be marketed in the
United States until the FDA has approved the NDA.
    
 
   
    A PLA is an application to the FDA to market a biological product. The PLA
must contain, among other things, data derived from nonclinical laboratory and
clinical studies which demonstrate that the product meets prescribed standards
of safety, purity and potency, and a full description of manufacturing methods.
The biological product may not be marketed in the United States until a product
license is issued, and until the establishment where the product is to be
manufactured has been issued an establishment license.
    
 
                                       40
<PAGE>
    Preclinical tests include laboratory evaluation of product chemistry and
animal studies to gain preliminary information of a product's pharmacology and
toxicology and to identify any safety problems that would preclude testing in
humans. Products must generally be manufactured according to cGMP and
preclinical safety tests must be conducted by laboratories that comply with FDA
regulations regarding good laboratory practices. The results of the preclinical
tests are submitted to the FDA as part of an IND application and are reviewed by
the FDA prior to the commencement of human clinical trials. Unless the FDA
objects to, or makes comments or raises questions concerning, an IND, the IND
will become effective 30 days following its receipt by the FDA and initial
clinical studies may begin, although companies often obtain affirmative FDA
approval before beginning such studies. There can be no assurance that
submission of an IND will result in FDA authorization to commence clinical
trials. See "Risk Factors-- Uncertainty Associated with Preclinical and Clinical
Testing."
 
    Clinical trials involve the administration of the investigational new drug
to healthy volunteers and to patients under the supervision of a qualified
principal investigator. Clinical trials must be conducted in accordance with the
FDA's Good Clinical Practice requirements under protocols that detail, among
other things, the objectives of the study, the parameters to be used to monitor
safety, and the effectiveness criteria to be evaluated. Each protocol must be
submitted to the FDA as part of the IND. Further, each clinical study must be
conducted under the auspices of an Institutional Review Board ("IRB"). The IRB
will consider, among other things, ethical factors, the safety of human
subjects, the possible liability of the institution and the informed consent
disclosure which must be made to participants in the clinical trial.
 
    Clinical trials are typically conducted in three sequential phases, although
the phases may overlap. During Phase I, when the drug is initially administered
to human subjects, the product is tested for safety, dosage tolerance,
absorption, metabolism, distribution, and excretion. Phase II involves studies
in a limited patient population to (i) evaluate preliminarily the efficacy of
the product for specific, targeted indications, (ii) determine dosage tolerance
and optimal dosage, and (iii) identify possible adverse effects and safety
risks. When a new product is found to have an effect and to have an acceptable
safety profile in Phase II evaluation, Phase III trials are undertaken in order
to further evaluate clinical efficacy and to further test for safety within an
expanded patient population. The FDA may suspend clinical trials at any point in
this process if it concludes that clinical subjects are being exposed to an
unacceptable health risk.
 
    The results of the preclinical studies and clinical studies, the chemistry
and manufacturing data, and the proposed labelling, among other things, are
submitted to the FDA in the form of an NDA or PLA, approval of which must be
obtained prior to commencement of commercial sales. The FDA may refuse to accept
the NDA or PLA for filing if certain administrative and content criteria are not
satisfied, and even after accepting the NDA or PLA for review, the FDA may
require additional testing or information before approval of the NDA or PLA. In
any event, the FDA must deny an NDA or PLA if applicable regulatory requirements
are not ultimately satisfied. Moreover, if regulatory approval of a product is
granted, such approval may be made subject to various conditions, including
post-marketing testing and surveillance to monitor the safety of the product, or
may entail limitations on the indicated uses for which it may be marketed.
Finally, product approvals may be withdrawn if compliance with regulatory
standards is not maintained or if problems occur following initial marketing.
 
    Under current FDA regulations, in addition to the licensing of a vaccine
product itself through the PLA process, any establishment used to manufacture a
vaccine product must also be licensed. To obtain the necessary establishment
license, an establishment license application ("ELA") describing the facilities,
equipment, processes, and personnel used to manufacture the product in question
must be filed with the FDA. The establishment license will be granted only after
the FDA inspects the establishment and determines that the establishment
complies with all applicable standards, including, but not limited to,
compliance with cGMP and the ability to consistently manufacture the product at
the establishment in accordance with the PLA. FDA approval of both the PLA and
ELA must be received prior to marketing of a vaccine product. Therefore, any
delay in FDA's approval of the ELA, or refusal to approve the ELA, would delay
or prevent the marketing of the product in question.
 
                                       41
<PAGE>
    On May 14, 1996, the FDA adopted a new regulation, effective May 24, 1996,
regarding the license application process for certain biological products. Those
biological products that fall within the regulation will be reviewed on the
basis of a single biologics license application ("BLA"), rather than a PLA/ELA.
The BLA includes the same information as the current PLA, but certain of the
data now required as part of the ELA do not have to be submitted or reviewed
during the approval process. This new rule is intended, at least in part, to
lessen the regulatory burden on manufacturers of certain biologics and
accelerate the approval process. There can be no assurance, however, that the
FDA will consider the new regulation applicable to any of the Company's
products, or that the BLA process, if applicable to the Company's products, will
have the intended effect of reducing review times.
 
    Both before and after approval is obtained, a product, its manufacturer, and
the holder of the NDA or PLA for the product are subject to comprehensive
regulatory oversight. Violations of regulatory requirements at any stage,
including the preclinical and clinical testing process, the approval process, or
thereafter (including after approval) may result in various adverse
consequences, including FDA delay in approving or refusal to approve a product,
withdrawal of an approved product from the market and/or the imposition of
criminal penalties against the manufacturer and/or NDA or PLA holder. In
addition, later discovery of previously unknown problems may result in
restrictions on such product, manufacturer, or NDA or PLA holder, including
withdrawal of the product from the market. Also, new government requirements may
be established that could delay or prevent regulatory approval of the Company's
products under development.
 
    The FDA has implemented accelerated approval procedures for certain
pharmaceutical agents that treat serious or life-threatening diseases and
conditions, and that provide meaningful therapeutic benefit over existing
treatments. The Company believes that certain of its products in development may
qualify for accelerated approval. The Company cannot predict the ultimate
impact, however, of the FDA's accelerated approval procedures on the timing or
likelihood of approval of any of its potential products or those of any
competitor. In addition, the approval of a product under the accelerated
approval procedures is subject to various conditions, including the requirement
to verify clinical benefit in postmarketing studies, and the authority on the
part of the FDA to withdraw approval under streamlined procedures if such
studies do not verify clinical benefit or under various other circumstances.
 
    Whether or not FDA approval has been obtained, approval of a pharmaceutical
product by comparable government regulatory authorities in foreign countries
must be obtained prior to marketing such product in such countries. The approval
procedure varies from country to country, and the time required may be longer or
shorter than that required for FDA approval. Although there are some procedures
for unified filing for certain European countries, in general, each country has
its own procedures and requirements. The Company does not currently have any
facilities or personnel outside of the United States.
 
    In addition to regulations enforced by the FDA, the Company also is subject
to regulation under the Occupational Safety and Health Act, the Environmental
Protection Act, the Toxic Substances Control Act, the Resource Conservation and
Recovery Act and other present and potential future federal, state or local
regulations. The Company's research and development involves the controlled use
of hazardous materials, chemicals, viruses and various radioactive compounds.
Although the Company believes that its safety procedures for storing, handling,
using and disposing of such materials comply with the standards prescribed by
applicable regulations, the risk of accidental contaminations or injury from
these materials cannot be completely eliminated. In the event of such an
accident, the Company could be held liable for any damages that result and any
such liability could have a material adverse effect of the Company. See "Risk
Factors --Government Regulation; No Assurance of Regulatory Approval" and
"--Hazardous Materials; Environmental Matters."
 
                                       42
<PAGE>
MANUFACTURING
 
    Progenics has considerable expertise in the manufacture of its proprietary
ganglioside conjugate vaccines and recombinant proteins. The Company currently
manufactures GMK, MGV, PRO 542 and PRO 367 in its pilot production facilities in
Tarrytown, New York. The Company believes that its existing production
facilities will be sufficient to meet the Company's initial needs for clinical
trials. However, these facilities may be insufficient for all of the Company's
late-stage clinical trials and for its commercial-scale requirements.
Accordingly, the Company expects to be required in the future to expand its
manufacturing staff and facilities and obtain new facilities or to contract with
third parties to assist with production. In general, Progenics plans to retain
manufacturing rights and control during clinical trials and commercialization.
In the event the Company decides to establish a full-scale commercial
manufacturing facility, the Company will require substantial additional funds
and will be required to hire and train significant numbers of employees and
comply with the extensive cGMP regulations applicable to such a facility. In
addition, if any of the Company's products produced at its facilities were
regulated as biologics, the Company could be required to file an ELA and obtain
an establishment license for its facilities.
 
SALES AND MARKETING
 
    Progenics plans to market products for which it obtains regulatory approval
through co-marketing, co-promotion, licensing and distribution arrangements with
third party collaborators. The Company believes that this approach will both
increase market penetration and commercial acceptance of its products and enable
the Company to avoid expending significant funds to develop a large sales and
marketing organization. The Company has entered into collaborative marketing
arrangements with DuPont and Intracel with respect to the sCD4 and gp120
research reagents.
 
COMPETITION
 
    Competition in the biopharmaceutical industry is intense. The Company faces
competition from many companies, major universities and research institutions in
the United States and abroad. Many of the Company's competitors have
substantially greater resources, experience in conducting preclinical studies
and clinical trials and obtaining regulatory approvals for their products,
operating experience, research and development and marketing capabilities and
production capabilities than those of the Company. The Company will face
competition from companies marketing existing products or developing new
products for diseases targeted by the Company's technologies. The development of
new products for those diseases for which the Company is developing products
could render the Company's product candidates noncompetitive and obsolete.
 
    A significant amount of research in this industry is also being carried out
at academic and government institutions. These institutions are becoming
increasingly aware of the commercial value of their findings and are becoming
more aggressive in pursuing patent protection and negotiating licensing
arrangements to collect royalties for use of technology that they have
developed. These institutions may also market competitive commercial products on
their own or in collaboration with competitors. Any resulting increase in the
cost or decrease in the availability of technology or product candidates from
these institutions may affect the Company's business strategy.
 
    Competition with respect to the Company's technologies and product
candidates is and will be based, among other things, on effectiveness, safety,
reliability, availability, price and patent position. Another important factor
will be the timing of market introduction of the Company's or competitive
products. Accordingly, the speed with which Progenics can develop products,
complete the clinical trials and approval processes and ultimately supply
commercial quantities of the products to the market is expected to be an
important competitive factor. The Company's competitive position will also
depend upon its
 
                                       43
<PAGE>
ability to attract and retain qualified personnel, to obtain patent protection
or otherwise develop proprietary products or processes, and to secure sufficient
capital resources for the often substantial period between technological
conception and commercial sales.
 
PRODUCT LIABILITY
 
    The testing, manufacturing and marketing of the Company's products involves
an inherent risk of product liability attributable to unwanted and potentially
serious health effects. To the extent the Company elects to test, manufacture or
market products independently, it will bear the risk of product liability
directly. If the Company enters into collaborative agreements with third parties
regarding commercialization of any products based on the Company's technologies,
the Company will seek to obtain indemnification agreements from such partners,
however there can be no assurance that corporate sponsors, if any, would agree
to fully indemnify the Company against losses resulting from such collaborative
efforts. The Company has obtained insurance in the amount of $5,000,000 against
the risk of product liability. This insurance is subject to certain deductibles
and coverage limitations. There is no guarantee that insurance will continue to
be available at a reasonable cost, or at all, or that the amount of such
insurance will be adequate.
 
HUMAN RESOURCES
    At September 30, 1996, the Company had 27 full-time employees, four of whom
hold Ph.D. degrees or foreign equivalents and two of whom hold M.D. degrees.
Twenty-one employees are engaged in research and development, medical and
regulatory affairs and manufacturing activities and six are engaged in finance,
administration and business development. The Company considers its relations
with its employees to be good. None of its employees is covered by a collective
bargaining agreement.
 
FACILITIES
 
    Progenics leases approximately 23,000 square feet of laboratory,
manufacturing and office space in Westchester County, New York, approximately
twenty-five miles north of New York City. The Company leases this space under an
operating lease which terminates in April 1998. Progenics has two pilot
production facilities within its leased facilities for the manufacture of
products for clinical trials.
 
LEGAL PROCEEDINGS
 
    The Company is not party to any material legal proceedings.
 
                                       44
<PAGE>
SCIENTIFIC ADVISORY BOARDS
 
    An important component of Progenics' scientific strategy is its
collaborative relationship with leading researchers in cancer and virology.
Certain of these researchers are members of the Company's two Scientific
Advisory Boards (each an "SAB"), one in cancer and one in virology. The members
of each SAB attend periodic meetings and provide Progenics with specific
expertise in both research and clinical development. In addition, Progenics has
collaborative research relationships with certain individual SAB members. All
members of the SABs are employed by employers other than the Company and may
have commitments to or consulting or advisory agreements with other entities
that may limit their availability to the Company. These companies may also be
competitors of Progenics. Several members of the SABs have, from time to time,
devoted significant time and energy to the affairs of the Company. However, no
member is regularly expected to devote more than a small portion of his time to
Progenics. In general, Progenics' scientific advisors are granted stock options
in the Company and receive financial remuneration for their services.
 
    CANCER SCIENTIFIC ADVISORY BOARD
 
<TABLE>
<CAPTION>
NAME                                                       POSITION/AFFILIATION
- ---------------------------------------------  ---------------------------------------------
<S>                                            <C>
Alan N. Houghton, M.D. (Chairman)............  Chairman, Immunology Program, Sloan-Kettering
                                               and Professor, Cornell University Medical
                                               College ("CUMC")
Angus G. Dalgleish, M.D., Ph.D...............  Chairman and Professor of Medical Oncology,
                                               St. George's Hospital, London
David W. Golde, M.D..........................  Physician-in-Chief, Sloan-Kettering and
                                               Professor, CUMC
David R. Klatzmann, M.D., Ph.D...............  Professor of Immunology, Pitie-Salpetriere
                                               Hospital, Paris
Philip O. Livingston, M.D....................  Associate Member, Sloan-Kettering and
                                               Associate Professor, CUMC
John Mendelsohn, M.D.........................  President, The University of Texas M.D.
                                               Anderson Cancer Center
David A. Scheinberg, M.D., Ph.D..............  Chief, Leukemia Service, Sloan-Kettering and
                                               Associate Professor, CUMC
</TABLE>
 
    VIROLOGY SCIENTIFIC ADVISORY BOARD
 
<TABLE>
<CAPTION>
NAME                                                       POSITION/AFFILIATION
- ---------------------------------------------  ---------------------------------------------
<S>                                            <C>
Stephen P. Goff, Ph.D. (Chairman)............  Professor of Biochemistry, Columbia
                                               University
Mark Alizon, M.D., Ph.D......................  Director of Research, Institut Cochin, Paris
Lawrence A. Chasin, Ph.D.....................  Professor of Biological Sciences, Columbia
                                               University
Leonard Chess, M.D...........................  Professor of Medicine, Columbia University
Wayne A. Hendrickson, Ph.D...................  Professor of Biochemistry, Columbia
                                               University
Israel Lowy, M.D., Ph.D......................  Assistant Professor of Medicine, Mount Sinai
                                               Medical Center
J. Steven McDougal, M.D......................  Chief, Immunology Branch, CDC, Atlanta
Luc Montagnier, M.D..........................  Professor and Chairman of Virology, Pasteur
                                               Institute, Paris
Sherie L. Morrison, Ph.D.....................  Professor of Microbiology, UCLA
Robin A. Weiss, Ph.D.........................  Professor and Director of Research, ICR,
                                               Royal Cancer Hospital, London
</TABLE>
 
                                       45
<PAGE>
                                   MANAGEMENT
 
DIRECTORS, EXECUTIVE OFFICERS AND KEY MANAGEMENT
 
    The directors, executive officers and key management of the Company are as
follows:
 
<TABLE>
<CAPTION>
NAME                                                       AGE                            POSITION
- -----------------------------------------------------      ---      -----------------------------------------------------
<S>                                                    <C>          <C>
 
Paul J. Maddon, M.D., Ph.D...........................          37   Chairman of the Board, Chief Executive Officer,
                                                                    President and Chief Science Officer
 
Robert J. Israel, M.D................................          39   Vice President, Medical Affairs
 
Robert A. McKinney...................................          40   Vice President, Finance and Operations and Treasurer
 
Joel D. Sendek.......................................          29   Senior Director, Corporate Development and Investor
                                                                    Relations
 
Graham P. Allaway, Ph.D..............................          41   Associate Scientific Director and Head, Therapeutic
                                                                    Development Group
 
Patricia C. Fazio....................................          37   Director, Health & Safety and Project Management
 
Charles A. Baker (1).................................          64   Director
 
Mark F. Dalton (1)...................................          46   Director
 
Stephen P. Goff, Ph.D. (2)...........................          45   Director
 
Elizabeth M. Greetham (2)............................          47   Director
 
Paul F. Jacobson (1).................................          42   Director
 
David A. Scheinberg, M.D., Ph.D. (2).................          40   Director
</TABLE>
 
- ------------------------------
 
(1) Member of Compensation Committee
 
(2) Member of Audit Committee
 
    PAUL J. MADDON, M.D., PH.D. is the founder of the Company and has served in
various capacities since its inception, including Chairman of the Board of
Directors, Chief Executive Officer, President and Chief Science Officer. From
1981 to 1988, Dr. Maddon performed research at the Howard Hughes Medical
Institute at Columbia University in the laboratory of Dr. Richard Axel. He
received a B.A. in biochemistry and mathematics and an M.D. and a Ph.D. in
biochemistry and molecular biophysics from Columbia University. Dr. Maddon has
been an Adjunct Assistant Professor of Medicine at Columbia University since
1989.
 
    ROBERT J. ISRAEL, M.D. joined the Company in October 1994 and has been Vice
President, Medical Affairs since that time. From 1991 to 1994, Dr. Israel was
Director, Clinical Research-Oncology and Immunohematology at Sandoz
Pharmaceuticals Corporation, a pharmaceutical company. From 1988 to 1991, he was
Associate Director, Oncology Clinical Research at Schering-Plough Corporation, a
pharmaceutical company. Dr. Israel is a licensed physician and is board
certified in both internal medicine and medical oncology. He received a B.A. in
physics from Rutgers University and an M.D. from the University of Pennsylvania
and completed an oncology fellowship at Sloan-Kettering. Dr. Israel has been a
consultant to the Solid Tumor Service at Sloan-Kettering since 1987.
 
                                       46
<PAGE>
    ROBERT A. MCKINNEY joined the Company in September 1992. Mr. McKinney served
as Director, Finance and Operations and Treasurer from 1992 to January 1993,
when he was appointed Vice President, Finance and Operations and Treasurer of
Progenics. From 1991 to 1992, he was Corporate Controller at VIMRx
Pharmaceuticals, Inc., a biotechnology research company. From 1990 to 1991, Mr.
McKinney was Manager, General Accounting at Micrognosis, Inc., a software
integration company. From 1985 to 1990, he was an audit supervisor at Coopers &
Lybrand L.L.P., an international accounting firm. Mr. McKinney studied finance
at the University of Michigan, received a B.B.A. in accounting from Western
Connecticut State University, and is a Certified Public Accountant.
 
    JOEL D. SENDEK joined the Company in July 1992. Mr. Sendek has served in
various management positions at Progenics, most recently as Senior Director,
Corporate Development and Investor Relations. From 1989 to 1992, he was an
investment banker in the health care group of the Corporate Finance Department
at Goldman, Sachs & Co., an international investment bank. Mr. Sendek received a
B.A. in biochemistry from Rice University.
 
    GRAHAM P. ALLAWAY, PH.D. joined the Company in July 1990. Dr. Allaway has
served in various management positions at Progenics, most recently as Associate
Scientific Director and Head, Therapeutic Development Group. From 1984 to 1990,
he was a Visiting Fellow and Visiting Associate at the NIH in the laboratory of
Dr. Abner Notkins. From 1982 to 1984, Dr. Allaway performed post-doctoral
research at Memorial University of Newfoundland, Canada. He received an M.A. in
zoology from Oxford University and a Ph.D. in virology from the University of
London. Dr. Allaway has been an Adjunct Associate Professor of Microbiology and
Immunology at New York Medical College since 1996.
 
    PATRICIA C. FAZIO joined the Company in August 1992. Ms. Fazio has served in
various management positions at Progenics, most recently as Director, Health &
Safety and Project Management. From 1987 to 1992, she was Senior Research
Technician and Laboratory Manager at the Howard Hughes Medical Institute at
Columbia University. From 1982 to 1987, Ms. Fazio was Chief Laboratory
Technologist in the Department of Pathology at Columbia Presbyterian Medical
Center. She received a B.A. in biology and chemistry at the College of New
Rochelle.
 
    CHARLES A. BAKER has been a Director of the Company since January 1994. Mr.
Baker has been the Chairman, President and Chief Executive Officer of The
Liposome Company, Inc., a biotechnology company located in Princeton, NJ, since
1989. Mr. Baker is currently a director of Regeneron Pharmaceuticals, Inc., a
biotechnology company. He serves on the Scientific Advisory Council of Rutgers
University and is a member of the Council of Visitors of the Marine Biological
Laboratory at Woods Hole, MA. Mr. Baker has more than 30 years of pharmaceutical
industry experience, and has held senior management positions at Pfizer, Abbott
Laboratories, Squibb Corporation, and A.L. Laboratories. Mr. Baker received a
B.A. from Swarthmore College and a J.D. from Columbia University.
 
    MARK F. DALTON has been a Director of the Company since July 1990. Mr.
Dalton has been the President, Chief Operating Officer and a director of Tudor
Investment Corporation, an investment advisory company, and its affiliates since
1988. From 1979 to 1988, he served in various senior management positions at
Kidder, Peabody & Co. Incorporated, including Chief Financial Officer. Mr.
Dalton is currently a director of several private companies in the U.S., Europe
and Asia. Mr. Dalton received a B.A. from Denison University and a J.D. from
Vanderbilt University.
 
    STEPHEN P. GOFF, PH.D. has been a Director of the Company since February
1993. Dr. Goff has been a member of the Virology Scientific Advisory Board since
1988 and has been its Chairman since April 1991. Dr. Goff has been the Higgins
Professor in the Departments of Biochemistry and Microbiology at Columbia
University since June 1990. He received an A.B. in biophysics from Amherst
College and a Ph.D. in biochemistry from Stanford University. Dr. Goff performed
post-doctoral research at the Massachusetts Institute of Technology in the
laboratory of Dr. David Baltimore.
 
                                       47
<PAGE>
    ELIZABETH M. GREETHAM has been a Director of the Company since January 1994.
Ms. Greetham has been the Portfolio Manager for Weiss, Peck & Greer ("WPG") Life
Sciences Fund, L.P. and WPG Institutional Life Sciences Fund, L.P. since 1992
and was a Health Care Analyst at WPG, L.L.C. from 1990 to 1992. Ms. Greetham is
also a director of Repligen Corporation and Guilford Pharmaceuticals, both of
which are biopharmaceutical companies, and ChiRex Inc. and Access
Pharmaceuticals, Inc., both of which are pharmaceutical companies. She received
an M.A. in Economics from Edinburgh University.
 
    PAUL F. JACOBSON has been a Director of the Company since July 1990. Mr.
Jacobson has been a Managing Director of fixed income securities at Deutsche
Bank since January 1996. He was President of Jacobson Capital Partners from 1993
to 1996. From 1986 to 1993, Mr. Jacobson was a partner at Goldman, Sachs, where
he was responsible for government securities trading activities. Mr. Jacobson
received a B.A. from Vanderbilt University and an M.B.A. from Washington
University.
 
    DAVID A. SCHEINBERG, M.D., PH.D. has been a Director of the Company since
May 1996 and a member of the Cancer Scientific Advisory Board since January
1994. Dr. Scheinberg has been associated with Sloan-Kettering since 1986, where
he has held the positions of Associate Professor (since 1994) and Chief (since
1992), Leukemia Service, Member of the Clinical Immunology Service (since 1987)
and Head, Laboratory of Hematopoietic Cancer Immunochemistry, Sloan-Kettering
Institute (since 1989). He also has held the position of Associate Professor of
Medicine and Molecular Pharmacology, Cornell University Medical College (since
1994). He received a B.A. from Cornell University, and an M.D. and a Ph.D. in
pharmacology and experimental therapeutics from The Johns Hopkins University.
 
    All directors hold office until the next annual meeting of stockholders and
until their successors have been elected and qualified. Officers are appointed
to serve, subject to the discretion of the Board of Directors, until their
successors are appointed. There are no family relationships among any of the
executive officers or directors of the Company.
 
COMMITTEES OF THE BOARD OF DIRECTORS
 
    The Board of Directors has a Compensation Committee, which makes
recommendations concerning salaries and incentive compensation for employees of
and consultants to the Company, establishes and approves salaries and incentive
compensation for certain senior officers and employees and administers and
grants stock options pursuant to the Company's stock option plans, and an Audit
Committee, which reviews the annual financial statements of the Company prior to
their submission to the Board of Directors, consults with the Company's
independent auditors, and examines and considers such other matters in relation
to the internal and external audit of the Company's account and in relation to
the financial affairs of the Company and its accounts, including the selection
and retention of independent auditors.
 
COMPENSATION OF DIRECTORS
 
    Directors do not receive compensation in their capacities as directors. All
of the directors are reimbursed for their expenses in connection with their
attendance at Board and committee meetings. In addition, Dr. Goff and Dr.
Scheinberg receive annual compensation in the amounts of $30,000 and $18,000,
respectively, for their services as members of the Company's Virology Scientific
Advisory Board and Cancer Scientific Advisory Board, respectively. See "Certain
Transactions."
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
    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. The members of the Compensation Committee are Charles A. Baker, Mark F.
Dalton and Paul F. Jacobson.
 
                                       48
<PAGE>
EXECUTIVE COMPENSATION
 
    SUMMARY COMPENSATION
 
    The following table sets forth certain information regarding compensation
paid and accrued during fiscal 1995 to the Company's Chief Executive Officer and
the other Executive Officers of the Company whose base compensation for fiscal
1996 equals or exceeds $100,000 (collectively, the "Named Executive Officers").
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                           ANNUAL COMPENSATION
                                                            --------------------------------------------------
 
<S>                                                         <C>        <C>         <C>           <C>
                                                                                                     OTHER
                                                                                                    ANNUAL
NAME AND PRINCIPAL POSITION                                   YEAR       SALARY       BONUS      COMPENSATION
- ----------------------------------------------------------  ---------  ----------  ------------  -------------
 
Paul J. Maddon, M.D., Ph.D................................       1996  $  165,000           (1)             (1)
  Chairman of the Board, Chief Executive Officer,                1995     150,000  $  20,000(2)    $   1,662(3)
  President and Chief Science Officer
 
Robert J. Israel, M.D.....................................       1996     175,000           (1)             (1)
  Vice President, Medical Affairs                                1995     165,000     17,500              --
 
Robert A. McKinney........................................  1996 1995     100,000           (1)             (1)
  Vice President, Finance and Operations and Treasurer                     80,641      7,000              --
</TABLE>
 
- ------------------------
 
(1) Bonuses and other annual compensation for fiscal 1996 have not yet been
    determined.
(2) In addition, Dr. Maddon was awarded a bonus of $35,000, the payment of which
    is contingent upon the Company's achievement of certain milestones.
(3) Represents the premium paid by the Company on a long-term disability policy.
 
    OPTION GRANTS
 
    The Company did not grant any options during fiscal 1995 to any of the Named
Executive Officers.
 
    OPTION EXERCISES AND FISCAL YEAR-END OPTION VALUES
 
    The following table sets forth certain information concerning the number and
value of unexercised options held by each of the Named Executive Officers on
December 31, 1995. No options were exercised by these individuals in fiscal
1995.
 
                         FISCAL YEAR-END OPTION VALUES
 
<TABLE>
<CAPTION>
                                                                 NUMBER OF SHARES          VALUE OF UNEXERCISED
                                                              UNDERLYING OPTIONS AT      IN-THE-MONEY OPTIONS AT
                                                                 FISCAL YEAR-END            FISCAL YEAR-END(1)
                                                            --------------------------  --------------------------
NAME                                                        EXERCISABLE  UNEXERCISABLE  EXERCISABLE  UNEXERCISABLE
- ----------------------------------------------------------  -----------  -------------  -----------  -------------
<S>                                                         <C>          <C>            <C>          <C>
 
Paul J. Maddon, M.D., Ph.D.(2)............................     225,000        525,000    $ 274,398    $   685,432
 
Robert J. Israel, M.D.(3).................................      11,250         45,000       15,075         60,300
 
Robert A. McKinney(3).....................................      28,500         24,000       75,540         57,060
</TABLE>
 
- ------------------------------
 
(1) The value of the unexercised, in-the-money options on December 31, 1995 is
    based on the difference between the fair market value per share of the
    Common Stock at such date as determined by the Board of Directors ($6.67),
    and the per share option exercise price, multiplied by the number of shares
    of Common Stock underlying the options.
 
(2) The exercisability of 150,000 of these options will be accelerated upon the
    effectiveness of this offering (assuming an initial public offering price of
    $12.00 per share) and the exercisibility of all of these options shall be
    accelerated in the event of a change in control of the Company.
 
(3) On May 15, 1996, additional options to purchase 18,750 shares of Common
    Stock were granted to Dr. Israel and additional options to purchase 15,000
    shares of Common Stock were granted to Mr. McKinney. These options have an
    exercise price of $6.67 per share and are not reflected in the above table.
 
                                       49
<PAGE>
    EMPLOYMENT AGREEMENTS
 
    Pursuant to the terms of the Employment Agreement (the "Employment
Agreement") dated December 15, 1993 between the Company and Dr. Maddon, the
Company has retained Dr. Maddon as Chairman of the Board, President, Chief
Executive Officer and Chief Science Officer of the Company at an annual salary
of $150,000. The Employment Agreement expires on December 15, 1998 but is
automatically renewed annually thereafter for up to five successive one-year
periods, unless either the Company or Dr. Maddon gives notice to the other party
of its or his intention not to renew at least 90 days before the end of the
initial term or any renewal term. Under the Employment Agreement, each year
following the closing of this offering, Dr. Maddon's salary then in effect shall
be increased at the rate of 10% per year, although the Board of Directors has
authority to grant additional compensation increases. In addition, Dr. Maddon
will be paid a bonus of not less than $15,000 per year. If Dr. Maddon's
employment is terminated without "cause" (as defined in the Employment
Agreement), he will be entitled to receive his annual salary for a period of two
years (but in no event after December 14, 1998) and any of the 750,000 options
granted to him under the 1993 Executive Stock Option Plan that have not
previously vested will vest. Dr. Maddon is also bound by certain non-competition
obligations.
 
    Pursuant to the terms of a letter dated August 25, 1994 between the Company
and Robert J. Israel, M.D., the Company has retained Dr. Israel as Vice
President of Medical Affairs of the Company at an annual salary of $165,000 per
year. In addition, the Company paid Dr. Israel a $10,000 bonus upon his hire.
Under the Letter Agreement, Dr. Israel is entitled to nine months salary if his
employment is terminated without cause.
 
STOCK OPTION PLANS
 
    The Company has historically maintained stock option plans as an integral
component of its compensation program for key employees, directors and
consultants. The Company believes that such plans provide long-term incentives
to such persons and encourage the ownership of the Company's Common Stock. In
May 1996, the Company adopted the 1996 Stock Incentive Plan (the "1996 Plan"),
which provides for the grant of stock options as well as other types of stock
and incentive awards. Outstanding stock options that were granted under the
Company's previous stock incentive plans will remain subject to the terms and
conditions of the plan pursuant to which they were originally granted. Stock
options and other awards granted following the offering will be pursuant to the
1996 Plan.
 
    1989 NON-QUALIFIED STOCK OPTION PLAN
 
   
    The Company's 1989 Non-Qualified Stock Option Plan (the "1989 Option Plan")
was adopted by the Company in April 1989. The 1989 Option Plan provided for the
grant of stock options to employees, consultants, directors of the Company and
other individuals who render services to the Company. Under the 1989 Option
Plan, the Company could grant options not intended to qualify as incentive stock
options within the meaning of Section 422A of the Internal Revenue Code of 1986,
as amended (the "Code"). A total of 375,000 shares of Common Stock were
originally authorized for issuance under the 1989 Option Plan. As of September
30, 1996 options to purchase 354,011 shares of Common Stock at exercise prices
ranging from $1.33 to $5.33 per share were outstanding under the 1989 Option
Plan, of which options to purchase 276,386 shares were exercisable. No options
have been exercised to date and options outstanding expire at various dates
through January 28, 2011.
    
 
    Payment of the option exercise price may be made in cash, shares of Common
Stock, a combination of cash or stock or by any other method. Options are not
assignable or transferable except by will or under the laws of descent and
distribution. For a period of ten years following the termination for any reason
of an optionee's employment or active involvement with the Company, as
determined by the Board of Directors, the Company has the right to repurchase
from the optionee any or all shares of Common Stock
 
                                       50
<PAGE>
held by the optionee and/or any or all of the vested but unexercised portion of
any option granted under the 1989 Option Plan at a purchase price defined
therein.
 
    The 1989 Option Plan terminated on April 1, 1994. However any options
granted prior to such termination shall continue in effect until such option is
exercised or expires in accordance with its terms and the terms of the 1989
Option Plan.
 
    1993 STOCK OPTION PLAN
 
   
    The Company's 1993 Stock Option Plan (the "1993 Option Plan") was adopted by
the Company in December 1993. The 1993 Option Plan provided for the grant of
stock options to key employees (including officers who may be members of the
Company's Board of Directors), directors who are not employees and other
individuals who render services of a special importance to the management,
operation or development of the Company. Under the 1993 Option Plan, the Company
could grant options intended to qualify as incentive stock options within the
meaning of Section 422 of the Code and options not intended to qualify as
incentive stock options. A total of 750,000 shares of Common Stock were
originally authorized for issuance under the 1993 Option Plan. As of September
30, 1996, options to purchase a total of 687,225 shares of Common Stock at
exercise prices ranging from $5.33 to $6.67 per share were outstanding under the
1993 Option Plan, of which options to purchase 185,166 shares were exercisable.
No options have been exercised to date and options outstanding expire at various
dates through December 31, 2005. The remaining 62,775 shares of Common Stock
available for grant under the 1993 Stock Option Plan (which includes certain
options that expired prior to September 30, 1996 and which became available for
regrant under the 1993 Stock Option Plan) will be granted to employees of the
Company, prior to the completion of this offering, at an option price equal to
the initial public offering price in this offering.
    
 
    Payment of the option exercise price may be made in cash, shares of Common
Stock, a combination of cash or stock or by any other method. Options are not
assignable or transferable except by will or under the laws of descent and
distribution and, in the case of nonqualified options, to a designated
transferee, subject to approval by the Compensation Committee. For a period of
ten years following the termination for any reason of an optionee's employment
or active involvement with the Company, as determined by the Board of Directors,
the Company shall have the right to repurchase from the optionee any or all
shares of Common Stock acquired under the 1993 Option Plan and held by the
optionee and/or any or all of the vested but unexercised portion of any option
granted under the 1993 Option Plan at a purchase price defined therein. In
addition, the Company has certain rights of first refusal with respect to
transfers of optionees' vested and unvested stock except in the case of a
registered public offering.
 
    Following this offering, no further shares will be available for grant under
the 1993 Option Plan and the Company does not anticipate that there will be any
further grants of options under the 1993 Option Plan. However, any option
outstanding under the 1993 Option Plan shall remain outstanding until such
option is exercised or expires in accordance with its terms and the terms of the
1993 Option Plan.
 
    1993 EXECUTIVE STOCK OPTION PLAN
 
   
    The Company's 1993 Executive Stock Option Plan (the "1993 Executive Option
Plan") was adopted by the Company in December 1993. The 1993 Executive Option
Plan provided for the grant of stock options to senior executive employees
(including officers who may be members of the Company's Board of Directors).
Under the 1993 Executive Option Plan, the Company may grant incentive stock
options or nonqualified options. A total of 750,000 shares of Common Stock were
originally authorized for issuance upon the exercise of options granted under
the 1993 Executive Option Plan. As of September 30, 1996, options to purchase a
total of 750,000 shares of Common Stock at exercise prices of $5.33 or $5.87 per
share were outstanding under the 1993 Executive Option Plan, of which options to
purchase 225,000 shares
    
 
                                       51
<PAGE>
   
were exercisable. No options have been exercised to date and options outstanding
expire at various dates through December 15, 2007.
    
 
    Payment of the option exercise price may be made in cash, shares of Common
Stock, a combination of cash or stock or by any other method. Options are not
assignable or transferable except by will or under the laws of descent and
distribution.
 
    No further shares are available for grant under the 1993 Executive Option
Plan and the Company does not anticipate that there will be any further grants
of options under the 1993 Executive Option Plan. However, any option outstanding
under the 1993 Executive Option Plan shall remain outstanding until such option
is exercised or expires in accordance with its terms and the terms of the 1993
Executive Option Plan.
 
    1996 STOCK INCENTIVE PLAN
 
    The 1996 Plan was adopted by the Company in May 1996. The 1996 Plan permits
the Compensation Committee of the Board of Directors to make awards to
employees, advisors and consultants of the Company and its subsidiaries. The
1996 Plan provides for grant of stock options, including both incentive stock
options and nonqualified options, as well as stock appreciation rights,
restricted stock, performance shares and phantom stock, as described below. All
awards under the 1996 Plan are nontransferable by the participant, except upon
the participant's death in accordance with his will or applicable law. To date
no awards of options have been made under the 1996 Plan.
 
    STOCK OPTIONS.  The 1996 Plan authorizes the grant of nonqualified stock
options to employees, consultants and advisors of the Company and its
subsidiaries. Incentive stock options may only be granted to employees of the
Company and its subsidiaries. The exercise price of a nonqualified stock option
may be determined by the Compensation Committee in its discretion. The exercise
price of an incentive stock option may not be less than the fair market value of
the Common Stock on the date of grant (110% of the fair market value in the case
of an incentive stock option granted to a stockholder owning in excess of 10% of
the Common Stock). The value of Common Stock (determined at the time of grant)
that may be subject to incentive stock options that become exercisable by any
one employee in any one year is limited by the Code to $100,000. The maximum
term of stock options granted under the 1996 Plan is 10 years from the date of
grant. The Compensation Committee shall determine the extent to which an option
shall become and/or remain exercisable in the event of the termination of
employment or service of a participant under certain circumstances, including
retirement, death or disability, subject to certain limitations for incentive
stock options. Under the 1996 Plan, the exercise price of an option is payable
by the participant in cash or, in the discretion of the Compensation Committee,
in Common Stock or a combination of cash and Common Stock.
 
    STOCK APPRECIATION RIGHTS.  A stock appreciation right may be granted in
connection with an option, either at the time of grant or at any time thereafter
during the term of the option. A stock appreciation right granted in connection
with an option entitles the holder, upon exercise, to surrender the related
option and receive a payment based on the difference between the exercise price
of the related option and the fair market value of the Company's Common Stock on
the date of exercise. A stock appreciation right granted in connection with an
option is exercisable only at such time or times as the related option is
exercisable and expires no later than the time when the related option expires.
A stock appreciation right also may be granted without relationship to an option
and will be exercisable as determined by the Compensation Committee, but in no
event after ten years from the date of grant. A stock appreciation right granted
without relationship to an option entitles the holder, upon exercise, to a
payment based on the difference between the base price assigned to the stock
appreciation right by the Compensation Committee on the date of grant and the
fair market value of the Company's Common Stock on the date of exercise. Payment
to the holder in connection with the exercise of a stock appreciation right may
be in cash or shares of Common Stock or in a combination of cash and shares.
 
                                       52
<PAGE>
    RESTRICTED STOCK AWARDS.  The Committee may award shares of Common Stock to
participants under the 1996 Plan, subject to such restrictions on transfer and
conditions of forfeiture as it deems appropriate. Such conditions may include
requirements as to the continued service of the participant with the Company,
the attainment of specified performance goals or any other conditions determined
by the Compensation Committee. Subject to the transfer restrictions and
forfeiture restrictions relating to the restricted stock award, the participant
will otherwise have the rights of a stockholder of the Company, including all
voting and dividend rights, during the period of restriction.
 
    PERFORMANCE AWARDS.  The Compensation Committee may grant performance awards
denominated in specified dollar units ("Performance Units") or in shares of
Common Stock ("Performance Shares"). Performance awards are payable upon the
achievement of performance goals established by the Compensation Committee at
the beginning of the performance period, which may not exceed ten years from the
date of grant. At the time of grant, the Compensation Committee establishes the
number of units or shares, the duration of the performance period, the
applicable performance goals and, in the case of performance units, the
potential payment or range of payments for the performance awards. At the end of
the performance period, the Compensation Committee determines the payment to be
made based on the extent to which the performance goals have been achieved. The
Compensation Committee may consider significant unforeseen events during the
performance period when making the final award. Payments may be made in cash or
shares of Common Stock or in a combination of cash and shares.
 
    PHANTOM STOCK.  An award of phantom stock gives the participant the right to
receive cash at the end of a fixed vesting period based on the value of a share
of Common Stock at that time. Phantom stock units are subject to such
restrictions and conditions to payment as the Compensation Committee determines
are appropriate. At the time of grant, the Compensation Committee determines, in
its sole discretion, the number of units and the vesting period of the units,
and it may also set a maximum value of a unit. If the participant remains
employed by the Company throughout the applicable vesting period, he is entitled
to receive payment of a cash amount for each phantom stock unit equal in value
to the fair market value of one share of Common Stock on the last day of the
vesting period, subject to any maximum value limitation.
 
    ADMINISTRATION.  The 1996 Plan shall be administered by the Compensation
Committee of the Board of Directors, or such other committee as may be appointed
by the Board. Subject to the limitations set forth in the 1996 Plan, the
Compensation Committee has the authority to determine the persons to whom awards
will be granted, the time at which awards will be granted, the number of shares,
units or other rights subject to each award, the exercise, base or purchase
price of an award (if any), the time or times at which the award will become
vested, exercisable or payable and the duration of the award. The Compensation
Committee may provide for the acceleration of the vesting or exercise period of
an award at any time prior to its termination or upon the occurrence of
specified events. With the consent of the affected participant, the Compensation
Committee has the authority to cancel and replace awards previously granted with
new options for the same or a different number of shares and having a higher or
lower exercise or base price, and may amend the terms of any outstanding awards
to provide for an exercise or base price that is higher or lower than the
current exercise or base price.
 
    RESERVATION OF SHARES.  The Company has authorized and reserved 750,000
shares of Common Stock for issuance under the 1996 Plan. The shares may be
unissued shares or treasury shares. If any shares of Common Stock that are the
subject of an award are not issued or transferred and cease to be issuable or
transferable for any reason, such shares will no longer be charged against such
maximum share limitation and may again be made subject to awards under the 1996
Plan. In the event of certain corporate reorganizations, recapitalizations, or
other specified corporate transactions affecting the Company or the Common
Stock, proportionate adjustments may be made to the number of shares available
for grant and to the number of shares and prices under outstanding awards made
before the event.
 
    TERM AND AMENDMENT.  The 1996 Plan has a term of 10 years, subject to
earlier termination or amendment by the Board of Directors. All awards granted
under the 1996 Plan prior to its termination
 
                                       53
<PAGE>
   
remain outstanding until exercised, paid or terminated in accordance with their
terms. The Board of Directors may amend the 1996 Plan at any time, except that
shareholder approval is required for certain amendments to the extent necessary
for purposes of Rule 16b-3 under the Securities Exchange Act of 1934, as amended
(the "Exchange Act").
    
 
    401(K) SAVINGS AND RETIREMENT PLAN
 
    In 1993 the Company adopted the provisions of the amended and restated
Progenics 401(k) Plan (the "401(k) Plan"), a tax-qualified plan covering all
eligible employees, as defined therein. Each eligible employee may elect to
reduce his or her current compensation by 15%, subject to the statutory limit (a
maximum of $9,500 in 1996) and have the amount of the reduction contributed to
the 401(k) Plan. The Company has agreed to match 25% of up to the first 8% of
compensation that eligible employees contribute to the 401(k) Plan. In addition,
the Company may also make a discretionary contribution, as defined in the 401(k)
Plan, each year on behalf of all participants who are non-highly compensated
employees, as defined therein. The Company made matching contributions in an
aggregate amount of approximately $12,000 to eligible employees under the 401(k)
Plan in 1995. No matching contributions were made in 1995 to any of the Named
Executive Officers.
 
                                       54
<PAGE>
                              CERTAIN TRANSACTIONS
 
   
    During 1995, the Company borrowed under a note an aggregate of $1,200,000
from certain affiliates of Tudor Investment Corporation, a shareholder of the
Company. The note provided for the accrual of interest at the rate of 10% per
annum, with interest and principal payable on demand. In December 1995, the
principal amount of the note plus accrued interest of approximately $24,000 were
exchanged for approximately 61,200 Series C Units. See "Principal Stockholders"
and "Description of Capital Stock."
    
 
    Since January 1, 1993, the Company has sold securities in the following
transactions with the following directors, officers, and stockholders who
beneficially own more than 5% of the outstanding Common Stock of the Company
("5% Stockholders"), and affiliates of such directors, officers and 5%
Stockholders.
 
   
<TABLE>
<CAPTION>
                                                                         SERIES B
                                                                      PREFERRED STOCK
                                                                        ISSUED UPON
                                                          SERIES B      EXERCISE OF      SERIES C       TOTAL
NAME                                                      UNITS(1)      WARRANTS(2)      UNITS(3)   CONSIDERATION
- -------------------------------------------------------  ----------  -----------------  ----------  -------------
<S>                                                      <C>         <C>                <C>         <C>
Entities affiliated with Tudor Investment
 Corporation(4)........................................     758,750         375,000        180,000  $   8,510,000
Entities affiliated with Weiss, Peck & Greer
 L.L.C.(5).............................................     125,000         125,000         20,000      1,525,000
Paul F. Jacobson(6)....................................      12,500          12,500          5,000        212,500
David A. Scheinberg, M.D., Ph.D.(7)....................          --              --          1,250         25,000
                                                         ----------        --------     ----------  -------------
Total..................................................     896,250         512,500        206,250  $  10,272,500
                                                         ----------        --------     ----------  -------------
                                                         ----------        --------     ----------  -------------
</TABLE>
    
 
- ------------------------------
 
   
(1) Each Series B Unit consisted of one share of Series B Preferred Stock and
    one warrant to purchase one share of Series B Preferred Stock ("Series B
    Warrant"). The purchase price per unit was $4.00. The sale of all the Series
    B Units occurred in 1993.
    
 
   
(2) Shares issued upon exercise of Series B Warrants for an exercise price of
    $5.00 per share. The issuance of shares of Series B Preferred Stock upon
    exercise of Series B Warrants occurred in 1994.
    
 
   
(3) Each Series C Unit consists of four shares of Series C Preferred Stock and
    one warrant to purchase one share of Series C Preferred Stock ("Series C
    Warrant"). The purchase price per unit was $20.00. The Series C Warrants
    remain outstanding. Except for 100,000 Series C Units sold during the fourth
    quarter of 1995, the Series C Units were sold in 1996.
    
 
   
(4) The 180,000 Series C Units includes approximately 61,200 units issued in
    exchange for the note plus accrued interest held by Tudor Investment
    Corporation described above. Mr. Dalton, a director of the Company, is
    associated with Tudor Investment Corporation. See "Management."
    
 
   
(5) Ms. Greetham, a director of the Company, is associated with Weiss, Peck &
    Greer. See "Management."
    
 
   
(6) Mr. Jacobson is a director of the Company. See "Management."
    
 
   
(7) Mr. Scheinberg is a director of the Company. See "Management."
    
 
    Various directors, officers, 5% Stockholders of the Company and affiliates
of such persons are entitled to certain registration rights with respect to
their securities of the Company. See "Shares Eligible for Future Sale."
 
    The Company believes that the transactions described above were entered into
on terms no less favorable to the Company than could be obtained from third
parties on an arm's length basis.
 
                                       55
<PAGE>
                             PRINCIPAL STOCKHOLDERS
 
    The following table sets forth the aggregate number of shares of Common
Stock beneficially owned as of September 30, 1996, assuming conversion of all
shares of the Company's Preferred Stock into an aggregate of 4,259,878 shares of
Common Stock upon the closing of this offering, by: (i) each person (or group of
affiliated persons) known by the Company to be a beneficial owner of more than
5% of the outstanding Common Stock of the Company; (ii) each director of the
Company; (iii) each of the Named Executive Officers; and (iv) all directors and
executive officers of the Company as a group.
 
<TABLE>
<CAPTION>
                                                                                                    PERCENTAGE OF
                                                                                                 SHARES BENEFICIALLY
                                                                            NUMBER OF SHARES        OWNED(1)(2)(3)
                                                                              BENEFICIALLY     ------------------------
                                                                                  OWNED          BEFORE        AFTER
NAME AND ADDRESS OF BENEFICIAL OWNER                                            (1)(2)(3)       OFFERING     OFFERING
- --------------------------------------------------------------------------  -----------------  -----------  -----------
<S>                                                                         <C>                <C>          <C>
Entities affiliated with Tudor Investment Corporation(4)(5)
  600 Steamboat Road
  Greenwich, CT 06830.....................................................       2,314,314           34.6%        26.6%
Paul J. Maddon, M.D., Ph.D.(6)
  777 Old Saw Mill River Road
  Tarrytown, NY 10591.....................................................       1,125,000           16.2%        12.6%
Paul Tudor Jones, II(4)(5)
  600 Steamboat Road
  Greenwich, CT 06830.....................................................         488,625            7.4%         5.7%
Charles A. Baker(7).......................................................          33,750              *            *
Mark F. Dalton(8).........................................................          51,000              *            *
Stephen P. Goff, Ph.D.(9).................................................          56,250              *            *
Elizabeth M. Greetham(10).................................................         262,500            4.0%         3.1%
Paul F. Jacobson(11)......................................................         189,039            2.9%         2.2%
David A. Scheinberg, M.D., Ph.D.(12)......................................          47,545              *            *
Robert J. Israel, M.D.(13)................................................          22,500              *            *
Robert A. McKinney(14)....................................................          36,000              *            *
All directors and executive officers as a group (9 persons)(15)...........       1,823,584           25.6%        20.0%
</TABLE>
 
- ------------------------
 
*   Less than 1%
 
(1) Except as indicated in the footnotes to this table and pursuant to
    applicable community property laws, each stockholder possesses sole voting
    and investment power with respect to the shares of Common Stock listed.
 
(2) The number of shares of Common Stock beneficially owned includes the shares
    issuable pursuant to stock options and warrants that may be exercised within
    60 days after September 30, 1996. Shares issuable pursuant to such options
    and warrants are deemed outstanding for computing the percentage of
    beneficial ownership of the person holding such options and warrants but are
    not deemed outstanding for computing the percentage of beneficial ownership
    of any other person. The number of shares of Common Stock outstanding after
    this offering includes the 2,000,000 shares of Common Stock being offered
    for sale by the Company in this offering. Share amounts of the Company's
    Preferred Stock convertible into Common Stock (all of which will be
    converted to Common Stock upon the closing of this offering) are stated on
    an as converted basis.
 
(3) Assumes no exercise of the Underwriters' over-allotment option. See
    "Underwriting."
 
(4) The number of shares owned by entities affiliated with Tudor Investment
    Corporation ("TIC") consists of 1,704,501 shares held of record by Tudor BVI
    Futures, Ltd., an international business company organized under the law of
    the British Virgin Islands ("Tudor BVI"), 88,251 shares of Common Stock
    issuable to Tudor BVI upon the exercise of currently exercisable warrants,
    287,813 shares held of record by TIC, 164,499 shares held of record by Tudor
    Arbitrage Partners L.P. ("TAP") and 41,125 shares of Common Stock issuable
    to TAP upon the exercise of currently exercisable warrants, 22,500 shares of
    record held by Tudor Proprietary Trading, L.L.C., a UK-based limited
    liability corporation ("TPT"), and 5,625 shares of Common Stock issuable to
    TPT upon the exercise of currently exercisable warrants. In addition,
    because TIC provides investment advisory services to Tudor BVI, it may be
    deemed to beneficially own the shares held by such entity. TIC disclaims
    beneficial ownership of such shares.
 
                                       56
<PAGE>
(5) The shares held by Mr. Jones consist of 461,625 shares held of record by Mr.
    Jones and 27,000 shares subject to stock options held by Mr. Jones
    exercisable within 60 days of the date of this table. In addition, Mr. Jones
    is the Chairman and principal stockholder of TIC, the Chairman and indirect
    principal equity owner of the general partner of TAP, and the Chairman and
    indirect principal equity owner of TPT. Mr. Jones may be deemed to
    beneficially own the shares beneficially owned, or deemed beneficially
    owned, by such entities. Mr. Jones disclaims beneficial ownership of such
    shares.
 
(6) Includes 225,000 shares subject to stock options held by Dr. Maddon
    exercisable within 60 days of the date of this table and an additional
    150,000 shares subject to stock options which will accelerate upon the
    effectiveness of this offering (assuming an initial public offering price of
    $12.00 per share).
 
(7) Includes 3,750 shares of Common Stock issuable to the Baker Family Limited
    Partnership ("BFLP") upon the exercise of currently exercisable warrants,
    15,000 shares owned by the BFLP, and 15,000 shares subject to stock options
    held by Mr. Baker exercisable within 60 days of the date of this table.
 
(8) Includes 34,500 shares held of record directly by Mr. Dalton and 16,500
    shares of record held by DF Partners, a family partnership of which Mr.
    Dalton is the managing general partner with a 5% interest. The remaining 95%
    interest is held by trusts for the benefit of Mr. Dalton's children. As to
    such 95% interest, Mr. Dalton disclaims beneficial interest. See "Management
    -- Directors, Executive Officers and Key Management."
 
(9) Includes 18,750 shares subject to stock options held by Dr. Goff exercisable
    within 60 days of the date of this table.
 
(10) Consists of 131,250 shares held of record by Weiss, Peck & Greer ("WPG")
    Life Sciences Fund, L.P. ("WPGLSF") and 9,375 shares of Common Stock
    issuable to WPGLSF upon the exercise of currently exercisable warrants and
    116,250 shares held of record by WPG Institutional Life Sciences Fund, L.P.
    ("WPGILSF") and 5,625 shares of Common Stock issuable to WPGILSF upon the
    exercise of currently exercisable warrants. Ms. Greetham, who is the
    Portfolio Manager for both WPGLSF and WPGILSF, disclaims beneficial
    ownership of all such shares except to the extent of her beneficial interest
    in WPGLSF.
 
(11) Includes 3,750 shares of Common Stock issuable to Mr. Jacobson upon the
    exercise of currently exercisable warrants and 27,000 shares subject to
    stock options held by Mr. Jacobson exercisable within 60 days of the date of
    this table.
 
(12) Includes 938 shares of Common Stock issuable to Dr. Scheinberg upon the
    exercise of currently exercisable warrants and 42,857 shares subject to
    stock options held by Dr. Scheinberg exercisable within 60 days of the date
    of this table.
 
(13) Consists of 22,500 shares subject to stock options held by Dr. Israel
    exercisable within 60 days of the date of this table.
 
(14) Consists of 36,000 shares subject to stock options held by Mr. McKinney
    exercisable within 60 days of the date of this table.
 
(15) Includes shares held by affiliated entities as set forth in the above
    table, 387,107 shares subject to stock options held by all officers and
    directors exercisable within 60 days of the date of this table, 150,000
    shares subject to stock options held by an officer and director which will
    accelerate upon the effectiveness of this offering (assuming an initial
    public offering price of $12.00 per share) and 23,438 shares issuable upon
    the exercise of currently exercisable warrants beneficially owned by certain
    directors.
 
                                       57
<PAGE>
                          DESCRIPTION OF CAPITAL STOCK
 
AUTHORIZED STOCK; ISSUED AND OUTSTANDING SHARES
 
    Upon the completion of this offering, the authorized capital stock of the
Company will consist of 40,000,000 shares of Common Stock, par value $.0013 per
share, and 20,000,000 shares of Preferred Stock, par value $.001 per share.
 
    In October 1996 the Board of Directors and shareholders of the Company
approved a three-for-four reverse stock split of the Company's Common Stock. All
information in this Prospectus has been adjusted to reflect the reverse stock
split.
 
   
    As of September 30, 1996, 2,294,675 shares of Common Stock and 5,679,826
shares of Preferred Stock were outstanding. Simultaneously with the closing of
this offering, each outstanding share of Preferred Stock will automatically be
converted into .75 shares of Common Stock, or an aggregate of 4,259,878 shares
of Common Stock, pursuant to its terms.
    
 
COMMON STOCK
 
    Assuming conversion of all outstanding Preferred Stock, at September 30,
1996 there were 6,554,553 shares of Common Stock outstanding held by
approximately 130 stockholders of record. Holders of Common Stock are entitled
to one vote for each share held of record on any matters voted upon by
stockholders and do not have any cumulative voting rights. Subject to
preferences that may be applicable to any outstanding Preferred Stock, holders
of Common Stock are entitled to receive ratably such dividends as may be
declared 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, holders of Common Stock are entitled to share ratably in all assets
remaining after payment of liabilities and the liquidation preferences of any
outstanding Preferred Stock. Holders of Common Stock have no preemptive rights
and no right to convert their Common Stock into any other securities. There are
no redemption or sinking fund provisions applicable to the Common Stock. All
outstanding shares of Common Stock are, and all shares of Common Stock to be
outstanding upon completion of this offering will be, validly issued, fully paid
and nonassessable. All shares of Common Stock issuable upon conversion of the
Preferred Stock and upon exercise of warrants will be, upon such conversion or
exercise, validly issued, fully paid and nonassessable. The rights, preferences
and privileges of holders of Common Stock are subject to, and may be adversely
affected by, the rights of the holders of shares of any series of Preferred
Stock which the Company may designate and issue in the future.
 
PREFERRED STOCK
 
    Upon the closing of this offering, the conversion of the outstanding Series
A, Series B and Series C Preferred Stock and the filing of a Certificate of
Amendment to Certificate of Incorporation removing the designation of those
Series, the Company's Certificate of Incorporation will authorize the issuance
of up to 20,000,000 shares of Preferred Stock, $.001 par value per share, and
none of those shares will be outstanding or designated into any series. Under
the terms of the Certificate of Incorporation, the Board of Directors is
authorized, subject to any limitations prescribed by law, without stockholder
approval, to issue such shares of Preferred Stock in one or more series. Each
such series of Preferred Stock shall have such rights, preferences, privileges
and restrictions, including voting rights, dividend rights, conversion rights,
redemption privileges and liquidation preferences, as shall be determined by the
Board of Directors.
 
    The purpose of authorizing the Board of Directors to issue Preferred Stock
and determine its rights and preferences is to eliminate delays associated with
a stockholder vote on specific issuances. 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, or of discouraging a third party from acquiring, a
majority of the outstanding voting stock of the Company. The Company has no
present plans to issue any shares of Preferred Stock.
 
                                       58
<PAGE>
WARRANTS
 
    The Company has issued warrants (the "Warrants") to purchase 347,249 shares
of Series C Preferred Stock. Each Warrant entitles the holder to purchase one
share of Series C Preferred Stock at a purchase price of $5.00 per share
(subject to adjustment in certain circumstances) during the five-year period
commencing on the warrant issuance date (December 8, 1995 or February 23, 1996).
Following the closing of this offering, the Warrants will become exercisable for
260,455 shares of Common Stock at a purchase price of $6.67 per share of Common
Stock (subject to adjustment in certain circumstances). If at any time after the
date of this offering but before December 31, 1996 the Company issues: (i)
additional shares of Common Stock; (ii) securities that are convertible into or
exchangeable for shares of Common Stock; or (iii) warrants or other rights to
subscribe for shares of Common Stock (collectively, "Additional Shares"), at a
price lower than the current exercise price of the Warrant, then the exercise
price of the Warrant will be reduced to such lower price and the number of
shares subject to the Warrant shall be proportionally increased. After December
31, 1996, if the Company issues Additional Shares at a price per share that is
lower than the then current market price (as defined) per share of the Common
Stock, then the exercise price of the Warrant will be reduced to a price equal
to (a) the sum of (i) the total number of shares of the Company outstanding
immediately prior to the issuance of the Additional Shares multiplied by the
then current exercise price of the Warrant, plus (ii) the consideration received
by the Company for the Additional Shares, divided by (b) the total number of
shares of capital stock of the Company outstanding immediately after the
issuance of the Additional Shares. In such case the number of shares subject to
the Warrant shall be proportionally increased. In no event is any adjustment of
the exercise price of the Warrant or the number of shares subject to the Warrant
required upon the grant of stock options or other stock incentives to employees
of the Company or upon the exercise of such options or incentives.
 
DELAWARE LAW AND CERTAIN CHARTER AND BY-LAW PROVISIONS
 
    The Company is subject to the provisions of Section 203 of the General
Corporation Law of Delaware. Section 203 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 of the transaction in
which the person became an interested stockholder, unless the business
combination is approved in a prescribed manner. A "business combination"
includes mergers, asset sales and other transactions resulting in a financial
benefit to the interested stockholder. Subject to certain exceptions, an
"interested stockholder" is a person who, together with affiliates and
associates, owns, or within three years did own, 15% or more of a corporation's
voting stock.
 
    The Certificate of Incorporation contains certain provisions permitted under
the General Corporation Law of Delaware relating to the liability of directors.
The provisions eliminate a director's liability for monetary damages for a
breach of fiduciary duty, except in certain circumstances involving wrongful
acts, such as the breach of a director's duty of loyalty or acts or omissions
which involve intentional misconduct or a knowing violation of law. Further, the
Certificate of Incorporation contains provisions to indemnify the Company's
directors and officers to the fullest extent permitted by the General
Corporation Law of Delaware. The Company believes that these provisions will
assist the Company in attracting and retaining qualified individuals to serve as
directors.
 
TRANSFER AGENT AND REGISTRAR
 
    The transfer agent and registrar for the Common Stock is American Stock
Transfer & Trust Company.
 
                                       59
<PAGE>
   
                        SHARES ELIGIBLE FOR FUTURE SALE
    
 
    Upon completion of this offering, based upon the number of shares
outstanding at September 30, 1996, there will be 8,554,553 shares of Common
Stock of the Company outstanding (exclusive of 947,007 shares covered by vested
options and warrants outstanding at September 30, 1996 and including 4,259,878
shares of Common Stock to be issued upon the automatic conversion of the
outstanding shares of Preferred Stock upon consummation of this offering). Of
these outstanding shares (and without taking into account the lock-up agreements
described below), approximately 4,504,095 shares, including the 2,000,000 shares
of Common Stock sold in this offering, will be immediately eligible for resale
in the public market without restriction under the Securities Act, except that
any shares purchased in this offering by "affiliates" of the Company, as that
term is defined in Rule 144 under the Securities Act ("Affiliates"), may
generally only be resold in compliance with applicable provisions of Rule 144.
Beginning approximately 90 days after the date of this Prospectus (and without
taking into account the lock-up agreements described below), approximately
2,963,711 additional shares of Common Stock and approximately 779,486 shares
covered by options exercisable within the 90-day period following the date of
this Prospectus will become eligible for immediate resale in the public market,
subject to compliance as to certain of such shares with applicable provisions of
Rules 144 and 701.
 
    The Company, the executive officers and directors of the Company, and
certain securityholders, which executive officers, directors and securityholders
in the aggregate hold approximately 8,353,912 shares of Common Stock and shares
issuable upon the exercise of outstanding options and warrants (including
946,098 shares of Common Stock that may be acquired pursuant to the exercise of
vested options or warrants held by them) at September 30, 1996, have agreed
pursuant to certain agreements that they will not, without the prior written
consent of Oppenheimer & Co., Inc., offer, sell or otherwise dispose of the
shares of Common Stock beneficially owned by them for a period of 180 days from
the date of this Prospectus (120 days with respect to 45,000 of such shares).
The shares subject to the lock-up agreements include 2,189,897 of the shares of
Common Stock that would otherwise have become immediately eligible for resale in
the public market upon completion of this offering and approximately 2,963,711
of the shares of Common Stock and 778,577 of the shares covered by options
exercisable within the 90-day period following the date of this Prospectus that
would otherwise have become eligible for resale in the public market beginning
approximately 90 days after the date of this Prospectus, subject to compliance
as to certain of such shares with the applicable provisions of Rules 144 and
701.
 
    In general, under Rule 144 as currently in effect, beginning approximately
90 days after the effective date of the Registration Statement of which this
Prospectus is a part, a stockholder, including an Affiliate, who has
beneficially owned his or her restricted securities (as that term is defined in
Rule 144) for at least two years from the later of the date such securities were
acquired from the Company or (if applicable) the date they were acquired from an
Affiliate is entitled to sell, within any three-month period, a number of such
shares that does not exceed the greater of 1% of the then outstanding shares of
Common Stock (approximately 85,546 shares immediately after this offering) or
the average weekly trading volume in the Common Stock during the four calendar
weeks preceding the date on which notice of such sale was filed under Rule 144,
provided certain requirements concerning availability of public information,
manner of sale and notice of sale are satisfied. In addition, under Rule 144(k),
if a period of at least three years has elapsed between the later of the date
restricted securities were acquired from the Company or (if applicable) the date
they were acquired from an Affiliate of the Company, a stockholder who is not an
Affiliate of the Company at the time of sale and has not been an Affiliate of
the Company for at least three months prior to the sale is entitled to sell the
shares immediately without compliance with the foregoing requirements under Rule
144. The Commission has proposed an amendment to Rule 144 which would reduce the
holding period required for shares subject to Rule 144 to become eligible for
sale in the public market from two years to one year, and from three years to
two years in the case of Rule 144(k).
 
                                       60
<PAGE>
    Rule 701 under the Securities Act provides an exemption from the
registration requirements of the Securities Act for offers and sales of
securities issued pursuant to certain compensatory benefit plans, such as the
Company's stock option and stock incentive plans, of a company not subject to
the reporting requirements of Section 13 or 15(d) of the Exchange Act.
Securities issued pursuant to Rule 701 are defined as restricted securities for
purposes of Rule 144. However, 90 days after the issuer becomes subject to the
reporting provisions of the Exchange Act, the Rule 144 resale restrictions,
except for the broker's transaction requirement, are inapplicable for
non-affiliates. Affiliates are subject to all Rule 144 restrictions after this
90-day period, but without a holding period. In addition, the Company plans to
file a Form S-8 registration statement registering shares of stock issuable
pursuant to the Company's stock option plans.
 
    Commencing on the first anniversary of the date of this Prospectus, all of
the stockholders of the Company who purchased shares prior to this offering will
be entitled to certain rights with respect to the registration under the
Securities Act of a total of approximately 6,815,000 shares of Common Stock (the
"Registrable Shares"), including 260,455 shares of Common Stock that may be
acquired pursuant to the exercise of outstanding warrants, under the terms of
agreements with the Company (the "Registration Agreements"). The holders of 20%
of the Registrable Shares (the "Minimum Number of Holders") may trigger the
obligation of the Company to use its best efforts to effect no more than two
public offerings on Forms S-1 or S-2, provided that the offering price per share
is at least $6.67 and the aggregate offering price to the public is at least $5
million. In addition, the Minimum Number of Holders shall have the right to
demand an unlimited number of registrations on Form S-3, provided that the
aggregate proposed public offering price of the securities to be included in
such registration shall be at least $1 million. In addition, if the Company
files a registration statement with the Commission, stockholders may elect to
include therein their respective Registrable Shares. There is no limit with
respect to the number of times holders of Registrable Shares may exercise such
"piggyback" registration rights. In addition, pursuant to the Employment
Agreement between the Company and Dr. Maddon, the Company granted to Dr. Maddon
separate "piggyback" registration rights which may be exercised at any time with
respect to his shares of Common Stock or shares of Common Stock issuable upon
exercise of any options (as of September 30, 1996, Dr. Maddon held options to
purchase 750,000 shares of Common Stock, of which options to purchase 225,000
shares of Common Stock were exercisable on that date or within 60 days
thereafter). Aquila also has been granted "piggyback" registration rights with
respect to the registration of shares of the Company's securities held by it,
which rights may be exercised at any time. The Company's obligation to register
shares pursuant to exercise of any of the foregoing "demand" or "piggyback"
registration rights is subject in any underwritten offering to the right of the
underwriters to exclude shares necessary to avoid interfering with the
successful marketing of the underwritten offering. The Company is generally
obligated to bear the expenses, other than underwriting discounts and
commissions, of all of these registrations.
 
    Prior to this offering, there has been no public market for the Common
Stock. No precise prediction can be made as to the effect, if any, that market
sales of shares or the availability of shares for sale will have on the market
price of the Common Stock prevailing from time to time. The Company is unable to
estimate the number of shares that may be sold in the public market pursuant to
Rule 144, since this will depend on the market price of the Common Stock, the
personal circumstances of the sellers and other factors. Nevertheless, sales of
significant amounts of the Common Stock of the Company in the public market
could adversely affect the market price of the Company's Common Stock and could
impair the Company's ability to raise capital through an offering of its equity
securities.
 
                                       61
<PAGE>
                                  UNDERWRITING
 
    Subject to the terms and conditions of the Underwriting Agreement, the
Company has agreed to sell to each of the Underwriters named below, and each of
the Underwriters, for whom Oppenheimer & Co., Inc. and Vector Securities
International, Inc. are acting as Representatives, has severally agreed to
purchase from the Company, the respective number of shares of Common Stock set
forth opposite the name of each Underwriter below.
 
<TABLE>
<CAPTION>
                                                                                     NUMBER
NAME                                                                               OF SHARES
- ---------------------------------------------------------------------------------  ----------
<S>                                                                                <C>
Oppenheimer & Co., Inc...........................................................
Vector Securities International, Inc.............................................
 
                                                                                   ----------
 
      Total......................................................................   2,000,000
                                                                                   ----------
                                                                                   ----------
</TABLE>
 
    The Underwriters propose to offer the shares of Common Stock directly to the
public at the initial public offering price set forth on the cover page of this
Prospectus and in part to certain securities dealers at such price less a
concession of $       per share. The Underwriters may allow, and such dealers
may reallow, a concession not in excess of $       per share to certain other
brokers and dealers. After the shares of Common Stock are released for sale to
the public, the offering price and other selling terms may, from time to time,
be varied by the Representatives. The Underwriters are obligated to take and pay
for all of the shares of Common Stock offered hereby (other than those covered
by the over-allotment option described below), if any are taken.
 
    The Company has granted to the Underwriters an option, exercisable for up to
30 days after the date of this Prospectus, to purchase up to an aggregate of
300,000 additional shares of Common Stock to cover over-allotments, if any. If
the Underwriters exercise such option, the Underwriters have severally agreed,
subject to certain conditions, to purchase approximately the same percentage
thereof that the number of shares to be purchased by each of them bears to the
2,000,000 shares of Common Stock offered hereby. The Underwriters may exercise
such option only to cover over-allotments made in connection with the sale of
the shares of Common Stock offered hereby. The Representatives have advised the
Company that the Underwriters do not intend to confirm sales in excess of 5% of
the shares offered hereby to any account over which they exercise discretionary
authority.
 
    The Company has agreed to indemnify the Representatives of the Underwriters
and the several Underwriters against certain liabilities, including, without
limitation, liabilities under the Securities Act.
 
    The Company's officers and directors and certain stockholders who own an
aggregate of 8,353,912 shares of Common Stock (including shares issuable upon
exercise of outstanding options and warrants) have agreed that they will not
directly or indirectly, sell, offer, contract to sell, make a short sale, pledge
or otherwise dispose of any shares of Common Stock (or any securities
convertible into or exchangeable or exercisable for any other rights to purchase
or acquire Common Stock other than shares of Common Stock issuable upon exercise
of outstanding options) owned by them, for a period of 180 days after the date
of this Prospectus (120 days with respect to one stockholder who owns 45,000
shares of Common Stock), without the prior written consent of Oppenheimer & Co.,
Inc., subject to certain limited exceptions. The
 
                                       62
<PAGE>
Company has also agreed not to issue, sell or register with the Commission for
its own account or otherwise dispose of, directly or indirectly, any equity
securities of the Company (or any securities convertible into or exercisable or
exchangeable for equity securities of the Company) for a period of 180 days
after the date of this Prospectus, without the prior written consent of
Oppenheimer & Co., Inc., subject to certain limited exceptions.
 
    Prior to this offering, there has been no public market for the Common
Stock. The initial public offering price will be negotiated between the Company
and the Representatives. Among the factors to be 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, capital
structure, estimates of the business potential and earnings prospects of the
Company, an assessment of the Company's management and consideration of the
above factors in relation to market values of companies in related businesses.
 
                                       63
<PAGE>
                                 LEGAL MATTERS
 
    The validity of the Common Stock being offered hereby will be passed upon
for the Company by Dewey Ballantine, 1301 Avenue of the Americas, New York, New
York 10019, and for the Underwriters by Hale and Dorr, 60 State Street, Boston,
Massachusetts 02109.
 
                                    EXPERTS
 
    The balance sheets as of December 31, 1994, 1995 and September 30, 1996 and
the statements of operations, stockholders' equity (deficit) and cash flows for
each of the three years in the period ended December 31, 1995, for the nine
months ended September 30, 1996 and for the period from December 1, 1986
(inception) to September 30, 1996, included in this Prospectus, have been
included herein in reliance on the report of Coopers & Lybrand L.L.P.,
independent accountants, given on the authority of that firm as experts in
accounting and auditing.
 
                             ADDITIONAL INFORMATION
 
    The Company has filed with the Commission a Registration Statement on Form
S-1 under the Securities Act with respect to the Common Stock offered hereby.
This Prospectus does not contain all of the information set forth in the
Registration Statement and the exhibits and the schedules thereto. For further
information with respect to the Company and such Common Stock, reference is made
to the Registration Statement and exhibits and schedules thereto. Statements
contained in this Prospectus as to the contents of any contract or other
document referred to are not necessarily complete, and, with respect to any
contract or other document filed as an exhibit to the Registration Statement,
each such statement is qualified in all respects by reference to such exhibit.
Copies of the Registration Statement and the exhibits thereto are on file at the
offices of the Commission and may be obtained upon payment of the prescribed fee
or may be examined without charge at the Commission's Public Reference Section,
Room 1024, 450 Fifth Street, N.W., Washington D.C. 20549, as well as at the
Commission's Regional Offices at Seven World Trade Center, New York, New York
10048, and Northwestern Atrium Center, 500 West Madison Street, Suite 1400,
Chicago, Illinois 60661-2511. Copies of such material can be obtained in person
from the Public Reference Section of the Commission at its principal office
located at 450 Fifth Avenue, N.W., Washington, D.C. 20549, upon payment of the
prescribed fees. In addition, the Company is required to file electronic
versions of these documents with the Commission through the Commission's
Electronic Data Gathering, Analysis and Retrieval (EDGAR) system. The Commission
maintains a World Wide Web site at http://www.sec.gov that contains reports,
proxy and information statements and other information regarding registrants
that file electronically with the Commission.
 
    Upon completion of the offering, the Company will be subject to the
reporting requirements of the Exchange Act and in accordance therewith will file
annual and quarterly reports, proxy statements and other information with the
Commission. Such reports, proxy statements and other information may be
inspected, and copies of such material may be obtained upon payment of the
prescribed fees, at the Commission's Public Reference Section at the addresses
set forth above.
 
                                       64
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                                                PAGE
                                                                                                                -----
<S>                                                                                                          <C>
 
Report of Independent Accountants..........................................................................         F-2
 
Financial Statements:
 
  Balance Sheets as of December 31, 1994 and 1995 and September 30, 1996...................................         F-3
 
  Statements of Operations for the years ended December 31, 1993, 1994 and 1995, for the nine months ended
    September 30, 1995 (unaudited) and 1996 and for the period from December 1, 1986 (inception) to
    September 30, 1996.....................................................................................         F-4
 
  Statements of Stockholders' Equity (Deficit) for the period from December 1, 1986 (inception) to
    September 30, 1996, including the years ended December 31, 1993, 1994 and 1995 and the nine months
    ended September 30, 1996...............................................................................         F-5
 
  Statements of Cash Flows for the years ended December 31, 1993, 1994 and 1995, for the nine months ended
    September 30, 1995 (unaudited) and 1996 and for the period from December 1, 1986 (inception) to
    September 30, 1996.....................................................................................         F-7
 
  Notes to Financial Statements............................................................................         F-8
</TABLE>
 
                                      F-1
<PAGE>
REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Board of Directors and Stockholders of
Progenics Pharmaceuticals, Inc.:
 
    We have audited the accompanying balance sheets of PROGENICS
PHARMACEUTICALS, INC. (the "Company") (a development stage enterprise) as of
December 31, 1994 and 1995 and September 30, 1996, and the related statements of
operations, stockholders' equity (deficit) and cash flows for each of the three
years in the period ended December 31, 1995, for the nine months ended September
30, 1996 and for the period from December 1, 1986 (inception) to September 30,
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 audits.
 
    We conducted our audits 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 audits provide a reasonable basis for our opinion.
 
    In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of the Company as of December
31, 1994 and 1995 and September 30, 1996, and the results of its operations and
its cash flows for each of the three years in the period ended December 31,
1995, for the nine months ended September 30, 1996 and for the period from
December 1, 1986 (inception) to September 30, 1996, in conformity with generally
accepted accounting principles.
 
                                          COOPERS & LYBRAND L.L.P.
 
New York, New York
October 28, 1996.
 
                                      F-2
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                                 BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                                                            DECEMBER 31,
                                                                   ------------------------------  SEPTEMBER 30,
                                                                        1994            1995            1996
                                                                   --------------  --------------  --------------
<S>                                                                <C>             <C>             <C>
ASSETS:
Current assets:
  Cash and cash equivalents......................................  $    2,275,236  $      559,294  $    1,745,776
  Certificates of deposit........................................         103,850              --              --
  Grant revenue receivable.......................................              --         112,749          79,638
  Other current assets...........................................          67,967          18,445          60,370
                                                                   --------------  --------------  --------------
      Total current assets.......................................       2,447,053         690,488       1,885,784
Fixed assets, at cost, net of accumulated depreciation and
  amortization...................................................         959,136         966,118         890,391
Security deposits and other assets...............................          83,284          79,118          64,636
                                                                   --------------  --------------  --------------
      Total assets...............................................  $    3,489,473  $    1,735,724  $    2,840,811
                                                                   --------------  --------------  --------------
                                                                   --------------  --------------  --------------
LIABILITIES AND STOCKHOLDERS' EQUITY:
Current liabilities:
  Accounts payable and accrued expenses..........................  $      209,341  $      487,089  $      874,628
  Capital lease obligations, current portion.....................         218,494         184,344         117,092
                                                                   --------------  --------------  --------------
      Total current liabilities..................................         427,835         671,433         991,720
Capital lease obligations........................................         204,916         162,824         154,687
Deferred lease liability.........................................          29,782          49,740          26,420
                                                                   --------------  --------------  --------------
      Total liabilities..........................................         662,533         883,997       1,172,827
                                                                   --------------  --------------  --------------
Commitments and contingencies
Stockholders' equity:
  Preferred stock, $.001 par value; 20,000,000 shares authorized:
    Series A Preferred Stock, convertible; 4,000,000 shares
      designated; shares issued and outstanding--
      2,308,000 in 1994, 1995 and 1996 (liquidation value,
      $6,055,750)................................................           2,308           2,308           2,308
    Series B Preferred Stock, convertible; 2,500,000 shares
      designated; shares issued and outstanding-- 1,982,830 in
      1994, 1995 and 1996 (liquidation value, $8,650,630)........           1,983           1,983           1,983
    Series C Preferred Stock, convertible; 3,750,000 shares
      designated; shares issued and outstanding--424,184 in 1995
      and 1,388,996 in 1996 (liquidation value, $2,120,920 in
      1995 and $6,944,980 in 1996)...............................              --             424           1,389
                                                                   --------------  --------------  --------------
      Total preferred stock......................................           4,291           4,715           5,680
  Common Stock, $.0013 par value; 40,000,000 shares authorized;
    shares issued and outstanding--2,249,675 in 1994 and
    2,294,675 in 1995 and 1996...................................           2,924           2,983           2,983
  Additional paid-in capital.....................................      15,974,008      18,501,808      22,798,674
  Deficit accumulated during the development stage...............     (13,154,283)    (17,657,779)    (21,139,353)
                                                                   --------------  --------------  --------------
      Total stockholders' equity.................................       2,826,940         851,727       1,667,984
                                                                   --------------  --------------  --------------
      Total liabilities and stockholders' equity.................  $    3,489,473  $    1,735,724  $    2,840,811
                                                                   --------------  --------------  --------------
                                                                   --------------  --------------  --------------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements.
 
                                      F-3
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                            STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                                            NINE MONTHS ENDED      DECEMBER 1, 1986
                                           YEARS ENDED DECEMBER 31,           SEPTEMBER 30,          (INCEPTION)
                                      ----------------------------------  ----------------------       THROUGH
                                         1993        1994        1995        1995        1996     SEPTEMBER 30, 1996
                                      ----------  ----------  ----------  ----------  ----------  ------------------
<S>                                   <C>         <C>         <C>         <C>         <C>         <C>
                                                                          (UNAUDITED)
 
Revenues:
  Research grants...................  $   84,000  $  503,518  $  725,348  $  502,109  $  267,606     $  1,735,152
  Product sales.....................      49,715      51,971      49,752      40,252      67,422          358,335
  Interest income...................      53,500     108,036      46,378      43,663      91,300          632,719
                                      ----------  ----------  ----------  ----------  ----------  ------------------
      Total revenues................     187,215     663,525     821,478     586,024     426,328        2,726,206
                                      ----------  ----------  ----------  ----------  ----------  ------------------
Expenses:
  Research and development..........   1,546,965   2,858,547   3,853,001   2,584,997   2,654,460       15,504,947
  General and administrative........     747,425     877,906   1,093,821     790,185     984,191        6,257,002
  Interest expense..................      38,071      50,399      87,279      52,347      39,564          440,717
  Depreciation and amortization.....     249,371     288,407     290,873     229,135     229,687        1,662,893
                                      ----------  ----------  ----------  ----------  ----------  ------------------
      Total expenses................   2,581,832   4,075,259   5,324,974   3,656,664   3,907,902       23,865,559
                                      ----------  ----------  ----------  ----------  ----------  ------------------
      Net loss......................  $(2,394,617) $(3,411,734) $(4,503,496) $(3,070,640) $(3,481,574)    $(21,139,353)
                                      ----------  ----------  ----------  ----------  ----------  ------------------
                                      ----------  ----------  ----------  ----------  ----------  ------------------
Pro forma net loss per share data:
  Pro forma net loss per share
    (unaudited).....................                              $(0.73)                 $(0.57)
                                                              ----------              ----------
                                                              ----------              ----------
  Pro forma weighted average common
    shares outstanding
    (unaudited).....................                           6,134,721               6,134,721
</TABLE>
 
    The accompanying notes are an integral part of the financial statements.
 
                                      F-4
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
 
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                  STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT)
 
    FOR THE PERIOD FROM DECEMBER 1, 1986 (INCEPTION) TO SEPTEMBER 30, 1996,
 
           INCLUDING THE YEARS ENDED DECEMBER 31, 1993, 1994 AND 1995
 
                  AND THE NINE MONTHS ENDED SEPTEMBER 30, 1996
 
<TABLE>
<CAPTION>
                                                                                                         DEFICIT
                                                                                                       ACCUMULATED
                                             PREFERRED STOCK           COMMON STOCK       ADDITIONAL    DURING THE
                                          ----------------------  ----------------------    PAID-IN    DEVELOPMENT
                                            SHARES      AMOUNT      SHARES      AMOUNT      CAPITAL       STAGE        TOTAL
                                          ----------  ----------  ----------  ----------  -----------  ------------  ----------
<S>                                       <C>         <C>         <C>         <C>         <C>          <C>           <C>
Sale of Common Stock for cash ($.0013
  per share)............................                           4,875,000  $    6,338  $       162                $    6,500
Sale of Common Stock for cash ($.13 per
  share)................................                             180,000         234       23,766                    24,000
Net loss for the year ended November 30,
  1987..................................                                                               $    (33,642)    (33,642)
                                                                  ----------  ----------  -----------  ------------  ----------
    Balance at November 30, 1987........                           5,055,000       6,572       23,928       (33,642)     (3,142)
Sale of Common Stock during May 1988 to
  an employee/stockholder for cash of
  $150 and services at estimated value
  ($1.07 per share).....................                             112,500         146      120,004                   120,150
Sale of Common Stock for cash ($1.07 per
  share)................................                           1,026,574       1,335    1,093,665                 1,095,000
Conversion of note payable to
  stockholder...........................                                                       27,500                    27,500
Purchase of treasury stock during June
  for cash of $20,000 and issuance of a
  note payable ($.53 per share).........                             (75,000)        (98)     (39,902)                  (40,000)
Sale of Common Stock during November in
  consideration for services rendered at
  estimated value ($1.33 per share).....                               2,476           3        3,297                     3,300
Net loss for the year ended November 30,
  1988..................................                                                                   (461,879)   (461,879)
                                                                  ----------  ----------  -----------  ------------  ----------
    Balance at November 30, 1988........                           6,121,550       7,958    1,228,492      (495,521)    740,929
Sale of Series A Preferred Stock units
  for cash ($2.50 per unit).............   1,037,000  $    1,037                            2,591,463                 2,592,500
Net loss for the year ended November 30,
  1989..................................                                                                 (1,151,167) (1,151,167)
                                          ----------  ----------  ----------  ----------  -----------  ------------  ----------
    Balance at November 30, 1989........   1,037,000       1,037   6,121,550       7,958    3,819,955    (1,646,688)  2,182,262
Purchase of treasury stock during
  February for cash of $231,328 and
  issuance of a note payable (average
  $.08 per share).......................                          (3,825,000)     (4,973)    (297,884)                 (302,857)
Sale of Series A Preferred Stock units
  for cash ($2.50 per unit).............     128,000         128                              319,872                   320,000
Net loss for the year ended November 30,
  1990..................................                                                                 (1,709,728) (1,709,728)
                                          ----------  ----------  ----------  ----------  -----------  ------------  ----------
    Balance at November 30, 1990........   1,165,000       1,165   2,296,550       2,985    3,841,943    (3,356,416)    489,677
Purchase of treasury stock for cash
  ($.0016 per share)....................                             (46,875)        (61)         (14)                      (75)
Exercise of Series A Preferred Stock
  warrants for cash ($2.75 per share)...   1,143,000       1,143                            3,142,107                 3,143,250
Net loss for the year ended November 30,
  1991..................................                                                                 (1,673,439) (1,673,439)
                                          ----------  ----------  ----------  ----------  -----------  ------------  ----------
    Balance at November 30, 1991........   2,308,000       2,308   2,249,675       2,924    6,984,036    (5,029,855)  1,959,413
Net loss for the one-month period ended
  December 31, 1991.....................                                                                    (95,675)    (95,675)
                                          ----------  ----------  ----------  ----------  -----------  ------------  ----------
    Balance at December 31, 1991........   2,308,000       2,308   2,249,675       2,924    6,984,036    (5,125,530)  1,863,738
</TABLE>
 
                                      F-5
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
 
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
            STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) (CONTINUED)
 
<TABLE>
<CAPTION>
                                                                                                         DEFICIT
                                                                                                       ACCUMULATED
                                             PREFERRED STOCK           COMMON STOCK       ADDITIONAL    DURING THE
                                          ----------------------  ----------------------    PAID-IN    DEVELOPMENT
                                            SHARES      AMOUNT      SHARES      AMOUNT      CAPITAL       STAGE        TOTAL
                                          ----------  ----------  ----------  ----------  -----------  ------------  ----------
<S>                                       <C>         <C>         <C>         <C>         <C>          <C>           <C>
Sale of Series B Preferred Stock units
  for cash, net of expenses ($4.00 per
  unit).................................     428,750  $      429                          $ 1,714,271                $1,714,700
Compensation expense in connection with
  the issuance of stock options.........                                                      190,926                   190,926
Net loss for the year ended December 31,
  1992..................................                                                               $ (2,222,402) (2,222,402)
                                          ----------  ----------  ----------  ----------  -----------  ------------  ----------
    Balance at December 31, 1992........   2,736,750       2,737   2,249,675  $    2,924    8,889,233    (7,347,932)  1,546,962
Sale of Series B Preferred Stock units
  for cash, net of expenses ($4.00 per
  unit).................................     834,770         835                            3,333,245                 3,334,080
Compensation expense in connection with
  the issuance of stock options.........                                                       36,637                    36,637
Net loss for the year ended December 31,
  1993..................................                                                                 (2,394,617) (2,394,617)
                                          ----------  ----------  ----------  ----------  -----------  ------------  ----------
    Balance at December 31, 1993........   3,571,520       3,572   2,249,675       2,924   12,259,115    (9,742,549)  2,523,062
Exercise of Series B Preferred Stock
  warrants for cash ($5.00 per share)...     719,310         719                            3,595,831                 3,596,550
Compensation expense in connection with
  the issuance of stock options.........                                                      119,062                   119,062
Net loss for the year ended December 31,
  1994..................................                                                                 (3,411,734) (3,411,734)
                                          ----------  ----------  ----------  ----------  -----------  ------------  ----------
    Balance at December 31, 1994........   4,290,830       4,291   2,249,675       2,924   15,974,008   (13,154,283)  2,826,940
Sale of Series C Preferred Stock units
  for cash ($20.00 per unit)............     179,450         179                              897,070                   897,249
Compensation expense in connection with
  the issuance of stock options.........                                                      107,363                   107,363
Conversion of note payable and accrued
  interest of $23,671 into Series C
  Preferred Stock units ($20.00 per
  unit).................................     244,734         245                            1,223,426                 1,223,671
Issuance of Common Stock in
  consideration for obtaining a license
  and supply agreement at estimated
  value ($6.67 per share)...............                              45,000          59      299,941                   300,000
Net loss for the year ended December 31,
  1995..................................                                                                 (4,503,496) (4,503,496)
                                          ----------  ----------  ----------  ----------  -----------  ------------  ----------
    Balance at December 31, 1995........   4,715,014       4,715   2,294,675       2,983   18,501,808   (17,657,779)    851,727
Sale of Series C Preferred Stock units
  for cash, net of expenses ($20.00 per
  unit).................................     964,812         965                            4,776,359                 4,777,324
Compensation expense in connection with
  the issuance of stock options.........                                                       98,523                    98,523
Deferred equity issuance costs..........                                                     (578,016)                 (578,016)
Net loss for the nine months ended
  September 30, 1996....................                                                                 (3,481,574) (3,481,574)
                                          ----------  ----------  ----------  ----------  -----------  ------------  ----------
    Balance at September 30, 1996.......   5,679,826  $    5,680   2,294,675  $    2,983  $22,798,674  $(21,139,353) $1,667,984
                                          ----------  ----------  ----------  ----------  -----------  ------------  ----------
                                          ----------  ----------  ----------  ----------  -----------  ------------  ----------
</TABLE>
 
    Securities issued for non-cash consideration were valued based upon the
Board of Directors' estimate of fair value of the securities issued at the time
the services were rendered.
 
    The accompanying notes are an integral part of the financial statements.
 
                                      F-6
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                            STATEMENTS OF CASH FLOWS
 
                INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS
<TABLE>
<CAPTION>
                                                                                                             NINE MONTHS
                                                                                                                ENDED
                                                                                                              SEPTEMBER
                                                                           YEARS ENDED DECEMBER 31,              30,
                                                                   ----------------------------------------  ------------
                                                                       1993          1994          1995          1995
                                                                   ------------  ------------  ------------  ------------
<S>                                                                <C>           <C>           <C>           <C>
                                                                                                             (UNAUDITED)
Cash flows from operating activities:
  Net loss during development stage..............................  $ (2,394,617) $ (3,411,734) $ (4,503,496) $ (3,070,640)
  Adjustments to reconcile net loss to net cash used in operating
    activities:
      Depreciation and amortization..............................       249,371       288,407       290,873       229,135
      Compensation expense recognized in connection with issuance
        of stock options.........................................        36,637       119,062       107,363        80,522
      Loss on disposal of fixed assets...........................            --            --            --            --
      Noncash operating expenses.................................            --            --            --            --
      Common stock issued in consideration for operating
        expenses.................................................            --            --       323,671            --
      Changes in assets and liabilities:
        (Increase) decrease in grant revenue receivable..........            --            --      (112,749)           --
        (Increase) decrease in other current assets..............        (5,100)      (62,867)       49,522        50,765
        (Increase) decrease in security deposits and other
          assets.................................................       (21,782)       (2,663)       (5,834)       (4,428)
        Increase (decrease) in accounts payable and accrued
          expenses...............................................        18,615        69,165       273,399       159,102
        (Decrease) increase in deferred lease liability..........       (19,646)       18,323        24,307        18,230
                                                                   ------------  ------------  ------------  ------------
          Net cash used in
            operating activities.................................    (2,136,522)   (2,982,307)   (3,552,944)   (2,537,314)
                                                                   ------------  ------------  ------------  ------------
Cash flows from investing activities:
  Proceeds on sale of fixed assets...............................            --            --            --            --
  Capital expenditures...........................................      (229,710)     (323,426)     (158,445)     (114,408)
  Redemption of certificates of deposit..........................            --        10,000       113,850       113,850
  Purchase of certificates of deposit............................            --       (10,000)           --            --
  Other..........................................................            --            --            --            --
                                                                   ------------  ------------  ------------  ------------
          Net cash used in
            investing activities.................................      (229,710)     (323,426)      (44,595)         (558)
                                                                   ------------  ------------  ------------  ------------
Cash flows from financing activities:
  Proceeds from issuance of equity securities, less offering
    expenses.....................................................     3,334,080     3,596,550       897,249            --
  Payment of deferred equity issuance costs......................            --            --            --            --
  Payment of capital lease obligations...........................      (107,895)     (132,414)     (215,652)     (166,281)
  Proceeds from notes payable....................................            --            --     1,200,000       800,000
  Repayments of notes payable....................................       (73,923)      (20,638)           --            --
  Borrowings from stockholder....................................            --            --            --            --
  Repayment of borrowings from stockholder.......................            --            --            --            --
  Payments to acquire treasury shares............................            --            --            --            --
                                                                   ------------  ------------  ------------  ------------
          Net cash provided by (used in) financing activities....     3,152,262     3,443,498     1,881,597       633,719
                                                                   ------------  ------------  ------------  ------------
          Net increase (decrease) in cash and cash equivalents...       786,030       137,765    (1,715,942)   (1,904,153)
Cash and cash equivalents at beginning of period.................     1,351,441     2,137,471     2,275,236     2,275,236
                                                                   ------------  ------------  ------------  ------------
          Cash and cash equivalents at end of period.............  $  2,137,471  $  2,275,236  $    559,294  $    371,083
                                                                   ------------  ------------  ------------  ------------
                                                                   ------------  ------------  ------------  ------------
Supplemental disclosure of cash flow information:
    Cash paid for interest.......................................  $     38,071  $     47,618  $     90,060  $     55,128
                                                                   ------------  ------------  ------------  ------------
                                                                   ------------  ------------  ------------  ------------





<PAGE>
 
<CAPTION>
 
                                                                                  DECEMBER 1, 1986
                                                                                    (INCEPTION)
                                                                                      THROUGH
                                                                       1996      SEPTEMBER 30, 1996
                                                                   ------------  ------------------
<S>                                                                <C>           <C>
 
Cash flows from operating activities:
  Net loss during development stage..............................  $ (3,481,574)   $  (21,139,353)
  Adjustments to reconcile net loss to net cash used in operating
    activities:
      Depreciation and amortization..............................       229,687         1,662,893
      Compensation expense recognized in connection with issuance
        of stock options.........................................        98,523           552,511
      Loss on disposal of fixed assets...........................            --            17,550
      Noncash operating expenses.................................            --            51,766
      Common stock issued in consideration for operating
        expenses.................................................            --           446,971
      Changes in assets and liabilities:
        (Increase) decrease in grant revenue receivable..........        33,111           (79,638)
        (Increase) decrease in other current assets..............       (41,925)          (60,370)
        (Increase) decrease in security deposits and other
          assets.................................................        14,482           (64,636)
        Increase (decrease) in accounts payable and accrued
          expenses...............................................      (137,545)          345,195
        (Decrease) increase in deferred lease liability..........        (3,262)           50,827
                                                                   ------------  ------------------
          Net cash used in
            operating activities.................................    (3,288,503)      (18,216,284)
                                                                   ------------  ------------------
Cash flows from investing activities:
  Proceeds on sale of fixed assets...............................            --            22,500
  Capital expenditures...........................................       (73,303)       (1,336,287)
  Redemption of certificates of deposit..........................            --           182,850
  Purchase of certificates of deposit............................            --          (182,850)
  Other..........................................................            --           (29,326)
                                                                   ------------  ------------------
          Net cash used in
            investing activities.................................       (73,303)       (1,343,113)
                                                                   ------------  ------------------
Cash flows from financing activities:
  Proceeds from issuance of equity securities, less offering
    expenses.....................................................     4,777,324        21,501,303
  Payment of deferred equity issuance costs......................       (72,990)          (72,990)
  Payment of capital lease obligations...........................      (156,046)         (892,113)
  Proceeds from notes payable....................................            --         1,277,500
  Repayments of notes payable....................................            --          (257,124)
  Borrowings from stockholder....................................            --           200,000
  Repayment of borrowings from stockholder.......................            --          (200,000)
  Payments to acquire treasury shares............................            --          (251,403)
                                                                   ------------  ------------------
          Net cash provided by (used in) financing activities....     4,548,288        21,305,173
                                                                   ------------  ------------------
          Net increase (decrease) in cash and cash equivalents...     1,186,482         1,745,776
Cash and cash equivalents at beginning of period.................       559,294                --
                                                                   ------------  ------------------
          Cash and cash equivalents at end of period.............  $  1,745,776    $    1,745,776
                                                                   ------------  ------------------
                                                                   ------------  ------------------
Supplemental disclosure of cash flow information:
    Cash paid for interest.......................................  $     39,564    $      440,717
                                                                   ------------  ------------------
                                                                   ------------  ------------------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements.
 
                                      F-7
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                         NOTES TO FINANCIAL STATEMENTS
 
                        (1995 INTERIM DATA IS UNAUDITED)
 
1. ORGANIZATION AND BUSINESS
 
    Progenics Pharmaceuticals, Inc. (the "Company") is a biopharmaceutical
company focusing on the development and commercialization of innovative products
for the treatment and prevention of cancer and viral diseases, including human
immunodeficiency virus ("HIV") infection. The Company was incorporated in
Delaware on December 1, 1986. The Company has no products approved by the U.S.
Food and Drug Administration and as a development stage enterprise, the
Company's primary efforts to date have been devoted to research and development,
raising capital, acquiring equipment, setting up laboratories, and clinical
testing of product candidates. In addition to the normal risks associated with a
new business venture, there can be no assurance that the Company's research and
development will be successfully completed, that any products developed will
obtain necessary government regulatory approval or that any approved products
will be commercially viable. In addition, the Company operates in an environment
of rapid change in technology and is dependent upon the continued services of
its current employees, consultants and subcontractors.
 
    The Company has sustained net losses and negative cash flows from operations
since its inception and expects these conditions to continue for the foreseeable
future. The Company has received assurances from a stockholder that it will
provide the financing necessary to enable the Company to continue to operate
through February 28, 1998 if alternative financing, as defined, such as an
initial public offering, is not obtained. The Company will need to raise
additional financing through public or private equity financings, collaborative
or other arrangements with corporate sources, or other sources of financing to
fund operations after February 28, 1998. There can be no assurance that such
additional financing, if at all available, can be obtained on terms reasonable
to the Company. In the event the Company is unable to raise additional capital,
operations after February 28, 1998 will need to be scaled back or discontinued.
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
PRODUCT SALES
 
    The Company has derived all of its product revenue from the sale of research
reagents to primarily one customer. Product sales revenue is recognized at the
time reagents are shipped. The reagents are products of the Company's research
and development efforts. The Company maintains no inventory of reagent and cost
of product sales is not material.
 
RESEARCH GRANTS
 
   
    The Company has been awarded government research grants from two grantors
("Grantors"). The respective grants are used to subsidize the Company's research
projects ("Projects") regarding HIV. Grant revenue is recognized on a pro rata
basis as the underlying costs of the Project are incurred. This method
approximates the straight-line basis over the lives of the Projects. Receivables
from the Grantors represent a concentration of credit risk to the Company. For
each of the three years in the period ended December 31, 1995 and the nine
months ended September 30, 1996, all of the Company's research grant revenue
came from the Grantors. In general, the grants provide the Company with
substantially all the rights regarding any technology (the "Technology")
developed as the result of the sponsored research except that the Grantor has
the right to use the Technology on a royalty-free basis and the Grantor may
require the Company to license the Technology to others, as defined. In
addition, the Company may be required to manufacture any product using the
Technology in the United States. Amounts paid to the Company are nonrefundable
and the Company is not contractually obligated to deliver any product or result
from its research.
    
 
                                      F-8
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
                        (1995 INTERIM DATA IS UNAUDITED)
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
FIXED ASSETS
 
   
    Leasehold improvements, furniture and fixtures, and equipment are stated at
cost. Furniture, fixtures, and equipment are depreciated on a straight-line
basis over their estimated useful lives. Leasehold improvements are amortized on
a straight-line basis over the life of the lease or of the improvement,
whichever is shorter. The estimated useful lives of fixed assets are as follows:
    
 
   
<TABLE>
<CAPTION>
<S>                                                             <C>
Computer equipment............................................  5 years
Machinery and equipment.......................................  5-7 years
Furniture and fixtures........................................  5 years
                                                                Life of
Leasehold improvements........................................  lease
</TABLE>
    
 
PATENTS
 
    As a result of research and development efforts conducted by the Company, it
has applied, or is applying, for a number of patents to protect proprietary
inventions. All costs associated with patents are expensed as incurred.
 
CASH AND CASH EQUIVALENTS
 
    The Company considers all highly liquid investments which have maturities of
three months or less, when acquired, to be cash equivalents. The carrying amount
reported in the balance sheet for cash and cash equivalents approximates its
fair value. Cash, cash equivalents and certificates of deposit, subject the
Company to concentrations of credit risk. At September 30, 1996, the Company had
invested approximately $1,569,000 in funds with a major investment company and
held approximately $177,000 in a single commercial bank. At December 31, 1995,
the Company had invested approximately $33,000 in funds with a major investment
company and held approximately $526,000 in a single commercial bank. At December
31, 1994, the Company had invested approximately $2,100,000 in funds and three
month certificates of deposit with a major investment company and held
approximately $267,000, including certificates of deposit totaling approximately
$114,000, in a single commercial bank.
 
NET LOSS PER SHARE
 
PRO FORMA PER SHARE DATA (UNAUDITED)
 
   
    The pro forma per share data included in the Statements of Operations has
been computed using the weighted average number of shares of common stock
outstanding. Common stock issuable upon the exercise of outstanding stock
options and warrants are excluded from the computation as their effect is
anti-dilutive, except that, pursuant to Securities and Exchange Commission Staff
Accounting Bulletin
No. 83 ("SAB No. 83"), equity securities, including options and warrants, issued
at prices below the assumed public offering price of $12.00 during the 12-month
period prior to the proposed offering have been included in the calculation as
if they were outstanding for all periods presented. In addition, the weighted
average number of shares of convertible preferred stock that will convert
automatically into shares of common stock upon the closing of the Company's
proposed initial public offering has been included in the calculation from their
original date of issuance.
    
 
                                      F-9
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
                        (1995 INTERIM DATA IS UNAUDITED)
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
   
PER SHARE DATA IN ACCORDANCE WITH SAB NO. 83
    
 
   
    The per share data found below has been computed in accordance with
Accounting Principles Board Opinion No. 15 ("APB No. 15") adjusted for SAB No.
83. Such computation is based on the net loss for the period divided by the
weighted average number of shares outstanding excluding the number of common
shares issuable upon the exercise of outstanding options and warrants and the
conversion of preferred stock since such inclusion would be anti-dilutive,
except that, pursuant to SAB
No. 83, equity securities including options and warrants, issued at prices below
the assumed public offering price of $12.00 during the 12 month period prior to
the proposed offering have been included in the calculation as if outstanding
for all periods presented.
    
 
   
<TABLE>
<CAPTION>
                                                                                              NINE MONTHS
                                                    YEARS ENDED DECEMBER 31,              ENDED SEPTEMBER 30,
                                            -----------------------------------------  --------------------------
                                                1993          1994           1995          1995          1996
                                            ------------  -------------  ------------  ------------  ------------
<S>                                         <C>           <C>            <C>           <C>           <C>
                                                                                       (UNAUDITED)
Net loss per share:
  Per APB No. 15..........................  $      (1.06) $       (1.52) $      (1.99) $      (1.36) $      (1.52)
  Effect of SAB No. 83....................          0.24           0.35          0.45          0.31          0.33
                                            ------------  -------------  ------------  ------------  ------------
    Per SAB No. 83........................  $      (0.82) $       (1.17) $      (1.54) $      (1.05) $      (1.19)
                                            ------------  -------------  ------------  ------------  ------------
                                            ------------  -------------  ------------  ------------  ------------
Shares used in calculating per share
  amounts:
  Per APB No. 15..........................     2,249,675      2,249,675     2,264,839     2,254,784     2,294,675
  Effect of SAB No. 83....................       666,915        666,915       651,751       661,806       621,915
                                            ------------  -------------  ------------  ------------  ------------
    Per SAB No. 83........................     2,916,590      2,916,590     2,916,590     2,916,590     2,916,590
                                            ------------  -------------  ------------  ------------  ------------
                                            ------------  -------------  ------------  ------------  ------------
</TABLE>
    
 
INCOME TAXES
 
    The Company accounts for income taxes in accordance with the provisions of
Statement of Financial Accounting Standards No. 109, "Accounting for Income
Taxes" ("SFAS 109"). SFAS 109 requires that the Company recognize deferred tax
liabilities and assets for the expected future tax consequences of events that
have been included in the financial statements or tax returns. Under this
method, deferred tax liabilities and assets are determined on the basis of the
difference between the tax basis of assets and liabilities and their respective
financial reporting amounts ("temporary differences") at enacted tax rates in
effect for the years in which the temporary differences are expected to reverse.
 
RISKS AND UNCERTAINTIES
 
    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. See also
Note 7(c).
 
                                      F-10
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
                        (1995 INTERIM DATA IS UNAUDITED)
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
IMPACT OF THE ADOPTION OF RECENTLY ISSUED ACCOUNTING STANDARDS
 
    The Financial Accounting Standards Board issued Statement of Financial
Accounting Standards No. 121, "Accounting for the Impairment of Long-Lived
Assets and for Long-Lived Assets to be Disposed of" ("SFAS 121") in March 1995.
SFAS 121 requires companies to review their long-lived assets and certain
identifiable intangibles (collectively, "Long-Lived Assets") for impairment
whenever events or changes in circumstances indicate that the carrying value of
a Long-Lived Asset may not be recoverable. The Company adopted the provisions of
SFAS 121 as of January 1, 1996 which had no impact on the Company's financial
position or results of operations.
 
    The Financial Accounting Standards Board issued Statement of Financial
Accounting Standards No. 123, "Accounting for Stock-Based Compensation" ("SFAS
123") in October 1995. SFAS 123 requires companies to estimate the fair value of
common stock, stock options, or other equity instruments ("Equity Instrument")
issued to employees using pricing models which take into account various
factors, such as the current price of the common stock, volatility, and the
expected life of the Equity Instrument. SFAS 123 permits companies to elect
either to provide pro forma note disclosure or adjust operating results for the
amortization of the estimated value of the Equity Instrument as compensation
expense over the vesting period of the Equity Instrument. The Company has
elected to provide pro forma note disclosure which will appear in its annual
financial statements for the year ending December 31, 1996 and, therefore, the
adoption of SFAS 123 will have no effect on the Company's financial position or
results of operations.
 
STATEMENT OF CASH FLOWS
 
    Supplemental disclosure of noncash investing and financing activities:
 
    For the years ended December 31, 1993, 1994 and 1995:
 
        Capital lease obligations of approximately $71,000, $423,000 and
    $139,000 were incurred during the years ended December 31, 1993, 1994 and
    1995, respectively, when the Company leased new equipment.
 
        In August 1995, the Company issued 45,000 restricted shares of Common
    Stock ("Restricted Shares") in consideration for obtaining a license and
    supply agreement. The estimated fair market value of such shares at the date
    of issuance was $300,000.
 
        In December 1995, a shareholder exchanged a note payable of $1,200,000
    and accrued interest of approximately $24,000 for approximately 61,200
    units. Each unit consists of four shares of Series C Preferred Stock and one
    five-year warrant to purchase one share of Series C Preferred Stock. (See
    Note 5.)
 
        Included in accounts payable, at December 31, 1993, were obligations for
    approximately $30,000 of fixed asset additions.
 
    For the nine months ended September 30, 1996:
 
        Capital lease obligations of approximately $81,000 were incurred during
    the nine months ended September 30, 1996 when the Company leased new
    equipment.
 
                                      F-11
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
                        (1995 INTERIM DATA IS UNAUDITED)
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
        Included in accounts payable, at September 30, 1996, were deferred
    equity issuance costs of approximately $505,000.
 
    For the period from December 1, 1986 (inception) to September 30, 1996:
 
        Capital lease obligations of approximately $1,164,000 were incurred
    during the period from December 1, 1986 (inception) to September 30, 1996
    when the Company leased new equipment.
 
        During 1991, the Company financed the acquisition of laboratory
    equipment by issuing a note payable totaling approximately $64,000 to the
    supplier.
 
        In February 1990, the Company issued a note payable, which at the time
    of issuance had a net present value of approximately $123,000, as partial
    consideration for the acquisition of approximately 3,800,000 shares of
    Common Stock and approximately $52,000 of operating expenses. The shares of
    Common Stock were held as treasury stock and then subsequently retired.
 
        In June 1988, the Company issued a note payable in the amount of $20,000
    as partial consideration for the purchase of 75,000 shares of the Company's
    Common Stock. Such shares, at the time they were acquired, were held as
    treasury stock and then subsequently retired.
 
        During 1988, a stockholder/creditor forgave repayment of a note payable
    totaling approximately $28,000. This transaction was recorded as a
    contribution to capital.
 
3. FIXED ASSETS
 
    Fixed assets, including amounts under capitalized lease obligations, consist
of the following:
 
<TABLE>
<CAPTION>
                                                                               DECEMBER 31,
                                                                        ---------------------------  SEPTEMBER 30,
                                                                            1994          1995           1996
                                                                        ------------  -------------  -------------
<S>                                                                     <C>           <C>            <C>
Computer equipment....................................................  $    279,445  $     286,425   $   167,654
Machinery and equipment...............................................     1,354,811      1,637,460     1,391,018
Furniture and fixtures................................................       181,782        190,008       138,415
Leasehold improvements................................................        29,702         29,702        29,702
                                                                        ------------  -------------  -------------
                                                                           1,845,740      2,143,595     1,726,789
Less, accumulated depreciation and amortization.......................      (886,604)    (1,177,477)     (836,398)
                                                                        ------------  -------------  -------------
                                                                        $    959,136  $     966,118   $   890,391
                                                                        ------------  -------------  -------------
                                                                        ------------  -------------  -------------
</TABLE>
 
                                      F-12
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
                        (1995 INTERIM DATA IS UNAUDITED)
 
4. ACCOUNTS PAYABLE AND ACCRUED EXPENSES
 
    Accounts payable and accrued expenses consist of the following:
 
<TABLE>
<CAPTION>
                                                                                 DECEMBER 31,
                                                                            ----------------------  SEPTEMBER 30,
                                                                               1994        1995         1996
                                                                            ----------  ----------  -------------
<S>                                                                         <C>         <C>         <C>
Accounts payable..........................................................  $   69,515  $  153,749   $   112,104
Fees payable to Scientific Advisory Board members.........................      54,000     116,250        67,000
Accrued payroll and related costs.........................................      15,325      56,235        32,890
Legal and accounting fees payable.........................................      70,501     156,506       638,227
Deferred lease liability, current portion.................................          --       4,349        24,407
                                                                            ----------  ----------  -------------
                                                                            $  209,341  $  487,089   $   874,628
                                                                            ----------  ----------  -------------
                                                                            ----------  ----------  -------------
</TABLE>
 
5. STOCKHOLDERS' EQUITY
 
    On October 2, 1996, the Board of Directors (the "Board") of the Company
approved a three-for-four reverse stock split of common stock. All common stock
data, including loss per share and weighted average number of shares outstanding
has been retroactively amended to reflect the stock split. The Company's
Certificate of Incorporation, as amended, authorizes the Company to issue
60,000,000 shares, of which 40,000,000 shares are designated as common shares,
par value $.0013, and 20,000,000 shares are designated as preferred shares, par
value $.001. The Board has the authority to issue common and preferred shares,
in series, with rights and privileges determined by the Board. 4,000,000
preferred shares are designated as Series A Preferred Stock ("Series A"),
2,500,000 shares are designated as Series B Preferred Stock ("Series B") and
3,750,000 shares are designated as Series C Preferred Stock ("Series C")
(collectively the "Preferred Stock"). During June 1995, the Board rescinded the
designation of unissued Class A Common Stock and designated all common shares as
common stock ("Common Stock"). In the event that the Company declares and pays a
dividend, the Preferred Stock and Common Stock will receive such dividend on a
pro rata basis, as defined. Distributions in liquidation shall be pro rated to
the Preferred Stock and Common Stock up to specified amounts, as defined and,
thereafter, pro rata based upon the number of shares outstanding on a Common
Stock equivalent basis, as defined. Each share of Preferred Stock is
convertible, at the option of the holder, into .75 share of Common Stock,
adjusted in accordance with a formula should the Company sell Preferred or
Common Stock at a per share price below the original issuance price paid by
existing Preferred Stock shareholders ("Preferred Stockholder"), as defined.
Conversion is automatic at the earlier of (i) the closing of a public offering
of the Company's Common Stock in which certain defined aggregate proceeds are
raised and the per share selling price exceeds a defined level, or (ii) the date
the Preferred Stockholders have converted a defined number of shares of
Preferred Stock. The conversion rate is subject to anti-dilution provisions, as
defined. Preferred Stockholders are entitled to vote with Common Stockholders as
a single class. In addition, certain changes in the Company's capital structure,
as defined, which includes, under certain situations, the issuance of additional
series of Preferred or Common Stock (the "Proposal"), require a separate vote by
Preferred Stockholders. If less than a majority of Preferred Stockholders vote
in favor of the Proposal and if the Common Stockholders approve the Proposal,
the Company has the right to redeem all outstanding shares of Preferred Stock at
per share prices ranging from $3.46 to $8.84, as defined. The Preferred Stock
also is subject to transfer restrictions, as defined, and the Company has the
right of first refusal to acquire such
 
                                      F-13
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
                        (1995 INTERIM DATA IS UNAUDITED)
 
5. STOCKHOLDERS' EQUITY (CONTINUED)
shares in the event the holder proposes to sell any or all shares to any person
other than a permitted transferee.
 
    During 1988, the Company entered into subscription agreements ("Agreements")
in connection with the sale of approximately 1,000,000 shares of its Common
Stock at a per share price of $1.07. The Agreements contain a provision whereby
investors have the right to receive additional shares of Common Stock, as
defined, in the event the Company sells Common Stock at a per share price below
$1.07. This right terminates upon any registered public offering, any sale of
the Company or its assets, or upon the Company selling an aggregate of 7,500,000
shares of Common Stock.
 
    During 1989 and 1990, the Company raised $2,913,000 from the sale of
1,165,000 Units (the "A Units") in a private placement. Each A Unit consisted of
one share of Series A Preferred Stock and one warrant (the "A Warrant") which
entitled the holder to purchase one share of Series A Preferred Stock at a price
of $2.75 per share. During 1991, 1,143,000 A Warrants were exercised yielding
$3,143,000 to the Company. The remaining unexercised A Warrants have expired.
 
    During 1992 and 1993, the Company raised $5,049,000, after expenses, from
the sale of 1,263,520 Units (the "B Units") in a private placement. Each B Unit
consisted of one share of Series B Preferred Stock and one warrant (the "B
Warrant") which, as amended, entitled the holder to purchase one share of Series
B Preferred Stock at a price of $5.00 per share. During 1994, 719,310 B Warrants
were exercised yielding $3,597,000 to the Company. The remaining unexercised B
Warrants have expired.
 
    During the fourth quarter of 1995 and the first quarter of 1996, the Company
raised $897,000 and $4,777,000, net of expenses, from the sale of approximately
44,900 Units and 241,203 Units, respectively, (the "C Units") in a private
placement. In addition, during December 1995, a stockholder converted a note
payable (see Note 6). Each C Unit consists of four shares of Series C Preferred
Stock and one five-year warrant (the "C Warrant") which entitles the holder to
purchase one share of Series C Preferred Stock at $5.00 per share or, if
exercised subsequent to an initial public offering, as defined, .75 share of
Common Stock at $6.67 per share. The number of C Warrants and their exercise
price are subject to adjustment in the event the Company issues additional
shares of Common Stock at below defined per share prices. As of September 30,
1996, 347,249 C Warrants were issued and outstanding and fully exercisable.
 
6. NOTE PAYABLE--STOCKHOLDER
 
    During 1995, the Company borrowed $1,200,000 under a promissory note from a
stockholder. The promissory note, as amended and restated, provided for interest
to accrue at a rate of 10% per annum. Interest and principal were payable upon
demand, but not before December 8, 1995. During December 1995, the promissory
note plus accrued interest of $23,671 were exchanged for approximately 61,200 C
Units (see Note 5).
 
                                      F-14
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                        (1995 INTERIM DATA IS UNAUDITED)
 
7. COMMITMENTS AND CONTINGENCIES:
 
(A) OPERATING LEASES
 
    The Company leases office and laboratory space under a noncancelable
sublease agreement expiring December 30, 1997 (the "sublease") and a lease
agreement expiring April 30, 1998 (the "lease"). The sublease, as amended, and
the lease provide for escalations of the minimum rent during the lease term as
well as additional charges based upon usage of certain utilities in excess of
defined amounts ("Additional Utility Charges"). The Company recognizes rental
expense from the sublease and lease on the straight-line basis. During 1994 and
1995, the Company recognized rental expense in excess of amounts paid of
approximately $18,000 and $24,000, respectively, while during the year ended
December 31, 1993 and the nine months ended September 30, 1996, approximately
$20,000 and $3,000 of previously recognized rent expense, which had been
included as a deferred lease liability at December 31, 1992 and 1995,
respectively, was paid.
 
    The Company also leases office equipment and an automobile under
noncancelable operating leases. The leases expire at various times through July
1997.
 
    Future minimum annual payments under all operating lease agreements,
including the sublease and lease, are as follows:
 
<TABLE>
<CAPTION>
                                                                                    MINIMUM
                                  YEARS ENDING                                       ANNUAL
                                 SEPTEMBER 30,                                      PAYMENTS
                                ---------------                                   ------------
<S>                                                                               <C>
1997............................................................................  $    669,034
1998............................................................................       403,685
                                                                                  ------------
                                                                                  $  1,072,719
                                                                                  ------------
                                                                                  ------------
</TABLE>
 
    Rental expense totaled approximately $353,000, $506,000, $657,000, $481,000
and $2,854,000 for the years ended December 31, 1993, 1994 and 1995, for the
nine months ended September 30, 1996 and for the period from December 1, 1986
(inception) to September 30, 1996, respectively. Additional Utility Charges, as
defined above, were not material for these periods.
 
(B) CAPITAL LEASES
 
    The Company leases certain equipment under various noncancelable capital
lease agreements. The leases are for periods ranging from two to five years,
after which the Company: (i) either has the option or is required to purchase
the equipment at defined amounts or (ii) may extend the lease for up to one
additional year at defined monthly payments or (iii) is required to return the
equipment, as per the respective lease agreements. Certain capital leases, as
amended, contain various covenants which include maintaining a minimum tangible
net worth, as defined, of at least $625,000 during the term of the leases. This
covenant indirectly restricts the Company's ability to pay dividends.
 
                                      F-15
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                        (1995 INTERIM DATA IS UNAUDITED)
 
7. COMMITMENTS AND CONTINGENCIES: (CONTINUED)
    As of September 30, 1996, minimum annual payments under all capital leases,
including required payments to acquire leased equipment, are as follows:
 
<TABLE>
<CAPTION>
                                                                                     MINIMUM
                                   YEARS ENDING                                       ANNUAL
                                  SEPTEMBER 30,                                      PAYMENTS
                                 ---------------                                    ----------
<S>                                                                                 <C>
1997..............................................................................  $  160,983
1998..............................................................................      82,715
1999..............................................................................      56,909
2000..............................................................................      37,863
2001..............................................................................      19,901
                                                                                    ----------
                                                                                       358,371
Less, amounts representing interest...............................................      86,592
                                                                                    ----------
Present value of net minimum capital lease payments...............................  $  271,779
                                                                                    ----------
                                                                                    ----------
</TABLE>
 
    Leased equipment included as a component of fixed assets was approximately
$591,000, $731,000 and $799,000 at December 31, 1994 and 1995 and September 30,
1996, respectively; related accumulated depreciation was approximately $119,000,
$242,000 and $342,000 for the same respective periods.
 
(C) LICENSING AGREEMENTS:
 
    (I) UNIVERSITIES
 
   
    In March 1989, the Company (as licensee) entered into a worldwide licensing
agreement with Columbia University ("Columbia"). The license, as amended during
October 1996, provides the Company with the exclusive right to use certain
technology developed on behalf of Columbia. According to the terms of the
agreement, the Company is required to pay nonrefundable licensing fees
("Licensing Fees"), payable in installments by defined dates or, if earlier, as
certain milestones associated with product development ("Milestones") occur, as
defined, which include the manufacture and distribution of a product which uses
the licensed technology, at various times over the next eight years. The Company
expenses Licensing Fees when they become payable by the Company to Columbia. In
addition, the Company is required to remit royalties based upon the greater of
minimum royalties, as defined, or a percentage of net sales of products which
utilize the licensed technology and a portion of sublicensing income, as
defined. The licensing agreement may be terminated by Columbia under certain
circumstances which includes the Company's failure to achieve the Milestones;
however, Columbia shall not unreasonably withhold its consent to revisions to
the due dates for achieving the Milestones under certain circumstances. If not
terminated early, the agreement shall continue until expiration, lapse or
invalidation of Columbia's patents on the licensed technology. The Company has
the right to terminate the agreement at any time upon 90 days prior written
notice. The termination of the license could have a material adverse effect on
the business of the Company.
    
 
    In January 1991, the Company (as licensee) also entered into a non-exclusive
licensing agreement with Stanford University whereby the Company has the
non-exclusive, non-transferable right to use certain technology owned by the
university. According to the terms of the agreement, the Company will be
 
                                      F-16
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                        (1995 INTERIM DATA IS UNAUDITED)
 
7. COMMITMENTS AND CONTINGENCIES: (CONTINUED)
required to remit royalties at various rates, as defined. Royalties shall
continue to be payable, irrespective of termination of this license agreement,
until such time as all sales of products which utilize the licensed technology
shall have ceased.
 
    In September 1996, the Company (as licensee) entered into a licensing
agreement with The Regents of the University of California ("U of C"). According
to the terms of the agreement, the Company is required to remit royalties based
upon the greater of minimum royalties or a percentage of product sales and a
portion of sublicensing income, as defined. The agreement can be terminated by
the Company upon 90 days notice or by U of C in the event the Company fails to
perform, which includes the achievement of certain defined milestones; otherwise
the agreement terminates upon the lapse of U of C's patent regarding the
licensed technology. Early termination of the agreement could have a material
adverse effect on the business of the Company. Although the Company intends to
use its best efforts to comply with the terms of the agreement, there can be no
assurances that the agreement will not be terminated.
 
    (II) SLOAN-KETTERING INSTITUTE FOR CANCER RESEARCH
 
   
    In November 1994, the Company (as licensee) entered into a worldwide
exclusive licensing agreement with Sloan-Kettering Institute for Cancer Research
("Sloan-Kettering") whereby the Company has the exclusive right to use certain
technology owned by Sloan-Kettering. Certain employees of Sloan-Kettering are
consultants to the Company (see Note 7(d)). The agreement requires the Company
to pay nonrefundable, noncreditable licensing fees in installments. The Company
expenses such installments when they become payable by the Company to
Sloan-Kettering. Commencing in 1995, the Company is required to remit royalties
based upon the greater of minimum royalties, as defined, or as a percentage of
sales of any licensed product, as defined ("Product Royalties"), and sublicense
income, as defined, earned under sublicenses granted by the Company in
accordance with this licensing agreement ("Sublicense Royalties"). In the event
that no Product Royalties or Sublicense Royalties are due in a given calendar
year, then a defined percentage of that year's minimum royalty will be
creditable against future Product Royalties or Sublicense Royalties due
Sloan-Kettering. The licensing agreement may be terminated by Sloan-Kettering in
the event that the Company fails to achieve certain defined objectives, which
include the manufacture and distribution of a product which uses the licensed
technology, over the next six years, or if the Company fails to satisfy certain
other contractual obligations ("Early Termination"); otherwise the agreement
shall terminate either upon the expiration or abandonment of Sloan-Kettering's
patents on the technology licensed, or 15 years from the date of first
commercial sale, as defined, whichever is later. With regard to Early
Termination, Sloan-Kettering shall not unreasonably withhold its consent to
revisions to the due dates for achieving the defined objectives under certain
circumstances. The Company has the right to terminate the agreement at any time
upon 90 days prior written notice ("Company Termination"). In the event of Early
Termination or Company Termination, all licensing rights under the agreement
would revert to Sloan-Kettering. Early Termination of the license could have a
material adverse effect on the business of the Company. Although the Company
intends to use its best efforts to comply with the terms of the license, there
can be no assurance that the licensing agreement will not be terminated.
    
 
                                      F-17
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                        (1995 INTERIM DATA IS UNAUDITED)
 
7. COMMITMENTS AND CONTINGENCIES: (CONTINUED)
    (III) AQUILA BIOPHARMACEUTICALS, INC.
 
    In August 1995, the Company (as licensee) entered into a license and supply
agreement (the "L&S Agreement") with Aquila Biopharmaceuticals, Inc. ("Aquila").
Under the terms of the L&S Agreement, the Company obtained a coexclusive license
to use certain technology and a right to purchase QS-21 adjuvant (the "Product")
from Aquila for use in the Company's research and development activities. In
consideration for the license, the Company paid a nonrefundable, noncreditable
license fee and issued 45,000 restricted shares of the Company's Common Stock
("Restricted Shares") to Aquila. The Restricted Shares are nontransferable with
this restriction lapsing upon the Company's achievement of certain milestones
("L&S Milestones"), as defined. In the event that any one or more L&S Milestones
do not occur, the underlying Restricted Shares would be returned to the Company.
The fair value of the Restricted Shares, combined with the noncreditable license
fee, were expensed during 1995 as research and development. In addition, the
Company will be required to remit royalties based upon the net sales of products
sold using the licensed technology ("Licensed Products") and a defined
percentage of any sublicense fees and royalties payable to the Company with
respect to Licensed Products. The L&S Agreement may be terminated by Aquila in
the event that the Company fails to achieve certain defined objectives, which
include the manufacture and distribution of a Licensed Product, over the next
seven years ("Early Termination"); otherwise the L&S Agreement shall terminate
upon the expiration of Aquila's patents on the technology licensed. With regard
to Early Termination, Aquila shall not unreasonably withhold its consent to
revisions to the due dates for achieving the L&S Milestones under certain
circumstances. The Company has the right to terminate the L&S Agreement at any
time upon 90 days prior written notice ("Company Termination"), as defined. In
the event of Early Termination or Company Termination, all licensing rights
under the agreement would revert to Aquila. Early termination of the L&S
Agreement would have a material adverse effect on the business of the Company.
Although the Company intends to use its best efforts to comply with the terms of
the L&S Agreement, there can be no assurance that the agreement will not be
terminated.
 
    In connection with the above agreements, the Company has recognized expenses
totaling approximately $10,000, $22,500, $382,500, $22,500 and $807,500 for the
years ended December 31, 1993, 1994 and 1995, for the nine months ended
September 30, 1996 and for the period from December 1, 1986 (inception) to
September 30, 1996, respectively. Such expenses include the fair value of the
Restricted Shares. In addition, remaining payments associated with milestones or
defined objectives under the above agreements total $650,000. Future annual
minimum royalties under the licensing agreements above are not significant.
 
(D) CONSULTING AGREEMENTS
 
    As part of the Company's research and development efforts it enters into
consulting agreements ("Agreements") with external scientific specialists
("scientists"). These Agreements contain varying terms and provisions which
include fees to be paid by the Company and services to be provided by the
scientists, some of whom are members of the Company's Scientific Advisory Board.
Certain scientists have purchased Common Stock or received stock options which
are subject to vesting provisions, as defined. The Company has recognized
expenses with regards to these Agreements totaling approximately $136,000,
$261,000, $245,000, $232,000 and $1,398,000 for the years ended December 31,
1993, 1994 and 1995, for the nine
 
                                      F-18
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                        (1995 INTERIM DATA IS UNAUDITED)
 
7. COMMITMENTS AND CONTINGENCIES: (CONTINUED)
months ended September 30, 1996, and for the period from December 1, 1986
(inception) to September 30, 1996, respectively. Such expenses include the fair
value of stock options.
 
8. STOCK OPTION PLANS:
 
(A) 1989 NON-QUALIFIED STOCK OPTION PLAN
 
    On April 1, 1989, the Company adopted a Non-Qualified Stock Option Plan (the
"89 Plan"), under which a maximum of 375,000 shares of Common Stock, adjusted
for stock splits, stock dividends and other capital adjustments, as defined, are
available for stock option awards to employees, consultants, directors and other
individuals who render services to the Company. For a period of ten years
following the termination for any reason of an optionee's employment or active
involvement with the Company, as determined by the Board, the Company has the
right to repurchase any or all shares of Common Stock held by the optionee
and/or any or all of the vested but unexercised portion of any option granted
under the 89 Plan to such optionee at a purchase price defined by the 89 Plan.
The 89 Plan terminated on April 1, 1994, and any option granted before
termination of the 89 Plan shall continue under the terms of the 89 Plan.
 
    Certain options issued from the 89 Plan entitle the holders to purchase
shares of Common Stock at a per share price of $1.33, which was less than the
estimated fair market value of the Common Stock, as determined by the Board of
Directors, on the date of grant. As a result, the Company is recognizing
compensation expense on a pro rata basis, over the respective options' vesting
periods of three to ten years, for the difference between the estimated fair
market value of the Common Stock on the date the option was granted and the
exercise price. The Company recognized compensation expense of approximately
$37,000, $33,000, $21,000, $17,000 and $299,000 for the years ended December 31,
1993, 1994 and 1995, for the nine months ended September 30, 1996, and for the
period from December 1, 1986 (inception) to September 30, 1996, respectively, in
connection with these options.
 
    Transactions involving stock option awards under the 89 Plan during 1993,
1994, 1995 and the nine months ended September 30, 1996 are summarized as
follows:
 
<TABLE>
<CAPTION>
                                                                                         NUMBER          PRICE
                                                                                        OF SHARES      PER SHARE
                                                                                       -----------  ----------------
<S>                                                                                    <C>          <C>
Balance outstanding, December 31, 1992...............................................     311,332     $1.33 to $3.67
1993: Granted........................................................................      54,188        $5.33
                                                                                       -----------
     Balance outstanding, December 31, 1993..........................................     365,520     $1.33 to $5.33
1994: Canceled.......................................................................        (259)       $1.33
                                                                                       -----------
     Balance outstanding, December 31, 1994..........................................     365,261     $1.33 to $5.33
1995: Canceled.......................................................................     (11,250)       $3.67
                                                                                       -----------
     Balance outstanding, December 31, 1995 and September 30, 1996...................     354,011     $1.33 to $5.33
                                                                                       -----------
                                                                                       -----------
</TABLE>
 
                                      F-19
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                        (1995 INTERIM DATA IS UNAUDITED)
 
8. STOCK OPTION PLANS: (CONTINUED)
    The total number of options exercisable under the 89 Plan at September 30,
1996 was 276,386 at exercise prices of $1.33 to $5.33 per share. As of September
30, 1996, no shares are available for future grants.
 
(B) 1993 STOCK OPTION PLAN
 
    On December 2, 1993, the Company adopted a Stock Option Plan (the "93
Plan"). Under the 93 Plan, as amended, a maximum of 750,000 shares of Common
Stock, adjusted for stock splits, stock dividends, and other capital
adjustments, as defined, are available for stock option awards. Awards issued
under the 93 Plan may qualify as incentive stock options ("ISOs"), as defined by
the Internal Revenue Code, or may be granted as non-qualified stock options.
Under the 93 Plan, the Compensation Committee of the Board of Directors (the
"Committee") may award options to employees, directors who are not employees and
other individuals who render services to the Company. For a period of ten years
following the termination for any reason of an optionee's employment or active
involvement with the Company, as determined by the Board of Directors, the
Company shall have the right to repurchase any or all shares of Common Stock
acquired under the 93 Plan and held by the optionee and/or any or all of the
vested but unexercised portion of any option granted under the 93 Plan to such
optionee at a purchase price, as defined by the 93 Plan. This right will
terminate upon the Company's completion of a public offering of securities, as
defined. The 93 Plan will terminate on December 2, 2003; however, any option
outstanding as of the termination date shall remain outstanding until such
option expires in accordance with the terms of the respective grant.
 
    During 1994, the Committee granted 582,000 stock options under the 93 Plan.
Included therein were 450,000 stock options ("94 Options") which entitle the
holders to purchase shares of Common Stock at a per share price of $5.33, which
was less than the estimated fair market value of the Common Stock, as determined
by the Board of Directors, on the date of issuance. As a result, the Company is
recognizing compensation expense on a pro rata basis, over the respective
options' vesting periods of seven years, for the difference between the
estimated fair market value of the Common Stock on the date the option was
issued and the exercise price. In addition, during 1996, the Committee granted
94,500 options under the 93 Plan. Included therein were 15,000 options issued to
consultants ("Consultants' Options") that are compensatory. Accordingly, the
Company is recognizing compensation expense on a pro rata basis over the
respective options' vesting periods of four to five years. The Company
recognized compensation expense of approximately $86,000 for each of the years
ended December 31, 1994 and 1995, approximately $82,000 for the nine months
ended September 30, 1996 and approximately $254,000 for the period from December
1, 1986 (inception) to September 30, 1996, in connection with the 94 Options and
the Consultants' Options.
 
                                      F-20
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                        (1995 INTERIM DATA IS UNAUDITED)
 
8. STOCK OPTION PLANS: (CONTINUED)
    The following table summarizes the activity in the 93 Plan:
 
   
<TABLE>
<CAPTION>
                                                                                         NUMBER          PRICE
                                                                                        OF SHARES      PER SHARE
                                                                                       -----------  ----------------
<S>                                                                                    <C>          <C>
1993: Granted........................................................................      63,975        $5.33
                                                                                       -----------
     Balance outstanding, December 31, 1993..........................................      63,975        $5.33
1994: Granted........................................................................     582,000     $5.33 to $6.67
                                                                                       -----------
     Balance outstanding, December 31, 1994..........................................     645,975     $5.33 to $6.67
1995: Granted........................................................................       4,500        $6.67
     Cancelled.......................................................................     (33,750)    $5.33 to $6.67
                                                                                       -----------
     Balance outstanding, December 31, 1995..........................................     616,725     $5.33 to $6.67
1996: Granted........................................................................      94,500     $5.33 to $6.67
     Cancelled.......................................................................     (24,000)       $5.33
                                                                                       -----------
     Balance outstanding, September 30, 1996.........................................     687,225     $5.33 to $6.67
                                                                                       -----------
                                                                                       -----------
</TABLE>
    
 
    The total number of options exercisable under the 93 Plan at September 30,
1996 was 185,166 at exercise prices of $5.33 to $6.67 per share. As of September
30, 1996, shares available for future grants under the 93 Plan amounted to
62,775.
 
(C) 1993 EXECUTIVE STOCK OPTION PLAN
 
    On December 15, 1993, the Company adopted an Executive Stock Option Plan
(the "Executive Plan"), under which a maximum of 750,000 shares of Common Stock,
adjusted for stock splits, stock dividends, and other capital adjustments, as
defined, are available for stock option awards. Awards issued under the
Executive Plan may qualify as ISOs, as defined by the Internal Revenue Code, or
may be granted as non-qualified stock options. Under the Executive Plan, the
Board may award options to senior executive employees (including officers who
may be members of the Board) of the Company, as defined. The Executive Plan will
terminate on December 15, 2003; however, any option outstanding as of the
termination date shall remain outstanding until such option expires in
accordance with the terms of the respective grant.
 
    During December 1993, the Board awarded a total of 750,000 stock options
under the Executive Plan to one officer, of which 664,774 were non-qualified
options ("NQOs") and 85,226 were ISOs. The NQOs and ISOs entitle the officer to
purchase an equal number of shares of Common Stock at prices of $5.33 and $5.87
per share, respectively, which represented the estimated fair market value and
110% of the estimated fair market value of the Company's Common Stock at the
date of grant, as determined by the Board of Directors. 375,000 of the options
vest over a period of five years, with the remaining 375,000 options vesting in
full on the tenth anniversary of the date of grant; however, vesting will be
accelerated in the event of the effective date of an initial public offering of
the Company's Common Stock or immediately before the closing of an acquisition
of the Company.
 
                                      F-21
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                        (1995 INTERIM DATA IS UNAUDITED)
 
8. STOCK OPTION PLANS: (CONTINUED)
    750,000 options were outstanding at September 30, 1996 under the Executive
Plan, of which 225,000 were exercisable. As of September 30, 1996, no shares
were available for future grants under the Executive Plan.
 
(D) 1996 STOCK INCENTIVE PLAN
 
    During May 1996, the Company adopted the 1996 Stock Incentive Plan (the "96
Plan"). The 96 Plan, as amended, provides for the award of 750,000 shares of
Common Stock, adjusted for stock splits, stock dividends and other capital
adjustments as defined. Under the 96 Plan, the Committee may award stock to
eligible individuals which includes employees, advisors or consultants to the
Company. The form of the award will be determined by the Committee and includes
stock options, which may be ISOs, stock appreciation rights, restricted stock,
performance awards or phantom stock as defined (collectively "Awards"). The
Committee will also determine the term and vesting of the Award and the
Committee may in its discretion accelerate the vesting of an award at any time.
To date there have been no Awards issued from the 96 Plan.
 
9. EMPLOYEE SAVINGS PLAN
 
    The Company, during 1993, adopted the provisions of the amended and restated
Progenics Pharmaceuticals 401(k) Plan (the "Amended Plan"). The terms of the
Amended Plan, among other things, allow eligible employees, as defined, to
participate in the Amended Plan by electing to contribute to the Amended Plan a
percentage of their compensation to be set aside to pay their future retirement
benefits, as defined. The Company has agreed to match 25% of up to the first 8%
of compensation that eligible employees contribute to the Amended Plan, as
defined. In addition, the Company may also make a discretionary contribution, as
defined, each year on behalf of all participants who are non-highly compensated
employees, as defined. The Company made matching contributions of approximately
$3,000, $10,000, $12,000, $8,000 and $33,000 to the Amended Plan for the years
ended December 31, 1993, 1994 and 1995, for the nine months ended September 30,
1996, and for the period from December 1, 1986 (inception) to September 30,
1996, respectively.
 
10. INCOME TAXES
 
    There is no provision (benefit) for federal or state income taxes for all
periods presented, since the Company has incurred operating losses since
inception and has established a valuation allowance equal to the total deferred
tax asset.
 
                                      F-22
<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                        (A DEVELOPMENT STAGE ENTERPRISE)
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                        (1995 INTERIM DATA IS UNAUDITED)
 
10. INCOME TAXES (CONTINUED)
    The tax effect of temporary differences, net operating loss carry-forwards
and research and experimental tax credit carry-forwards as of December 31, 1994
and 1995 and September 30, 1996 are as follows:
 
<TABLE>
<CAPTION>
                                             DECEMBER 31,        SEPTEMBER
                                        ----------------------      30,
                                           1994        1995        1996
                                        ----------  ----------  -----------
<S>                                     <C>         <C>         <C>
Deferred tax assets and valuation
  allowance:
  Net operating loss carry-forwards...  $4,022,832  $4,350,960  $ 5,136,183
  Fixed assets........................      93,877     133,225      163,470
  Deferred charges....................   1,228,617   2,666,772    3,291,562
  Research and experimental tax credit
    carry-forwards....................     426,234     491,681      524,323
  Valuation allowance.................  (5,771,560) (7,642,638)  (9,115,538)
                                        ----------  ----------  -----------
                                            --          --          --
                                        ----------  ----------  -----------
                                        ----------  ----------  -----------
</TABLE>
 
    As of September 30, 1996, the Company has available, for tax purposes,
unused net operating loss carry-forwards of approximately $12,400,000 which will
expire in various years from 2002 to 2011. The Company's research and
experimental tax credit carry-forwards expire in various years from 2003 to
2011. Future ownership changes may limit the future utilization of these net
operating loss and research and experimental tax credit carry-forwards as
defined by the federal tax code.
 
11. NOTE TO INTERIM FINANCIAL STATEMENTS FOR THE NINE MONTHS ENDED SEPTEMBER 30,
1995 (UNAUDITED)
 
BASIS OF PRESENTATION
 
    The interim financial statements for the nine months ended September 30,
1995 are unaudited and reflect adjustments, consisting of only normal recurring
accruals, which are, in the opinion of the Company's management, necessary for a
fair presentation of the financial position and results of operations for the
periods presented. Operating results for any interim period are not necessarily
indicative of the results for the full year.
 
STATEMENT OF CASH FLOWS
 
    Supplemental disclosure of noncash investing and financing activities:
 
    Capital lease obligations of approximately $63,000 were incurred during the
nine months ended September 30, 1995 when the Company leased new equipment.
 
    Included in accounts payable, at September 30, 1995, were obligations for
approximately $32,000 of fixed asset additions.
 
                                      F-23
<PAGE>
PROGENICS PLANS TO INITIATE PHASE I/II CLINICAL TRIALS IN 1997 OF ITS TWO MOST
ADVANCED HIV PRODUCT CANDIDATES, PRO 542 AND PRO 367.
 
PRO 542 IS PROGENICS' THERAPEUTIC PRODUCT CANDIDATE DESIGNED TO NEUTRALIZE HIV.
 
[DIAGRAM DEPICTING PRO 542, PROGENICS' THERAPEUTIC PRODUCT CANDIDATE DESIGNED TO
NEUTRALIZE HIV]
 
PRO 367 IS PROGENICS' THERAPEUTIC PRODUCT CANDIDATE DESIGNED TO DESTROY HIV-
INFECTED CELLS.
 
[DIAGRAM DEPICTING PRO 367, PROGENICS' THERAPEUTIC PRODUCT CANDIDATE DESIGNED TO
DESTROY HIV-INFECTED CELLS]
<PAGE>
- ------------------------------------------------
                                ------------------------------------------------
- ------------------------------------------------
                                ------------------------------------------------
 
    NO DEALER, SALESPERSON OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS IN CONNECTION WITH THIS OFFERING
OTHER THAN THOSE 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 ANY UNDERWRITER. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER
TO SELL OR A SOLICITATION OF ANY OFFER TO BUY BY ANYONE IN ANY JURISDICTION IN
WHICH SUCH OFFER TO SELL OR A SOLICITATION IS NOT AUTHORIZED, OR IN WHICH THE
PERSON MAKING SUCH OFFER OR SOLICITATION IS NOT QUALIFIED TO DO SO, OR TO ANY
PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION. NEITHER THE
DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY
CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE
AFFAIRS OF THE COMPANY SINCE THE DATE AS OF WHICH INFORMATION IS FURNISHED.
                              -------------------
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                                  PAGE
                                                                ---------
<S>                                                             <C>
Prospectus Summary............................................          3
Risk Factors..................................................          6
Use of Proceeds...............................................         17
Dividend Policy...............................................         17
Capitalization................................................         18
Dilution......................................................         19
Selected Financial Data.......................................         20
Management's Discussion and Analysis of Financial Condition
  and Results of Operations...................................         21
Business......................................................         25
Management....................................................         46
Certain Transactions..........................................         55
Principal Stockholders........................................         56
Description of Capital Stock..................................         58
Shares Eligible for Future Sale...............................         60
Underwriting..................................................         62
Legal Matters.................................................         64
Experts.......................................................         64
Additional Information........................................         64
Index to Financial Statements.................................        F-1
</TABLE>
    
 
                              -------------------
 
    UNTIL              , 1996 (25 DAYS AFTER THE DATE OF THIS PROSPECTUS), ALL
DEALERS EFFECTING TRANSACTIONS IN THE REGISTERED SECURITIES, 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.
 
                                2,000,000 SHARES
 
                                 [COMPANY LOGO]
 
                                                           Pharmaceuticals, Inc.
 
                                  COMMON STOCK
 
                                 --------------
 
                                   PROSPECTUS
 
                                 --------------
 
                            OPPENHEIMER & CO., INC.
                     VECTOR SECURITIES INTERNATIONAL, INC.
                                           , 1996
 
- ------------------------------------------------
                                ------------------------------------------------
- ------------------------------------------------
                                ------------------------------------------------
<PAGE>
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
    The following is an itemized statement of the estimated amounts of all
expenses payable by the Registrant in connection with the registration of the
Common Stock offered hereby, other than underwriting discounts and commissions:
 
   
<TABLE>
<S>                                                                 <C>
Registration Fee--Securities and Exchange Commission..............  $   9,061
NASD Filing Fee...................................................      3,490
Blue Sky fees and expenses........................................     20,000
Accountants' fees and expenses....................................    260,000
Legal fees and expenses...........................................    300,000
Printing and engraving expenses...................................    150,000
Transfer agent and registrar fees.................................      5,000
Miscellaneous.....................................................      2,449
                                                                    ---------
            Total.................................................  $ 750,000
                                                                    ---------
                                                                    ---------
</TABLE>
    
 
   
ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS
    
 
    Section 145(a) of the General Corporation Law of the State of Delaware (the
"DGCL") provides that a Delaware corporation may indemnify any person who was or
is a party or is threatened to be made a party to any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by or in the right of the corporation) by
reason of the fact that he is or was a director, officer, employee or agent of
the corporation or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation or enterprise,
against expenses, judgments, fines and amounts paid in settlement actually and
reasonably incurred by him in connection with such action, suit or proceeding if
he acted in good faith and in a manner he reasonably believed to be in or not
opposed to the best interests of the corporation, and, with respect to any
criminal action or proceeding, had no cause to believe his conduct was unlawful.
 
    Section 145(b) of the DGCL provides that a Delaware corporation may
indemnify any person who was or is a party or is threatened to be made a party
to any threatened, pending or completed action or suit by or in the right of the
corporation to procure a judgment in its favor by reason of the fact that such
person acted in any of the capacities set forth above, against expenses actually
and reasonably incurred by him in connection with the defense or settlement of
such action or suit if he acted under similar standards, except that no
indemnification may be made in respect of any claim, issue or matter as to which
such person shall have been adjudged to be liable to the corporation unless and
only to the extent that the court in which such action or suit was brought shall
determine that despite the adjudication of liability, such person is fairly and
reasonably entitled to be indemnified for such expenses which the court shall
deem proper.
 
    Section 145 of the DGCL further provides that to the extent a director or
officer of a corporation has been successful in the defense of any action, suit
or proceeding referred to in subsections (a) and (b) or in the defense of any
claim, issue, or matter therein, he shall be indemnified against expenses
actually and reasonably incurred by him in connection therewith; that
indemnification provided for by Section 145 shall not be deemed exclusive of any
other rights to which the indemnified party may be entitled; and that the
corporation may purchase and maintain insurance on behalf of a director or
officer of the corporation against any liability asserted against him or
incurred by him in any such capacity or arising out of his status
 
                                      II-1
<PAGE>
as such whether or not the corporation would have the power to indemnify him
against such liabilities under such Section 145.
 
    Section 102(b)(7) of the DGCL provides that a corporation in its original
certificate of incorporation or an amendment thereto validly approved by
stockholders may eliminate or limit personal liability of members of its board
of directors or governing body for breach of a director's fiduciary duty.
However, no such provision may eliminate or limit the liability of a director
for breaching his duty of loyalty, failing to act in good faith, engaging in
intentional misconduct or knowingly violating a law, paying a dividend or
approving a stock repurchase which was illegal, or obtaining an improper
personal benefit. A provision of this type has no effect on the availability of
equitable remedies, such as injunction or rescission, for breach of fiduciary
duty. The Company's Restated Certificate of Incorporation contains such a
provision.
 
    The Company's Certificate of Incorporation and By-Laws provide that the
Company shall indemnify officers and directors, and to the extent authorized by
the Board of Directors, employees and agents of the Company, to the full extent
permitted by and in the manner permissible under the laws of the State of
Delaware. In addition, the By-Laws permit the Board of Directors to authorize
the Company to purchase and maintain insurance against any liability asserted
against any director, officer, employee or agent of the Company arising out of
his capacity as such.
 
    The Company has entered into Indemnification Agreements with each of its
officers and directors, pursuant to which the Company has agreed to indemnify
and advance expenses to such officers and directors to the fullest extent
permitted by applicable law.
 
    The Company has obtained an insurance policy providing coverage for certain
liabilities of its officers and directors.
 
ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES
 
   
    During the past three years, the Registrant has issued securities to a
limited number of persons, as described below. No underwriter or underwriting
discounts or commissions were involved. There was no public offering in any such
transaction and the Company believes that each transaction was exempt from the
registration requirements of the Securities Act of 1933 (the "Securities Act")
by reason of Section 4(2) thereof based on the private nature of the
transactions and the sophistication of the purchasers, all of whom had access to
information concerning the Registrant and acquired the securities for investment
and not with a view to the distribution thereof.
    
 
   
    From January 1993 through August 1993, the registrant issued a total of
272,270 shares of Series B Preferred Stock, $.001 par value per share, and
warrants to purchase 272,270 shares of Series B Preferred Stock, to 33
individuals and entities of whom two entities are affiliates of the Company, one
individual is a director and the rest are accredited investors for an aggregate
purchase price of $1,089,080 in cash.
    
 
   
    In September 1993 and October 1993, the registrant issued a total of 562,500
shares of Series B Preferred Stock, and warrants to purchase 562,500 shares of
Series B Preferred Stock, to three entities of whom two entities are affiliates
of the Company and the remaining entity is an accredited investor for an
aggregate purchase price of $2,250,000.
    
 
   
    In February 1994, the registrant issued a total of 719,310 shares of Series
B Preferred Stock to 22 individuals and entities of whom one entity is an
affiliate of the Company, one individual is a director and the remaining
individuals and entities are accredited investors for an aggregate purchase
price of $3,596,550 in cash.
    
 
   
    In November 1995 and December 1995, the registrant issued a total of 424,184
shares of Series C Preferred Stock, $.001 par value per share, and warrants to
purchase 106,046 shares of Series C Preferred Stock, to seven individuals and
entities of whom one individual is a director, two entities are affiliated with
a director of the Company and the remaining individuals and entities are
accredited investors for an
    
 
                                      II-2
<PAGE>
   
aggregate purchase price of $897,249 in cash and conversion of a note payable in
the principal amount of $1,200,000 plus accrued interest thereon of $23,671.
    
 
   
    In December 1995, the registrant issued 45,000 shares of Common Stock,
$.0013 par value per share, to one entity which is a licensor as partial
consideration for a license agreement.
    
 
   
    In January 1996 and February 1996, the registrant issued a total of 964,812
shares of Series C Preferred Stock, and warrants to purchase 241,203 shares of
Series C Preferred Stock, to 59 individuals and entities of whom two entities
are affiliates of the Company, two individuals are directors and the remaining
individuals and entities are accredited investors for an aggregate purchase
price of $4,824,060 in cash.
    
 
   
    From January 1, 1993 to September 30, 1996, the Company issued options to
purchase 1,549,163 shares of Common Stock (of which options to purchase 57,750
shares of Common Stock subsequently have been cancelled) to employees and
consultants of the Company pursuant to the 1989 Option Plan, the 1993 Option
Plan and the 1993 Executive Option Plan. None of such options has been
exercised.
    
 
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
    (a) Exhibits
 
   
<TABLE>
<C>        <S>
      1.1  --Form of Underwriting Agreement
      3.1  --Certificate of Incorporation, as amended, of the Registrant
    **3.2  --By-Laws of the Registrant
      4.1  --Specimen Certificate for Common Stock, $0.0013 par value per share, of the
             Registrant
      5.1  --Opinion of Dewey Ballantine
   **10.1  --Form of Registration Rights Agreement
   **10.2  --1989 Non-Qualified Stock Option Plan
   **10.3  --1993 Stock Option Plan, as amended
   **10.4  --1993 Executive Stock Option Plan
   **10.5  --Amended 1996 Stock Incentive Plan
   **10.6  --Form of Indemnification Agreement
   **10.7  --Employment Agreement dated December 15, 1993 between the Registrant and Dr. Paul
             J. Maddon
   **10.8  --Letter dated August 25, 1994 between the Registrant and Dr. Robert J. Israel
   **10.9  --Sublease dated July 13, 1988 between the Registrant and Union Carbide Corporation
   +10.10  --gp120 Supply Agreement dated July 19, 1995 between the Registrant and E. I.
             DuPont De Nemours and Company, as amended October 27, 1995
   +10.11  --sCD4 Supply Agreement dated June 27, 1995 between the Registrant and E. I. DuPont
             De Nemours and Company
   +10.12  --Supply Agreement dated February 8, 1996 between the Registrant and Intracel
             Corporation
   +10.13  --License Agreement dated November 17, 1994 between the Registrant and
             Sloan-Kettering Institute for Cancer Research
   +10.14  --Clinical Trial Agreement dated December 12, 1994 between the Registrant and
             Sloan-Kettering Institute for Cancer Research
   +10.15  --QS-21 License and Supply Agreement dated August 31, 1995 between the Registrant
             and Aquila Biopharmaceuticals Inc.
   +10.16  --gp120 Sublicense Agreement dated March 17, 1995 between the Registrant and Aquila
             Biopharmaceuticals Inc.
   +10.17  --Cooperative Research and Development Agreement dated February 25, 1993 between
             the Registrant and the Centers for Disease Control and Prevention
   +10.18  --License Agreement dated March 1, 1989, as amended by a Letter Agreement dated
             March 1, 1989 and as amended by a Letter Agreement dated October 22, 1996 between
             the Registrant and the Trustees of Columbia University
</TABLE>
    
 
                                      II-3
<PAGE>
   
<TABLE>
<C>        <S>
   +10.19  --License Agreement dated June 25, 1996 between the Registrant and The Regents of
             the University of California
   +10.20  --KLH Supply Agreement dated July 1, 1996 between the Registrant and PerImmune,
             Inc.
   +10.21  --sCD4 Supply Agreement dated November 3, 1993 between the Registrant and E.I.
             DuPont De Nemours and Company
  **10.22  --Lease dated June 30, 1994 between the Registrant and Keren Limited Partnership
     11.1  --Statement of computation of loss per share for the years ended December 31, 1993,
             1994 and 1995
     11.2  --Statement of computation of loss per share for the nine months ended September
             30, 1995 and 1996
     11.3  --Pro forma statement of computation of loss per share
     23.1  --Consent of Coopers & Lybrand L.L.P.
     23.2  --Consent of Dewey Ballantine (contained in Exhibit 5.1)
   **24.1  --Power of Attorney (included on page II-5)
   **27.1  --Financial Data Schedule
</TABLE>
    
 
- ------------------------
 
   
**  Previously filed.
    
 
+  Confidential treatment requested as to certain portions, which portions are
    omitted and filed separately with the Commission.
 
    (b) Financial Statement Schedules
 
    All schedules have been omitted because they are not required or because the
required information is given in the Financial Statements or Notes thereto.
 
ITEM 17. UNDERTAKINGS
 
    The undersigned Registrant 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
of 1933 may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the foregoing provisions, or otherwise, the Registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the 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, 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 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
    of 1933, 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 of 1933, 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-4
<PAGE>
                                   SIGNATURES
 
   
    Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Amendment to the Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Tarrytown,
State of New York, on November 12, 1996.
    
 
                                PROGENICS PHARMACEUTICALS, INC.
 
                                BY:       /S/ PAUL J. MADDON, M.D., PH.D.
                                     -----------------------------------------
                                            Paul J. Maddon, M.D., Ph.D.
                                               Chairman of the Board,
                                       Chief Executive Officer and President
 
                               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
on November 12, 1996 in the capacities indicated:
    
 
   
          SIGNATURE                        TITLE                    DATE
- ------------------------------  ---------------------------  -------------------
 
                                Chairman of the Board,
              *                   Chief Executive Officer
- ------------------------------    and President (principal    November 12, 1996
 Paul J. Maddon, M.D., Ph.D.      executive officer)
 
                                Vice President, Finance and
              *                   Operations, Treasurer
- ------------------------------    (principal accounting and   November 12, 1996
      Robert A. McKinney          financial officer)
 
              *                 Director
- ------------------------------                                November 12, 1996
       Charles A. Baker
 
              *                 Director
- ------------------------------                                November 12, 1996
        Mark F. Dalton
 
              *                 Director
- ------------------------------                                November 12, 1996
    Stephen P. Goff, Ph.D.
 
              *                 Director
- ------------------------------                                November 12, 1996
    Elizabeth M. Greetham
 
                                      II-5
    
<PAGE>
<TABLE>
<CAPTION>
   
          SIGNATURE                        TITLE                    DATE
- ------------------------------  ---------------------------  -------------------
<S>                             <C>                          <C>
              *                 Director
- ------------------------------                                November 12, 1996
       Paul F. Jacobson
 
              *                 Director
- ------------------------------
  David A. Scheinberg, M.D.,                                  November 12, 1996
            Ph.D.
 
    
 
*By:                    /s/ ROBERT A. MCKINNEY
             ------------------------------------------
                         Robert A. McKinney
                       (As Attorney-in-Fact)
 
</TABLE>
                                     II-6
<PAGE>
                               INDEX TO EXHIBITS
 
   
<TABLE>
<CAPTION>
          EXHIBITS                                               DESCRIPTION                                      PAGE
- -----------------------------  -------------------------------------------------------------------------------  ---------
<C>                            <S>                                                                              <C>
                          1.1  --Form of Underwriting Agreement
 
                          3.1  --Certificate of Incorporation, as amended, of the Registrant
 
                        **3.2  --By-Laws of the Registrant
 
                          4.1  --Specimen Certificate for Common Stock, $.0013 par value per share, of the
                                Registrant
 
                          5.1  --Opinion of Dewey Ballantine
 
                       **10.1  --Form of Registration Rights Agreement
 
                       **10.2  --1989 Non-Qualified Stock Option Plan
 
                       **10.3  --1993 Stock Option Plan as amended
 
                       **10.4  --1993 Executive Stock Option Plan
 
                       **10.5  --Amended 1996 Stock Incentive Plan
 
                       **10.6  --Form of Indemnification Agreement
 
                       **10.7  --Employment Agreement dated December 15, 1993 between the Registrant and Dr.
                                Paul J. Maddon
 
                       **10.8  --Letter dated August 25, 1994 between the Registrant and Dr. Robert J. Israel
 
                       **10.9  --Sublease dated July 13, 1988 between the Registrant and Union Carbide
                                Corporation
 
                       +10.10  --gp120 Supply Agreement dated July 19, 1995 between the Registrant and E. I.
                                DuPont De Nemours and Company, as amended, October 27, 1995
 
                       +10.11  --sCD4 Supply Agreement dated June 27, 1995 between the Registrant and E. I.
                                DuPont De Nemours and Company
 
                       +10.12  --Supply Agreement dated February 8, 1996 between the Registrant and Intracel
                                Corporation
 
                       +10.13  --License Agreement dated November 17, 1994 between the Registrant and
                                Sloan-Kettering Institute for Cancer Research
 
                       +10.14  --Clinical Trial Agreement dated December 12, 1994 between the Registrant and
                                Sloan-Kettering Institute for Cancer Research
 
                       +10.15  --QS-21 License and Supply Agreement dated August 31, 1995 between the
                                Registrant and Cambridge Biotech Corporation
 
                       +10.16  --gp120 Sublicense Agreement dated March 17, 1995 between the Registrant and
                                Cambridge Biotech Corporation
 
                       +10.17  --Cooperative Research and Development Agreement dated February 25, 1993
                                between the Registrant and the Centers for Disease Control and Prevention
 
                       +10.18  --License Agreement dated March 1, 1989, as amended by a Letter Agreement dated
                                March 1, 1989 and as amended by a Letter Agreement dated October 22, 1996
                                between the Registrant and the Trustees of Columbia University
 
                       +10.19  --License Agreement dated June 25, 1996 between the Registrant and The Regents
                                of the University of California
 
                       +10.20  --KLH Supply Agreement dated July 1, 1996 between the Registrant and PerImmune,
                                Inc.
</TABLE>
    
<PAGE>
   
<TABLE>
<C>                            <S>                                                                              <C>
                       +10.21  --sCD4 Supply Agreement dated November 3, 1993 between the Registrant and E.I.
                                DuPont De Nemours and Company
 
                      **10.22  --Lease dated June 30, 1994 between the Registrant and Keren Limited
                                Partnership
 
                         11.1  --Statement of computation of loss per share for the years ended December 31,
                                1993, 1994 and 1995
 
                         11.2  --Statement of computation of loss per share for the nine months ended
                                September 30, 1995 and 1996
 
                         11.3  --Pro forma statement of computation of loss per share
 
                         23.1  --Consent of Coopers & Lybrand L.L.P.
 
                         23.2  --Consent of Dewey Ballantine (contained in Exhibit 5.1)
 
                       **24.1  --Power of Attorney (included on page II-5)
 
                       **27.1  --Financial Data Schedule
</TABLE>
    
 
- ------------------------
 
   
**  Previously filed.
    
 
+  Confidential treatment requested as to certain portions, which portions are
    omitted and filed separately with the Commission.


<PAGE>
                                                                   EXHIBIT 1.1


                                                         H&D DRAFT
                                                          11/11/96



                         2,000,000 Shares

                  PROGENICS PHARMACEUTICALS, INC.

                           Common Stock

                      UNDERWRITING AGREEMENT


                                             ____________, 1996



Oppenheimer & Co., Inc.
Vector Securities International, Inc.
c/o Oppenheimer & Co., Inc.
Oppenheimer Tower
World Financial Center
New York, New York 10281

On behalf of the Several Underwriters
named on Schedule I attached hereto


Ladies and Gentlemen:

     Progenics Pharmaceuticals, Inc., a Delaware corporation (the
"Company"), proposes to sell to you and the other underwriters
named on Schedule I to this Agreement (the "Underwriters"), for
whom you are acting as Representatives, an aggregate of 2,000,000
shares (the "Firm Shares") of the Company's Common Stock, $0.0013
par value (the "Common Stock").  In addition, the Company proposes
to grant to the Underwriters an option to purchase up to an
additional 300,000 shares (the "Option Shares") of Common Stock
from it for the purpose of covering over-allotments in connection
with the sale of the Firm Shares.  The Firm Shares and the Option
Shares are together called the "Shares."


     1.   SALE AND PURCHASE OF THE SHARES.  On the basis of the
representations, warranties and agreements contained in, and
subject to the terms and conditions of, this Agreement:

          (a)  The Company agrees to sell to each of the
     Underwriters, and each of the Underwriters agrees, severally
     and not jointly, to purchase from the Company, at $_____ per
     share (the "Initial Price"), the number of Firm Shares set
     forth opposite the name of such Underwriter on Schedule I to
     this Agreement.



<PAGE>


          (b)  The Company grants to the several Underwriters an
     option to purchase, severally and not jointly, all or any
     part of the Option Shares at the Initial Price.  The number
     of Option Shares to be purchased by each Underwriter shall be
     the same percentage (adjusted by the Representatives to
     eliminate fractions) of the total number of Option Shares to
     be purchased by the Underwriters as such Underwriter is
     purchasing of the Firm Shares.  Such option may be exercised
     only to cover over-allotments in the sales of the Firm Shares
     by the Underwriters and may be exercised in whole or in part
     at any time on or before 12:00 noon, New York City time, on
     the business day before the Firm Shares Closing Date (as
     defined below), and only once thereafter within 30 days after
     the date of this Agreement, in each case upon written or
     telegraphic notice, or verbal or telephonic notice confirmed
     by written or telegraphic notice, by the Representatives to
     the Company no later than 12:00 noon, New York City time, on
     the business day before the Firm Shares Closing Date or at
     least two business days before the Option Shares Closing Date
     (as defined below), as the case may be, setting forth the
     number of Option Shares to be purchased and the time and date
     (if other than the Firm Shares Closing Date) of such
     purchase.  

     2.   DELIVERY AND PAYMENT.  Delivery by the Company of the
Firm Shares to the Representatives for the respective accounts of
the Underwriters, and payment of the purchase price by certified
or official bank check or checks payable in New York Clearing
House (next day) funds to the Company, shall take place at the
offices of Dewey Ballantine, 1301 Avenue of the Americas, New
York, New York  10019, at 10:00 a.m., New York City time, on the
third business day following the date of this Agreement, or at
such time on such other date, not later than 10 business days
after the date of this Agreement, as shall be agreed upon by the
Company and the Representatives (such time and date of delivery
and payment are called the "Firm Shares Closing Date").

     In the event the option with respect to the Option Shares is
exercised, delivery by the Company of the Option Shares to the
Representatives for the respective accounts of the Underwriters
and payment of the purchase price by certified or official bank
check or checks payable in New York Clearing House (next day)
funds to the Company shall take place at the offices of Dewey
Ballantine specified above at the time and on the date (which may
be the same date as, but in no event shall be earlier than, the
Firm Shares Closing Date) specified in the notice referred to in
Section 1(b) (such time and date of delivery and payment are
called the "Option Shares Closing Date").  The Firm Shares Closing
Date and the Option Shares Closing Date are called, individually,
a "Closing Date" and, together, the "Closing Dates."



                                -2- 



<PAGE>


     Certificates evidencing the Shares shall be registered in
such names and shall be in such denominations as the
Representatives shall request at least two full business days
before the Firm Shares Closing Date or, in the case of Option
Shares, on the day of notice of exercise of the option as
described in Section 1(b) and shall be made available to the
Representatives for checking and packaging, at such place as is
designated by the Representatives, on the full business day before
the Firm Shares Closing Date (or the Option Shares Closing Date in
the case of the Option Shares).

     3.   REGISTRATION STATEMENT AND PROSPECTUS: PUBLIC OFFERING.
The Company has prepared in conformity with the requirements of
the Securities Act of 1933, as amended (the "Securities Act"), and
the published rules and regulations thereunder (the "Rules")
adopted by the Securities and Exchange Commission (the
"Commission") a registration statement on Form S-1 (No.
333-13627), including a preliminary prospectus relating to the
Shares, and has filed with the Commission the Registration
Statement (as hereinafter defined) and such amendments thereof as
may have been required to the date of this Agreement.  Copies of
such Registration Statement (including all amendments thereof) and
of the related preliminary prospectus have heretofore been
delivered by the Company to you.  The term "preliminary
prospectus" means any preliminary prospectus (as described in Rule
430 of the Rules) included at any time as a part of the
Registration Statement.  The Registration Statement as amended at
the time and on the date it becomes effective (the "Effective
Date"), including all exhibits and information, if any, deemed to
be part of the Registration Statement pursuant to Rule 424(b) and
Rule 430A of the Rules, together with any registration statement
for the same offering filed by the Company that is to be effective
upon filing pursuant to Rule 462(b) of the Securities Act, is
called the "Registration Statement." The term "Prospectus" means
the prospectus in the form first used to confirm sales of the
Shares (whether such prospectus was included in the Registration
Statement at the time of effectiveness or was subsequently filed
with the Commission pursuant to Rule 424(b) of the Rules).  

     The Company understands that the Underwriters propose to make
a public offering of the Shares, as set forth in and pursuant to
the Prospectus, as soon after the Effective Date and the date of
this Agreement as the Representatives deem advisable.  The Company
hereby confirms that the Underwriters and dealers have been
authorized to distribute or cause to be distributed each
preliminary prospectus and are authorized to distribute the
Prospectus (as from time to time amended or supplemented if the
Company furnishes amendments or supplements thereto to the
Underwriters).




                                -3- 



<PAGE>


     4.   REPRESENTATIONS AND WARRANTIES OF THE COMPANY.  The
Company hereby represents and warrants to each Underwriter as
follows:

          (a)  On the Effective Date the Registration Statement
     complied, and on the date of the Prospectus, on the date any
     post-effective amendment to the Registration Statement shall
     become effective, on the date any supplement or amendment to
     the Prospectus is filed with the Commission and on each
     Closing Date, the Registration Statement and the Prospectus
     (and any amendment thereof or supplement thereto) will
     comply, in all material respects, with the applicable
     provisions of the Securities Act and the Rules and the
     Securities Exchange Act of 1934, as amended (the "Exchange
     Act"), and the rules and regulations of the Commission
     thereunder; the Registration Statement did not, as of the
     Effective Date, contain any untrue statement of a material
     fact or omit to state any material fact required to be stated
     therein or necessary in order to make the statements therein
     not misleading; and on the other dates referred to above
     neither the Registration Statement nor the Prospectus, nor
     any amendment thereof or supplement thereto, will contain any
     untrue statement of a material fact or will omit to state any
     material fact required to be stated therein or necessary in
     order to make the statements therein not misleading.  When
     any related preliminary prospectus was first filed with the
     Commission (whether filed as part of the Registration
     Statement or any amendment thereto or pursuant to Rule 424(a)
     of the Rules) and when any amendment thereof or supplement
     thereto was first filed with the Commission, such preliminary
     prospectus as amended or supplemented complied in all
     material respects with the applicable provisions of the
     Securities Act and the Rules and did not contain any untrue
     statement of a material fact or omit to state any material
     fact required to be stated therein or necessary in order to
     make the statements therein not misleading.  Notwithstanding
     the foregoing, the Company makes no representation or
     warranty as to the last paragraph on the cover page of the
     Prospectus, the paragraph with respect to stabilization on
     the inside front cover page of the Prospectus, the concession
     and reallowance figures appearing under the caption
     "Underwriting" in the Prospectus and the last sentence of the
     third full paragraph under the caption "Underwriting" in the
     Prospectus regarding the exercise of discretionary authority
     by the Underwriters.  The Company acknowledges that the
     statements referred to in the previous sentence constitute
     the only information furnished in writing by the
     Representatives on behalf of the Underwriters specifically
     for inclusion in the Registration Statement, any preliminary
     prospectus or the Prospectus.



                                -4- 


<PAGE>


          (b)  All contracts and other documents required to be
     filed as exhibits to the Registration Statement have been
     filed with the Commission as exhibits to the Registration
     Statement.  

          (c)  The financial statements of the Company (including
     all notes and schedules thereto) included in the Registration
     Statement and Prospectus present fairly the financial
     position, results of operations and cash flows and the
     stockholders' equity and the other information purported to
     be shown therein of the Company at the respective dates and
     for the respective periods to which they apply; and such
     financial statements have been prepared in conformity with
     generally accepted accounting principles, consistently
     applied throughout the periods involved, and all adjustments
     necessary for a fair presentation of the results for such
     periods have been made; PROVIDED, HOWEVER, that the interim
     financial statements contained in the Registration Statement
     and Prospectus shall be subject to normal year-end
     adjustments in accordance with generally accepted accounting
     principles.

          (d)  Coopers & Lybrand LLP, whose reports are filed with
     the Commission as a part of the Registration Statement, are
     and, during the periods covered by their reports, were
     independent public accountants as required by the Securities
     Act and the Rules.

          (e)  The Company has been duly incorporated and is
     validly existing as a corporation in good standing under the
     laws of the State of Delaware.  The Company has no
     subsidiaries and does not control, directly or indirectly,
     any corporation, partnership, joint venture, association or
     business.  The Company is duly qualified and in good standing
     as a foreign corporation in each jurisdiction in which the
     character or location of its assets or properties (owned,
     leased or licensed) or the nature of its business makes such
     qualification necessary except for such jurisdictions where
     the failure to so qualify would not have a material adverse
     effect on the assets or properties, business, results of
     operations or financial condition of the Company.  Except as
     disclosed in the Registration Statement and the Prospectus,
     the Company does not own, lease or license any asset or
     property or conduct any business outside the United States of
     America.  The Company has all requisite corporate power and
     authority, and all necessary authorizations, approvals,
     consents, orders, licenses, certificates and permits of and
     from all governmental or regulatory bodies or any other
     person or entity, to own, lease and license its assets and
     properties and conduct its businesses as now being conducted



                                -5- 


<PAGE>


     and as described in the Registration Statement and the
     Prospectus except for such authorizations, approvals,
     consents, orders, material licenses, certificates and permits
     the failure to so obtain would not have a material adverse
     effect upon the assets or properties, business, results of
     operations, prospects or condition (financial or otherwise)
     of the Company; no such authorization, approval, consent,
     order, license, certificate or permit contains a materially
     burdensome restriction other than as disclosed in the
     Registration Statement and the Prospectus; and the Company
     has all such corporate power and authority, and such
     authorizations, approvals, consents, orders, licenses,
     certificates and permits to enter into, deliver and perform
     this Agreement and to issue and sell the Shares (except as
     may be required under state and foreign Blue Sky laws).  To
     the Company's knowledge, all of the properties now or
     formerly owned or leased by the Company or any subsidiary,
     all research and manufacturing operations conducted thereon
     (including discharges and emissions therefrom) and all
     research and manufacturing equipment now or formerly used at
     said properties, have been and are in compliance with all
     Federal, state, local and foreign statutes, ordinances,
     regulations, rules and standards concerning or relating to
     industrial hygiene and the protection of health, safety,
     welfare and the environment (collectively, "the Environmental
     Laws"), except to the extent that any failure to be in
     compliance, singly or in the aggregate, would not have a
     material adverse effect upon the assets or properties,
     business, results of operations, prospects or condition
     (financial or otherwise) of the Company.  The Company has not
     received notice, and does not have knowledge, of any claim,
     demand, investigation, regulatory action, suit or other
     action instituted or threatened against it or said property
     relating to any of the Environmental Laws.

          (f)  The Company has filed with the U.S. Food and Drug
     Administration (the "FDA"), and all applicable foreign, state
     and local regulatory bodies for, and received approval of,
     all registrations, applications, licenses, requests for
     exemptions, permits and other regulatory authorizations
     material to the conduct of the Company's business as it is
     now conducted; the Company is in compliance in all material
     respects with all such registrations, applications, licenses,
     requests for exemptions, permits and other regulatory
     authorizations, and all applicable FDA, foreign, state and
     local rules and regulations; the Company has no reason to
     believe that any party granting any such registration,
     application, license, request for exemption, permit or other
     authorization is considering limiting, suspending or revoking
     the same.  



                                -6- 


<PAGE>


          (g)  The human clinical trials, animal studies and other
     preclinical tests conducted by the Company or in which the
     Company has participated that are described in the
     Registration Statement and Prospectus or the results of which
     are referred to in the Registration Statement or Prospectus,
     and such studies and tests conducted on behalf of the Company
     (including but not limited to studies and tests conducted
     under institutional INDs filed by Memorial Sloan-Kettering
     Cancer Center ("Sloan-Kettering"), were and, if still
     pending, are being conducted in all material respects in
     accordance with experimental protocols, procedures and
     controls generally used by qualified experts in the
     preclinical or clinical study of products comparable to those
     being developed by the Company; the descriptions of the
     results of such studies, tests and trials contained in the
     Registration Statement and Prospectus are accurate and
     complete in all material respects, and the Company has no
     knowledge of any other trials, studies or tests, the results
     of which reasonably call into question the results described
     or referred to in the Registration Statement and Prospectus;
     the Company has not received any notices or correspondence
     from the FDA or any other governmental agency requiring the
     termination, suspension or modification (other than such
     modifications as are normal in the regulatory process) of any
     animal studies, preclinical tests or clinical trials
     conducted by or on behalf of the Company (including but not
     limited to studies and tests conducted under institutional
     INDs filed by Sloan-Kettering) or in which the Company has
     participated that are described in the Registration Statement
     or Prospectus or the results of which are referred to in the
     Registration Statement or Prospectus.  

          (h)  The Company owns or possesses adequate and
     enforceable rights to use all patents, patent applications,
     trademarks, trademark applications, trade names, service
     marks, copyrights, copyright applications, licenses,
     know-how, proprietary techniques, including processes and
     substances, and other similar rights and proprietary
     knowledge (collectively, "Intangibles") necessary for the
     conduct of its business as described in the Registration
     Statement and the Prospectus.  The Company has not received
     any notice of, and to its best knowledge is not aware of, any
     infringement of or conflict with asserted rights of others
     with respect to any Intangibles which, singly or in the
     aggregate, if the subject of an unfavorable decision, ruling
     or finding, would have a material adverse effect upon the
     assets or properties, business, results of operations,
     prospects or condition (financial or otherwise) of the
     Company.  The Company is not aware of any infringement of any
     of the Company's Intangibles by any third party which could



                                -7- 


<PAGE>


     have a material adverse effect upon the assets or properties,
     business, results of operations, prospects or condition
     (financial or otherwise) of the Company.

          (i)  The Company has good title to each of the items of
     personal property which are reflected in the financial
     statements referred to in Section 4(c) or are referred to in
     the Registration Statement and the Prospectus as being owned
     by it and valid and enforceable leasehold interests in each
     of the items of real and personal property which are referred
     to in the Registration Statement and the Prospectus as being
     leased by it, in each case free and clear of all liens,
     encumbrances, claims, security interests and defects, other
     than those described in the Registration Statement and the
     Prospectus and those which do not and will not have a
     material adverse effect upon the assets or properties,
     business, results of operations or financial condition of the
     Company.

          (j)  There is no litigation or governmental or other
     proceeding or investigation before any court or before or by
     any public body or board pending or, to the Company's best
     knowledge, threatened (and the Company does not know of any
     basis therefor) against, or involving the assets, properties
     or business of, the Company which, if determined adversely to
     the Company, would materially adversely affect the value or
     the operation of any such assets or properties or the
     business, results of operations, prospects or condition
     (financial or otherwise) of the Company.

          (k)  Subsequent to the respective dates as of which
     information is given in the Registration Statement and the
     Prospectus, except as described therein, (i) there has not
     been any material adverse change in the assets or properties,
     business, results of operations, prospects or condition
     (financial or otherwise), of the Company, whether or not
     arising from transactions in the ordinary course of business;
     (ii) the Company has not sustained any material loss or
     interference with its assets, businesses or properties
     (whether owned or leased) from fire, explosion, earthquake,
     flood or other calamity, whether or not covered by insurance,
     or from any labor dispute or any court or legislative or
     other governmental action, order or decree; and (iii) since
     the date of the latest balance sheet included in the
     Registration Statement and the Prospectus, except as
     reflected in the Registration Statement or the Prospectus,
     the Company has not (a) issued any securities or incurred any
     liability or obligation, direct or contingent, for borrowed
     money, except such liabilities or obligations incurred in the
     ordinary course of business, (b) entered into any transaction



                                -8- 


<PAGE>


     not in the ordinary course of business or (c) declared or
     paid any dividend or made any distribution on any shares of
     its stock or redeemed, purchased or otherwise acquired or
     agreed to redeem, purchase or otherwise acquire any shares of
     its stock.

          (l)  There is no document or contract of a character
     required to be described in the Registration Statement or
     Prospectus or to be filed as an exhibit to the Registration
     Statement which is not described or filed as required.  Each
     agreement listed in the exhibits to the Registration
     Statement is in full force and effect and is valid and
     enforceable by and against the Company in accordance with its
     terms, assuming the due authorization, execution and delivery
     thereof by each of the other parties thereto.  Neither the
     Company, nor, to the best of the Company's knowledge, any
     other party is in default in the observance or performance of
     any term or obligation to be performed by it under any such
     agreement, and no event has occurred which with notice or
     lapse of time or both would constitute such a default, in any
     such case which default or event would have a material
     adverse effect on the assets or properties, business, results
     of operations, prospects or condition (financial or
     otherwise) of the Company.  No default exists, and no event
     has occurred which with notice or lapse of time or both would
     constitute a default, in the due performance and observance
     of any term, covenant or condition, by the Company of any
     other agreement or instrument to which the Company is a party
     or by which it or its properties or business may be bound or
     affected which default or event would have a material adverse
     effect on the assets or properties, business, results of
     operations, prospects or condition (financial or otherwise)
     of the Company.

          (m)  The Company is not in violation of any term or
     provision of its charter or by-laws or of any franchise,
     license, permit, judgment, decree, order, statute, rule or
     regulation, where the consequences of such violation would
     have a material adverse effect on the assets or properties,
     business, results of operations, prospects or condition
     (financial or otherwise) of the Company.

          (n)  Neither the execution, delivery and performance of
     this Agreement by the Company nor the consummation of any of
     the transactions contemplated hereby (including, without
     limitation, the issuance and sale by the Company of the
     Shares) will give rise to a right to terminate or accelerate
     the due date of any payment due under, or conflict with or
     result in the breach of any term or provision of, or
     constitute a default (or an event which with notice or lapse



                                -9- 


<PAGE>


     of time or both would constitute a default) under, or require
     any consent or waiver under, or result in the execution or
     imposition of any lien, charge or encumbrance upon any
     properties or assets of the Company pursuant to the terms of,
     any indenture, mortgage, deed of trust or other agreement or
     instrument to which the Company is a party or by which it or
     any of its properties or businesses is bound, or any
     franchise, license, permit, judgment, decree, order, statute,
     rule or regulation applicable to the Company or violate any
     provision of the charter or by-laws of the Company, except
     for such consents or waivers which have already been obtained
     and are in full force and effect.

          (o)  The Company has an authorized and outstanding
     capital stock as set forth under the caption "Capitalization"
     in the Prospectus.  All of the outstanding shares of Common
     Stock have been duly and validly issued and are fully paid
     and nonassessable and none of them was issued in violation of
     any preemptive or other similar right.  The Shares, when
     issued and sold pursuant to this Agreement, will be duly and
     validly issued, fully paid and nonassessable and none of them
     will be issued in violation of any preemptive or other
     similar right.  Except as disclosed in the Registration
     Statement and the Prospectus, there is no outstanding option,
     warrant or other right calling for the issuance of, and there
     is no commitment, plan or arrangement to issue, any share of
     stock of the Company or any security convertible into, or
     exercisable or exchangeable for, such stock.  The Common
     Stock and the Shares conform in all material respects to all
     statements in relation thereto contained in the Registration
     Statement and the Prospectus.

          (p)  No holder of any security of the Company has the
     right to have any security owned by such holder included in
     the Registration Statement or to demand registration of any
     security owned by such holder during the period ending 180
     days after the date of this Agreement.  Each of the directors
     and executive officers of the Company, and other stockholders
     of the Company who beneficially own, in the aggregate,
              shares of Common Stock (the "Locked-up Holders")
     either have agreed with the Company or delivered to the
     Representatives his enforceable written agreement that he
     will not, for a period of 180 days after the date of this
     Agreement, offer for sale, sell, distribute, grant any option
     for the sale of, or otherwise dispose of, directly or
     indirectly, or exercise any registration rights with respect
     to, any shares of Common Stock (or any securities convertible
     into, exercisable for, or exchangeable for any shares of
     Common Stock) owned by him, without the prior written consent
     of Oppenheimer & Co., Inc. ("Oppenheimer").



                                   -10- 


<PAGE>


     Oppenheimer agrees to notify Vector Securities International,
     Inc. of its intention to consent to any of the transactions
     prohibited by this paragraph.  

          (q)  All necessary corporate action has been duly and
     validly taken by the Company to authorize the execution,
     delivery and performance of this Agreement and the issuance
     and sale of the Shares by the Company.  This Agreement has
     been duly and validly authorized, executed and delivered by
     the Company and constitutes the legal, valid and binding
     obligation of the Company enforceable against the Company in
     accordance with its terms, except (A) as the enforceability
     thereof may be limited by bankruptcy, insolvency,
     reorganization, moratorium or other similar laws affecting
     the enforcement of creditors' rights generally and by general
     equitable principles and (B) to the extent that rights to
     indemnity or contribution under this Agreement may be limited
     by Federal and state securities laws or the public policy
     underlying such laws.

          (r)  The Company is not involved in any labor dispute
     nor, to the knowledge of the Company, is any such dispute
     threatened, which dispute would have a material adverse
     effect on the assets or properties, business, results of
     operations, prospects or condition (financial or otherwise)
     of the Company.

          (s)  No transaction has occurred between or among the
     Company and any of its officers or directors or any affiliate
     or affiliates of any such officer or director that is
     required to be described in and is not described in the
     Registration Statement and the Prospectus.

          (t)  The Company has not taken, nor will it take,
     directly or indirectly, any action designed to or which might
     reasonably be expected to cause or result in, or which has
     constituted or which might reasonably be expected to
     constitute, the stabilization or manipulation of the price of
     the Common Stock to facilitate the sale or resale of any of
     the Shares.

          (u)  The Company has filed all Federal, state, local and
     foreign tax returns which are required to be filed by it
     through the date hereof, or has received extensions thereof,
     and has paid all taxes shown on such returns and all
     assessments received by it to the extent that the same are
     material and have become due.

          (v)  The Shares have been duly authorized for quotation
     on Nasdaq National Market.



                               -11- 


<PAGE>
          (w)  The Company has complied with all of the
     requirements and filed the required forms as specified in
     Florida Statutes Section 517.075.

     5.   CONDITIONS OF THE UNDERWRITERS OBLIGATIONS.  The
obligations of the Underwriters under this Agreement are several
and not joint.  The respective obligations of the Underwriters to
purchase the Shares are subject to each of the following terms and
conditions:

          (a)  The Prospectus shall have been timely filed with
     the Commission in accordance with Section 6(A)(a) of this
     Agreement.

          (b)  No order preventing or suspending the use of any
     preliminary prospectus or the Prospectus shall have been or
     shall be in effect and no order suspending the effectiveness
     of the Registration Statement shall be in effect and no
     proceedings for such purpose shall be pending before or
     threatened by the Commission, and any requests for additional
     information on the part of the Commission (to be included in
     the Registration Statement or the Prospectus or otherwise)
     shall have been complied with to the satisfaction of the
     Representatives.  

          (c)  The representations and warranties of the Company
     contained in this Agreement and in the certificates delivered
     pursuant to Section 5(d) shall be true and correct when made
     and on and as of each Closing Date as if made on such date
     and the Company shall have performed all covenants and
     agreements and satisfied all the conditions contained in this
     Agreement required to be performed or satisfied by it at or
     before such Closing Date.

          (d)  The Representatives shall have received on each
     Closing Date a certificate, addressed to the Representatives
     and dated such Closing Date, of the chief executive or chief
     operating officer and the chief financial officer or chief
     accounting officer of the Company to the effect that the
     signers of such certificate have carefully examined the
     Registration Statement, the Prospectus and this Agreement and
     that the representations and warranties of the Company in
     this Agreement are true and correct on and as of such Closing
     Date with the same effect as if made on such Closing Date and
     the Company has performed all covenants and agreements and
     satisfied all conditions contained in this Agreement required
     to be performed or satisfied by it at or prior to such
     Closing Date.


                               -12- 


<PAGE>


          (e)  The Representatives shall have received on the
     Effective Date, at the time this Agreement is executed and on
     each Closing Date a signed letter from Coopers & Lybrand LLP
     addressed to the Representatives and dated, respectively, the
     Effective Date, the date of this Agreement and each such
     Closing Date, in form and substance reasonably satisfactory
     to the Representatives.  

          (f)  The Representatives shall have received on each
     Closing Date from Dewey Ballantine, counsel for the Company,
     an opinion, addressed to the Representatives and dated such
     Closing Date, and stating in effect that:

               (i)  The Company has been duly organized and is
          validly existing as a corporation in good standing under
          the laws of the State of Delaware.  The Company is duly
          qualified and in good standing as a foreign corporation
          in each jurisdiction in which the character or location
          of its assets or properties (owned, leased or licensed)
          or the nature of its businesses makes such qualification
          necessary, except for such jurisdictions where the
          failure to so qualify would not have a material adverse
          effect on the assets or properties, business, results of
          operations, prospects or condition (financial or
          otherwise) of the Company.  

               (ii)  The Company has all requisite corporate power
          and authority to own, lease and license its assets and
          properties and conduct its business as described in the
          Registration Statement and the Prospectus; and the
          Company has all requisite corporate power and authority
          and all necessary authorizations, approvals, consents,
          orders, licenses, certificates and permits to enter
          into, deliver and perform this Agreement and to issue
          and sell the Shares other than those required under
          state and foreign Blue Sky laws.

               (iii)  The authorized and issued capital stock of
          the Company is as set forth in the Registration
          Statement and the Prospectus; the certificates
          evidencing the Shares are in due and proper legal form
          and have been duly authorized for issuance by the
          Company; all of the outstanding shares of Common Stock
          of the Company have been duly and validly authorized and
          have been duly and validly issued and are fully paid and
          nonassessable and none of them was issued in violation
          of any preemptive or other similar right, except for
          those violations which have since been validly waived.
          The Shares when issued and sold pursuant to this
          Agreement will be duly and validly issued, outstanding,


                               -13- 


<PAGE>

          fully paid and nonassessable and none of them will have
          been issued in violation of any preemptive or other
          similar right.  To the best of such counsel's knowledge,
          except as disclosed in the Registration Statement and
          the Prospectus, there is no outstanding option, warrant
          or other right calling for the issuance of, and no
          commitment, plan or arrangement to issue, any share of
          stock of the Company or any security convertible into,
          exercisable for, or exchangeable for stock of the
          Company.  The Common Stock and the Shares conform in all
          material respects to the descriptions thereof contained
          in the Registration Statement and the Prospectus.  

               (iv)  To the best of such counsel's knowledge, no
          holder of any security of the Company has the right to
          have any security owned by such holder included in the
          Registration Statement or, except as described in the
          Registration Statement, to demand registration of any
          security during the period ending 180 days after the
          Effective Date, except for those rights which have been
          validly waived.

               (v)  All necessary corporate action has been duly
          and validly taken by the Company to authorize the
          execution, delivery and performance of this Agreement
          and the issuance and sale of the Shares.  This Agreement
          has been duly and validly authorized, executed and
          delivered by the Company.  

               (vi)  Neither the execution, delivery and
          performance of this Agreement by the Company nor the
          consummation of any of the transactions contemplated
          hereby (including, without limitation, the issuance and
          sale by the Company of the Shares) will give rise to a
          right to terminate or accelerate the due date of any
          payment due under, or conflict with or result in the
          breach of any term or provision of, or constitute a
          default (or any event which with notice or lapse of
          time, or both, would constitute a default) under, or
          require consent or waiver under, or result in the
          execution or imposition of any lien, charge or
          encumbrance upon any properties or assets of the Company
          pursuant to the terms of any indenture, mortgage, deed
          of trust, note or other agreement or instrument known to
          such counsel and to which the Company is a party or by
          which it or any of its properties or businesses is
          bound, or any franchise, license, permit, judgment,
          decree, order, statute, rule or regulation known to such
          counsel or violate any provision of the charter or
          by-laws of the Company.


                               -14- 

<PAGE>

                (vii)  No consent, approval, authorization or order
          of any court or governmental agency or body is required
          for the performance of this Agreement by the Company or
          the consummation of the transactions contemplated
          hereby, including without limitation the sale of the
          Shares, except such as have been obtained under the
          Securities Act and such as may be required under state
          securities or Blue Sky laws in connection with the
          purchase and distribution of the Shares by the several
          Underwriters.  

               (viii)  To the best of such counsel's knowledge,
          there is no litigation or governmental or other
          proceeding or investigation, before any court or before
          or by any public body or board pending or threatened
          against, or involving the assets, properties or
          businesses of, the Company which, if determined
          adversely to the Company, would have a material adverse
          effect upon the assets or properties, business, results
          of operations, prospects or condition (financial or
          otherwise) of the Company.

               (ix)  The statements in the Prospectus under the
          captions "Risk Factors - Availability of Materials";
          "Risk Factors - Dependence on Third Parties; "Risk
          Factors - Control by Existing Stockholders; Anti-
          Takeover Provisions"; "Risk Factors - Future Sales of
          Common Stock; Registration Rights; Possible Adverse
          Effect on Future Market Price"; "Business - Research and
          Development Collaborations"; "Business - Government
          Grants"; "Business -- Patents and Proprietary
          Technology" (describing the Columbia License Agreement
          (as defined below) and the patents and patent
          applications licensed to the Company thereby); "Certain
          Transactions"; "Description of Capital Stock"; and
          "Shares Eligible for Future Sale", insofar as such
          statements constitute a summary of documents referred to
          therein or matters of law, are fair summaries in all
          material respects and accurately present in all material
          respects the information called for with respect to such
          documents and matters.  All contracts and other
          documents known to such counsel and required to be filed
          as exhibits to, or described in, the Registration
          Statement have been so filed with the Commission or are
          fairly described in the Registration Statement, as the
          case may be.  

               (x)  The Registration Statement, all preliminary
          prospectuses and the Prospectus and each amendment or
          supplement thereto (except for the financial statements



                                      -15- 

<PAGE>


          and schedules and other financial and statistical data
          included therein, as to which such counsel need not
          express an opinion) comply as to form in all material
          respects with the requirements of the Securities Act and
          the Rules.  

               (xi)  The Registration Statement has become
          effective under the Securities Act, and, to the best of
          such counsel's knowledge, no stop order suspending the
          effectiveness of the Registration Statement has been
          issued and no proceedings for that purpose have been
          instituted or are threatened, pending or contemplated.  

               (xii)  All necessary corporate action has been duly
          and validly taken by the Company to authorize the
          execution, delivery and performance of the License
          Agreement dated March 1, 1989, as amended by a Letter
          Agreement dated March 1, 1989, and as amended by a
          Letter Agreement dated October 22, 1996, between the
          Company and the Trustees of Columbia University.  The
          Columbia License Agreement (the "Columbia License
          Agreement") has been duly and validly authorized,
          executed and delivered by the Company.

               (xiii)  To the best of such counsel's knowledge,
          neither the Company nor Columbia has received any notice
          of infringement or of conflict with asserted rights of
          others with respect to any patents, patent applications,
          trademarks, trademark applications, trade names, service
          marks, copyrights, copyright applications, licenses or
          know-how, proprietary techniques, including processes
          and substances, other similar rights and proprietary
          knowledge relating to the patents and patent
          applications licensed to the Company under the Columbia
          License Agreement (such patents and patent applications
          being collectively referred to herein as the "Columbia
          Licensed Patents"), which could result in any material
          adverse effect upon the Company.

                (xiv)  To the best of such counsel's knowledge,
          there are no legal or governmental proceedings pending
          relating to the Columbia Licensed Patents, other than
          review of pending applications for patents, and to the
          best of such counsel's knowledge no such proceedings are
          threatened or contemplated by governmental authorities
          or others.

     To the extent deemed advisable by such counsel, they may rely
as to matters of fact on certificates of responsible officers of
the Company and public officials and on the opinions of other



                                      -16- 

<PAGE>

counsel satisfactory to the Representatives as to matters which
are governed by laws other than the laws of the State of New York,
the General Corporation Law of the State of Delaware and the
Federal laws of the United States; provided that such counsel
shall state that in their opinion the Underwriters and they are
justified in relying on such other opinions.  Copies of such
certificates and other opinions shall be furnished to the
Representatives and counsel for the Underwriters.  

     In addition, such counsel shall state that such counsel has
participated in conferences with officers and other
representatives of the Company, representatives of the
Representatives and representatives of the independent certified
public accountants of the Company, at which conferences the
contents of the Registration Statement and the Prospectus and
related matters were discussed and, although such counsel is not
passing upon and does not assume any responsibility for the
accuracy, completeness or fairness of the statements contained in
the Registration Statement and the Prospectus (except as specified
in the foregoing opinion), on the basis of the foregoing, no facts
have come to the attention of such counsel which lead such counsel
to believe that the Registration Statement at the time it became
effective (except with respect to the financial statements and
notes and schedules thereto and other financial data, as to which
such counsel need express no belief) contained any untrue
statement of a material fact or omitted to state a material fact
required to be stated therein or necessary to make the statements
therein not misleading, or that the Prospectus as amended or
supplemented (except with respect to the financial statements and
notes and schedules thereto and other financial data, as to which
such counsel need make no statement) on the date thereof contained
any untrue statement of a material fact or omitted to state a
material fact necessary in order to make the statements therein,
in the light of the circumstances under which they were made, not
misleading.

     (g)  The Representatives shall have received on each Closing
Date from Cooper & Dunham, patent counsel for the Company, an
opinion addressed to the Representatives and dated such Closing
Date, to the effect that such counsel is familiar with the
technology used by the Company in its business and has read the
portions of the Registration Statement and the Prospectus headed:
"Risk Factors - Dependence on and Uncertainty of Protection of
Patents and Proprietary Rights" and "Business - Patents and
Proprietary Technology" (collectively, the "Technology Portion"),
and that, except to the extent that the following opinions relate
to the Company's ganglioside conjugate vaccine technology and
products as to which such counsel provides no opinion:





                                    -17-


<PAGE>


          (i)  such counsel has no knowledge of any facts which
     would preclude the Company from having clear title to the
     Company's patents or patent applications referenced in the
     Technology Portion.  To the best of such counsel's knowledge,
     the Company does not lack and will not be unable to obtain
     any rights or licenses to use any patent or know-how
     necessary to conduct the business now conducted or proposed
     to be conducted by the Company as described in the
     Prospectus, including without limitation the Company's
     business relating to HIV receptor technology and products
     (except with respect to the Columbia License Agreement and
     the Columbia Licensed Patents as to which such counsel
     expresses no opinion).  To the best of such counsel's
     knowledge, the Company has not received any notice of
     infringement or of conflict with asserted rights of others
     with respect to any patents, patent applications, trademarks,
     trademark applications, trade names, service marks,
     copyrights, copyright applications, licenses or know-how,
     proprietary techniques, including processes and substances,
     and other similar rights and proprietary knowledge (except
     with respect to the Columbia Licensed Patents as to which
     such counsel expresses no opinion) which could result in any
     material adverse effect upon the Company.  Such counsel is
     not aware of any patents of others (except with respect to
     the Columbia Licensed Patents as to which such counsel
     expresses no opinion) which are infringed by specific
     products or processes of the Company referred to in the
     Prospectus in such manner as to materially and adversely
     affect the Company;

          (ii) to the best of such counsel's knowledge, there are
     no legal or governmental proceedings pending relating to
     trade secrets, trademarks, service marks or other proprietary
     information or materials of the Company (except with respect
     to the Columbia Licensed Patents as to which such counsel
     expresses no opinion), other than review of pending
     applications for patents, and to the best of such counsel's
     knowledge no such proceedings are threatened or contemplated
     by governmental authorities or others; 

          (iii) such counsel does not know of any material
     contracts or other material documents relating to the
     Company's proprietary information (except with respect to the
     Columbia Licensed Patents as to which such counsel expresses
     no opinion), other than those filed as exhibits to the
     Registration Statement; and 

          (iv) the statements under the captions "Risk Factors -
     Dependence on and Uncertainty of Protection of Patents and
     Proprietary Rights" and "Business - Patents and Proprietary



                                     -18-


<PAGE>


     Technology" (except with respect to those statements that
     describe the Columbia License Agreement and the Columbia
     Licensed Patents as to which such counsel expresses no
     opinion), insofar as such statements constitute a summary of
     documents referred to therein or matters of law, are accurate
     summaries and fairly and correctly present, in all material
     respects, the information called for with respect to such
     documents and matters and such counsel has no reason to
     believe that the statements therein are untrue or that there
     is an omission to state a material fact required to be stated
     therein or necessary to make the statements therein not
     misleading; provided, however, that such counsel may rely on
     representations of the Company with respect to the factual
     matters contained in such statements, provided that such
     counsel shall state that nothing has come to the attention of
     such counsel which leads them to believe that such
     representations are not true and correct in all material
     respects.

     (h)  The Representatives shall have received on each Closing
Date from Wolf, Greenfield & Sacks, P.C., special patent counsel
for the Company, an opinion addressed to the Representatives and
dated such Closing Date, to the effect that such counsel is
familiar with the HIV Receptor Technology and the Company's
ganglioside conjugate vaccine technology and products and has read
the portions of the Registration Statement and the Prospectus
headed: "Risk Factors - Dependence on and Uncertainty of
Protection of Patents and Proprietary Rights" and "Business -
Patents and Proprietary Technology" (collectively, the "Technology
Portion"), and that, solely with respect to the Company's
ganglioside conjugate vaccine technology and products:

          (i)  such counsel has no knowledge of any facts which
     would preclude the Company from having clear title to the
     Company's patents or patent applications referenced in the
     Technology Portion.  To the best of such counsel's knowledge,
     the Company does not lack and will not be unable to obtain
     any rights or licenses to use any patent or know-how
     necessary to conduct the business now conducted or proposed
     to be conducted by the Company as described in the
     Prospectus.  To the best of such counsel's knowledge, the
     Company has not received any notice of infringement or of
     conflict with asserted rights of others with respect to any
     patents, patent applications, trademarks, trademark
     applications, trade names, service marks, copyrights,
     copyright applications, licenses or know-how, proprietary
     techniques, including processes and substances, and other
     similar rights and proprietary knowledge which could result
     in any material adverse effect upon the Company.  Such
     counsel is not aware of any patents of others which are



                                     -19- 


<PAGE>


     infringed by specific products or processes of the Company
     referred to in the Prospectus in such manner as to materially
     and adversely affect the Company;

          (ii) to the best of such counsel's knowledge, there are
     no legal or governmental proceedings pending relating to
     trade secrets, trademarks, service marks or other proprietary
     information or materials of the Company, other than review of
     pending applications for patents, and to the best of such
     counsel's knowledge no such proceedings are threatened or
     contemplated by governmental authorities or others; 

          (iii) such counsel does not know of any material
     contracts or other material documents relating to the
     Company's proprietary information, other than those filed as
     exhibits to the Registration Statement; and 

          (iv) the statements under the captions "Risk Factors -
     Dependence on and Uncertainty of Protection of Patents and
     Proprietary Rights" and "Business - Patents and Proprietary
     Technology", insofar as such statements constitute a summary
     of documents referred to therein or matters of law, are
     accurate summaries and fairly and correctly present, in all
     material respects, the information called for with respect to
     such documents and matters and such counsel has no reason to
     believe that the statements therein are untrue or that there
     is an omission to state a material fact required to be stated
     therein or necessary to make the statements therein not
     misleading; PROVIDED, HOWEVER, that such counsel may rely on
     representations of the Company with respect to the factual
     matters contained in such statements, provided that such
     counsel shall state that nothing has come to the attention of
     such counsel which leads them to believe that such
     representations are not true and correct in all material
     respects.

     (i)  The Representatives shall have received on each Closing
Date from Venable, Baetjer, Howard & Civiletti, L.L.P., FDA
counsel for the Company, an opinion addressed to the
Representatives and dated such Closing Date, to the effect that
such counsel has read the portions of the Registration Statement
and the Prospectus headed:  "Risk Factors - Government Regulation;
No Assurance of Regulatory Approval", "Risk Factors - Uncertainty
Related to Health Care Reform Measures and Reimbursement",
"Business - Government Regulation" and "Business - Product
Liability" (collectively, the "Regulatory Portion"), that the
statements under such captions, insofar as such statements
constitute a summary of matters of law, are accurate summaries and
fairly and correctly present, in all material respects, the
information called for with respect to such matters and such



                                     -20- 


<PAGE>


counsel has no reason to believe that the statements therein are
untrue or that there is an omission to state a material fact
required to be stated therein or necessary to make the statements
therein not misleading; PROVIDED, HOWEVER, that such counsel may
rely on representations of the Company with respect to the factual
matters contained in such statements, provided that such counsel
shall state that nothing has come to the attention of such counsel
which leads them to believe that such representations are not true
and correct in all material respects.

     (j)  All proceedings taken in connection with the sale of the
Firm Shares and the Option Shares as herein contemplated shall be
reasonably satisfactory in form and substance to the
Representatives and their counsel and the Underwriters shall have
received from Hale and Dorr a favorable opinion, addressed to the
Representatives and dated such Closing Date, with respect to the
Shares, the Registration Statement and the Prospectus, and such
other related matters, as the Representatives may reasonably
request, and the Company shall have furnished to Hale and Dorr
such documents as they may reasonably request for the purpose of
enabling them to pass upon such matters.

     (k)  The Representatives shall have received on each Closing
Date a certificate, addressed to the Representatives, and dated
such Closing Date, of an executive officer of the Company to the
effect that the signer of such certificate has reviewed and
understands the provisions of Section 517.075 of the Florida
Statutes, and represents that the Company has complied, and at all
times will comply, with all provisions of Section 517.075 and
further, that as of such Closing Date, neither the Company nor any
of its affiliates does business with the government of Cuba or
with any person or affiliate located in Cuba.

     6.   COVENANTS OF THE COMPANY.

     (A) The Company covenants and agrees as follows:

          (a)  The Company shall prepare the Prospectus in a form
     approved by the Representatives and file such Prospectus
     pursuant to Rule 424(b) under the Securities Act not later
     than the Commission's close of business on the second
     business day following the execution and delivery of this
     Agreement, or, if applicable, such earlier time as may be
     required by Rule 430A(a)(3) under the Securities Act, and
     shall promptly advise the Representatives (i) when any
     amendment to the Registration Statement shall have become
     effective, (ii) of any request by the Commission for any
     amendment of the Registration Statement or the Prospectus or
     for any additional information, (iii) of the prevention or
     suspension of the use of any preliminary prospectus or the



                                     -21- 


<PAGE>


     Prospectus or of the issuance by the Commission of any stop
     order suspending the effectiveness of the Registration
     Statement or the institution or threatening of any proceeding
     for that purpose and (iv) of the receipt by the Company of
     any notification with respect to the suspension of the
     qualification of the Shares for sale in any jurisdiction or
     the initiation or threatening of any proceeding for such
     purpose.  The Company shall not file any amendment of the
     Registration Statement or supplement to the Prospectus unless
     the Company has furnished the Representatives a copy for its
     review prior to filing and shall not file any such proposed
     amendment or supplement to which the Representatives
     reasonably object.  The Company shall use its best efforts to
     prevent the issuance of any such stop order and, if issued,
     to obtain as soon as possible the withdrawal thereof.

          (b)  If, at any time when a prospectus relating to the
     Shares is required to be delivered under the Securities Act
     and the Rules, any event occurs as a result of which the
     Prospectus as then amended or supplemented would include any
     untrue statement of a material fact or omit to state any
     material fact necessary to make the statements therein in the
     light of the circumstances under which they were made not
     misleading, or if it shall be necessary to amend or
     supplement the Prospectus to comply with the Securities Act
     or the Rules, the Company promptly shall prepare and file
     with the Commission, subject to the second sentence of
     paragraph (a) of this Section 6(A), an amendment or
     supplement which shall correct such statement or omission or
     an amendment which shall effect such compliance.

          (c)  The Company shall make generally available to its
     security holders and to the Representatives as soon as
     practicable, but not later than 45 days after the end of the
     12-month period beginning at the end of the fiscal quarter of
     the Company during which the Effective Date occurs (or 90
     days if such 12-month period coincides with the Company's
     fiscal year), an earning statement (which need not be
     audited) of the Company, covering such 12-month period, which
     shall satisfy the provisions of Section 11(a) of the
     Securities Act or Rule 158 of the Rules.

          (d)  The Company shall furnish to the Representatives
     and counsel for the Underwriters, without charge, signed
     copies of the Registration Statement (including all exhibits
     thereto and amendments thereof), and to each other
     Underwriter a copy of the Registration Statement (without
     including all exhibits thereto and all amendments thereof),
     and, so long as delivery of a prospectus by an underwriter or
     dealer may be required by the Securities Act or the Rules, as



                                     -22- 


<PAGE>


     many copies of any preliminary prospectus and the Prospectus
     and any amendments thereof and supplements thereto as the
     Representatives may reasonably request.

          (e)  The Company shall cooperate with the
     Representatives and their counsel in endeavoring to qualify
     the Shares for offer and sale under the laws of such
     jurisdictions as the Representatives may designate and shall
     maintain such qualifications in effect so long as required
     for the distribution of the Shares; provided, however, that
     the Company shall not be required in connection therewith, as
     a condition thereof, to qualify as a foreign corporation or
     to execute a general consent to service of process in any
     jurisdiction or subject itself to taxation as doing business
     in any jurisdiction.

          (f)  For a period of five years after the date of this
     Agreement, the Company shall supply to the Representatives
     and to each other Underwriter who may so request in writing,
     copies of such financial statements and other periodic and
     special reports as the Company may from time to time
     distribute generally to the holders of any class of its
     capital stock and to furnish to the Representatives a copy of
     each annual or other report it shall be required to file with
     the Commission (including the Report on Form SR required by
     Rule 463 of the Rules).

          (g)  Without the prior written consent of the
     Representatives, for a period of 180 days after the date of
     this Agreement, the Company shall not issue, sell or register
     with the Commission (other than on Form S-8 or on any
     successor form), or otherwise dispose of, directly or
     indirectly, any equity securities of the Company (or any
     securities convertible into or exercisable or exchangeable
     for equity securities of the Company), except for the
     issuance of the Shares pursuant to the Registration
     Statement, and the issuance of shares pursuant to the
     Company's existing stock option plan or bonus plan.  

          (h)  On or before completion of this offering, the
     Company shall make all filings required under applicable
     securities laws and by the Nasdaq National Market (including
     any required registration under the Exchange Act).

           (i)  Without the prior written consent of Oppenheimer,
     for a period of 180 days after the date of this Agreement,
     the Company shall not, by amending, terminating or waiving
     the agreement between the Locked-up Holder and the Company
     described in Section 4(p) or otherwise, permit any Locked-up
     Holder to offer for sale, sell, distribute, grant any option



                                     -23- 


<PAGE>


     for the sale of, or otherwise dispose of, directly or
     indirectly, any Shares of Common Stock (or any securities
     convertible into, exercisable for, or exchangeable for any
     Shares of Common Stock.

     (B)  The Company agrees to pay, or reimburse if paid by the
Representatives, whether or not the transactions contemplated
hereby are consummated or this Agreement is terminated, all costs
and expenses incident to the public offering of the Shares and the
performance of the obligations of the Company under this Agreement
including those relating to: (i) the preparation, printing, filing
and distribution of the Registration Statement including all
exhibits thereto, each preliminary prospectus, the Prospectus, all
amendments and supplements to the Registration Statement and the
Prospectus, and the printing, filing and distribution of this
Agreement; (ii) the preparation and delivery of certificates for
the Shares to the Underwriters; (iii) the registration or
qualification of the Shares for offer and sale under the
securities or Blue Sky laws of the various jurisdictions referred
to in Section 6(A)(e), including the reasonable fees and
disbursements of counsel for the Underwriters in connection with
such registration and qualification and the preparation,
distribution and shipment of preliminary and supplementary Blue
Sky memoranda; (iv) the furnishing (including costs of shipping
and mailing) to the Representatives and to the Underwriters of
copies of each preliminary prospectus, the Prospectus and all
amendments or supplements to the Prospectus, and of the several
documents required by this Section to be so furnished, as may be
reasonably requested for use in connection with the offering and
sale of the Shares by the Underwriters or by dealers to whom
Shares may be sold; (v) the filing fees of the National
Association of Securities Dealers, Inc. in connection with its
review of the terms of the public offering; (vi) the furnishing
(including costs of shipping and mailing) to the Representatives
and to the Underwriters of copies of all reports and information
required by Section 6(A)(f); (vii) inclusion of the Shares for
quotation on the Nasdaq National Market; and (viii) all transfer
taxes, if any, with respect to the sale and delivery of the Shares
by the Company to the Underwriters.  Subject to the provisions of
Section 9, the Underwriters agree to pay, whether or not the
transactions contemplated hereby are consummated or this Agreement
is terminated, all costs and expenses incident to the performance
of the obligations of the Underwriters under this Agreement not
payable by the Company pursuant to the preceding sentence,
including, without limitation, the fees and disbursements of
counsel for the Underwriters.  







                                     -24- 

<PAGE>

     7.   Indemnification.

          (a)  The Company agrees to indemnify and hold harmless
     each Underwriter and each person, if any, who controls any
     Underwriter within the meaning of Section 15 of the
     Securities Act or Section 20 of the Exchange Act against any
     and all losses, claims, damages and liabilities, joint or
     several (including any reasonable investigation, legal and
     other expenses incurred in connection with, and any amount
     paid in settlement of, any action, suit or proceeding or any
     claim asserted), to which they, or any of them, may become
     subject under the Securities Act, the Exchange Act or other
     Federal or state law or regulation, at common law or
     otherwise, insofar as such losses, claims, damages or
     liabilities arise out of or are based upon any untrue
     statement or alleged untrue statement of a material fact
     contained in any preliminary prospectus, the Registration
     Statement or the Prospectus or any amendment thereof or
     supplement thereto, or arise out of or are based upon any
     omission or alleged omission to state therein a material fact
     required to be stated therein or necessary to make the
     statements therein not misleading; PROVIDED, HOWEVER, that
     such indemnity shall not inure to the benefit of any
     Underwriter (or any person controlling such Underwriter) on
     account of any losses, claims, damages or liabilities arising
     from the sale of the Shares to any person by such Underwriter
     if such untrue statement or omission or alleged untrue
     statement or omission was made in such preliminary
     prospectus, the Registration Statement or the Prospectus, or
     such amendment or supplement, in reliance upon and in
     conformity with information furnished in writing to the
     Company by the Representatives on behalf of any Underwriter
     specifically for use therein.  This indemnity agreement will
     be in addition to any liability which the Company may
     otherwise have.

          (b)  Each Underwriter agrees, severally and not jointly,
     to indemnify and hold harmless the Company, each person, if
     any, who controls the Company within the meaning of Section
     15 of the Securities Act or Section 20 of the Exchange Act,
     each director of the Company, and each officer of the Company
     who signs the Registration Statement, to the same extent as
     the foregoing indemnity from the Company to each Underwriter,
     but only insofar as such losses, claims, damages or
     liabilities arise out of or are based upon any untrue
     statement or omission or alleged untrue statement or omission
     which was made in any preliminary prospectus, the
     Registration Statement or the Prospectus, or any amendment
     thereof or supplement thereto, contained in the last


                                        -25- 


<PAGE>


     paragraph relating to stabilization on the inside front cover
     page of the Prospectus, the concession and reallowance
     figures appearing under the caption "Underwriting" in the
     Prospectus and in the last sentence of the third full
     paragraph under the caption "Underwriting" in the Prospectus
     relating to the exercise of discretionary authority by the
     Underwriters; provided, however, that the obligation of each
     Underwriter to indemnify the Company (including any
     controlling person, director or officer thereof) shall be
     limited to the net proceeds received by the Company from such
     Underwriter.

          (c)  Any party that proposes to assert the right to be
     indemnified under this Section will, promptly after receipt
     of notice of commencement of any action, suit or proceeding
     against such party in respect of which a claim is to be made
     against an indemnifying party or parties under this Section,
     notify each such indemnifying party of the commencement of
     such action, suit or proceeding, enclosing a copy of all
     papers served.  No indemnification provided for in Section
     7(a) or 7(b) shall be available to any party who shall fail
     to give notice as provided in this Section 7(c) if the party
     to whom notice was not given was unaware of the proceeding to
     which such notice would have related and was prejudiced by
     the failure to give such notice but the omission so to notify
     such indemnifying party of any such action, suit or
     proceeding shall not relieve it from any liability that it
     may have to any indemnified party for contribution or
     otherwise than under this Section.  In case any such action,
     suit or proceeding shall be brought against any indemnified
     party and it shall notify the indemnifying party of the
     commencement thereof, the indemnifying party shall be
     entitled to participate in, and, to the extent that it shall
     wish, jointly with any other indemnifying party similarly
     notified, to assume the defense thereof, with counsel
     reasonably satisfactory to such indemnified party, and after
     notice from the indemnifying party to such indemnified party
     of its election so to assume the defense thereof and the
     approval by the indemnified party of such counsel, the
     indemnifying party shall not be liable to such indemnified
     party for any legal or other expenses, except as provided
     below and except for the reasonable costs of investigation
     subsequently incurred by such indemnified party in connection
     with the defense thereof.  The indemnified party shall have
     the right to employ its counsel in any such action, but the
     fees and expenses of such counsel shall be at the expense of
     such indemnified party unless (i) the employment of counsel
     by such indemnified party has been authorized in writing by
     the indemnifying parties, (ii) the indemnified party shall
     have reasonably concluded that there may be a conflict of



                                   -26- 



<PAGE>


     interest between the indemnifying parties and the indemnified
     party in the conduct of the defense of such action (in which
     case the indemnifying parties shall not have the right to
     direct the defense of such action on behalf of the
     indemnified party) or (iii) the indemnifying parties shall
     not have employed counsel to assume the defense of such
     action within a reasonable time after notice of the
     commencement thereof, in each of which cases the fees and
     expenses of counsel shall be at the expense of the
     indemnifying parties.  An indemnifying party shall not be
     liable for any settlement of any action, suit, proceeding or
     claim effected without its written consent.

     8.   CONTRIBUTION.  In order to provide for just and
equitable contribution in circumstances in which the
indemnification provided for in Section 7(a) is due in accordance
with its terms but for any reason is held to be unavailable from
the Company, the Company and the Underwriters shall contribute to
the aggregate losses, claims, damages and liabilities (including
any investigation, legal and other expenses reasonably incurred in
connection with, and any amount paid in settlement of, any action,
suit or proceeding or any claims asserted, but after deducting any
contribution received by the Company from persons other than the
Underwriters, such as persons who control the Company within the
meaning of the Securities Act, officers of the Company who signed
the Registration Statement and directors of the Company, who may
also be liable for contribution) to which the Company and one or
more of the Underwriters may be subject in such proportion as is
appropriate to reflect the relative benefits received by the
Company on the one hand and the Underwriters on the other from the
offering of the Shares or, if such allocation is not permitted by
applicable law or indemnification is not available as a result of
the indemnifying party not having received notice as provided in
Section 7 hereof, in such proportion as is appropriate to reflect
not only the relative benefits referred to above but also the
relative fault of the Company on the one hand and the Underwriters
on the other in connection with the statements or omissions which
resulted in such losses, claims, damages, liabilities or expenses,
as well as any other relevant equitable considerations.  The
relative benefits received by the Company and the Underwriters
shall be deemed to be in the same proportion as (x) the total
proceeds from the offering (net of underwriting discounts but
before deducting expenses) received by the Company, as set forth
in the table on the cover page of the Prospectus, bear to (y) the
underwriting discounts received by the Underwriters, as set forth
in the table on the cover page of the Prospectus.  The relative
fault of the Company or the Underwriters shall be determined by
reference to, among other things, whether the untrue or alleged
untrue statement of a material fact related to information
supplied by the Company or the Underwriters and the parties'



                                 -27- 


<PAGE>


relative intent, knowledge, access to information and opportunity
to correct or prevent such statement or omission.  The Company and
the Underwriters agree that it would not be just and equitable if
contribution pursuant to this Section 8 were determined by pro
rata allocation (even if the Underwriters were treated as one
entity for such purpose) or by any other method of allocation
which does not take account of the equitable considerations
referred to above.  Notwithstanding the provisions of this Section
8, (i) in no case shall any Underwriter (except as may be provided
in the Agreement Among Underwriters) be liable or responsible for
any amount in excess of the underwriting discount applicable to
the Shares purchased by such Underwriter hereunder, and (ii) the
Company shall be liable and responsible for any amount in excess
of such underwriting discount; provided, however, that no person
guilty of fraudulent misrepresentation (within the meaning of
Section 11(f) of the Securities Act) shall be entitled to
contribution from any person who was not guilty of such fraudulent
misrepresentation.  For purposes of this Section 8, each person,
if any, who controls an Underwriter within the meaning of Section
15 of the Securities Act or Section 20(a) of the Exchange Act
shall have the same rights to contribution as such Underwriter,
and each person, if any, who controls the Company within the
meaning of the Section 15 of the Securities Act or Section 20(a)
of the Exchange Act, each officer of the Company who shall have
signed the Registration Statement and each director of the Company
shall have the same rights to contribution as the Company, subject
in each case to clauses (i) and (ii) in the immediately preceding
sentence of this Section 8.  Any party entitled to contribution
will, promptly after receipt of notice of commencement of any
action, suit or proceeding against such party in respect of which
a claim for contribution may be made against another party or
parties under this Section, notify such party or parties from whom
contribution may be sought, but the omission so to notify such
party or parties from whom contribution may be sought shall not
relieve the party or parties from whom contribution may be sought
from any other obligation it or they may have hereunder or
otherwise than under this Section.  No party shall be liable for
contribution, with respect to any action, suit, proceeding or
claim settled without its written consent.  The Underwriter's
obligations to contribute pursuant to this Section 8 are several
in proportion to their respective underwriting commitments and not
joint.  

     9.   TERMINATION.  This Agreement may be terminated with
respect to the Shares to be purchased on a Closing Date by the
Representatives by notifying the Company at any time

          (a)  in the absolute discretion of the Representatives
     at or before any Closing Date: (i) if on or prior to such
     date, any domestic or international event or act or



                                     -28- 


<PAGE>



     occurrence has materially disrupted, or in the opinion of the
     Representatives will in the future materially disrupt, the
     securities markets; (ii) if there has occurred any new
     outbreak or material escalation of hostilities or other
     calamity or crisis the effect of which on the financial
     markets of the United States is such as to make it, in the
     judgment of the Representatives, inadvisable to proceed with
     the offering; (iii) if there shall be such a material adverse
     change in general financial, political or economic conditions
     or the effect of international conditions on the financial
     markets in the United States is such as to make it, in the
     judgment of the Representatives, inadvisable or impracticable
     to market the Shares; (iv) if trading in the Shares has been
     suspended by the Commission or trading generally on the New
     York Stock Exchange, Inc., on the American Stock Exchange,
     Inc. or on the Nasdaq National Market has been suspended or
     limited, or minimum or maximum ranges for prices for
     securities shall have been fixed, or maximum ranges for
     prices for securities have been required, by said exchanges
     or by order of the Commission, the National Association of
     Securities Dealers, Inc., or any other governmental or
     regulatory authority; or (v) if a banking moratorium has been
     declared by any state or Federal authority, or

          (b)  at or before any Closing Date, that any of the
     conditions specified in Section 5 shall not have been
     fulfilled when and as required by this Agreement.

     If this Agreement is terminated pursuant to any of its
provisions, except as set forth in Section 6(B), the Company shall
not be under any liability to any Underwriter, and no Underwriter
shall be under any liability to the Company, except that (y) if
this Agreement is terminated by the Representatives or the
Underwriters because of any failure, refusal or inability on the
part of the Company to comply with the terms or to fulfill any of
the conditions of this Agreement, the Company will reimburse the
Underwriters for all out-of-pocket expenses (including the
reasonable fees and disbursements of their counsel) incurred by
them in connection with the proposed purchase and sale of the
Shares or in contemplation of performing their obligations
hereunder and (z) no Underwriter who shall have failed or refused
to purchase the Shares agreed to be purchased by it under this
Agreement, without some reason sufficient hereunder to justify
cancellation or termination of its obligations under this
Agreement, shall be relieved of liability to the Company or to the
other Underwriters for damages occasioned by its failure or
refusal.




                                -29- 



<PAGE>


    10.  SUBSTITUTION OF UNDERWRITERS.  If one or more of the
Underwriters shall fail (other than for a reason sufficient to
justify the cancellation or termination of this Agreement under
Section 9) to purchase on any Closing Date the Shares agreed to be
purchased on such Closing Date by such Underwriter or
Underwriters, the Representatives may find one or more substitute
underwriters to purchase such Shares or make such other
arrangements as the Representatives may deem advisable or one or
more of the remaining Underwriters may agree to purchase such
Shares in such proportions as may be approved by the
Representatives, in each case upon the terms set forth in this
Agreement.  If no such arrangements have been made by the close of
business on the business day following such Closing Date,

          (a)  if the number of Shares to be purchased by the
     defaulting Underwriters on such Closing Date shall not exceed
     10% of the Shares that all the Underwriters are obligated to
     purchase on such Closing Date, then each of the nondefaulting
     Underwriters shall be obligated to purchase such Shares on
     the terms herein set forth in proportion to their respective
     obligations hereunder; provided, that in no event shall the
     maximum number of Shares that any Underwriter has agreed to
     purchase pursuant to Section 1 be increased pursuant to this
     Section 10 by more than one-ninth of such number of Shares
     without the written consent of such Underwriter, or

          (b)  if the number of Shares to be purchased by the
     defaulting Underwriters on such Closing Date shall exceed 10%
     of the Shares that all the Underwriters are obligated to
     purchase on such Closing Date, then the Company shall be
     entitled to an additional business day within which it may,
     but is not obligated to, find one or more substitute
     underwriters reasonably satisfactory to the Representatives
     to purchase such Shares upon the terms set forth in this
     Agreement.

     In any such case, either the Representatives or the Company
shall have the right to postpone the applicable Closing Date for a
period of not more than five business days in order that necessary
changes and arrangements (including any necessary amendments or
supplements to the Registration Statement or Prospectus) may be
effected by the Representatives and the Company.  If the number of
Shares to be purchased on such Closing Date by such defaulting
Underwriter or Underwriters shall exceed 10% of the Shares that
all the Underwriters are obligated to purchase on such Closing
Date, and none of the nondefaulting Underwriters or the Company
shall make arrangements pursuant to this Section within the period
stated for the purchase of the Shares that the defaulting
Underwriters agreed to purchase, this Agreement shall terminate
with respect to the Shares to be purchased on such Closing Date



                                    -30- 


<PAGE>


without liability on the part of any nondefaulting Underwriter to
the Company and without liability on the part of the Company,
except in both cases as provided in Sections 6(B), 7, 8 and 9.
The provisions of this Section shall not in any way affect the
liability of any defaulting Underwriter to the Company or to the
nondefaulting Underwriters arising out of such default.  A
substitute underwriter hereunder shall become an Underwriter for
all purposes of this Agreement.

     11.  MISCELLANEOUS.  The respective agreements,
representations, warranties, indemnities and other statements of
the Company or its officers and of the Underwriters set forth in
or made pursuant to this Agreement shall remain in full force and
effect, regardless of any investigation made by or on behalf of
any Underwriter or the Company or any of the officers, directors
or controlling persons referred to in Sections 7 and 8 hereof, and
shall survive delivery of and payment for the Shares.  The
provisions of Sections 6(B), 7, 8 and 9 shall survive the
termination or cancellation of this Agreement.

     This Agreement has been and is made for the benefit of the
Underwriters and the Company and their respective successors and
assigns, and, to the extent expressed herein, for the benefit of
persons controlling any of the Underwriters, or the Company, and
directors and officers of the Company, and their respective
successors and assigns, and no other person shall acquire or have
any right under or by virtue of this Agreement.  The term
"successors and assigns" shall not include any purchaser of Shares
from any Underwriter merely because of such purchase.

     All notices and communications hereunder shall be in writing
and mailed or delivered or by telephone or telegraph if
subsequently confirmed in writing, (a) if to the Representatives,
c/o Oppenheimer & Co., Inc., Oppenheimer Tower, World Financial
Center, New York, New York 10281 Attention: Peter J. Crowley, and
(b) if to the Company, to its agent for service as such agent's
address appears on the cover page of the Registration Statement.

     This Agreement shall be governed by and construed in
accordance with the laws of the State of New York without regard
to principles of conflict of laws.

     This Agreement may be signed in any number of counterparts,
each of which shall be an original, with the same effect as if the
signatures thereto and hereto were upon the same instrument.








                                     -31- 


<PAGE>



     Please confirm that the foregoing correctly sets forth the
agreement among us.

                                         Very truly yours,


                                         PROGENICS PHARMACEUTICALS, INC.


                                         By  _____________________________
                                             Name:  
                                             Title: 

Confirmed:

OPPENHEIMER & CO., INC.

VECTOR SECURITIES INTERNATIONAL, INC.

Acting severally on behalf of 
themselves and as Representatives 
of the several Underwriters named 
in Schedule I annexed hereto

OPPENHEIMER & CO., INC.


By:_________________________________
   Name:  
   Title: 


VECTOR SECURITIES INTERNATIONAL, INC.


By:_________________________________
   Name:  
   Title: 







                                      -32- 



<PAGE>


                                   SCHEDULE I

                                                               Number of
                                                             Firm Shares to
        Name                                                  Be Purchased 
        ----                                                 --------------

Oppenheimer & Co., Inc.
Vector Securities International, Inc.

_______________________



                                                                ________
                                     Total                                  































                                    -33-



<PAGE>




                        CERTIFICATE OF ELIMINATION

                                    OF

                            CLASS A COMMON STOCK

                                    OF

                       PROGENICS PHARMACEUTICALS, INC.

                              ---------------

       Pursuant to Section 151 of Title 8 of the Delaware Code of 1953

                              ---------------


       THE UNDERSIGNED, being the Vice President and Treasurer of Progenics
Pharmaceuticals, Inc., a Delaware corporation (the "Corporation"), DOES HEREBY
CERTIFY that, pursuant to the provisions of Section 151 of Title 8 of the
Delaware Code of 1953 and the authority conferred upon the Board of Directors by
the provisions of the Certificate of Incorporation, as amended, of the
Corporation (the "Certificate of Incorporation"), the Board of Directors of the
Corporation duly adopted resolutions regarding the series of its Common Shares
previously designated as Class A Common Stock in a Certificate of Designation
dated October 5, 1989.  These resolutions are as follows: 

       RESOLVED, that 5,000,000 shares of Common Shares were previously
designated as Class A Common Stock, par value $.001 per share (the "Class A
Common Stock") in a Certificate of Designation dated October 5, 1989, that none
of the authorized shares of Class A Common Stock are outstanding and that none
of the shares designated as Class A Common Stock will be issued; and


<PAGE>

       RESOLVED, that pursuant to the authority granted expressly to and
vested in the Board of Directors of the Corporation by the provisions of the
Certificate of Incorporation, as amended, of the Corporation (the "Certificate
of Incorporation"), the number of shares designated as Class A Common Stock
shall be decreased by 5,000,000 shares to zero and such shares shall resume the
status of undesignated Common Shares.
    

                                   2

<PAGE>

       IN WITNESS WHEREOF, the Certificate of Elimination has been signed by
Robert A. McKinney of the Corporation, as of the 25th day of October, 1996.

                                          PROGENICS PHARMACEUTICALS, INC.



                                          By:  /s/ Robert A. McKinney
                                               ----------------------
                                          Name:  Robert A. McKinney
                                          Title: Vice President and Treasurer



                                   3




<PAGE>




                          CERTIFICATE OF INCREASE

                                    OF

                               COMMON STOCK

                                    OF

                       PROGENICS PHARMACEUTICALS, INC.

                              ---------------

       Pursuant to Section 151 of Title 8 of the Delaware Code of 1953

                              ---------------


       THE UNDERSIGNED, being the Vice President and Treasurer of Progenics
Pharmaceuticals, Inc., a Delaware corporation (the "Corporation"), DOES HEREBY
CERTIFY that, pursuant to the provisions of Section 151 of Title 8 of the
Delaware Code of 1953 and the authority conferred upon the Board of Directors by
the provisions of the Certificate of Incorporation, as amended, of the
Corporation (the "Certificate of Incorporation"), the Board of Directors of the
Corporation duly adopted resolutions providing for an increase in the number 
of shares of authorized Common Shares which are designated as Common Stock 
from 12,000,000 to 40,000,000.  These resolutions are as follows:

       RESOLVED, that the Board of Directors previously designated 12,000,000 
Common Shares as Common Stock, par value $.001 per share (the "Common Stock") 
pursuant to a Certificate of Amendment of the Corporation's Certificate of 
Incorporation dated July 17, 1989; and

<PAGE>

       RESOLVED, that pursuant to the authority granted expressly to and
vested in the Board of Directors of the Corporation by the provisions of the
Certificate of Incorporation, the number of Common Shares designated as Common
Stock shall be increased by 28,000,000 shares to a total of 40,000,000 shares.

                                   2

<PAGE>

       IN WITNESS WHEREOF, the Certificate of Increase has been signed by 
Robert A. McKinney of the Corporation, as of the 25th day of October, 1996.

                                             PROGENICS PHARMACEUTICALS,
                                             INC.



                                             By:  /s/ Robert A. McKinney
                                                  ----------------------
                                             Name:  Robert A. McKinney
                                             Title: Vice President and Treasurer



                                   3

<PAGE>

                                                                    Exhibit 4.1

<TABLE>
<C>                          <S>                                                    <C>
COMMON STOCK                                                                                                 COMMON STOCK


  Graphic                                                                                                         Graphic

                                                    [PROGENICS
                                               PHARMACEUTICALS, INC.
                                                       LOGO]
                                                                                     SEE REVERSE FOR CERTAIN DEFINITIONS
                                                                                     CUSIP 743187 10 6


                              INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE


THIS CERTIFIES THAT












IS THE OWNER OF 



                       FULLY PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK, $.0013 PAR VALUE, OF

                                           PROGENICS PHARMACEUTICALS, INC.
transferable on the books of the Corporation by the holder hereof in parson or by duly authorized attorney upon surrender of this 
certificate properly endorsed.

    This certificate is not valid until countersigned and registered by the Transfer Agent and Registrar.
    Witness the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers.


Dated:


     /s/Robert A. McKinney                  [PROGENICS PHARMACEUTICALS, INC.             /s/Paul A. Maddon
                                                       CORPORATE 
          TREASURER                                      SEAL                            CHAIRMAN AND CHIEF EXECUTIVE OFFICER
                                                         1986
                                                        DELAWARE]
</TABLE>




___________________________________________________
AMERICAN BANK NOTE COMPANY  NOV 8, 1996 dw
3504 ATLANTIC AVENUE
SUITE 12
LONG BEACH, CA 90807           047397fc
(310) 989-2333
(FAX) (310) 426-7450     proof /s/illegible   NEW
                               ____________
___________________________________________________





<PAGE>

<TABLE>
<S>                                                               <C>
The Corporation will furnish without charge to each stockholder who so requests the powers, designations, preferences and 
relative, participating, optional or other special rights of each class of stock or series thereof and the qualifictions, 
limitations or restrictions of such preferences and/or rights.

     The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they
they were written out in full according to applicable laws or regulations:

     TEN COM  --  as tenants in common                            UNIF GIFT MIN ACT -- ______________Custodian____________________
     TEN ENT  --  as tenants by the entireties                                             (Cust)                   (Minor)
     JT TEN   --  as joint tenants with right of                                       under Uniform Gifts to Minors
                  survivorship and not as tenants                                      Act________________________________________
                  in common                                                                               (State)
                                                                  UNIF TRF MIN ACT -- _______________Custodian (Until age________)
                                                                                           (Cust)
                                                                                      _______________under Uniform Transfers
                                                                                           (minor)
                                                                                      to Minors Act_________________________
                                                                                                            (State)

                          Additional abbreviations may also be used though not in the above list.

For value received,________________________________________________________________________ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
  IDENTIFYING NUMBER OF ASSIGNEE


______________________________________



__________________________________________________________________________________________________________________________________
                                    (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)


__________________________________________________________________________________________________________________________________


__________________________________________________________________________________________________________________________________


__________________________________________________________________________________________________________________________ Shares
of the Common Stock represented by the within Certificate, and do hereby irrevocably constitute and appoint


_________________________________________________________________________________________________________________________Attorney
to transfer the said stock on the books of the within named Corporation with full power of substitution in the premises.



Dated________________________________________




                                                                  ________________________________________________________________
                                                                  Notice:  THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH 
                                                                           THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE 
                                                                           IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT 
                                                                           OR ANY CHANGE WHATEVER.


Signature(s) Guaranteed:





______________________________________________________________
THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIBIBLE GUARANTOR
INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS
AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED MEDALLION 
SIGNATURE GUARANTEE PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-15







___________________________________________________
AMERICAN BANK NOTE COMPANY  NOV 11, 1996 dw
3504 ATLANTIC AVENUE
SUITE 12
LONG BEACH, CA 90807           047397bk
(310) 989-2333
(FAX) (310) 426-7450     proof /s/illegible   REV 1
                               ____________
___________________________________________________

</TABLE>





<PAGE>

                                                                Exhibit 5.1



                                                 November 12, 1996


Progenics Pharmaceuticals, Inc.
777 Old Saw Mill River Road
Tarrytown, New York,  10591


Ladies and Gentlemen:

     We have acted as counsel to Progenics Pharmaceuticals, Inc., a Delaware 
corporation (the "Company"), in connection with the filing by the Company of 
a Registration Statement on Form S-1 on the date hereof (the "Registration 
Statement") relating to the public offering of up to 2,300,000 shares (the 
"Stock") of the Company's Common Stock, $.0013 par value per share.

     Based on the foregoing, it is our opinion that:

          1. The issuance of the Stock has been lawfully and duly authorized; 
     and

          2. When the Stock has been issued, delivered and sold upon the 
     terms stated in the Registration Statement, the Stock will be legally 
     issued, fully paid and nonassessable.

      We consent to the filing of this opinion as Exhibit 5.1 to the 
Registration Statement and to the references to this firm on the cover of the 
Registration Statement and under the heading "Legal Matters" in the 
Prospectus included in such Registration Statement.


                                                  Very truly yours,




                                                   /s/ DEWEY BALLANTINE






<PAGE>

                                                                 Exhibit 10.10

                          gp120 SUPPLY AGREEMENT

This Agreement, dated as of the 19th day of July, 1995, is between 
E. I. DU PONT DE NEMOURS AND COMPANY, a Delaware corporation with 
a place of business at 549 Albany St., Boston, MA 02118 
("DUPONT"), and PROGENICS PHARMACEUTICALS, INC., a Delaware 
corporation with its principal place of business at Old Saw Mill 
River Road, Tarrytown, New York 10591 ("PROGENICS").

1.  PURPOSE AND SCOPE OF THIS AGREEMENT

    A.  During the term hereof, PROGENICS will manufacture and sell to DUPONT,
and DUPONT shall purchase from PROGENICS, all of DUPONT's requirements for 
resale of recombinant HIV-1LAI gp120 (full length) produced in a CHO 
expression system (the "Product") for DUPONT's marketing, distribution and 
resale throughout the world. DUPONT will limit sales to customers who intend 
to use the Product only for research purposes and not for other purposes such 
as clinical diagnostics or vaccine development.

    B.    DUPONT will resell the Product as packaged by PROGENICS, and DUPONT 
will not modify the Product or combine it with other components prior to 
resale.

    C.    PROGENICS has developed Product specifications for the Product which 
are attached as Exhibit A. All PROGENICS manufacturing of Product will comply 
with the Product processing standards and specifications. PROGENICS may 
revise the processing standards and specifications as it deems necessary and 
will advise DUPONT as far in advance of any changes as is reasonably 
possible. If any change affects customer use or perceived performance of the 
Product, PROGENICS will give DUPONT at least 90 days advance notice of such 
change.

    D.    PROGENICS will package the Product under specifications established 
by DUPONT with PROGENICS' consent. Both DUPONT's and PROGENICS' names shall 
appear on the Product label and promotional material, with the statement 
"Manufactured by Progenics Pharmaceuticals, Inc. for E. I. du Pont de 
Nemours and Company." All Product labeling and literature shall contain the 
phrase "For laboratory use only--not for vaccine or diagnostic use." Any 
labeling changes will require the prior approval of DUPONT.


<PAGE>

2.  IMPROVED PRODUCTS

    A.    If during the term hereof PROGENICS develops an improved Product and 
the commercialization of the improved Product reaches the market evaluation 
stage, PROGENICS will give DUPONT written notice of its plans to 
commercialize the improved Product and offer to make available, at DUPONT's 
cost, sample of the improved Product for DUPONT's evaluation, but as testing 
materials only and not under circumstances that would commit PROGENICS or 
DUPONT to supply the improved Product or give customers an expectation that 
the improved Product will be commercialized. DUPONT may elect to add the 
improved Product to this Agreement at any time, subject to provisions of 
Paragraph 2-B below. The parties intend that DUPONT will have advance notice 
of the introduction of improved Product to enable DUPONT to sell remaining 
inventory of Product that may be replaced by the improved Product.

    B.    PROGENICS may discontinue a Product that has, in PROGENICS' sole 
opinion, been replaced by an improved Product. If PROGENICS decides to 
discontinue a Product, PROGENICS will give DUPONT notice at least 90 days in 
advance of the discontinuance.

3.  PRICE AND FORECASTING

    A.  DUPONT will pay PROGENICS for Product as follows:
        1.  RAW MATERIALS COST  DUPONT will pay PROGENICS for the
        Product raw material cost at
        [***] An example of Revenue Sharing is attached hereto as Exhibit B 
        for purposes of illustration. DUPONT will provide worldwide Product 
        sales reports each April and October during the term hereof. 
        PROGENICS shall, on the basis of such reports, calculate the revenue 
        sharing for such six-month period and invoice DUPONT for the amount 
        owing. Such invoices shall include documentation of the method of 
        establishing the amount owning. For purposes of revenue sharing.
        [***]














        3. LARGE VOLUME PURCHASERS  DUPONT may negotiate special pricing 
        with large volume purchasers, in which event the parties shall 
        negotiate in good faith a discounted raw materials cost. In no 
        event shall the PROGENICS price to DUPONT be less than [***]


                                            2

[***] Confidential Treatment Requested

<PAGE>

All prices are F.O.B. PROGENICS' plant. PROGENICS assumes all risks and costs 
of freight, insurance and similar shipping costs.

    B.    The raw material prices stated in Paragraph 3-A may be revised by 
PROGENICS from time to time during the term hereof on at least 90 days' 
advance written notice to DUPONT.

    C.    On execution of this Agreement and then on a semi-annual basis 
during the term of this Agreement, DUPONT will provide to PROGENICS a written 
non-binding forecast by month for purchases of Product by DUPONT during each 
month of the succeeding twelve months.

4.  ORDERS FOR PRODUCT AND PAYMENT

    A.    At least once each year during the term of this Agreement, DUPONT 
will issue a Blanket Purchase Order for anticipated Product purchases. DUPONT 
will then issue releases against the Blanket Purchase Order, on at least a 
monthly basis, at least 30 days in advance of the requested ship date. 
Releases will be firm orders.

    B.    PROGENICS will manufacture and ship the Product to DUPONT within 
ten days of DUPONT's requested ship date. On shipment of an Order, PROGENICS 
will invoice DUPONT for the raw material cost of the Product.

    C.    DUPONT will pay PROGENICS within 30 days of DUPONT's receipt of a 
correct PROGENICS invoice.

    D.    DUPONT may request manufacture of Product using its standard 
purchase order forms or other written means (an "Order"). Purchases under 
this Agreement will be governed by the provisions of this Agreement, rather 
than the standard terms and conditions of DUPONT's purchase order form or any 
PROGENICS form.

5. QUALITY CONTROL, REJECTION OF NONCONFORMING
   PRODUCTS AND NOTICE OF CUSTOMER COMPLAINTS

    A.    PROGENICS and DUPONT agree to exchange sufficient quality and 
Product release information to avoid duplication of testing of Product. 
PROGENICS and DUPONT will mutually agree on the types and amounts of 
information needed to reach this goal.

    B.    PROGENICS will manufacture Product in accordance with the 
specification attached in Exhibit A and any amendments to Exhibit A. DUPONT 
may return any defective or nonconforming Product to PROGENICS. Nonconformance 
will mean any failure to meet specification or other manufacturing defect 
that renders the

                                       3


<PAGE>

Product unsuitable for sale or use. Risk of loss and expenses incurred in 
shipping any defective or nonconforming Product to PROGENICS will be borne by 
PROGENICS with a direct reimbursement to DUPONT or, at DUPONT's option, 
credit on subsequent purchases.

    C.    DUPONT will notify PROGENICS of any customer complaint about a 
Product or Improved Product defect within ten days of confirmation of the 
defect. The notice will specify the Product and type of defect.

6.  LIMITED WARRANTY AND LIMITATION OF REMEDIES

    A.    PROGENICS warrants to DUPONT that all Product meets the 
specifications stated in Exhibit A and is free of defects in Material and 
manufacture at the time of shipment. If any Product is proven to be defective 
in material or manufacture, PROGENICS' entire liability and DUPONT's 
exclusive remedy will be, at PROGENICS' option, either replacement of the 
Product, or refund of the purchase price paid by DUPONT for the defective 
Product, within a reasonable time after written notification of the defect 
and return of the defective Product to PROGENICS. Notices of defect must be 
received by PROGENICS within 60 days of DUPONT's receipt of notice of a 
defect from the customer.

    B.    THE WARRANTY STATED IN PARAGRAPH 6-A IS MADE IN LIEU OF ALL OTHER 
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED 
WARRANTY OF MERCHANTABILITY, THE IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR 
PURPOSE, ANY IMPLIED WARRANTY ARISING OUT OF A COURSE OF DEALING OR OF 
PERFORMANCE, CUSTOM OR USAGE OF TRADE, EXCEPT OF TITLE AND AGAINST PATENT 
INFRINGEMENT.

    C.    PROGENICS has no obligations under this warranty with respect to 
Products that have been modified or damaged through misuse, abuse, accident, 
neglect, improper storage or mishandling by DUPONT, or if DUPONT holds Product 
in storage beyond the natural age of the Product.

    D. PROGENICS warrants and represents that (i) Product does not constitute 
the subject matter of any currently pending litigation and PROGENICS is not 
aware as of the effective date of this Agreement of any litigation 
contemplated by PROGENICS or any other third party with respect to the 
subject matter of this Agreement and (ii) sale and use of Product will not 
infringe any third party patents and that any patent rights necessary for 
DUPONT and its customers to use and sell Product have been acquired by 
PROGENICS. No warranty or representation is made with respect to use of 
Product for purposes other than research or for use in combination with other 
products.

                                       4


<PAGE>

7.  LIMITATION OF LIABILITIES: TIME LIMIT FOR FILING ACTION

    A.    Subject to the indemnity provisions set forth below, NEITHER PARTY 
WILL UNDER ANY CIRCUMSTANCES BE LIABLE TO THE OTHER FOR INDIRECT, INCIDENTAL, 
SPECIAL OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, LOSS OF 
PROFITS, REVENUE OR BUSINESS) RESULTING FROM OR IN ANY WAY RELATED TO THE 
PRODUCTS, ANY OF DUPONT'S PURCHASE ORDERS, THIS AGREEMENT, OR, THE 
TERMINATION OR NONRENEWAL OF THIS AGREEMENT. This limitation applies 
regardless of whether the damages are sought based on breach of warranty, 
breach of contract, negligence, strict liability in tort, or any other legal 
theory.

    B.    Any action for breach of warranty or any other obligation under 
this Agreement must be commenced within one year after the breach occurs.

8.  INDEMNIFICATION

A.    PROGENICS agrees to indemnify, defend and hold harmless DUPONT from any 
cost, loss, claim, liability and expense (including reasonable attorney's fees 
and expenses of litigation) by third parties for property damage, personal 
injury or death to the extent based on PROGENICS' breach of this Agreement or 
on PROGENICS' negligence with respect to manufacture of the Product.

    B.    PROGENICS will defend DUPONT at PROGENICS' cost and expense, 
including reasonable attorney's fees, against any claim or suit for 
infringement of patent brought against DUPONT to the extent the claim 
concerns the Product. In addition, PROGENICS will indemnify DUPONT against 
any judgment awarded in such a suit, provided that DUPONT gives PROGENICS 
prompt written notice of the claim, the right to maintain sole control of the 
defense and all negotiations for settlement of the claim or suit, and 
cooperates with PROGENICS if requested in the defense of the claim of suit.

    C.    DUPONT agrees to indemnify, defend and hold harmless PROGENICS from 
any cost, loss, claim, liability and expense (including reasonable attorney's 
fees and expenses of litigation) by third parties for property damage, 
personal injury or death to the extent based on DUPONT's breach of this 
Agreement or on DUPONT's negligence with respect to sale or distribution of 
the Product.

    D. (i) DUPONT will promptly advise PROGENICS in writing of any claim of 
infringement and of the commencement against it of any claim for infringement 
of a patent issued to a third party based upon the sale of any Product. 
PROGENICS will, if promptly requested in writing to do so, and subject to the 
other conditions and limitations of this Section, defend any such lawsuit.

                                       5


<PAGE>

    (ii) PROGENICS shall have the control of the defense of such lawsuit. 
DUPONT agrees to assist PROGENICS in the defense of such suit or action by 
providing information and, if need be, fact witnesses. DUPONT shall have the 
right to be represented by its own attorneys at DUPONT's own expense, which 
attorneys will act only in an advisory capacity.

    (iii) If PROGENICS is requested to defend a lawsuit as described above, 
PROGENICS will defend DUPONT for any damages and costs that may become 
payable under a final judgment or decree by any court in such lawsuit.

    (iv) Nothing herein shall authorize PROGENICS to settle any lawsuit 
without the consent of Licensee, if by such settlement DUPONT is obligated to 
make any monetary payment, to transfer any property or any interest in 
property, to become subject to an injunction, or to grant any license or 
other rights under its intellectual property rights.

    (v) If DUPONT is unable to dispose of any inventory due to infringement of 
third party patent, then PROGENICS shall provide DUPONT with a credit equal 
to the amount of inventory which DUPONT cannot dispose of due to infringement 
of a third party patent.

9.  CONFIDENTIALITY AND PATENT RIGHTS

    A.    DUPONT will treat as confidential information and not disclose to 
third persons or use for its own benefit or the benefit of others, any of 
PROGENICS' developments, business knowledge, know-how, discoveries (including 
PROGENICS' Product formula, processing standards, specification, test 
procedures and other information concerning the design, composition and 
method of manufacture of the Product) and other confidential or proprietary 
information which may be disclosed to DUPONT in writing or confirmed in 
writing and specifically designated as "confidential".

    B.    The obligation of nondisclosure and non-use set forth above shall 
not apply to any items which:

    1.    Are available to the public or become available to the public through
          no fault of the recipient;

    2.    are known by the recipient at the time of disclosure, as shown by 
          prior written records;

    3.    are rightfully received by the recipient from a third party without 
          a duty of nondisclosure; or

    4.    are developed by or for the recipient independent of the disclosure
          hereunder, as evidenced by the recipient's written records relating 
          thereto.

The obligation of nondisclosure and non-use set forth above shall continue for 
a period of five years from disclosure, notwithstanding any earlier 
termination of this Agreement.

                                        6


<PAGE>

    E.    Neither party acquires any intellectual property rights or licenses 
under this Agreement, or rights to use confidential information disclosed to 
it hereunder for purposes other than complying with its obligations hereunder.

10. TERM AND TERMINATION

    A.    This Agreement commences on the date first above written and 
continues unless and until either party gives the other at least 120 days 
advance written notice of termination.

    B.    Either party may terminate this Agreement if the other party 
breaches this Agreement by giving 30 days prior written notice, subject, 
however, to the other party's right to cure the breach within the notice 
period.

    C.    Even after termination, the provisions of this Agreement still 
apply to all Product ordered, purchased and manufactured, all obligations 
created or arising, and all transactions and events occurring before the date 
of termination.

11. NOTICES

A.    All notices required by this Agreement must be in writing and sent by 
certified mail, with return receipt requested, Federal Express or other 
overnight service. The date of a notice is the date it is received. A 
facsimile copy of any notice shall be sent in addition to the written notice 
herein specified.

    B.    DUPONT will send all notices under this Agreement to:

          Attn.: CEO
          Progenics Pharmaceuticals, Inc.
          Old Saw Mill River Road
          Tarrytown, NY 10591
          Telex (914) 789-2817

    C.    PROGENICS will send all notices under this Agreement to:

          Attn.: Product Manager
          DuPont Medical Products
          549 Albany Street
          Boston, MA 02118
          Telex (617) 542-8463
          
    D.    A party may designate in writing other individuals or locations to 
          receive notice.

                                       7


<PAGE>

12. DISPUTE RESOLUTION

    A.    The parties agree to attempt in good faith to resolve any dispute 
arising out of or relating to this Agreement promptly by negotiations.

    1.    Either party may give the other party written notice of any 
          dispute not resolved in the normal course of business. Executives 
          of both parties at levels one step above the project personnel who 
          have previously been involved in the dispute will meet at a 
          mutually acceptable time and place within ten days after delivery 
          of the notice, and thereafter as often as they reasonably deem 
          necessary. The purpose of this meeting is for the executives to 
          exchange relevant information and to attempt to resolve the 
          dispute.
          
    2.    If the matter has not been resolved by the executives within 30 
          days of the notice, or if the parties fail to meet within the ten 
          day period, the dispute will be referred to senior executives of 
          both parties who have authority to settle the dispute to attempt 
          to resolve the dispute. If the matter has not been resolved within 
          30 days from the referral of the dispute to the senior executives, 
          or if no meeting has taken place within 15 days after referral to 
          the senior executives, either party may initiate mediation or 
          other mutually agreed to alternate dispute resolution mechanism.
          
    3.    If the dispute has not been resolved by negotiation as stated 
          above, the parties agree to attempt to settle the dispute by 
          mediation using a third party neutral; provided however, that if 
          the dispute has not been resolved within ninety (90) days of the 
          initial notice of dispute for whatever reason, either party may 
          pursue such judicial relief as it deems appropriate.
          
    B.    The procedures stated in Paragraph 12-A will be the sole and 
exclusive procedures for the resolution of disputes between the parties 
arising out of or relating to this Agreement. A party, however, may seek a 
preliminary injunction or other provisional judicial relief if in its 
judgment such action is necessary to avoid irreparable damage or to preserve 
the status quo. Despite such action the parties will continue to participate 
in good faith in the procedures specified in this Paragraph 12.

C.    Any questions, claims, disputes or litigation arising from or related 
to this Agreement are governed by the law of the state of New York, without 
regard to the principles of conflicts of law.

                                       7


<PAGE>

13. GENERAL TERMS

    A.    No liability shall result from delay in performance, or 
nonperformance, caused by circumstances beyond the control of the party 
affected, including without limitation Act of God, fire, flood, war, 
government action, riot, civil disturbance, accident, inability to obtain 
labor, material, equipment or transportation. Quantities so affected by force 
majeure may be eliminated without liability, but the Agreement shall remain 
otherwise unaffected.

    B.    The relationship of the parties under this Agreement is that of 
independent contractors. Nothing in this Agreement authorizes either party to 
act for the other as an agent.

    C.    Neither party may assign any of its rights or delegate or 
subcontract any of its duties under this Agreement without first getting the 
other party's permission in writing. Notwithstanding the foregoing, 
assignment and delegation may be made by either party hereto without such 
prior permission in connection with the transfer by such party of the 
business to which this Agreement relates.

    D.    This Agreement represents the entire agreement of the parties, and 
supersedes any and all prior agreements, conversations and understandings 
between the parties hereto with respect to the subject matter hereof. No 
modification of its provisions shall be valid unless it is in writing and 
signed by both parties. The provisions of this Agreement are severable. If 
any provision herein violates or anywhere contravenes any applicable law, it 
shall not be deemed a part of this Agreement.

    C. This Agreement shall be interpreted in accordance with the laws of 
New York.


ACCEPTED AND AGREED TO:

PROGENICS PHARMACEUTICALS, INC.    E.I. DU PONT DE NEMOURS
                                   AND COMPANY

By: Paul J. Maddon                 By: Janet J. Seal
- ---------------------------        ----------------------------
Title:  Chairman & CEO             Title:  Non Business District

                                      8


<PAGE>

                                  PROGENICS
                                   Sheet 1


[***]






















                                         Page 1



[***] Confidential Treatment Requested

<PAGE>

                                       PROGENICS

[LOGO]                                [LETTERHEAD]



                             PRODUCT SPECIFICATION SHEET


                            [***]



*** Confidential Treatment Requested 


<PAGE>

[LOGO]

                                      [LETTERHEAD]


E.I. DU PONT DE NEMOURS & CO. (INC.)
    MEDICAL PRODUCTS DEPARTMENT

Reference is made to the Agreement entered into the 19th day of July, 1995, 
as amended between E.I. DuPont de Nemours and Company (DuPont) and Progenics 
Pharmaceuticals, Inc. (Progenics) relative to the purchase of HIV-1 (LAI) 
gp120 by DuPont. It is hereby mutually agreed to further amend the aforesaid 
Agreement in the following manner effective August 24, 1995.

This amendment is being made to update specifications, extending stability 
from 6 months at -80DEG. C to 12 months from date of 
purification/repurification. Hence a new Product specification 
Exhibit A is attached, dated and effective August, 1995.

This amendment is also being made to update the "Orders for Product and 
Payment" clause, to include Progenics' agreement to supply DuPont Product 
with at least nine (9) months shelf life upon receipt by DuPont.

All other terms and conditions of the current Agreement, except as modified 
in the above manner, shall continue in full force and effect. Please indicate 
your acceptance of this amendment by signing both copies in the space 
provided below and return the copy marked "DuPont M&L Copy" to Robert Hand, 
DuPont Merck Pharmaceutical Co., Purchasing Department, 331 Treble Cove Road, 
Billerica, MA 01862.

                                           Very truly yours,

PROGENICS PHARMACEUTICALS, INC.                 E.I. DUPONT de NEMOURS & CO.

BY: /s/ Paul J. Maddon                          BY: /s/ R.M. Hand
- --------------------------------                ----------------------------

TITLE: Chief Executive Officer                  TITLE: Sr. Purchasing Agent
- --------------------------------                ----------------------------

DATE:  October 27, 1995                         DATE: September 10, 1995
- --------------------------------                ----------------------------


Attach.


<PAGE>

                         MATERIALS SPECIFICATION SHEET
                             (PURCHASED MATERIALS)




                            [***]   





NEA201-0995              SUPERCEDES: 081895





*** Confidential Treatment Requested 


<PAGE>

                                                                   Exhibit 10.11

[LOGO]

E.I. DU PONT DE NEMOURS & CO. (INC.)
MEDICAL PRODUCTS DEPARTMENT

This document, when properly executed, shall constitute a Supply
Agreement between Progenics Pharmaceuticals, Inc. with offices at
Old Saw Mill River Road, Tarrytown, NY, (Progenics) and
E.I. DuPont de Nemours and Company (DuPont), with offices at
549 Albany Street, Boston, MA.

1.     PERIOD OF AGREEMENT:
       May 1, 1995 through April 30, 1998. After the original term, this 
       Agreement will renew automatically for successive 12 month periods 
       unless either party gives notice to the other of its intention not to 
       renew at least 120 days prior to the expiration of the then current 
       term.

2.     MATERIAL: 
       Recombinant Soluble sCD4, referred to hereafter as sCD4 or Product.

3.     MATERIAL SPECIFICATIONS: 
       Material shall be suppled in the form and manner, and must conform in 
       all material respects to the specifications set out in Attachment A. 
       Alterations to these specifications require the express written 
       consent of each party.

4.     INABILITY TO SUPPLY: 
       Progenics recognizes the importance of its obligation to meet DuPont's 
       material requirements in a timely and reliable manner. To enable such 
       continuity of supply, Progenics will use its best efforts to arrange 
       for sCD4 to be manufactured on Progenics' behalf if some unusual event 
       causes Progenics' inability to supply. If at any time, Progenics for a 
       continuous period of ten (10) days due to a force majeure event, or 
       non-force majeure event, shall be unable or unwilling to deliver any 
       Product subject to this Agreement and attachments hereto, then 
       Progenics shall notify DuPont of the situation and use its best 
       efforts to arrange for sCD4 to be manufactured to DuPont's material 
       requirements hereunder. In the event that the failure to deliver sCD4 
       shall be as a result of the fault of Progenics, then Progenics shall 
       bear all costs necessary to cause the sCD4 to be manufactured by 
       another party ("Alternate Manufacturing Cost").

                          MEDICAL PRODUCTS DEPARTMENT
     549 Albany Street, Boston, Massachusetts 02118 Telephone 617-482-9595
     Fax (617) 542-8468

<PAGE>
                                       2

       INABILITY TO SUPPLY (Cont'd): 
       In the event that the failure to deliver sCD4 shall be as a result of the
       fault of DuPont, then DuPont shall bear all Alternate Manufacturing 
       Costs. In all other events, Progenics shall arrange for the alternate 
       manufacturer and each party shall bear its own costs. If Progenics 
       corrects the cause for alternate manufacture, then Progenics may 
       resume production of affected Product at any time.

5. PRICE 
       [***]




6.     PAYMENT TERMS:
       Net 30 days, following the receipt of a properly prepared and correct 
       invoice.

7.     QUANTITY:
       DuPont commits to purchase 100% of its purchase requirements for sCD4 
       during the term of this order from Progenics, and Progenics agrees to 
       supply 100% of DuPont's purchase requirements.

8.     DELIVERY TERMS:
       F.O.B. Destination, freight pre-paid and added.

9.     RELEASE:
       DuPont will advise Progenics of its purchase requirements at least 
       quarterly, or as may otherwise suit the parties by agreement. 
       Progenics shall ship product as required by DuPont according to a 
       mutually agreed upon schedule. Progenics shall advise DuPont at its 
       earliest opportunity if it is unable to ship Product at an agreed upon 
       time. Progenics will, on a best effort basis, attempt to fulfill any 
       unscheduled, or spot requirements of DuPont.

10.    LABELLING AND SHIPPING:
       Progenics' name and logo will appear on the main kit label (not on 
       components) on manual and on promotional literature, along with 
       DuPont's. All labels to be approved by both parties.

       Product will be shipped Federal Express Priority I on dry ice. In 
       parallel, Progenics will perform stability studies on lyophilized 
       product. Shelf life of the sCD4 will be no less than 6 months upon 
       receipt by DuPont.


[***] Confidential Treatment Requested

<PAGE>

                              3

11.    CONFIDENTIALITY:
       The parties hereto shall keep confidential all confidential technical 
       information, supplied by one party to the other, shall not disclose or 
       make known to any individual, firm, or corporation, except when 
       authorized in writing to do so by the other party, and shall not use 
       such information for any purpose other than the performance of the 
       obligations provided in this Agreement. The provisions of this clause 
       shall remain binding for five (5) years after the termination of this 
       Agreement.

       Each party shall use the same degree of care to avoid disclosure of 
       confidential technical information as the party employs with similar 
       information of its own which it does not desire to publish or disclose.

       Any confidential information shared between the parties must be 
       identified and labeled in writing as confidential. The confidentiality 
       of and information disclosed verbally must be identified in writing as 
       confidential no more than 14 days after disclosure.

       This obligation shall not apply to information and/or documents which:

       A)  Are or come within the public domain otherwise than as
           a consequence of a breach of the obligations
           hereunder;

       B)  Are known to the receiving party prior to disclosure by
           the other party as shown by the receiving party's
           records;

       C)  Are lawfully disclosed to the receiving party by third
           parties; or

       D)  Are subsequently independently developed by the
           receiving party through no reference whatsoever to
           disclosure hereunder.

12.    WARRANTY:
       Progenics warrants and guarantees that DuPont will not be subject to 
       any patent infringement with respect to sDC4 supplied by Progenics as 
       set forth in paragraph 14. In addition, Progenics warrants and 
       represents that it shall convey good and valid title to material(s) 
       supplied

<PAGE>

                              4


       WARRANTY (Cont'd):
       hereunder and that material(s) supplied hereunder shall meet all of 
       the specifications set forth in Attachment A and shall be free from 
       defects except those caused by misuse or mishandling occurring after 
       such delivery. Progenics shall notify DuPont prior to making any 
       formulation changes in the Product. Progenics further warrants that 
       packaged product will meet the warranty of merchantability and fitness 
       for intended use. In the event of a recall of Product, Progenics 
       agrees to reimburse DuPont for all reasonable costs incurred in the 
       recall.

13.    USE OF MATERIAL:
       Progenics as a co-exclusive licensee to a family of patents owned by 
       Columbia University covering the CD4 gene and protein, will supply 
       DuPont with quantities of sCD4 necessary to meet market demands. 
       DuPont shall be entitled to use such sCD4 supplied by Progenics for 
       the manufacturing of drug screening kits to be sold by DuPont to third 
       parties.

14.    PATENTS:
       [***] and all divisional, continuation, continuation-in-part applications
       thereof, any patent granted on any aforesaid patent application, and any 
       extension, reissue, or reexamination of any patents that may issue 
       thereon as well as any foreign counterparts thereof.  [***]

       Progenics shall defend any suit or proceeding brought against DuPont 
       based on a claim that materials or services purchased hereunder, or 
       any part thereof, furnished by Progenics under this Agreement 
       constitutes an infringement of any patent, copyright, or other 
       proprietary right of any third party provided Progenics is notified 
       promptly in writing and given authority, information, and assistance 
       by DuPont to defend such suits or proceedings.

*** Confidential Treatment Requested


<PAGE>

                              5

       PATENTS (Cont'd):
       Progenics shall assume the responsibility to pay all costs, to 
       include such reasonable attorney fees of defending such suits or 
       proceeding and any damages that may be awarded therein against DuPont, 
       to settle any such claim on such terms and conditions it deems 
       advisable. In case the materials purchased hereunder, or any part 
       thereof, is in such suit or proceeding held to constitute infringement 
       or any patent, copyright, or other proprietary right of any third 
       party, and the use thereof is enjoined, or the settlement made 
       requires the use of services or materials purchased hereunder to be 
       discontinued, Progenics shall, at its own expense, and its option, 
       either procure for DuPont the right to continue using such materials 
       or services, replace the same with non-infringing materials which 
       conform to the available specifications, modify such materials or 
       services in a manner acceptable to DuPont so it becomes 
       non-infringing, or terminate this Agreement.

15.    RELATIONSHIP OF THE PARTIES:
       Nothing contained herein shall be construed to empower either party 
       to act as agent for the other. The parties agree that each of them 
       shall, in relation to its obligations hereunder, be acting as an 
       independent contractor.

       RELATIONSHIP OF THE PARTIES (Cont'd)
       Notwithstanding, neither party shall, during the period of this 
       Agreement, enter into discussions nor create an alternative 
       arrangement with any third party concerning the subject matter herein, 
       without first advising the other party of its intent.

16.    ASSIGNMENT AND SUBCONTRACTING:
       Neither party shall assign or transfer this Agreement, in whole or in 
       part, or any interest arising under this Agreement or subcontract any 
       work hereunder without the prior written consent of the other party. 
       Subject to the provisions of this clause, this Agreement shall insure 
       the benefit of and be binding upon the successors and assigns of the 
       parties.

17.    DOCUMENTS/COMMUNICATIONS:
       Purchase Order Number(s), Line Number(s), and Release Number(s) are 
       to appear on all paper work such as packing lists, invoices and 
       correspondence. Also, Certificates of Analysis (C.O.A.) shall be 
       submitted to DuPont by Progenics for each lot shipped by Progenics.

<PAGE>

                              6

18.    NOTICES:

       Any notices to be given hereunder shall be given in writing and shall 
       be deemed to have been validly given when deposited in the United 
       States mail, properly stamped and addressed to DuPont or Progenics, 
       whichever the case may be, at the addresses shown below or at such 
       other address as may from time to time be designated by such party in 
       a notice to the other party.

       Progenics:                    Progenics Pharmaceutical, Inc.
                                     Old Saw Mill River Road
                                     Tarrytown, NY 10591
                                     Attn: Joel Sendek

       DuPont:                       E.I. DuPont de Nemours and Company
                                     Medical Products Department
                                     549 Albany Street
                                     Boston, MA 02118
                                     Attn: Judith Lima-Ziegler
                                           Materials/Inventory Supervisor

19.    NONDISCRIMINATION:
       Progenics warrants that it has complied with all applicable laws, 
       rules, orders and regulations of governmental authority covering the 
       production, sale and delivery of the Product specified herein, 
       including, but not limited to, Executive Order 11246, and the rules 
       and regulations promulgated thereunder, the Rehabilitation Act of 1973 
       and the Vietnam Era Veterans Readjustment Act of 1974. Further, Progenics
       warrants that in the performance of the services hereunder, it will 
       comply with all applicable provisions of the Fair Labor Standards Act 
       of 1938, as amended.

20.    AUDITS:
       Progenics shall permit no less frequently than once per year, and 
       upon reasonable notice by DuPont, inspections and audits by DuPont 
       during regular business hours of all records and aspects of sCD4 
       manufacture, testing, packaging, labelling and shipping.

21.    CANCELLATION:
       This Agreement may be cancelled by either party upon 120 days written 
       notice to the other party.

<PAGE>

                              7


22.    ENTIRETY:
       This Agreement, together with the Attachments specifically referenced 
       and attached hereto, embodies the entire understanding between DuPont 
       and Progenics, and there are no contracts, warranties, or 
       representations, oral or written, express or implied, with reference 
       to the subject matter hereof which are not merged herein. Except as 
       otherwise specifically stated, no modification hereto shall be of any 
       force or effect unless reduced to writing and signed by both parties 
       and expressly referred to as being modifications of this Agreement.

AGREED & APPROVED:

FOR PROGENICS:                                  FOR DUPONT:
Name:      Paul J. Maddon, M.D., Ph.D.          Name:      Robert M. Hand
Title:     CEO and Scientific Dir.              Title:     Sr. Purchasing Agent
Signature: /s/ Paul J. Maddon                   Signature: /s/ Robert M. Hand
Date:      June 27, 1995                        Date:      June 8, 1995



<PAGE>

                                                                  Exhibit 10.12

This document, when properly executed, shall constitute a Supply Agreement 
between Progenics Pharmaceuticals, Inc. with offices at 777 Old Saw Mill River 
Road, Tarrytown, NY, 10591 ("Progenics") and Intracel Corporation, with offices 
at 359 Allston Street, Cambridge, MA 02139 ("Intracel").

1.  PERIOD OF AGREEMENT: February 1, 1996 through January 31, 1999. After the 
    original term, this Agreement will renew automatically for successive 12 
    month periods unless either party gives notice to the other of its 
    intention not to renew at least 120 days prior to the expiration of the 
    then current term.

2.  MATERIAL: Recombinant HIV-1LAI gp120 (full-length) and recombinant 
    soluble human CD4 produced in a Chinese Hamster Ovary ("CHO") expression 
    system referred to hereafter as "gp120" and "CD4" or together as 
    "Product" (see attached Product Specification Sheets).

3.  MATERIAL SPECIFICATIONS: Material shall be supplied in the form and 
    manner, and must conform in all material respects to the specifications 
    set out in the attached Product Specification Sheets. Alterations to 
    these specifications require the express written consent of each party.

4.  PRICE:
    [***]








5.  MINIMUM PURCHASE: 10 milligrams of gp120 or CD4.

6.  PAYMENT TERMS: Net 30 days, following the receipt of a properly prepared 
    and correct invoice.

7.  DELIVERY TERMS: F.O.B. Tarrytown, NY.

8.  RELEASES: Intracel will advise Progenics of its purchase requirements at 
    least quarterly, or as may otherwise suit the parties by agreement. 
    Progenics shall ship Product as required by Intracel according to a 
    mutually agreed upon schedule. Progenics shall advise Intracel at its 
    earliest opportunity if it is unable to ship Product at an agreed upon 
    time. Progenics will, on a best effort basis, attempt to fulfill any 
    unscheduled, or spot requirements of Intracel.


[***] Confidential Treatment Requested

<PAGE>

9.  LABELING AND PACKAGING: Both Intracel's and Progenics' names shall appear 
    on the main product label, along with the following statement: 
    "Manufactured by Progenics Pharmaceuticals, Inc." Both Intracel's and 
    Progenics' names and logos shall appear on promotional literature, along 
    with the following statement: "Manufactured by Progenics Pharmaceuticals, 
    Inc."

    All labels to be approved by both parties. All product labeling and 
    literature shall contain the phrase "For Laboratory Use." Progenics will 
    package product as 100 micrograms per vial, or in other package sizes as 
    mutually agreed upon by both parties. Product will be shipped on dry ice. 
    Shelf life of the Product will be no less than six (6) months upon 
    receipt by Intracel.

10. CONFIDENTIALITY: The parties hereto shall keep confidential all 
    confidential technical information, shall not disclose or make known to 
    any individual, firm, or corporation, except when authorized in writing 
    to do so by the other party, and shall not use such information for any 
    purpose other than the performance of the obligations provided in this 
    Agreement. The provisions of this clause shall remain binding for five 
    (5) years after the termination of this agreement. Each party shall use 
    the same degree of care to avoid disclosure of confidential technical 
    information as the party employs with similar information of its own 
    which it does not desire to publish or disclose. Any confidential 
    information shared between the parties must be identified and labeled in 
    writing as confidential. The confidentiality of and information disclosed 
    verbally must be identified in writing as confidential no more than 14 
    days after disclosure.

    This obligation shall not apply to information and/or documents which:

    A) Are or come within the public domain otherwise than as a consequence 
    of a breach of the obligations hereunder;

    B) Are known to the receiving party prior to disclosure by the other 
    party as shown by the receiving party's records;

    C) Are lawfully disclosed to the receiving party by third parties; or

    D) Are subsequently independently developed by the receiving party 
    through no reference whatsoever to disclosure hereunder.

11. WARRANTY: Progenics warrants the packaged product hereunder shall meet 
    the specifications set forth in the attached Product Specification Sheets 
    and shall be free from defects except those caused by misuse or 
    mishandling occurring after such delivery. Progenics agrees to notify 
    Intracel prior to making any formulation changes in the Product. 
    Progenics further warrants that packaged product will meet the warranty 
    of merchantability and fitness for intended use. In the event of a recall 
    of Product, Progenics agrees to reimburse Intracel for all reasonable 
    costs incurred in the recall.

<PAGE>

12. USE OF MATERIAL: Progenics shall supply Intracel sCD4 and gp120 to be 
    sold by Intracel to third parties. The material will be used only for 
    research purposes and not for other uses such as clinical diagnostics or 
    therapeutic development. This Agreement is limited to resale of sCD4 and 
    gp120 as packaged at Progenics and does not allow Intracel to modify the 
    Product or combine the Product with other components, with the exception 
    of labeling Product with biotin, HRP, or FITC, which is permitted.

13. RELATIONSHIP OF THE PARTIES: Nothing contained herein shall be construed 
    to empower either party to act as agent for the other. The parties agree 
    that each of them shall, in relation to its obligations hereunder, be 
    acting as an independent contractor.

14. CANCELLATION: This Agreement may be canceled by either party upon 120 
    days written notice to the other party.

15. ENTIRETY: This Agreement, together with the Attachments specifically 
    referenced and attached hereto, embodies the entire understanding between 
    Intracel and Progenics, and there are no contracts, warranties, or 
    representations, oral or written, express or implied, with reference to 
    the subject matter hereof which are not merged herein. Except as 
    otherwise specifically stated, no modification hereto shall be of any 
    force or effect unless reduced to writing and signed by both parties and 
    expressly referred to as being modifications of this Agreement.

    AGREED & APPROVED:

    For Progenics:                                 For Intracel:
    -------------                                  -------------
    Name:      Paul J. Maddon, M.D., Ph.D.     Name:      Cheryl G. Cataldo
    Title:     Chairman & CEO                  Title:     Controller
    Signature: /s/ Paul J. Maddon              Signature: /s/ Cheryl G. Cataldo
    Date:      February 7, 1996                Date:      February 8, 1996



<PAGE>

                                                                 EXHIBIT 10.13

                           License Agreement Between

                  Sloan-Kettering Institute for Cancer Research

                                      and

                        Progenics Pharmaceuticals, Inc.

     THIS LICENSE AGREEMENT, effective November 17, 1994, is
entered into by Progenics Pharmaceuticals, Inc. a corporation of
the State of Delaware, having its principal place of business at
777 Old Saw Mill River Road, Tarrytown, New York 10591 (herein
called LICENSEE), and Sloan-Kettering Institute for Cancer
Research, a not-for-profit membership corporation of the State of
New York, having its principal place of business at 1275 York
Avenue, New York, New York 10021 (herein called LICENSOR).

I. BACKGROUND OF AGREEMENT

1.00     LICENSOR represents that it has certain technology,
patent applications and technical information pertaining to cancer
vaccines with respect to which it is prepared to grant an
exclusive license to LICENSEE.

1.01     LICENSEE wishes to acquire an exclusive license under
selected patents and technical information of LICENSOR for
purposes of developing and commercializing vaccines for the
treatment and prevention of human neoplastic disease worldwide.

1.02     LICENSOR acknowledges that commercialization of LICENSED
PRODUCTS may require LICENSEE to obtain additional licenses and
technologies from others.

II. DEFINITIONS

    As used herein, the following terms shall have the meanings
set forth below:

2.00     DEFINITIONS EXHIBIT means the Exhibit A attached to this
LICENSE AGREEMENT which contains additional defined terms.


<PAGE>

2.01     EFFECTIVE DATE means November 17, 1994 which is the date
upon which this LICENSE AGREEMENT becomes effective.

2.02     LICENSED PATENT(s) shall mean

         a) the following patent applications and patents relating
     to ganglioside vaccines,  intermediates or methods of
     producing them, or methods of, or compositions using, them
     which are owned by LICENSOR
     [***]

               (i) U.S. Patent Application No. 08/009,268 (Filed
           January 22, 1993) all patents issuing therefrom and all
           divisions, continuations, reissues, substitutes, and
           extensions thereof and the foreign equivalents thereof;


           [***]

                (ii) all patents and patent applications, whether filed 
            before or after the EFFECTIVE DATE of this Agreement, which 
            claim priority under 35 U.S.C. Sec. 119 or the benefit of the 
            filing date under 35 U.S.C. Sec. 120 of the patent applications 
            and patents of subparagraph (i), but only to the extent of subject 
            matter in such applications and patents for which priority or 
            benefit is claimed.





         [***]

          b) any developments related to or arising out of the subject matter 
      described in a) above which are dominated by the patent applications or 
      patents described in a) above or [***]





2.03     LICENSED TERRITORY means worldwide.

2.04     LICENSED FIELD means, and is limited to, the practice of
the LICENSED PATENTS and TECHNICAL INFORMATION for

         a) the treatment or prevention of neoplastic human
     disease with any of the following:

     [***]




                                     -2-

*** Confidential Treatment Requested

<PAGE>


         [***]









         [***]

         b) the treatment or prevention of human cancer using other 
     ganglioside vaccines [***]

2.05     LICENSED PRODUCT(S) means any and all products which fall
within the LICENSED FIELD and which would infringe the claims of
LICENSED PATENT(S) but for this LICENSE AGREEMENT or are produced
or used using a process or method that would infringe but for this
LICENSE AGREEMENT a claim of a LICENSED PATENT or were developed
using TECHNICAL INFORMATION.

2.06     LICENSED TECHNOLOGY means the LICENSED PATENT(S) and the
TECHNICAL INFORMATION.


2.07     LICENSE AGREEMENT means the license agreement, defined by
the document in which this paragraph appears.  This LICENSE
AGREEMENT is between Sloan-Kettering Institute for Cancer
Research, as LICENSOR, and Progenics Pharmaceuticals, Inc., as
LICENSEE.  Also included in this LICENSE AGREEMENT are all
Exhibits attached hereto and all amendments which may be made
thereto.

2.08     TECHNICAL INFORMATION means unpublished research and
development information, unpatented inventions, know-how, trade
secrets, and technical data in the possession of LICENSOR at the
effective date of this LICENSE AGREEMENT which are needed to
produce or gain government approvals to market LICENSED PRODUCT(S)
and which LICENSOR has the right to and will provide to LICENSEE
upon request. However, TECHNICAL INFORMATION does not include
patient names. Information and materials shall no longer be
considered to be TECHNICAL INFORMATION if such information or
materials cease to be CONFIDENTIAL INFORMATION.


                                    -3-

[***] Confidential Treatment Requested

<PAGE>





III. LICENSE GRANT


3.00     LICENSOR hereby grants to LICENSEE to the extent of the
LICENSED FIELD and LICENSED TERRITORY, a license under LICENSED
PATENTS and TECHNICAL INFORMATION to make, have made, use, sell,
have sold and develop LICENSED PRODUCTS.  No license under
LICENSED PATENTS and TECHNICAL INFORMATION is granted, and no
license should be implied, with respect to activities of LICENSEE
outside the LICENSED FIELD.

3.01     The license granted to LICENSED PATENTS pursuant to
paragraph 3.00 hereof shall be exclusive, with the right to grant
sublicenses, subject to the provisions in Article VI of this
LICENSE AGREEMENT. The license granted to TECHNICAL INFORMATION
pursuant to paragraph 3.00 shall be exclusive for the LICENSED
FIELD with the right to grant sublicenses, subject to the
provisions in Article VI of this LICENSE AGREEMENT.


3.02     The license granted in Article III shall be granted to
AFFILIATES of LICENSEE upon receipt of written notification to
LICENSOR.  On the EFFECTIVE DATE, the license is granted to
LICENSEE's AFFILIATE Active Biotherapies, Inc., 777 Old Saw Mill
River Road, Tarrytown, New York 10591.

3.03     Without limiting the foregoing license grants, LICENSOR
agrees that this grant will extend to and authorize the
manufacture, sale, lease or other transfer of LICENSED PRODUCTS,
LICENSED PATENTS and TECHNICAL INFORMATION through an AFFILIATE or
a DISTRIBUTOR and shall authorize END USERS' use of LICENSED
PRODUCTS, LICENSED PATENTS AND TECHNICAL INFORMATION transferred
by LICENSOR to LICENSEE's AFFILIATE or DISTRIBUTORS.

3.04     All rights granted in this LICENSE AGREEMENT are
expressly granted subject to the rights of the GOVERNMENT pursuant
to 35 U.S.C. Sections 200 ET SEQ., as amended, and the
implementing regulations, and such rights are specifically
reserved by this LICENSE AGREEMENT to the GOVERNMENT. If LICENSOR
is required to grant licenses pursuant to the statutory and
regulatory requirements referred to in this paragraph, or if the
license granted to LICENSEE under this LICENSE AGREEMENT is
otherwise modified or limited by the GOVERNMENT pursuant to such
requirements, LICENSOR and LICENSEE shall negotiate in good faith


                                    -4-


<PAGE>




a reduction of the license fees and royalties payable hereunder
and such other amendments of this LICENSE AGREEMENT as may be
appropriate under the circumstances.

3.05     Notwithstanding the exclusive field license granted
herein, LICENSOR specifically reserves the rights to manufacture,
or use the LICENSED PATENTS, LICENSED PRODUCTS and TECHNICAL
INFORMATION for its own internal purposes, including continuing
research, development, testing, clinical use and all other
internal uses. LICENSOR may have the LICENSED PRODUCTS
manufactured by third parties solely for LICENSOR's internal use
provided any such third party agrees in writing (a) not to use the
TECHNICAL INFORMATION except for such purpose and (b) not to
disclose the TECHNICAL INFORMATION to others.  LICENSOR also
reserves the right to permit other entities or individuals to use
the LICENSED PATENTS, LICENSED PRODUCTS, and TECHNICAL INFORMATION
solely for academic research purposes provided such other entities
or individuals agree in writing (a) to use the same only for
academic research purposes, (b) not to provide the same to other
entities or individuals and (c) not to disclose the TECHNICAL
INFORMATION to others.


3.06     Provided LICENSOR's AFFILIATE(S) is capable and accepts,
LICENSEE hereby grants to LICENSOR's AFFILIATE(S) a right of first
refusal to function as a site at which the clinical tests or
trials of any LICENSED PRODUCT(S) are performed. Such right of
first refusal shall mean that LICENSEE shall request a proposal
from LICENSOR setting forth the procedures which LICENSOR would
follow in the tests and the associated costs. If LICENSEE decides
not to accept LICENSOR's proposal then LICENSEE may only contract
with a clinical test site(s) whose proposal is more favorable
(taken as a whole) to LICENSEE than that proposed by LICENSOR.

IV. LICENSE FEES AND ROYALTY

4.00     LICENSEE shall, as a license fee, pay to LICENSOR the sum
[***]






                                    -5-

[***] Confidential Treatment Requested


<PAGE>



[***]




4.01     LICENSEE shall pay to LICENSOR a royalty of 
         [***]




4.02     If at the time of the sale of a LICENSED PRODUCT a patent 
application is still pending and no valid claims have issued which 
such LICENSED PRODUCT would infringe then the royalty rate for 
such LICENSED PRODUCT shall be [***] 
                 Once such claim(s) issue the royalty rate for a 
LICENSED PRODUCT covered by such claim shall be as set forth in 
paragraph 4.01.


4.03     In the event that a LICENSED PATENT is abandoned or
expires or if all of its claims are finally declared invalid by a
non-appealable decision of a court of competent jurisdiction
through no fault or cause of LICENSEE, [***]





V. MINIMUM ROYALTIES AND DEVELOPMENT EFFORTS

5.00     LICENSEE shall pay to LICENSOR royalties and SUBLICENSE
ROYALTIES as stated in Articles IV and VI, but in no event shall
the sum of royalties and SUBLICENSE ROYALTIES for a calendar year
for practice of the LICENSED PATENTS and or use of TECHNICAL
INFORMATION in the LICENSED FIELD and LICENSED TERRITORY be less
than the following minimum royalties during each of the calendar
years indicated:

                                          Minimum Royalty,
Calendar Year                          U.S. $ per Calendar Year*

1995                                         [***]
1996                                          
1997                                          
1998                                          
1999                                          
2000                                          




                                     -6-



[***] Confidential Treatment Requested

<PAGE>


2001                                          [***]
2002 and each calendar year                   
thereafter during the term of
this LICENSE AGREEMENT

- ------------------------------
* Net to LICENSOR after taxes,
if any, withheld at the source.

[***]








5.01    LICENSEE shall use its best reasonable efforts to
develop and market LICENSED PRODUCT(S) for commercial sale and
distribution throughout the LICENSED TERRITORY, and to such end,
LICENSEE, its AFFILIATES or its SUBLICENSEES shall achieve the
following objectives within the designated years following the
date of this LICENSE AGREEMENT in accordance with the following
schedule:


         [***]


















     Failure to achieve these objectives shall result in LICENSOR
having the option to terminate the license granted hereunder,
subject to LICENSEE's right to achieve the missed objective within


                                    -7-

[***] Confidential Treatment Requested

<PAGE>



sixty (60) days of receipt of written notice of termination from
LICENSOR. LICENSOR shall not unreasonably withhold its consent to
any revision in the preceding schedule requested in writing by
LICENSEE and supported by evidence of technical difficulties or
delays in the clinical studies or regulatory process that could
not have been reasonably avoided. Notwithstanding the foregoing,
LICENSOR shall not have a right to terminate the license for the
failure of LICENSEE to meet a goal if such failure is a result of
(i) causes beyond LICENSEE's direct control; (ii) LICENSOR's
failure to meet its obligations hereunder; (iii) infringement of
third party patents; or (iv) actions or inactions of a federal or
state agency whose approval is required for commercial sales.

     At intervals no longer than every twelve months LICENSEE
shall report in writing to LICENSOR's Office of Industrial Affairs
on progress made toward the objectives set forth above.

     LICENSED PRODUCT(s) used, sold, leased, or transferred within
the United States shall be manufactured substantially in the
United States.

     LICENSOR and LICENSEE acknowledge that each may be required
to disclose to the other information which is CONFIDENTIAL
INFORMATION.  Each agrees to take reasonable precautions to
protect such CONFIDENTIAL INFORMATION and preserve its
confidential, proprietary, or trade secret status. Each shall use
at least the same degree of care and precaution as is customarily
used to protect its own CONFIDENTIAL INFORMATION.

5.02    LICENSOR may, by written notice to LICENSEE, terminate
this LICENSE AGREEMENT during any February subsequent to the year
2002, if LICENSEE has not either (a) practiced the LICENSED
PATENTS during the calendar year that precedes each such February
to the extent of generating earned royalties or SUBLICENSE
ROYALTIES as provided by Articles IV and VI of this LICENSE
AGREEMENT in the amount of [***]






                                    -8-


[***] Confidential Treatment Requested

<PAGE>

VI. SUBLICENSING

6.00    The license rights granted under this LICENSE AGREEMENT
shall specifically include the right for LICENSEE to grant
sublicenses.  LICENSEE shall supply LICENSOR with an English
language copy of the executed agreement within thirty (30) days
after the execution of the sublicense agreement.

6.01    Sublicenses shall be transferable only from LICENSEE to
an AFFILIATE of LICENSEE or in connection with a MAJOR CORPORATE
TRANSACTION.

6.02    All sublicenses granted by LICENSEE shall expressly
provide that Articles II (DEFINITIONS), III (LICENSE GRANT), IX
(TERMINATION), X (LITIGATION), XI (RECORDS), XII,
(NONASSIGNABILITY), XIV (NONUSE OF LICENSOR's NAME, etc.), XVI
(MARKING) AND XVIII (EXPORTATION OF TECHNICAL INFORMATION) of this
LICENSE AGREEMENT shall be binding upon the SUBLICENSEE, as if
SUBLICENSEE were a party to this LICENSE AGREEMENT.

6.03    Each sublicense agreement shall include a provision
stating that the sublicense agreement shall automatically be
modified or terminated, in whole or in part, upon any modification
or termination, in whole or in part, of the LICENSE AGREEMENT if,
and to the extent, such modification or amendment to the LICENSE
AGREEMENT is relevant to and affects the terms of the sublicense
agreement. Such modification or termination of the sublicense
agreement shall be consistent with and reflect the modifications
or termination of the LICENSE AGREEMENT. Upon termination of this
LICENSE AGREEMENT for any reason, any sublicensee not then in
default shall have the right to seek a license from LICENSOR.
LICENSOR agrees to negotiate such licenses in good faith under
reasonable terms and conditions.

[***]


6.04    LICENSEE shall pay to LICENSOR a portion ("SUBLICENSE ROYALTIES") of 
all accrued sublicense issue fees and sublicense royalties payable to 
LICENSEE from its SUBLICENSEES under this LICENSE AGREEMENT ("SUBLICENSE 
INCOME") from the Effective Date and during the term of the LICENSED PATENTS 
as follows:  [***]








                                    -9-

*** Confidential Treatment Requested

<PAGE>

[***]






6.05    In the event that SUBLICENSE INCOME becomes accrued and
payable at a time when no valid claims of the LICENSED PATENTS
have issued which would be infringed by the manufacture, sale or
use of a LICENSED PRODUCT, then the SUBLICENSE ROYALTIES specified in 
Paragraph 6.04 shall be reduced as follows: 
[***]



6.06    In the event that a LICENSED PATENT is abandoned or
expires or if all of its claims are finally declared invalid by a
non-appealable decision of a court of competent jurisdiction
through no fault or cause of LICENSEE, [***]





6.07    The SUBLICENSE ROYALTIES shall be paid by LICENSEE to
LICENSOR in conjunction with LICENSEE's earned royalty payments
and shall be accompanied by written reports, as required with the
LICENSEE's earned royalty payments, sufficient to allow LICENSOR
to audit the activities of each SUBLICENSEE.

6.08    The minimum royalty for a year will be creditable
against SUBLICENSE ROYALTIES to the extent and as provided in
paragraph 5.00.

VII. PAYMENTS AND REPORTS, LICENSED PATENT EXPENSES

7.00    Not later than the last day of each November, March,
May and August, LICENSEE shall furnish to LICENSOR a written



                                     -10-

[***] Confidential Treatment Requested

<PAGE>

statement in such detail as LICENSOR may reasonably require of all
amounts due pursuant to Articles IV and VI for the previous
calendar quarter ended the last days of the preceding September,
December, March and June, respectively, and shall pay to LICENSOR
all amounts due to LICENSOR. In the event that the amounts due at
the end of any calendar year do not equal the minimum royalties
specified in paragraph 5.00 for said calendar year, LICENSEE shall
pay to LICENSOR no later than the last day of March of the
following calendar year, the amount required to satisfy the
minimum royalty obligation for said calendar year. Such amounts
are due at the dates the statements are due. If no amount is
accrued during any calendar quarter, a written statement to that
effect shall be furnished.

7.01    Payments provided for in this LICENSE AGREEMENT, when
overdue, shall bear interest at a rate per annum equal to one
percent (1%) in excess of the "PRIME RATE" published by "The Wall
Street Journal" at the time such payment is due, and for the time
period until payment is received by LICENSOR.

7.02    If this LICENSE AGREEMENT is for any reason terminated
before all of the payments herein provided for have been made
(including minimum royalties for the year in which the agreement
is terminated), LICENSEE shall promptly submit a terminal report
and pay to LICENSOR any remaining unpaid balance as of the
termination date even though the due date as above provided has
not been reached.

7.03    LICENSEE shall reimburse LICENSOR for all reasonable
expenses incurred by LICENSOR after the EFFECTIVE DATE of this
LICENSE AGREEMENT in connection with the filing, prosecution and
maintenance of LICENSED PATENTS in the United States.  At
LICENSOR's option, LICENSOR's patent counsel may bill LICENSEE
directly for such expenses and LICENSEE shall remit payment for
any undisputed amounts directly and promptly (within 30 days) to
LICENSOR's patent counsel. If the license should become non-
exclusive then (a) LICENSEE shall only be responsible for its pro
rata share of any patent prosecution expenses and fees incurred
after the license becomes non-exclusive and (b) any person
becoming a licensee thereafter will be required to pay a pro rata
share of such expenses and fees and LICENSEE shall be entitled to
the excess if any of any expenses and fees paid over its pro rata



                                     -11-

<PAGE>

portion assuming that the new licensee had become a licensee at
the time that the license became non-exclusive.

7.04    LICENSOR shall apply for, seek prompt issuance of, and
maintain during the term of this LICENSE AGREEMENT the LICENSED
PATENTS in the United States. LICENSOR will consult with LICENSEE
before seeking any foreign patent protection. If LICENSEE wants
LICENSOR to seek such protection, LICENSOR shall apply for that
protection and LICENSEE shall reimburse LICENSOR for all
reasonable fees and costs as provided. The prosecution, filing
and maintenance of all patents and applications comprising the
LICENSED PATENTS shall be the primary responsibility of LICENSOR.
LICENSOR shall keep LICENSEE fully informed concerning LICENSED
PATENTS, and shall promptly provide to LICENSEE copies of all
correspondence relating to LICENSED PATENTS from the patent
offices in those countries in which patents are filed as well as
copies of all responses thereto. So long as LICENSEE timely
provides comments to LICENSOR concerning the preparation of
responses to Office Actions, LICENSOR's counsel shall give due
consideration to such comments. If LICENSEE does not want to
support the filing, prosecution, or maintenance of any patent
application or patent in a country, LICENSOR may do so, in which
case LICENSEE's rights and obligations to such patent or patent
application in such country shall terminate.

VIII. DISCLAIMER OF WARRANTIES, INDEMNITY AND INSURANCE

8.00    NOTHING IN THIS LICENSE AGREEMENT SHALL BE DEEMED TO BE
A REPRESENTATION OR WARRANTY BY LICENSOR OF THE VALIDITY OF ANY OF
THE LICENSED PATENTS OR TECHNICAL INFORMATION.

     LICENSEE will indemnify and hold LICENSOR harmless against
any and all actions, suits, claims, demands, prosecutions, costs
and expenses (including actual reasonable attorneys' fees) based
on or arising out of this LICENSE AGREEMENT, including, without
limitation, the manufacture, packaging, use, sale, rental or lease
of LICENSED PRODUCTS, even if altered or used for a purpose not
intended, or the use of LICENSED PATENTS or TECHNICAL INFORMATION
by LICENSEE, its AFFILIATES, its SUBLICENSEES or its (or their)
customers and any representation made or warranty given by


                                     -12-

<PAGE>

LICENSEE, its AFFILIATES or SUBLICENSEES with respect to LICENSED
PRODUCTS or LICENSED TECHNOLOGY.

     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 reasonably acceptable to LICENSOR, to
cover the activities of LICENSEE, its AFFILIATES and its
SUBLICENSEES, for minimum limits of [***]
combined single limit for bodily injury and property damage per 
occurrence and in the aggregate.  Such insurance shall include LICENSOR, 
its trustees, directors, officers, employees, and agents as additional
insureds. Prior to any administration of a LICENSED PRODUCT to a
human being, LICENSEE shall furnish to LICENSOR a certificate of
insurance evidencing such coverage, with thirty (30) days' written
notice to LICENSOR of cancellation or material change.

     The insurance required of LICENSOR under this Article VIII
shall be primary coverage; any insurance LICENSOR may purchase
shall be excess and noncontributory. The insurance required of
LICENSEE shall at all times comply with all statutory workers'
compensation and employers' liability requirements covering its
employees with respect to activities performed under this LICENSEE
AGREEMENT.

8.01    Compliance with Governmental Obligations.

         a) LICENSEE, AFFILIATES and SUBLICENSEES shall comply upon
     reasonable notice from LICENSOR with all governmental
     requests directed to either LICENSOR or LICENSEE and provide
     all information and assistance necessary to comply with the
     governmental requests.

         b) LICENSEE shall insure that research, development, and
     marketing under this LICENSE AGREEMENT will comply with all
     government regulations in force and effect including, but not
     limited to, Federal, state and municipal legislation.


                                     -13-

[***] Confidential Treatment Requested

<PAGE>

IX. TERMINATION

9.00    This LICENSE AGREEMENT shall terminate upon the
expiration of the last to expire of the LICENSED PATENTS included
herein, or upon the abandonment of the last to be abandoned of any
patent applications included herein, or 15 years from the date of
FIRST COMMERCIAL SALE, whichever is later, unless the LICENSE
AGREEMENT is sooner terminated. Following termination of this
LICENSE AGREEMENT pursuant to this paragraph, LICENSEE shall have
the right to manufacture, have manufactured, use, sell, have sold,
and develop LICENSED PRODUCTS without further obligations to
LICENSOR.

9.01    LICENSEE may terminate this LICENSE AGREEMENT at any
time upon ninety (90) days' written notice in advance to LICENSOR.
If LICENSOR is not in material breach of the LICENSE AGREEMENT at
the time of termination, then all of the rights, but not the then
accrued liabilities of LICENSEE, its AFFILIATES and SUBLICENSEES,
under the LICENSED TECHNOLOGY shall revert and belong to LICENSOR.
If LICENSEE is not in material breach of the LICENSE AGREEMENT at
the time of termination, then LICENSEE shall have the right for
one year thereafter to dispose of all LICENSED PRODUCTS then in
its inventory, and shall pay royalties thereon, in accordance with
the provisions of this LICENSE AGREEMENT, as though this LICENSE
AGREEMENT had not terminated.

9.02    If either party shall be in default of any obligation
hereunder, or shall be adjudged bankrupt, or become insolvent, or
make an assignment for the benefit of creditors, or be placed in
the hands of a receiver or a trustee in bankruptcy, the other
party may terminate this LICENSE AGREEMENT by giving sixty (60)
days' notice by Registered Mail to the other party, specifying the
basis for termination. If within sixty (60) days after the
receipt of such notice, the party receiving notice shall remedy
the condition forming the basis for termination, such notice shall
cease to be operative, and this LICENSE AGREEMENT shall continue
in full force.

9.03    The word "termination" and cognate words, such as
"term" and "terminate," used in this Article IX and elsewhere in
this LICENSE AGREEMENT are to be read, except where the contrary
is specifically indicated, as omitting from their effect the



                                     -14-

<PAGE>


following rights and obligations, all of which survive any
termination to the degree necessary to permit their complete
fulfillment or discharge:

         a) LICENSEE's obligation to supply a terminal report as
     specified in paragraph 7.02 of this LICENSE AGREEMENT.

         b) LICENSOR's right to receive or recover and
     LICENSEE'S obligation to pay royalties (including minimum
     royalties) accrued or accruable for payment at the time of
     any termination.

         c) LICENSEE's obligation to maintain records under
     paragraph 11.00 of this LICENSE AGREEMENT.

         d) Licenses, releases, and agreements of nonassertion
     running in favor of customers or transferees of LICENSEE in
     respect to products sold or transferred by LICENSEE prior to
     any termination and on which royalties shall have been paid
     as provided in paragraph 4.01 of this LICENSE AGREEMENT.

         e) Any cause of action or claim of either party accrued
     or to accrue, because of any breach or default by the other
     party.

         f) The representation and disclaimer of warranties and
     indemnification obligations of paragraph 8.00.

         g) The confidentiality obligations under paragraph
     5.01.

9.04    In the event LICENSEE is permanently enjoined from
exercising its license rights granted hereunder pursuant to an
infringement action brought by a third party, or if both LICENSEE
and LICENSOR elect not to undertake the defense or settlement of
such a claim of alleged infringement for a period of six months
from notice of such claim or suit, then LICENSEE shall have the
right to terminate this LICENSE AGREEMENT with respect to the
infringing patent claims following thirty (30) days' written
notice to LICENSOR.


                                     -15-

<PAGE>

X. LITIGATION

10.00   Each party shall notify the other party in writing of
any suspected infringements of or by the LICENSED PATENTS in the
LICENSED TERRITORY and shall inform the other party of any
evidence of such infringements.

10.01   INFRINGEMENT OF LICENSED PATENTS DURING EXCLUSIVE
PERIOD. So long as this LICENSE AGREEMENT remains exclusive the
LICENSEE shall have the first right to defend the LICENSED PATENTS
against infringement or interference by other parties in whole or
in part in the LICENSED FIELD in any country in which a LICENSED
PATENT is in effect hereunder, including by bringing any legal
action for infringement or defending any counterclaim of
invalidity or action of a third party for declaratory judgment of
non-infringement or interference. LICENSOR agrees to join as a
party plaintiff in any such lawsuit initiated by LICENSEE and to
cooperate with LICENSEE in LICENSEE's prosecution, if requested by
LICENSEE, with all reasonable costs, attorney fees, and expenses
to be paid by LICENSEE. However, if LICENSEE does not institute
suit for infringements within ninety (90) days of receipt of
written notice from LICENSOR of LICENSOR's desire to bring suit
for infringement in its own name and on its own behalf, then
LICENSOR may, at its own expense, bring suit or take any other
appropriate action. In the event that LICENSEE shall undertake
the enforcement of the LICENSED PATENTS by litigation, LICENSEE
may withhold [***] 
of the payments otherwise thereafter due LICENSOR and apply the 
same toward reimbursement of up to half of LICENSEE's expenses, 
including reasonable attorneys' fees, in connection therewith.  
Any recovery of damages by LICENSEE for each such suit shall be 
applied first in satisfaction of any unreimbursed expenses and 
legal fees of LICENSEE relating to such suit, and next toward 
reimbursement of LICENSOR for any payments past due or withheld 
and applied pursuant to this paragraph. The balance remaining 
from any such recovery shall be retained by LICENSEE.

10.02   INFRINGEMENT OF LICENSED PATENTS DURING NON-EXCLUSIVE
PERIOD. If this LICENSE AGREEMENT is nonexclusive at the time of
infringements, the sole right to institute suit for infringement
and to recover damages shall rest with LICENSOR.


                                     -16-

[***] Confidential Treatment Requested

<PAGE>

10.03   LICENSEE shall be entitled to any recovery of damages
resulting from a lawsuit brought by it pursuant to paragraph
10.01. LICENSOR shall be entitled to recovery of damages resulting
from any lawsuit brought by LICENSOR to enforce any LICENSED
PATENT, pursuant to paragraph 10.01 or 10.02.

10.04   Neither party may settle with any infringer without the
prior approval of the other party if such settlement would affect
the rights of the other party under the LICENSED PATENTS.

10.05   INFRINGEMENT BY LICENSED PATENTS.  Each party shall
promptly notify the other in writing in the event that a third
party shall bring a claim of infringement against LICENSOR or
LICENSEE, either in the United States or in any foreign country in
which there is a LICENSED PATENT.  So long as this LICENSE
AGREEMENT is exclusive, LICENSEE in its own name and at its sole
expense shall have the first right to defend the LICENSED PATENTS
and may compromise, settle or otherwise pursue such defense in
such a manner and on such terms as LICENSEE shall see fit. In the
event that LICENSEE shall undertake such defense, LICENSEE may
withhold [***]
of the payments otherwise thereafter due LICENSOR and apply 
the same toward reimbursement of LICENSEE's expenses, including 
reasonable attorneys' fees, in connection therewith. Any 
recovery of damages by LICENSEE for each such suit shall be 
applied first in satisfaction of any unreimbursed expenses and 
legal fees of LICENSEE relating to such suit, and next toward 
reimbursement of LICENSOR for any payments past due or withheld 
and applied pursuant to this paragraph. The balance remaining 
from any such recovery shall be retained by LICENSEE.

XI. RECORDS

11.00   LICENSEE shall keep accurate records of all operations
affecting payments hereunder, and shall permit LICENSOR or its
duly authorized agent to inspect all such records and to make
copies of or extracts from such records during regular business
hours throughout the term of this LICENSE AGREEMENT and for a
reasonable period of not less than three (3) years thereafter.


                                     -17-

[***] Confidential Treatment Requested

<PAGE>

XII. NONASSIGNABILITY

12.00   The parties agree this LICENSE AGREEMENT imposes
personal obligations on LICENSEE. LICENSEE shall not assign any
rights under this LICENSE AGREEMENT not specifically transferable
by its terms (other than to an AFFILIATE or in connection with a
MAJOR CORPORATE TRANSACTION) without the written consent of
LICENSOR, which shall not be unreasonably withheld, delayed or
conditioned. LICENSOR may assign its rights hereunder but not to
a competitor of LICENSEE.

XIII. SEVERABILITY

13.00   The parties agree that if any part, term, or provision
of this LICENSE AGREEMENT shall be found illegal or in conflict
with any valid controlling law, the validity of the remaining
provisions shall not be affected thereby.

XIV.    NONUSE OF LICENSOR'S NAME AND LICENSOR EMPLOYEES AS
CONSULTANTS, BOARD MEMBERS OR EMPLOYEES


14.00   In publicizing anything made, used, or sold under this
LICENSE AGREEMENT, LICENSEE shall not use the name of LICENSOR or
otherwise refer to any organization related to LICENSOR, except
with the written approval of LICENSOR and except that LICENSEE may
make statements to the effect that (a) it is licensed by LICENSOR
under the LICENSED PATENTS and (b) [***] David A. Scheinberg, M.D., Ph.D. are 
staff of LICENSOR and there  is a relationship between these individuals and 
LICENSEE. LICENSOR shall respond to any such LICENSEE'S request to use 
LICENSOR's name or otherwise refer to any organization related to LICENSOR 
within fourteen (14) days after receiving LICENSEE's request.


LICENSOR shall respond to any such LICENSEE's request to use 
LICENSOR's name or otherwise  refer to any organization related to 
LICENSOR within fourteen (14) days after receiving LICENSEE's request.

14.01   Neither LICENSEE, its AFFILIATES nor its SUBLICENSEES
shall hire as consultants, board members or employees any
individual who is at the same time also an employee of LICENSOR or
its AFFILIATES without first obtaining LICENSOR's prior written
consent to such hiring agreement.[***]
LICENSOR hereby consents to the involvement of  [***]


                                     -18-

*** Confidential Treatment Requested

<PAGE>

[***]
and David A. Scheinberg, M.D., Ph.D. with LICENSEE or its AFFILIATES, 
provided that their involvement is described in separate agreements that have 
been approved by LICENSOR as consistent with LICENSOR's policies.


XV. WAIVER, INTEGRATION ALTERATION

15.00   The waiver of a breach hereunder may be effected only
by a writing signed by the waiving party and shall not constitute
a waiver of any other breach.

15.01   This LICENSE AGREEMENT represents the entire
understanding between the parties, and supersedes all other
agreements, express or implied, between the parties concerning
LICENSED PATENTS and TECHNICAL INFORMATION.

15.02   A provision of this LICENSE AGREEMENT may be altered
only by a writing signed by both parties, except as provided in
paragraph 13.00 above.

XVI. MARKING

16.00   LICENSEE shall place in a conspicuous location on
LICENSED PRODUCTS that would infringe LICENSED PATENTS but for
this LICENSE AGREEMENT, a patent notice in accordance with 35
U.S.C. Section 282. LICENSEE agrees to mark any products made
using a process covered by any LICENSED PATENT with the number of
each such patent and, with respect to such LICENSED PATENTS, to
respond to any request for disclosure under 35 U.S.C. Section
287(b)(4)(B) by only notifying LICENSOR of the request for
disclosure.

XVII. APPLICABLE LAW

17.00   This LICENSE AGREEMENT shall be construed in accordance
with the substantive laws of the State of New York of the United
States of America.


                                     -19-

[***] Confidential Treatment Requested

<PAGE>

XVIII. EXPORTATION OF TECHNICAL INFORMATION

18.00   LICENSEE agrees to comply with the laws and rules of
the GOVERNMENT regarding prohibition of exportation of TECHNICAL
INFORMATION furnished to LICENSEE either directly or indirectly by
LICENSOR.

XIX. NOTICES UNDER THE LICENSE AGREEMENT


19.00   For the purpose of all written communications and
notices between the parties, their addresses shall be:

LICENSOR:            Mr. James S. Quirk
                     Senior Vice President
                     Research Resources Management
                     Sloan-Kettering Institute for Cancer Research
                     1275 York Avenue
                     New York, New York 10021

LICENSEE:            Paul J. Maddon, M.D., Ph.D.
                     Chairman, President and CEO
                     Progenics Pharmaceuticals, Inc.
                     777 Old Saw Mill River Road
                     Tarrytown, New York 10591

or any other addresses of which either party shall notify the
other party in writing.



                                     -20-

<PAGE>

     IN WITNESS WHEREOF the parties have caused this LICENSE
AGREEMENT to be executed by their duly authorized officers on the
respective dates hereinafter set forth.

                                   LICENSEE
                        PROGENICS PHARMACEUTICALS, INC.

By:                           /s/ Paul A. Maddon
   -------------------------------------------------------------------------
Title:                         Chairman and CEO
      ----------------------------------------------------------------------
Date:                          November 17, 1994
     -----------------------------------------------------------------------

                                   LICENSOR
                 SLOAN-KETTERING INSTITUTE FOR CANCER RESEARCH

By:                            /s/ Javier S. Furl
   -------------------------------------------------------------------------
Title:                        Senior Vice President
      ----------------------------------------------------------------------
Date:                          November 22, 1994
     -----------------------------------------------------------------------


                                     -21-

<PAGE>

                                   Exhibit A

                               DEFINITIONS EXHIBIT

Part 1: Additional licensing terms.

E1.01      AFFILIATES means, with respect to a party of this
LICENSE AGREEMENT, any individual or entity which directly or
indirectly controls, is controlled by, or is under common control
with such party. The term "control" means possession, direct or
indirect, of the powers to direct or cause the direction of the
management or policies of a person or ENTITY; whether through
ownership of equity participation, voting securities, or
beneficial interests; by contract; by agreement; or otherwise.
Also, with respect to LICENSOR, AFFILIATES includes Memorial
Hospital for Cancer and Allied Diseases and Memorial Sloan-
Kettering Cancer Center, each a not-for-profit membership
corporation of the State of New York, each having its principal
place of business at 1275 York Avenue, New York, New York 10021.

E1.02       CONFIDENTIAL INFORMATION means the collection of
technical information included in the LICENSED TECHNOLOGY or
technical information of LICENSEE and confidential non-public
information concerning LICENSEE's business plans, strategy and the
like. All information which shall be disclosed in confidence by
the disclosing party to the receiving party, and which affords a
competitive advantage to the disclosing party or its AFFILIATES,
shall be presumed to be CONFIDENTIAL INFORMATION, even though
limited portions of such technical information may be in the
public domain.

The following information shall be excluded from the
definition of CONFIDENTIAL INFORMATION: (a) information which the
receiving party demonstrates was in the receiving party's
possession in written or other tangible form prior to any
disclosure; (b) information which the receiving party demonstrates
was received from a third party without restriction and not in
violation of any duty of nondisclosure on the part of such third
party; (c) information which is independently discovered or
invented by personnel of a party who do not have direct or


                                     -22-

<PAGE>

indirect access to the information provided to that party by the
other party, or (d) from the time it becomes so known, any
information which the receiving party demonstrates was generally
known to the trade. Information shall not be considered to be
generally known to the trade if, in order to acquire such
information from publicly available sources, the receiving party
used the disclosing party's CONFIDENTIAL INFORMATION to guide it
in reviewing such sources in order to select therefrom a series of
relatively unconnected information which may be fit together to
match the CONFIDENTIAL INFORMATION first learned from the
disclosing party.

E1.03       DISTRIBUTOR means any person or ENTITY engaged by
LICENSEE, or any agent or representative of LICENSEE, to
distribute any LICENSED PRODUCT(S) either directly or indirectly
through other distributors.

E1.04       END USER means any person licensed or otherwise
authorized to USE LICENSED PRODUCT(S) for his/her own personal
use, or any ENTITY licensed to USE LICENSED PRODUCT(S) in the
regular conduct of its own business and not for licensing to other
entities or individuals.

E1.05       ENTITY means a corporation, an association, a joint
venture, a partnership, a trust, a business, an individual, a
government or political subdivision thereof, including an agency,
or other organization which can exercise independent legal
standing.

E1.06       FIRST COMMERCIAL SALE means the date that the LICENSED
PRODUCT(S) are first sold, marketed or publicly made available.
LICENSED PRODUCT(S) distributed or used for clinical trials or
experimental purposes only shall not be considered marketed or
made available and shall not establish the FIRST COMMERCIAL SALE.

E1.07       GOVERNMENT means the Federal Government of the United
States of America.

E1.08      MAJOR CORPORATE TRANSACTION means (a) the sale of all
or substantially all of the business to which the licenses granted
under this LICENSE AGREEMENT relate or (b) the merger of the


                                     -23-

<PAGE>

LICENSEE with or into or the consolidation of the LICENSEE with
another ENTITY.

[***]



























E1.010     SUBLICENSEE means any ENTITY, not an AFFILIATE of
LICENSEE, which is licensed by LICENSEE, pursuant to this
authority granted in this LICENSE AGREEMENT, which has rights to
LICENSED TECHNOLOGY beyond those rights commonly granted to an END
USER.

E1.011     USE means any form of practice or utilization of the
LICENSED TECHNOLOGY, or any portion thereof.


                                     -24-

[***] Confidential Treatment Requested

<PAGE>

Part 2:  Technical Terms.

[***]

E2.01       BCG means bacille de Calmette et Guerin, a nonspecific immune 
stimulant.

E2.02       DERIVATIVES means a chemical substance derived from another 
substance either directly or by modification or partial substitution.


[***]





E2.03       FDA means the Food and Drug Administration of the
GOVERNMENT.

[***]







E2.06       GMP means good manufacturing practices as defined by
the FDA of the GOVERNMENT.


[***]
E2.07       KHL means keyhole limpet hemocyanin.

E2.08       NDA means New Drug Application as defined by the FDA of
the GOVERNMENT.

[***]







                                     -25-

[***] Confidential Treatment Requested



 <PAGE>

                                                               Exhibit 10.14

                           CLINICAL TRIAL AGREEMENT

      THIS AGREEMENT is made and entered into as of the 12th day of December, 
1994 (hereinafter "Effective Date") by and between

      SLOAN-KETTERING INSTITUTE FOR CANCER RESEARCH and its affiliate, 
MEMORIAL HOSPITAL FOR CANCER AND ALLIED DISEASES, both having a principal 
place of business at 1275 York Avenue, New York, New York 10021, membership 
corporations of the State of New York (hereinafter "SKI/MEMORIAL") and

      ACTIVE BIOTHERAPIES, INC., a corporation of the State of Delaware 
having its principal place of business at 777 Old Saw Mill River Road, 
Tarrytown, New York 10591, (hereinafter "ABI").

                                 WITNESSETH

      WHEREAS, SKI/MEMORIAL has established and maintains a Clinical 
Immunology Service, a Division of Hematologic Oncology, in the Department of 
Medicine and has acquired expertise in conducting research investigations, 
clinical trials and laboratory test evaluations; and

      WHEREAS, ABI conducts business in the development, manufacture and sale 
of therapeutic products; and

      WHEREAS, ABI desires SKI/MEMORIAL to conduct a clinical trial to 
determine the safety and efficacy of GM2 covalently attached to KLH plus the 
immunological adjuvant QS-21 in patients with melanoma (hereinafter "GM2-KLH 
conjugate"), said trial entitled

      VACCINATION OF MELANOMA PATIENTS WITH GM2 COVALENTLY ATTACHED TO KLH 
      (GM2-KLH) PLUS THE IMMUNOLOGICAL ADJUVANT QS-21: TRIAL COMPARING DOSES OF 
      GM2-KLH

(hereinafter the "Study").

       NOW, THEREFORE intending to be legally bound and upon the terms, 
conditions and covenants hereinafter set forth, SKI/MEMORIAL and ABI agree as 
follows:

                           ARTICLE I - THE STUDY

       1.1 The Study under this Agreement will be conducted under the protocol 
approved by SKI/MEMORIAL's Human Subject Institutional Review Board 
(hereinafter "IRB"), based on the protocol annexed hereto as Exhibit A 
(hereinafter "Protocol"). SKI/MEMORIAL shall submit the Protocol for approval 
to the IRB.    ABI shall supply Study drug after ABI has:

                                       1

<PAGE>

       a.  received a mutually executed copy of this Agreement;

       b. received documentation from the Office of Industrial Affairs that 
          SKI/MEMORIAL's IRB has approved the Protocol;

       Promptly after SKI/MEMORIAL's IRB has approved the final Protocol, the 
Principal Investigator shall forward a copy to the Office of Industrial 
Affairs, and the Office of Industrial Affairs shall forward a copy to ABI. 
The Principal Investigator shall also forward to the Office of Industrial 
Affairs any subsequent change to the Protocol, and the Office of Industrial 
Affairs shall forward the change to ABI.

       1.2 As part of this Agreement, SKI/MEMORIAL shall appoint Dr. Paul B. 
Chapman and/or such other physicians as it may deem appropriate as 
investigators (hereinafter "Investigators") to oversee the Study. If Dr. 
Chapman should become unable to complete the Study, SKI/MEMORIAL shall 
consult with ABI regarding the appointment of a new principal investigator. 
SKI/MEMORIAL will negotiate in good faith to select a new principal 
investigator so that the Study can continue.

       1.3 The Investigators on behalf of SKI/MEMORIAL shall prepare and 
maintain records and case histories with all pertinent data documented as 
required by the Protocol on case report forms supplied by ABI. All patient 
data shall be kept confidential. Information provided to ABI shall not 
disclose patient names, except to the extent that the patient consent form 
permits.

       1.4 The Investigators shall also immediately notify ABI of any adverse 
reaction in the course of the Study of which they become aware.

       1.5 All applicable government laws, rules, regulations and guidelines, 
including those of the United States Food and Drug Administration 
(hereinafter the "FDA"), shall be adhered to by SKI/MEMORIAL and ABI in the 
performance and documentation of the Study.

       1.6 ABI shall provide SKI/MEMORIAL with any investigational protocols, 
pre-clinical or background information which are germane to the Study.

       1.7 ABI shall provide, without cost to SKI/MEMORIAL, sufficient 
amounts of its GM2-KLH conjugate to SKI/MEMORIAL to conduct the Study. 
SKI/MEMORIAL may not use this GM2-KLH conjugate in any way other than as 
specified in the Protocol.

                                       2

<PAGE>

       1.8 SKI/MEMORIAL shall use reasonable efforts to obtain an 
institutional IND for purposes of conducting the Study. At ABI's request any 
time in the three years after the Effective Date, SKI/MEMORIAL will assign 
the IND to ABI at no additional charge and write a letter to the FDA to 
inform them of the assignment of the IND to ABI. ABI shall indemnify 
SKI/MEMORIAL for any use ABI makes of the IND after SKI/MEMORIAL has assigned 
it to ABI, including attorney fees.

                       ARTICLE II - SKI/MEMORIAL STAFF AND FACILITIES

       2.1 The Study shall be carried out at SKI/MEMORIAL under the 
supervision of SKI/MEMORIAL's IRB and the Investigators indicated above.

       2.2 SKI/MEMORIAL shall provide the physician, laboratory, statistical, 
and clinical support staff levels of effort required to complete the Study.

                                   ARTICLE III- REPORTS

       3.1 SKI/MEMORIAL shall keep ABI advised of the status of the Study via 
periodic reports. The frequency of such reports shall be mutually agreed to 
by both parties. There shall also be a final report of the Study presented to 
ABI.

       3.2 All reports submitted to ABI shall become the property of ABI and 
may be used by ABI without, however, making any reference to Memorial 
Sloan-Kettering Cancer Center, Memorial Hospital for Cancer and Allied 
Diseases or Sloan-Kettering Institute for Cancer Research, unless such 
reference appears in a communication with the FDA or as otherwise required by 
law. If ABI desires to make reference to any of the foregoing in utilizing 
the results of the Study, ABI must first obtain written consent from 
SKI/MEMORIAL. SKI/MEMORIAL shall respond to any such ABI's request for 
release of information within thirty (30) days after receiving ABI's request.

                          ARTICLE IV - PUBLICATION

       4.1 Notwithstanding anything contained herein to the contrary including 
without limitation Articles 5.1 and 9.6, SKI/MEMORIAL may freely publish the 
results of its investigative findings hereunder. The authorship and contents 
(including scientific conclusions and professional judgments) of any paper 
submitted shall be determined by SKI/MEMORIAL. SKI/MEMORIAL shall provide ABI 
with a copy of the papers prepared for publication prior to their submission 
to a scientific journal or presentation at scientific meetings. ABI shall 
have thirty (30) days to review the papers. ABI shall not make any editorial 
changes in the papers, but may delete any of its Confidential Information (as 
defined below) contained therein. ABI personnel shall be acknowledged with 
customary scientific practice.

                                       3

<PAGE>

                  ARTICLE V - CONFIDENTIAL INFORMATION

       5.1 In order to effectively complete the Study, it may be necessary or 
desirable for the parties to disclose proprietary, trade secret and/or other 
confidential information (herein "Confidential Information") to one another. 
Each party agrees that any such Confidential Information disclosed to it or 
to its employees shall be used only in connection with the legitimate 
purposes of this Agreement; shall be disclosed only to those who have a need 
to know it, and shall be safeguarded with the same care normally afforded 
such Confidential Information in the possession, custody or control of the 
party receiving the Confidential Information provided, however, that the 
disclosing party specifies in writing the nature and identity of the 
Confidential Information and the manner and time of disclosure. The foregoing 
shall not apply when, after and to the extent the Confidential Information 
disclosed becomes generally available to the public through no fault of the 
receiving party, was already known to the receiving party at the time of 
disclosure as evidenced by written records in the possession of the receiving 
party prior to such time, or is subsequently received by the receiving party 
in good faith from a third party without breaching any confidential 
obligation between the third party and the disclosing party.

                           ARTICLE VI - COMPENSATION

[***]















       6.2 SKI/MEMORIAL shall discuss, if ABI so requests, budgetary matters 
with ABI, but reserves the right to be the final control on budgetary 
categories and expenditures. SKI/MEMORIAL shall not be obligated to provide 
expenditure reports, or to submit to audits by ABI.

                                       4

[***] Confidential Treatment Requested

<PAGE>

       6.3 The checks shall be made payable to SLOAN-KETTERING INSTITUTE FOR 
CANCER RESEARCH (Sloan-Kettering Institute Tax I.D. No. 13-1624182) and shall 
be forwarded to:

       Memorial Sloan-Kettering Cancer Center
       Office of Industrial Affairs 
       1275 York Avenue 
       New York, New York 10021

ABI should note on its check stub or in its transmittal letter that the 
payment relates to a Clinical Trial Agreement, SK#1267, under the direction 
of Dr. Paul B. Chapman.

                      ARTICLE VII - INDEPENDENT CONTRACTOR

       7.1 Both parties shall, at all times during the performance of this 
Agreement, remain as independent contractors and the Agreement shall not make 
the parties partners, joint venturers, or agents of one another. No party to 
this Agreement shall have the power to bind or obligate the other party.

                      ARTICLE VIII - TERM AND TERMINATION

       8.1 This Agreement shall commence on the Effective Date of this 
Agreement and shall continue until completion as provided in the Protocol, 
which is estimated at about twelve (12) months from the date hereof.

       8.2 This Agreement can be terminated by either SKI/MEMORIAL or ABI 
with or without cause upon thirty (30) days prior written notice without 
penalty to either party.

       8.3 In the event that a.) SKI/MEMORIAL terminates this Agreement prior 
to completion of the Study, the amount due to SKI/MEMORIAL from ABI shall be 
[***]

any time between the Effective Date and the date of termination of this 
Agreement and then completes the Protocol; or b.) ABI terminates this 
Agreement then in addition to [***]

       8.4 If ABI terminates the Agreement prior to completion of the Study, 
ABI shall, if permitted by law and requested by SKI/MEMORIAL, supply 
SKI/MEMORIAL, free of charge, with sufficient GM2-KLH conjugate to allow 
SKI/MEMORIAL to complete the treatment of those patients participating in the 
Study on the date of SKI/MEMORIAL's receipt of ABI's termination notice.

                                       5

*** Confidential Treatment Requested

<PAGE>

       8.5 Sections 3.2, 4.1, 5.1, 8.3, 8.4, 8.5, 9.1, 9.6 and 9.7 shall all 
survive the termination of this Agreement.

                               ARTICLE IX - GENERAL

       9.1 ABI shall indemnify, defend and hold SKI/MEMORIAL, and its 
affiliate corporation, Memorial Sloan-Kettering Cancer Center harmless from 
and against all claims, causes of action, suits, damages and costs arising 
out of, resulting from, or otherwise in respect of, the manufacture, sale 
and/or use of GM2-KLH conjugate except where such claims, causes of action, 
suits, damages and costs are the result of negligence on behalf of 
SKI/MEMORIAL, its staff or agents. ABI shall have no obligation to indemnify, 
defend or hold SKI/MEMORIAL harmless against liability, loss or damage 
arising from a failure by SKI/MEMORIAL, its staff or agents to; (i) comply 
with any applicable FDA or other governmental requirement or; (ii) adhere to 
the terms of the Protocol.

       SKI/MEMORIAL shall indemnify, defend and hold ABI harmless from and 
against all claims, causes of action, suits, damages and costs arising out 
of, resulting from, or otherwise in respect of, the manufacture, sale and/or 
use of GM2-KLH conjugate except where such claims, causes of action, suits, 
damages and costs are the result of negligence on behalf of ABI, its staff or 
agents. SKI/MEMORIAL shall have no obligation to indemnify, defend or hold 
ABI harmless against liability, loss or damage arising from a failure by ABI, 
its staff or agents to; (i) comply with any applicable FDA or other 
governmental requirement or; (ii) adhere to the terms of the Protocol.

       9.2 No right or license is granted under this Agreement by either 
party to the other either expressly or by implication, except those 
specifically set forth herein.

       9.3 Nothing contained within this Agreement shall impose an obligation 
of exclusivity on one party by the other. Both parties reserve the right to 
enter into and participate in other activities (either alone or with a third 
party) including, but not limited to, clinical trials and sponsored research 
projects.

       9.4 All matters affecting the interpretation, validity and performance 
of this Agreement shall be governed by the laws of the State of New York 
applicable to agreements made and to be performed wholly within the State of 
New York. This Agreement, including the Protocol, sets forth the entire 
understanding between the parties

                                       6

<PAGE>

herein, and cannot be changed or amended except by written agreement executed 
by the parties.     In the event of any inconsistency in this Agreement, the 
inconsistency shall be resolved by giving precedence first, to the Articles 
of this Agreement, and then, to the Protocol. This Agreement may not be 
assigned by either party without the prior written consent of the other party.

       9.5 All notices to be given by either party to the other shall be made 
in writing by hand delivery or by registered or certified mail, return 
receipt requested and addressed to the parties at the following addresses 
respectively:

       Sloan-Kettering Institute for Cancer Research
       1275 York Avenue
       New York, New York 10021

       (Attention: Director, Office of Industrial Affairs)
       (Copy:      James S. Quirk, Senior Vice President)

       Active Biotherapies, Inc.
       777 Old Saw Mill River Road
       Tarrytown, New York 10591

       (Attention: Paul J. Madddon, M.D., Ph.D.
                   President and CEO)

Any notice shall be effective as of its date of receipt.

       9.6 Except as set forth in articles 5.1 and 4.1, as required by law 
and/or as may be required in order to maintain a party's status as an exempt 
organization under Section 501(c) (3) of the Internal Revenue Code and 
regulations thereunder, neither SKI/MEMORIAL nor ABI shall release any 
information, publicity, news releases or other public announcement, written 
or oral, with regard to the Agreement or any amendment thereto or to 
performance hereunder, to newspapers or any other mass communication media 
without the prior written approval of the other party. SKI/MEMORIAL shall 
respond to any such ABI's request for release of information within thirty 
(30) days after receiving ABI's request. ABI shall not use the name of 
Memorial Sloan-Kettering Cancer Center, Memorial Hospital for Cancer and 
Allied Diseases or Sloan-Kettering Institute for Cancer Research, or a 
variant of any of the foregoing in any advertising, packaging or other 
promotional material in connection with the GM2-KLH conjugate except as may 
be required by law.

                                       7

<PAGE>

       IN WITNESS THEREOF, SKI/MEMORIAL and ABI have caused this Agreement to 
be executed in duplicate by their respective duly authorized officers.

ACTIVE BIOTHERAPIES, INC.              SLOAN-KETTERING INSTITUTE
                                       FOR CANCER RESEARCH, AND

By: /s/ Paul J. Maddon                 MEMORIAL HOSPITAL FOR AND
   ---------------------------         ALLIED DISEASES
Paul J. Maddon, M.D., Ph.D.
 President and CEO

Date:  Dec. 23, 1994                 By: /s/ James S. Quirk
     ----------                         -------------------------------
                                             James S. Quirk
                                          Senior Vice President
                                        Research Resources Management

                                     Date: Dec. 12, 1994
                                          -------

                                     By: /s/ Paul B. Chapman
                                        -------------------------------
                                            Paul B. Chapman, M.D.
                                            Principal Investigator

                                     Date: Dec 4, 1994
                                           -------

                                       8


<PAGE>

                                                              Exhibit 10.15





LICENSE AND SUPPLY AGREEMENT




      This license and supply agreement is entered into as of August 31 , 
1995 (the "Effective Date") between Cambridge Biotech Corporation, debtor and 
debtor in possession, Case No. 94-43054-IFQ, United States Bankruptcy Court 
for the District of Massachusetts, Western Division, a Delaware corporation, 
having offices at 365 Plantation Street, Worcester, Massachusetts 01605, and 
Progenics Pharmaceuticals, Inc., a Delaware corporation having offices at 777 
Old Saw Mill River Road, Tarrytown, New York 10591 (each singularly a "Party" 
and collectively the "Parties") with reference to the following:


                                   RECITALS


      WHEREAS, CBC is performing research and development in the field of 
purified saponin extracts from the tree Quillaja saponaria, production 
processes therefor and uses thereof as an immune adjuvant; and

      WHEREAS, Progenics is performing research and development in the field 
of vaccines for human cancers and is interested in licensing CBC's rights to 
such purified saponin extracts for use as an immune adjuvant with such 
vaccines;

      THEREFORE, the parties agree as follows:


1.    DEFINITIONS. The following terms shall have the following meanings for 
purposes of this Agreement:

      1.1   "ACTIVE DEVELOPMENT EFFORT" is defined in Section 5.1.


                                      [***]



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      1.3   "ADJUVANT REQUIREMENTS" means the amount of Adjuvant in bulk 
            which Progenics and its sublicensees may require pursuant to the 
            provisions hereof for all research and development, pre-clinical 
            and human clinical testing of Licensed Products and, after 
            Commercial Introduction, production of Licensed Products for 
            comme'rcial sales.

      1.4   "AFFILIATE" means any corporation, firm, partnership or other
            entity, whether de jure or de facto, which directly or indirectly 
            owns, is owned by, or is 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.

      1.5   "AGREEMENT" means this License and Supply Agreement, including
            any exhibits, schedules or other attachments thereto, as any of the
            foregoing may be validly amended from time to time.

      1.6   "CBC" means Cambridge Biotech Corporation, a Delaware corporation,
            its Affiliates, and its successors and permitted assigns.

      1.7   "cGLPs" means the current Good Laboratory Practices for Finished 
            Pharmaceuticals pursuant to 21 C.F.R. 58 et seq., as amended from 
            time to time.

      1.8   "cGMPs" means the current Good Manufacturing Practices for 
            Finished Pharmaceuticals pursuant to 21 C.F.R. 210 et seq., as 
            amended from time to time.

      1.9   "COMMERCIAL INTRODUCTION" means on a country-by-country basis the 
            date of first commercial sale (other than for purposes of 
            obtaining regulatory approval) of a Licensed Product by Progenics 
            or its sublicensees in such country.

      1.10  "EFFECTIVE DATE" is defined in the introductory paragraph.

      1.11  "FIELD OF USE" means vaccines containing purified GM2 and GD2 
            ganglioside preparations (whether alone or in combination with each 
            other) for the prevention or treatment of human cancers.

      1.12  "FULLY BURDENED MANUFACTURING COST" means the actual cost of
            Manufacture by CBC of the Adjuvant under a Manufacturing Process in 
            compliance with cGMPs, if applicable, which actual cost shall be 
            comprised of the cost of goods produced as determined in 
            accordance with United States generally accepted accounting

                                      -2-


<PAGE>


            principles, and shall include direct labor, direct material and 
            allocable manufacturing overhead but shall exclude selling, 
            general and administrative, research and development and interest 
            expenses; Fully-Burdened Manufacturing Cost shall include, to the 
            extent applicable, the cost to CBC of having some portion or all 
            of the Manufacturing Process performed by a third party.

                                      [***]


      1.15  "KNOWHOW" means materials, data, results, formulae, designs, 
            specifications, methods, processes, improvements, techniques, 
            ideas, discoveries, technical information, process information, 
            clinical information and any other information, whether or not 
            any of the foregoing is patentable, known to and which is 
            confidential (in accordance with Section 9.1 hereof) and 
            proprietary to CBC now or hereafter during the Term, to the extent 
            that any of the foregoing relates to any Licensed Patent Rights or 
            the development, manufacture, use or sale of Adjuvant in connection
            with the development, manufacture, use or sale of any Licensed
            Product; provided however, that the term "Knowhow" shall not include
            any of the foregoing that is subject to proprietary rights of third 
            parties.

      1.16  "LICENSED PATENT RIGHTS" means any and all patent applications
            and patents (including inventor's certificates and utility models) 
            throughout the world, including any substitutions, extensions, 
            reissues, reexaminations, renewals, divisions, continuations and 
            continuation-in-parts of the foregoing, which CBC now or hereafter
            during the Term owns or controls (solely or jointly) or under which
            CBC has the fight to grant sublicenses (regardless of any royalty or
            other payments to a third party required of CBC), to the extent that
            any of the foregoing covers, in whole or in part, the development, 
            manufacture, use or sale of Adjuvant in connection with the 
            development, manufacture, use or sale of any Licensed Product.
            "Licensed Patent Rights" shall include, without limitation, 
            the patent listed on Exhibit "A" attached and incorporated into 
            this Agreement.

      1.17  "LICENSED PRODUCT" means any vaccine or vaccines formulated using 
            Licensed Patent Rights or Knowhow in the Field of Use.




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      1.18  "LICENSED TERRITORY" means the world.

      1.19  "MANUFACTURE" OR "MANUFACTURING PROCESS" means the aseptic 
            storage, handling, production, processing and packaging of 
            Adjuvant in accordance with this Agreement.

                                      [***]

      1.21  "OPTION" is defined in Section 3.2.

      1.22  "PARTY" AND "PARTIES" are defined in the introductory paragraph.

      1.23  "PLA-ENABLING HUMAN CLINICAL TRIAL" means as to a specific 
            Licensed Product, a controlled and lawful study of the efficacy 
            of such Licensed Product by administration of such Licensed 
            Product to human beings where the principal purpose of such trial 
            is to provide statistically significant efficacy data to serve as 
            pivotal support for an application to the United States Food 
            and Drug Administration for approval of a Licensed Product for the 
            indication being investigated by the trial.

      1.24  "PROGENICS" means Progenics Pharmaceuticals, Inc., a Delaware 
            corporation, its Affiliates and its permitted successors and 
            assigns.

      1.25  "PROGENICS SHARES" is defined in Section 3.2.

      1.26  "SPECIFICATIONS" is defined in Section 8.3(a).

      1.27  "TERM" is defined in Section 10.1.

      1.28  "VALID CLAIM" means a claim in an issued, unexpired patent in the 
            Licensed Patent Rights, which has not been held invalid, 
            unpatentable or unenforceable in an unappealed or unappealable 
            decision of a court or other governmental body of




                                      -4-

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<PAGE>


            competent jurisdiction, which has not been rendered unenforceable 
            through disclaimer or otherwise, and which has not been lost 
            through an interference proceeding.


2.    LICENSE.

      2.1   GRANT OF LICENSE RIGHTS. CBC hereby grants to Progenics a 
            worldwide license that is exclusive as to all parties [***],
            to use the Knowhow and practice the Licensed Patent Rights 
            to develop, manufacture, have manufactured, use, sell, and 
            have sold Licensed Products.

      2.2   SUBLICENSES. Progenies shall have the right to grant sublicenses 
            of its rights under this Agreement with respect to Licensed 
            Products (but not the Adjuvant alone) (a "Sublicense") only as 
            follows:

                                      [***]

            (c)    Progenies shall promptly notify CBC of the execution of 
                   each sublicensee and shall provide CBC with a copy of same.

      2.3   ON-GOING TRANSFER OF KNOWHOW AND LICENSED PATENT RIGHTS. 
            CBC shall promptly transfer to Progenics existing Knowhow 
            and Licensed Patent Rights for purposes of Progenics' 
            research and development (including but not limited to 
            pre-clinical trials and human clinical trials but excluding 
            Knowhow relating to the Manufacture of the Adjuvant) with 
            respect to Licensed Products. On an on-going basis during 
            the Term, CBC shall identify and disclose to Progenics in 
            writing any and all Knowhow (exclusive of Knowhow relating 
            to the Manufacturing the Adjuvant) then existent, whether or 
            not potentially patentable, and any and all Licensed Patent Rights 
            then existent.

3.    SCHEDULE OF PAYMENTS TO CBC.

                                      [***]



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<PAGE>


                                      [***]





      3.2   RESTRICTED SHARES. As additional consideration for the rights 
            granted hereunder, Progenies shall issue to CBC simultaneously 
            with the execution of this agreement sixty thousand (60,000) 
            shares of Progenies' common stock (the "Progenies Shares). Each 
            of the Progenies Shares shall be subject to the restriction (the 
            "Transfer Restriction") that no holder of such share shall sell, 
            assign or transfer (collectively a "Transfer") a Progenies Share 
            during the period of time that the Transfer Restriction is in force
            and effect as to such share. Upon the occurrence of certain 
            milestone events, as set forth below, the Transfer Restriction 
            shall lapse as to the number of Progenies Shares which remain 
            restricted set forth opposite the respective milestone.

            MILESTONE                            NUMBER OF PROGENICS SHARES AS
                                                 TO WHICH RESTRICTION LAPSES



                                      [***]



            Progenies shall promptly give CBC notice of the occurrence of 
            each milestone.  Notwithstanding the foregoing, a holder of 
            Progenies Shares may Transfer all (but not less than all) of the 
            Progenies Shares which are subject to the Transfer Restriction to 
            a transferee of all or substantially all of the business division to



                                      -6-

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<PAGE>


            which this license pertains or to such holder's legal successor 
            upon a merger, reorganization, consolidation, dissolution or 
            liquidation of such holder. In the event that the license 
            hereunder shall terminate pursuant to the provisions of either 
            Section 5.1 or Section 10, then CBC (or its permitted transferee or
            successor pursuant to the next preceeding sentence) shall reconvey 
            to Progenics all of the Progenics Shares which on the effective date
            of such termination remain subject to the Transfer Restriction.

      3.3   ROYALTIES. Subject to the other terms of this agreement, 
            Progenics shall pay to CBC royalties as follows:

            (a)    [***] by Progenics of any Licensed Product 
                   covered by a Valid Claim of Licensed Patent Rights, 
                   payable on a country-by-country basis until the expiration 
                   of the last-to-expire of the Valid Claims covering a
                   Licensed Product in the country of manufacture or sale. 
                   [***]

            (b)    In the event that Progenics should enter into a 
                   Sublicense, CBC will receive [***]

            (c)    If Licensed Patent Rights existing in a given country are 
                   not sufficient to afford a given Licensed Product 
                   sufficient protection from competition by a vaccine in the 
                   Field of Use manufactured by a third party using an adjuvant
                   based on Quillaja Saponaria and such third party holds 
                   at least one-third of the market for such vaccine in the 
                   Field of Use in such country, then the royalty rate payable 
                   by Progenies to CBC will be [***]

            (d)    In any country in which there are no Licensed Patent 
                   Rights, Progenics shall pay to CBC a royalty equal to [***]


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4.    ROYALTY PAYMENTS, REPORTS AND RECORDS.

      4.1   COMMERCIAL INTRODUCTION. Progenies shall promptly give CBC notice 
            of the occurrence of Commercial Introduction of each Licensed 
            Product.

      4.2   ROYALTY PAYMENTS.

            (a)    PAYMENTS; DEDUCTION OF TAXES. After the date of Commercial 
                   Introduction of the first Licensed Product, royalties 
                   under this Agreement on Net Sales of any Licensed Product 
                   for a given calendar quarter will be due and payable from 
                   Progenies to CBC within thirty (30) days after the end of 
                   such calendar quarter. Royalties due under Section 3.3(b) 
                   attributable to sublicense fees shall be payable at the end
                   of the quarter when such license fees are payable. Progenies
                   will remit any such royalty payment due to CBC under this 
                   Agreement by check payable to CBC. Any tax paid or required 
                   to be withheld by Progenies on account of royalties 
                   payable to CBC under this Agreement shall be deducted from 
                   the amount of royalties otherwise due. Progenies shall make 
                   any applicable withholding payments due on behalf of CBC 
                   and shall promptly provide CBC with written documentation 
                   of any such taxes withheld and paid by Progenies or its 
                   sublicensees for the benefit of CBC.

            (b)    FOREIGN CURRENCY CONVERSION. For sales of any Licensed 
                   Product that occur in a currency other than United States 
                   dollars ("foreign currency sales"), the quarterly royalty 
                   payment will be calculated as follows:

                   (A/B) X C = United States dollars royalty payment on 
                   foreign currency sales, where

                   A = foreign currency "Net Sales" per quarter

                   B = foreign exchange conversion rate, expressed in local 
                   currency per United States dollar (using as the applicable 
                   foreign exchange conversion rate the average of the rate 
                   published in the Wall Street Journal or any other mutually 
                   agreed-upon source for the last business day of each of the 
                   three (3) months of the quarter); and

                   C = the royalty rate applicable to such Net Sales under 
                   Section 3.2.

      4.3   ROYALTY REPORTS. After the date of Commercial Introduction of the 
            first Licensed Product Progenies shall render to CBC, together 
            with the royalty payment due under Section 4.2 for a given 
            calendar quarter, a written account for such calendar


                                      -8-


<PAGE>


            quarter showing (a) total gross sales and Net Sales of Licensed 
            Products sold by Progenics and its sublicensees, and the total 
            gross royalty and license fee revenues paid to Progenies by any 
            sublicensee(s) during such calendar quarter, and (b) a calculation 
            of the royalty rate and royalties payable under Section 3.3 
            (including, in the case of foreign currency sales, the total 
            foreign currency Net Sales during such calendar quarter, the 
            applicable foreign exchange conversion rate(s) and the total 
            United States dollar royalty payment amount).

      4.4   PROGENICS' RECORDKEEPING AND INSPECTION. After the date of 
            Commercial Introduction of the first Licensed Product, Progenics 
            shall keep for at least three (3) years records of all sales of 
            Licensed Products in sufficient detail to permit CBC to confirm 
            the accuracy of Progenics' royalty calculations. At the request of 
            CBC no more frequently than once per year, upon at least five (5) 
            business days' prior written notice to Progenics from CBC, and at 
            the expense of CBC (except as otherwise provided below), Progenics 
            shall permit a nationally recognized, independent, certified 
            public accountant selected by CBC and acceptable to Progenics to 
            inspect, during regular business hours, any such Progenics records 
            for the then-preceding three (3) years solely to the extent 
            necessary to verify such calculations, provided that such accountant
            in advance has entered into a confidentiality agreement with 
            Progenics (substantially similar to the confidentiality provisions 
            of this Agreement) limiting the disclosure of such information to 
            authorized representatives of the Parties. Results of any such 
            inspection shall be made available to both Parties. If such 
            inspection reveals a deficiency in the calculation of royalties 
            resulting in an underpaymeat to CBC by five percent (5%) or more, 
            Progenics shall pay all costs and expenses of such inspection.

5.    DUE DILIGENCE.

      5.1   Maintenance of License. In order to maintain the license granted 
            pursuant to Section 2.1 with respect to a designated Licensed 
            Product, Progenics agrees to use its best efforts to:

                                      [***]



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                                      [***]



            If Progenics shall fail to achieve any of the above objectives 
            and such failure shall remain unremedied for a period of sixty 
            (60) days after notice of such failure to Progenics by CBC (the 
            "Grace Period"), this license shall automatically terminate at 
            the end of the Grace Period (except with respect to the first 
            Licensed Product if Progenics has fulfilled the obligations set 
            forth in subparagraphs (a)-(d) of this section 5.1). 
            Notwithstanding the foregoing, if such failure is a result of 
            Progenics not having obtained a third party license necessary 
            to make, use or sell Licensed Products and reasonable evidence is 
            submitted by Progenics to CBC that such license can be obtained in a
            reasonable period of time, Progenics may request that the Grace 
            Period be extended for a period of time set forth in the request.
            CBC shall not unreasonably withhold its consent to such extension 
            but in no event shall the Grace Period exceed one year.  
            CBC shall not unreasonably withhold its consent to any reasonable 
            revision in the preceding schedule requested in writing by Progenics
            and supported by reasonable evidence of technical difficulties or 
            delays in the clinical studies or regulatory process that could have
            not have been reasonably anticipated or avoided, (as for example, 
            should the clinical studies for the first Licensed Product be 
            unsuccessful, the parties shall establish a reasonable schedule 
            for the second Licensed Product). Notwithstanding the foregoing, 
            CBC shall not have the right to terminate the license for failure 
            of Progenics to meet a goal if such failure is a result of.' 
            (i) CBC's failure to meet its obligations hereunder, or (ii) an 
            action brought by a third party claiming that the use of the 
            Adjuvant in Licensed Products infringed a patent of such 
            third party.

      5.2   PRE-CLINICAL AND CLINICAL PROGRAMS. Subject to the other terms of 
            this Agreement (including but not limited to Section 8.7), with 
            respect to all Licensed Products, Progenics or its sublicensees 
            shall be solely responsible for the conduct of pre-clinical and 
            human clinical testing, regulatory filings, applications 
            and approvals, and expenses in connection with all of the foregoing.
            In connection with all of the foregoing:



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            (a)    CBC COOPERATION. CBC shall cooperate with and assist 
                   Progenies in the preparation and filing of information 
                   with respect to the Adjuvant for use in any Investigational 
                   New Drug application, Product License Application or any 
                   other regulatory filings throughout the Licensed Territory 
                   with respect to any Licensed Product. Without limiting the 
                   generality of the foregoing, for purposes of supporting 
                   all pre-clinical and human clinical trials and all 
                   regulatory filings, applications and approvals on the part 
                   of Progenics with respect to any Licensed Product, 
                   CBC hereby agrees that on an on-going basis during the Term: 
                   (i) CBC shall permit Progenics and its sublicensees to 
                   reference CBCs drug master file for the Adjuvant with 
                   the United States Food and Drug Administration; (ii) to the 
                   extent not subject to the proprietary rights of third 
                   parties, CBC shall provide Progenics with all pre-clinical 
                   and clinical data, results and other relevant information 
                   with respect to the Adjuvant (including but not limited to 
                   information regarding the toxicity, safety and stability of 
                   the Adjuvant) that is (A) submitted by CBC in connection with
                   any Investigational New Drug application or other regulatory 
                   filing with respect to the Adjuvant from time to time during 
                   the Term or (B) otherwise in CBC's possession from time to 
                   time during the Term; and (iii) a CBC representative, 
                   at Progenics' request, shall attend periodic meetings to 
                   discuss the progress of clinical trials of any Licensed 
                   Products. Progenies will reimburse CBC for the foregoing 
                   assistance only (i) for its reasonable out-of-pocket 
                   expenses, including but not limited to travel, and (ii) 
                   CBC's fully burdened costs of performing technical studies
                   or engaging outside services subject to the prior approval 
                   of Progenies.

            (b)    ADVERSE EVENTS REPORTING. On an on-going basis during the 
                   Term and for at least ten (10) years after the expiration 
                   or termination of this Agreement, each Party agrees to 
                   provide the other Party with any written information in 
                   its possession which indicates adverse effects in humans  
                   associated with the Adjuvant or any products using the 
                   Adjuvant (including but not limited to Licensed Products).

            (c)    PROGENICS' ERGULATORY REPORTS. Within thirty (30) days of 
                   the Effective Date and on an annual basis thereafter 
                   (commencing with the first anniversary of the Effective 
                   Date), Progenics will provide CBC with (i) a written report 
                   summarizing the regulatory filings, applications and  
                   approvals with respect to any Licensed Product that Progenics
                   or its sublicensees (a) have made, sought or obtained in the 
                   prior twelve (12)-month period, and (b) reasonably expect 
                   to make, seek or attempt to obtain in the ensuing twelve  
                   (12)- month period following the date of the report,and 
                   (ii) results of clinical trials conducted by Progenics 
                   using QS-21. Any


                                      -11-

<PAGE>

                   and all such reports shall be considered confidential and 
                   proprietary information of Progenics in accordance with 
                   Section 9, provided, however, that CBC may share relevant 
                   safety data with its other QS-21 licensees in a manner 
                   intended not to disclose any other proprietary information of
                   Progenics.

6.    REPRESENTATIONS AND WARRANTIES OF PROGENICS; REGISTRATION RIGHTS.

      6.1   Progenics represent and warrants to CBC as follows:

            (a)    ORGANIZATION, STANDING AND AUTHORITY. Progenics is a 
                   corporation duly organized, validly existing and in good 
                   standing under the laws of the state of Delaware. 
                   Progenics has all requisite corporate power to own and 
                   operate its properties and assets and to carry on its 
                   business as presently being conducted and as proposed to be
                   conducted. Progenics has, and will have on all relevant 
                   dates, all requisite legal and corporate power to execute 
                   and deliver this Agreement, to issue the Progenics Shares, 
                   and to carry out and perform its obligations under the terms 
                   of this Agreement.

                   The execution and delivery of this Agreement and the 
                   performance of the transactions contemplated hereby have 
                   been duly authorized by all appropriate Progenics 
                   corporate action. The performance by Progenics of any of 
                   the terms and conditions of this Agreement on its part to be
                   performed does not and will not constitute a breach or 
                   violation of any other agreement or understanding, written 
                   or oral, to which it is a party.

            (b)    CAPITALIZATION. The authorized capital stock of Progenics 
                   at December 31, 1994 consisted of: (i) 40,000,000 common 
                   shares, par value of $.001 per share, of which 12,000,000 
                   shares have been designated Common Stock, of which 
                   2,999,550 shares are issued and outstanding and 5,000,000 
                   shares have been designated Class A Common Stock, of which 
                   no shares are issued and outstanding; and (ii) 20,000,000 
                   preferred shares, par value $.001 per share, of which 
                   4,000,000 shares have been designated Series A Preferred 
                   Stock, of which 2,308,000 shares are issued and outstanding 
                   and 2,500,000 shares have been designated Series B 
                   Preferred Stock, of which 1,982,830 shares are issued and 
                   outstanding. Progenics has reserved 2,348,313 shares of 
                   Progenies Common stock for stock options outstanding at 
                   December 31, 1994. Progenics has reserved 150,000 shares
                   of Progenics Common Stock for a warrant outstanding 
                   at December 31, 1994.


                                      -12-

<PAGE>

                   Except as set forth above, there are (i) no share
                   of capital stock or other voting securities of Progenics 
                   authorized or outstanding, (ii) no subscriptions, options,
                   conversation or exchange rights, warrants, repurchase or 
                   redemption agreements or other agreements, claims or 
                   commitments of any nature whatsoever obligating Progenies to
                   issue, transfer, deliver or sell, repurchase or redeem or 
                   cause to be issued, transferred, delivered, sold, 
                   repurchased or redeemed, additional shares of its capital 
                   stock or other securities or obligating Progenics to grant, 
                   extend or enter into any such agreement or commitment: (iii)
                   no voting trusts or other agreements or understandings with 
                   respect to the voting of the capital stock of Progenics or 
                   agreements or understandings, restrictions on disposition of 
                   the capital stock of Progenics to which Progenics is a party 
                   or is bound or, to the actual knowledge of Progenics, to 
                   which any other party is bound; and (iv) except as set forth 
                   herein, no agreements granting any registration fights 
                   including "piggy-back" fights to any person or entity. All 
                   issued and outstanding shares of common stock have been duly 
                   authorized and validly issued and are fully paid and 
                   nonassessable.

            (c)    FINANCIAL STATEMENTS. Progenics has delivered to CBC copies 
                   of the following financial statements:

                   (i)    Progenics' audited balance sheet at December 31, 1994,
                          and its audited statements of operations, 
                          stockholders' equity and cash flows for the year then
                          ended certified by Coopers & Lybrand LLP. 6.2 
                          Registration Rights.

            (a)    INCIDENTAL REGISTRATION. IfProgenics at any time proposes to 
                   file a registration statement under the Securities Act with 
                   respect to an offering for its own account or on behalf of 
                   holders of its securities of any class of equity security 
                   (excluding an initial public offering which does not include
                   securities registered for the account of so-called "selling 
                   shareholders" or a registration relating solely either to the
                   sale of securities to employees of Progenics pursuant to a 
                   stock purchase, stock option or similar plan or a merger, 
                   recapitalization or reorganization), Progenics shall promptly
                   give CBC or any holder of Progenies Shares pursuant to a 
                   transfer permitted under Section 3.2 (collectively a 
                   "Holder") written notice of such registration at least 10 
                   days prior to the anticipated filing date and such notice 
                   shall offer the Holder the opportunity to register such 
                   number of Progenics Shares as the Holder may request. Upon 
                   the written request of Holder given within 10 days after 
                   receipt of such notice delivered by Progenies, Progenics 
                   shall use its best efforts to cause to be registered

                                      -13-

<PAGE>

                   under the Securities Act all of the Progenics Shares that 
                   Holder has requested to be registered.

            (b)    UNDERWRITING REQUIREMENTS. In connection with any offering 
                   involving an underwriting of shares herein issued by 
                   Progenics, Progenics shall not be required under 
                   paragraph 6.2(a) to include any of the Progenics Shares in
                   such underwriting unless Holder accepts the terms of the 
                   underwriting as agreed upon between Progenics and the 
                   underwriters selected by it, and then only in such quantity 
                   as will not, in the written opinion of the underwriters, 
                   jeopardize the success of the offering by Progenics. In 
                   connection with any offering pursuant to paragraph 6.2(a). 
                   if the total amount of shares requested by Holder to be 
                   included in such offering exceeds the amount of securities 
                   sold other than by Progenics that the underwriters reasonably
                   believe is compatible with the success of the offering, then 
                   Progenics shall be required to include in the offering only
                   that number of shares that the underwriters believe will not 
                   jeopardize the success of the offering, (the shares so 
                   included to be apportioned pro rata among all stockholders 
                   of Progenics selling in the offering according to the total 
                   amount of shares owned by each such stockholder or in such 
                   other proportions as shall be agreed upon by such 
                   stockholders).

            (c)    EXPENSES OF REGISTRATION. Progenics shall bear and pay all 
                   expenses incurred in connection with any registration, filing
                   or qualification of shares with respect to registrations 
                   pursuant to this paragraph 6.2 for Holder, including, without
                   limitation, all registration, filing, qualification, printing
                   and accounting fees relating or apportionable thereto, but 
                   excluding underwriting discounts and commissions relating to
                   shares being registered, applicable transfer taxes and 
                   expenses of counsel to any of the Holders, which shall be 
                   borne by the stockholders selling shares being registered.

            (d)    PROGENICS WITHDRAWAL OF REGISTRATION. Progenics shall have 
                   no liability to Holder for Progenics' withdrawal of any 
                   registration as to which Holder has registration rights 
                   under the paragraph 6.2 provided such withdrawal is made 
                   in good faith by Progenies and not for the purpose of 
                   impairing any of Holder's rights under this paragraph 6.2.

            (e)    OBLIGATIONS OF PROGENICS. Whenever required under this 
                   paragraph 6.2 to effect the registration of any shares, 
                   Progenies shall, as expeditiously as reasonably possible:

                                      -14-

<PAGE>

                   (i)    prepare and file with the SEC a registration statement
                          with respect to such shares and use its best efforts 
                          to cause such registration statement to become 
                          effective;

                   (ii)   prepare and file with the SEC such amendments and 
                          supplements to such registration statement and the 
                          prospectus used in connection therewith as may be 
                          necessary to comply with the provisions of the
                          Securities Act with respect to the disposition of all
                          securities covered by such registration statement;

                   (iii)  furnish to Holder such number of copies of a 
                          prospectus, including a preliminary prospectus, 
                          in conformity with the requirement of the Securities 
                          Act and such other documents as they may reasonably
                          request in order to facilitate the disposition of the
                          shares owned by them and covered by a registration 
                          statement flied under this paragraph 6.2;

                   (iv)   use its best efforts to register and qualify the 
                          securities covered by such registration statement 
                          under such other securities or Blue Sky laws of such
                          jurisdiction as shall be reasonably requested by 
                          Holder, provided that Progenics shall not be required
                          in connection therewith or as a condition thereto to 
                          qualify to do business or to file a general consent 
                          to service of process in any such states or 
                          jurisdictions;

                   (v)    in the event of any underwritten public offering, 
                          enter into and perform its Obligations under an 
                          underwriting agreement, in usual and customary form,
                          with the underwriter(s) of such offering who shall be
                          chosen by Progenics (and Holder shall also enter into
                          and perform its obligations under such an underwriting
                          agreement); and

                   (vi)   notify Holder as promptly as possible at any time when
                          a prospectus relating thereto is required to be 
                          delivered under the Securities Act of the happening 
                          of any event as a result of which the prospectus 
                          included in such registration statement, as then in 
                          effect, includes an untrue statement of a material 
                          fact or omits to state a material fact required to be
                          stated therein or necessary to make the statements 
                          therein, in light of the circumstances under which 
                          they were made, not misleading.

            (f)    OBLIGATIONS OF HOLDER. In connection with any registration 
                   required to be effected pursuant to this paragraph 6.2, 
                   Holder shall furnish to Progenies

                                      -15-

<PAGE>

                   such information regarding itself, the shares held by it and 
                   the intended method of disposition of such securities as 
                   shall be required to effect the registration of their shares.

            (g)    LOCK-UP AGREEMENT. CBC hereby agrees that in connection with 
                   any registration of equity securities relating to an 
                   underwritten offering thereof to the general public, CBC 
                   shall not, whether or not CBC is participating in such 
                   registration, to the extent requested by Progenies or the 
                   underwriter of such offering, sell or otherwise transfer or 
                   dispose of (other than to donors who agree to be similarly 
                   bound) any Progenies Shares (other than those shares which 
                   are in fact included, in such registration) without the prior
                   written consent of Progenics or such underwriters. as the 
                   case may be, for such period of time (not to exceed 120 days)
                   from the effective date of the registration statement for 
                   such registration as Progenies or such underwriters may 
                   specify in writing.

            (h)    INDEMNIFICATION. Progenies may require, as a condition to 
                   including any Progenies Shares in any registration statement 
                   filed pursuant to this paragraph 6.2, that Progenics shall 
                   have received an undertaking satisfactory to it from (i) the
                   prospective seller of such securities, to indemnify and hold
                   harmless Progenics, each officer and director of each such 
                   underwriter and each other person, if any, who controls 
                   Progenies or the underwriter, and (ii) each such underwriter
                   of such securities, to indemnify and hold harmless Progenics,
                   each officer and director of Progenics, each prospective 
                   seller, each officer and director or each prospective seller
                   and each other person, if any, who controls Progenies or
                   any such prospective seller within the meaning of Section 15 
                   of the Securities Act or Section 20 of the Exchange Act, 
                   with respect to any statement in or omission from such 
                   registration statement, any preliminary prospectus, final 
                   prospectus or summary prospectus included therein, or any 
                   amendment or supplement thereto, if such statement or 
                   omission was made in reliance upon and in conformity with 
                   written information furnished by such prospective seller 
                   or underwriter, as the ease may be, to Progenics for use in 
                   the preparation of such registration statement, preliminary
                   prospectus, final prospectus, summary prospectus, amendment 
                   or supplement. Such indemnity shall remain in full force and
                   effect regardless of any investigation made by or on behalf 
                   of Progenics or any such director, officer or controlling 
                   person and shall survive the transfer of such securities by 
                   such seller.

                                      -16-

<PAGE>

7.    CBC REPRESENTATIONS AND WARRANTIES.

      7.1   CBC represents and warrants to Progenies as follows:

            (a)    ORGANIZATION, STANDING AND AUTHORITY. CBC is a corporation 
                   duly organized, validly existing and in good standing under 
                   the laws of the state of Delaware. CBC has all requisite 
                   corporate power to own and operate its properties and assets 
                   and to carry on its business as presently being conducted 
                   and as proposed to be conducted. CBC has, and will have on 
                   all relevant dates, all requisite legal and corporate power 
                   to execute and deliver this Agreement.

                   The execution and delivery of this Agreement and the 
                   performance of the transactions contemplated hereby have 
                   been duly authorized by all appropriate CBC corporate action.
                   The performance by CBC of any of the terms and conditions of
                   this Agreement on its part to be performed does not and will 
                   not constitute a breach or violation of any other agreement 
                   or understanding, written or oral, to which it is a party. 
                   CBC has the full right and legal capacity to provide in the 
                   Licensed Territory all rights to the Knowhow and Licensed 
                   Patent Rights granted to Progenics hereunder.

            (b)    PROCEEDINGS OR CLAIMS. There are no adverse proceedings, 
                   claims or actions pending, or to the best of CBC's knowledge,
                   threatened, relating to the Knowhow and/or Licensed Patent 
                   Rights and at the time of disclosure and delivery thereof to 
                   Progenies, CBC shall have the full right and legal capacity 
                   to disclose and deliver the Knowhow and Licensed Patent 
                   Rights to Progenics without violating the fights of third 
                   parties.

            (c)    INVESTMENT. CBC is acquiring the Progenics Shares for 
                   investment and not with a view to the distribution thereof 
                   nor with any present intention of distributing or selling any
                   Progenics Shares except in compliance with the Securities 
                   Act.

8.    MANUFACTURE AND SUPPLY.

      8.1   GENERAL. The terms of the exclusive license granted to Progenics 
            under Section 2 notwithstanding, Progenics agrees that CBC 
            retains the right to Manufacture the Adjuvant for use in Licensed 
            Products. CBC agrees to supply Progenies with one hundred percent 
            (100%) of its Adjuvant Requirements for purposes of research and 
            development, pre-clinical and human clinical trials and 
            commercial sales of all Licensed Products. CBC also agrees to 
            supply each of Progenics sublicensees with all of its Adjuvant 
            Requirements provided such sublicensee enters a supply

                                      -17-

<PAGE>

            agreement with CBC containing substantially the same terms 
            pertaining to supplyas set forth herein. CBC hereby agrees, at 
            its sole expense, to commit allreasonably necessary facilities, 
            appropriately trained personnel, machinery, equipment, utilities 
            and other CBC resources required to satisfy its obligations under 
            this Agreement. CBC may contract with a third party to fulfill 
            its obligations hereunder and/or may assign or sublicense all or 
            any portion of its rights and obligations under this Section 8 
            with respect to Manufacture and supply of Adjuvant Requirements. 
            For all purposes under this Section 8, the term CBC,.shall be 
            deemed to include any such third party, assignee or sublicensee 
            of CBC.

      8.2   CBC TRANSFER PRICE OF ADJUVANT.

            (a)    THROUGH FILING OF PRODUCT LICENSE APPLICATION. With respect 
                   to each and every Licensed Product, CBC shall supply one 
                   hundred percent (100%) of Adjuvant Requirements prior to 
                   Commercial Introduction of such Licensed Product, including 
                   for purposes of all research and development, pre-clinical 
                   trials and human clinical trials (including PLA-Enabling 
                   Human Clinical Trials) of such Licensed Product. CBC agrees 
                   to supply Adjuvant under this Section 8.2(a) at a transfer 
                   price to Progenics [***]. In order to verify the production
                   cost of the Adjuvant, Progenics will have the right to pay 
                   for an independent certified public accountant to inspect the
                   records of CBC once per year during regular business hours,
                   provided that such accountant has entered into a 
                   confidentiality agreement with CBC limiting the disclosure 
                   of such information to authorized representatives of the 
                   Parties.

            (b)    COMMERCIAL INTRODUCTION AND SALES. With respect to each and 
                   every Licensed Product, CBC shall supply [***] of Adjuvant 
                   Requirements for commercial sales of suchLicensed Product 
                   upon and after its Commercial Introduction. CBC agrees to 
                   supply Adjuvant under this Section 8.2(b) at a transfer 
                   price [***].

      8.3   CBC'S REPRESENTATIONS, WARRANTIES AND COVENANTS REGARDING 
            MANUFACTURING. CBC hereby represents and warrants to Progenics 
            and its sublicensees as follows:

            (a)    PRE-CLINICAL TRIAL USE. CBC shall Manufacture or cause to be
                   Manufactured all Adjuvant Requirements for use in any vaccine
                   used in


                                      -18-

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<PAGE>

                   connection with any pre-clinical trial of any Licensed 
                   Product (i) strictly in compliance with (A) this Agreement,
                   (B) the specifications for the Manufacture of Adjuvant, as 
                   may from time to time be required by the Food and Drug 
                   Administration (the "Specifications") the current version of
                   which is set forth in Exhibit B, and (C) all applicable laws 
                   and regulations.

            (b)    HUMAN CLINICAL TRIAL USE. CBC shall Manufacture or cause to 
                   be Manufactured all Adjuvant Requirements for use in any 
                   vaccine used in connection with any human clinical trial of 
                   any Licensed Product (i) strictly in compliance with (A) this
                   Agreement, (B) all Specifications, and (C) all applicable 
                   laws and regulations, including but not. limited to cGMPs, 
                   to the extent applicable. Notwithstanding the foregoing, the
                   parties acknowledge and agree that the Adjuvant which is 
                   being delivered to Progenics in the first lot (approximately
                   one gram) has been manufactured by CBC for use in Phase 1 
                   and Phase 2 clinical trials in a manner which CBC believes 
                   to be appropriate for such level of clinical trial. It shall
                   be the responsibility of Progenics to obtain such assurances
                   from regulatory authorities as it may deem necessary or 
                   appropriate for the use of such Adjuvant in the trials it is
                   planning to conduct.

            (c)    COMMERCIAL USE. CBC shall Manufacture or cause to be 
                   Manufactured all Adjuvant Requirements for use in the 
                   commercialization of any Licensed Product (i) strictly in 
                   compliance with (A) this Agreement, (B) all Specifications, 
                   and (C) all applicable laws and regulations, including but
                   not limited to cGMPs, to the extent applicable.

            (d)    CERTIFICATE OF ANALYSIS; NON-COMPLYING ADJUVANT. Before, 
                   during and after Manufacture of Adjuvant Requirements, CBC
                   shall obtain samples, monitor the Manufacturing Process and
                   the environment of such Manufacture, and keep such technical 
                   books and records of all of the foregoing as are required 
                   under the Specifications and all applicable laws and 
                   regulations, including but not limited to cGLPs or cGMPs (as
                   appropriate and applicable). CBC shall test each lot of 
                   Adjuvant Requirements Manufactured for Progenics as required
                   under the Specifications. Together with each such lot of 
                   Adjuvant Requirements, CBC shall provide a written 
                   certificate of analysis which shall set forth the results of
                   such testing by CBC and CBC's quality control approval of 
                   such lot of Adjuvant Requirements. CBC's obligations under 
                   this Section 8.3(d) shall be at CBC's sole expense. Progenies
                   shall be entitled to test any such Adjuvant Requirements in 
                   accordance with the Specifications, at Progenics' sole 
                   expense. Without limiting any of Progenics' other rights 
                   or remedies under this Agreement, with respect to any 
                   Adjuvant Requirements supplied

                                      -19-

<PAGE>

                   hereunder that do not comply with applicable 
                   representations and warranties under this Section 8.3, the 
                   Parties agree that: (i) neither Progenies nor its 
                   sublicensees shall be obligated to pay CBC the transfer 
                   price applicable to such non-complying Adjuvant 
                   Requirements; (ii) if Progenies or its sublicensee has 
                   already paid for such non-complying Adjuvant Requirements, 
                   Progenies or its sublicensee shall be entitled to a credit 
                   against future purchases for the amount paid to CBC 
                   therefor; (iii) CBC on a priority basis shall Manufacture 
                   and supply to Progenics or its sublicensee, as applicable, 
                   replacement Adjuvant Requirements in full compliance with 
                   this Section 8.3; and (iv) CBC shall bear the full cost of 
                   returning or destroying the non-complying Adjuvant 
                   Requirements. Progenies shall be deemed to have accepted 
                   any Adjuvant provided hereunder and such Adjuvant shall be 
                   deemed to comply with the provisions hereof unless 
                   Progenies shall notify CBC of the rejection of such 
                   Adjuvant and the reasons for such rejection within the 
                   forty-five days (45) of delivery of such Adjuvant.

8.4   PROCEDURES FOR ESTIMATING, ORDERING AND SUPPLYING ADJUVANT REQUIREMENTS.
      Subject to the other terms of this Agreement:

            (a)    ANNUAL DEMAND FORECAST FOR EACH MANUFACTURING YEAR. During 
                   the Term, commencing on October 1, 1995 and on an on-going 
                   quarterly basis as described below, Progenics will provide 
                   CBC with a written rolling annual demand forecast of Adjuvant
                   Requirements for each calendar year which shall be binding as
                   to the first quarter and non-binding as to the remaining
                   three (3) quarters. Thereafter, Progenics shall provide an 
                   updated annual demand forecast on a quarterly basis no later
                   than ninety (90) days in advance of the commencement of the 
                   first (and binding) quarter covered by such annual demand 
                   forecast. The Parties also agree that the variance, if any,
                   between the binding forecast of a given quarter and the last 
                   non-binding forecast for such quarter shall be between 
                   [***] and [***], meaning that Progenies' binding forecast for
                   such quarter must be at least [***] but not more than [***] 
                   of such last non-binding forecasted amount for such quarter.

            (b)    PURCHASE ORDERS. Except as set forth in Section 8.4(a), 
                   Progenics shall place a firm purchase order or purchase 
                   orders with CBC setting forth (i) the quantities of Adjuvant
                   Requirement to be Manufactured and supplied hereunder, (ii) 
                   the schedule for receipt from CBC of such batch(es) of 
                   Adjuvant Requirements, and (iii) instructions for shipping 
                   and packaging. Each such firm purchase order shall be 
                   submitted no later than thirty (30)


                                      -20-

*** Confidential Treatment Requested

<PAGE>

                   days in advance of the first scheduled date of receipt 
                   thereof. Subject to the other terms of this Agreement, 
                   Progenics shall be obligated to place firm purchase orders 
                   with CBC for, and CBC hereby commits to Manufacture and 
                   supply hereunder pursuant to such firm purchase orders, no 
                   less than one hundred percent (100%) of the amount of 
                   Adjuvant Requirements in the then-binding quarter of each
                   annual demand forecast under Section 8.4(b); provided, 
                   however, that: (A) the Parties may mutually agree in writing
                   to amend any such firm purchase order; (B) CBC, in its 
                   discretion, may agree to supply additional amounts of 
                   Adjuvant Requirements in excess of the then-binding amount,
                   provided that Progenies place firm purchase order(s) for such
                   excess Adjuvant Requirements on a timely basis; and (C) CBC 
                   agrees to provide Progenics with as much advance written 
                   notice as possible (and in any case at least thirty (30) 
                   days' written advance notice) ifCBC determines that any
                   scheduled delivery of Adjuvant Requirements pursuant to any 
                   purchase order will be delayed for any reason of which CBC
                   becomes aware.

            (c)                             [***]


*** Confidential Treatment Requested

                                      -21-

<PAGE>

      8.5   ALLOCATION.

            (a)    ALLOCATION AMONG CUSTOMERS. CBC and Progenics hereby 
                   agree and acknowledge that, in the event that CBC is 
                   unable to satisfy in full its obligations under this 
                   Agreement to supply one hundred percent (100%) of Adjuvant 
                   Requirements as well as CBC's obligations to third parties 
                   with respect to supply of Adjuvant, CBC shall allocate 
                   proportionately all available Adjuvant among Progenies and 
                   its sublicensees and such third parties with highest 
                   priority for the supply of Adjuvant given to outstanding 
                   firm purchase orders for comparable delivery time frames.

            (b)    INABILITY TO SUPPLY. In the event CBC shall fail to fill 
                   one hundred percent (100%) of Progenics' allowable finn 
                   purchase orders for two successive calendar quarters (an 
                   "Inability to Supply") then, notwithstanding Section 8.1, 
                   Progenics may either purchase its Adjuvant Requirements 
                   from a third party or manufacture for its own use its 
                   Adjuvant Requirements, in either case only until such time 
                   as CBC shall demonstrate (if such demonstration shall be 
                   made within one (I) year after the end of the second 
                   consecutive quarter of such shortfall) that it is willing 
                   and able to supply Progenics' Adjuvant Requirements 
                   (provided that Progenics shall not be require. d to 
                   purchase additional Adjuvant from CBC until such time as 
                   it has satisfied commitments of reasonable scope and 
                   duration made for purchase or manufacture of Adjuvant 
                   during such period). In the event Progenics elects to 
                   manufacture the Adjuvant, CBC shall transfer to Progenics 
                   all information and Knowhow reasonably necessary to 
                   manufacture the Adjuvant and CBC shall fully cooperate 
                   with regulatory authorities to qualify Progenics as a 
                   manufacturer of the Adjuvant. Progenics' fight to 
                   manufacture under this section shall be its exclusive 
                   remedy for any damages or losses it incurs as a result of 
                   any interruption in the supply of Adjuvant under this 
                   Agreement. Without limiting the generality of the 
                   foregoing, CBC shall not be liable to Progenics for 
                   consequential damages or lost profits.

      8.6   REGULATORY APPROVAL OF MANUFACTURING. CBC shall be responsible, 
            at sole cost and expense, for obtaining all necessary regulatory 
            approvals particular to the Adjuvant for Manufacture and supply 
            of Adjuvant Requirements. Progenics shall advise CBC of any new 
            requirements specified by the United States Food and Drug 
            Administration or the Federal Food, Drug and Cosmetic Act (or the 
            equivalent regulatory authority or law in other countries) with 
            respect to any Licensed Product. At any time when any portion of 
            the Adjuvant Requirements is being Manufactured by CBC for 
            Progenics, Progenics shall have the right to have its personnel 
            observe all phases and areas of such Manufacture and the CBC 
            facility,

                                     -22-


<PAGE>

          and CBC shall not modify in any manner any Specifications without 
          Progenics' prior written consent (which consent shall not be 
          unreasonably withheld).

    8.7  CBC RECORDKEEPING AND INSPECTION.

         (a)   TECHNICAL RECORDS. With respect to any Manufacture and supply of 
               Adjuvant Requirements, CBC shall, at its expense, keep properly 
               completed technical books and records, test data and reports as 
               required under the Specifications and all applicable laws and 
               regulations, including but not limited to cGLPs or cGMPs (as 
               appropriate), and in any case shall maintain such technical 
               information for at least two (2) years from the expiration date 
               of the relevant Licensed Product or longer if required under 
               applicable laws and regulations (including but not limited to 
               cGLPs and cGMPs, as applicable). During regular business hours 
               and upon reasonable advance written request, CBC shall make any 
               such technical information available to Progenics for inspection
               and copying.

          (b)  FINANCIAL RECORDS. During the Term, CBC shall keep for at 
               least three (3) years records of its Fully Burdened 
               Manufacturing Costs, and the calculations thereof in 
               sufficient detail to permit Progenics to confirm the accuracy 
               thereof. At the request of Progenics, and not more frequently 
               than once per year, upon at least five (5) business days' 
               prior written notice, and at the expense of Progenics (except 
               as otherwise provided below), CBC shall permit a nationally 
               recognized, independent, certiffied public accountant selected 
               by Progenics and acceptable to CBC to inspect (during regular 
               business hours) any such CBC records for the then-preceding 
               three (3) years solely to the extent necessary to verify such 
               costs, margins and calculations, provided that such accountant 
               in advance has entered into a confidentiality agreement with 
               CBC and Progenics substantially similar to the confidentiality 
               provisions of this Agreement, limiting the use and disclosure 
               of such information to authorized representatives of the 
               Parties. Results of any such inspection shall be made 
               available to both Parties. If such inspection reveals a 
               deficiency in the calculation of CBC's Fully Burdened 
               Manufacturing Cost resulting in an overpayment to CBC of the 
               transfer price by five percent (5%) or more, CBC shall pay all 
               costs and expenses of such inspection.

          (c)  QUALITY AUDIT. To the extent required by law, CBC shall permit 
               Progenics to audit, in cooperation with CBC's personnel, 
               production, packaging, and quality control facilities of CBC 
               and any of its significant suppliers as they relate to 
               production of the Adjuvant to allow Progenics to verify CBC's 
               compliance with its responsibilities under this Agreement.


                                     -23-

<PAGE>

     8.8 LIABILITY.

          (a)  INDEMNIFICATION BY PROGENIES. Except as otherwise provided in 
               Sections 8.8(b) or (c), Progenics will defend, indemnify and 
               hold harmless CBC against any and all claims, actions, 
               liabilities, damages, loses, costs or expenses, including 
               reasonable attorneys' fees, based upon or arising out of the 
               sales or use of any Licensed Product by Progenics or a 
               sublicensee, unless CBC should fail to give Progenics prompt 
               notice thereof in writing and such failure materially 
               prejudices CBC's abilities to defend against such claim. CBC 
               shall permit Progenics to control the investigation, 
               preparation and defense thereof(including any compromise or 
               settlement thereof and any appeal) and provide reasonable 
               assistance to Progenics, at Progenics' expense, in that regard.

          (b)  LIABILITY. Each Party assumes full responsibility and 
               liability for any injury, damage or expense which it or its 
               employees, agents and invitees incur and which arise from its 
               manufacture, handling and use of the Adjuvant or Licensed 
               Products, except to the extent such injury, damage or expense 
               arises from the negligence or willful misconduct of the other 
               Party.

          (c)  INDEMNIFICATION BY CBC. CBC will defend, indemnify and hold 
               harmless Progenics against any and all claims, actions, 
               liabilities, damages, losses, costs or expense (including 
               reasonable attorneys' fees) based upon the failure of the 
               Adjuvant to conform to the Specifications; of CBC, unless 
               Progenics shall fail to give CBC prompt notice thereof in 
               writing and such failure materially prejudices Progenics' 
               ability to defend against said claim. Progenics shall permit 
               CBC to control the investigation, preparation and defense 
               thereof (including any compromise or settlement thereof and 
               any appeal) and provide reasonable assistance to CBC, at CBC's 
               expense, in that regard.

9.  CONFIDENTIALITY.

     9.1  CONFIDENTIALITY. The Parties acknowledge that during the Term, 
          either Party may receive from the other Party information which is 
          proprietary, confidential and of significant commercial value to 
          the disclosing Party. Except to the extent expressly authorized by 
          this Agreement, the Parties agree that, for the Term and for five 
          (5) years thereafter, the receiving Party shall keep completely 
          confidential and shall not publish or otherwise disclose and shall 
          not use for any purpose (except those related to this agreement) 
          any information furnished to it by the other Party pursuant to this 
          Agreement, except to the extent that it can be


                                     -24-

<PAGE>

          established by the receiving Party by competent proof (including 
          written records) that such information:

          (a)  was already known to the receiving Party, other than under an 
               obligation of confidentiality, 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;

          (d)  was subsequently lawfully disclosed to the receiving Party by 
               a third party; or

          (e)  was subsequently independently developed by receiving Party.

     9.2  PERMITTED DISCLOSURES. Each Party may disclose the other Party's 
          information to the extent such disclosure is reasonably necessary 
          in prosecuting or defending litigation, filing, prosecuting or 
          maintaining patent applications or patents, complying with 
          applicable laws or regulations, or, in the case of Progenics and 
          its sublicensees, conducting preclinical or clinical trials or 
          preparing or filing regulatory filings with respect to Licensed 
          Products; provided, however, that if a Party is required to make 
          any disclosure of the other Party's information furnished pursuant 
          to this Agreement, it will give reasonable advance notice of such 
          disclosure requirements to the other Party and, except to the 
          extent inappropriate as in the case of patent applications, will 
          use its best efforts to secure confidential treatment of such 
          information required to be disclosed.

10. TERM; TERMINATION.

     10.1 TERM. This Agreement shall commence as of the Effective Date and, 
          unless sooner terminated as provided in this Section 10, shall 
          expire on the date royalties are not longer payable by Progenics to 
          CBC under Section 3.3 (the "Term"), upon which expiration Progenics 
          shall thereafter have in perpetuity a royalty-free license in the 
          Licensed Territory to use the Knowhow and practice the Licensed 
          Patent Rights to develop, make, have made, use and sell Licensed 
          Products without any accounting to CBC.

     10.2 MATERIAL BREACH. Subject to Section 13.6, failure by either Party 
          to comply with any of the material obligations contained in this 
          Agreement shall entitle the other

                                     -25-

<PAGE>

          Party to give to the Party in default notice specifying the nature 
          of the default and requiring it to cure such default. If such 
          default is not cured within sixty (60) days after the receipt of 
          such notice, the notifying Party shall be entitled, without 
          prejudice to any of its other rights conferred on it by this 
          Agreement and in addition to any other remedies available to it by 
          law or in equity, to terminate this Agreement effective upon 
          written notice to the other Party. The right of a Party to 
          terminate this Agreement, as hereinabove provided, shall not be 
          affected in any way by its waiver or failure to take action with 
          respect to any previous default.

     10.3 ACCRUED RIGHTS, SURVIVING OBLIGATIONS; SUBLICENSEES. Expiration or 
          any termination of this Agreement for any reason shall be without 
          prejudice to any rights which shall have accrued to the benefit of 
          either Party prior to such expiration or termination. Such 
          expiration or termination shall not relieve either Party from 
          obligations which are expressly indicated to survive expiration or 
          termination of this Agreement, which obligations include, without 
          limitation, those under Sections 4.4, 5,2(b), 7, 8.7, 8.8, 9, 11 
          and 12. [***]

     10.4 TERMINATION BY PROGENICS. Progenics may terminate this Agreement by 
          giving 90 days written notice to CBC: provided Progenics shall be 
          obligated to fulfill its obligations under any binding purchase 
          order outstanding; and further provided that upon such termination 
          all rights to Know-how and Licensed Patent Rights shall revert to 
          CBC.

11.  PATENTS.

     11.1 INVENTIONS. Title to any Licensed Patent Rights will follow 
          inventorship, which will in turn be determined in accordance with 
          United States laws of inventorship and written evidence of the 
          Parties. Designation of inventors on any patent application is a 
          matter of law and will be solely within the discretion of qualified 
          patent counsel of CBC and Progenics.

     11.2 PATENT PROSECUTION STRATEGY. Subject to the other terms of this 
          Agreement:

          (a)  CBC SOLELY OWNED LICENSED PATENT RIGHTS. During the Term, the 
               filing, prosecution and maintenance of Licensed Patent Rights 
               solely owned by CBC will be under the control of CBC, at its 
               sole cost and expense.

          (b)  JOINTLY OWNED LICENSED PATENT RIGHTS. During the Term, the 
               filing, prosecution and maintenance of any Licensed Patent 
               Rights jointly owned


*** Confidential Treatment Requested

                                     -26-

<PAGE>

               by the Parties will be under the control of the Party from 
               whom the majority of the data underlying such Licensed Patent 
               Rights arose (the "controlling Party"), and the controlling 
               Party is authorized to undertake such filings, prosecutions 
               and maintenance at its sole cost and expense, using patent 
               counsel reasonably satisfactory to the non-controlling Party 
               and with the reasonable cooperation of the non-controlling 
               Party and its employees, provided that: (i) the controlling 
               Party notifies the non-controlling Party reasonably prior to 
               the filing of any such Licensed Patent Rights by the 
               controlling Party and permits review of such proposed Licensed 
               Patent Rights by the non-controlling Party; (ii) the 
               controlling Party provides the non-controlling Party promptly 
               with copies of all communications received by the controlling 
               Party; (iii) the controlling Party keeps the non-controlling 
               Party reasonably informed of the status of such Licensed 
               Patent Rights, and (iv) the controlling Party provides the 
               non-controlling Party notice at least thirty (30) days in 
               advance of taking or failing to take any action that would 
               affect the scope or validity of any such Licensed Patent 
               Rights (including but not limited to substantially narrowing 
               or canceling any claim, abandoning any such Licensed Patent 
               Rights or not filing or perfecting the filing of any such 
               Licensed Patent Rights in any country), with prior written 
               notice of such proposed action or inaction so that the 
               non-controlling Party has a reasonable opportunity to review 
               and make comments. Either Party may assign its rights to any 
               jointly owned Licensed Patent Rights to the other Party, who 
               will have the right, in its discretion, to assume the 
               prosecution and maintenance thereof at its sole expense and as 
               the sole owner thereof.

          (c)                          [***]


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                                     -27-

<PAGE>

                                      [***]


     11.3 THIRD PARTY INFRINGEMENT. Either Party promptly shall notify the 
          other Party in writing of any alleged infringement of the Licensed 
          Patent Rights and of any available evidence thereof. The Parties 
          shall consult as to a potential litigation strategy or strategies 
          against any alleged infringer. If the Parties commence and 
          prosecute a suit jointly, they shall share all associated 
          attorneys' fees and out-of-pocket litigation expenses equally. If 
          the Parties do not decide to jointly commence an action within 
          thirty (30) days of the notice specified above, or otherwise 
          terminate the alleged infringement, CBC shall have the right, at 
          its expense, to bring suit against the allegedly infringing party. 
          [***]

     11.4 TRADEMARKS. Progenics, at its expense, shall be responsible for the 
          selection, registration and maintenance of all trademarks and 
          tradenames which it employs in connection with Licensed Products. 
          The terms "trademark" or "tradename" shall include, without 
          limitation, the name or names of any Licensed Products, the design 
          of the packaging of any Licensed Products, and the appearance of 
          dosage forms of any Licensed Product. Progenics shall own such 
          tradenames and trademarks and shall retain such ownership upon 
          termination of this Agreement.

12.  ARBITRATION.

     Any dispute, controversy or claim between the Parties, arising out of or 
     relating to this Agreement or the Parties' respective rights and 
     obligations hereunder either during or after the Term (including the 
     question as to whether any such matter is arbitrable) shall be subject 
     to binding arbitration in accordance with then-existing commercial 
     arbitration rules of the American Arbitration Association. The Parties 
     agree that, in the course of any such


*** Confidential Treatment Requested

                                     -28-

<PAGE>

     arbitration, service of any notice at their respective addresses in 
     accordance with Section 13.11 of this Agreement shall be valid and 
     sufficient, and any arbitration hereunder shall be in the jurisdiction 
     of the defendant Party, which in the case of Progenics shall be New York 
     and in the case of CBC shall be Massachusetts. In any such arbitration, 
     an award shall be rendered by a majority of the members of a board of 
     arbitration consisting of three (3) members, one (1) of whom shall be 
     chosen by each of Progenics and CBC and the third of whom shall be 
     appointed by mutual agreement of such two (2) arbitrators. In the event 
     of failure of such two (2) arbitrators to agree within sixty (60) days 
     after the commencement of arbitration (as defined below) upon 
     appointment of the third arbitrator, or in the event that either Party 
     shall fail to appoint an arbitrator within thirty (30) days after the 
     commencement of the arbitration proceedings, the third arbitrator or 
     (upon request of the other Party) the second arbitrator and the third 
     arbitrator, as the case may be, shall be appointed by the American 
     Arbitration Association in accordance with its then existing commercial 
     arbitration rules. For purposes of this Section, the "commencement of 
     the arbitration proceeding" shall mean the date upon which the 
     defendant Party receives from the American Arbitration Association a 
     copy of the request for arbitration filed by the party desiring to have 
     recourse to arbitration. The decision of the arbitrators shall be in 
     writing and shall set forth the basis therefor. The Parties shall abide 
     by all awards rendered in arbitration proceedings, and such awards may 
     be enforced and executed upon in any court having jurisdiction over the 
     Party against whom enforcement of such award is to be sought. The 
     Parties shall divide equally the administrative charges, arbitrators' 
     fees, and related expenses of arbitration, but each Party shall pay its 
     own legal fees incurred in connection with any such arbitration; 
     provided, however, if the arbitrators determine that one Party prevailed 
     clearly and substantially over the other Party, then the non-prevailing 
     Party shall also pay the reasonable attorneys' fees and expert witness 
     costs and other arbitration costs of the prevailing Party.

13.  MISCELLANEOUS PROVISIONS.

     13.1 NO PARTNERSHIP. Nothing in this Agreement is intended or shall be 
          deemed to constitute a partnership, distributorship, agency, 
          employer-employee or joint venture relationship between the 
          Parties. No Party shall incur any debts or make any commitments for 
          the other, except to the extent, if at all, specifically provided 
          herein.

     13.2 ASSIGNMENTS. Except as set forth in Section 8 hereof, neither Party 
          shall assign any of its right or obligations hereunder or this 
          Agreement, except that either Party may do so: (a) as incident to 
          the merger, consolidation, reorganization or acquisition of stock 
          or assets affecting substantially all of the assets or voting 
          control of such Party; (b) to any wholly-owned subsidiary if such 
          Party remains liable and responsible for the performance and 
          observance of all of the subsidiary's duties and obligations 
          hereunder; (c) with the prior written consent of the other

                                     -29-

<PAGE>

          Party; (d) as incident to a joint venture between Progenics and a 
          major corporate partner; or (e) as incident to any reorganization 
          of CBC; including any reorganization under the provisions of 
          Chapter 11 of the United States Bankruptcy Code and any merger, 
          spin-off, sale of assets or other transaction. This Agreement shall 
          be binding upon the successors and permitted assigns of the Parties 
          and the name of a Party appearing herein shall be deemed to include 
          the names of such Party's successors and permitted assigns to the 
          extent necessary to carry out the intent of this Agreement. Any 
          assignment not in accordance with this Section 13.2 shall be void.

     13.3 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. Without limiting the generality of 
          the foregoing, CBC agrees to provide a letter to FDA authorizing 
          Progenics to cross reference CBC's drug master flies for QS-21.

     13.4 NO NAME OR TRADEMARK RIGHTS. Except as otherwise provided herein, 
          no right, express or implied, is granted by this Agreement to use 
          in any manner the names "Cambridge Biotech Corporation" or 
          "Progenics Pharmaceuticals, Inc." or any contraction thereof or any 
          other trade name or trademark of CBC or Progenics in connection 
          with the performance of this Agreement.

     13.5 PUBLIC ANNOUNCEMENTS. Except as may otherwise be required by 
          applicable law or regulation, neither Party shall make any public 
          announcement concerning this Agreement or the subject matter hereof 
          without the prior written consent of the other Party (not to be 
          unreasonably withheld).

     13.6 FORCE MAJEURE. If any default or delay occurs which prevents or 
          materially impairs a Party's performance and is due to a cause 
          beyond the Party's reasonable control, including but not limited to 
          any act of any god, flood, fire, explosion, earthquake, casualty, 
          accident, war, revolution, civil commotion, blockade or embargo, 
          injunction, law, proclamation, order, regulation or governmental 
          demand, the affected Party promptly shall notify the other Party in 
          writing of such cause and shall exercise diligent efforts to resume 
          performance under this Agreement as soon as possible. Neither Party 
          shall be liable to the other Party for any loss or damage due to 
          such cause. Neither Party may terminate this Agreement because of 
          such default or delay.

     13.7 ENTIRE AGREEMENT OF THE PARTIES; AMENDMENTS. This Agreement, 
          including the exhibits attached hereto which are incorporated 
          herein, constitutes and contains the entire understanding and 
          agreement of the Parties and cancels and supersedes any and all 
          prior negotiations, correspondence, understandings and agreements,

                                     -30-

<PAGE>

          whether verbal or written, between the Parties respecting the 
          subject matter hereof. No waiver, modification or amendment of any 
          provision of this Agreement shall be valid or effective unless made 
          in writing and signed by a duly authorized officer of each of the 
          Parties.

     13.8 SEVERABILITY. In the event that any of the provisions of this 
          Agreement shall for any reason be held by any court or authority of 
          competent jurisdiction to be invalid, illegal or unenforceable, 
          such provision or provisions shall be validly reformed to as nearly 
          as possible approximate the intent of the Parties and, if 
          unreformable, shall be divisible and deleted in such jurisdiction; 
          elsewhere, this Agreement shall not be affected so long as the 
          Parties are still able to realize the principal benefits bargained 
          for in this Agreement.

     13.9 CAPTIONS. The captions to this Agreement are for convenience only, 
          and are to be of no force or effect in construing or interpreting 
          any of the provisions of this Agreement.

     13.10 APPLICABLE LAW. This Agreement shall be governed by and 
          interpreted in accordance with the laws of The Commonwealth of 
          Massachusetts applicable to agreements made and performed wholly 
          within such state without regard to its principles of conflicts of 
          laws.

     13.11 NOTICES AND DELIVERIES. Any notice, requests, delivery, approval 
          or consent required or permitted to be given under this Agreement 
          shall be in writing and shall be deemed to have been sufficiently 
          given if delivered in person, transmitted by telecopy (with written 
          confirmation to follow via United States first class mail) or five 
          (5) days after being sent by United States certified mail to the 
          Party to whom it is directed at its address shown below or such 
          other address as such Party shall have last given by written notice 
          to the other Party in accordance with this Section.

          If to CBC, addressed to:

               Cambridge Biotech Corporation
               365 Plantation Street
               Worcester, MA 01605
               Attention: President
               Telecopy: 508-797-4014

          with a copy to:

               Attention: General Counsel
               Telecopy: 508-797-4014


                                     -31-

<PAGE>

          If to Progenics, addressed to:

               Progenics Pharmaceuticals, Inc.
               777 Old Saw Mill River Road
               Tarrytown, NY 10591

               Attention: Paul J. Maddon, M.D., Ph.D., CEO
               Telecopy: 914-789-2817

     13.12 COUNTERPARTS. This Agreement may be executed simultaneously 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.

     13.13 COMPLIANCE WITH LAWS. Progenics and CBC each shall comply with all 
          applicable laws in connection with its own performance under this 
          Agreement. Without limiting the generality of the foregoing, 
          Progenics shall be responsible for compliance with all applicable 
          product safety, product testing, product labeling, package marking, 
          and product advertising laws and regulations, except with respect 
          to efforts performed by CBC in which case CBC shall be responsible 
          for its activities as governed by such laws and regulations.

     13.14 SURVIVAL. The representations, warranties, covenants and 
          agreements made herein shall survive any investigation made by a 
          Party and shall be able to be relied fully on by the Parties.

     13.15 BANKRUPTCY COURT APPROVAL: ESCROW. The performance of either party 
          of its obligations hereunder is subject to approval of this 
          Agreement by the United States Bankruptcy Court for the District of 
          Massachusetts, Western Division. Within thirty days following 
          execution of this Agreement, CBC will deliver to a mutually 
          agreeable escrow agent all documentation set forth on EXHIBIT C, 
          attached hereto and made a part hereof, (the "Escrow 
          Documentation") necessary for Progenics to manufacture the Adjuvant 
          pursuant to the provisions of Section 8.5(b) of this Agreement. [***]
          At Progenics' expense, Progenics shall obtain a verification from
          Coopers & Lybrand, L.L.P. that the documentation delivered to the 
          Escrow Agent conforms with the definition of Escrow Documentation 
          as set forth in Exhibit C. The Escrow Documentation shall be held 
          by the escrow agent pursuant to the terms of a mutually agreeable 
          escrow agreement which shall


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                                     -32-

<PAGE>

          provide INTER ALIA for the updating of the Escrow Documentation as 
          necessary by CBC to insure that the Escrow Documentation is current 
          and for the delivery of the Escrow Documentation to CBC upon the 
          effective date of CBC's reorganization plan and prior to such date 
          for delivery of the Escrow Documentation to Progenics in the event 
          of the occurrence of an Inability to Supply or in the event that 
          CBC's Chapter 11 bankruptcy proceeding is converted to a Chapter 7 
          bankruptcy proceeding. The procedures set forth in this Section 
          13.15 respecting escrow shall apply each and every time, if any, 
          that CBC enters into reorganization or bankruptcy in the future.



IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be 
signed by their respective corporate officers, duly authorized as of the day 
and year first above written.

CAMBRIDGE BIOTECH CORPORATION           PROGENICS PHARMACEUTICALS, INC.

By: /s/ Alison Taunton-Rigby            By: /s/ Paul J. Maddon
   --------------------------              ---------------------------------
Name: Alison Taunton-Rigby              Name: Paul J. Maddon, M.D., Ph.D.
     -----------------------                 -------------------------------
Title: President and CEO                Title: CEO and Scientific Director
      ----------------------                  ------------------------------


                                     -33-

<PAGE>

                                  EXHIBIT A

                            LICENSED PATENT RIGHTS

U.S. Patent No. 5,057,540, entitled "Saponin Adjuvant" inventors Charlotte A. 
Kensil and Dante J. Marciani, issued October 15, 1991 (filed August 27, 1990).

     COUNTRY                                            SERIAL NUMBER

     Australia                                          19340/88
     Canada                                             568,119
     Denmark                                            6029/89
     Europe                                             88905332.8
     Japan                                              504974/1988
     PCT                                                PCT/US88/01842


<PAGE>

                                  EXHIBIT B

CAMBRIDGE BIOTECH CORPORATION      365 PLANTATION ST.       WORCESTER, MA 01605

                            CERTIFICATE OF ANALYSIS


                                      [***]

*** Confidential Treatment Requested

<PAGE>

                                   EXHIBIT C


                                      [***]




*** Confidential Treatment Requested

<PAGE>

[LOGO]  PROGENICS                                Progenics Pharmaceuticals, Inc.
                                                 Old Saw Mill River Road
                                                 Tarrytown, New York 10591
                                                 (914) 789-2800
                                                 Telefax:(914) 789-2817


September 6, 1995


Alison Taunton-Rigby, Ph.D.
Chief Executive Officer
Cambridge Biotech Corporation
365 Plantation Street
Worcester, MA 01605


Re:  Cambridge Biotech Corporation/Progenics License and Supply Agreement 
     (August 1995)

Dear Dr. Rigby,

This letter confirms our understanding that if pursuant to Paragraph 8.5(b) 
of the above-referenced agreement Progenics finds it necessary to manufacture 
the Adjuvant, CBC agrees that it will immediately execute and deliver a 
letter as set forth in Appendix A (attached).

Sincerely,


/s/ Paul J. Maddon
Paul J. Maddon, M.D., Ph.D.
Chairman and CEO
Scientific Director



Accepted:


/s/ Alison Tauton-Rigby

Alison Taunton-Rigby, Ph.D.
Chief Executive Officer
Cambridge Biotech Corporation

PJM/em



<PAGE>

                                                                 Exhibit 10.16

FINAL




                          CAMBRIDGE BIOTECH CORPORATION

                                      and

                         PROGENICS PHARMACEUTICALS, INC.

                                   SUBLICENSE


<PAGE>

 
                                TABLE OF CONTENTS

        BACKGROUND .........................................................1
1.      DEFINITIONS ........................................................2
2.      GRANT ..............................................................3
3.      ROYALTIES ..........................................................3
4.      PAYMENTS AND REPORTS ...............................................4
5.      BOOKS AND RECORDS ..................................................5
6.      NOTICES ............................................................5
7.      TERM AND TERMINATION ...............................................5
8.      NEGATION OF WARRANTIES AND INDEMNITY ...............................6
9.      LAWS AND REGULATIONS ...............................................7
10.     USE OF NAMES .......................................................7
11.     PATENT NOTICE ......................................................8
12.     MISCELLANEOUS PROVISIONS ...........................................8
        APPENDIX A ........................................................10
        APPENDIX B ........................................................11


                                      -i-

<PAGE>

                              SUBLICENSE AGREEMENT

     This is a SUBLICENSE AGREEMENT to be effective on the last date of the 
signature dates provided hereinbelow, by and between CAMBRIDGE BIOTECH 
CORPORATION (CBC), debtor and debtor in possession, Case No. 94-43054-JFQ, 
United States Bankruptcy Court for the District of Massachusetts, Western 
Division, a Delaware corporation, having offices at 365 Plantation Street, 
Worcester, Massachusetts 01605, and PROGENICS PHARMACEUTICALS, INC., a 
Delaware corporation having offices at 777 Old Saw Mill River Road, 
Tarrytown, New York 10591 (SUBLICENSEE).

                                  BACKGROUND

     In the course of research conducted at Harvard University, Department of 
Cancer Biology, Harvard School of Public Health, certain inventions were made 
relating to the HIV-1 envelope glycoprotein, designated gp120. Additional 
inventions relating to the HIV-1 envelope glycoprotein include gp160 and 
methods for assay.

     The President and Fellows of Harvard College ("Harvard") is the owner of 
these inventions, subject to rights reserved by the United States Government, 
pursuant to various assignments by Myron E. Essex and Tun-Hou Lee to Harvard 
of all their right, title and interest in and to the inventions and any 
patents resulting therefrom.

     Harvard has been granted U.S. Patent No. 4,725,669 entitled "Assay for 
Detecting Infection by Human T-Cell Lymphotrophic Virus-III" issued on 
February 16, 1988 directed to gp120 and cross-reactive peptides. Currently 
pending is a divisional application, U.S. Serial No. 056,134, filed May 29, 
1987, directed to gp160 and cross-reactive peptides and to methods for 
assaying for the glycoproteins.

     CBC is the exclusive, worldwide licensee of these inventions and the 
issued patent and pending patent applications by way of an exclusive license 
agreement from Harvard, and has the right to grant sublicenses thereunder for 
making, using or selling of the inventions which are disclosed and claimed in 
the issued patent and pending patent applications.

     SUBLICENSEE desires to use LICENSED PATENT RIGHTS in a commercial 
diagnostic, therapeutic, or vaccine application for public use and benefit or 
for selling products for research applications only.

     NOW THEREFORE, in consideration of the mutual covenants herein 
contained, the parties agree as follows:


                                       1

<PAGE>

1.   DEFINITIONS

     1.1. LICENSED PATENT RIGHTS shall mean U.S. Patent No. 4,725,669, issued 
February 16, 1988, and pending U.S. Patent Application Serial No. 056,134, 
filed May 29, 1987, and any divisionals, continuations, continuations-in-part 
based thereon, and any patents which may issue therefrom and any reissues, 
re-examinations, or extensions thereof; and any and all foreign patents and 
patent applications corresponding to any of the foregoing patents and patent 
applications, as well as such other patents or patent applications as are 
listed in Appendix A, effective as of the date said patents or patent 
applications are added to Appendix A, and the inventions described or claimed 
therein.

     1.2. FIELD OF USE shall mean products for research applications only.
     [***]









     1.3. LICENSED PRODUCT(S) shall mean goods covered by or made in 
accordance with LICENSED PATENT RIGHTS. For purposes of example only, 
LICENSED PRODUCT(S) may include bulk glycoprotein for use in research 
applications only.

     1.4.  [***]













     1.5. FIRST USE shall mean the date of the initial transfer by 
SUBLICENSEE of LICENSED PRODUCTS to any third party in exchange for cash or 
some equivalent to which value can be assigned for the purpose of determining 
the NET SALES.


                                        2

[***] Confidential Treatment Requested

<PAGE>

     1.6. EARNED ROYALTIES shall mean royalties paid or payable by 
SUBLICENSEE to CBC determined with respect to NET SALES.

     1.7. EFFECTIVE DATE shall mean the date of the last signature date(s) 
provided hereinbelow.

     1.8. PRIME LICENSE shall mean the exclusive license agreement between 
Harvard and CBC.

     1.9. SUBLICENSEE is understood to include all of its AFFILIATES. AN 
AFFILIATE of SUBLICENSEE shall mean any corporation or other business entity 
controlled by, controlling, or under common control with SUBLICENSEE. For 
this purpose, "control" means direct or indirect beneficial ownership of at 
least fifty percent (50%) of the voting stock or equity, or at least fifty 
percent (50%) interest in the income of such corporation or other business.

2.   GRANT

     2.1. CBC grants to SUBLICENSEE, subject to all the terms and conditions 
of this Agreement, a non-exclusive, worldwide right and license to make, have 
made, use, and sell LICENSED PRODUCTS under LICENSED PATENT RIGHTS in the 
Field of Use.

     2.2. CBC hereby grants to SUBLICENSEE the right to extend the license 
granted herein to an Affiliate, subject to the terms and conditions of this 
Agreement. CBC shall receive prompt written notice of each such extension and 
of any termination of such AFFILIATE license. SUBLICENSEE is expressly not 
granted a right to sublicense anyone other than an Affiliate under this 
Agreement.

3. ROYALTIES

   As consideration for the rights granted hereunder, SUBLICENSEE shall make 
the following payments to CBC:

   [***]






                                       3

[***] Confidential Treatment Requested

<PAGE>


     [***]








     3.3. Only one royalty shall be payable with respect to any LICENSED 
PRODUCT regardless of whether it or its use is covered by one or more 
LICENSED PATENT RIGHTS. On sales between SUBLICENSEE and its AFFILIATES for 
resale, the royalty shall be paid on the resale to any third-party purchaser.

4.   PAYMENTS AND REPORTS

     4.1. SUBLICENSEE agrees to notify CBC promptly, in writing, of the date 
of the FIRST USE of LICENSED PRODUCT(S).

     4.2. Beginning with date of FIRST USE, SUBLICENSEE shall pay to CBC 
EARNED ROYALTIES within sixty (60) days from the end of each calendar 
quarter, which is the end of March, June, September, and December. Any 
royalties not paid within this time period shall be deemed past due 
royalties. Any past due royalties shall bear interest at the rate of   
         [***]        PER ANNUM from their due date, which interest shall 
be paid by SUBLICENSEE to CBC.

     4.3. SUBLICENSEE shall also prepare for each calendar quarter a written 
report in the form substantially as set forth in Appendix B setting forth the 
NET SALES and the EARNED ROYALTIES payable thereon, including a detailed 
listing of all LICENSED PRODUCTS sold and all deductions from NET SALES. The 
reports required by this Agreement shall be certified by an officer of 
SUBLICENSEE to be correct to the best of SUBLICENSEE's knowledge and 
information.

     4.4. All amounts payable to CBC shall be paid in United States Dollars. 
In the event any LICENSED PRODUCT shall be sold for funds other than United 
States funds, the NET SALES of such product shall first be determined in the 
foreign funds and then converted into the equivalent United States funds at:

          (i)  the rate applicable to the transfer of funds arising from 
          royalty payments as established by the exchange control authorities 
          of the country of which such funds are the national currency, for the
          last business day of the accounting period for which payment is thus 
          made; or

          (ii) if there is no rate so applicable, then the buying rate for such
          foreign funds as published by the Wall Street Journal on the last 
          business day of such calendar accounting period.


                                       4

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<PAGE>

5.   BOOKS AND RECORDS

     5.1. SUBLICENSEE shall keep, and shall require its AFFILIATES to keep, 
accurate and correct records of calculations for determining EARNED ROYALTIES 
on sales of LICENSED PRODUCTS made, used and sold under this Agreement, 
appropriate to determine the amount of EARNED ROYALTIES based on NET SALES at 
least three (3) years following a given reporting period. The records shall 
be available during normal business hours for inspection at the expense of 
CBC by a certified public accountant, selected by CBC and acceptable to 
SUBLICENSEE, for the sole purpose of verifying reports and payments 
hereunder. The accountant shall not disclose to CBC any financial information 
other than that information relating to the accuracy of reports and payments 
made under this Agreement.

6.   NOTICES

     6.1. Any notice required by this Agreement shall be sent by registered 
or certified mail properly addressed or by telex or facsimile, with a mailed 
confirmation copy, properly addressed to the other party at the address 
designated below, or to another address as may be designated in writing by 
the party. The notice shall be effective as of the date of the postmark of 
such mailed notice.

For CBC:

CAMBRIDGE BIOTECH CORPORATION
365 Plantation Street
Worcester, Massachusetts 01605
Attn: President
with a copy Attn: General Counsel

FOR SUBLICENSEE:

PROGENICS PHARMACEUTICALS, INC.

777 Old Saw Mill River Road
Tarrytown, NY 10591
Attn: Chief Executive Officer

7.   TERM AND TERMINATION

     7.1. The term of this Agreement, unless sooner terminated as provided 
herein, shall extend from the EFFECTIVE DATE until expiration of the last to 
expire patents included in LICENSED PATENT RIGHTS.

                                       5

<PAGE>

     7.2. Upon any breach of, or default under, this Sublicense Agreement by 
SUBLICENSEE, CBC may terminate this Agreement by giving ninety (90) days 
written notice to SUBLICENSEE. The termination shall take effect at the end 
of the ninety-day period, unless during the period SUBLICENSEE cures such 
breach or default to CBC's satisfaction.

     7.3. SUBLICENSEE has the right to terminate this Agreement at any time 
upon giving ninety (90) days written notice to that effect to CBC.

     7.4. Termination of this Agreement shall not affect any rights or 
obligations accrued prior to the date of the termination, including 
SUBLICENSEE's obligation to pay all EARNED ROYALTIES and SUBLICENSEE's 
obligation to indemnify CBC. Upon termination of this Agreement all unpaid 
EARNED ROYALTIES due to CBC shall become immediately due and payable.

     7.5. Waiver by CBC of a single default or breach or of succession of 
defaults or breaches shall not deprive CBC of any right to terminate this 
Agreement pursuant to the terms hereof upon the occasion of any subsequent 
default or breach.

     [***]
     7.6. If the PRIME LICENSE between Harvard and CBC is terminated, this 
Agreement between CBC and SUBLICENSEE shall, assigned to Harvard, and Harvard 
shall accept such assignment. CBC shall notify SUBLICENSEE if the PRIME 
LICENSE is terminated.




8.   NEGATION OF WARRANTIES AND INDEMNITY

     8.1. CBC has the right to enter into this Agreement notwithstanding its 
bankruptcy filings. CBC makes no representations or warranties as to the 
validity or scope of any LICENSED PATENT RIGHTS.

     8.2. CBC makes no representations or warranties that the manufacture, 
use, sale or other disposal of the LICENSED PRODUCTS is or will be free from 
infringement of patents of third parties.

     8.3. CBC makes no representations or warranties whatsoever, either 
express or implied, as to the merchantability or fitness of the LICENSED 
PRODUCTS for a particular purpose, and SUBLICENSEE shall make no statements, 
representations or warranties whatsoever to any third parties which are 
inconsistent with such disclaimer by CBC.

     8.4. SUBLICENSEE shall defend, indemnify and hold harmless CBC and 
Harvard, their directors, officers, employees, and agents, from and against 
any and all claims, demands, damages, losses, and expenses of any nature, 
including attorney's fees, for but not limited to death, personal injury, 
illness, property damage or products liability arising from or in

                                       6

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<PAGE>

connection with any of the following:

           (1)    the use by SUBLICENSEE of any method or process related to 
           the LICENSED PATENT RIGHTS; or

           (2)    any use, sale or other disposition of any of the LICENSED 
           PRODUCTS by SUBLICENSEE or any statement, representation or 
           warranty of SUBLICENSEE with respect thereto; or

           (3)    the use by any person of the LICENSED PRODUCTS made by 
           SUBLICENSEE.

     CBC shall reasonably cooperate with SUBLICENSEE in defending any such 
claim. CBC shall be entitled to receive information regarding the status of 
any such matter and shall be entitled to retain counsel on its own behalf and 
at its sole expense if CBC is named as a party or if CBC is not satisfied 
with the defense provided by SUBLICENSEE for any reason, the rights and 
obligations of this paragraph shall survive termination or expiration of the 
Agreement. CBC and/or Harvard may, at its option, require SUBLICENSEE to name 
CBC and/or Harvard as a co-insured on a product liability insurance policy 
deemed sufficient by CBC.

 9.   LAWS AND REGULATIONS

     9.1. SUBLICENSEE shall comply with all foreign and United States 
federal, state, and local laws, regulations, rules and orders applicable to 
the testing, production, transportation, packaging, labeling, sale and use of 
the LICENSED PRODUCTS.

10.  USE OF NAMES

     10.1. SUBLICENSEE shall not use the names "Harvard College" or 
"Harvard," the names of the inventors, "Myron E. Essex," or "Tun-Hou Lee," or 
the name "Cambridge Biotech Corporation" or any other name or mark by which 
Harvard or CBC may be identified for any purpose without prior written 
consent obtained from the respective parties in each instance.

     10.2. CBC shall not use the names "Progenics" or "Progenics 
Pharmaceuticals, Inc." or any other name or mark by which SUBLICENSEE may be 
identified for any purpose without prior written consent obtained from 
SUBLICENSEE in each instance.

                                       7

<PAGE>


11.  PATENT NOTICE

     11.1. SUBLICENSEE shall apply the patent marking notices required by the 
laws of the United States and relevant countries.

12.  MISCELLANEOUS PROVISIONS

     12.1. This Agreement constitutes the entire understanding between the 
parties with respect to the subject matter hereof and supersedes and replaces 
all prior agreements, understandings, writings, and discussions between the 
parties relating to said subject matter.

     12.2. This Agreement may be amended only by a written instrument 
executed by the parties.

     12.3. Without prior written approval of CBC and Harvard, the license 
granted pursuant to this Agreement shall not be assigned or transferred by 
SUBLICENSEE to any other party other than to a successor to the entire 
business interest of SUBLICENSEE.

     12.4. This Agreement shall be binding upon and inure to the benefit of 
and be enforceable by the parties hereto and their respective successors and 
permitted assigns.





                  [Balance of page intentionally left blank]


                                       8

<PAGE>


     12.5. This Agreement shall be governed and construed and interpreted in 
accordance with the laws of the Commonwealth of Massachusetts.

     IN WITNESS WHEREOF, this Agreement is executed by the parties hereinbelow:

CAMBRIDGE BIOTECH CORPORATION

By: /s/ Jeffrey Beaver                                 March 13, 1995
    -----------------------                            -----------------------
    Jeffrey T. Beaver                                  Date
    Chief Executive Officer

PROGENICS PHARMACEUTICALS, INC.

By: /s/ Paul J. Maddon                                  March 7, 1995
    ------------------------                            -----------------------
    Paul J. Maddon, M.D. Ph.D.                          Date
    Chairman and CEO

AGREED AS TO SECTION 7.6:

PRESIDENT AND FELLOWS HARVARD COLLEGE

By: /s/ Joyce Brinton                                   3/17/95   
    -------------------------                           ------------------------
    Joyce Brinton, Director                             Date
    Office for Technology and Trademark Licensing

                                       9

<PAGE>

                                   APPENDIX A

1.  U.S. PATENT NO. 4,725,669

Title:         ASSAY FOR DETECTING INFECTION BY HUMAN T-CELL
                LYMPHOTROPHIC VIRUS-III
Inventors:     Myron E. Essex and Tun-Hou Lee
Filed:         November 9, 1984
Issued:        February 16, 1988

     The claims of this patent are directed to gp120 and cross-reactive 
peptides.

2.   U.S. PATENT APPLICATION SERIAL NO. 056,134

Title:         ASSAY FOR DETECTING INFECTION BY HUMAN T-CELL
                LYMPHOTROPHIC VIRUS-III
Inventors:     Myron E. Essex and Tun-Hou Lee
Filed:         May 29, 1987
Cross-Reference:    division of U.S. 4,725,669
Issued:        currently pending

     This is a divisional application of U.S. 4,725,669, directed to methods 
of assay using the proteins covered by the patent and to gp160 and 
cross-reactive peptides.

                                      10

<PAGE>

                                   APPENDIX B

                              FORM OF ROYALTY REPORT

For each Licensed Product, SUBLICENSEE shall report the following information:

     Gross amount billed or invoiced

     Deductions allowable under Section 1.4

     Resulting Net Sales

     Amount received

     Effective royalty rate

     Amount of Earned Royalties payable with report

                                      11



<PAGE>

                                                                 Exhibit 10.17

                   COOPERATIVE RESEARCH AND DEVELOPMENT AGREEMENT

                                ARTICLE 1. INTRODUCTION

   This Cooperative Research and Development Agreement (CRADA) between the 
Centers for Disease Control and Prevention (CDC) and the Collaborator will be 
effective when signed by all parties. By signing this CRADA, the Collaborator 
acknowledges that it has received and read a copy of the Policy Statement on 
Cooperative Research and Development Agreements and Intellectual Property 
Licensing which is attached as Appendix A. The Research and Development 
project(s) which will be undertaken by each of the Parties in the course of 
this CRADA is detailed in the Research Plan (RP) which is attached as 
Appendix B. The funding and staffing commitments of the Parties are set forth 
in Appendix C. Any exceptions or changes to the CRADA are set forth in 
Appendix D.

                              ARTICLE 2. DEFINITIONS

As used in this CRADA, the following terms shall have the indicated meanings:

2.1   "COOPERATIVE RESEARCH AND DEVELOPMENT AGREEMENT" or "CRADA" means this 
      Agreement, entered into by CDC pursuant to the Federal Technology Transfer
      Act of 1986 and Executive Order 12591 of October 10, 1987.

2.2   "PROPRIETARY INFORMATION" means confidential scientific, business or 
      financial information provided that such information:

      2.2.1   Is not publicly known or available from other sources who are 
               not under a confidentiality obligation to the source of the
               information;

      2.2.2   Has not been made available by its owners to others without a 
               confidentiality obligation;

      2.2.3   Is not already available to the receiving Party without a 
               confidentiality obligation; and

      2.2.4   Does not relate to potential hazards or cautionary warnings 
               associated with the production, handling or use of the subject 
               matter of the Research Plan of this CRADA.

2.3   "SUBJECT DATA" means all recorded information first produced in the 
      performance of this CRADA.

2.4   "RESEARCH RESULTS" means all tangible materials other than Subject Data 
      first produced in the performance of this CRADA.

2.5   "SUBJECT INVENTION" means any invention conceived and reduced to 
      practice in the performance of research under this CRADA that may be 
      patentable under 35 U.S.C. Section 101 or Section 161, protectable under
      7 U.S.C. Section 2321, or otherwise protectable by other types of U. S.
      or foreign Intellectual Property (IP) fight.

2.6   "GOVERNMENT" means the U. S. Government and any of its agencies.

2.7    "RESEARCH PLAN" or "RP" means the statement in Appendix B of the 
       respective research and development commitments of the Parties to this 
       CRADA.

2.8    "PRINCIPAL INVESTIGATOR" or "PI" means each of the persons designated 
       respectively by the Parties to this CRADA who will be responsible for 
       the scientific and technical conduct of the RP.

                                       2

<PAGE>

                        ARTICLE 3. COOPERATIVE RESEARCH

3.1    RESEARCH TEAM. The Parties agree to establish a joint research and 
       development team (hereinafter referred to as the "Team") comprising at
       least the Principal Investigators designated pursuant to Article 3.3 to 
       conduct and monitor the research in accordance with the RP. Although 
       members of the Team shall be considered as having been delegated to the 
       Team, they shall continue to remain employed by their respective 
       employers under their respective terms of employment.

3.2    REVIEW OF WORK. Periodic conferences shall be held by the Team to 
       review work progress; it is understood that the nature of this 
       cooperative research precludes guarantee of its completion within 
       the specified period of performance or limits of allocated financial or 
       staffing support. Accordingly, research under this CRADA is to be 
       performed on a best efforts basis.

3.3    PRINCIPAL INVESTIGATORS. CDC research work under this CRADA will be 
       performed by the Laboratory identified in the RP, and the CDC Principal 
       Investigator (PI) designated in the RP will be responsible for the 
       scientific and technical conduct of this project on behalf of CDC. Also 
       designated in the RP is the Collaborator PI who will be responsible for 
       the scientific and technical conduct of this project on behalf of the 
       Collaborator.

3.4    RESEARCH PLAN CHANGE. The RP may be modified by mutual written consent of
       the Principal Investigators. Substantial changes in the scope of the RP 
       will be treated as amendments under Article 14.6

                               ARTICLE 4. REPORTS

4.1    INTERIM REPORTS. The Parties shall exchange formal written interim 
       progress reports on a schedule agreed to by the PIs, but at least within 
       six (6) months after this CRADA becomes effective and at least within 
       every six (6) months thereafter. Such reports shall set forth the 
       technical progress made, identifying such problems as may have been 
       encountered and establishing goals and objectives requiring further 
       effort.

4.2    FINAL REPORTS. The Parties shall exchange final reports of their results 
       within four (4) months after completing the projects described in the RP 
       or after the termination of this CRADA.

                 ARTICLE 5. FINANCIAL AND STAFFING OBLIGATIONS

5.1    CDC AND COLLABORATOR CONTRIBUTIONS. The CDC contribution to the RP in 
       the form of personnel, services and property is designated in Appendix C.
       The Collaborator contribution to the RP in the form of personnel, 
       services, property, support for staffing and/or funding is designated in 
       Appendix C. Payment schedules, if applicable, are also indicated in 
       Appendix C.

5.2    INSUFFICIENT AND EXCESS FUNDS. CDC shall not be obligated to perform any 
       of the research specified herein or to take any other action required by 
       this CRADA if the funding is not provided as set forth in Appendix C. 
       CDC shall return excess funds to the Collaborator when it sends its 
       final fiscal report pursuant to Article 5.3, except for staffing support 
       pursuant to Article 11.3.

5.3    ACCOUNTING RECORDS. CDC shall maintain separate and distinct current 
       accounts, records, and other evidence supporting all its obligations 
       under this CRADA, and shall provide the Collaborator with an annual 
       report reflecting the use of the Collaborator's funds and a final fiscal 
       report at the time that final reports are exchanged pursuant to 
       Article 4.2.

                                       3

<PAGE>

                      ARTICLE 6. TITLE TO PROPERTY

6.1    CAPITAL EQUIPMENT. The purchase or use of capital equipment to carry 
       out this CRADA does not affect the ownership rights that would otherwise 
       apply. Equipment purchased by CDC with funds provided by the 
       collaborator shall be the property of CDC. All capital equipment 
       provided under this CRADA by one party for the use of another Party 
       remains the property of the providing Party unless other disposition is 
       mutually agreed upon in writing by the collaborating parties. If title 
       to this equipment remains with the providing Party, that Party is 
       responsible for maintenance of the equipment and the costs of its 
       transportation to and from the site where it will be used.

         ARTICLE 7. INTELLECTUAL PROPERTY RIGHTS AND APPLICATIONS

7.1    REPORTING. The Parties shall promptly report to each other in writing 
       each Subject Invention resulting from the research conducted under this 
       CRADA that is reported to them by their respective employees. Such 
       reports shall be treated in confidence by the receiving Party until 
       such time as a patent or other Intellectual Property (IP) application, 
       as appropriate, claiming that Subject Invention has been filed.
       Because of the royalty sharing provisions for Government inventors in 
       the Federal Technology Transfer Act of 1986, and in view of Article 8.4
       of this CRADA which grants the Government a research license on 
       inventions made solely by the Collaborator, the Collaborator 
       acknowledges a special duty to report all Subject Inventions to CDC so 
       that CDC may determine whether or not inventors properly includes CDC
       investigators.

7.2    COLLABORATOR EMPLOYEE INVENTIONS. The Collaborator may elect to retain 
       IP rights to any Subject Invention made solely by a Collaborator 
       employee. The Collaborator shall notify CDC promptly upon making this 
       election. If the Collaborator does not elect to retain its IP rights, 
       the Collaborator shall offer to assign these IP rights to the Subject 
       Invention to CDC pursuant to Article 7.5. If CDC declines such 
       assignment, the Collaborator may release its IP rights to its employee 
       inventors pursuant to Article 7.6.

7.3    CDC EMPLOYEE INVENTION. CDC, on behalf of the U.S. Government, may elect 
       to retain IP fights to each Subject Invention made solely by CDC 
       employees. If CDC does not elect to retain IP rights, CDC shall offer to 
       assign these IP rights to such Subject Invention to the Collaborator 
       pursuant to Article 7.5. If the Collaborator declines such assignment, 
       CDC may release IP rights in such Subject Invention to its employee 
       inventors pursuant to Article 7.6.

7.4    JOINT INVENTIONS. Each Subject Invention made jointly by CDC and 
       Collaborator employees shall be jointly owned by CDC and the 
       Collaborator. The Collaborator may elect to file the joint patent or 
       other IP application(s) thereon and shall notify CDC promptly upon making
       this election. If the Collaborator decides to file such applications, it
       shall do so in a timely manner and at its own expense. If the 
       Collaborator does not elect to file such application(s), CDC on behalf of
       the U.S. Government, shall have the right to file the joint applications 
       in a timely manner and at its own expense. If either Party decides not 
       to retain its IP rights to a jointly owned Subject Invention, it shall 
       offer to assign such rights to the other Party pursuant to Article 7.5. 
       If the other Party declines such assignment, the offering Party may 
       release its IP rights to employee inventors pursuant to Article 7.6.

7.5    FILING OF PATENT APPLICATIONS. With respect to Subject Inventions made 
       by the Collaborator as described in Article 7.2 or by CDC as described 
       in Article 7.3, a Party exercising its right to elect to retain IP rights
       to a Subject Invention agrees to file patent or other IP applications in 
       a timely manner and at its own expense. The Party may elect not to file 
       a patent or other IP application thereon in any particular country or 
       countries provided it so advises the other Party ninety (90) days prior 
       to the expiration of any applicable filing deadline, priority period or 
       statutory bar date, and hereby agrees to assign its IP rights, title 
       and interest in such country or countries to the Subject Invention to 
       the other Party and to cooperate 

                                       4

<PAGE>

       in the preparation and filing of a patent or other IP applications. 
       In any countries in which title to patent or other IP fights is 
       transferred from CDC to the Collaborator, the Collaborator agrees that 
       CDC inventors will share in any royalty distribution that the 
       Collaborator pays to its own inventors.

7.6    RELEASE TO INVENTORS. In the event neither of the Parties to this CRADA 
       elects to file a patent or other IP application on a Subject Invention, 
       either or both (if a joint invention) may release their IP rights to
       their respective employee inventor(s) with a nonexclusive, 
       non-transferrable, royalty-free license being retained by each Party.

7.7    PATENT EXPENSES. The expenses attendant to the filing of patent or 
       other IP applications generally shall be paid by the Party filing such 
       application. If an exclusive license to any Subject Invention is granted 
       to the Collaborator by CDC, the Collaborator shall reimburse CDC for the 
       reasonable past and ongoing funds expended worldwide for filing 
       prosecuting and maintaining any applications. The Collaborator may waive 
       its exclusive license fights on any application, patent or other IP 
       grant at any time, and incur no subsequent compensation obligation for 
       that application, patent or IP grant.

7.8    PROSECUTION OF INTELLECTUAL PROPERTY APPLICATIONS. Each Party shall 
       provide the other Party with copies of the applications it files on any 
       Subject Invention along with the power to inspect and make copies of all 
       documents retained in the patent or other IP application files by the 
       applicable patent or other IP office. The Parties agree to consult with 
       each other with respect to the prosecution of Subject Inventions 
       described in Article 7.3 and joint Subject Inventions described in 
       Article 7.4. If the Collaborator elects to file and prosecute IP 
       applications on joint Subject Inventions pursuant to Article 7.4, CDC 
       will be granted an associate power of attorney (or its equivalent) on 
       such IP applications.

                                ARTICLE 8. LICENSING

8.1    OPTION FOR EXCLUSIVE COMMERCIALIZATION LICENSE. With respect to        
       Government IP rights to any Subject Invention not made solely by the
       Collaborator's employees for which a patent or other IP application is
       filed, CDC grants to the Collaborator an option to negotiate, in good 
       faith, the terms of an exclusive or nonexclusive commercialization 
       license that fairly reflects the relative contributions of the Parties 
       to the invention and the CRADA, the risks incurred by the Collaborator, 
       and the costs of subsequent research and development needed to bring 
       the invention to the marketplace. The license will specify the licensed 
       fields of use, breadth of exclusivity and royalties. Royalty rates will 
       be based on product sales and the rates conventionally granted in the 
       field identified in the RP for inventions with reasonably similar 
       commercial potential Royalty rates generally will not exceed a rate 
       within the range of [***]   for extensive commercialization licenses. 
       Contingent royalty schemes based on, e.g., patent issuance or 
       nonissuance, and provisions treating the stacking of royalties or 
       packaging of other licensed inventions developed under this CRADA may be
       provided. Extensive licensees will be expected to reimburse CDC for IP 
       expenses related to each licensed intellectual property, and may be 
       permitted to offset such reimbursement against future product royalties.

8.2    EXERCISE OF LICENSE OPTION. The option of Article 8.1 must be exercised 
       by written notice mailed within three (3) months after the patent or 
       other IP application is filed to:

               CDC Technology Transfer Coordinator
               Centers for Disease Control
               1600 Clifton Road, N.E.
               Building 1, B72, Mailstop A20
               Atlanta, Georgia 30333

                                       5

[***] Confidential Treatment Requested

<PAGE>

       Exercise of this option by the Collaborator initiates a negotiation 
       period that expires nine (9) months after the patent or other IP 
       application filing date. If the last proposal by the Collaborator has 
       not been responded to in writing by CDC within this nine (9) month 
       period, the negotiation period shall be extended to expire one (1) month
       after CDC so responds, during which month the Collaborator may accept in
       writing the final license proposal of CDC. After that time, CDC will be 
       free to license such IP rights to others.

8.3    PRICING. CDC has a concern that there be a reasonable relationship 
       between the pricing of a licensed product, the public investment in that 
       product, and the health and safety needs of the public. Accordingly, 
       extensive commercialization licenses granted for CDC intellectual 
       property rights may require that this relationship be supported by 
       reasonable evidence.

8.4    GOVERNMENT INTELLECTUAL PROPERTY RIGHTS. For inventions developed wholly 
       by CDC investigators or jointly with a Collaborator under this CRADA, 
       CDC is required by the Federal Technology Transfer Act of 1986, 15 U.S.C.
       at Section 3710a(b)(2), to retain at least a nonexclusive, irrevocable,
       paid-up license to practice the invention or to have the invention
       practiced throughout the world by or on behalf of the U.S. Government.
       For inventions developed wholly by the Collaborator under this CRADA,
       the Collaborator agrees to grant a research license as described in
       Article 8.5 to the Government.

8.5    RESEARCH LICENSES. CDC reserves the right under any IP license granted 
       by CDC to the Collaborator under this CRADA to grant nonexclusive 
       licenses to third parties to make and to use the licensed invention for 
       purposes of research involving the invention ifself, and not for 
       purposes of commercial manufacture or in lieu of purchase as a commercial
       product for use in other research. CDC intends to consult with their 
       exclusive commercialization licensee(s) before granting research licenses
       to commercial entities.

8.6    JOINT INVENTIONS NOT EXCLUSIVELY LICENSED. In the event that the 
       Collaborator does not choose to acquire an exclusive commercialization 
       license to IP rights in joint Subject Inventions described in Article 
       7.4, then each Party shall have the right to use the joint Subject 
       Invention and to license its use to others. The Parties may agree to a 
       joint licensing approach for such IP rights.

                     ARTICLE 9. PROPRIETARY RIGHTS AND PUBLICATION

9.1    RIGHT OF ACCESS. CDC and the Collaborator agree to exchange all Subject 
       Data and Research Results produced in the course of research under this 
       CRADA, whether developed solely by CDC, jointly with the Collaborator, or
       solely by the Collaborator. Tangible research products developed under a 
       CRADA will be shared equally by the Parties to the CRADA unless other 
       disposition is agreed to by the Principal Investigators. All Parties to 
       this CRADA will be free to utilize Subject data and Research Results for
       their own purposes, consistent with their obligations under this CRADA.

9.2    OWNERSHIP OF SUBJECT DATA IN RESEARCH RESULTS. Subject to the sharing 
       requirements of Article 9.1, the producing Party will retain ownership 
       of and title to all Subject Inventions, all Subject Data and all 
       Research Results produced solely by their investigators. Jointly 
       developed Subject Inventions, Subject Data and Research Results will be 
       jointly owned. However, except as may be afforded through IP rights that 
       require public disclosure of the protected subject matter (e.g., 
       patents), CDC does not have statutory authority to limit (or agree with 
       the Collaborator to limit) dissemination of Subject Data or Research 
       Results developed solely by CDC investigators or jointly with the 
       Collaborator. Accordingly, CDC may not agree to exclude others from 
       utilizing or commercializing such Subject Data or Research Results. 

                                       6

<PAGE>


9.3    PROPRIETARY AND CONFIDENTIAL INFORMATION. Each Party agrees to limit its 
       disclosure of Proprietary Information to the amount necessary to carry 
       out the Research Plan of this CRADA, and shall place a confidentiality 
       notice on all such information. Research materials required for the RP 
       may also be designated as Proprietary Information.

       Each Party receiving Proprietary Information agrees that any information 
       so designated shall be used by it only for the purposes described in the 
       attached Research Plan. Any Party may object to the designation of 
       information as Proprietary Information by another Party and may decline 
       to accept such information. Data and research products developed solely 
       by the Collaborator may be designated as Proprietary Information when 
       they are wholly separable from the data and research product categories 
       as set forth in the RP. The exchange of confidential information should 
       be similarly limited and treated. Unless disclosure is otherwise 
       mutually agreed upon, all Parties to this CRADA agree to keep CRADA 
       Subject Data and Research Results confidential, to the extent permitted 
       by law, until they arc published or corresponding patent or other IP 
       application(s) have been filed.

9.4    PROTECTION OF PROPRIETARY INFORMATION. Proprietary Information shall not 
       be disclosed, copied, reproduced or otherwise made available to any 
       other person or entity without the consent of the owning Party except as 
       may be required under court order or the Freedom of Information Act (5 
       U.S.C. Section 552). Each Party agrees to use its best efforts to main-
       tain the confidentiality of Proprietary Information. Each Party agrees
       that another Party is not liable for the disclosure of Proprietary 
       Information which, after notice to and consultation with the concerned 
       Party, another Party in possession of the Proprietary Information 
       determines the information may not lawfully bc withheld, provided the 
       concerned Party has been given an opportunity to obtain a court order to 
       enjoin disclosure.

9.5    DURATION OF CONFIDENTIALITY OBLIGATION. The obligation to maintain the 
       confidentiality of Proprietary Information shall expire at the earlier of
       the date when the information is no longer Proprietary Information as 
       defined in Article 2.2 or three (3) years after the expiration or 
       termination date of this CRADA. The Collaborator may request an extension
       to this term when necessary to protect Proprietary Information relating 
       to products not yet commercialized.

9.6    PUBLICATION. The Parties are encouraged to make publicly available the 
       results of their research. Before either Party submits a paper or 
       abstract for publication or otherwise intends to publicly disclose 
       information about a Subject Invention, Subject Data or Research Results,
       the other Party shall be provided thirty (30) days to review the 
       proposed publication or disclosure to assure that Proprietary 
       Information is protected. The publication or other disclosure shall be 
       delayed for up to (thirty) 30 additional days upon written request by 
       any Party as necessary to preserve U.S. or foreign patent or other IP 
       rights.

                   ARTICLE 10. REPRESENTATIONS AND WARRANTIES

10.1   REPRESENTATIONS AND WARRANTIES OF CDC. CDC hereby represents and warrants
       to the Collaborator that the Official signing this CRADA has authority to
       do so.

10.2   REPRESENTATIONS AND WARRANTIES OF THE COLLABORATOR. The Collaborator 
       hereby represents and warrants to CDC that the Collaborator has the 
       requisite power and authority to enter into this CRADA and to perform 
       according to its terms, and that the Collaborator's Official signing 
       this CRADA has authority to do so. The Collaborator further represents 
       that it is financially able to satisfy any funding commitments made in 
       Appendix C.


                                       7

<PAGE>

                           ARTICLE 11. TERMINATION

11.1   TERMINATION BY MUTUAL CONSENT. The CDC and the Collaborator may terminate
       this CRADA, or portions thereof, at any time by mutual written consent. 
       In such event the Parties shall specify the disposition of all property,
       inventions, patents and other IP applications and other results of work
       accomplished or in progress, arising from or performed under this CRADA.

11.2   UNILATERAL TERMINATION. Either CDC or the Collaborator may unilaterally 
       terminate this entire CRADA at any time by giving the written notice at 
       least thirty (30) days prior to the desired termination date, and any 
       rights accrued in property, patents or other IP shall be disposed of as 
       in 11.1.

11.3   STAFFING. If this CRADA is mutually or unilaterally terminated prior to 
       its expiration, funds will nevertheless remain available to CDC for 
       continuing any staffing commitment made by the Collaborator pursuant 
       to Article 5.1 above and Appendix C, ff applicable, for a period of six 
       (6) months after such termination. If there are insufficient funds to 
       cover this expense, the Collaborator agrees to pay the difference.

11.4   NEW COMMITMENTS. No party shall make new commitments related to this 
       CRADA after a mutual or unilateral termination and shall, to the extent 
       feasible, cancel all outstanding commitments and contracts by the 
       termination date.

11.5   TERMINATION COSTS. Concurrently with the exchange of final reports 
       pursuant to Articles 4.2 and 5.3, CDC shall submit to the Collaborator 
       for payment a statement of all costs incurred prior to the date of
       termination and for all reasonable termination costs including the cost 
       of returning Collaborator property or removal of abandoned property.

                              ARTICLE 12. DISPUTES

12.1   SETTLEMENT. Any dispute arising under the CRADA which is not disposed of 
       by agreement of the Principal Investigators shall bc submitted jointly 
       to the signatories of this CRADA. If the signatories are unable to 
       jointly resolve the dispute within thirty (30) days after notification 
       thereof, the Assistant Secretary of Health (or his/her designee) shall 
       propose a resolution. Nothing in this section shall prevent any Party 
       from pursuing any and all administrative and/or judicial remedies which 
       may be available.

12.2   CONTINUATION OF WORK. Pending the resolution of any dispute or claim 
       pursuant to this Article, the Parties agree that performance of all 
       obligations shall be pursued diligently in accordance with the direction 
       of the CDC signatory.

                            ARTICLE 13. LIABILITY

13.1   PROPERTY. The U.S. Government shall not be responsible for damages to any
       property of the Collaborator provided to CDC or acquired by CDC pursuant
       to this CRADA.

13.2   NO WARRANTY. Except as specifically stated in Article 10, the Parties 
       make no express or implied warranty as to any matter whatsoever, 
       including the conditions of the research or any invention or product,
       whether tangible or intangible, made, or developed under this CRADA, or
       the ownership, merchantability, or fitness for a particular purpose of 
       the research or any invention or product.

                                       8

<PAGE>

13.3   INDEMNIFICATION. The Collaborator agrees to hold the U.S. Government 
       harmless and to indemnify the Government for all liabilities, demands,
       damages, expenses and losses arising out of the use by the Collaborator
       for any purpose of the Subject Data, Research results and/or Subject 
       Inventions produced in whole or part by CDC employees under this CRADA,
       unless due to the negligence of CDC, its employees or agents. The 
       Collaborator shall be liable for any claims or damages it incurs in 
       connection with this CRADA. CDC has no authority to indemnify the 
       Collaborator.

13.4   FORCE MAJEURE. Neither party shall be liable for any unforeseeable event
       beyond its reasonable control not caused by the fault or negligence of 
       such Party, which causes such Party to be unable to perform its 
       obligations under this CRADA, and which it has been unable to overcome by
       the exercise of due diligence. In the event of the occurrence of such a 
       force majeure event, the Party unable to perform shall promptly notify 
       the other Party. It shall further use its best efforts to resume 
       performance as quickly as possible and shall suspend performance only 
       for such period of time as necessary as a result of the force majeure 
       event.

                           ARTICLE 14. MISCELLANEOUS

14.1   GOVERNING LAW. The construction, validity, performance and effect of 
       this CRADA shall be governed by Federal Law, as applied by the Federal 
       Courts. Federal law and regulations will preempt any conflicting or 
       inconsistent provisions in this CRADA.

14.2   ENTIRE AGREEMENT. This CRADA constitutes the entire agreement between 
       the Parties concerning the subject matter of this CRADA and supersedes 
       any prior understanding of written or oral agreement. 

14.3   HEADINGS. Titles and headings of the sections and subsections of this 
       CRADA are for the convenience of references only and do not form a 
       part of this CRADA and shall in no way affect its interpretation. 

14.4   WAIVERS. None of the provisions of this CRADA shall be considered waived 
       by any Party unless such waiver is given in writing to the other Party. 
       The failure of a Party to insist upon strict performance of any of the 
       terms and conditions hereof, or failure or delay to exercise any rights 
       provided herein or by law, shall not be deemed a waiver of any rights of 
       any Party.

14.5   SEVERABILITY. The illegality or invalidity of any provisions of this 
       CRADA shall not impair, affect or invalidate the other provisions of 
       this CRADA.

14.6   AMENDMENTS. If either party desires a modification to this CRADA, the 
       Parties shall, upon reasonable notice of the proposed modification or 
       extension by the Party desiring the change, confer in good faith to 
       determine the desirability of such modification or extension. Such 
       modification shall not be effective until a written amendment is signed 
       by the signatories to this CRADA or by their representatives duly 
       authorized to execute such amendment. 

14.7   ASSIGNMENT. Neither this CRADA nor any rights or obligations of any 
       Party hereunder shall be assigned or otherwise transferred by either 
       Party without the prior written consent of the other Party. 

14.8   NOTICES. All notices pertaining to or required by this CRADA shall be 
       in writing and shall be signed by an authorized representative and shall
       be delivered by hand or sent by certified mail, return receipt requested,
       with postage prepaid, to addresses indicated on the signature page for 
       each Party. Notices regarding the exercise of license options shall be 
       made pursuant to Article 8.2. Any Party may change such address by notice
       given to the other Party in the manner set forth above. 


                                       9

<PAGE>

14.9   INDEPENDENT CONTRACTORS. The relationship of the Parties to this CRADA is
       that of independent contractors and not as agents of each other or as 
       joint venturers or partners. Each Party shall maintain sole and exclusive
       control over its personnel and operations. Collaborator employees who 
       will be working at CDC facilities may be asked to sign a Guest Researcher
       or Special Volunteer Agreement appropriately modified in view of the 
       terms of this CRADA.

14.10  USE OF NAME OR ENDORSEMENTS. By entering into this Agreement, CDC does 
       not directly or indirectly endorse any product or service provided, or 
       to be provided, whether directly or indirectly related to either this 
       CRADA or to any patent license or other IP license or agreement which 
       implements this CRADA by its successors, assignees, or licensees. The 
       Collaborator shall not in any way state or imply that this CRADA is an 
       endorsement of any such product or service by the U.S. Government or any
       of its organizational units or employees.

14.11  EXCEPTIONS TO THIS CRADA. Any exceptions or modifications to this CRADA 
       that are agreed to by the Parties prior to their execution of this CRADA
       are set forth in Appendix D.

14.12  REASONABLE CONSENT. Whenever a Party's consent or permission is required 
       under this CRADA, such consent or permission shall not be unreasonably 
       withheld.

                            ARTICLE 15. DURATION OF AGREEMENT

15.1   DURATION. It is mutually recommended that this project cannot be rigidly 
       defined in advance and that the contemplated time periods for various 
       phases of the RP are only good faith guidelines subject to adjustment 
       by mutual agreement to fit circumstances as the RP proceeds. In no case 
       will the term of this CRADA extend beyond the term indicated in the RP 
       unless it is revised in accordance with Article 14.6.

15.2   SURVIVABILITY. The provisions of Articles 4.2, 5.2, 5.3, 6.1, Articles 
       7-9, 11.3, 11.5, 12.1, 13.3 and 14.10 shall survive the termination of 
       this CRADA.

CRADA #: CID-93-045-00

FOR THE CDC:                                  FOR THE COLLABORATOR:

/s/Joseph McDade   2/25/93                    /s/Paul J. Maddon     2/19/93
- ---------------------------------             --------------------------------
SIGNATURE          DATE                       SIGNATURE             DATE

Joseph   McDade                               Paul J. Maddon, M.D., Ph.D.
- ---------------------------------             --------------------------------
TYPED NAME                                    TYPED NAME  

Associate Director for Laboratory             Chairman and CEO
- ---------------------------------             --------------------------------
TITLE                                         TITLE



                                       10


<PAGE>

                                  APPENDIX A

               CENTERS FOR DISEASE CONTROL AND PREVENTION (CDC)
                                   AND THE
               AGENCY FOR TOXIC SUBSTANCES AND DISEASE REGISTRY

                             POLICY STATEMENT ON
               COOPERATIVE RESEARCH AND DEVELOPMENT AGREEMENTS
                    AND INTELLECTUAL PROPERTY LICENSING


This Statement sets forth the policies of the Centers for Disease Control and 
Prevention (CDC) and the Agency for Toxic Substances and Disease Registry 
(ATSDR) on various aspects of cooperative research and intellectual property 
licensing.  These policies apply to the negotiation of CDC and ATSDR 
Cooperative Research and Development Agreements (CRADAs).  License agreements 
for intellectual property rights to inventions developed under a CRADA or 
through the CDC and ATSDR intramural research programs, whether negotiated by 
CDC and ATSDR or by the National Technical Information Service on its 
behalf, will also incorporate these policies.  This statement may be revised 
as appropriate.

The Federal Technology Transfer Act of 1986 (FTTA, 15 U.S.C. at Section 
3710), Executive Order 12591 of April 10, 1987, orders Federal laboratories 
to assist universities and the private sector in broadening our national 
technology base by moving new knowledge from the research laboratory into the 
development of new products and processes.  While Federal patent law (35 
U.S.C. at Sections 200-212) authorizes the licensing of Government-owned 
patent rights, the FTTA seeks to facilitate technological collaboration at an 
earlier stage.  Thus the FTTA authorizes Federal laboratories to enter into 
CRADAs and to agree to grant intellectual property rights in advance to 
collaborators for inventions made in whole or part by Federal employees under 
the CRADA.  Besides assisting in the transfer of commercially useful 
technologies from Federal laboratories to the marketplace, CRADAs make 
outside resources more accessible to Federal investigators.

The CDC and ATSDR, agencies of the U.S. Public Health Service (PHS) within 
the Department of Health and Human Services (HHS), are lead Federal agencies 
for prevention and control of disease and disability in the U.S. and 
throughout the world.  The CDC and ATSDR primary goals are to prevent 
disease, illness, injuries, and disability before they occur, and to promote 
health.  Under the FTTA, 15 U.S.C. at Section 3710(a)2, technology transfer, 
consistent with mission responsibilities, is also a responsibility of each 
laboratory science and engineering professional.  To achieve its goals, CDC 
and ATSDR have developed an interdisciplinary research environment and 
service program that promotes and encourages the free exchange of ideas and 
information.

In order to safeguard the collegiality and integrity of, as well as public 
confidence in, the CDC/ATSDR research programs, the following research and 
technology transfer policies have been adopted.


1.  RESEARCH FREEDOM

The CDC and ATSDR investigators generally are free to choose the subject 
matter of their research, consistent with the mission of their 
Center/Institute/Office (CIO) and the research programs of their 
laboratories.  No CRADA or license agreement may contravene this freedom.



<PAGE>


2.  RESEARCH POLICY

The CDC and ATSDR research results generally are disseminated freely through 
publication in the scientific literature and presentations at public fora.  
Brief delays in the dissemination of research results may be permitted under 
a CRADA as necessary in order to file corresponding patent or other 
intellectual property applications.  The CDC and ATSDR consider the filing of 
such applications to be an important component of its research efforts.


3.  COOPERATIVE RESEARCH AND DEVELOPMENT UNDER A CRADA


As defined by the FTTA, 15 U.S.C. at Section 3710(d)(1), a CRADA means any 
agreement between one or more Federal laboratories and one or more 
non-Federal parties, under which the Government provides personnel, services, 
facilities, equipment or other resources (but not funds), and the non-Federal 
parties provide funds, personnel, services, facilities, equipment or other 
resources toward the conduct of specified research or development efforts.  
Cooperative research and development activities are intended to facilitate 
the transfer of federally funded research and development for use by State 
and local governments, universities, and the private sector, particularly 
small business.


4.  CDC AND ATSDR CRADAS FOR COOPERATIVE RESEARCH

As adopted by CDC and ATSDR, a CRADA is a standardized agreement intended to 
provide an appropriate legal framework for, and to expedite the approval of, 
cooperative research and development projects.  The use of CRADAs is 
encouraged for cooperative efforts because they permit CDC and ATSDR to 
accept, retain, and use funds, personnel, services, and property from 
collaborating parties and to provide personnel, services, and property to 
collaborating parties.  The CDC and ATSDR may permit its investigator to 
enter into CRADAs with collaborators who will make significant intellectual 
contributions to the research project undertaken or who will contribute 
essential research materials not otherwise reasonably available.  While CDC 
and ATSDR welcome contributions to its gift funds for research purposes, it 
does not view CRADAs as a general funding source or a mechanism for sponsored 
research.  This approach to implementing the FTTA has been chosen in order to 
maintain the public's confidence in CDC and ATSDR through maintaining an 
independence from reliance on industry funding.


5.  SELECTION OF COLLABORATORS UNDER A CRADA

Collaborators under a CRADA may be suggested by potential collaborators or by 
CDC and ATSDR investigators.  Generally, the decision to initiate the 
approval process for a CRADA is made by the involved CDC or ATSDR 
investigator and laboratory chief with the approval of Division and CIO 
directors.  Approval is based on scientific considerations and the desire for 
the public to benefit from the application by the private sector of 
particular CDC and ATSDR research.  For some cooperative projects, where the 
development and commercialization potential is more immediate relative to the 
basic research aspects, CDC and ATSDR may seek a collaborator(s) which has 
both scientific expertise and commercialization capabilities.  In certain 
areas of research, e.g. where the Government has the intellectual lead or 
where both scientific and commercialization capabilities are deemed essential 
at the outset, CDC and ATSDR may competitively seek a collaborator(s) through 
Federal Register notification.  The PHS has also developed policy guidelines 
for ensuring fairness of access to PHS laboratories such as CDC in the 
process of initiating and developing CRADAs.  Additionally, from time to 
time, CDC and ATSDR may sponsor industry collaboration fora to publicize 
opportunities for collaboration to a wide audience.


                                       2



<PAGE>


6.  PROPRIETARY OR CONFIDENTIAL INFORMATION AND MATERIALS

The CDC and ATSDR recognize that an effective collaborative research program 
may require the disclosure of proprietary information to CDC and ATSDR 
investigators.  Although agreements to maintain confidentiality are permitted 
under a CRADA, collaborators should limit their disclosure of proprietary 
information to the amount necessary to carry out the research plan of the 
CRADA.  The mutual exchange of confidential information, e.g. patient 
identification data, should be similarly limited.  The CDC and ATSDR also 
recognize that cooperative research may require the exchange of proprietary 
research materials.  Such materials may be used only for the purposes 
specified in the research plan set forth in the CRADA.  All parties to the 
CRADA will agree to keep CRADA research results confidential until they are 
published or presented at a scientific meeting.


7.  TREATMENT OF DATA AND RESEARCH PRODUCTS PRODUCED UNDER A CRADA

The CDC and ATSDR investigator and the collaborator will agree to exchange 
all data and research products developed in the course of research under a 
CRADA whether developed solely by CDC and ATSDR, jointly with the 
collaborator, or solely by the collaborator.  In general, tangible research 
products developed under a CRADA will be shared equally by the parties to the 
CRADA.  All parties to a CRADA will be free to utilize such data and research 
products for their own purposes.  Data and research products developed solely 
by the collaborator may be designated as proprietary by the collaborator 
when they are wholly separable from the data and research products developed 
jointly with CDC and ATSDR investigators.  However, except as may be afforded 
through intellectual property rights that require public disclosure of the 
protected subject matter (e.g. patents), the CDC and ATSDR will not agree to 
exclude others from utilizing or commercializing the data or research 
products developed solely by CDC and ATSDR investigators or jointly with the 
collaborator under a CRADA.  Thus, intellectual property which is not 
patented is not to be afforded trade secret status.


8.  OWNERSHIP OF AND LICENSING OF CDC INTELLECTUAL PROPERTY RIGHTS

Pursuant to the FTTA, 15 U.S.C. at Section 3710(b)(2), a Federal laboratory 
is authorized to own and license patent rights to inventions made in whole or 
part by its employees under a CRADA.  The term "invention" is defined at 
Section 3703(9) to mean any invention or discovery which is or may be 
patentable or otherwise protected under Title 35 or any novel variety of 
plant which is or may be protectable under the Plant Variety Protection Act 
(PVPA), 7 U.S.C. Section 2321 et seq.  The patent law, 35 U.S.C. Section 207, 
authorizes the ownership and licensing of intramural inventions.  Executive 
Order 12591 at Section 1(b)(1)(B) further authorizes the transfer of 
Government intellectual property rights.  Although the FTTA speaks broadly of 
the transfer of "technology", CDC and ATSDR do not have statutory authority 
to license (or to agree to limit dissemination) of technology developed in 
whole or part by their investigators under a CRADA unless a patent, PVPA 
certificate or other intellectual property application has been filed for 
that technology.  The CDC and ATSDR will retain the Government ownership 
interest in, but license rights to, all intellectual property rights to 
inventions developed solely by their investigators through intramural 
research or developed in whole or in part under a CRADA.


9.  GENERAL LICENSING POLICY

The CDC and ATSDR recognize that under the FTTA and the patent licensing law 
to which it refers, Congress and the President have chosen to utilize the 
patent system as the primary mechanism for transferring Government inventions 
to the private sector.  The importance of patents to commercialization in the 
biomedical field is further reflected by the Drug Price Competition and 
Patent Term Restoration Act of 1984 (Pub. L. 98-417).  A fundamental 
principle of the patent system is that the owner of a patent has a 
time-limited "right to exclude others from making, using, or selling the 
[patented] invention."  The reason for such a period of exclusivity is to 
encourage industry to invest the resources necessary to bring an invention 
from the discovery stage through subsequent development, clinical trials, 
regulatory approvals, and ultimately into commercial production.  The CDC and 
ATSDR accordingly are willing to grant exclusive commercialization licenses 
under their patent or other intellectual property rights in cases where 
substantial additional risks, time, and costs must be 

                                       3

<PAGE>

undertaken by a licensee prior to commercialization.  Under a CRADA, CDC and 
ATSDR are also willing to agree to grant exclusive commercialization licenses 
in advance to collaborators.  The CDC and ATSDR will attempt, however, to 
license their intramural inventions nonexclusively in cases where an 
invention reflects a relatively more advance stage in its commercial 
development, e.g. when a CDC and ATSDR investigator invents a patentable new 
therapeutic use for a known and FDA approved compound.

Federal laboratories are authorized to negotiate license agreements for 
Government-owned patent rights in intramural inventions pursuant to 35 U.S.C. 
Section 207.  Although Section 207 does not apply to intellectual property 
license agreements authorized by the FTTA for inventions made under a CRADA, 
CDC and ATSDR have adopted the following approach of Section 207 for all 
license agreements:

     Each Federal Agency [may] ... grant nonexclusive, exclusive or
     partially exclusive licenses under federally owned patent applications, 
     patents, or other forms of protection ... on such terms and conditions 
     ... as determined appropriate in the public interest.

The CDC and ATSDR have determined it to be appropriate and in the public 
interest to grant nonexclusive research licenses and either exclusive or 
nonexclusive commercialization licenses to HHS owned intellectual property 
rights according to the plan discussed below.

10.  GOVERNMENT INVENTION RIGHTS

For inventions developed wholly by CDC and ATSDR investigators or jointly 
with a collaborator under a CRADA, CDC and ATSDR are required by the FTTA at 
15 U.S.C. Section 3710(a)(b)(2) to retain at least a nonexclusive, 
irrevocable, paid-up license to practice the invention or to have the 
invention practiced throughout the world by or on behalf of the U.S. 
Government.  When granting exclusive or partially exclusive licenses to CDC 
and ATSDR intramural inventions, 35 U.S.C. Section 208, as implemented by 37 
C.F.R. Section 404.7(2)(i), required the reservation of similar Government 
rights.  The CDC and ATSDR will not assert an ownership right in inventions 
made solely by a collaborator under a CRADA, but will require the grant of a 
research license, as described below, to the Government for inventions made 
wholly by collaborator under a CRADA.

11.  RESEARCH LICENSES

The CDC and ATSDR will reserve the right under any CRADA and intellectual 
property license to grant nonexclusive licenses to make and to use such 
property, for purposes of research involving the invention itself and not for 
purposes of commercial manufacture or in lieu of purchase as a commercial 
product for use in other research.  The purpose of the research license is to 
facilitate basic academic research.  The CDC and ATSDR intends to consult 
with any involved commercialization licensee(s) before granting research 
licenses to commercial entities.  The grant of any research license hereunder 
does not permit CDC and ATSDR to grant any license to third parties to use 
the invention for any commercial purpose.

12.  COMMERCIALIZATION LICENSES

The CDC and ATSDR are willing to consider requests for nonexclusive or 
exclusive commercialization licenses to intellectual property rights to 
inventions developed under a CRADA or in the course of intramural research 
pursuant to applicable statutes and regulations.  Under a CRADA, CDC and ATSDR 
generally will grant a time-limited option to negotiate, in good faith, the 
terms of a license that fairly reflects the relative contributions of the 
parties, the risks incurred by the collaborator and the costs of subsequent 
research and development needed to bring the results of CRADA research to the 
marketplace.  The CDC and ATSDR consider the drafting of a model invention 
license to serve as the starting point for license negotiations.  It is 
contemplated further that such a model will reduce negotiations essentially 
to matters of execution fees, royalty rates, and minimum annual royalties.  
Royalty rates will be based on product sales and the rates conventionally 
granted in the field identified in the CRADA's research plan for inventions 
with reasonably similar commercial

                                       4


<PAGE>


potential.  Royalty rates generally will not exceed a rate [***]
               for exclusive commercialization licenses.  Contingent royalty 
schemes based on, e.g. patent issuance or nonissuance, and clauses treating 
the stacking of royalties or packaging of other inventions developed under 
the CRADA may be provided.  Exclusive licensees will be expected to reimburse 
CDC and ATSDR for intellectual property related expenses and may be permitted 
to offset such reimbursement against future product royalties.


13.  NONEXCLUSIVE COMMERCIALIZATION LICENSES

Unless a request for exclusive commercialization license is made under a 
CRADA or submitted for an intramural invention, CDC and ATSDR will attempt to 
license their inventions nonexclusively.  Such nonexclusive licenses 
generally will follow the guidelines of 37 C.F.R. Part 404.


14.  EXCLUSIVE COMMERCIALIZATION LICENSES

The CDC and ATSDR exclusive commercialization requires the submission by a 
prospective licensee of an acceptable development and commercialization plan 
as described by 35 U.S.C. Section 209(a) and subsequent, periodic reports on 
utilization of the invention as described by Section 209(f)(1).  All such 
plans and reports will be treated in confidence and as privileged from 
disclosure under the Freedom of Information Act.  Modification provisions as 
described by Section 209(f)(2-4) may apply.  In appropriate cases, CDC and 
ATSDR may also reserve the right to grant separate exclusive 
commercialization licenses in various fields of use.  The remaining 
provisions of 35 U.S.C. Section 200-212 will also apply to licenses to CDC 
and ATSDR intramural inventions.

The CDC and ATSDR also consider the following provisions for exclusive 
commercialization licenses to be necessary and appropriate in the public 
interest:

     (i)  the exclusive licensee must pledge its reasonable best efforts to 
     commercialize a licensed invention and the development and 
     commercialization plan mentioned above may serve as the measure of such 
     efforts;
     
     (ii)  the CDC and ATSDR shall have the right, after notice and 
     opportunity to cure, to terminate or render nonexclusive any license 
     granted: (1) if the licensee is not reasonably engaged in research, 
     development, clinical trials, manufacturing, marketing, sublicensing, 
     or other activities reasonably necessary to the expeditious commercial 
     dissemination of the licensed invention; or (2) when the licensee 
     cannot reasonably satisfy unmet health and safety needs;
     
     (iii)  in order to maximize the commercialization of the licensed 
     invention in other fields of use not utilized by the exclusive licensee 
     through ongoing development, manufacturing, or sublicensing, CDC and 
     ATSDR reserve the right to require the licensee to grant sublicenses to 
     responsible applicants, on reasonable terms, in such other fields of 
     use unless the licensee can reasonably demonstrate that such a 
     sublicense would be contrary to sound and reasonable business practice 
     and the granting of the sublicense would not materially increase the 
     availability to the public of the licensed invention; and
     
     (iv)  exclusive licensees to HHS inventions, whether developed under a 
     CRADA or through intramural research, must agree to not unreasonably 
     deny requests for sublicense or cross license rights from future CRADA 
     collaborators when the possibility of acquiring such derivative rights 
     is necessary in order to permit a proposed cooperative research project 
     with CDC and ATSDR to go forward, and the exclusive licensee has been 
     given a reasonable opportunity to join as a party to the proposed 
     CRADA.  The grant of any sublicense or cross license rights hereunder 
     does not grant future CRADA collaborators a license to use or CDC and 
     ATSDR the right to grant to future CRADA collaborators a license to use 
     any inventions of the instant CRADA for any commercial purpose.



                                       5

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15.  COMPLIANCE UNDER CRADAS WITH OTHER POLICIES

For research conducted pursuant to a CRADA, collaborators must agree to 
comply with PHS, CDC, and ATSDR policies and guidelines concerning, e.g. 
human subjects research, the use of research animals, recombinant DNA and 
other policy statements as may be promulgated from time to time.


16.  PRICING

HHS has the responsibility for funding basic biomedical research, for funding 
medical treatment through programs such as medicare and medicaid, for 
providing direct medical care, and more generally, for protecting the health 
and safety of the public.  Because of these responsibilities, and the public 
investment in the research that contributes to a product licensed under a 
CRADA, HHS has a concern that there be a reasonable relationship between the 
pricing of a licensed product, the public investment in the product, and the 
health and safety needs of the public.


17.  WAIVERS

The CDC and ATSDR will consider requests to modify any of the foregoing 
policies in special cases where public health exigencies or commercial 
situations warrant such a modification.  Modifications dealing with business 
terms such as royalties are not decided by the CDC and ATSDR investigators 
and should be discussed with the appropriate CDC and ATSDR technology 
management personnel.


18.  SPECIAL CONSIDERATION AND PREFERENCE UNDER A CRADA

The CDC and ATSDR will give special consideration to entering into CRADAs with 
small business firms and consortia involving small business firms; and will 
give preference to business units located in the United States which agree to 
manufacture substantially in the United States products which embody 
inventions developed in the course of research under CRADAs.

                                       6
<PAGE>

CRADA #: CID-93-045-00



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                             CRADA CID-93-045-00

                                  APPENDIX C

                       STAFFING AND MONETARY COMMITMENTS

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                                 [DIAGRAM]

                                 [DIAGRAM]

                                 Figure 1

<PAGE>

                                 [DIAGRAM]

                                 [DIAGRAM]

                                 Figure 2

<PAGE>
 
                                  LICENSE AGREEMENT

    AGREEMENT, effective March 1, 1989, between THE TRUSTEES OF COLUMBIA
UNIVERSITY IN THE CITY OF NEW YORK, a New York corporation ("Columbia") and
PROGENICS PHARMACEUTICALS, INC., a Delaware corporation ("Progenics").

1.  DEFINITIONS.

    a.   "Affiliate" shall mean any corporation, firm, partnership or other
entity which directly or indirectly owns, is owned by or is under common
ownership with a party to this Agreement to the extent of at least fifty percent
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.   "Licensed Columbia Patents" shall mean:

         (i)  the following patent applications and patents relating to soluble
              T4-based peptides and fragments thereof, intermediates or methods
              of producing them, or methods of, or compositions

<PAGE>

               using, them which are owned solely by Columbia and on which
               Richard Axel, Paul Maddon, Dan Littman, Leonard Chess, Robin
               Weiss, or Steven McDougal, or any combination thereof, are
               named as inventor or co-inventor:


               (A)    the patent applications listed in Appendix A hereto, all
                      divisions or continuations thereof, all patents issuing
                      therefrom and all reissues of all such patents;

               (B)    all patents and patent applications, whether filed before
                      or after the effective date of this Agreement, which
                      claim priority under 35 U.S.C. Section 119 or the benefit
                      of the filing date under 35 U.S.C. Section 120 of the
                      patent applications and patents of subparagraph (A), but
                      only to the extent of subject matter in such applications
                      and patents for which priority or benefit is claimed.

         (ii)  any claim in any patent application pending as of the effective
               date of this Agreement or any patent issuing

                                        - 2 -
<PAGE>


         therefrom relating to soluble T4-based peptides and fragments thereof,
         intermediates or methods of producing them, or methods of, or
         compositions using, them which is owned in part by Columbia and on
         which Richard Axel or Paul Maddon, or both, are named as inventor or
         co-inventor, and any claim in any patent application, or any patent
         issuing therefrom, whether filed before or after the effective date of
         this Agreement, which claims priority under 35 U.S.C. Section 119 or
         the benefit of the filing date under 35 U.S.C. Section 120 of any such
         patent application or patent, but only to the extent of subject matter
         in such application or patent for which priority or benefit is
         claimed, to the extent that such claim is:

         (A)   directed to a soluble T4-based peptide or fragment thereof
               which contains an amino acid sequence identical to the amino
               acid sequence 3-94, which is shown in Figure 6A of PCT
               International Publication No. W088/01304, published February
               25, 1988 or an amino acid sequence

                                        - 3 -

<PAGE>

               identical to that amino acid sequence, except that at position
               3 lysine replaces asparagine, and/or at position 64 arginine
               replaces tryptophan; or

         (B)   broadly directed to methods of making the soluble T4-based
               peptide or fragment thereof of subparagraph (A) in transformed
               hosts, but not otherwise;

         but excluding any claim directed to a soluble T4-based peptide which
         has an amino acid sequence which is identical to any of the following
         amino acid sequences which are shown in Figure 6A of PCT International
         Publication No. W088/01304: (i) the amino acid sequence 3-185; (ii)
         the amino acid sequence 3-185 fused to the amino acid sequence
         353-371, or (iii) the amino acid sequence 3-106 fused to the amino
         acid sequence 353-371, or an amino acid sequence which is identical to
         any such amino acid sequence, except that at position 3 lysine
         replaces asparagine.

    c.   "Products" shall mean any product (i) the manufacture, use or sale of
which would, but for the

                                        - 4 -

<PAGE>

license granted herein, infringe a claim of an existing Licensed Columbia Patent
or (ii) that is described by a claim of a pending patent application within
Licensed Columbia Patents.

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                                      [***]


    2.   LICENSE GRANT.

         a.    Columbia grants to Progenics and its Affiliates, upon and
subject to all the terms and conditions of this Agreement, a worldwide,
coexclusive license under the Licensed Columbia Patents to manufacture, have
manufactured, use and sell Products, provided, however, that Columbia shall
grant no more than three other coexclusive licenses which shall not be granted
more than 90 days after the effective date of this Agreement.  Columbia will
inform Progenics of the names of each coexclusive licensee.

         b.    Progenics may not grant any sublicenses under this Agreement.

         c.    All rights granted by Columbia to Progenics under this
Agreement are subject to the requirements, to the extent applicable, of 35
U.S.C. Sections 200 ET SEQ. and implementing regulations.  If Columbia is
required to grant licenses, in addition to the three other coexclusive licenses
provided for in Section 2(a), pursuant to the statutory and regulatory
requirements referred to in this Section 2(c), or if the license granted to
Progenics under this Agreement is otherwise modified or limited by the U.S.
Government pursuant to such requirements, Columbia and Progenics shall negotiate
in good faith a reduction of the license fees and royalties payable hereunder
and such

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<PAGE>

other amendments of this Agreement as may be appropriate under the
circumstances.

    3.   LICENSE FEE AND ROYALTIES.

         a.    In consideration of the license granted under Section 2(a) of
this Agreement, Progenics shall pay to Columbia:

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    4.   PATENT PROSECUTION.  Progenics shall reimburse Columbia within thirty
days of the effective date of this Agreement for a proportionate share of all
expenses incurred to date and shall pay a proportionate share of all expenses
incurred during the term of this Agreement, for filing, prosecuting and
maintaining licensed columbia patents.  Progenics, proportionate share shall be
one fourth of such expenses if there are three other coexclusive licenses, one
third of such expenses if there are two other coexclusive licensees, one half of
such expenses if there is one other coexclusive licensee, and all of such
expenses if there is no other coexclusive licensee of Licensed Columbia Patents.
The preparation, filing, prosecution and maintenance of the Licensed Columbia
Patents will be conducted by Columbia in Columbia's name, by counsel selected by
Columbia in countries designated by Columbia.  Columbia shall keep Progenics
fully informed concerning Licensed Columbia Patents, and shall promptly provide
to Progenics copies of all correspondence relating to Licensed Columbia Patents
from the patent offices in those countries in which Licensed Columbia Patents
are filed as well as copies of all responses thereto.  So long as Progenics
timely provides comments to Columbia concerning the preparation of responses to
Office Actions, Columbia's counsel shall give due consideration to such
comments.


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    5.   REPORTS AND PAYMENTS.

         a.    On or before the last business day of February, May, August and
November of each year of this Agreement, Progenics shall submit to Columbia a
written report with respect to the preceding calendar quarter (the "Payment
Report") stating:

               (i)    Net Sales made by Progenics and any Affiliate during such
quarter for Products; and

               (ii)   A calculation under Section 3 of the amount due to
Columbia.

         b.    Simultaneously with the submission of each Payment Report,
Progenics shall make payment to Columbia of the amount due for the calendar
quarter covered by the Payment Report.

         c.    Progenics shall maintain at its principal office usual books of
account and records showing its actions under this Agreement.  Upon reasonable
notice, such books and records shall be open to inspection and copying at
Columbia's expense, during usual business hours, by an independent certified
public accountant to whom Progenics has no reasonable objection, for two years
after the calendar quarter to which they pertain, for purposes of verifying the
accuracy of the amounts paid by Progenics under this Agreement.

         d.    Any tax paid or required to be withheld by Progenics on account
of royalties payable to Columbia under


                                        - 9 -

<PAGE>

this License Agreement shall be deducted from the amount of royalties otherwise
due.  Progenics shall secure and send to Columbia proof of any such taxes
withheld and paid by Progenics for the benefit of Columbia.

         e.    All royalties due under this Agreement shall be payable in U.S.
dollars.  If governmental regulations prevent remittances from a foreign country
with respect to sales made in that country, the obligation of Progenics to pay
royalties on sales in that country shall be suspended until such remittances are
possible.  Columbia shall have the right, upon giving written notice to
Progenics, to receive payment in that country in local currency.

         f.    Monetary conversions from the currency of a foreign country in
which Products are sold into United States currency shall be made at the
official exchange rate in force in that country for financial transactions on
the last business day of the calendar quarter for which the royalties are being
paid.  If there is no such official exchange rate, the conversion shall be made
at the rate for such remittances on that date as certified by Citibank, N.A.,
New York, New York, U.S.A.

    6.   USE FOR RESEARCH PURPOSES OF LICENSES GRANTED.  Columbia reserves the
right to use the Licensed Columbia Patents solely for academic research purposes
and to permit other entities or individuals to use the same




                                        - 10 -

<PAGE>

solely for academic research purposes provided such other entities or
individuals agree in writing to use the same for academic research purposes and
not to provide the same to other entities or individuals

    7.   BEST EFFORTS.

         a.    Progenics shall use its reasonable best efforts to develop and
market Products for commercial sale and distribution throughout the world.  
To such end, Progenics shall use its reasonable best efforts to achieve the
following objectives within the following time periods measured from the
effective date of this Agreement:


                                      [***]


         b.    Failure to achieve these objectives shall result in Columbia 
having the option to terminate the license granted hereunder, subject to 
Progenics' right to achieve the missed objective within 60 days of receipt of 
written notice of termination from Columbia.  Columbia shall not unreasonably 
withhold its consent to any revision in the preceding schedule requested in 
writing by Progenics and supported by evidence of technical difficulties or 
delays in the clinical studies or regulatory process that


*** Confidential Treatment Requested

                                        - 11 -

<PAGE>


could not have been reasonably avoided.

    8.   INFRINGEMENT OF LICENSED COLUMBIA PATENTS.

         a.    Columbia will protect the Licensed Columbia Patents from
infringement and prosecute infringers at its own expense when in its sole
judgment such action may be reasonably necessary, proper and justified.

         b.    Progenics shall notify Columbia if it becomes aware of any
infringement of a claim of a Licensed Columbia Patent by a third party selling
products in competition with Progenics or its Affiliates.

         c     In the event Columbia shall initiate or carry on legal
proceedings to enforce any Licensed Columbia Patent against an alleged
infringer, Progenics shall use its reasonable best efforts to fully cooperate
with and shall supply all assistance reasonably requested by Columbia.  Columbia
shall have sole control of that proceeding and shall bear the reasonable
expenses incurred by Progenics in providing such assistance and cooperation as
is requested pursuant to this paragraph.

         d.    If Columbia does not initiate and use reasonable efforts to 
carry on such a legal proceeding or otherwise cause the infringement of 
claims of Licensed Columbia Patents to cease within one year of receipt of 
notice from Progenics of the infringement, Progenics shall be entitled 
thereafter to pay license fees and royalties due to Columbia into an 
interest-bearing, escrow account.




                                        - 12 -

<PAGE>

As soon as Columbia initiates and uses reasonable efforts to carry on such a 
legal proceeding or otherwise causes the infringement to cease, whichever is 
earlier, Progenics shall resume payments directly to Columbia if Progenics 
had previously paid license fees and royalties into such an escrow account 
and shall further pay to Columbia all monies, including interest, in such 
escrow account.  If Columbia fails to initiate and carry on such a legal 
proceeding or to otherwise cause such infringement to cease, Progenics shall 
be entitled to recover from such escrow account all monies, including 
interest, which have been in such escrow account for more than two years and 
shall have no further obligation to Columbia with respect to such monies.


    9.   REPRESENTATIONS AND WARRANTIES. Columbia represents and warrants that,
to the best of its knowledge, it has good title to the Licensed Columbia Patents
and that it has the right to grant the license granted to Progenics hereunder
and that it has taken all action necessary under the statute and regulations
referred to in Section 2(c) above in order to vest in Columbia such title to the
Licensed Columbia Patents and in order to grant such license.  Nothing in this
Agreement shall be construed as a warranty or representation by either party as
to the validity of any Licensed Columbia Patent. Nothing in this agreement shall
be construed as a warranty or


                                        - 13 -

<PAGE>

representation by either party that anything made, used, sold or otherwise
disposed of under any license granted under this Agreement is or will be free
from infringement of domestic or foreign patents of other parties.  Nothing in
this Agreement shall be construed as a license under any other patent or patent
application owned in whole or in part by Columbia, including specifically U.S.
Patent Number 4,399,216 related U.S. and foreign patents and patent applications
under which a separate license is required.

    10.  PROHIBITION AGAINST USE OF NAME.  Progenics will not use the name,
insignia or symbols of Columbia, its faculties or departments, or any variation
or combination thereof, or the name of any trustee, faculty member, other
employee or student of Columbia for any purpose whatsoever without Columbia's
prior written consent.

    11.  COMPLIANCE WITH GOVERNMENTAL OBLIGATIONS.

         a.    Notwithstanding any provisions in this Agreement, Columbia
disclaims any obligations or liabilities arising under the license provisions of
this Agreement if Progenics is charged in a governmental action for not
complying with or fails to comply with governmental regulations in the course of
taking effective steps to bring any Product to a point of practical application.

         b.    Progenics shall comply upon reasonable notice from Columbia
with all lawful governmental requirements directed to either Columbia or
Progenics and


                                        - 14 -

<PAGE>

provide all information and assistance necessary to comply with the governmental
requirements.

         c.    Progenics shall conduct its research, development, and
marketing activities under this Agreement in compliance with all government
regulations in force and effect including, but not limited to, Federal, state
and municipal legislation.

    12.  INDEMNITY AND INSURANCE.

         a.    Progenics will indemnify and hold Columbia and the Howard
Hughes Medical Institute harmless against any and all actions, suits, claims,
demands, prosecutions, liabilities, costs and expenses (including reasonable
attorneys' fees) based on or arising out of the manufacture, packaging, use, or
sale of Products by Progenics and its Affiliates, even if altered for use for a
purpose not intended, or use of Licensed Columbia Patents by Progenics or its
Affiliates, or its (or their) customers and any representation made or warranty
given by Progenics or, its Affiliates, with respect to Products, provided
Columbia or the Howard Hughes Medical Institute gives prompt written notice to
Progenics of any claim against it for which indemnification is sought and
promptly discloses to Progenics a true copy of any summons or other process,
pleading or notice issued in any lawsuit or other proceeding to assert such
claim and further provided that Progenics has the right to control


                                        - 15 -

<PAGE>

the investigation, trial and defense of such lawsuit or other proceeding
(including all settlement negotiations) and any appeal arising therefrom and to
retain attorneys of its choosing.

         b.    Progenics shall maintain, during the term of this Agreement,
comprehensive general liability insurance, including product  liability
insurance, with reputable and financially secure insurance carriers and in a
form reasonably acceptable to Columbia to cover the activities of Progenics and
its Affiliates for minimum limits of [***] combined single limit for bodily
injury and property damage per occurrence and in the aggregate.  Such insurance
shall include Columbia, its trustees, officers, and employees as additional
insureds.  Prior to any administration of a Product to a human being, Progenics
shall furnish to Columbia a certificate of insurance evidencing such coverage.
Progenics shall provide to Columbia thirty days prior written notice of any
cancellation or material change in such insurance.

    Progenics' insurance shall be primary coverage; any insurance Columbia may
purchase shall be excess and noncontributory.  Such insurance shall be written
to cover claims made during or after the expiration of this Agreement.

    Progenics shall have the option of self insuring for such coverage, on the
condition that it provides



                                        - 16 -


*** Confidential Treatment Requested
<PAGE>

Columbia, before any Product is administered to a human being, with an audited
financial statement that evidences its ability to self insure for such amounts.

    Progenics shall at all times comply with all statutory workers'
compensation and employers' liability requirements covering its employees with
respect to activities performed under this Agreement.

    Progenics, no later than each anniversary of the effective date of this 
Agreement, shall provide to Columbia written assurance that Progenics is in 
compliance with its obligations under this Section 12.  Such assurance shall 
be sent by certified mail (return receipt requested), postage prepaid to:

         Columbia University
         Risk Management Office
         225 Broadway
         New York, New York 10007

    13.  MARKING.  Prior to the issuance of patents, Progenics will, as
appropriate, mark Products made, sold, or otherwise disposed of by it under the
license granted in this Agreement with the words "Patent Pending", and following
the issuance of one or more patents, with the numbers of such patents.

    14.  BREACH AND CURE.

         a. In addition to applicable legal standards, Progenics shall be
considered to be in material


                                        - 17 -

<PAGE>

breach of this Agreement for (i) failure to pay fully and promptly amounts due
pursuant to Section 3 and payable pursuant to Section 5, (ii) failure to pay
patent prosecution expenses pursuant to Section 4, (iii) failure to comply with
governmental requests directed to Columbia or Progenics pursuant to Section
11(b), or (iv) failure to maintain the required insurance pursuant to Section
12.

         b.    Either party shall have the right to cure its material breach.
The cure shall be effected within a reasonable period of time but in no event
later than sixty days after notice of breach given by the non-breaching party.

    15.  TERM OF AGREEMENT.

         a.    This Agreement and the royalty obligations incident thereto
shall be effective as of the date first set forth above and shall continue in
full force and effect until its expiration or termination in accordance with
this Section 15.

         b.    Unless terminated earlier under any other provision of this
Agreement, the Agreement shall expire upon the expiration, lapse or invalidation
of the last Licensed Columbia Patent to expire, lapse or be invalidated.
Following termination of this Agreement pursuant to this Section 15(b),
Progenics shall have the right to manufacture, have manufactured, use and sell
Products without further obligations to Columbia.


                                        - 18 -

<PAGE>

         c. This Agreement may be terminated by Columbia (i) upon sixty days'
written notice to Progenics if Columbia elects to terminate in accordance with
Section 7(b), (ii) upon thirty days' written notice to Progenics for Progenics's
material breach of the Agreement and Progenics's failure to cure such material
breach in accordance with Section 14(b), or (iii) should Progenics commit any
act of bankruptcy, become insolvent, file a petition under any bankruptcy or
insolvency act or have any such petition filed against it.  Following
termination of this Agreement pursuant to this Section 15(c), Progenics shall
have the right to sell off existing inventory subject to the obligations of this
Agreement.

         d.     Progenics may terminate this Agreement at any time upon 90
days prior written notice.

    16.  NOTICES.  Any notice required or permitted to be given under this
Agreement shall be sufficient if sent by certified mail (return receipt
requested), postage prepaid,

if to Columbia, to:               Office of Science and 
                                    Technology Development
                                  Columbia University 
                                  411 Low Memorial Library
                                  New York, New York 10027


copy to:                          General Counsel 
                                  Columbia University 
                                  110 Low Memorial Library 
                                  New York, New York 10027


                                        - 19 -

<PAGE>


if to Progenics, to:              Mr. Terrence C. Burnham 
                                  Progenics Pharmaceuticals, Inc.
                                  Old Saw Mill River Road
                                  Tarryton, New York 10591

copy to:                          Mackler, Cooper & Gibbs 
                                  1120 Vermont Avenue, N.W. 
                                  Suite 600
                                  Washington, D.C. 20005

or to such other address as a party may specify by notice hereunder.

    17.  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 commencing two years after the effective date of this Agreement,
Progenics may assign this Agreement to any corporation with which it may merge
or consolidate, or to which it may transfer all or substantially all of its
assets to which this Agreement relates with Columbia's written consent, such
consent not to be unreasonably withheld.

    18.  ENTIRE AGREEMENT.  This Agreement constitutes the entire agreement
between the parties relating to the subject matter hereof and supersedes all
previous writings and understandings.  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


                                        - 20 -

<PAGE>

parties.  This Agreement may only be amended by a written instrument signed by
Progenics and Columbia, specifically referring to and executed in the same
manner as this Agreement, and no such amendment shall be entered into without
the written consent of all other licensees under Licensed Columbia Patents, such
consent not to be unreasonably withheld.

    19.  GOVERNING LAW.  This Agreement shall be governed by New York law
applicable to agreements made and to be performed in New York.

    IN WITNESS THEREOF, Columbia and Progenics have caused this Agreement to be
executed by their duly authorized representatives as of the day and year first
written above.

                                       THE TRUSTEES OF COLUMBIA UNIVERSITY
                                       IN THE CITY OF NEW YORK


                                       By  /s/ Jack M. Granowitz
                                          --------------------------------------
                                          Director, Office of Science
                                           and Technology Development

                                       PROGENICS PHARMACEUTICALS, INC.


                                       By /s/ Gerard M. Housey
                                          --------------------------------------
                                          Gerard M. Housey, Ph.D.
                                          President


                                        - 21 -

<PAGE>


                                      APPENDIX A

                              LICENSED COLUMBIA PATENTS

U.S. Serial no. 898,587, filed August 21, 1986

U.S. Serial no. 114,244, filed October 23, 1987

Australian Appln. No.  78792/87, filed April 13, 1988, based upon PCT
International Appln. No. PCT/US87/02050, filed August 20, 1987.

Canadian Appln. No. 544,986, filed August 20, 1987

Danish Appln. No. 2172/88, filed April 21, 1988, based upon PCT International
Appln. No. PCT/US87/02050, filed August 20, 1987.

European Appln. No. 87 905 848.5, filed April 21, 1988, based upon PCT
International Appln. No. PCT/US87/02050, filed August 20, 1987.

Japanese Appln. No. 505271/87, filed April 21, 1988, based upon PCT
International Appln. No. PCT/US87/02050, filed August 20, 1987.


<PAGE>

                                     [LETTERHEAD]

                                    March 1, 1989


Director
Office of Science and
  Technology Development
Columbia University
411 Low Memorial Library
New York, New York 10027



         Progenics Pharmaceuticals - Columbia
         License Agreement (March 1, 1989)
         Soluble T.-Based Peptides
         ------------------------------------


Dear Sir:

    This concerns the above-identified License Agreement.

    THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK ("Columbia") 
and PROGENICS PHARMACEUTICALS, INC. ("Progenics") agree to and understand 
that the above-identified License Agreement, now in force and executed on 
even date herewith, shall be interpreted consistently with the following:

    1.   Columbia shall not, pursuant to Section 7(b), terminate the license
granted to Progenics under the March 1, 1989 License Agreement notwithstanding
Progenics' failure to achieve the objectives specified in Section 7(a), within
the corresponding time periods there specified, provided that:

    (i)  Progenics makes the corresponding licensee fee payments set forth in
Section 3(a)(i) no later than the last day of each such time period; and

    (ii) Progenics, as of the date of each such payment, demonstrates that it
has used, and is continuing to use, reasonable efforts to develop and market
Products for commercial sale and distribution.

<PAGE>

    2.   In the last sentence of Section 17 of the License Agreement, the
phrase "such consent not to be unreasonably withheld" shall be interpreted to
mean that Columbia shall not withhold its consent in the event that Progenics
merges or consolidates with, or sells all or substantially all of its assets to,
a major pharmaceutical company of recognized standing in the industry.


                                       Sincerely,


                                       Progenics Pharmaceuticals, Inc.

                                       By: /s/ Gerard M. Housey
                                          ------------------------------
                                           Gerard M. Housey
                                           President



Dated: March 1, 1989

The foregoing is in accordance with
Columbia's interpretation of the
License Agreement now in force, and
executed on even date herewith,
between Columbia and Progenics

THE TRUSTEES OF COLUMBIA UNIVERSITY
 IN THE CITY OF NEW YORK


By: /s/ Jack M. Granowitz
   -----------------------------------
   Director, Office of Science and
   Technology Development



<PAGE>

                                   October 22, 1996

Paul A. Madden, M.D., Ph.D.
Chairman and CEO
Progenics Pharmaceuticals, Inc.
Old Saw Mill River Road
Tarrytown, New York 10591


Dear Paul:

Re: Columbia-Progenics CD4 license agreement

Columbia and Progenics have agreed to supersede the existing coexclusive 
license agreement between THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF 
NEW YORK ("Columbia") and PROGENICS PHARMACEUTICALS, INC., ("Progenics") of 
March 1, 1989 as amended by the letter agreement of March 1, 1989 
(hereinafter the, "Coexclusive Agreement) with a new exclusive license 
agreement (hereinafter the "Exclusive Agreement").  The Exclusive Agreement 
will include the terms in this letter agreement (hereinafter the, "Letter 
Agreement of October 22, 1996." Columbia and Progenics will work diligently 
and in good faith to draft, finalize and sign the Exclusive Agreement within 
90 days of this Letter Agreement of October 22, 1996.  This Letter Agreement 
of October 22, 1996 shall become binding and effective upon its execution by 
Columbia and Progenics, shall supersede the Coexclusive Agreement, and shall, 
until the execution of the Exclusive Agreement by Columbia and Progenics, 
govern the relationship of Columbia and Progenics as to the subject matter 
hereof.

1.  Scope of Grant.

a.  Subject to any residual rights of the third parties under previous 
agreements with Columbia to sell inventory that was made prior to termination 
of those agreements, Columbia grants to Progenics and its Affiliates, upon 
and subject to all the terms and conditions of this Letter Agreement of 
October 22, 1996, a world-wide, exclusive license, with the right to 
sublicense, under the Licensed Columbia Patents set forth in Exhibit C to 
manufacture, have manufactured, use and sell Products as defined herein. The 
patent rights relating to CD4 that are jointly owned by Columbia with 
SmithKline Beecham will be included in Licensed Columbia Patents to the 
extent of Columbia's right therein.

"Products" shall mean any product (i) the manufacture, use or sale of which
would, but for the license granted herein, infringe a claim of an existing
Licensed Columbia Patent, or (ii) that is described in a claim of a pending
patent application within Licensed Columbia Patents, or (iii) that uses, or is
derived from the use of, Licensed Technical Information.

"Licensed Technical Information" shall mean all information and materials
(including any chemical


                                          1

<PAGE>

compound or substance, biological cell, or component thereof) owned by 
Columbia, solely or jointly with Progenics, and related to soluble T-4 based 
peptides which is not covered by Licensed Columbia Patents.

b.  Columbia grants to Progenics a world-wide exclusive license, with the right
to sublicense, for commercial purposes to the [***].  There exists no other 
license (except for any residual rights of the third parties under previous 
agreements with Columbia to sell inventory that was made prior to termination 
of those agreements) and Columbia will not grant licenses in the future for 
commercial development of the [***] though Columbia does not warrant that no 
commercial entity has received [***].

                                      [***]

*** Confidential Treatment Requested


                                          2

<PAGE>

                                      [***]


4.  Annual Research and Development Plans.

Progenics has provided Columbia with an annual Research and Development Plans
for each Defined Product which is attached as Exhibit D.  The research and
development plans for each Defined Product shall contain at least the following:

a.  Resources previously expended and to be expended during the next calendar
year for each Defined Product.

b.  Current status and progress expected to be made during the next calender
year with regard to each Defined Product,

c.  A list of patents and patent applications owned or controlled by Progenics
with respect to each Defined Product,

d.  A description of at least one specific product embodying each Defined
Product that is under development by Progenics.

Beginning in 1997, Progenics shall provide an updated annual research and
development plan for each Defined Product at least 90 days prior to the
beginning of the next calender year.

If Progenics fails to timely provide, or diligently pursue, an annual research
and development plan on a specific Defined Product, then that Defined Product
shall cease to be a Defined Product.  Columbia shall provide Progenics with 30
days notice when Columbia believes a product is no longer a Defined Product.  If
there is a dispute whether a product continues to be a Defined Product, then the
parties shall meet and negotiate in good faith in an attempt to resolve the
dispute.

5.  A new schedule of payments by Progenics to Columbia shall be adopted as
follows:


*** Confidential Treatment Requested

                                          3

<PAGE>

                                      [***]



g.  In addition to the foregoing, Progenics will pay:


                                      [***]


h.  Failure to make the payments described in this Section 5 or Section 6 of 
this Letter Agreement of October 22, 1996 would entitle Columbia at its sole 
option do any of the following:

    I.        terminate the Exclusive Agreement in whole or in part, or

    ii.       convert one or more Defined Products to a non-exclusive license,

6.  Patent Expenses and Infringement.

a.  Progenics will reimburse Columbia for all reasonable patent expenses from
December 21,


*** Confidential Treatment Requested

                                          4

<PAGE>

1995 forward.  Progenics will remain responsible for a pro rata share of patent
expenses prior to that date depending on how many parties had coexclusive
licenses.  If Columbia so requests, Progenics will make such reimbursement
directly to Columbia's patent counsel and Progenics will accept invoices
directly from Columbia's patent counsel.

b.  Columbia shall have the first right to sue infringers.  In the event that
Columbia shall not commence an action within 90 days of receipt from Progenics
of evidence establishing a prima facie case of infringement, then Progenics
shall have the right to commence an action against the infringer at Progenics'
expense.  In the event that Progenics finances the suit, then Progenics may
credit litigation expenses against the running royalty owed to Columbia up to
[***] of the royalty with respect to the relevant product or Defined Product. In
the event of an award or settlement, Progenics shall first reimburse itself for
its expenses and Columbia on a pro rata basis for any amounts withheld from or
paid by Columbia.  Any excess shall be divided [***] to Progenics and [***] to
Columbia, such reimbursement of Progenics and Columbia to be on a  pro rata
basis.  Section 8(d) of the Coexclusive Agreement is hereby deleted.

7.  Best Efforts.

    Progenics shall have obligations identical to those in Section 7(ii),(iii)
and (iv) of the Coexclusive Agreement except that the dates shall be revised to
read as follows:

                                      [***]


8.  Except as modified by this Letter Agreement of October 22, 1996,
substantially all of the terms in the Coexclusive Agreement apply to, and are
hereby incorporated into, this Letter Agreement of October 22, 1996.

If Progenics is in agreement with the above please execute both copies of this
Letter Agreement of October 22, 1996, and return them to me.  I shall have it
executed here at Columbia and return one fully executed copy to you.


                             Sincerely yours,



                             /s/ SCOT G. HAMILTON

                             Scot G. Hamilton
                             Director, Health Sciences
                             Columbia Innovation Enterprise

Agreed to:


*** Confidential Treatment Requested


                                          5

<PAGE>

PROGENICS PHARMACEUTICALS, INC.



By:  /s/ PAUL J. MADDON
   -----------------------------------
         Paul J. Maddon, M.D., Ph.D.
         Chairman and CEO


THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK



By:  /s/ JACK M. GRANOWITZ
   -----------------------------------
         Jack M. Granowitz
         Executive Director
         Columbia Innovation Enterprise





                                          6

<PAGE>

EXHIBIT A

                                      [***]

*** Confidential Treatment Requested

                                          7

<PAGE>


                                      [***]

*** Confidential Treatment Requested

                                          8

<PAGE>

EXHIBIT B.


                                      [***]



*** Confidential Treatment Requested
 

                                          9

<PAGE>

                                      EXHIBIT C

                                      [***]



*** Confidential Treatment Requested

                                         -1-

<PAGE>

                                      EXHIBIT C



                                      [***]

*** Confidential Treatment Requested


                                         -2-



<PAGE>

              EXHIBIT C

                                      [***]



*** Confidential Treatment Requested




                                         -3-

<PAGE>

              EXHIBIT C

                                      [***]



*** Confidential Treatment Requested


                                         -4-

<PAGE>

              EXHIBIT C

                                      [***]



*** Confidential Treatment Requested





                                         -5-

<PAGE>

CONFIDENTIAL                 EXHIBIT D
Progenics Pharmaceuticals, Inc.
9 October, 1996



                                      [***]





*** Confidential Treatment Requested

<PAGE>

                                 EXHIBIT D CONTINUED


                                      [***]


*** Confidential Treatment Requested


<PAGE>



                                      [***]




*** Confidential Treatment Requested


<PAGE>

                                      [***]




*** Confidential Treatment Requested


<PAGE>

                                                              Exhibit 10.19


                             LICENSE AGREEMENT
                                NO. W 960625



              ANTIGENIC COMPOSITIONS AND METHODS FOR USING SAME




                         PROGENICS PHARMACEUTICALS


                                    AND


                              THE REGENTS OF THE
                           UNIVERSITY OF CALIFORNIA



<PAGE>


                                LICENSE AGREEMENT
                                   No. W 960625
                                TABLE OF CONTENTS



ARTICLE                                                            PAGE NUMBER
- -------                                                            -----------


RECITALS ...............................................................1

     1. DEFINITIONS ....................................................1
     2. GRANT ..........................................................2
     3. SUBLICENSES ....................................................3
     4. CONSIDERATION ..................................................3
     5. ROYALTIES ......................................................3
     6. DILIGENCE ......................................................4
     7. PATENT FILING, PROSECUTION AND MAINTENANCE .....................5
     8. PATENT INFRINGEMENT ............................................6
     9. PROGRESS AND ROYALTY REPORTS ...................................7
    10. BOOKS AND RECORDS ..............................................7
    11. LIFE OF THE AGREEMENT ..........................................7
    12. TERMINATION BY THE REGENTS .....................................8
    13. TERMINATION BY PROGENICS .......................................8
    14. DISPOSITION OF LICENSED PRODUCTS ON HAND UPON TERMINATION ......8
    15. PATENT MARKING .................................................9
    16. USE OF NAMES AND TRADEMARKS ....................................9
    17. LIMITED WARRANTY ...............................................9
    18. INDEMNIFICATION ...............................................10
    19. NOTICES .......................................................10
    20. ASSIGNABILITY .................................................11
    21. LATE PAYMENTS .................................................11
    22. WAIVER ........................................................11
    23. FAILURE TO PERFORM ............................................11
    24. GOVERNING LAWS ................................................11
    25. GOVERNMENT APPROVAL OR REGISTRATION ...........................12
    26. EXPORT CONTROL LAWS ...........................................12
    27. PREFERENCE FOR UNITED STATES INDUSTRY .........................12
    28. FORCE MAJEURE .................................................12
    29. ARBITRATION ...................................................12
    30. CONFIDENTIALITY ...............................................12
    31. MISCELLANEOUS .................................................13


<PAGE>



                                     LICENSE AGREEMENT
                                        No. W 960625


This Agreement is made and is effective this 25th day of June 1996, (the 
"Effective Date") between THE REGENTS OF THE UNIVERSITY OF CALIFORNIA ("The 
Regents"), a California corporation having its corporate offices located at 
300 Lakeside Drive, 22nd Floor, Oakland, California 94612-3550, acting 
through its offices located at Box 951525, 405 Hilgard Avenue, Los Angeles, 
California 90095-1525, and PROGENICS PHARMACEUTICALS, INC. ("Progenics"), a 
corporation having a principal place of business at Old Saw Mill River Road, 
Tarrytown, NY 10591.

RECITALS

WHEREAS, a certain invention (the "Invention"), generally characterized as 
"Antigenic Compositions and Methods for Using Same" (U.S. Case No. 
92-078-01), was made in the course of research at the University of 
California, Los Angeles by Reiko Irie, Tadashi Tai, Donald L. Morton, James 
C. Paulson and Leslie Cahan, and is covered by Regents' Patent Rights as 
defined below;

WHEREAS, the Invention was developed with United States Government funds, and 
The Regents granted a royalty-free nonexclusive license to the United States 
Government on January 18, 1983, as required under 35 U.S.C. Section 201-212;

WHEREAS, Progenics is a "small business firm" as defined in 15 U.S.C. 
Section 42; and

WHEREAS, The Regents wishes that Regents' Patent Rights be developed and 
utilized to the fullest extent so that the benefits can be enjoyed by the 
general public.

The parties agree as follows:

1. DEFINITIONS

    1.1    "Regents' Patent Rights" means patent rights to any subject matter
           claimed in or covered by the patent entitled "Antigenic Compositions
           and Methods for Using Same", U.S. patent no. 4,557,931 (filed
           December 10, 1985), assigned to The Regents (UCLA Case No.
           LA92-078-01), including reissues and reexaminations.

   1.2     "Licensed Product" means any article, composition, apparatus,
           substance, chemical, or any other material covered by Regents'
           Patent Rights or whose manufacture, use or sale would constitute an
           infringement of any claim within Regents' Patent Rights, or any
           service, article, composition, apparatus, chemical, substance, or any
           other material made, used, or sold by or utilizing or practicing a
           Licensed Method.

   1.3    "Licensed Method" means any process or method which is covered by
           Regents' Patent Rights or whose use or practice would constitute an
           infringement of any claim within Regents' Patent Rights.



                                     1
<PAGE>




    1.4    The "Licensed Field" shall mean all fields of use.

    1.5    "Affiliate" means any corporation or other business entity in which
           Progenics owns or controls, directly or indirectly, at least 50% of
           the outstanding stock or other voting rights entitled to elect
           directors. In any country where the local law does not permit foreign
           equity participation of at least 50%, then "Affiliate" means any
           company in which Progenics owns or controls, directly or indirectly,
           the maximum percentage of outstanding stock or voting rights that is
           permitted by local law.

    1.6    "First Commercial Sale" means the first sale of any Licensed Product
           by Progenics or any Affiliate or Sublicensee, following approval of
           its marketing by the appropriate governmental agency for the country
           in which the sale is to be made. When governmental approval is not
           required, "First Commercial Sale" means the first sale in that
           country.

    1.7    [***]







    1.8    "Sublicensee" means any third party sublicensed by Progenics to make,
           have made, use, sell, or have sold any Licensed Product or to
           practice any Licensed Method.

    1.9    [***]













2. GRANT

    2.1    The Regents hereby grants to Progenics an exclusive license (the
           "License") under Regents' Patent Rights, in jurisdictions where
           Regents' Patent Rights exist, to make, have made, use, sell, have
           sold and offer to sell Licensed Products and to practice Licensed
           Methods in the Licensed Field.

    2.2    The License is subject to all the applicable provisions of any
           license to the United States Government executed by The Regents.
           The License is subject to any overriding obligations to the United
           States Federal Government under 35 U.S.C. Section 201-212.

    2.3    The Regents expressly reserves the right to use Regents' Patent
           Rights and associated technology for educational, research and
           clinical purposes and for any other purpose that is not inconsistent
           with the rights granted to Progenics in this Agreement.


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3. SUBLICENSES

    3.1    The Regents also grants to Progenics the right to issue exclusive or
           nonexclusive sublicenses ("Sublicenses") to third parties to make,
           have made, use, sell, and have sold Licensed Products and to practice
           Licensed Methods in any jurisdiction under which Progenics has
           exclusive rights under this Agreement. All Sublicenses will be
           subject to the rights of The Regents under this Agreement.
           Sublicenses will also be subject to the rights of the United States
           Federal Government under 35 U.S.C. Section 201-212.

    3.2    Progenics must pay to The Regents [***]

    3.3    Progenics must provide to The Regents a copy of each Sublicense
           within 30 days of execution, and a copy of all information submitted
           to Progenics by Sublicensee relevant to the computation of the
           payments due to The Regents under this Article 3.

    3.4    If this Agreement is terminated for any reason, all outstanding
           Sublicenses will be assigned by Progenics to The Regents. The
           Sublicenses will remain in full force and effect with The Regents
           as the licensor or sublicensor instead of Progenics, but the duties
           of The Regents under the assigned Sublicenses will not be greater
           than the duties of The Regents under this Agreement, and the rights
           of The Regents under the assigned Sublicenses will not be less than
           the rights of The Regents under this Agreement, including all
           financial consideration and other rights of The Regents.

4. CONSIDERATION

    4.1    In consideration for the License, Progenics will pay to The Regents
           [***]           within 30 days of the Effective Date. This fee is 
           nonrefundable and is not an advance against royalties.

    4.2    Progenics must pay to The Regents [***]          beginning on the 
           one-year anniversary date of the Effective Date of this Agreement and
           continuing annually on each anniversary date of the Effective Date.
           The maintenance fee will not be due and payable on any anniversary 
           date of the Effective Date if on that date Progenics is commercially
           selling a Licensed Product and paying an earned royalty to The 
           Regents on the sales of that Licensed Product.
           The license maintenance fees are non-refundable and are not an
           advance against royalties.

5. ROYALTIES

    5.1    Progenics must pay to The Regents for sale of Licensed Product(s)
           sold by Progenics or its Affiliates an earned royalty of [***]
           

    5.2    Paragraphs 1. 1, 1.2 and 1.3 define Regents' Patent Rights, Licensed
           Products and Licensed Methods so that royalties are payable on
           products covered by issued patents. Royalties accrue for the duration
           of this Agreement.


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    5.3    Progenics must pay royalties owed to The Regents on a quarterly
           basis. Progenics must pay the royalties within two months of the
           end of the calendar quarter in which the royalties accrued.

    5.4    All monies due The Regents must be paid in United States funds. When
           Licensed Products are sold for monies other than United States
           dollars, the royalties will first be determined in the foreign
           currency of the country in which those Licensed Products were sold
           and, second, converted into equivalent United States funds. Progenics
           must use the exchange rate established by the Bank of America in San
           Francisco, California on the last day of the calendar quarter.

    5.5    Any tax for the account of The Regents required to be withheld by
           Progenics under the laws of any foreign country must be promptly paid
           by Progenics for and on behalf of The Regents to the appropriate
           governmental authority. Progenics will use its best efforts to
           furnish The Regents with proof of payment of any tax. Progenics is
           responsible for all bank transfer charges. All payments made by
           Progenics in fulfillment of The Regents' tax liability in any 
           particular country will be credited against fees or royalties due
           The Regents for that country.

    5.6    If legal restrictions in any country prevent the prompt remittance by
           Progenics of some or all royalties, then Progenics will have the
           right and option to make those payments by depositing them in local
           currency to The Regents' account in a bank or other depository in
           that country. If the royalties still cannot be returned to the United
           States after one year of good-faith efforts by The Regents to recover
           them, Progenics will be responsible for payment in the United States.

    5.7    If any patent or any claim included in Regents' Patent Rights is held
           invalid or unenforceable in a final decision by a court of competent
           jurisdiction from which no appeal has or can be taken, all obligation
           to pay royalties based on that patent or claim or any claim
           patentably indistinct from it will cease as of the date of that final
           decision. Progenics will not, however, be relieved from paying any
           royalties that accrued before that decision or that are based on
           another patent or claim not involved in that decision.

    5.8    If Progenics transfers Licensed Products for end-use to itself or an
           Affiliate or Sublicensee, that transfer is considered a sale at list
           price, and Progenics must pay a royalty in accordance with this
           Article 5 (Royalties). If Progenics sells a Licensed Product to an
           Affiliate or Sublicensee at a price lower than that customarily
           charged to an unrelated third party, the royalties paid to The
           Regents will be based on the Net Sales of Licensed Products by the
           Affiliate or Sublicensee to their customers.

6. DILIGENCE

    6.1    Upon the execution of this Agreement, Progenics must diligently
           proceed with the development, manufacture and sale
           ("Commercialization") of Licensed Products and must earnestly and
           diligently endeavor to market them within a reasonable time after
           execution of this Agreement and in quantities sufficient to meet the
           market demands for them.

    6.2    Progenics must endeavor to obtain all necessary governmental
           approval for the Commercialization of Licensed Products.


                                     4


<PAGE>

     6.3   The Regents has the right and option to terminate this Agreement if
           Progenics fails to perform any of the terms in this Paragraph 6.3.
           This right, if exercised by The Regents, supersedes the rights
           granted in Article 2 (Grant).

           [***]












    6.4    To exercise its right under Paragraph 6.3 to terminate this
           Agreement, The Regents must give Progenics written notice of the
           deficiency. Progenics thereafter has 60 days to cure the deficiency
           or to request arbitration. If The Regents does not receive within
           the 60 days either a written request for arbitration or satisfactory
           tangible evidence that Progenics has cured the deficiency, then The
           Regents may, at its option, terminate this Agreement by giving
           written notice to Progenics.

    6.5    Progenics has the sole discretion for making all decisions as to how
           to commercialize any Licensed Product.

7. PATENT FILING, PROSECUTION AND MAINTENANCE

    7.1    The Regents will maintain the patents comprising Regents' Patent
           Rights. These patents will be held in the name of The Regents and
           will be maintained with counsel of The Regents' choice. The Regents
           must provide Progenics with copies of each patent request for
           terminal disclaimer, and request for reissue or reexamination
           of any patent under Regents' Patent Rights. The Regents will consider
           any comments or suggestions by Progenics. The Regents is entitled 
           to take action to preserve rights and minimize costs whether or not
           Progenics has commented.

    7.2    Progenics will bear all costs incurred during the term of this
           Agreement in the maintenance of patents in Regents' Patent Rights.
           Progenics will reimburse The Regents for the maintenance fees for the
           Patent and the reasonable attorney's fees for services in connection 
           with the payment of the maintenance fees. Progenics must send payment
           to The Regents within 30 days of Progenics's receipt of an invoice.

    7.3    Progenics' obligation to underwrite and to pay all United States
           patent costs will continue for as long as this Agreement remains in
           effect. Progenics may terminate its obligations with respect to any
           given patent upon three months written notice to The Regents. The
           Regents will use its best efforts to curtail patent costs chargeable
           to Progenics under this Agreement after this notice is received from
           Progenics. The Regents may continue prosecution or maintenance of 
           these application(s) or patent(s) at its sole discretion and expense,
           and Progenics will have no further rights or licenses to them.

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    7.4    The Regents will use its best efforts to not allow any Regents'
           Patent Rights for which Progenics is licensed and is underwriting
           the costs of to lapse or become abandoned without Progenics'
           authorization or reasonable notice. The Regents must notify
           Progenics 90 days prior to the proposed abandonment. Within 30 days
           after receipt of the notice, Progenics must, in writing, either (a)
           concur in the abandonment or (b) elect to assume responsibility 
           for the prosecution and maintenance of all Patent Rights that The
           Regents proposes to abandon. Lack of written response to The Regents
           within 30 days will constitute concurrence.

8. PATENT INFRINGEMENT

    8.1    In the event that Progenics learns of the substantial infringement of
           any patent in Regents' Patent Rights, Progenics will inform The
           Regents in writing and will provide The Regents with reasonable
           evidence of the infringement. During the period and in a jurisdiction
           where Progenics has exclusive rights under this Agreement, neither
           party will notify a third party of the infringement of any of
           Regents' Patent Rights without first obtaining consent of the other
           party, which consent must not be unreasonably denied. Both parties
           will use their best efforts to cooperate to terminate the
           infringement without litigation.

    8.2    Progenics may request that The Regents take legal action against the
           infringement of Regents' Patent Rights. This request must be in
           writing and must include reasonable evidence of the infringement and
           the damages to Progenics. If the infringing activity has not been
           abated within 90 days following the effective date of the request,
           The Regents has the right to (a) commence suit on its own account or
           (b) refuse to participate in a suit. The Regents must give notice of
           its election in writing to Progenics by the end of the 100th day
           after receiving notice of the request from Progenics. Progenics may
           thereafter bring suit for patent infringement in its own name if
           and only if The Regents elected not to commence suit and if the
           infringement occurred during the period and in a jurisdiction where
           the third party had allegedIy infringed Progenics's exclusive rights
           under this Agreement. However, in the event Progenics elects to bring
           suit in accordance with this Paragraph 8.2, The Regents may
           thereafter join the suit at its own expense. Progenics has the right
           to join any litigation brought by The Regents at Progenics's cost and
           expense and with counsel of Progenics's choice.

    8.3    Any legal action will be at the expense of the party that brings the
           suit and, with the exception of Paragraph 8.5, all recoveries will
           belong to that party. Legal action brought jointly by The Regents and
           Progenics and fully participated in by both, however, will be at the
           joint expense of the parties and all recoveries will be shared
           jointly by them in proportion to the share of expense paid by each
           party.

    8.4    Each party must cooperate with the other in litigation proceedings
           instituted under this Article but at the expense of the party who
           brings the suit. The litigation will be controlled by the party
           bringing the suit, although The Regents may be represented by 
           counsel of its choice if The Regents joins a suit brought by
           Progenics.

    8.5    If Progenics undertakes the enforcement or defense of any Regents'
           Patent Rights by litigation, any recovery of damages by Progenics
           will be applied first toward Progenics's unreimbursed expenses and
           legal fees relating to the suit. Progenics will retain the balance of
           the recovery but will pay The Regents [***]


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9. PROGRESS AND ROYALTY REPORTS

    9.1    Beginning January 31, 1997, Progenics must submit to The Regents
           semiannual progress reports covering Progenics's activities related
           to the development and testing of all Licensed Products and the
           obtaining of the governmental approvals necessary for marketing.
           These progress reports must be made for each Licensed Product until
           its First Commercial Sale.

    9.2    The progress reports submitted under Paragraph 9.1 must include the
           following topics:

           9.2(a) Summary of work completed.

           9.2(b) Key scientific discoveries.

           9.2(c) Summary of work in progress.

           9.2(d) Current schedule of anticipated events or milestones.

           9.2(e) Market plans for introduction of Licensed Products.

           9.2(f) A summary of resources (dollar value) spent in the 
                  reporting period.

    9.3.   Progenics must notify The Regents if Progenics or any of its
           Sublicensees or Affiliates ceases to be a small entity (as defined by
           the United States Patent and Trademark Office) under the provisions
           of 35 U.S.C. Section 41(h).

    9.4    Progenics must report the date of the First Commercial Sale in the
           royalty report immediately following that Sale.

    9.5    After the First Commercial Sale of each Licensed Product, Progenics
           must make quarterly royalty reports to The Regents by February 28,
           May 31, August 31 and November 30 of each year (i.e., within two
           months from the end of each calendar quarter). Each royalty report
           must cover Progenics's most recently completed calendar quarter and
           must show:

           9.5(a) Gross sales and Net Sales of any Licensed Product.

           9.5(b) Number of each type of Licensed Product sold.

           9.5(c) Royalties payable to The Regents.

    9.6    Progenics must state in its royalty report if it had no sales of any
           Licensed Product.

10. BOOKS AND RECORDS

    10.1   Progenics must keep accurate books and records of all Licensed
           Products manufactured, used or sold. Progenics must preserve these
           books and records for at least five years from the date of the
           royalty payment to which they pertain.

    10.2   The Regents' representatives or agents are entitled to inspect these
           books and records at reasonable times. The Regents will pay the fees
           and expenses of these inspections. If an error favoring Progenics of
           more than 5% of the total annual royalties is discovered, then
           Progenics will pay the fees and expenses of these inspections.

11. LIFE OF THE AGREEMENT


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<PAGE>

    11.1   Unless otherwise terminated by operation of law or by acts of the
           parties in accordance with the terms of this Agreement, this
           Agreement is in force from the Effective Date recited on page one
           and remains in effect for the life of the last-to-expire patent in
           Regents' Patent Rights.

    11.2   Upon termination of this Agreement, Progenics will have no further
           right to make, have made, use or sell any Licensed Product except
           as provided in Article 14 (Disposition of Licensed Products on Hand
           Upon Termination).

    11.3   Any expiration or termination of this Agreement will not affect the
           rights and obligations set forth in the following Articles:

           Article 10 Books and Records.
           Article 14 Disposition of Licensed Products on Hand upon Termination.
           Article 16 Use of Names and Trademarks.
           Article 18 Indemnification.
           Article 23 Failure to Perform.

12. TERMINATION BY THE REGENTS

    12.1   If Progenics violates or fails to perform any material term or
           covenant of this Agreement, then The Regents may give written notice
           of the default ("Notice of Default") to Progenics. If Progenics does
           not repair the default within 90 days after the effective date of the
           Notice of Default, then The Regents has the right to terminate this
           Agreement and the License by a second written notice ("Notice of
           Termination") to Progenics. If The Regents sends a Notice of
           Termination to Progenics, then this Agreement automatically
           terminates on the effective date of this notice. Termination does not
           relieve Progenics of its obligation to pay any royalty or fees owing
           at the time of termination and does not impair any accrued right of
           The Regents.

    12.2   The provisions of Article 6 (Diligence), and not Paragraph 12.1, will
           apply to termination for lack of diligence.

13. TERMINATION BY LICENSEE

    13.1   Progenics has the right at any time to terminate this Agreement in
           whole or with respect to any portion of Regents' Patent Rights by
           giving written notice to The Regents. This notice of termination will
           be subject to Article 19 (Notices) and will be effective 90 days
           after the effective date of the notice.

    13.2   Any termination in accordance with Paragraph 13.1 does not relieve
           Progenics of any obligation or liability accrued prior to
           termination. Nor does termination rescind anything done by Progenics
           or any payments made to The Regents prior to the effective date of
           termination. Termination does not affect in any manner any rights of
           The Regents arising under this Agreement prior to termination.

14. DISPOSITION OF LICENSED PRODUCTS ON HAND UPON TERMINATION


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<PAGE>

   14.1    Upon termination of this Agreement, Progenics will have the right to
           dispose of all previously made or partially made Licensed Products,
           but no more, within a period of six months. But Progenics must submit
           royalty reports on the sale of these Licensed Products and must
           pay royalties at the rate and at the time provided in this Agreement.

15. PATENT MARKING

   15.1    Progenics and their Sublicensees must mark all Licensed Products
           made, used or sold under the terms of this Agreement, or their
           containers, in accordance with the applicable patent marking laws.

16. USE OF NAMES AND TRADEMARKS

   16.1    Neither party is permitted to use any name, trade name, trademark or
           other designation of the other party or its employees (including
           contraction, abbreviation or simulation of any of the foregoing) in
           advertising, publicity or other promotional activity. Unless required
           by law, Progenics is expressly prohibited from using the name "The
           Regents of the University of California" or the name of any campus of
           the University of California.

17. LIMITED WARRANTY

   17.1    The Regents warrants that it has the lawful right to grant this
           license to Progenics.

   17.2    This License and the associated Invention are provided WITHOUT
           WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
           OR ANY OTHER WARRANTY, EXPRESS OR IMPLIED. THE REGENTS MAKES NO
           REPRESENTATION OR WARRANTY THAT ANY LICENSED PRODUCT OR LICENSED
           METHOD WILL NOT INFRINGE ANY PATENT OR OTHER PROPRIETARY RIGHT.

   17.3    IN NO EVENT WILL THE REGENTS BE LIABLE FOR ANY INCIDENTAL, SPECIAL
           OR CONSEQUENTIAL DAMAGES RESULTING FROM EXERCISE OF THIS LICENSE OR
           THE USE OF THE INVENTION OR LICENSED PRODUCTS OR THE USE OR THE
           PRACTICE OF LICENSED METHODS.

   17.4    Nothing in this Agreement will be construed as:

           17.4(a) A warranty or representation by The Regents as to the 
                   validity or scope of any Regents' Patent Rights.

           17.4(b) A warranty or representation that anything made, used, 
                   sold or otherwise disposed of under any license granted 
                   in this Agreement is or will be free from infringement of 
                   patents of third parties.

           17.4(c) An obligation to bring or prosecute actions or suits 
                   against third parties for patent infringement except as 
                   provided in Article 8 (Patent Infringement).


                                     9

<PAGE>

           17.4(d) Conferring by implication, estoppel or otherwise any 
                   license or rights under any patents of The Regents other 
                   than Regents' Patent Rights as defined herein, regardless 
                   of whether such patents are dominant or subordinate to 
                   Regents' Patent Rights.

           17.4(e) An obligation to furnish any know-how not provided in 
                   Regents' Patent Rights.

18. INDEMNIFICATION

   18.1    Progenics must indemnify, hold harmless and defend The Regents, its
           officers, employees, and agents, the inventors of the patents and
           patent applications in Regents' Patent Rights and their respective
           employers from and against any and all liability, claims, suits,
           losses, damages, costs, fees and expenses resulting from or arising
           out of exercise of this License.

   18.2    Progenics, at its sole cost and expense, must insure its activities
           in connection with the work under this Agreement and obtain, keep in
           force and maintain Comprehensive or Commercial Form General
           Liability Insurance (contractual liability included) with limits
           as follows:

           18.2(a) Each occurrence                                   [***]
           18.2(b) Products/completed operations aggregate           [***]
           18.2(c) Personal and advertising injury                   [***]
           18.2(d) General aggregate (commercial form only)          [***]


   18.3    Progenics expressly understands, however, that the coverages and
           limits in Paragraph 18.2 do not in any way limit the Progenics's
           liability. Progenics must furnish The Regents with certificates
           of insurance evidencing compliance with all requirements. Progenics
           is not required to insure its activities pertaining to the products'
           liability risks until it begins to use Licensed Products in human
           subjects. Progenics's insurance must:

          18.3(a) Provide for 30-day advance written notice to The Regents of 
                  any modification.

          18.3(b) Indicate that The Regents of the University of California is
                  endorsed as an Insured under the coverages listed in 
                  Paragraph 18.2.

          18.3(c) Include a provision that the coverages will be primary and
                  will not participate with nor will be excess over any valid
                  and collective insurance or program of self-insurance 
                  carried or maintained by The Regents.

19. NOTICES

   19.1    Any notice or payment required to be given to either party must be
           sent to the respective address given below and is effective: (a) on
           the date of delivery if delivered in person, (b) five days after
           mailing if mailed by first-class certified mail, postage paid, or
           (c) on the next business day if sent by overnight delivery. Either
           party may change its designated address by written notice.

           For Licensee:           PROGENICS PHARMACEUTICALS. INC.
                                   777 Old Saw Mill River Road
                                   Tarrytown, NY 10591
                                   (914) 789-2800



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                                   Attention: Joel Sendek

           For The Regents:        The Regents of the University of California
                                   Business Research Partnerships
                                   Box 951525, 1106 Ueberroth Building
                                   University of California, Los Angeles
                                   Los Angeles, California 90095-1525


                                   Attention: Fredrica S. Reiter

                                   VIA OVERNIGHT DELIVERY:
                                   The Regents of the University of California
                                   Business Research Partnerships
                                   Box 951525, 1106 Ueberroth Building
                                   University of California, Los Angeles
                                   Los Angeles, California 90095-1525


                                   Attention: Fredrica S. Reiter


20. ASSIGNABILITY

   20.1    This Agreement is binding upon and inures to the benefit of The
           Regents, its successors and assigns. But it is personal to Progenics
           and assignable by Progenics only with the written consent of The
           Regents, which consent may not be unreasonably withheld. The consent
           of The Regents will not be required if the assignment is in
           conjunction with the transfer of all or substantially all of the
           business of Progenics to which this license relates.

21. LATE PAYMENTS

   21.1    For each royalty payment or fee not received by The Regents when due,
           Progenics must pay to The Regents a simple interest charge of [***] 
           per annum to be calculated from the date payment was due until it 
           was actually received by The Regents.

22. WAIVER

   22.1    The waiver of any breach of any term of this Agreement does not waive
           any other breach of that or any other term.

23. FAILURE TO PERFORM

   23.1    If either party takes legal action against the other because of a
           failure of performance due under this Agreement, then the prevailing
           party is entitled to reasonable attorney's fees in addition to costs
           and necessary disbursements.

24. GOVERNING LAWS


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   24.1    THIS AGREEMENT IS TO BE INTERPRETED AND CONSTRUED IN ACCORDANCE WITH
           THE LAWS OF THE STATE OF CALIFORNIA, but the scope and validity of
           any patent or patent application will be governed by the applicable
           laws of the country of the patent or patent application.

25. GOVERNMENT APPROVAL OR REGISTRATION

   25.1    If this Agreement or any associated transaction is required by the
           law of any nation to be either approved or registered with any
           governmental agency, Progenics will assume all legal obligations
           to do so. Progenics will notify The Regents if it becomes aware that
           this Agreement is subject to a United States or foreign government
           reporting or approval requirement. Progenics will make all necessary
           filings and pay all costs including fees, penalties, and all other
           out-of-pocket costs associated with such reporting or approval
           process.

26. EXPORT CONTROL LAWS

    26.1   Progenics must observe all applicable United States and foreign
           laws with respect to the transfer of Licensed Products and related
           technical data to foreign countries, including the International
           Traffic in Arms Regulations (ITAR) and the Export Administration
           Regulations.

27. PREFERENCE FOR UNITED STATES INDUSTRY

   27.1    Because this Agreement grants an exclusive right to a particular use
           of the Invention, Progenics must manufacture in the United States
           any products embodying this Invention or produced through the
           Invention's use to the extent required by 35 U.S.C. Section 201-212.

28. FORCE MAJEURE

   28.1    The parties will be excused from any performance required under this
           Agreement if performance is impossible or unfeasible due to any
           catastrophe or other major event beyond their reasonable control,
           including war, riot, or insurrection; laws, proclamations, edicts,
           ordinances or regulations; strikes, lockouts or other serious labor
           disputes; and floods, fires, explosions, or other natural disasters.
           When such events abate, the parties' respective obligations will
           resume.

29. ARBITRATION

   29.1    At the request of either party, any controversy or claim arising out
           of or relating to the diligence provisions of this Agreement
           (Article 6) will be settled by arbitration conducted in Los 
           Angeles, California in accordance with the then current Licensing
           Agreement Arbitration Rules of the American Arbitration Association.
           Judgment upon the award rendered by the Arbitrator(s) will be binding
           on the parties and may be entered by either party in the court or 
           forum, state or federal, having jurisdiction.

30. CONFIDENTIALITY

    30.1   If either party discloses confidential information to the other
           party, the disclosing party will designate this information as
           confidential by appropriate legend or instruction, and the
           receiving party will:


                                     12

<PAGE>


           30.1(a) Use the same degree of care to maintain the secrecy of the
                   confidential information as it uses to maintain the secrecy
                   of its own information of like kind.

           30.1(b) Use the confidential information only to accomplish the
                   purposes of this Agreement.

   30.2    Neither party will disclose confidential information received from
           the other party except to its employees, customers, distributors and
           other agents who are bound to it by similar obligations of confidence
           and only as required to accomplish the purposes of this Agreement.

   30.3    Neither party will have any confidentiality obligation with respect
           to the confidential information belonging to or disclosed by the
           other party that:

           30.3(a) The receiving party can demonstrate by written records was
                   previously known to it.

           30.3(b) The receiving party lawfully obtained from sources under no
                   obligation of confidentiality.

           30.3(c) Is or becomes publicly available other than through an act or
                   omission of the receiving party or any of its employees.

           30.3(d) Is required to be disclosed under the California Public
                   Records Act or other requirement of law.

   30.4    The provisions of this Article 30 will continue in effect for five
           years after expiration or termination of this Agreement.

31. MISCELLANEOUS

   31.1    The headings of the several sections are inserted for
           convenience of reference only and are not intended to be a part of,
           or to affect the meaning or interpretation of, this Agreement.

   31.2    This Agreement is not binding upon the parties until it has been
           signed below on behalf of each party, in which event it becomes
           effective as of the date recited on page one.

   31.3    No amendment or modification of this Agreement will be valid or
           binding upon the parties unless made in writing and signed by each
           party.

   31.4    This Agreement embodies the entire understanding of the parties and
           supersedes all previous communications, representations or
           understandings, either oral or written, between the parties relating
           to the subject matter hereof.

   31.5    If any part of this Agreement is for any reason found to be
           unenforceable, all other parts nevertheless remain enforceable as
           long as a party's rights under this Agreement are not materially
           affected. In lieu of the unenforceable provision, the parties will
           substitute or add as part of this Agreement a provision that will be
           as similar as possible in economic and business objectives as was
           intended by the unenforceable provision.


                                     13

<PAGE>


Both The Regents and Progenics have executed this Agreement in duplicate
originals by their authorized offficers on the dates written below:


PROGENICS PHARMACEUTICALS, INC.                   THE REGENTS OF THE UNIVERSITY
                                                  OF CALIFORNIA


By /s/ PAUL J. MADDON                             By /s/ FREDRICA S. REITER
- ---------------------                             -------------------------
    Signature                                            Signature


Name  Paul J. Maddon, M.D., Ph.D.                  Name   Fredrica S. Reiter
      --------------------------

Title Chairman and CEO                            Title   Licensing Associate
      ----------------

Date  September 10, 1996                          Date    9-6-96
      ------------------


                                                  THE REGENTS OF THE UNIVERSITY
                                                  OF CALIFORNIA

                                                  By /s/ EMILY E. WALDRON
                                                     --------------------
                                                           Signature

                                                  Name     Emily E. Waldron

                                                  Title    Licensing Associate

                                                  Date     9-6-96



           Approval as to legal form: /s/ HOWARD B. SCHECKMAN          9/9/96
                                      -----------------------          -------
                                          Howard B. Scheckman          Date
                                          Assistant Resident Counsel
                                          Office of Technology Transfer
                                          University of California




                                     14



<PAGE>
                                                               Exhibit 10.20

                             SUPPLY AGREEMENT

     This supply agreement is entered into as of July 1, 1996 (the "Effective 
Date") between PerImmune, Inc. ("PerImmune") and Progenics Pharmaceuticals, 
Inc. (each singularly a "Party" and collectively the "Parties") with 
reference to the following:

                                 RECITALS

     WHEREAS, PerImmune, Inc. manufactures purified keyhole limpet hemocyanin 
("KLH"); and

     WHEREAS, Progenics Pharmaceuticals, Inc. is performing research and 
development in the field of vaccines for human cancers and is interested in 
purchasing KLH from PerImmune, Inc. for use as a carrier protein for such 
vaccines;

     THEREFORE, the parties agree as follows:

1. DEFINITIONS. The following terms shall have the following meanings for 
purposes of this Agreement:

     1.1 "AFFILIATE" means any corporation, firm, partnership or other 
entity, whether de jure or de facto, which directly or indirectly owns, is 
owned by, or is 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. For example, Akzo, N.Y. is an Affiliate of PerImmune 
pursuant to this definition.

     1.2 "AGREEMENT" means this Supply Agreement, including any exhibits, 
schedules or other attachments thereto, as any of the foregoing may be 
validly amended and agreed to in writing by the Parties from time to time.

     1.3 "COMMERCIAL INTRODUCTION" means the date of first commercial sale 
(other than for purposes of obtaining regulatory approval) of a Ganglioside 
Vaccine by Progenies Pharmaceuticals, Inc.

     1.4 "EFFECTIVE DATE" is defined in the introductory paragraph.


     1.5 "FULLY BURDENED MANUFACTURING COST" means the actual cost of 
Manufacture by PerImmune of KLH under a Manufacturing Process in compliance 
with

<PAGE>                                    Page 2

cGMPs, which actual cost shall be comprised of the cost of goods produced as 
determined in accordance with United States generally accepted accounting 
principles, [***]


     1.6 "cGLPs" means the current Good Laboratory Practices for Finished 
Pharmaceuticals pursuant to 21 C.F.R. 58 et sea., as amended from time to 
time.

     1.7 "cGMPs" means the current Good Manufacturing Practices for Finished 
Pharmaceuticals pursuant to 21 C.F.R. 210 et seci., as amended from time to 
time.

     1.8 "KLH" means keyhole limpet hemocyanin.

     1.9 "KLH REQUIREMENTS" means the amount of KLH in bulk which Progenics 
Pharmaceuticals, Inc. may require for all research and development, 
pre-clinical and human clinical testing of Ganglioside Vaccines and, after 
Commercial Introduction, production of Ganglioside Vaccines for commercial 
sales.

     1.10 "KNOW-HOW" means materials, data, results, formulae, designs, 
specifications, methods, processes, improvements, techniques, ideas, 
discoveries, technical information, process information, clinical information 
and any other information, whether or not any of the foregoing is patentable, 
which is confidential (in accordance with Section 5 hereof and proprietary to 
PerImmune now or hereafter during the Term of this Agreement, to the extent 
that any of the foregoing relates to the development, manufacture, use or 
sale of KLH in connection with the development, manufacture, use or sale of 
any Gangiloside Vaccine, provided however, that the term "Know-how" shall not 
include any of the foregoing that is subject to proprietary rights of third 
parties.

     1.11  "GANGLIOSIDE VACCINE" means any vaccine or vaccines comprising 
purified gangliosides (whether alone or in combination) conjugated to KLH for 
the prevention or treatment of human cancers. A ganglioside is a neuraminic 
acid containing glycolipids.

     1.12 "MANUFACTURE" OR "MANUFACTURING PROCESS" means the aseptic-storage, 
handling, production, processing and packaging of KLH in accordance with this 
Agreement.

     1.13 ."MANUFACTURING YEAR" means each calendar year commencing on or after 
January 1, 1995.

     1.14 "PARTY" and "PARTIES" are defined in the introductory paragraph.

     1.15 "PERIMMUNE" means PERIMMUNE, INC., (formerly Organon Teknika 
Corporation Biotechnology Research Institute) , a Delaware corporation, its 
Affiliates and its successors and permitted assigns.


[***] Confidential Treatment Requested

<PAGE>

                                    Page 3

     1.16 "SPECIFICATIONS" is defined in Exhibit A

     1.17 "TERM" is defined in Section 4.1.

     1.18 "PROGENICS" means Progenics Pharmaceuticals, Inc., a Delaware 
corporation, its Affiliates and its permitted successors and assigns.

2.    MANUFACTURE AND SUPPLY.

     2.1 GENERAL. [***] PerImmune hereby agrees, at its sole expense, to 
commit all reasonably necessary facilities, appropriately trained personnel, 
machinery, equipment, utilities and other PerImmune resources required to 
satisfy its obligations under this Agreement.








PerImmune hereby agrees, at its sole expense, to commit
all reasonably necessary facilities, appropriately trained personnel, 
machinery, equipment, utilities and other PerImmune resources required to 
satisfy its obligations under this Agreement.

2.2 PERIMMUNE TRANSFER PRICE OF KLH.

     [***] 
In addition, in order to verify the production cost of KLH, Progenics will 
have the right to pay for an independent certified public accountant, ("CPA") 
to inspect the records of PerImmune once per year during regular business 
hours, provided that such accountant has entered into a confidentiality 
agreement with PerImmune which is satisfactory to PerImmune. The CPA shall 
then compile a report which states only PerImmune's Fully Burdened 
manufacturing Cost for KLH which may be used by the Parties for negotiating 
the transfer price.







In addition, in order to verify the production 
cost of KLH, Progenics will have the right to pay for an independent 
certified public accountant, ("CPA") to inspect the records of PerImmune once 
per year during regular business hours, provided that such accountant has 
entered into a confidentiality agreement with PerImmune which is satisfactory 
to PerImmune. The CPA shall then compile a report which states only 
PerImmune's Fully Burdened Manufacturing Cost for KLH which may be used by 
the Parties for negotiating the transfer price.

     2.3 PERlMMUNE'S REPRESENTATIONS, WARRANTIES AND COVENANTS. PerImmune 
hereby represents and warrants to Progenics as follows:

     (a) PRE-CLINICAL STUDY AND HUMAN CLINICAL TRIAL USE, PerImmune shall 
Manufacture all KLH Requirements for use in any vaccine used in connection 
with any pre-clinical study or human clinical trial of any Ganglioside 
Vaccine (i) strictly in compliance with (A) this Agreement, (B) all 
Specifications, and (C) all applicable laws


[***] Confidential Treatment Requested

<PAGE>
                                     Page 4

and regulations, including but not limited to cGMPs to the extent applicable, 
and (ii) in a PerImmune facility holding all applicable licenses in the 
jurisdiction of Manufacture.

     (b) COMMERCIAL USE. PerImmune shall Manufacture all KLH Requirements for 
use in the commercialization of any Ganglioside Vaccine (i) strictly in 
compliance with (A) this Agreement, (B) all Specifications, and (C) all 
applicable laws and regulations, including but not limited to cGMPs to the 
extent applicable, and (ii) in a PerImmune facility holding all applicable 
licenses in the jurisdiction of Manufacture.

     (c) CERTIFICATE OF ANALYSIS: NON-COMPLYING KLH. Before, during and after 
Manufacture of KLH Requirements, PerImmune shall obtain samples, monitor the 
Manufacturing Process and the environment of such Manufacture, and keep such 
technical books and records of all of the foregoing as are required under the 
Specifications and Procedures and all applicable laws and regulations, 
including but not limited to cGLPs or cGMPs (as appropriate and applicable). 
PerImmune shall test each lot of KLH requirements Manufactured for Progenics 
or as required under the Specifications. Together with each such lot of KLH 
Requirements, PerImmune shall provide a written certificate of analysis which 
shall set forth the results of such testing by PerImmune and PerImmune's 
quality control approval of such lot of KLH Requirements. PerImmune's 
obligations under this section 2.3(c) shall be performed at PerImmune's sole 
expense. Progenics shall be entitled to test any such KLH Requirements in 
accordance with the Specifications, at Progenics' sole expense. Without 
limiting any of Progenics' other rights or remedies under this Agreement with 
respect to any KLH Requirements supplied hereunder that do not comply with 
applicable representations and warranties under this Section 2.3, and 
provided PerImmune reasonably confirms Progenics' test results, the Parties 
agree that; (i) Progenics shall not be obligated to pay PerImmune the 
transfer price applicable to such non-complying KLH Requirements; (ii) if 
Progenics has already paid for such non-complying KLH Requirements, Progenics 
shall be entitled to a credit against future purchases for the amount paid to 
PerImmune therefor; (iii) PerImmune shall, on a priority basis, Manufacture 
and supply to Progenics, as applicable, replacement KLH Requirements in full 
compliance with this Section 2.3; and (iv) PerImmune shall bear the full cost 
of returning or destroying the non-complying KLH Requirements.

     2.4 Procedures for Estimating, Ordering and Supplying - KLH REQUIREMENTS.

     Subject to the other terms of this Agreement:

     (a) ANNUAL DEMAND FORECAST FOR EACH MANUFACTURING YEAR. During the Term, 
commencing on July 1 , 1996 and on an on-going quarterly basis as described 
below, Progenics will provide PerImmune with a written rolling annual demand 
forecast of KLH Requirements for each manufacturing Year which shall be 
binding as to the first quarter and non-binding as to the remaining three (3) 
quarters. Thereafter, Progenics shall provide an updated annual demand 
forecast on a quarterly

<PAGE>

                                    Page 5

basis no later than ninety (90) days in advance of the commencement of the 
first (and binding) quarter covered by such annual demand forecast. The 
Parties also agree that the variance, if any, between the binding forecast of 
a given quarter and the last nonbinding forecast for such quarter shall be 
between     [***]         and         [***] 
meaning that Progenics' binding forecast for such quarter must be at least 
[***]           but not more than          [***] 
of such last non-binding forecasted amount for such quarter.

     (b) PURCHASE ORDERS. Progenics shall place a firm purchase order or 
purchase orders with PerImmune setting forth (i) the quantities of KLH 
Requirements to be Manufactured and supplied hereunder, (ii) the schedule for 
receipt from PerImmune of such batch(es) of KLH Requirements, and (iii) 
instructions for shipping and packaging. Each such firm purchase order shall 
be submitted no later than thirty (30) days in advance of the first scheduled 
date of receipt thereof. Subject to the other terms of this Agreement, 
Progenics shall be obligated to place firm purchase orders with PerImmune 
for, and PerImmune hereby commits to Manufacture and supply hereunder 
pursuant to such firm purchase orders,     [***]                  of the
amount of KLH Requirements in the then-binding quarter of each annual demand 
forecast under Section 2.4(b); provided, however, that: (A) the Parties may 
mutually agree in writing to amend any such firm purchase order; (B) 
PerImmune in its discretion may agree to Manufacture and supply hereunder 
additional amounts of KLH Requirements in excess of the then-binding amount, 
provided that Progenics places firm purchase order(s) for such excess KLH 
Requirements on a timely basis; and (C) PerImmune agrees to provide Progenics 
with as much advance written notice as possible (and in any case at least 
thirty (30) days' written advance notice) if PerImmune determines that any 
scheduled delivery of KLH Requirements pursuant to any purchase order will be 
delayed by more than fifteen (15) days for any reason of which PerImmune 
becomes aware.

     2.5 PRIORITY.

     a)    PRIORITY AMONG CUSTOMERS. PerImmune hereby agrees and acknowledges 
that, in the event that PerImmune is unable to satisfy in full its 
obligations under this Agreement to Manufacture and supply 
[***]          of KLH Requirements as well as PerImmune's obligations to 
third parties with respect to Manufacture and supply of KLH, PerImmune shall 
use reasonable efforts to satisfy its obligations under this Agreement and, 
in the event of any shortage of KLH available to meet all such obligations, 
PerImmune shall allocate proportionately all available KLH among Progenics 
and such third parties with highest priority for the Manufacture and supply 
of KLH for purposes of outstanding firm purchase orders for comparable 
delivery time frames. In such event PerImmune, shall be permitted to invoice, 
and Progenics agrees to pay, the additional expenses of PerImmune for such 
efforts.


[***] Confidential Treatment Requested

<PAGE>                                    Page 6

     (b) INABILITY TO SUPPLY. In the event that PerImmune is unable to supply 
[***] of Progenics' purchase orders for two consecutive quarters, then 
PerImmune agrees to provide Progenics the right and license to use the 
relevant Know-how to manufacture or have manufactured KLH for use in 
producing Ganglioside Vaccine, and to fully cooperate with regulatory 
authorities to qualify Progenics and/or its designee as a manufacturer of 
KLH. In such event, at Progenics' request, PerImmune shall promptly disclose 
to Progenics all Know-how and information reasonably necessary to manufacture 
KLH and the parties shall mutually agree upon a reasonable schedule for 
gradually reducing the amount of KLH purchased by Progenics from PerImmune, 
until such time PerImmune is able to reasonably demonstrate the ability to 
supply Progenics with its requirements.

     (c) ASSURANCE OF SUPPLY. Progenics and PerImmune will cooperate to 
anticipate Progenics' long-term requirements for KLH Requirements supply, and 
PerImmune will take reasonable measures to assure that Progenics' and its 
Partners' KLH Requirements can be met, which measures may include the 
maintenance of adequate safety stocks of KLH.

     2.6. REGULATORY APPROVAL OF MANUFACTURING. PerImmune shall be solely 
responsible, at its sole cost and expense, for obtaining all necessary 
regulatory approvals particular to KLH for Manufacture and supply of KLH 
Requirements. Progenics shall advise PerImmune of any new Specifications 
required by the United States Food and Drug Administration or the Federal 
Food, Drug and Cosmetic Act (or the equivalent regulatory authority or law In 
other countries) with respect to any Ganglioside Vaccine. PerImmune shall not 
modify in any manner any Specifications without Progenics prior written 
consent (which consent shall not be unreasonably withheld).

     2.7 REGULATORY FILINGS. Without limiting the generality of the 
foregoing, for purposes of supporting all preclinical studies and human 
clinical trials and all regulatory filings, applications and approvals on the 
part of Progenics with respect to any Ganglioside Vaccine, PerImmune hereby 
agrees that on an on-going basis during the Term: (1) PerImmune shall permit 
Progenics to reference PerImmune's drug master file and/or Investigational 
New Drug Applications (IND's) for KLH with the United States Food and Drug 
Administration; (ii) to the extent not subject to the proprietary rights of 
third parties, PerImmune shall provide Progenics with all pre-clinical and 
clinical data, results and other relevant information with respect to KLH 
(including but not limited to information regarding the toxicity, safety and 
stability of KLH) that is (A) submitted by PerImmune in connection with any 
Investigational New Drug application or other regulatory filing with respect 
to KLH from time to time during the Term or (B) otherwise in PerImmune's 
possession from time to time during the Term; and (iii) a PerImmune 
representative, at Progenics' request, shall attend periodic meetings to 
discuss the progress of clinical trials of any Ganglioside Vaccines. 
Progenics will reimburse


[***] Confidential Treatment Requested

<PAGE>
                                    Page 7

PerImmune for the foregoing assistance only (i) for its reasonable out-of 
pocket expenses, including but not limited to travel, and (ii) PerImmune's 
fully burdened costs of performing technical studies or engaging outside 
services subject to the prior approval of Progenics.

     a)    ADVERSE EVENTS REPORTING. On an on-going basis during the Term and 
for at least ten (10) years after the expiration or termination of this 
Agreement, each Party agrees to provide the other Party with any written 
information in its possession which indicates adverse effects in humans 
associated with KLH or any products using KLH.

     2.8 PERIMMUNE RECORDKEEPING AND INSPECTION.

     (a) TECHNICAL RECORDS. With respect to any Manufacture and supply of KLH 
Requirements, PerImmune shall, at its expense, keep properly completed 
technical books and records, test data and reports as required under the 
Specifications and all applicable laws and regulations, including but not 
limited to cGLPs or cGMPs (as appropriate), and in any case shall maintain 
such technical Information for at least two (2) years from the expiration 
date of the relevant Ganglioside Vaccine or longer if required under 
applicable laws and regulations (including but not limited to cGLPs and 
cGMPs, as applicable). During regular business hours and upon reasonable 
advance written request, PerImmune shall make any such technical information 
available to Progenics for inspection.

     (b) FINANCIAL RECORDS. During the Term, PerImmune shall keep for at 
least three (3) years records of its Fully Burdened Manufacturing Costs, and 
the calculations thereof in sufficient detail to permit Progenics designee, 
reasonably acceptable to PerImmune, to confirm the accuracy thereof. At the 
request of Progenics, and not more frequently than once per year, upon at 
least five (5) business days' prior written notice, and at the expense of 
Progenics (except as otherwise provided below), PerImmune shall permit a 
nationally recognized, independent, certified public accountant selected by 
Progenics and acceptable to PerImmune to inspect (during regular business 
hours) any such PerImmune records for the then-preceding three (3) years 
solely to the extent necessary to verify such costs, margins and 
calculations, provided that such accountant in advance has entered into a 
confidentiality agreement with PerImmune and Progenics substantially similar 
to the confidentiality provisions of this Agreement, limiting the use and 
disclosure of such information to authorized representatives of the Parties. 
Results of any such inspection shall be made available to both Parties. If 
such inspection reveals a deficiency in the calculation of PerImmune's Fully 
Burdened Manufacturing Cost to PerImmune resulting in an overpayment to 
PerImmune of the transfer price by [***] , PerImmune shall 
pay all costs and expenses of such inspection.

[***] Confidential Treatment Requested

<PAGE>


                                    Page 8

     (c) QUALITY AUDIT. Upon submission of a proposal by Progenics which is 
approved by PerImmune, PerImmune shall permit Progenics to audit, in 
cooperation with PerImmune's personnel, production, packaging, and quality 
control facilities of PerImmune and any of its significant suppliers as they 
relate to production of KLH to allow Progenics to verify PerImmune's 
compliance with its responsibilities under this Agreement.

     2.9 LIABILITY.

     (a) INDEMNIFICATION BY PROGENICS. Except as otherwise provided in 
Sections 2.9(b) or (c), Progenics will defend, indemnify and hold harmless 
PerImmune against any and all claims, actions, liabilities, damages, losses, 
costs or expenses, including reasonable attorney's fees, based upon or 
arising out of the sales or use of any Ganglioside Vaccine by Progenics, 
provided that PerImmune gives Progenics prompt notice thereof in writing, 
permits Progenics to control the investigation, preparation and defense 
thereof (including any compromise or settlement thereof and any appeal) and 
provides reasonable assistance to Progenics, at Progenics expense, in that 
regard.

     (b) LIABILITY. Each Party assumes full responsibility and liability for 
any injury, damage or expense which it or its employees, agents and invitees 
incur and which arise from its manufacture, handling and use of KLH or 
Ganglioside Vaccines, except to the extent such injury, damage or expense 
arises from the negligence or willful misconduct of the other Party.

     (c) INDEMNIFICATION BY PERIMMUNE. PerImmune will defend, indemnify and 
hold harmless Progenics against any and all claims, actions, liabilities, 
damages, losses, costs or expense (including reasonable attorneys' fees) 
including without limitation expenses of total or partial product recalls in 
connection with the manufacture, use or sale of Ganglioside Vaccines (i) 
based upon the gross negligence or willful misconduct of PerImmune or its 
employees arising out of the Manufacture or shipment of KLH Requirements by 
PerImmune or based upon a manufacturing defect in KLH Requirements 
manufactured by PerImmune; or (ii) the failure of PerImmune to comply with 
governmental regulations with respect to KLH, provided that Progenics or its 
Partners give PerImmune prompt notice thereof in writing, permits PerImmune 
to control the investigation, preparation and defense thereof (including any 
compromise or settlement thereof and any appeal) and provides reasonable 
assistance to PerImmune, at PerImmune's expense, in that regard.

3.    CONFIDENTIALITY.

     3.1. Each party agrees to take such steps and, when necessary to protect 
the rights of the other, shall cause its employees and agents and its 
Affiliates employees and agents, to take such steps as are reasonably 
required to protect and keep

<PAGE>

                                    Page 9

confidential, and shall not use, publicize or otherwise disclose to third 
parties other than Affiliates, Confidential Information (as defined below) of 
the other party, which was acquired from the other party pursuant to this 
Agreement, including, without limitation, following procedures designed to 
limit access of such information to those persons having a need to know it. 
The parties agree not to disclose or use such Confidential Information except 
as they may be entitled to do so or if necessary pursuant to or in the 
performance of this Agreement.

     3.2 The obligation of confidentiality and restriction on use imposed by 
the foregoing Subsection 3.1 shall not apply to any particular item of 
Confidential Information that:

     3. 2.1 is known or generally available, or subsequently becomes known or 
generally available, to the public, or is otherwise at the time of disclosure 
or subsequently becomes part of the public domain, whether by printed 
publication or otherwise through no fault of the receiving parties;

     3.2.2 the receiving party can demonstrate by competent evidence, based 
in substance upon writings and/or physical evidence, (i) was known to the 
receiving party at the time of receipt or (ii) is furnished to the receiving 
party without obligation of confidentiality or non-use by a third party, 
either before or after the time of its disclosure by the disclosing party, 
which third party is not restricted by a confidential undertaking to the 
disclosing party at the time of the disclosure;

     3.2.3 the receiving party can demonstrate by competent evidence, based 
in substance upon writings and/or physical evidence, has been developed 
independently for the receiving party by persons not having access to the 
Confidential information; or

     3.2.4 is the Confidential Information of the disclosing party and that 
the disclosing party discloses to a non-Affiliate party without restriction.

     3.3 The obligations of confidentiality and restriction on use under this 
Section 3 shall continue to be binding upon the parties for a period of five 
years following termination of this Agreement.

     3.4 Either party may also disclose Confidential Information disclosed to 
it by the other party to the extent, and only to the extent, such disclosure 
is necessary for such party to comply with applicable governmental laws or 
regulations. The party that desires to so disclose Information shall give the 
other party reasonable advance notice of any such proposed disclosure 
pursuant to such compliance with law or regulation, shall use its best 
efforts to secure confidential treatment of the Information thus disclosed, 
and shall advise the other party in writing of the manner in which that was 
done.

<PAGE>                                                                       
Page                                    Page 10

     3.5  For purposes of this Agreement, Confidential Information shall 
mean: (a) data, inventions, Information, processes, know-how, patent 
applications, trade secrets and similar intellectual property rights of a 
party, including, without limitation, the original and copies of all 
documents, inventions, laboratory notebooks, drawings, specifications, 
devices, equipment, prototype models and tangible manifestations embodying 
any technology disclosed hereunder, (b) a party's customer lists and 
marketing, sales, costs, royalty and similar information related to the 
manufacture or sale of KLH or other part of the Parties' business, and (c) 
any other information disclosed in writing and marked as "Confidential 
Information" or, if disclosed orally, reduced to writing and marked as 
"Confidential Information" and submitted within thirty (30) days of the 
original oral disclosure.

     3.6  PERMITTED DISCLOSURES. Each Party may disclose the other Party's 
information to the extent such disclosure is reasonably necessary in 
prosecuting or defending litigation, filing, prosecuting or maintaining 
patent applications or patents, complying with applicable laws or 
regulations, or, in the case of Progenics, conducting preclinical or clinical 
trials or preparing or filing regulatory filings with respect to Ganglioside 
Vaccines; provided, however, that if a Party is required to make any 
disclosure of the other Party's information furnished pursuant to this 
Agreement, it will give reasonable advance notice of such disclosure 
requirements to the other Party and, except to the extent inappropriate in 
the case of patent applications, will use its best efforts to secure 
confidential treatment of such information required to be disclosed.

4.  TERM: TERMINATION.

     4.1  TERM. The term of this Agreement shall be for three years from the 
Effective Date and will renew automatically for successive 12 month periods 
unless sooner terminated as provided in this Section 4.

     4.2 MATERIAL BREACH. Subject to Section 8.6, failure by either Party to 
comply with any of the material obligations contained in this Agreement shall 
entitle the other Party to give to the Party in default notice specifying the 
nature of the default and requiring it to make good such default. If such 
default is not cured within sixty (60) days after the receipt of such notice, 
the notifying Party shall be entitled, without prejudice to any of its other 
rights conferred on it by this Agreement and in addition to any other 
remedies available to it by law or in equity, to terminate this Agreement 
effective upon written notice to the other Party. The right of a Party to 
terminate this Agreement, as herein above provided, shall not be affected in 
any way by its waiver or failure to take action with respect to any previous 
default.

     4.3 INSOLVENCY OR BANKRuPTCY. Either Party may, in addition to any other 
remedies available to it by law or in equity, terminate this Agreement, in 
whole or in part as the terminating Party may determine, effective upon 
written notice to the other Party, in the event the other party shall have 
become insolvent or bankrupt, or shall have

<PAGE>

                                   Page 11

made an assignment for the benefit of its creditors, or there shall have been 
appointed a trustee or receiver of the other Party for all or a substantial 
part of its property, or any case or proceeding shall have been commenced 
seeking reorganization, liquidation, dissolution, winding-up, arrangement, 
composition or readjustment of its debts or any other relief under any 
bankruptcy, insolvency, reorganization or other similar act or law of any 
jurisdiction now or hereafter in effect, or there shall have been issued a 
warrant of attachment, execution, disdain or similar process against, any 
substantial part of the property of the other Party, and any such event shall 
have continued for sixty (60) days undismissed, unbounded and undischarged.

     4.4 ACCRUED RIGHTS, SURVIVING OBLIGATIONS: PARTNERS. Expiration or any 
termination of this Agreement for any reason shall be without prejudice to 
any rights which shall have accrued to the benefit of either Party prior to 
such expiration or termination. Such expiration or termination shall not 
relieve either Party from obligations which are expressly indicated to 
survive expiration or termination of this Agreement, which obligations 
include, without limitation, those under Sections 2.8, 2.9, 3, 5, 6 and 7.

5.   PERIMMUNE PATENT RIGHTS.

     PerImmune shall not assert against Progenics or its customers any 
patents now or hereinafter owned or controlled by PerImmune which concern KLH 
or any Ganglioside Vaccine of Progenics which incorporates KLH. This Section 
shall continue to apply to any Affiliate of PerImmune which ceases to be an 
Affiliate of PerImmune as defined by this Agreement.

6.   PERiMMUNE REPRESENTATIONS AND WARRANTIES.

     PerImmune represents and warrants that:

     (a) the execution and delivery of this Agreement and the performance of 
the transactions contemplated hereby have been duly authorized by PerImmune;

     (b) the performance by PerImmune of any of the terms and conditions of 
this Agreement on its part to be performed does not and will not constitute a 
breach or violation of any other agreement or understanding, written or oral, 
to which it is a party;

     (c) To the best of PerImmune's knowledge, there are no adverse 
proceedings, claims or actions pending, or threatened, relating to KLH and at 
the time of disclosure and delivery thereof to Progenics and PerImmune shall 
have the full right

<PAGE>

                                   Page 12

and legal capacity to disclose and deliver KLH without violating the rights 
of third parties.

7.   ARBITRATION.

     Any dispute, controversy or claim between the Parties, arising out of or 
relating to this Agreement or the Parties' respective rights and obligations 
hereunder either during or after the Term (including the question as to 
whether any such matter is arbitrable) shall be subject to binding 
arbitration in accordance with then-existing commercial arbitration rules of 
the American Arbitration Association. The Parties agree that, in the course 
of any such arbitration, service of any notice at their respective addresses 
in accordance with Section 8.11 of this Agreement shall be valid and 
sufficient, and any arbitration hereunder shall be in the jurisdiction of the 
defendant Party, which in the case of Progenics shall be New York and in the 
case of PerImmune shall be Maryland. In any such arbitration, an award shall 
be rendered by a majority of the members of a board of arbitration consisting 
of three (3) members, one (1) of whom shall be chosen by each of Progenics 
and PerImmune and the third of whom shall be appointed by mutual agreement of 
such two (2) arbitrators. In the event of failure of such two (2) arbitrators 
to agree within sixty (60) days after the commencement of arbitration (as 
defined below) upon appointment of the third arbitrator, or, in the event 
that either Party shall fail to appoint an arbitrator within thirty (30) days 
after the commencement of the arbitration proceedings, the third arbitrator 
or (upon request of the other Party) the second arbitrator and the third 
arbitrator, as the case may be, shall be appointed by the American 
Arbitration Association in accordance with its then existing commercial 
arbitration rules.    For purposes of this Section, the "commencement of the 
arbitration proceeding" shall mean the date upon which the defendant Party 
receives from the American Arbitration Association a copy of the request for 
arbitration filed by the party desiring to have recourse to arbitration. The 
decision of the arbitrators shall be in writing and shall set forth the basis 
therefor. The Parties shall abide by all awards rendered in arbitration 
proceedings, and such awards may be enforced and executed upon in any court 
having jurisdiction over the Party against whom enforcement of such award is 
to be sought. The Parties shall divide equally the administrative charges, 
arbitrators' fees, and related expenses of arbitration, but each Party shall 
pay its own legal fees incurred in connection with any such arbitration; 
provided, however, if the arbitrators determine that one Party prevailed 
clearly and substantially over the other Party, then the non-prevailing Party 
shall also pay the reasonable attorneys' fees and expert witness costs and 
other arbitration costs of the prevailing Party.

<PAGE>

                                   Page 13

8.   MISCELLANEOUS PROVISIONS.

     8.1  NO PARTNERSHIP. Nothing in this Agreement is intended or shall be 
deemed to constitute a partnership, distributorship, agency employer-employee 
or joint venture relationship between the Parties. No Party shall incur any 
debts or make any commitments for the other, except to the extent, if at all, 
specifically provided herein.

     8.2  ASSIGNMENTS. Neither Party shall assign any of its rights or 
obligations hereunder or this Agreement, except that either Party may do so: 
(a) as incident to the merger, consolidation, reorganization or acquisition 
of stock or assets affecting substantially all of the assets or voting 
control of such Party; (b) to any wholly owned subsidiary if such Party 
remains liable and responsible for the performance and observance of all of 
the subsidiary's duties and obligations hereunder; (c) with the prior written 
consent of the other Party; or (d) as incident to an agreement between 
Progenics and a major corporate partner. This Agreement shall be binding upon 
the successors and permitted assigns of the Parties and the name of a Party 
appearing herein shall be deemed to include the names of such Party's 
successors and permitted assigns to the extent necessary to carry out the 
intent of this Agreement. Any assignment not in accordance with this Section 
8.2 shall be void.

     8.3  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.

     8.4  NO NAME OR TRADEMARK RIGHTS. Except as otherwise provided herein, 
no right, express or implied, is granted by this Agreement to use in any 
manner the names "PerImmune, Inc." or "Progenics Pharmaceuticals, Inc." or 
any contraction thereof or any other trade name or trademark of PerImmune or 
Progenics in connection with the performance of this Agreement.

     8.5  PUBLIC ANNOUNCEMENT. Except as may otherwise be required by 
applicable law or regulation, neither Party shall make any public 
announcement concerning this Agreement or the subject matter hereof without 
the prior written consent of the other Party (not to be unreasonably 
withheld).

     8.6  FORCE MAJEURE. If any default or delay occurs which prevents or 
materially impairs a Party's performance and is due to a cause beyond the 
Party's reasonable control, including but not limited to any act of any god 
or demon, flood, fire, explosion, earthquake, casualty, accident, war, 
revolution, civil commotion, blockade or embargo, injunction, law, 
proclamation, order, regulation or governmental demand, the affected Party 
promptly shall notify the other Party in writing of such cause and shall 
exercise diligent efforts to resume performance under this Agreement as soon 
as possible. Neither Party shall be liable to the other Party for any loss or 
damage due to such cause. Neither Party may terminate this Agreement because 
of such default or delay.

<PAGE>

                                   Page 14

     8.7  ENTIRE AGREEMENT OF THE PARTIES: AMENDMENTS. This Agreement, 
including the exhibits attached hereto which are incorporated herein, 
constitutes and contains the entire understanding and agreement of the 
Parties and cancels and supersedes any and all prior negotiations, 
correspondence, understandings and agreements, whether verbal or written, 
between the Parties respecting the subject matter hereof. No waiver, 
modification or amendment of any provision of this Agreement shall be valid 
or effective unless made in writing and signed by a duly authorized officer 
of each of the Parties.

     8.8  SEVERABILITY. In the event that any of the provisions of this 
Agreement shall for any reason be held by any court or authority of competent 
jurisdiction to be invalid, illegal or unenforceable, such provision or 
provisions shall be validly reformed to as nearly as possible approximate the 
intent of the Parties and, if unreformable, shall be divisible and deleted in 
such jurisdiction; elsewhere, this Agreement shall not be affected so long as 
the Parties are still able to realize the principal benefits bargained for in 
this Agreement.

     8.9  CAPTIONS. The captions to this Agreement are for convenience only, 
and are to be of no force or effect in construing or interpreting any of the 
provisions of this Agreement.

     8.10  APPLICABLE LAW. This Agreement shall be governed by and 
interpreted in accordance with the laws of Maryland.

     8.11  NOTICE. All notices and other communications shall be deemed to 
have been duly given when delivered in person or by registered or certified 
mail (postage prepaid, returned receipt requested) to the respective parties 
as follows:

     If To Progenics:

Paul J. Maddon, M.D., Ph.D.
Chairman and CEO 
- ---------------------------

777 Old Saw Mill River Road 
- ---------------------------

Tarrytown, NY 10591
- ----------------------------

<PAGE>


                                   Page 15

If To PerImmune:

Michael G. Hanna, Jr.
- ------------------------

President & CEO
1330 Piccard Drive
- ------------------------

Rockville, MD 20850
- ------------------------

     8.12  SURVIVAL. The representations, warranties, covenants and 
agreements made herein shall survive any investigation made by a Party and 
shall be able to be relied fully on by the Parties.

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be 
signed by their respective corporate officers, duly authorized as of the day 
and year first above written. PerImmune, Inc., represents and warrants that 
it has the right and authority to provide to Progenics the material and 
rights set forth in this agreement pursuant to the transfer of relevant right 
and authority from Akzo Nobel to PerImmune.

PERIMMUNE, INC.                                PROGENICS PHARMACEUTICALS, INC.

By: /s/ Michael G. Hanna, Jr.                       By: Paul J. Maddon
- ----------------------------                        ----------------------

Name: Michael G. Hanna, Jr.                         Name: Paul J. Maddon
- ---------------------------                          -----------------------
Title: President & CEO                              Title: Chairman and CEO
- ---------------------------                          -----------------------


<PAGE>

As set forth in this Exhibit A, the following are the specifications for the 
Manufacture of KLH, as may from time to time be required by the Food and Drug 
Administration (the "Specifications").


<PAGE>


                                  EXHIBIT A
                                                             ORGANON TEKNIKA
                                  [GRAPHIC] AKZO
                          CERTIFICATE OF ANALYSIS
                         KEYHOLE LIMPET HEMOCYANIN


[***]















































[***] Confidential Treatment Requested


<PAGE>

                                                                   Exhibit 10.21


This document, when properly executed, shall constitute a Supply Agreement
between Progenics Pharmaceuticals, Inc. with offices at Old Saw Mill River Road,
Tarrytown, NY, (Progenics) and E.I. Du Pont de Nemours and Company (Du Pont),
with offices at 549 Albany Street, Boston, MA.

1.   PERIOD OF AGREEMENT:  July 1, 1993 through June 30, 1996.  After the
original term, this Agreement will renew automatically for successive 12 month
periods unless either party gives notice to the other of its intention not to
renew at least 120 days prior to the expiration of the then current term.

2.   MATERIAL:  Recombinant Soluble sCD4, referred to hereafter as sCD4 or
Product.

3.   MATERIAL SPECIFICATIONS:  Material shall be supplied in the form and
manner, and must conform in all material respects to the specifications set out
in Attachment A.  Alterations to these specifications require the express
written consent of each party.

4.   [***]

5.   PAYMENT TERMS:  Net 30 Days, following the receipt of a properly prepared
and correct invoice.

6.   QUANTITY:  Du Pont commits to purchase 100% of its purchase requirements
for sCD4 during the term of this order from Progenics, and Progenics agrees to
supply 100% of Du Pont's purchase requirements.

7.   DELIVERY TERMS:  F.O.B. Destination, freight collect.

8.   RELEASES:  Du Pont will advise Progenics of its purchase requirements at
least quarterly, or as may otherwise suit the parties by agreement.  Progenics
shall ship product as required by Du Pont according to a mutually agreed upon
schedule.  Progenics shall advise Du Pont at its earliest opportunity if it is
unable to ship Product at an agreed upon time.  Progenics will, on a best effort
basis, attempt to fulfill any unscheduled, or spot requirements of Du Pont.

9.   LABELLING AND PACKAGING:  Both Du Pont's and Progenics' names and logos
shall appear on the main product label and on promotional literature, along with
the following statement:  "Manufactured by Progenics Pharmaceuticals, Inc."


[***] Confidential Treatment Requested

<PAGE>

                                       -2-


All labels to be approved by both parties.  All product labelling and literature
shall contain the phrase "For Laboratory Use."  Progenics will package product
as 100 micrograms per vial, or in other package sizes as mutually agreed upon by
both parties.  Product will be shipped on dry ice.  In parallel, Progenics will
perform stability studies on lyophilized product.  Shelf life of the sCD4 will
be no less than 6 months upon receipt by Du Pont.

10.  CONFIDENTIALITY:  The parties hereto shall keep confidential all
confidential technical information, shall not disclose or make known to any
individual, firm, or corporation, except when authorized in writing to do so by
the other party, and shall not use such information for any purpose other than
the performance of the obligations provided in this Agreement.  The provisions
of this clause shall remain binding for five (5) years after the termination of
this agreement.  Each party shall use the same degree of care to avoid
disclosure of confidential technical information as the party employs with
similar information of its own which it does not desire to publish or disclose.
Any confidential information shared between the parties must be identified and
labeled in writing as confidential.  The confidentiality of and information
disclosed verbally must be identified in writing as confidential no more than 14
days after disclosure.

This obligation shall not apply to information and/or documents which:

A)   Are or come within the public domain otherwise than as a consequence of a
breach of the obligations hereunder;

B)   Are known to the receiving party prior to disclosure by the other party as
shown by the receiving party's records;

C)   Are lawfully disclosed to the receiving party by third parties; or

D)   Are subsequently independently developed by the receiving party through no
reference whatsoever to disclosure hereunder.

11.  WARRANTY:  Progenics warrants the packaged product hereunder shall meet the
specifications set forth in Attachment A and shall be free from defects except
those caused by misuse or mishandling occurring after such delivery.  Progenics
agrees to notify Du Pont prior to

<PAGE>

                                       -3-


making any formulation changes in the Product.  Progenics further warrants that
packaged product will meet the warranty of merchantability and fitness for
intended use.  In the event of a recall of Product, Progenics agrees to
reimburse Du Pont for all reasonable costs incurred in the recall.

12.  USE OF MATERIAL:  Progenics shall supply Du Pont sCD4 to be sold by Du Pont
to third parties.  The material will be used only for research purposes and not
for other uses such as clinical diagnostics or therapeutic development.  This
Agreement is limited to resale of sCD4 as packaged at Progenics and does not
allow Du Pont to modify sCD4 or combine sCD4 with other components.


[***]



[***] Confidential Treatment Requested

<PAGE>


                                       -4-


13.  RELATIONSHIP OF THE PARTIES:  Nothing contained herein shall be construed
to empower either party to act as agent for the other.  The parties agree that
each of them shall, in relation to its obligations hereunder, be acting as an
independent contractor.  Not withstanding, neither party shall, during the
period of this Agreement, enter into discussions nor create an alternative
arrangement with any third party concerning the subject matter herein, without
first advising the other party of its intent.

14.  AUDITS:  Progenics shall permit no less frequently than once per year, and
upon reasonable notice by Du Pont, inspections and audits by Du Pont during
regular business hours of all records and aspects of sCD4 manufacture, testing,
packaging, labeling and shipping.

15.  CANCELLATIONS:  This Agreement may be cancelled by either party upon 120
days written notice to the other party.

16.  ENTIRETY:  This Agreement, together with the Attachments specifically 
referenced and attached hereto, embodies the entire understanding between Du 
Pont and Progenics, and there are no contracts, warranties, or 
representations, oral or written, express or implied, with reference to the 
subject matter hereof which are not merged herein.  Except as otherwise 
specifically stated, no modification hereto shall be of any force or effect 
unless reduced to writing and signed by both parties and expressly referred 
to as being modifications of this Agreement.

AGREED & APPROVED:

FOR PROGENICS:                          FOR DU PONT:

Name Paul J. Maddon, M.D., Ph.D.        Name: Robert M. Hand
    -------------------------------          ------------------------------

Title Chairman and CEO                  Title: Senior Purchasing Agent
     ------------------------------           -----------------------------

Signature: /s/ Paul J. Maddon           Signature: /s/ Robert M. Hand
          -------------------------               -------------------------

Date: November 3, 1993                  Date: October 27, 1993
     ------------------------------          ------------------------------

<PAGE>

                                 ATTACHMENT "A"

                           PRODUCT SPECIFICATION SHEET

PRODUCT:            Recombinant Soluble CD4

PRODUCT             Full-length extracellular domain of human CD4
DESCRIPTION:        produced in a CHO expression system.

CONCENTRATION:      GREATER THAN = 1.0 mg/ml

AMOUNT              GREATER THAN = 100 micrograms/vial

STORAGE BUFFER:     50 mM MES, pH 6.0, 0.35M NaCl

SHIP:               DRY ICE

STORE:              -80 DEG. C

STABILITY:          6 months at -80 DEG. C


QUALITY CONTROL

CONCENTRATION       Determined by Optical Density and
AND PURITY:         SDS-PAGE/Silver stain (Purity GREATER THAN 95%)

AUTHENTICITY:       Reactive with gp 120 and anti-CD4 monoclonal and
                    polyclonal antibodies.

                    Glycosylation pattern identical to natural
                    human product.

ACTIVITY:           Binds HIV gp 120; inhibits binding of HIV to CD4+
                    lymphocytes and infection of CD4+ lymophoeytes with
                    HIV.
<PAGE>

[LETTERHEAD]

Reference is made to the Agreement entered into the 3rd day of November, 1993,
as amended between NEN Life Science Products, a division of E.I. DuPont de
Nemours and Company (NEN) and Progenics Pharmaceuticals, Inc. (Progenics)
relative to the purchase of sCD4 by NEN.  It is hereby mutually agreed to
further amend the aforesaid Agreement in the following manner effective July 1,
1996.

This amendment is being made to update pricing for a three year period as
follows:


            [***]


All other terms and conditions of the current Agreement, except as modified in
the above manner, shall continue in full force and effect.  Please indicate your
acceptance of this amendment by signing both copies in the space provided below
and return the copy marked "NEN M&L Copy" to Judy Lima-Ziegler, E.I.DuPont de
Nemours and Company, Purchasing Department, 549 Albany Street, Boston, MA 02118,
keeping the original for your files.


                                                               Very truly yours,


ProgensPharmaceuticals, Inc.            NEN LIFE SCIENCE PRODUCTS

BY:                                     BY: /s/ Robert M. Hand

TITLE: SR DIRECTOR, GRP. DEV.           TITLE: Sr. Purchasing Agent
                                              -----------------------------

DATE: June 26, 1996                     DATE: June 13, 1996
                                             ------------------------------


[*** Confidential Treatment Requested]


<PAGE>

   
<TABLE>
<CAPTION>

                                                                                                                        EXHIBIT 11.1


                                                 PROGENICS PHARMACEUTICALS, INC.
                                           STATEMENT OF COMPUTATION OF LOSS PER SHARE


                                                                         Year Ended December 31,
                                         -------------------------------------------------------------------------------------------
                                                     1993                          1994                            1995
                                         ---------------------------  -----------------------------  -------------------------------
                                             Primary     Fully Diluted     Primary     Fully Diluted      Primary     Fully Diluted
                                         -------------  -------------  -------------  --------------  -------------  ---------------
<S>                                      <C>            <C>            <C>            <C>             <C>              <C>
Net loss                                 $(2,394,617)   $(2,394,617)   $(3,411,734)   $(3,411,734)    $(4,503,496)    $(4,503,496)

Interest expense recognized in
  connection with convertible debt
  assumed to have been converted                                                                                           23,671

Reduction of net loss assuming a
  portion of the proceeds from the
  exercise of options and warrants
  was used to repay a term note and
  capital lease obligations and to
  invest in short-term government
  securities in accordance with the
  treasury stock method                                      42,700                       365,597                         312,360
                                         -------------------------------------------------------------------------------------------

Net loss                                 $(2,394,617)   $(2,351,917)   $(3,411,734)   $(3,046,137)    $(4,503,496)    $(4,167,465)
                                         -------------------------------------------------------------------------------------------
                                         -------------------------------------------------------------------------------------------

Weighted average number of
  common shares outstanding                2,249,675      2,249,675      2,249,675      2,249,675       2,264,839       2,264,839

Shares issuable upon assumed conversion
  of convertible debt and preferred
  stock                                                   2,339,948                     2,953,554                       3,272,943

Common and preferred shares
  issued within one year of
  the Company's proposed offering          1,086,747                     1,086,747                      1,071,583


Shares issuable upon exercise
  of outstanding options and
  warrants                                   355,687      1,087,748        355,687      2,462,494         355,687       2,052,306

Shares assumed to be repurchased
  under the treasury stock method           (775,519)      (449,935)      (775,519)      (449,935)       (775,519)       (458,935)
                                         -------------------------------------------------------------------------------------------

Weighted average number of
  common shares used in computing
  per share data                           2,916,590      5,227,436      2,916,590      7,215,788       2,916,590       7,131,153
                                         -------------------------------------------------------------------------------------------
                                         -------------------------------------------------------------------------------------------

Net loss per share                       $     (0.82)   $     (0.45)   $     (1.17)   $     (0.42)    $     (1.54)    $     (0.58)
                                         -------------------------------------------------------------------------------------------
                                         -------------------------------------------------------------------------------------------

</TABLE>
    

<PAGE>

   
<TABLE>
<CAPTION>
                                                                                                                        EXHIBIT 11.2


                                                                       PROGENICS PHARMACEUTICALS, INC.
                                                                STATEMENT OF COMPUTATION OF LOSS PER SHARE



                                                                          Nine Months Ended September 30,
                                          ------------------------------------------------------------------------------------------
                                                           1995                                               1996
                                          ------------------------------------------     -------------------------------------------
                                               Primary               Fully Diluted               Primary             Fully Diluted
                                          -----------------     --------------------     --------------------     ------------------
<S>                                       <C>                      <C>                      <C>                      <C>
Net loss                                  $ (3,070,640)            $ (3,070,640)            $ (3,481,574)            $ (3,481,574)


Reduction of net loss assuming a
  portion of the proceeds from the
  exercise of options and warrants
  was used to repay a term note and
  capital lease obligations and to
  invest in short-term government
  securities in accordance with the
  treasury stock method                                                 326,578                                            257,487
                                          ------------------------------------------------------------------------------------------

Net loss                                  $ (3,070,640)            $ (2,744,062)            $ (3,481,574)             $ (3,224,087)
                                          ------------------------------------------------------------------------------------------
                                          ------------------------------------------------------------------------------------------

Weighted average number of
  common shares outstanding                  2,254,784                2,254,784                2,294,675                2,294,675

Shares issuable upon assumed conversion
  of convertible debt and preferred
  stock                                                               3,230,650                                         4,152,563

Common and preferred shares issued
  within one year of the Company's
  proposed offering                          1,081,638                                         1,041,747


Shares issuable upon exercise
  of outstanding options and
  warrants                                     355,687                2,110,938                  355,687                1,993,063

Shares assumed to be repurchased
  under the treasury stock method             (775,519)                (458,935)                (775,519)                (458,935)
                                          ------------------------------------------------------------------------------------------

Weighted average number of
  common shares used in computing
  per share data                             2,916,590                7,137,437                2,916,590                7,981,366
                                          ------------------------------------------------------------------------------------------
                                          ------------------------------------------------------------------------------------------

Net loss per share                        $      (1.05)            $      (0.38)            $      (1.19)             $     (0.40)
                                          ------------------------------------------------------------------------------------------
                                          ------------------------------------------------------------------------------------------
</TABLE>
    


<PAGE>

   
<TABLE>
<CAPTION>
                                                                   EXHIBIT 11.3


                       PROGENICS PHARMACEUTICALS, INC.
              PRO FORMA STATEMENT OF COMPUTATION OF LOSS PER SHARE


                                                                                
                                                 Year Ended         Nine Months
                                                December 31,    Ended September 30,
                                                    1995               1996
                                               -------------    -------------------

<S>                                             <C>              <C>
PRO FORMA IN ACCORDANCE
  WITH THE SECURITIES AND
  EXCHANGE COMMISSION
  STAFF ACCOUNTING
  BULLETIN NO. 83


Net loss                                       $ (4,503,496)    $ (3,481,574)
                                               -------------    -------------
                                               -------------    -------------

Weighted average number
  of common shares
  outstanding                                     2,294,675        2,294,675


Shares issuable upon
  assumed conversion
  of preferred stock                              4,259,878        4,259,878

Shares issuable upon
  exercise of outstanding
  options and warrants                              355,687          355,687


Shares assumed to be
  repurchased under the
  treasury stock method                            (775,519)        (775,519)
                                               -------------    -------------

Weighted average number
  of common shares used
  in computing per share data                     6,134,721        6,134,721
                                               -------------    -------------
                                               -------------    -------------

Net loss per share                             $      (0.73)    $      (0.57)
                                               -------------    -------------
                                               -------------    -------------
</TABLE>
    



<PAGE>
                                                           Exhibit 23.1


                       CONSENT OF INDEPENDENT ACCOUNTANTS

   
We consent to the inclusion in this registration statement on Form S-1 
(Amendment No. 2) (File No. 333-13627) of our report dated October 28, 1996 
on our audits of the financial statements of Progenics Pharmaceuticals, Inc.  
We also consent to the reference to our firm under the captions "Selected 
Financial Data" and "Experts." 
    

                                        Coopers & Lybrand L.L.P.

   
New York, New York
November 8, 1996
    

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<CIK>     0000835887
<NAME> PROGENICS
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   YEAR                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1995             DEC-31-1996
<PERIOD-END>                               DEC-31-1995             SEP-30-1996
<CASH>                                             559                   1,746
<SECURITIES>                                         0                       0
<RECEIVABLES>                                        0                       0
<ALLOWANCES>                                         0                       0
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                                   690                   1,886
<PP&E>                                           2,144                   1,727
<DEPRECIATION>                                   1,178                     837
<TOTAL-ASSETS>                                   1,736                   2,841
<CURRENT-LIABILITIES>                              671                     992
<BONDS>                                              0                       0
                                0                       0
                                          5                       6
<COMMON>                                             3                       3
<OTHER-SE>                                         844                   1,659
<TOTAL-LIABILITY-AND-EQUITY>                     1,736                   2,841
<SALES>                                             50                      67
<TOTAL-REVENUES>                                   821                     426
<CGS>                                                0                       0
<TOTAL-COSTS>                                        0                       0
<OTHER-EXPENSES>                                 5,238                   3,868
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                  87                      40
<INCOME-PRETAX>                                (4,504)                 (3,482)
<INCOME-TAX>                                         0                       0
<INCOME-CONTINUING>                            (4,504)                 (3,482)
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                   (4,504)                 (3,482)
<EPS-PRIMARY>                                   (1.99)                  (1.52)
<EPS-DILUTED>                                   (0.58)                  (0.40)
        


</TABLE>


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