COULTER PHARMACEUTICALS INC
DEF 14A, 2000-04-26
PHARMACEUTICAL PREPARATIONS
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<PAGE>   1
                            SCHEDULE 14A INFORMATION
                PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


                           Filed by the Registrant [X]
                 Filed by a Party other than the Registrant [ ]

                           Check the appropriate box:

                         [ ] Preliminary Proxy Statement
        [ ] Confidential, for Use of the Commission Only (as permitted by
                                Rule 14a-6(e)(2))
                       [X] Definitive Proxy Statement
                       [ ] Definitive Additional Materials
          [ ] SOLICITING MATERIAL PURSUANT TO SECTION 240.14a-11(c) OR
                               Section 240.14a-12

                          COULTER PHARMACEUTICAL, INC.
                (Name of Registrant as Specified in Its Charter)

(Name of Person(s) Filing Proxy Statement if Other Than the Registrant)

Payment of Filing Fee (Check the appropriate box)

[X]     No fee required.
[ ]     Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

1.      Title of each class of securities to which transaction applies:

2.      Aggregate number of securities to which transaction applies:

3.      Per unit price or other underlying value of transaction computed
pursuant to Exchange Act Rule 0-11 (Set forth the amount on which the filing fee
is calculated and state how it was determined):

4.      Proposed maximum aggregate value of transaction:

5.      Total fee paid:

[ ]     Fee paid previously with preliminary materials.

[ ]     Check box if any part of the fee is offset as provided by Exchange Act
        Rule 0-11(a)(2) and identify the filing for which the offsetting fee was
        paid previously. Identify the previous filing by registration statement
        number, or the Form or Schedule and the date of its filing.

6.      Amount Previously Paid:

7.      Form, Schedule or Registration Statement No.:

8.      Filing Party:

9.      Date Filed:


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                          COULTER PHARMACEUTICAL, INC.
                             600 GATEWAY BOULEVARD
                     SOUTH SAN FRANCISCO, CALIFORNIA 94080

                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
                          TO BE HELD ON JUNE 13, 2000

TO THE STOCKHOLDERS OF COULTER PHARMACEUTICAL, INC.:

     NOTICE IS HEREBY GIVEN that the Annual Meeting of Stockholders of Coulter
Pharmaceutical, Inc., a Delaware corporation (the "Company"), will be held on
Tuesday, June 13, 2000 at 10:00 a.m. local time at the Hyatt Regency Hotel (San
Francisco Airport), 1333 Bayshore Highway, Burlingame, California 94010 for the
following purpose:

     1. To elect directors to serve for the ensuing year and until their
        successors are elected.

     2. To approve the Company's 1996 Equity Incentive Plan, as amended, to
        increase the aggregate number of shares of Common Stock authorized for
        issuance under such plan by 850,000 shares.

     3. To ratify the selection of Ernst & Young LLP as independent auditors of
        the Company for its fiscal year ending December 31, 2000.

     4. To transact such other business as may properly come before the meeting
        or any adjournment or postponement thereof.

     The foregoing items of business are more fully described in the Proxy
Statement accompanying this Notice.

     The Board of Directors has fixed the close of business on Monday, April 17,
2000, as the record date for the determination of stockholders entitled to
notice of and to vote at this Annual Meeting and at any adjournment or
postponement thereof.

                                          BY ORDER OF THE BOARD OF DIRECTORS

                                          /s/  JAMES C. KITCH
                                          James C. Kitch
                                          Secretary

South San Francisco, California
April 26, 2000

ALL STOCKHOLDERS ARE CORDIALLY INVITED TO ATTEND THE MEETING IN PERSON. WHETHER
OR NOT YOU EXPECT TO ATTEND THE MEETING, PLEASE COMPLETE, DATE, SIGN AND RETURN
THE ENCLOSED PROXY AS PROMPTLY AS POSSIBLE IN ORDER TO ENSURE YOUR
REPRESENTATION AT THE MEETING. A RETURN ENVELOPE (WHICH IS POSTAGE PREPAID IF
MAILED IN THE UNITED STATES) IS ENCLOSED FOR THAT PURPOSE. EVEN IF YOU HAVE
GIVEN YOUR PROXY, YOU MAY STILL VOTE IN PERSON IF YOU ATTEND THE MEETING. PLEASE
NOTE, HOWEVER, THAT IF YOUR SHARES ARE HELD OF RECORD BY A BROKER, BANK OR OTHER
NOMINEE AND YOU WISH TO VOTE AT THE MEETING, YOU MUST OBTAIN FROM THE RECORD
HOLDER A PROXY ISSUED IN YOUR NAME.
<PAGE>   3

                          COULTER PHARMACEUTICAL, INC.
                             600 GATEWAY BOULEVARD
                     SOUTH SAN FRANCISCO, CALIFORNIA 94080

                                PROXY STATEMENT
                       FOR ANNUAL MEETING OF STOCKHOLDERS
                                 JUNE 13, 2000

                 INFORMATION CONCERNING SOLICITATION AND VOTING

GENERAL

     The enclosed proxy is solicited on behalf of the Board of Directors of
Coulter Pharmaceutical, Inc., a Delaware corporation (the "Company"), for use at
the Annual Meeting of Stockholders to be held on June 13, 2000, at 10:00 a.m.
local time (the "Annual Meeting"), or at any adjournment or postponement
thereof, for the purposes set forth herein and in the accompanying Notice of
Annual Meeting. The Annual Meeting will be held at the Hyatt Regency Hotel (San
Francisco Airport), 1333 Bayshore Highway, Burlingame, California 94010. The
Company intends to mail this proxy statement and accompanying proxy card on or
about May 9, 2000, to all stockholders entitled to vote at the Annual Meeting.

SOLICITATION

     The Company will bear the entire cost of solicitation of proxies, including
preparation, assembly, printing and mailing of this proxy statement, the proxy
and any additional information furnished to stockholders. Copies of solicitation
materials will be furnished to banks, brokerage houses, fiduciaries and
custodians holding in their names shares of Common Stock beneficially owned by
others to forward to such beneficial owners. The Company may reimburse persons
representing beneficial owners of Common Stock for their costs of forwarding
solicitation materials to such beneficial owners. Original solicitation of
proxies by mail may be supplemented by telephone, telegram or personal
solicitation by directors, officers or other regular employees of the Company.
No additional compensation will be paid to directors, officers or other regular
employees for such services.

VOTING RIGHTS AND OUTSTANDING SHARES

     Only holders of record of Common Stock at the close of business on Monday,
April 17, 2000 will be entitled to notice of and to vote at the Annual Meeting.
At the close of business on Monday, April 17, 2000 the Company had outstanding
and entitled to vote 17,055,011 shares of Common Stock.

     Each holder of record of Common Stock on such date will be entitled to one
vote for each share held on all matters to be voted upon at the Annual Meeting.

     All votes will be tabulated by the inspector of election appointed for the
meeting, who will separately tabulate affirmative and negative votes,
abstentions and broker non-votes. Abstentions will be counted toward the
tabulation of votes cast on proposals presented to the stockholders and will
have the same effect as negative votes. Broker non-votes are counted toward a
quorum, but are not counted for any purpose in determining whether a matter has
been approved.

REVOCABILITY OF PROXIES

     Any person giving a proxy pursuant to this solicitation has the power to
revoke it at any time before it is voted. It may be revoked by filing with the
Secretary of the Company at the Company's principal executive office, 600
Gateway Boulevard, South San Francisco, California 94080, a written notice of
revocation or a duly executed proxy bearing a later date, or it may be revoked
by attending the meeting and voting in person. Attendance at the meeting will
not, by itself, revoke a proxy.
<PAGE>   4

STOCKHOLDER PROPOSALS

     The deadline for submitting a stockholder proposal for inclusion in the
Company's proxy statement and form of proxy for the Company's 2001 annual
meeting of stockholders pursuant to Rule 14a-8 of the Securities and Exchange
Commission is December 31, 2000. The deadline for submitting a stockholder
proposal or nomination for director that is not to be included in such proxy
statement and proxy is not later than the close of business April 14, 2001 nor
earlier than March 15, 2001. Stockholders are advised to review the Company's
Bylaws, which contain additional requirements with respect to advance notice of
stockholder proposals and director nominations.

                                   PROPOSAL 1

                             ELECTION OF DIRECTORS

     There are eight (8) nominees for the nine (9) Board positions presently
authorized in the Company's Bylaws. Each director to be elected will hold office
until the next annual meeting of stockholders and until his/her successor is
elected and has qualified, or until such director's earlier death, resignation
or removal. Each nominee listed below is currently a director of the Company.
Samuel R. Saks, M.D. was appointed to the Board on April 5, 2000 by the
remaining directors to fill a vacancy on the Board. Michael F. Bigham, Arnold L.
Oronsky, Ph.D., Brian G. Atwood, Joseph R. Coulter, III, Donald L. Lucas, Robert
Momsen and George J. Sella, Jr. have been elected by the stockholders. Sue Van,
who is currently on the Board, will not be standing for reelection and will
resign from the Board effective May 11, 2000.

     Shares represented by executed proxies will be voted, if authority to do so
is not withheld, for the election of the eight (8) nominees named below. In the
event that any nominee should be unavailable for election as a result of an
unexpected occurrence, such shares will be voted for the election of such
substitute nominee as management may propose. Each person nominated for election
has agreed to serve if elected and management has no reason to believe that any
nominee will be unable to serve.

     Directors are elected by a plurality of the votes present in person or
represented by proxy and entitled to vote.

    THE BOARD OF DIRECTORS RECOMMENDS A VOTE IN FAVOR OF EACH NAMED NOMINEE

NOMINEES

     The names of the nominees and certain information about them are set forth
below:

<TABLE>
<CAPTION>
          NAME              AGE             POSITION HELD WITH THE COMPANY
          ----              ---             ------------------------------
<S>                         <C>    <C>
Michael F. Bigham           42     President, Chief Executive Officer and Director
Arnold L. Oronsky, Ph.D.    59     Chairman of the Board
Brian G. Atwood             47     Director
Joseph R. Coulter, III      40     Director
Donald L. Lucas             70     Director
Robert Momsen               53     Director
George J. Sella, Jr.        71     Director
Samuel R. Saks, M.D.        55     Director
</TABLE>

     MICHAEL F. BIGHAM has served as President, Chief Executive Officer and a
director of the Company since July 1996. Mr. Bigham served as Executive Vice
President of Operations from April 1994 to June 1996 and Chief Financial Officer
from April 1989 to June 1996 at Gilead Sciences, Inc., a biotechnology company.
While at Gilead, he also served as Vice President of Corporate Development from
July 1988 to March 1992. Mr. Bigham was Co-head of Healthcare Investment Banking
for Hambrecht & Quist LLC, an investment banking firm where he was employed from
1984 to 1988. Mr. Bigham is a member of the Board of Directors of Datron
Systems, Inc., a publicly-held electronics company, LJL BioSystems, Inc., a
publicly-held scientific

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instrumentation company, IntraBiotics, a publicly-held biotechnology company and
two privately-held companies.

     ARNOLD L. ORONSKY, PH.D. has served as Chairman of the Board of Directors
of the Company since its inception in February 1995. From February 1995 to July
1996, Dr. Oronsky also served as President and Chief Executive Officer of the
Company. Since March 1994, Dr. Oronsky has been a general partner at InterWest
Partners, a private venture capital firm. From February 1997 to December 1997,
Dr. Oronsky served as President and Chief Executive Officer at Coulter Cellular
Therapies, a private biotechnology company, and is currently Chairman of the
Board. From December 1996 to May 1997, Dr. Oronsky served as Chief Executive
Officer of Dynavax Technologies, a private biotechnology company. Dr. Oronsky
continues to serve on the Board of Directors of Dynavax. From 1984 to 1994, Dr.
Oronsky served as Vice President for Discovery Research at Lederle Laboratories,
a pharmaceutical division of American Cyanamid, Inc. Dr. Oronsky has won
numerous grants and awards and has published over 125 scientific articles. Since
1988, Dr. Oronsky has served as a senior lecturer in the Department of Medicine
at John Hopkins Medical School. Dr. Oronsky is a member of the Board of
Directors of Corixa Corp., a publicly held biotechnology company.

     BRIAN G. ATWOOD has served as a director of the Company since April 1996.
From March to December 1995, Mr. Atwood was a consultant on business development
to the Company. Since November 1999, Mr. Atwood has been a Managing Director of
Versant Ventures, a private venture capital firm. Since October 1997, Mr. Atwood
also has been a General Partner of Brentwood Venture Capital, a private venture
capital firm, and since November 1995 he served as a Venture Partner at the
firm. He was a founder and served as President and Chief Executive Officer from
December 1993 to May 1995 and Vice President, Operations from July 1988 to
November 1993 of Glycomed Incorporated, a company dedicated to the discovery and
development of novel drugs based on complex carbohydrates. From January 1986 to
June 1987, Mr. Atwood was a Director at Perkin-Elmer/Cetus Instrument Systems, a
joint venture formed by Perkin-Elmer Corp. and Cetus Corporation, where he
oversaw the development and launch of three biotechnology instrument research
systems. Mr. Atwood currently serves as Chairman of one privately held company.

     JOSEPH R. COULTER, III has served as a director of the Company since
December 1996. Mr. Coulter was employed by Coulter Corporation until December
1997. Coulter Corporation was acquired by Beckman Instruments in October 1997.
During his 18 years at Coulter Corporation, Mr. Coulter was most recently a
director of Coulter Corporation, Executive Vice President, Director of
Information Systems, and Program Manager for Research and Development. Mr.
Coulter also serves as an officer of two privately held companies.

     DONALD L. LUCAS has served as a director of the Company since April 1996.
Since 1967, Mr. Lucas has been actively engaged in venture capital activities as
a private individual. Mr. Lucas currently serves as a director of Cadence Design
Systems, Inc., Macromedia, Inc., Oracle Corporation, Transcend Services, Inc.
Tricord Systems, Inc. and Preview Systems, Inc.

     ROBERT MOMSEN has served as a director of the Company since its inception
in February 1995. Since August 1982, Mr. Momsen has been a General Partner at
InterWest Partners, a private venture capital firm. From 1977 to 1981, Mr.
Momsen served as General Manager and Chief Financial Officer of Life Instruments
Corporation, a medical diagnostic imaging company that he co-founded. Mr. Momsen
currently serves as a director of ArthroCare Corp., COR Therapeutics, Inc.,
Innovasive Devices, Inc. and Urologix, Inc. Mr. Momsen also serves as a director
of several private companies.

     SAMUEL R. SAKS, M.D. has served as a director of the Company since April 5,
2000. From 1994 through the present, Dr. Saks has served as Senior Vice
President, Medical Affairs and Chief Medical Officer of ALZA Corporation, a
pharmaceutical company. Prior to that, Dr. Saks held various executive officer
positions at ALZA Corporation, Schering Plough Corp., XOMA Corporation and
Genentech, Inc. From 1987 to the present, Dr. Saks has served as Assistant
Clinical Professor of Medicine, Dept. of Medicine, Division of Oncology at the
University of San Francisco. Dr. Saks holds a B.S. in Biology from the
University of Illinois at Champaign and an M.D. with Honors from the University
of Illinois at the Medical Center, Chicago.

     GEORGE J. SELLA, JR. has served as a director of the Company since December
1996. From January 1983 to his retirement in April 1993, Mr. Sella served as
Chief Executive Officer of American Cyanamid

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Company, a chemical, agricultural and medical products company. From September
1979 to January 1991, Mr. Sella served as President of American Cyanamid. From
May 1984 to April 1993, he served as Chairman of the Board of Directors of
American Cyanamid. Mr. Sella currently serves as a director of Axa Financial
Inc. and Equitable Life Assurance Society of the United States.

BOARD COMMITTEES AND MEETINGS

     During the fiscal year ended December 31, 1999 the Board of Directors held
four (4) meetings. The Board has an Audit Committee and a Compensation
Committee.

     The Audit Committee meets with the Company's independent auditors at least
annually to review the results of the annual audit and discuss the financial
statements; recommends to the Board the independent auditors to be retained; and
receives and considers the accountants' comments as to controls, adequacy of
staff and management performance and procedures in connection with audit and
financial controls. The Audit Committee is composed of three non-employee
directors: Brian Atwood, Donald Lucas and Sue Van. The Audit Committee met twice
during such fiscal year. Sue Van will be resigning from the Board and from the
Audit Committee effective May 11, 2000 and will be replaced on the Audit
Committee by Robert Momsen.

     The Company's Board of Directors has adopted a formal Audit Committee
Charter which is attached hereto as Appendix A.

     The Compensation Committee makes recommendations concerning salaries and
incentive compensation, awards stock options to employees and consultants under
the Company's stock option plans and otherwise determines compensation levels
and performs such other functions regarding compensation as the Board may
delegate. The Compensation Committee is composed of four non-employee directors:
Arnold Oronsky, Donald Lucas, Robert Momsen and Sue Van. The Compensation
Committee met twice during such fiscal year. Sue Van will be resigning from the
Board and from the Compensation Committee effective May 11, 2000.

     During the fiscal year ended December 31, 1999, each Board member attended
75% or more of the aggregate of the meetings of the Board and of the committees
on which he/she served, held during the period for which he/she was a director
or committee member, respectively.

                                   PROPOSAL 2

             APPROVAL OF THE 1996 EQUITY INCENTIVE PLAN, AS AMENDED

     In December 1996, the Board of Directors adopted, and the stockholders
subsequently approved, the Company's 1996 Equity Incentive Plan (the "1996
Plan"). In February 1999, the Board approved, and the stockholders subsequently
approved, an amendment to the 1996 Plan, which increased the number of shares
authorized for issuance under the 1996 Plan by 2,000,000 shares, from a total of
2,800,000 shares to a total of 4,800,000 shares.

     In April 2000, the Board approved an additional amendment to the 1996 Plan,
subject to stockholder approval, to enhance the flexibility of the Board and the
Compensation Committee in granting stock options to the Company's employees. The
amendment increased the number of shares authorized for issuance under the 1996
Plan by 850,000 shares, from a total of 4,800,000 shares to a total of 5,650,000
shares. The Board adopted this amendment to ensure that the Company, as it
grows, can continue to grant stock options to employees at levels determined
appropriate by the Board and the Compensation Committee.

     At December 31, 1999, options (net of canceled or expired options) covering
an aggregate of 3,313,056 shares of the Company's Common Stock had been granted
under the 1996 Plan, and 1,486,944 shares (plus any shares that might in the
future be returned to the Plan as a result of cancellations or expiration of
options) remained available for future grant under the 1996 Plan. Options to
purchase an additional 15,000, 209,500, 17,500 and 20,000 shares were granted
under the 1996 Plan in January, February, March and April 2000, respectively.
During the last fiscal year, under the 1996 Plan, the Company granted to all
executive officers as a group options to purchase 230,000 shares at an exercise
price $22.63 per share, to all employees (excluding
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executive officers) as a group options to purchase 1,174,600 shares at exercise
prices ranging from $14.50 to $31.00 per share and to all directors who are not
officers as a group options to purchase 50,000 shares at exercise prices ranging
from $16.00 to $23.63 per share. For further information regarding stock option
grants, see "Executive Compensation -- Stock Option Grants and Exercises."
Stockholders are requested in this Proposal 2 to approve the 1996 Plan, as
amended. If the stockholders fail to approve this Proposal 2, there will only be
approximately 1,224,944 shares available for future grant under the 1996 Plan
(before accounting for canceled or expired options). The affirmative vote of the
holders of a majority of the shares present in person or represented by proxy
and entitled to vote at the meeting will be required to approve the 1996 Plan,
as amended. Abstentions will be counted toward the tabulation of votes cast on
proposals presented to the stockholders and will have the same effect as
negative votes. Broker non-votes are counted towards a quorum, but are not
counted for any purpose in determining whether this matter has been approved.

        THE BOARD OF DIRECTORS RECOMMENDS A VOTE IN FAVOR OF PROPOSAL 2

     The essential features of the 1996 Plan, as amended, are outlined below:

GENERAL

     The 1996 Plan provides for the granting to employees (including officers
and employee directors) of incentive stock options within the meaning of Section
422 of the Internal Revenue Code, as amended (the "Code"), and for the granting
of nonstatutory stock options, restricted stock purchase awards, and stock
bonuses (collectively, "Stock Awards") to employees, directors of and
consultants to the Company. To date, only stock options have been awarded under
the 1996 Plan.

PURPOSE

     The 1996 Plan was adopted to provide a means by which selected directors,
officers and employees of and consultants to the Company and its affiliates
could be given an opportunity to purchase stock in the Company, to assist in
retaining the services of employees holding key positions, to secure and retain
the services of persons capable of filling such positions and to provide
incentives for such persons to exert maximum efforts for the success of the
Company.

ADMINISTRATION

     The Company's Board of Directors has delegated administration of the 1996
Plan to the Compensation Committee (the "Committee"). The Committee membership
is intended to satisfy the provisions of Rule 16b-3 promulgated under the
Securities Exchange Act of 1934, as amended, and Code section 162(m), in each
case to the extent applicable. The Committee has the authority, subject to the
terms of the 1996 Plan, to determine the recipients and types of awards to be
granted, the terms of the awards granted, including the exercise price, number
of shares subject to the award, the exercisability thereof, and the form of
consideration payable upon exercise.

ELIGIBILITY

     Incentive stock options may be granted under the 1996 Plan only to selected
employees (including officers and directors who are salaried employees) of the
Company and its affiliates. Selected employees (including officers), directors
and consultants are eligible to receive Stock Awards (other than incentive stock
options) under the 1996 Plan.

     No incentive stock option may be granted under the 1996 Plan to any person
who, at the time of the grant, owns (or is deemed to own) stock possessing more
than 10% of the total combined voting power of the Company or any affiliate of
the Company, unless the incentive stock option exercise price is at least 110%
of the fair market value of the stock subject to the incentive stock option on
the date of grant, and the term of the option does not exceed five years from
the date of grant. The aggregate fair market value, determined at the time of
grant, of the shares of Common Stock with respect to which incentive stock
options are exercisable for

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the first time by an optionee during any calendar year (under all such plans of
the Company and its affiliates) may not exceed $100,000. No optionee shall be
eligible for option grants under the 1996 Plan covering more than 280,000 shares
of Common Stock in any calendar year.

STOCK SUBJECT TO THE 1996 PLAN

     4,800,000 shares of the Company's Common Stock are authorized for issuance
under the 1996 Plan, as amended. If options granted under the 1996 Plan expire
or otherwise terminate without being exercised, the Common Stock not purchased
pursuant to such options again becomes available for issuance under the 1996
Plan.

TERMS OF OPTIONS

     The following is a description of the permissible terms of options under
the 1996 Plan. Individual option grants may be more restrictive as to any or all
of the permissible terms described below.

     Exercise Price; Payment. The exercise price of incentive stock options
under the 1996 Plan generally may not be less than the fair market value of the
Common Stock subject to the option on the date of the option grant, and in some
cases (see "Eligibility" above), may not be less than 110% of such fair market
value. The exercise price of nonstatutory options under the 1996 Plan generally
may not be less than 85% of the fair value of the Common Stock on the date of
option grant. The exception to these general rules is when the option relates to
the assumption or substitution of another option as permitted under Section 424
of the Code.

     In the event of a decline in the value of the Company's Common Stock, the
Board has the authority to offer employees the opportunity to replace
outstanding higher priced options, whether incentive or nonstatutory, with new
lower priced options. To the extent required by Section 162(m), an option
repriced under the 1996 Plan is deemed to be canceled and a new option granted.
Both the option deemed to be canceled and the new option deemed to be granted
will be counted against the 280,000 share limitation. To date, the Company has
not repriced any outstanding options, and does not currently have any intention
of doing so.

     The exercise price of options granted under the 1996 Plan must be paid
either: (a) in cash at the time the option is exercised; or (b) at the
discretion of the Board, (i) by delivery of other Common Stock of the Company,
(ii) pursuant to a deferred payment arrangement, or (c) in any other form of
legal consideration acceptable to the Board.

     Option Exercise. Options granted under the 1996 Plan may become exercisable
in cumulative increments ("vest") as determined by the Board. Certain shares
covered by currently outstanding options under the 1996 Plan vest at the rate of
1/4 of the option total on the first anniversary of the option grant with
subsequent vesting at a rate of 1/48 per month thereafter until fully vested
during the optionee's employment or services as a consultant or a director.
Other shares covered by currently outstanding options under the 1996 Plan vest
at the rate 1/48 per month until fully vested during the optionee's employment
or services as a consultant or a director. Shares covered by options granted in
the future under the 1996 Plan may be subject to different vesting terms. The
Board has the power to accelerate the time during which an option may be
exercised. In addition, options granted under the 1996 Plan may permit exercise
prior to vesting, but in such event the optionee may be required to enter into
an early exercise stock purchase agreement that allows the Company to repurchase
shares not yet vested at their exercise price should the optionee's service to
the Company or an affiliate terminate before vesting. To the extent provided by
the terms of an option, an optionee may satisfy any federal, state or local tax
withholding obligation relating to the exercise of such option by a cash payment
upon exercise, by authorizing the Company to withhold a portion of the stock
otherwise issuable to the optionee, by delivering already-owned stock of the
Company or by a combination of these means.

     Term. The maximum term of options under the 1996 Plan is 10 years, except
that in certain cases (see "Eligibility") the maximum term is five years.
Options under the 1996 Plan terminate three months after termination of the
optionee's employment or relationship as a consultant or director of the Company
or any affiliate of the Company, unless such termination is due to such person's
disability, in which case the option may, but need not, provide that it may be
exercised at any time within twelve months of such termination or

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<PAGE>   9

for up to eighteen months if such termination is due to death. Individual
options by their terms may provide for exercise within a longer or shorter
period of time following termination of the optionee's service to the Company or
an affiliate. The option term will be extended in the event that exercise of the
option within these periods is prohibited for specified reasons.

TERMS OF STOCK BONUSES AND PURCHASES OF RESTRICTED STOCK

     Purchase Price; Payment. The Board will determine the purchase price under
each restricted stock purchase agreement, but the purchase price may not be less
than 85% of the stock's fair market value on the date the Board makes the award.
The purchase price of stock subject to a restricted stock purchase agreement
must be paid either: (i) in cash at the time of purchase; (ii) at the discretion
of the Board, according to a deferred payment or other arrangement with the
person to whom the Common Stock is sold; or (iii) in any other form of legal
consideration that may be acceptable to the Board in its discretion. Eligible
participants may be awarded stock pursuant to a stock bonus agreement in
consideration of past services actually rendered to the Company or for its
benefit.

     Repurchase. Shares of Common Stock sold or awarded under the 1996 Plan may,
but need not, be subject to a repurchase option in favor of the Company in
accordance with a vesting schedule determined by the Board. In the event a
person ceases to be an employee of or ceases to serve as a director of or
consultant to the Company or an affiliate of the Company, the Company may
repurchase or otherwise reacquire any or all of the shares of the Common Stock
held by that person that have not vested as of the date of termination under the
terms of the stock bonus or restricted stock purchase agreement between the
Company and such person.

ADJUSTMENT PROVISIONS

     If there is any change in the stock subject to the 1996 Plan or subject to
any option granted under the 1996 Plan (through merger, consolidation,
reorganization, recapitalization, stock dividend, dividend in property other
than cash, stock split, liquidating dividend, combination of shares, exchange of
shares, change in corporate structure or otherwise), the 1996 Plan and Stock
Awards outstanding thereunder will be appropriately adjusted as to the class and
the maximum number of shares subject to the 1996 Plan, the maximum number of
shares which may be granted to any person during a calendar year, and the class,
number of shares and price per share of stock subject to such outstanding Stock
Awards.

EFFECT OF CERTAIN CORPORATE EVENTS

     The 1996 Plan provides that, in the event of a dissolution or liquidation
of the Company, specified type of merger or other corporate reorganization, to
the extent permitted by law, any surviving corporation will be required to
either assume Stock Awards outstanding under the 1996 Plan or substitute similar
Stock Awards for those outstanding under such plan, or such outstanding Stock
Awards will continue in full force and effect. If any surviving corporation
declines to assume or continue Stock Awards outstanding under the 1996 Plan, or
to substitute similar Stock Awards, then the time during which such Stock Awards
may be exercised will be accelerated, the vesting of such Stock Awards will be
accelerated if so determined by the Board, and the Stock Awards terminated if
not exercised during such time.

DURATION, AMENDMENT AND TERMINATION

     The Board may suspend or terminate the 1996 Plan without stockholder
approval or ratification at any time or from time to time. Unless sooner
terminated, the 1996 Plan will terminate on December 4, 2006.

     The Board may also amend the 1996 Plan at any time or from time to time.
However, no amendment will be effective unless approved by the stockholders of
the Company within twelve months before or after its adoption by the Board if
the amendment would: (a) modify the requirements as to eligibility for
participation (to the extent such modification requires stockholder approval in
order for the 1996 Plan to satisfy Section 422 of the Code, if applicable; Rule
16b-3 ("Rule 16b-3") of the Securities Exchange Act of 1934, as amended (the
"Exchange Act"); or any Nasdaq Stock Market(R) or other securities exchange
listing requirements; (b) increase the number of shares reserved for issuance
upon exercise of options; or (c) change any other
                                        7
<PAGE>   10

provision of the Plan in any other way if such modification requires stockholder
approval in order to comply with Rule 16b-3 or satisfy the requirements of
Section 422 of the Code. The Board may submit any other amendment to the 1996
Plan for stockholder approval, including, but not limited to, amendments
intended to satisfy the requirements of Section 162(m) of the Code regarding the
exclusion of performance-based compensation from the limitation on the
deductibility of compensation paid to certain employees.

RESTRICTIONS ON TRANSFER

     Under the 1996 Plan, unless otherwise provided in the option agreement for
a non-statutory stock option, an option may not be transferred by the optionee
other than by will or by the laws of descent and distribution and during the
lifetime of the optionee, may be exercised only by the optionee except on such
terms as may be provided in the option agreement. In any case, an optionee may
designate in writing a third party who may exercise the option in the event of
the optionee's death. Rights under a stock bonus or restricted stock purchase
agreement are transferable only by will, by the laws of descent and distribution
or pursuant to a domestic relations order. Shares subject to repurchase by the
Company under an early exercise stock purchase agreement may be subject to
additional restrictions on transfer which the Board deems appropriate.

FEDERAL INCOME TAX INFORMATION

     The following is only a summary of the effect of federal income taxation
upon the optionee and the Company with respect to the grant and exercise of
options under the 1996 Plan, does not purport to be complete and does not
discuss the income tax laws of any state or foreign country in which an optionee
may reside.

     Incentive Stock Options. Incentive stock options under the 1996 Plan are
intended to be eligible for the favorable federal income tax treatment accorded
"incentive stock options" under the Code.

     There generally are no federal income tax consequences to the optionee or
the Company by reason of the grant or exercise of an incentive stock option.
However, the exercise of an incentive stock option may increase the optionee's
alternative minimum tax liability, if any.

     If an optionee holds stock acquired through exercise of an incentive stock
option for at least two years from the date on which the option is granted and
at least one year from the date on which the shares are transferred to the
optionee upon exercise of the option, any gain or loss on a disposition of such
stock will be capital gain or loss (the character of which will be determined by
the length of time the stock was held). Generally, if the optionee disposes of
the stock before the expiration of either of these holding periods (a
"disqualifying disposition"), at the time of disposition, the optionee will
realize taxable ordinary income equal to the lesser of (a) the excess of the
stock's fair market value on the date of exercise over the exercise price, or
(b) the optionee's actual gain, if any, on the purchase and sale. The optionee's
additional gain, or any loss, upon the disqualifying disposition will be a
capital gain or loss. Long-term capital gains currently are generally subject to
lower tax rates than ordinary income. The maximum capital gains rate for federal
income tax purposes is currently 20% while the maximum ordinary income rate is
effectively 39.6% at the present time. Slightly different rules may apply to
optionees who acquire stock subject to certain repurchase options or who are
subject to Section 16(b) of the Exchange Act.

     To the extent the optionee recognized ordinary income by reason of a
disqualifying disposition, the Company will generally be entitled (subject to
the requirement of reasonableness, the provisions of Section 162(m) of the Code
and the satisfaction of a tax reporting obligation) to a corresponding business
expense deduction in the tax year in which the disqualifying disposition occurs.

     Nonstatutory Stock Options. Nonstatutory stock options granted under the
1996 Plan generally have the following federal income tax consequences:

     There are no tax consequences to the optionee or the Company by reason of
the grant of a nonstatutory stock option. Upon exercise of a nonstatutory stock
option, the optionee normally will recognized taxable ordinary income equal to
the excess of the stock's fair market value on the date of exercise over the
option exercise price. Generally, with respect to employees, the Company is
required to withhold from regular wages
                                        8
<PAGE>   11

or supplemental wage payments an amount based on the ordinary income recognized.
Subject to the requirement of reasonableness, the provisions of Section 162(m)
of the Code and the satisfaction of a tax reporting obligation, the Company will
generally be entitled to a business expense deduction equal to the taxable
ordinary income realized by the optionee. Upon disposition of the stock, the
optionee will recognize a capital gain or loss equal to the difference between
the selling price and the sum of the amount paid for such stock plus any amount
recognized as ordinary income upon exercise of the option. The character of such
capital gain or loss will be determined by the length of time the stock was
held. Slightly different rules may apply to optionees who acquire stock subject
to certain repurchase options or who are subject to Section 16(b) of the
Exchange Act.

     Restricted Stock and Stock Bonuses. Restricted stock and stock bonuses that
may be granted under the 1996 Plan have the following federal income tax
consequences at this time:

     Upon acquisition of stock under a restricted stock or stock bonus award,
the recipient normally will recognize taxable ordinary income equal to the
excess of the stock's fair market value over the purchase price, if any.
However, to the extent the stock is subject to certain types of vesting
restrictions, the taxable event will be delayed until the vesting restrictions
lapse unless the recipient elects to be taxed on receipt of the stock.
Generally, with respect to employees, the Company is required to withhold from
regular wages or supplemental wage payments an amount based on the ordinary
income recognized. Subject to the requirement of reasonableness, Section 162(m)
of the Code and the satisfaction of a tax reporting obligation, the Company will
generally be entitled to a business expense deduction equal to the taxable
ordinary income realized by the recipient. Upon disposition of the stock, the
recipient will recognize a capital gain or loss equal to the difference between
the selling price and the sum of the amount paid for such stock, if any, plus
any amount recognized as ordinary income upon acquisition (or vesting) of the
stock. Such capital gain or loss will be long-term or short-term depending on
the length of time the stock was held from the date ordinary income was
measured. Slightly different rules may apply to persons who acquire stock
subject to forfeiture under Section 16(b) of the Exchange Act.

     Potential Limitation on Company Deductions. As part of the Omnibus Budget
Reconciliation Act of 1993, the U.S. Congress amended the Code to add Section
162(m), which denies a deduction to any publicly held corporation for
compensation paid to certain employees in a taxable year to the extent that
compensation exceeds $1,000,000 for a covered employee. It is possible that
compensation attributable to Stock Awards, when combined with all other types of
compensation received by a covered employee from the Company, may cause this
limitation to be exceeded in any particular year.

     Certain kinds of compensation, including qualified "performance-based
compensation," are disregarded for purposes of the deduction limitation.
Treasury regulations issued under Section 162(m) of the Code provide that
compensation attributable to stock options will qualify as performance-based
compensation, if: (i) the Stock Award plan contains a per-employee limitation on
the number of shares for which stock options may be granted during a specified
period; (ii) the per-employee limitation is approved by the stockholders; (iii)
the stock option is granted by a compensation committee comprised solely of two
or more "outside directors"; and (iv) the exercise price of the stock option is
no less than the fair market value of the stock on the date of grant. Restricted
stock and stock bonuses qualify as performance-based compensation under these
Treasury regulations only if: (i) the award is granted by a compensation
committee comprised solely of two or more "outside directors"; (ii) the award is
granted (or exercisable) only upon the achievement of an objective performance
goal established in writing by the compensation committee while the outcome is
substantially uncertain; (iii) the compensation committee certifies in writing
prior to the granting (or exercisability) of the award that the performance goal
has been satisfied; and (iv) prior to the granting (or exercisability) of the
award, stockholders have approved the material terms of the award (including the
class of employees eligible for such award, the business criteria on which the
performance goal is based, and the maximum amount (or formula used to calculate
the amount) payable upon attainment of the performance goal). Stock Awards
granted under the 1996 Plan, as amended, are intended to qualify as
performance-based compensation pursuant to Section 162(m). See "Eligibility"
above.

                                        9
<PAGE>   12

                                   PROPOSAL 3

               RATIFICATION OF SELECTION OF INDEPENDENT AUDITORS

     The Board of Directors has selected and approved Ernst & Young LLP as the
Company's independent auditors for the fiscal year ending December 31, 2000 and
has further directed that management submit the selection of independent
auditors for ratification by the stockholders at the Annual Meeting. Ernst &
Young LLP has audited the Company's financial statements since its inception in
1995. Representatives of Ernst & Young LLP are expected to be present at the
Annual Meeting, will have an opportunity to make a statement if they so desire
and will be available to respond to appropriate questions.

     Stockholder ratification of the selection of Ernst & Young LLP as the
Company's independent auditors is not required by the Company's Bylaws or
otherwise. However, the Board is submitting the selection of Ernst & Young LLP
to the stockholders for ratification as a matter of good corporate practice. If
the stockholders fail to ratify the selection, the Audit Committee and the Board
will reconsider whether or not to retain that firm. Even if the selection is
ratified, the Audit Committee and the Board in their discretion may direct the
appointment of different independent auditors at any time during the year if
they determine that such a change would be in the best interests of the Company
and its stockholders.

     The affirmative vote of the holders of a majority of the shares present in
person or represented by proxy and entitled to vote at the Annual Meeting will
be required to ratify the selection of Ernst & Young LLP. Abstentions will be
counted toward the tabulation of votes cast on proposals presented to the
stockholders and will have the same effect as negative votes. Broker non-votes
are counted towards a quorum, but are not counted for any purpose in determining
whether this matter has been approved.

        THE BOARD OF DIRECTORS RECOMMENDS A VOTE IN FAVOR OF PROPOSAL 3

                                       10
<PAGE>   13

                               EXECUTIVE OFFICERS

     The names of the executive officers and certain information about them are
set forth below:

<TABLE>
<CAPTION>
                  NAME                    AGE            POSITION HELD WITH THE COMPANY
                  ----                    ---            ------------------------------
<S>                                       <C>   <C>
Michael F. Bigham                         42    President, Chief Executive Officer and Director
Dwayne M. Elwood                          52    Senior Vice President and Chief Commercialization
                                                Officer
William G. Harris                         42    Senior Vice President and Chief Financial Officer
Arlene M. Morris                          48    Senior Vice President, Business Development
Dan Shochat, Ph.D.                        60    Senior Vice President and Chief Scientific
                                                Officer
Geoffrey T. Yarranton, Ph.D.,             48    Senior Vice President, Research and Development
</TABLE>

     MICHAEL F. BIGHAM has served as President, Chief Executive Officer and a
director of the Company since July 1996. Mr. Bigham served as Executive Vice
President of Operations from April 1994 to June 1996 and Chief Financial Officer
from April 1989 to June 1996 at Gilead Sciences, Inc., a biotechnology company.
While at Gilead, he also served as Vice President of Corporate Development from
July 1988 to March 1992. Mr. Bigham was Co-head of Healthcare Investment Banking
for Hambrecht & Quist LLC, an investment banking firm where he was employed from
1984 to 1988. Mr. Bigham is a member of the Board of Directors of Datron
Systems, Inc., a publicly-held electronics company, LJL BioSystems, Inc., a
publicly-held scientific instrumentation company, IntraBiotics, a publicly-held
biotechnology company and two privately-held companies.

     DWAYNE M. ELWOOD has served as Senior Vice President and Chief
Commercialization Officer since February 2000 and as Chief Commercialization
Officer of the Company since June 1999. From January 1999 to June 1999, Mr.
Elwood served as Chief Operating Officer and from July 1997 to December 1998,
Mr. Elwood served as Vice President, Sales and Marketing of the Company. From
May 1990 to July 1997, Mr. Elwood served as Vice President of new Product
Development and as a Management Board Member at Ortho-McNeil Pharmaceutical,
Inc., a division of Johnson & Johnson. His responsibilities at Ortho-McNeil
Pharmaceutical included the commercialization and launch of several products in
therapeutic areas, including biologicals, CNS agents, metabolic diseases and
anti-infectives. He recently managed the launch of Ultram(R), a drug for chronic
pain which is being marketed to various specialists, including oncologists. From
January 1992 to May 1990, Mr. Elwood served in various sales and marketing
management positions at Bristol-Myers Squibb, a pharmaceutical company. Mr.
Elwood received a B.S. degree in Business Administration/ Marketing from
California State University, Chico.

     WILLIAM G. HARRIS has served as Senior Vice President and Chief Financial
Officer of the Company since February 2000. From July 1996 to January 2000, Mr.
Harris served as Vice President and Chief Financial Officer. From July 1992 to
July 1996, Mr. Harris served as Director of Finance at Gilead Sciences, Inc., a
biotechnology company. While at Gilead, Mr. Harris also served as Controller and
Manager of Administration from July 1991 to July 1992, and as Assistant
Controller and Manager of Administration from October 1990 to July 1992. From
July 1988 to October 1990, he was a Staff Accountant at Ernst & Young, LLP. Mr.
Harris received a B.A. degree in Economics from the University of California,
San Diego, and an M.B.A. from the University of Santa Clara Leavey School of
Business and Administration.

     ARLENE M. MORRIS has served as Senior Vice President, Business Development
of the Company since February 2000. From October 1996 to January 2000, Ms.
Morris served as Vice President, Business Development of the Company. From April
1993 to October 1996, Ms. Morris served as Vice President, Business Development
at Scios, Inc., a biotechnology company. From November 1988 to April 1993, she
served as Vice President, Business Development at McNeil Pharmaceutical, a
subsidiary of Johnson & Johnson, where she was responsible for new product
planning and business development. Ms. Morris received a B.A. degree in Biology
and Chemistry from Carlow College.

     DAN SHOCHAT, PH.D. has served as Senior Vice President and Chief Scientific
Officer of the Company since September 1998. From March 1995 to August 1998, Dr.
Shochat was Vice President, Research and Development of the Company. From July
1988 to April 1995, Dr. Shochat served as Director of Biotechnol-

                                       11
<PAGE>   14

ogy Development at Lederle Laboratories, a pharmaceutical division of American
Cyanamid, Inc., where he was responsible for the worldwide program in monoclonal
antibodies for the treatment of cancer. He received B.S. and M.S. degrees from
Hebrew University in Israel and a Ph.D. in Biochemistry from L.S.U. Medical
School in New Orleans. Dr. Shochat is the author of 25 scientific papers on
tumor antigens and on antibodies for diagnostic and therapeutic use in cancer.

     GEOFFREY T. YARRANTON, PH.D., has served as Senior Vice President, Research
and Development of the Company since February 2000. From September 1998 to
January 2000, Dr. Yarranton served as Vice President, Research of the Company.
From 1982 to 1998, Dr. Yarranton held various positions with increasing
responsibility at CellTech Therapeutics, Ltd., a biotechnology company in the
United Kingdom. He was most recently Director of Research, where he led a staff
of 155 scientists involved in the discovery and development of noval chemical
and biological drugs, as well as the development and patenting of antibody
engineering and expression technology. While at Celltech, Dr. Yarranton also
served as Director of Biology and as Head of Molecular Genetics. From 1976 to
1979, he was a Jane Coffin Childs post-doctoral fellow at the Massachusetts
Institute of Technology. Dr. Yarranton received a Ph.D. degree in Genetics from
the National Institute for Medical Research. In 1989, Dr. Yarranton was awarded
the Society of Microbiology Colworth Prize for his work in recombinant gene
expression systems.

                                       12
<PAGE>   15

         SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

     The following table sets forth certain information regarding the beneficial
ownership of the Company's Common Stock as of December 31, 1999 by: (i) each
nominee for director; (ii) each of the executive officers named in the Summary
Compensation Table; (iii) all executive officers and directors of the Company as
a group; and (iv) all those known by the Company to be beneficial owners of more
than five percent of its Common Stock. Except as otherwise provided below, the
address of each person listed is c/o the Company, 600 Gateway Boulevard, South
San Francisco, California 94080.

<TABLE>
<CAPTION>
                                                        BENEFICIAL OWNERSHIP(1)
                                                        -----------------------
                                                        NUMBER OF    PERCENTAGE
                   BENEFICIAL OWNER                      SHARES       OF TOTAL
                   ----------------                     ---------    ----------
<S>                                                     <C>          <C>
Entities affiliated with Putnam Investments,
  Inc.(2).............................................  2,249,700      13.34%
  One Post Office Square
  Boston, MA 02109
Robert Momsen(3)......................................  1,821,144      10.80%
Entities Affiliated with InterWest Partners(3)........  1,811,144      10.74%
  3000 Sand Hill Road
  Building 3, Suite 255
  Menlo Park, CA 94025
Arnold L. Oronsky, Ph.D.(4)...........................  1,804,825      10.70%
Sue Van(5)............................................    812,182       4.82%
Joseph R. Coulter, III(6).............................    487,467       2.89%
Michael F. Bigham(7)..................................    460,066       2.73%
Brian G. Atwood(8)....................................    168,024          1%
Dan Shochat, Ph.D.(9).................................    119,183           *
Donald L. Lucas(10)...................................    100,550           *
William G. Harris(11).................................     88,995           *
Dwayne M. Elwood(12)..................................     65,350           *
George J. Sella, Jr.(13)..............................     15,000           *
Samuel M. Saks, M.D...................................          0          --
All executive officers and directors as a group (12
  persons)(14)........................................  5,942,786      35.25%
</TABLE>

- ---------------
  *  Represents beneficial ownership of less than 1% of the outstanding shares
     of the Company's Common Stock.

 (1) This table is based upon information supplied by officers, directors and
     principal stockholders and Schedules 13D and 13G, if any, filed with the
     Securities and Exchange Commission. Beneficial ownership is determined in
     accordance with the rules of the Securities and Exchange Commission and
     generally includes voting or investment power with respect to securities.
     Except as indicated by footnote, and subject to community property laws
     where applicable, the Company believes, based on information furnished by
     such persons, that the persons named in the table above have sole voting
     and investment power with respect to all shares of Common Stock shown as
     beneficially owned by them. Percentage of beneficial ownership is based on
     16,860,922 shares of Common Stock outstanding as of December 31, 1999,
     adjusted as required by rules promulgated by the SEC.

 (2) Based solely on information obtained from a filing made on Schedule 13G
     with the SEC.

 (3) Includes 1,799,825 shares held by InterWest Partners V, L.P. and 11,319
     shares held by InterWest Investors V. Mr. Momsen, a director of the
     Company, is a general partner of InterWest Management Partners V, L.P.
     which is the general partner of InterWest Partners V, L.P. Mr. Momsen is a
     general partner of InterWest Investors V. Mr. Momsen disclaims beneficial
     ownership of the shares held by InterWest Partners V, L.P. and InterWest
     Investors V except to the extent of his respective pecuniary interest
     therein. Also includes 10,000 shares of Common Stock subject to options
     exercisable within sixty days of December 31, 1999.

                                       13
<PAGE>   16

 (4) Includes 1,799,825 shares held by InterWest Partners V, L.P. Dr. Oronsky, a
     director of the Company, is a general partner of InterWest Management
     Partners V, L.P. which is the general partner of InterWest Partners V, L.P.
     Dr. Oronsky disclaims beneficial ownership of the shares held by InterWest
     Partners V, L.P. except to the extent of his pecuniary interest therein.

 (5) Includes 753,907 shares held by the Wallace H. Coulter Foundation, 18,691
     shares held by the Wallace H. Coulter Trust (Foundation), 14,871 shares
     held by the Sue Van Trust, 19,713 shares held by Northern Trust Bank of
     Florida Trustee of Sue Van IRA and 5,000 shares of Common Stock subject to
     options exercisable within sixty days of December 31, 1999. Ms. Van, a
     director of the Company, is President of the Wallace H. Coulter Foundation
     and trustee of the Wallace H. Coulter Trust (Foundation). Ms. Van disclaims
     beneficial ownership of the shares held in the Wallace H. Coulter
     Foundation and Wallace H. Coulter Trust to the extent of her pecuniary
     interest therein.

 (6) Includes 344,856 shares held by the Joseph R. Coulter, Jr. Trust and
     137,333 shares held by JRC Investment L.P. Mr. Coulter, a director of the
     Company, is co-trustee of the Joseph R. Coulter, Jr. Trust and general
     partner of JRC Investment L.P. Also includes 139 shares held by Mr.
     Coulter's wife, Susan Sekman Coulter and 5,000 shares of Common Stock
     subject to options exercisable within sixty days of December 31, 1999. Mr.
     Coulter disclaims beneficial ownership of the shares held by the Joseph R.
     Coulter, Jr. Trust, JRC Investment L.P. and Susan Sekman Coulter, except to
     the extent of his pecuniary interest therein.

 (7) Includes 181,297 shares held by The Michael F. Bigham Trust, 50,000 shares
     held by The Bigham Partnership and 78,769 shares of Common Stock subject to
     options exercisable with sixty days of December 31, 1999. Mr. Bigham, a
     director of the Company and the Company's Chief Executive Officer, is
     trustee of the Michael F. Bigham Trust.

 (8) Includes 145,981 shares held by Brentwood Associates VII, L.P. and 10,000
     shares of Common Stock subject to options exercisable within sixty days of
     December 31, 1999. Mr. Atwood, a director of the Company, is a venture
     partner of Brentwood VII Ventures, L.P., which is the general partner of
     Brentwood Associates VII, L.P. Mr. Atwood disclaims beneficial ownership of
     the shares held by Brentwood Associates VII, L.P., except to the extent of
     his pecuniary interest therein.

 (9) Includes 90,705 shares of Common Stock subject to options exercisable
     within 60 days of December 31, 1999.

(10) Includes 37,244 shares held by the Donald L. Lucas & Lygia S. Lucas Trust.
     Donald L. Lucas, a director of the Company, is trustee of the Donald L.
     Lucas & Lygia S. Lucas Trust. Also includes 44,379 shares held by The
     Donald L. Lucas Profit Sharing Trust, 4,333 shares held by Coral Management
     Partners IV Escrow FBO Donald L. Lucas and 10,000 shares of Common Stock
     subject to options exercisable within sixty days of December 31, 1999.

(11) Includes 87,917 shares of Common Stock subject to options exercisable
     within sixty days of December 31, 1999.

(12) Includes 60,812 shares of Common Stock subject to options exercisable
     within sixty days of December 31, 1999.

(13) All 15,000 shares of Common Stock are subject to options exercisable within
     sixty days of December 31, 1999.

(14) Includes 5,935,580 shares held by directors and executive officers of the
     Company, and entities and persons affiliated therewith. Also includes
     378,203 shares of Common Stock subject to options exercisable within sixty
     days of December 31, 1999. See Notes (2) through (14) above.

                                       14
<PAGE>   17

                             EXECUTIVE COMPENSATION

COMPENSATION OF DIRECTORS

     Directors currently do not receive any cash compensation from the Company
for their services as members of the Board of Directors, although they are
eligible for reimbursement for certain expenses incurred in connection with
attendance at Board and Committee meetings in accordance with Company policy. In
February 1999, Mr. Sella was granted options to purchase 5,000 shares of the
Company's Common Stock, which were issued under the 1996 Equity Incentive Plan.
The fair market value of such Common Stock on the date of grant was $23.63 per
share (based on the closing sales price reported on the Nasdaq Stock Market for
the date of grant). In November 1999, Dr. Oronsky, Mr. Atwood and Mr. Lucas were
each granted options to purchase 10,000 shares of the Company's Common Stock and
Mr. Coulter, Mr. Sella and Ms. Van were each granted options to purchase 5,000
shares of the Company's Common Stock, all of which were issued under the 1996
Equity Incentive Plan. The fair market value of such Common Stock on the date of
grant was $16.00 per share (based on the closing sales price reported on the
Nasdaq Stock Market for the date of grant). Options granted to directors under
the 1996 Equity Incentive Plan are intended not to qualify as incentive stock
options under the Code. As of April 12, 2000, none of the options granted to Dr.
Oronsky, Mr. Atwood, Mr. Coulter, Mr. Lucas, and Mr. Sella had been exercised.

                       COMPENSATION OF EXECUTIVE OFFICERS

SUMMARY OF COMPENSATION.

     The following table shows for the fiscal years ended December 31, 1999,
1998 and 1997, compensation awarded or paid to, or earned by, the Company's
Chief Executive Officer and its three most highly compensated executive officers
at December 31, 1999 (the "Named Executive Officers").

                           SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                                                            LONG-TERM
                                                                                           COMPENSATION
                                                      ANNUAL COMPENSATION                  ------------
                                        ------------------------------------------------    SECURITIES
                                                                         OTHER ANNUAL       UNDERLYING
     NAME AND PRINCIPAL POSITION        YEAR   SALARY($)   BONUS($)   COMPENSATION($)(1)    OPTIONS(#)
     ---------------------------        ----   ---------   --------   ------------------   ------------
<S>                                     <C>    <C>         <C>        <C>                  <C>
Michael F. Bigham(2)                    1999   $405,000    $160,000        $ 70,000(2)       125,000
  President and Chief                   1998    350,000      75,000          70,000(2)        80,000
  Executive Officer                     1997    320,000     100,000         240,869(2)       100,000
Dwayne M. Elwood(3)                     1999    252,500      75,000               0           35,000
  Senior Vice President and Chief
  Commercialization Officer
Dan Shochat, Ph.D.                      1999    225,000      65,000               0           35,000
  Senior Vice President and             1998    201,667      30,000               0           35,000
  Chief Scientific Officer              1997    182,754      38,000               0           30,000
William G. Harris                       1999    201,750      70,000               0           35,000
  Senior Vice President and             1998    190,000      30,000               0           35,000
  Chief Financial Officer               1997    170,000      30,000               0           27,500
</TABLE>

- ---------------
(1) As permitted by rules promulgated by the SEC, no amounts are shown for
    "perquisites," where such amounts for each named executive officer do not
    exceed the lesser of 10% of the sum of such executive's bonus plus salary or
    $50,000.

(2) Mr. Bigham joined the Company as its President and Chief Executive Officer
    in July 1996. The 1997 amount represents $157,500 related to a stock bonus
    grant contingent upon certain performance-based conditions and $83,369
    related to certain forgiveness of a home loan. The 1998 amount represents
    $70,000 related to certain forgiveness of a home loan. The 1999 amount
    represents $70,000 related to certain forgiveness of a home loan.

                                       15
<PAGE>   18

(3) Mr. Elwood joined the Company in July 1997 and has been serving as an
    executive officer since June 1999.

                       OPTION GRANTS IN LAST FISCAL YEAR

     The Company grants options to its executive officers pursuant to its 1996
Equity Incentive Plan. As of April 12, 2000, 3,215,503 shares were outstanding
under the 1996 Equity Incentive Plan and 1,358,565 shares remained available for
grant thereunder.

     The following table sets forth, for the fiscal year ended December 31,
1999, certain information regarding options granted to, exercised by, and held
at year-end by the Named Executive Officers:

<TABLE>
<CAPTION>
                                                       INDIVIDUAL GRANTS               POTENTIAL REALIZABLE
                                            ---------------------------------------      VALUE AT ASSUMED
                             NUMBER OF      PERCENTAGE OF                              ANNUAL RATES OF STOCK
                             SECURITIES         TOTAL                                 PRICE APPRECIATION FOR
                             UNDERLYING        OPTIONS       EXERCISE                     OPTION TERM(4)
                              OPTIONS         GRANTED IN       PRICE     EXPIRATION   -----------------------
          NAME             GRANTED(#)(1)    FISCAL 1998(2)   ($/SH)(3)      DATE        5%($)        10%($)
          ----             --------------   --------------   ---------   ----------   ----------   ----------
<S>                        <C>              <C>              <C>         <C>          <C>          <C>
Michael F. Bigham........     125,000            8.9%         $22.63      6/24/09     $1,781,725   $4,496,719
Dwayne M. Elwood.........      35,000            2.5%          22.63      6/24/09     $  498,883   $1,259,083
Dan Shochat, Ph.D........      35,000            2.5%          22.63      6/24/09     $  498,883   $1,259,083
William G. Harris........      35,000            2.5%          22.63      6/24/09     $  498,883   $1,259,083
</TABLE>

- ---------------
(1) Options granted in 1999 generally vest over four years, with 1/48 vesting in
    each month, with full vesting occurring on the fourth anniversary date of
    the grant. Pursuant to Executive Severance Benefits Agreements described
    below, the options granted to Mr. Elwood, Dr. Shochat and Mr. Harris will be
    credited with an additional eighteen (18) months of vesting in the event
    such executive's employment is involuntarily terminated without cause or
    voluntarily terminated due to a "constructive termination" in the event of a
    change in control of the Company.

(2) Based on an aggregate of 1,404,600 options granted to employees in 1999,
    including the Named Executive Officers.

(3) The exercise price per share of each option was equal to the fair market
    value of the common stock on the date of grant, as determined by the board
    of directors.

(4) The potential realizable value is calculated by assuming that the stock
    price on the date of grant as determined by the board of directors
    appreciates at the indicated annual rate compounded annually for the entire
    term of the option (ten years) and the option is exercised and sold on the
    last day of its term for the appreciated stock price. The 5% and 10% assumed
    rates of appreciation are mandated by the rules of the Securities and
    Exchange Commission and do not represent the company's estimate or
    projection of the future common stock price.

                                       16
<PAGE>   19

AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR AND FISCAL YEAR-END OPTION
VALUES

     The following table sets forth for each of the Named Executive Officers the
shares acquired and the value realized on the exercise of stock options during
the fiscal year ended December 31, 1999 and the number and value of securities
underlying unexercised options held by the Named Executive Officers at December
31, 1999:

<TABLE>
<CAPTION>
                                                           NUMBER OF SECURITIES
                                                          UNDERLYING UNEXERCISED         VALUE OF UNEXERCISED
                                                                OPTIONS AT              IN-THE-MONEY OPTIONS AT
                              SHARES         VALUE         DECEMBER 31, 1999(#)         DECEMBER 31, 1999($)(1)
                           ACQUIRED ON      REALIZED    ---------------------------   ---------------------------
          NAME             EXERCISE(#)        ($)       EXERCISABLE   UNEXERCISABLE   EXERCISABLE   UNEXERCISABLE
          ----            --------------   ----------   -----------   -------------   -----------   -------------
<S>                       <C>              <C>          <C>           <C>             <C>           <C>
Michael F. Bigham.......          0                 0      68,519        236,481      $1,022,764     $1,928,173
Dwayne M. Elwood........          0                 0      54,288        121,722      $  534,280     $  522,079
Dan Shochat, Ph.D. .....          0                 0     107,664         92,335      $2,675,436     $1,093,285
William G. Harris.......      1,000        $19,625.00      81,368         98,464      $1,456,395     $  678,922
</TABLE>

- ---------------
(1) Based on the fair market value of $22.69 per share on December 31, 1999, as
    determined by the closing sales price reported on the Nasdaq Stock Market
    minus the exercise price multiplied by the number of shares underlying the
    option.

EMPLOYMENT AGREEMENTS

     In March 1996, Michael F. Bigham, Chief Executive Officer and President of
the Company, purchased 400,000 shares of Common Stock at $0.45, the fair market
value of such shares, and purchased the shares by delivering a promissory note
in the amount of $180,000. The Company has a right to repurchase these shares in
the event Mr. Bigham's employment is terminated. Such repurchase right lapses
over a four-year period which may be accelerated if Mr. Bigham's employment is
involuntarily terminated for a reason other than gross misconduct. Such
repurchase right lapsed in full in March 2000. If the Company terminates Mr.
Bigham's employment for any reason other than gross misconduct, the Company will
continue to pay his salary and provide full benefits for one year after such
termination. In the event of a change in control of the Company, Mr. Bigham will
receive severance equal to at least two years salary plus a 30% bonus and full
benefits for two years. In addition, all repurchase right expirations will be
accelerated in full. In July 1996, the Company entered into an agreement with
Mr. Bigham pursuant to which he repaid an outstanding loan to the Company in the
amount of $180,000 and obtained from the Company a home loan in the amount of
$280,000, which new loan is secured by a second deed of trust on his principal
residence. This loan will be forgiven semiannually at the rate of 12.5% per
semiannual period so long as Mr. Bigham remains employed by the Company. At
December 31, 1999, $70,000 remained outstanding on such loan from the Company.
If Mr. Bigham's employment is terminated, interest shall commence and begin to
accrue at the prime rate plus two percentage points and will become due and
payable within 60 days of his termination. If Mr. Bigham's employment is
terminated for any reason other than gross misconduct or death, the principal of
such loan shall become due upon the earlier of Mr. Bigham securing other
employment or the date 60 days from the date of his termination. In the event of
a change in control of the Company, the remaining balance on the home loan will
be forgiven.

EMPLOYMENT SEVERANCE AND CHANGE OF CONTROL AGREEMENTS

EXECUTIVE SEVERANCE BENEFITS AGREEMENTS

     On February 28, 2000, the Compensation Committee of the Board of Directors
of the Company authorized the Company to enter into Executive Severance Benefits
Agreements with three of the Company's named executive officers. The names and
positions of the three officers are set forth below. The form of Executive
Severance Benefits Agreements approved by the Compensation Committee provides
that an executive will receive benefits if the executive's employment is
involuntarily terminated without "cause" or if the executive voluntarily
terminates employment due to a "constructive termination," in either case within
thirteen (13) months following the effective date of a "change in control" of
the Company. The benefits provided under the Executive Severance Agreements
include salary continuation for a period of eighteen (18) months and a

                                       17
<PAGE>   20

single lump-sum payment of an additional amount, prorated for the severance
period, equal to twenty-five percent (25%) of the greater of the executive's
base salary during the last regular payroll period immediately preceding the
change in control or the executive's annual base salary on the date of
termination of employment. The Company will continue to pay the employer portion
of the executive's group health insurance coverage for the executive and the
executive's eligible dependents for a period of eighteen (18) months, and the
Company will pay the cost of an executive assistance program if the executive
enrolls in such a program within six (6) months following termination of
employment. In addition, the executive generally will be credited with eighteen
(18) additional months of vesting in his or her options to purchase shares of
Common Stock of the Company. In order to receive benefits under an Executive
Severance Benefits Agreement, the executive must execute an effective release of
all claims the executive may have against the Company.

<TABLE>
<CAPTION>
         NAME                                    POSITION
         ----                                    --------
<S>                      <C>
Dwayne M. Elwood         Senior Vice President and Chief Commercialization Officer
William G. Harris        Senior Vice President and Chief Financial Officer
Dan Shochat, Ph.D.       Senior Vice President and Chief Scientific Officer
</TABLE>

REPORT OF THE COMPENSATION COMMITTEE OF THE BOARD OF DIRECTORS ON EXECUTIVE
COMPENSATION(1)

     The Compensation Committee of the Board of Directors (the "Committee") is
composed of four non-employee directors: Arnold Oronsky, Donald Lucas, Robert
Momsen and Sue Van. Sue Van will not be standing for reelection as a director
and will be resigning from the Board and the Compensation Committee effective as
of May 11, 2000. The Committee is responsible for recommending and administering
the Company's policies governing employee compensation and for administering the
Company's employee benefit plans, including its stock plans. The Committee
evaluates the performance of management, recommends compensation policies and
levels, and makes recommendations concerning salaries and incentive
compensation. The full Board of Directors reviews the Committee's
recommendations regarding the compensation of the executive officers of the
Company.

     The Company's executive compensation program is designed to attract and
retain executives capable of leading the Company to meet its business objectives
and to motivate them to enhance long-term stockholder value. The key elements of
the program are competitive pay and equity incentives, with an emphasis on
equity incentives. Annual compensation for the Company's executive officers
consists of base salary, bonuses and stock option grants.

     The Committee makes compensation determinations based upon a subjective
assessment of a variety of factors, both personal and corporate, in evaluating
the performance of the Company's executive officers and making compensation
decisions. These factors include, in order of importance, the progress of the
Company toward its long term objectives, the individual contributions of each
officer to the Company, and the compensation paid by selected biotechnology
companies to individuals in comparable positions. The Committee's weighing of
these factors in determining the compensation of an individual executive officer
may vary, and the Committee does not apply specific guidelines.

     At this point in the Company's evolution, the measures the Committee looks
to in evaluating the Company's progress are the timing and results of the
Company's clinical trials of its initial product, success in the preclinical and
clinical development of additional products, the effectiveness with which
management identifies and secures strategic opportunities to fully exploit its
current intellectual property assets and to obtain access to additional such
assets, the ability of management to secure financing for the Company's
operations, the efficient utilization of corporate resources, and the hiring and
retention of subordinate officers and other key employees best capable of
accomplishing the foregoing.

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

(1) The material in this report is not "soliciting material," is not deemed
     filed with the SEC and is not to be incorporated by reference in any filing
     of the Company under the Securities Act of 1933, as amended (the "1993
     Act"), whether made before or after the date hereof and irrespective of any
     general incorporation language in any filing.
                                       18
<PAGE>   21

     In June 1999 and August 1999, the Committee met to consider the
compensation of the Company's executive officers for the next twelve-month
period. The Committee considered a variety of factors, both individual and
corporate, in evaluating the performance of the Company's executive officers.
The Committee reviewed an analysis of compensation done by an independent
compensation consulting group with regard to compensation, including
equity-based incentives, at a select group of companies. In addition, the
Committee reviewed the results of other independent surveys that provided
information regarding management compensation for approximately 200 companies in
the biopharmaceutical industry, categorized by geographic area and management
position. The surveys include a broader group of companies than those companies
included in the NASDAQ Pharmaceutical Index used in the performance measurement
comparison graph included in this proxy statement. The Committee also reviewed
other publicly available information, gathered informally, pertaining to
compensation of executive officers in the biopharmaceutical industry. Generally,
the Committee targeted compensation to result in base salaries that were at the
high-mid-range of competitive salary levels.

     As a result of the review, the committee approved an increase in Mr.
Bigham's salary of approximately 16% for the twelve-month period commencing July
1999, reflecting in part the committee's assessment of Mr. Bigham's
contributions to the progress of the Company during his tenure as President and
Chief Executive Officer, as well as competitive considerations. In particular,
the Committee took into account progress made in the continued development of
Bexxar(TM), evaluating and negotiating with potential marketing partners as well
as Mr. Bigham's achievements in recruiting individuals to serve in key positions
in the Company and in financing the Company. Similar factors accounted for the
increases in the base salaries of the other executive officers for the same
period.

     During 1999, the Board provided stock options to the executive officers of
the Company pursuant to the 1996 Equity Incentive Plan. The exercise price of
the option grants were equal to the fair market value of the Company's Common
Stock on the date of grant. The executive officers received stock options for a
total of 230,000 shares during 1999.

     Section 162(m) of the Code limits the Company to a deduction for federal
income tax purposes of not more than $1 million of compensation paid to certain
executive officers in a taxable year. Compensation above $1 million may be
deducted if it is "performance-based compensation" within the meaning of the
Code. The Board of Directors has not yet established a policy for determining
which forms of incentive compensation awarded to executive officers shall be
designed to qualify as performance-based compensation.

                                          ARNOLD ORONSKY
                                          DONALD LUCAS
                                          ROBERT MOMSEN
                                          SUE VAN

COMPENSATION COMMITTEE OF THE COMPANY

     Arnold Oronsky, Donald L. Lucas, Robert Momsen and Sue Van. Sue Van will
not be standing for reelection as a director, and will be resigning from the
Board and the Compensation Committee effective as of May 11, 2000.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

     Prior to the formation of the Compensation Committee in October 1996, the
Board of Directors made all determinations with respect to executive officer
compensation. Of the current and former directors who participated in
deliberations concerning executive officer compensation, either prior to the
formation of the Compensation Committee or in their capacity as a member of the
Compensation Committee, Dr. Oronsky served as acting President and Chief
Executive Officer of the Company from February 1995 to June 1996, Ms. Bobbie
Wallace served as Vice President, Operations of the Company from February 1995
to March 1997 and Mr. Bigham has served as President and Chief Executive Officer
of the Company since July 1996. Each of the Company's directors has purchased
securities of the Company individually or through an affiliated entity. See
"Certain Transactions" and "Security Ownership of Certain Beneficial Owners and
Management."
                                       19
<PAGE>   22

                       PERFORMANCE MEASUREMENT COMPARISON

     The following graph compares total stockholder returns of the Company since
its initial public offering of Common Stock on January 28, 1997 to two indices:
the NASDAQ CRSP Total Return Index for the NASDAQ Stock Market (U.S. companies)
(the "NASDAQ-US") and the NASDAQ Pharmaceutical Index (the
"NASDAQ-Pharmaceutical"). The total return for the Company's stock and for each
index assumes the reinvestment of dividends, although dividends have never been
declared on the Company's stock, and is based on the returns of the component
companies weighted according to their capitalizations as of the end of each
monthly period. The NASDAQ-US tracks the aggregate price performance of equity
securities of U.S. companies traded on the NASDAQ National Market (the "National
Market"). The NASDAQ-Pharmaceutical tracks the aggregate price performance of
equity securities of pharmaceutical companies traded on the National Market. The
Company's Common Stock is traded on the National Market and is a component of
both the NASDAQ-US and the NASDAQ-Pharmaceutical.

           COMPARISON OF CUMULATIVE TOTAL RETURN ON INVESTMENT SINCE
          THE COMPANY'S INITIAL PUBLIC OFFERING ON JANUARY 28, 1997(2)

                               PERFORMANCE GRAPH

<TABLE>
<CAPTION>
                                                 COULTER PHARMACEUTICAL             NASDAQ-US             NASDAQ-PHARMACEUTICAL
                                                 ----------------------             ---------             ---------------------
<S>                                             <C>                         <C>                         <C>
1/28/97                                                  100.000                     100.000                     100.000
3/31/97                                                   76.042                      90.231                      90.744
6/30/97                                                   81.250                     106.760                      97.963
9/30/97                                                  111.458                     124.827                     109.838
12/31/97                                                 168.750                     116.901                      98.662
3/31/98                                                  228.125                     136.812                     108.455
6/30/98                                                  253.125                     140.570                     100.366
9/30/98                                                  207.292                     126.940                      94.687
12/31/98                                                 250.000                     164.728                     125.511
3/31/99                                                  181.250                     184.265                     137.730
6/30/99                                                  188.025                     201.608                     140.161
9/30/99                                                  116.150                     206.206                     160.167
12/31/99                                                 189.067                     297.600                     234.539
</TABLE>

(2) Shows the cumulative total return on investment assuming an investment of
    $100 in each of the Company, the NASDAQ-US and the NASDAQ-Pharmaceutical on
    January 28, 1997. The cumulative total return on the Company's stock has
    been computed based on an initial price of $12.00 per share, the price at
    which the Company's shares were sold in its initial public offering on
    January 28, 1997.

                              CERTAIN TRANSACTIONS

     In June 1999, the Company granted Mr. Bigham, Mr. Elwood, Mr. Harris and
Dr. Shochat, officers of the Company, options to purchase 125,000, 35,000,
35,000 and 35,000 shares of common stock, respectively. Such options have an
exercise price of $22.63 per share and vest over a four-year period.

     In February, 1999, Mr. Harris exercised options to purchase 1,000 shares of
the Company's Common Stock at $0.75 per share, with a net value realized the
difference between the exercise price and the fair market value of such shares,
based on the closing sales price and reported on the Nasdaq National Market for
the date of exercise of $19,625.

                                       20
<PAGE>   23

     In September 1998, the Company entered into an agreement with Mr. Harris
pursuant to which he obtained from the Company a home loan in the amount of
$100,000, which is secured by a second deed of trust on his principal residence.
Ten percent of this loan will be forgiven annually beginning in the sixth year
of the loan period so long as Mr. Harris remains employed by the Company. If Mr.
Harris' employment is terminated, interest shall commence and begin to accrue at
the prime rate plus two percentage points and such interest and the outstanding
principal will become due and payable within 90 days of his termination.

     In July 1997, the Company entered into an agreement with Mr. Elwood
pursuant to which he obtained from the Company a home loan in the amount of
$200,000, which is secured by a second deed of trust on his principal residence.
The entire loan will be forgiven at the end of the tenth year of employment. If
Mr. Elwood's employment is terminated, interest shall commence and begin to
accrue at the prime rate plus two percentage points and such interest and the
outstanding principal will become due and payable within 90 days of his
termination.

     As permitted by the Delaware General Corporation Law (the "Delaware Law"),
the Company's Certificate of Incorporation provides that no director of the
Company will be personally liable to the Company or its stockholders for
monetary damages for breach of fiduciary duty as a director, except (i) for any
breach of the directors' duty of loyalty to the Company or its stockholders,
(ii) for acts or omissions not in good faith or involving intentional misconduct
or a knowing violation of law, (iii) unlawful payments of dividends or unlawful
stock repurchases or redemptions, or (iv) for any transaction from which the
director derives any improper personal benefit. In addition, the Company's
Bylaws provide that the Company shall indemnify any director and may indemnify
any officer, to the fullest extent permitted by the Delaware Law, who was or is
a party or is threatened to be made a party to any action or proceeding by
reason of his or her services to the Company.

     The Company has entered into indemnity agreements with each of its
directors and executive officers which provide, among other things, that the
Company will indemnify each of them against expenses and losses incurred for
claims brought against them by reason of their being a director or executive
officer of the Company. In addition, the Company has purchased directors' and
officers' liability insurance. There is no pending litigation or proceeding
involving a director or officer of the Company as to which indemnification is
being sought, nor is the Company aware of any pending or threatened litigation
that may result in claims for indemnification by any director or executive
officer.

            SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

     Section 16(a) of the Exchange Act of 1934 requires the Company's directors
and executive officers, and persons who beneficially own more than ten percent
of a registered class of the Company's equity securities, to file with the SEC
initial reports of ownership and reports of changes in ownership of Common Stock
and other equity securities of the Company. Officers, directors and greater than
ten percent stockholders are required by SEC regulation to furnish the Company
with copies of all Section 16(a) forms they filed.

     To the Company's knowledge, based solely on a review of the copies of such
reports furnished to the Company and written representations that no other
reports were required, during the fiscal year ended December 31, 1998, all
Section 16(a) filing requirements applicable to its officers, directors and
greater than ten percent beneficial owners were complied with.

                                       21
<PAGE>   24

                                 OTHER MATTERS

     The Board of Directors knows of no other matter that may come before the
Annual Meeting. If any other matters are properly presented at the Annual
Meeting, it is the intention of the persons named in the accompanying proxy to
vote, or otherwise to act, in accordance with their best judgment.

                                          BY ORDER OF THE BOARD OF DIRECTORS

                                          /s/ JAMES C. KITCH
                                          --------------------------------------
                                          James C. Kitch
                                          Secretary

April 26, 2000

A COPY OF THE COMPANY'S ANNUAL REPORT TO THE SECURITIES AND EXCHANGE COMMISSION
ON FORM 10-K FOR THE FISCAL YEAR ENDED DECEMBER 31, 1999 IS AVAILABLE WITHOUT
CHARGE UPON WRITTEN REQUEST TO: INVESTOR RELATIONS, COULTER PHARMACEUTICAL,
INC., 600 GATEWAY BOULEVARD, SOUTH SAN FRANCISCO, CALIFORNIA 94080.

                                       22
<PAGE>   25

                                   APPENDIX A

                            AUDIT COMMITTEE CHARTER

ORGANIZATION

     The Audit Committee shall be composed of at least three members of the
Board of Directors who are independent of the management of the Corporation and
are free of any relationship that, in the opinion of the Board of Directors,
would interfere with their exercise of independent judgment as a committee
member. All members of the Audit Committee must have a minimum level of
financial literacy, and one member must have more significant accounting or
financial expertise (as defined by NASD).

STATEMENT OF POLICY

     The Audit Committee shall provide assistance to the corporate directors in
fulfilling their responsibility to the shareholders, potential shareholders, and
investment community relating to corporate accounting, reporting practices of
the Corporation, and the quality and integrity of the financial reports of the
Corporation. In so doing, it is the responsibility of the Audit Committee to
maintain free and open means of communication between the directors, the
independent auditors, the internal auditors, and the financial management of the
Corporation.

RESPONSIBILITIES

     In carrying out its responsibilities, the Audit Committee believes its
policies and procedures should remain flexible, in order to best react to
changing conditions and to ensure to the directors and shareholders that the
corporate accounting and reporting practices of the Corporation are in
accordance with all requirements and are of the highest quality.

     In carrying out these responsibilities, the Audit Committee will:

     - Have the authority and responsibility to select, evaluate and nominate
       the outside auditor to be proposed for shareholder approval, or where
       appropriate, replace the outside auditor.

     - Confirm and assure the independence of the independent accountant,
       including a review of management consulting services and related fees
       provided by the independent accountant.

     - Obtain a formal written statement from the independent auditors annually,
       delineating relationships between the auditor and the company, and
       actively engage in dialogue with the independent auditors regarding
       matters that might reasonably be expected to affect their independence.

     - Ensure that the independent auditor conduct a SAS 71 ("Interim Financial
       Information") review and discuss with the Audit Committee the matters
       described in SAS 61 ("Communication with Audit Committees") prior to the
       filing of the Company's Form 10-Q.

     - Meet with the independent auditors and financial management of the
       Corporation to review the scope of the proposed audit for the current
       year and the audit procedures to be utilized, and at the conclusion
       thereof review such audit, including any comments or recommendations of
       the independent auditors.

     - Review with the independent auditors, and the company's financial and
       accounting personnel, the adequacy and effectiveness of the accounting
       and financial controls of the Corporation, and elicit any recommendations
       for the improvement of such internal control procedures or particular
       areas where new or more detailed controls or procedures are desirable.
       Particular emphasis should be given to the adequacy of such internal
       controls to expose any payments, transactions, or procedures that might
       be deemed illegal or otherwise improper.

     - Report annually in the Company's proxy disclosing whether:

      1. The Audit Committee has reviewed and discussed the audited financial
         statements with management and discussed certain matters with the
         independent auditors;

                                       A-1
<PAGE>   26

      2. The Audit Committee has received the letter from the independent
         auditors required by Independence Standards Board Standard No. 1,
         "Independence Discussions with Audit Committees," and has discussed
         with the independent auditor the independent auditor independence; and

      3. Based on the review and discussions referred to above, the Audit
         Committee recommended to the Board of Directors that the audited
         financial statements be included in the Company's Annual Report on Form
         10-K for filing with the Commission.

     - Provide sufficient opportunity for the internal and independent auditors
       to meet with the members of the Audit Committee without members of
       management present. Among the items to be discussed in these meetings are
       the independent auditors' evaluation of the Corporation's financial,
       accounting, and auditing personnel, and the cooperation that the
       independent auditors received during the course of the audit.

     - Submit the minutes of all meetings of the Audit Committee to, or discuss
       the matters discussed at each committee meeting with, the Board of
       Directors.

     - Investigate any matter brought to its attention within the scope of its
       duties, with the power to retain outside counsel for this purpose if, in
       its judgment, that is appropriate.

     - Disclose in annual proxy that the Audit Committee has adopted a written
       charter, and has fulfilled its responsibilities under that charter during
       the latest fiscal year. The charter will be included as an appendix to
       the proxy at least once every three years.

     - Review and reassess the adequacy of the Audit Committee Charter on an
       annual basis.

                                       A-2
<PAGE>   27


                          COULTER PHARMACEUTICAL, INC.
                    PROXY SOLICITED BY THE BOARD OF DIRECTORS
                     FOR THE ANNUAL MEETING OF STOCKHOLDERS
                           TO BE HELD ON JUNE 13, 2000

The undersigned hereby appoints Michael F. Bigham and William G. Harris, and
each of them, as attorneys and proxies of the undersigned, with full power of
substitution, to vote all of the shares of stock of Coulter Pharmaceutical, Inc.
which the undersigned may be entitled to vote at the Annual Meeting of
Stockholders of Coulter Pharmaceutical, Inc. to be held the Hyatt Regency Hotel
(San Francisco Airport), 1333 Bayshore Highway, Burlingame, California 94010 on
June 13, 2000, at 10:00 a.m. local time, and at any and all postponements,
continuations and adjournments thereof, with all powers that the undersigned
would possess if personally present, upon and in respect of the following
matters and in accordance with the following instructions, with discretionary
authority as to any and all other matters that may properly come before the
meeting.

UNLESS A CONTRARY DIRECTION IS INDICATED, THIS PROXY WILL BE VOTED FOR ALL
NOMINEES LISTED IN PROPOSAL 1 AND FOR PROPOSALS 2 AND 3, AS MORE SPECIFICALLY
DESCRIBED IN THE PROXY STATEMENT. IF SPECIFIC INSTRUCTIONS ARE INDICATED, THIS
PROXY WILL BE VOTED IN ACCORDANCE THEREWITH.

MANAGEMENT RECOMMENDS A VOTE FOR THE NOMINEES FOR DIRECTOR LISTED BELOW.

PROPOSAL 1:    To elect eight (8) directors to hold office until the next Annual
Meeting of Stockholders and until their successors are elected.

<TABLE>

<S>                                            <C>
[ ] FOR all nominees listed below (except as   [ ] WITHHOLD AUTHORITY to vote for all
    marked to the contrary below)                  nominees listed below
</TABLE>

NOMINEES:   Michael F. Bigham, Arnold L. Oronsky, Brian G. Atwood, Joseph R.
            Coulter III, Donald L. Lucas, Robert Momsen, Samuel R. Saks, M.D.
            and George J. Sella, Jr.

    TO WITHHOLD AUTHORITY TO VOTE FOR ANY NOMINEE(S), WRITE SUCH NOMINEE(S)'
                                  NAME(S) BELOW

                            (Continued on other side)

<PAGE>   28

                           (Continued from other side)

MANAGEMENT RECOMMENDS A VOTE FOR PROPOSAL 2.

PROPOSAL 2:    To approve the Company's 1996 Equity Incentive Plan, as
               amended, to increase the aggregate number of shares of Common
               Stock authorized for issuance under such plan by 850,000 shares.

                      FOR              AGAINST              ABSTAIN
                      [ ]                [ ]                  [ ]

MANAGEMENT RECOMMENDS A VOTE FOR PROPOSAL 3.

PROPOSAL 3:    To ratify selection of Ernst & Young LLP as independent
               auditors of the Company for its fiscal year ending December 31,
               2000.

                      FOR              AGAINST              ABSTAIN
                      [ ]                [ ]                  [ ]



SIGNATURE(S)
            -----------------------------------------------------------

        DATED                              , 2000
             ------------------------------

Please sign exactly as your name appears hereon. If the stock is registered in
the names of two or more persons, each should sign. Executors, administrators,
trustees, guardians and attorneys-in-fact should add their titles. If signer is
a corporation, please give full corporate name and have a duly authorized
officer sign, stating title. If signer is a partnership, please sign in
partnership name by authorized person.

PLEASE VOTE, DATE AND PROMPTLY RETURN THIS PROXY IN THE ENCLOSED RETURN ENVELOPE
WHICH IS POSTAGE PREPAID IF MAILED IN THE UNITED STATES.






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