SUGEN INC
DEF 14A, 1998-04-17
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                            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 ss. 240.14a-11(c) or ss. 240.14a-12


                                  SUGEN, 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.
[ ]  $125 per Exchange Act Rules 0-11(c)(1)(ii),  14a-6(i)(1), or 14a-6(j)(2) or
     Item 22(a)(2) of Schedule 14A.
[ ]  $500 per each  party  to the  controversy  pursuant  to  Exchange  Act Rule
     14a-6(i)(3).
[ ]  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 transactions applies:


(2)  Aggregate number of securities to which transactions 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.

(1)   Amount previously paid:


(2)   Form, Schedule or Registration Statement No.:


(3)  Filing party:


(4)  Date filed:



<PAGE>


                               [SUGEN, Inc. LOGO]

                                   SUGEN, Inc.
                               351 Galveston Drive
                         Redwood City, California 94063

                                ----------------
                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
                           TO BE HELD ON MAY 20, 1998
                                ----------------

TO THE STOCKHOLDERS OF SUGEN, INC.:

     NOTICE IS HEREBY GIVEN that the Annual  Meeting of  Stockholders  of SUGEN,
INC., a Delaware corporation (the "Company"), will be held on Wednesday, May 20,
1998 at 10:00 a.m.  local time at the  offices  of the  Company,  located at 351
Galveston Drive, Redwood City, California, 94063, for the following purposes:

         1.  To elect two directors to hold office until the 2001 Annual Meeting
             of Stockholders.

         2.  To approve an amendment to the Company's 1992 Stock Option Plan, as
             amended (the "Option  Plan"),  to increase the aggregate  number of
             shares of Common Stock available for issuance under the Option Plan
             by 750,000 shares.

         3.  To  approve  an  amendment  to  the  Company's  1994   Non-Employee
             Directors' Stock Option Plan, as amended (the  "Directors'  Plan"),
             to  increase  the  aggregate  number  of  shares  of  Common  Stock
             available for issuance under the Directors' Plan by 150,000 shares.

         4.  To  ratify  the  selection  of  Ernst  & Young  LLP as  independent
             auditors of the Company  for its fiscal  year ending  December  31,
             1998.

         5.  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 March 23, 1998 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



                                          RICHARD D. SPIZZIRRI
                                          Secretary



Redwood City, California
April 17, 1998


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>


                                   SUGEN, Inc.

                               351 Galveston Drive
                         Redwood City, California 94063

                                  ------------
                                 PROXY STATEMENT
                       FOR ANNUAL MEETING OF STOCKHOLDERS
                                  May 20, 1998
                                  ------------

                 INFORMATION CONCERNING SOLICITATION AND VOTING


General

     The  enclosed  proxy is  solicited  on behalf of the Board of  Directors of
SUGEN,  Inc.,  a Delaware  corporation  (the  "Company"),  for use at the Annual
Meeting of  Stockholders  (the "Annual  Meeting") to be held on May 20, 1998, at
10:00 a.m. local time, 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  offices  of the  Company,  located  at 351
Galveston  Drive,  Redwood City,  California  94063. The Company intends to mail
this proxy statement and  accompanying  proxy card on or about April 17, 1998 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  employees  of the  Company.  No
additional  compensation will be paid to directors,  officers or other employees
for such services.

Voting Rights and Outstanding Shares

     Only  holders of record of Common  Stock at the close of  business on March
23,  1998 (the  "Record  Date") will be entitled to notice of and to vote at the
Annual  Meeting.  At the  close of  business  on the  Record  Date,  there  were
15,385,653  shares of Common Stock outstanding and entitled to vote. Each holder
of record of Common  Stock on the Record  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  towards  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 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,  351
Galveston Drive, Redwood City,  California 94063, 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>


Stockholder Proposals

     Proposals  of  stockholders  that  are  intended  to be  presented  at  the
Company's  1999 Annual Meeting of  Stockholders  must be received by the Company
not later than December 18, 1998 in order to be included in the proxy  statement
and proxy relating to that Annual Meeting.


                                   PROPOSAL 1

                              ELECTION OF DIRECTORS

     The Company's Restated Certificate of Incorporation and Bylaws provide that
the  Board  of  Directors  shall be  divided  into  three  classes,  each  class
consisting,  as  nearly  as  possible,  of  one-third  of the  total  number  of
directors,  with each class having a three-year term. Vacancies on the Board may
be filled only by persons  elected by a majority of the remaining  directors.  A
director elected by the Board to fill a vacancy  (including a vacancy created by
an increase in the size of the Board of Directors) shall serve for the remainder
of the full term of the class of  directors  in which the vacancy  occurred  and
until such director's successor is elected and qualified.

     The Board of Directors is presently  composed of eleven members,  including
two vacancies. There are two directors in the class whose term of office expires
in 1998. Each of the nominees for election to this class is currently a director
of the Company.  If elected at the Annual  Meeting,  each of the nominees  would
serve until the 2001 Annual  Meeting and until his  successor is elected and has
qualified, or until such director's earlier death, resignation or removal.

     The two vacancies on the Board of Directors  include one in the class whose
term of office expires in 1998 and one in the class whose term of office expires
in 1999.  Pursuant  to the  Company's  Bylaws,  subject to  certain  exceptions,
vacancies can be filled only by the affirmative  vote of a majority of the Board
of Directors. Accordingly, at the Annual Meeting, stockholders cannot vote for a
greater number of persons than the number of nominees named.

     Directors  are  elected by a  plurality  of the votes  present in person or
represented by proxy and entitled to vote at the meeting.  Shares represented by
executed  proxies will be voted, if authority to do so is not withheld,  for the
election of the two 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.

     Set forth below is biographical  information for each person  nominated and
each person whose term of office as a director  will  continue  after the Annual
Meeting.

Nominees  for Election for a Three-Year Term Expiring at the 2001 Annual Meeting
 
     Stephen  Evans-Freke,  46, a founder  of the  Company,  has served as Chief
Executive  Officer and Chairman of the Board of the Company since its inception.
Mr.  Evans-Freke  was also a founder of Selectide  Corporation,  a biotechnology
company based on combinatorial chemistry screening technology, and served as its
Chairman of the Board from 1990 until its  acquisition  by Marion  Merrell  Dow,
Inc.  in January  1995.  From 1976 to 1990,  Mr.  Evans-Freke  was  employed  by
PaineWebber Incorporated, a brokerage,  financial service and investment banking
company,  and served  most  recently as a member of its Board of  Directors  and
President of PaineWebber  Development  Corporation,  a subsidiary of PaineWebber
Incorporated.  He is also involved with various private companies,  serving as a
director of Pharmaceutical  Partners LLC, President of International  Technology
Investment Managers,  Inc. and Chairman of International  Technology  Investment
Managers  (Asia) Inc. He is also a director of ValiGene,  Inc., a privately held
genomics company,  and of Montier Asset Management Ltd. Mr. Evans-Freke formerly
served as a director of Genentech  Development  Corporation,  Amgen  Development
Corporation,   Centocor   Development   Corporation   and  a  number   of  other
biotechnology and high technology  companies.  Mr. Evans-Freke received a degree
in Law from the University of Cambridge.

                                        2

<PAGE>


     Axel  Ullrich,  Ph.D.,  54, a  founder  of the  Company,  has  served  as a
consultant  to the Company in his capacity as Co-Chief  Scientist and has been a
member of the Board of Directors of the Company since its inception. Since 1988,
Dr.  Ullrich has served as  Director,  Department  of  Molecular  Biology,  Max-
Planck-Institut for Biochemie, a research institute of the Max-Planck Society, a
German government-funded  organization of over eighty research institutes.  From
1982  to  1988,  Professor  Ullrich  served  in  senior  research  positions  at
Genentech.  Professor Ullrich is the 1998 recipient of the German Cancer Society
prize in recognition of his significant contributions to cancer research.


             MANAGEMENT AND THE BOARD OF DIRECTORS RECOMMEND A VOTE
                         IN FAVOR OF EACH NAMED NOMINEE.

Directors Continuing in Office Until the 1999 Annual Meeting

     Heinrich  Kuhn,  62, has served as a director of the Company since December
1991. Since 1979 he has served as Managing Director of Garching Innovation GmbH,
the technology transfer agency of the Max-Planck Society.

     Jeremy L. Curnock  Cook,  48, was appointed as a director of the Company in
December 1996. Mr. Curnock Cook has been Head of the Rothschild  Bioscience Unit
and a director of  Rothschild  Asset  Management  Limited  since  1987.  He is a
director of several British  companies,  including  International  Biotechnology
Trust plc, Biocompatibles  International plc, Therexsys Ltd. and Vanguard Medica
Group plc. He also serves on the Boards of Directors of Cell Therapeutics, Inc.,
Creative   Biomolecules,    Inc.,   Targeted   Genetics   Corp.   and   Ribozyme
Pharmaceuticals, Inc. in the United States.

     Michael A. Wall, 69, has served as a director of the Company since December
1991.  From 1979 to 1987,  when he  retired,  Mr.  Wall  served as  Chairman  of
Centocor,  Inc.,  and  continued  to serve as a member of its board of directors
until 1993. He has  participated  as a founder,  director,  or manager of over a
dozen  technology  firms  since  1955.  Mr.  Wall is also a  director  of  Kopin
Corporation and is Chairman of the Board of Directors of Alkermes, Inc.

Directors Continuing in Office Until the 2000 Annual Meeting

     Charles M.  Hartman,  56, has served as a  director  of the  Company  since
December  1991.  He has been a general  partner of CW Group,  a venture  capital
partnership,  since 1983. Mr. Hartman is a director of Ribozyme Pharmaceuticals,
Inc., Geron Corporation and several  privately-held  life sciences  companies as
well as The Hastings Center, a nonprofit  organization dedicated to the study of
ethics in medicine and life sciences.

     Donald E.  Nickelson,  65, has served as a director  of the  Company  since
October  1992.  Mr.  Nickelson  served as  President  of  PaineWebber  Group,  a
brokerage  service and investment  banking company,  from 1988 until retiring in
1990.  He also served as a director of  PaineWebber  Group from 1980 until 1993.
Mr. Nickelson serves as Vice-Chairman  and Director of Harbour Group Industries,
Inc.,  and as  Chairman  of the  Board  of  Omniquip  International,  Inc.,  Del
Industries  and Rapid  Rack  Industries.  He also  serves as  Director  of Carey
Diversified LLC and also as a Trustee of the Mainstay Mutual Funds Group.

     Bruce R. Ross,  57, was  appointed  as a director  of the Company in August
1994.  From 1980 to March 1994,  when he retired,  Mr. Ross held various  senior
management positions with Bristol-Myers Squibb, an international  pharmaceutical
company, including Vice President,  Bristol-Myers Oncology Division,  President,
U.S.  Pharmaceutical  Group  and  Senior  Vice  President,  Policy,  Planning  &
Development.  Mr. Ross is currently  the  President  of Cancer Rx and  currently
serves as a director of IDEC Corp. and the Fox Chase Cancer Center.

     Richard D.  Spizzirri,  65, has served as a director of the  Company  since
December 1991 and as Secretary  since May 1992.  Mr.  Spizzirri was a partner at
the law firm of Davis,  Polk &  Wardwell  from 1967 to  December  1994,  when he
retired.  He continues to serve as senior counsel to Davis,  Polk & Wardwell and
also serves as a director of Centocor, Inc. and Stuart Entertainment, Inc.

                                        3

<PAGE>


Honorary Member of the Board

     Joseph  Schlessinger,  Ph.D., 53, a founder of the Company, has served as a
consultant to the Company in his capacity as Co-Chief  Scientist,  as well as an
honorary member of the Board of Directors, since its inception. He has served as
a  professor  and  Chairman  of the  Department  of  Pharmacology  at  New  York
University  Medical  Center  since  1990,  and as the  Ruth  and  Leonard  Simon
Professor in Cancer  Research in the  Department  of Chemical  Immunology at the
Weizmann  Institute of Science in Rehovot,  Israel,  since 1984. He was formerly
Director of Research for Rorer Biotechnology, a biotechnology company.

Board Committees and Meetings

     During the fiscal year ended  December 31, 1997 the Board of Directors held
five  meetings.  The  Board has  delegated  certain  of its  powers to its Audit
Committee, Compensation Committee, Executive Committee and Nominating Committee.

     The Audit Committee meets with the Company's  independent auditors at least
annually to review the  results of the  Company's  annual  audit and discuss the
financial  statements;  recommends to the Board the  independent  auditors to be
retained;  and receives and  considers  the  auditors'  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: Messrs. Hartman (Chairman),  Nickelson and Spizzirri. It
met twice during 1997.

     The Compensation  Committee makes  recommendations  concerning salaries and
incentive  compensation for executive  officers,  grants stock options under the
Company's 1992 Stock Option Plan and 1995 Long-Term Objectives Stock Option Plan
for Senior Management,  determines  compensation  levels and performs such other
functions  regarding  compensation as the Board may delegate.  The  Compensation
Committee  is  currently  composed  of  three  non-employee  directors:  Messrs.
Nickelson  (Chairman),  Ross and Wall.  Mr.  Nickelson  joined the  Compensation
Committee in October 1997 following the resignation of Dr. Evnin,  who served on
the committee  until his  resignation  from the Company's  Board of Directors in
October  1997.  Mr.  Ross joined the  Compensation  Committee  in February  1998
following  the  resignation  of Mr. Utt, who served on the  committee  until his
resignation  from the Company's  Board of Directors in January 1998. In addition
to actions taken by unanimous  written consent,  the Compensation  Committee met
once during the last fiscal year.

     The  Executive   Committee   currently  consists  of  Messrs.   Evans-Freke
(Chairman),  Hartman,  Nickelson,  Ross and Spizzirri.  Mr. Spizzirri joined the
Executive Committee in February 1998 following the resignation of Dr. Evnin, who
served  on the  committee  until his  resignation  from the  Company's  Board of
Directors in October  1997.  The Board has  delegated its power and authority to
manage and operate the Company in the ordinary course of business  between Board
meetings to this  committee,  including the securing of debt financing and lease
transactions.  The Board  retains  the power to issue  shares of stock,  declare
dividends  and  adopt  certificates  of  ownership  and  merger on behalf of the
Company.  In  addition  to  actions  taken by  unanimous  written  consent,  the
Executive Committee met three times during the last fiscal year.

     The Nominating Committee was established to make recommendations concerning
nominations  of new members to the Board of  Directors.  No  procedure  has been
established for the consideration of nominees  recommended by stockholders.  The
Nominating  Committee was  established in September 1997 and is composed of four
directors:  Messrs.  Curnock Cook, Evans-Freke  (Chairman),  Nickelson and Ross.
There were no meetings in 1997.

     During the fiscal year ended  December 31, 1997,  with the exception of Mr.
Wall,  who attended  60%, all incumbent  directors  attended at least 80% of the
aggregate of the meetings held of the Board and of the  committees on which they
served during the period for which they were a director or committee member.

                                        4

<PAGE>


                                   MANAGEMENT

<TABLE>
     Executive  officers  are  appointed  annually by the Board and serve at the
discretion  of the  Board.  Set  forth  below  are  the  names  of  and  certain
biographical information concerning the executive officers of the Company.

<CAPTION>
                 Name                  Age                         Position
- ------------------------------------- -----   --------------------------------------------------
<S>                                    <C>    <C>
Stephen Evans-Freke (1) .............  46     Chief Executive Officer and Chairman of the Board
K. Peter Hirth, Ph.D ................  46     Executive Vice President and Chairman of the
                                                Research and Development Committee
Stephen K. Carter, M.D. .............  60     Senior Vice President, Clinical and Regulatory
                                                Affairs
Sara A. Courtneidge, Ph.D. ..........  44     Senior Vice President, Research
Susan M. Kanaya. ....................  35     Treasurer
Peter J. Langecker, M.D., Ph.D. .....  47     Vice President, Clinical Affairs
Gerald McMahon, Ph.D. ...............  43     Vice President, Drug Discovery
Gregory D. Plowman, M.D., Ph.D. .....  41     Vice President, Molecular Biology
Dorian Rinella ......................  49     Vice President, Human Resources
Laura K. Shawver, Ph.D ..............  40     Vice President, Preclinical and Pharmaceutical
                                                Development

<FN>
- ------------
(1)  See  "Proposal 1 -- Election of  Directors"  for  biographical  information
     concerning the Company's Chief Executive Officer and Chairman of the Board.
</FN>
</TABLE>


     K. Peter  Hirth,  Ph.D.,  Executive  Vice  President,  and  Chairman of the
Research and Development Committee,  joined the Company in March 1992. Dr. Hirth
held several  positions with Boehringer  Mannheim GmbH, a German  pharmaceutical
company,  from August 1984 to December 1991, most recently as Vice President and
Head of Immunopharmacology, Allergy, Virology and Microbiology.

     Stephen K. Carter,  M.D.,  Senior Vice  President  Clinical and  Regulatory
Affairs,  joined the  Company in January  1998.  From 1995 to 1997,  Dr.  Carter
served  as  Senior  Vice  President,  Research  and  Development  of  Boehringer
Ingelheim  Pharmaceuticals,  Inc., a pharmaceutical  company. From 1982 to 1995,
Dr.  Carter  held  several  positions  at  Bristol-Myers  Squibb  Pharmaceutical
Research  Institute,  a  pharmaceutical  company,  most  recently as Senior Vice
President,  Worldwide Clinical Research and Development.  Dr. Carter also serves
as a director of Alfacell Corporation. Dr. Carter has committed fifty percent of
his time to his SUGEN responsibilities, the balance being devoted to third party
consultancy and other interests.  Dr. Carter received his Medical Degree in 1963
from the New York Medical College.

     Sara A. Courtneidge,  Ph.D.,  Senior Vice President,  Research,  joined the
Company in November 1994. Dr. Courtneidge was employed by the European Molecular
Biology  Laboratory,  an  international  molecular  biology  research  center in
Heidelberg,  Germany, from August 1985 to September 1994, first as Group Leader,
and most recently as Senior Scientist,  Differentiation  Programme. From January
1981 to July 1985, Dr.  Courtneidge was a member of the Scientific  Staff at the
National Institute of Medical Research, London, England.

     Susan M. Kanaya,  Treasurer,  joined the Company in December  1994 and held
various  positions  with the Company prior to being  appointed an officer of the
Company in October 1997.  From July 1994 to September 1994, Ms. Kanaya served as
Business Manager of Viacom/Paramount  New Media, a software development company,
and from  July  1993 to July  1994,  she  served as  Controller  of 50/50  Micro
Electronics,  Inc., a semi-conductor  company.  From March 1990 to May 1993, Ms.
Kanaya was  employed by Power Up Software  Corporation,  a software  development
company, serving as Accounting Manager until June 1992, then as Controller until
May 1993. Ms. Kanaya also previously  served as a Supervising  Senior Accountant
of KPMG Peat Marwick.

     Peter J. Langecker,  M.D., Ph.D., Vice President,  Clinical Affairs, joined
the Company in July 1997. From July 1995 to July 1997, Dr.  Langecker  served as
Vice President, Clinical Research of Coulter

                                        5

<PAGE>


Pharmaceutical, Inc., a biotechnology company, and from March 1992 to July 1995,
he served as Director,  Clinical Research, Oncology of Schering-Plough Corp., an
international pharmaceutical company. Subsequent to receiving his Medical Degree
in 1984 and his  Doctorate  Degree in 1988 from the  University  of Munich,  Dr.
Langecker joined CIBA-GEIGY AG, an international  pharmaceutical  company, where
he served as General Medical Advisor until February 1992.

     Gerald McMahon, Ph.D., Vice President,  Drug Discovery,  joined the Company
in January  1994 and held  various  positions  with the  Company  prior to being
appointed  an officer of the  Company in January  1998.  Dr.  McMahon  served as
director of molecular oncology at Sandoz Research Institute from January 1989 to
January  1994.  From 1984 to 1989 Dr.  McMahon was  employed by the  Division of
Toxicology  and the  Department of Chemistry at MIT in Cambridge,  Massachusetts
and conducted postdoctoral research in the Department of Hematology and Oncology
at Tufts University  School of Medicine.  Dr. McMahon earned his B.S. in Biology
and his Ph.D. in Molecular Biology from the Rennsselaer Polytechnic Institute.

     Gregory D. Plowman, M.D., Ph.D., Vice President,  Molecular Biology, joined
the Company in January 1994 and held various positions with the Company prior to
being  appointed  an officer of the Company in January  1998.  Dr.  Plowman held
several  positions  at  Bristol-Myers  Squibb from 1988 to December  1993,  most
recently as head of a receptor  biology  program in the Oncology Drug  Discovery
Department.  During  this  period  he cloned  several  growth  factors  and RTKs
including  amphiregulin,  HER3 and  HER4.  He earned  his B.A.  in  Biology  and
Chemistry  from Whitman  College and his M.D. and Ph.D.  from the  University of
Washington.

     Dorian Rinella,  Vice  President,  Human  Resources,  joined the Company in
December  1991 and  held  various  positions  with  the  Company  prior to being
appointed an officer of the Company in January 1998. From 1984 to December 1991,
Ms. Rinella was employed by Doric  Development,  Inc., a real estate development
firm.

     Laura K. Shawver,  Ph.D.,  Vice President,  Preclinical and  Pharmaceutical
Development, joined the Company in June 1992 and held various positions with the
Company  prior to being  appointed  an officer of the Company in February  1997.
From August 1989 to June 1992,  Dr.  Shawver  held  several  positions at Berlex
Biosciences,  most  recently  as Director of Cell  Biology and  Immunology.  Dr.
Shawver also served as a research  associate in the Department of Hematology and
Oncology at the Jewish  Hospital at  Washington  University  from 1986 to August
1989. Dr. Shawver received her Ph.D. in Pharmacology from the University of Iowa
and completed her  postdoctoral  fellowship in the Department of Microbiology at
the University of Virginia.


                                   PROPOSAL 2

                    APPROVAL OF AN AMENDMENT TO THE COMPANY'S
                             1992 STOCK OPTION PLAN

     In February  1992,  the Board of Directors  adopted,  and the  stockholders
subsequently approved, the Company's 1992 Stock Option Plan (the "Option Plan").
As a result of a series of amendments, at December 31, 1997 there were 2,750,000
shares of the Company's  Common Stock  authorized  for issuance under the Option
Plan.

     Through March 31, 1998,  stock options (net of canceled or expired options)
covering an aggregate of 2,897,742 shares of the Company's Common Stock had been
granted under the Option Plan, of which options to purchase  147,742 shares (net
of canceled or expired  options)  are  subject to  stockholder  approval of this
Proposal 2.

     In February  1998,  the Board of  Directors  approved an  amendment  to the
Option Plan, subject to stockholder  approval, to enhance the flexibility of the
Board in granting  stock options to employees,  officers and  consultants of the
Company and its  affiliates  and to  directors  of the  Company.  The  amendment
increases the number of shares  authorized for issuance under the Option Plan by
750,000  shares,  from an aggregate of 2,750,000  shares to a total of 3,500,000
shares.  The Board  approved  this  amendment  to ensure  that the  Company  can
continue to grant stock options at levels determined appropriate by the Board.

                                        6

<PAGE>


     Stockholders  are  requested in this Proposal 2 to approve the amendment to
the Option Plan, as amended.  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 Option Plan, as amended.


                 MANAGEMENT AND THE BOARD OF DIRECTORS RECOMMEND
                         A VOTE IN FAVOR OF PROPOSAL 2.

     The essential features of the Option Plan are outlined below:

General

     Incentive  stock  options  granted  under the Option  Plan are  intended to
qualify as "incentive  stock  options"  within the meaning of Section 422 of the
Internal  Revenue Code of 1986,  as amended  (the  "Code").  Nonstatutory  stock
options  granted  under the Option Plan are intended not to qualify as incentive
stock  options  under the Code.  See  "Federal  Income  Tax  Information"  for a
discussion  of the tax treatment of the various  options  included in the Option
Plan.

Purpose

     The  Option  Plan  was  adopted  to  provide  a means  by  which  employees
(including officers and employee  directors) of and selected  consultants to the
Company and its  affiliates  and under certain  circumstances,  directors of the
Company could be given an opportunity to receive 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.  All full-time  regular  employees are eligible to  participate  in the
Option Plan.

Administration

     The Option Plan is  administered  by the Board of Directors of the Company.
The Board has the power to construe and interpret  the Option Plan and,  subject
to the  provisions  of the Option Plan, to determine the persons to whom and the
dates on which options will be granted, what type of option will be granted, the
number of shares to be subject to each option, the time or times during the term
of each option  within  which all or a portion of such option may be  exercised,
the exercise price, the type of consideration and other terms of the option. The
Board of Directors is authorized to delegate  administration  of the Option Plan
to a  committee  composed  of at least two  members of the Board.  The Board has
delegated administration of the Option Plan to the Compensation Committee of the
Board. As used herein with respect to the Option Plan, the "Board" refers to the
Compensation Committee as well as to the Board of Directors itself.

Eligibility

     Incentive  stock  options  may be  granted  under the  Option  Plan only to
employees  (including  officers and employee  directors)  of the Company and its
affiliates.   Consultants,  directors  and  employees  (including  officers  and
employee  directors) are eligible to receive  options other than incentive stock
options under the Option Plan.  Directors  who are not salaried  employees of or
consultants  to the Company or to any  affiliate of the Company are not eligible
to participate in the Option Plan.

     No option may be granted  under the Option  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 option  exercise  price is at least 110% of the fair market  value of
the stock subject to the option on the date of grant, and the term of the option
does not exceed five years from the date of grant.  For incentive  stock options
granted under the Option Plan,  the aggregate  fair market value,  determined at
the time of grant,  of the  shares of Common  Stock  with  respect to which such
options are  exercisable  for the first time by an optionee  during any calendar
year (under

                                        7

<PAGE>


all such plans of the Company and its  affiliates) may not exceed  $100,000.  No
person may be granted options  covering more than 434,527 shares of Common Stock
in any calendar year.

Stock Subject to the Incentive Plan

     Subject  to  stockholder  approval  of this  Proposal  2, an  aggregate  of
3,500,000 shares of Common Stock is reserved for issuance under the Option Plan.
If options granted under the Option Plan expire or otherwise  terminate  without
being exercised,  the Common Stock not purchased  pursuant to such options again
becomes available for issuance under the Option Plan.

Terms of Options

     The following is a description  of the  permissible  terms of options under
the Option 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 Option Plan 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 Option Plan may not be less
than 85% of 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
also not be less than 110% of such fair market value.  However,  if options were
granted with exercise  prices below market value,  deductions  for  compensation
attributable  to the exercise of such options could be limited by Section 162(m)
of the Code.  See  "Federal  Income Tax  Information."  At March 31,  1998,  the
closing price of the Company's  Common Stock as reported on the Nasdaq  National
Market System was $13.625 per share.

     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  Option  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 434,527 per person share limitation.

     The exercise  price of options  granted  under the Option 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  Option  Plan  may  become
exercisable in cumulative increments ("vest") as determined by the Board. Shares
covered by currently  outstanding  options under the Option Plan typically vest,
for an optionee's initial grant, at the rate of 25% of the shares subject to the
option on the first  anniversary of the date of the optionee's  commencement  of
employment  or  consultant  services and 1/12th of the  remaining  shares on the
first day of each quarter thereafter during the optionee's employment or service
as a consultant.  Subsequent grants to the optionee,  if any,  typically vest at
the rate of 1/16th per  quarter.  Shares  covered by options  granted  under the
Option 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 Option 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  leave the employ of the Company
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  Option  Plan is ten years,
except that in certain cases (see "Eligibility") the maximum term is five years.
Options under the Option Plan terminate  within a period  specified by the Board
(generally three months) after the optionee ceases to provide services to the

                                        8

<PAGE>


Company or any affiliate of the Company,  unless (a) the  termination of service
is due to such person's permanent and total disability (as defined in the Code),
in which case the option may, but need not,  provide that it may be exercised at
any time within twelve months of such  termination;  (b) the optionee dies while
providing  services to the Company or any  affiliate of the  Company,  or within
three months after  termination  of such service,  in which case the option may,
but need not,  provide  that it may be  exercised  (to the extent the option was
exercisable  at the time of the  optionee's  death)  within twelve months of the
optionee's death by the person or persons to whom the rights to such option pass
by will or by the laws of  descent  and  distribution;  or (c) the option by its
terms  specifically  provides  otherwise.  Individual options by their terms may
provide for exercise  within a longer period of time  following  termination  of
employment or the consulting relationship.  The option term may also be extended
in the event that exercise of the option within these periods is prohibited  for
specified reasons.

Adjustment Provisions

     If there is any change in the stock  subject to the Option  Plan or subject
to any option  granted  under the Option 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 Option Plan and options
outstanding  thereunder will be  appropriately  adjusted as to the class and the
maximum  number of shares  subject to such 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 options.

Effect of Certain Corporate Events

     The  Option  Plan  provides  for  automatic   acceleration  of  vesting  of
outstanding  options  granted  under the Option Plan in the event of a change of
control,  which includes (i) a merger or  consolidation  in which the Company is
not the surviving corporation; (ii) a reverse merger in which the Company is the
surviving  corporation but the shares of the Company's  outstanding common stock
are  converted  by virtue of the  merger  into other  property;  (iii) any other
capital  reorganization  in which more than fifty percent (50%) of the shares of
the  Company  entitled to vote are  exchanged;  (iv) a  transaction  or group of
related  transactions  involving  the  sale of all or  substantially  all of the
Company's assets; (v) certain  acquisitions by a person,  entity or group of the
beneficial  ownership of securities of the Company  representing more than fifty
percent  (50%) of the combined  voting power in the election of  directors;  and
(vi) certain changes in the composition of the Company's Board of Directors such
that,  during any  period of two  consecutive  years,  individuals  who,  at the
beginning of such period,  constitute the Board (including directors who at such
time were duly elected or nominated for election by the  Company's  stockholders
during such period),  cease for any reason to have  authority to cast at least a
majority of the votes which all directors on the Board are entitled to vote. The
acceleration  of an option in the event of an acquisition  or similar  corporate
event may be viewed as an antitakeover  provision,  which may have the effect of
discouraging a proposal to acquire or otherwise obtain control of the Company.

Duration, Amendment and Termination

     The Board may  suspend or  terminate  the Option Plan  without  stockholder
approval  or  ratification  at any  time or from  time to  time.  Unless  sooner
terminated, the Option Plan will terminate in February 2002.

     The Board may also amend the Option  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 Plan to satisfy  Section 422 of the Code, if  applicable,  or Rule
16b-3 ("Rule 16b-3")  promulgated under the Securities  Exchange Act of 1934, as
amended (the  "Exchange  Act");  (b) increase the number of shares  reserved for
issuance upon exercise of options; or (c) change any other 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  Option  Plan for  stockholder
approval, including, but not limited to, amendments intended to satisfy the

                                        9

<PAGE>


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 Option Plan, an incentive  stock option may not be transferred by
the optionee  otherwise than by will or by the laws of descent and  distribution
and, during the lifetime of an optionee,  an option may be exercised only by the
optionee.  A nonstatutory  stock option may not be transferred except by will or
by the laws of descent and  distribution  or pursuant to a  "qualified  domestic
relations  order." In addition,  any shares subject to repurchase by the Company
under an early exercise stock purchase  agreement may be subject to restrictions
on transfer which the Board deems appropriate.

Federal Income Tax Information

     Incentive Stock Options.  Incentive stock options under the Option 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 long-term  or mid-term  capital  gain or loss.  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, which will be long-term, mid-term or
short-term depending on how long the stock was held (generally, mid-term capital
gain if the stock was held more than one year but not more than eighteen  months
and  long-term  capital gain if the stock was held more than  eighteen  months).
Long-term and mid-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  28% for  mid-term  capital  gains and 20% for
long-term  capital gains 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  recognizes  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 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
Option 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 recognize  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 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 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.  Such  gain or loss  will be  long-term,
mid-term  or  short-term  depending  on how long 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.

                                       10

<PAGE>


     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 options,  when combined with all other types
of compensation received by a covered employee,  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.  In
accordance  with Treasury  regulations  issued under Section 162(m) of the Code,
compensation  attributable  to stock  options will qualify as  performance-based
compensation,  provided that the option is granted by a  compensation  committee
comprised solely of "outside directors" and either: (i) the option plan contains
a  per-employee  limitation  on the  number of shares for which  options  may be
granted during a specified  period,  the per-employee  limitation is approved by
the stockholders,  and the exercise price of the option is no less than the fair
market  value of the stock on the date of grant;  or (ii) the  option is granted
(or  exercisable)  only upon the  achievement  (as  certified  in writing by the
compensation  committee) of an objective performance goal established in writing
by the compensation committee while the outcome is substantially  uncertain, and
the  option  is  approved  by the  stockholders.  The  Option  Plan  contains  a
per-person,  per-calendar year limitation of 434,527 shares,  which was approved
by the Company's stockholders in 1995.


                                NEW PLAN BENEFITS

<TABLE>
     The following  table presents  certain  information,  as of March 31, 1998,
with  respect to options  granted  under the  Option  Plan which are  subject to
stockholder  approval,  to (i) the Named  Executive  Officers (as defined  below
under "Executive  Compensation -- Compensation of Executive  Officers") and (ii)
all  executive  officers as a group.  No  non-employee  director  was granted an
option  under the  Option  Plan in 1997 as a  director.  None of the  options to
acquire 147,742 shares of Common Stock that are subject to stockholder  approval
were granted to non-executive officers.

<CAPTION>
                                                                  1992 Stock Option Plan
                                                          ---------------------------------------
                                                                                    Number of
                                                                                Shares Subject to
                   Name and Position                       Dollar Value (1)      Options Granted
                  -------------------                     ------------------   ------------------
<S>                                                           <C>                    <C>   
Stephen Evans-Freke ...................................       $  585,000              45,000
 Chief Executive Officer and
 Chairman of the Board

K. Peter Hirth, Ph.D. .................................          325,000              25,000
 Executive Vice President and Chairman of
 the Research and Development Committee

Sara A. Courtneidge, Ph.D .............................          260,000              20,000
 Senior Vice President, Research

Gerald McMahon, Ph.D. .................................          130,000              10,000
 Vice President, Drug Discovery

Laura K. Shawver, Ph.D. ...............................          156,000              12,000
 Vice President, Preclinical and
 Pharmaceutical Development

All Executive Officers as a group (8 persons) .........        1,907,521             147,742

<FN>
- ------------
(1)  Exercise price multiplied by the number of shares underlying the option(s).
</FN>
</TABLE>

                                       11

<PAGE>


                                   PROPOSAL 3

                    APPROVAL OF AN AMENDMENT TO THE COMPANY'S
                 1994 NON-EMPLOYEE DIRECTORS' STOCK OPTION PLAN

     In  April  1994,  the  Board of  Directors  adopted,  and the  stockholders
subsequently approved,  the Company's 1994 Non-Employee  Directors' Stock Option
Plan (the "Directors' Plan"). As a result of a series of amendments, at December
31, 1997 there were 230,000 shares of the Company's  Common Stock authorized for
issuance under the Directors' Plan.

     In February 1995, the Directors' Plan was amended to increase the automatic
annual grant to each  Non-Employee  Director,  from an option to purchase  2,000
shares of Common Stock to an option to purchase 5,000 shares of Common Stock and
to  change  the  date of the  grant  from  the date of each  annual  meeting  of
stockholders, commencing with the 1996 Annual Meeting, to ten days subsequent to
each annual meeting of stockholders,  commencing with the 1995 Annual Meeting of
Stockholders.

     Through March 31, 1998,  stock options (net of canceled or expired options)
covering an aggregate of 168,000  shares of the Company's  Common Stock had been
granted under the Directors' Plan.

     In February  1998,  the Board of  Directors  approved an  amendment  to the
Directors' Plan, subject to stockholder  approval, to enhance the flexibility of
the Board in granting  stock options to persons who are directors of the Company
and who are not  employees  of the Company or of any  affiliates  ("Non-Employee
Directors").  The  amendment  increases  the  number  of shares  authorized  for
issuance  under the  Directors'  Plan by 150,000  shares,  from an  aggregate of
230,000 shares to a total of 380,000  shares.  The Board approved this amendment
to ensure  that the  Company  can  continue  to grant  stock  options  at levels
determined appropriate by the Board.

     Stockholders  are  requested in this Proposal 3 to approve the amendment to
the Directors'  Plan. The  affirmative  vote of the holders of a majority of the
shares  present in person or represented by proxy at the meeting and entitled to
vote will be required to approve the Directors' Plan.


               MANAGEMENT RECOMMENDS A VOTE IN FAVOR OF PROPOSAL 3

     The essential features of the Directors' Plan are outlined below.

General

     The Directors' Plan provides for  non-discretionary  grants of nonstatutory
stock  options to  Non-Employee  Directors  of the Company.  Nonstatutory  stock
options  granted  under the  Directors'  Plan are  intended  not to  qualify  as
"incentive  stock  options" under the Code.  See "Tax  Information"  below for a
discussion of the tax treatment of nonstatutory stock options.

Purpose

     The  Directors'  Plan was adopted to provide a means by which each director
who is not  otherwise  an employee of the Company or of any  affiliates  will be
given an  opportunity  to  purchase  stock of the  Company  and to  advance  the
interests of the Company  through the  motivation,  attraction  and retention of
qualified  Non-Employee  Directors.  All Non-Employee  Directors are eligible to
receive options under the Directors' Plan.

Administration

     The Directors' Plan is  administered  by the Board of Directors.  The Board
has the power to construe and interpret the Directors' Plan and is authorized to
delegate  administration of such plan to a committee  composed of not fewer than
two members of the Board (the  "Committee").  As used herein with respect to the
Directors'  Plan, the "Board" refers to the Committee as well as to the Board of
Directors itself.

Eligibility

     Only Non-Employee  Directors of the Company are eligible to receive options
under the Directors' Plan.

                                       12

<PAGE>


Stock Subject to the Directors' Plan

     Subject to stockholder approval of this Proposal 3, an aggregate of 380,000
shares of Common Stock is reserved for issuance  under the  Directors'  Plan. If
options granted under the Directors' Plan expire or otherwise  terminate without
having been exercised in full, the stock not purchased  pursuant to such options
again becomes available for issuance under the plan.

Terms of Options

     The following is a description of the terms of options under the Directors'
Plan.

     Non-Discretionary  Grants.  Option  grants  under the  Directors'  Plan are
automatic and non-discretionary.  The Directors' Plan provides that (i) upon the
date of the Annual Meeting of Stockholders of the Company held during 1995, each
person who is then a Non-Employee  Director and has been a Non-Employee Director
for at least  three  months  will  receive  an  automatic  grant of an option to
purchase  2,000  shares of Common  Stock  ("Initial  Grants");  (ii) each person
elected for the first time to be a  Non-Employee  Director after the adoption of
the Directors'  Plan will be granted an option on the date of his or her initial
election as a Non-Employee  Director to purchase  10,000 shares of Common Stock;
and (iii) ten days  following the date of each annual  meeting of  stockholders,
commencing with the Annual Meeting held during 1995, each Non-Employee  Director
who is  then a  Non-Employee  Director  and  who has  served  as a  Non-Employee
Director for at least three  months,  will  receive an option to purchase  5,000
shares of Common Stock.

     Option Exercise.  The Initial Grants are fully exercisable  ("vest") on the
date of grant.  Options  granted  to new  Non-Employee  Directors  vest in equal
annual  installments  over a period of five  years  from the date of the  grant.
Options granted annually to existing Non-Employee  Directors of the Company vest
in full on the date ten days  prior to the date of the first  annual  meeting of
stockholders  of the Company  subsequent  to the date of the grant.  In December
1997,  the Directors'  Plan was amended to provide that future  options  granted
under the  Directors'  Plan will allow the  optionees to exercise an option,  in
whole  or in part,  prior  to the full  vesting  of the  options,  subject  to a
repurchase right in favor of the Company as to any unvested shares.  All vesting
is subject to continued service on the Board as a Non-Employee Director.

     Exercise  Price;  Payment.  The exercise price of all options granted under
the Directors'  Plan is 100% of the fair market value of the Common Stock of the
Company  on the date on which  the  option is  granted.  The  exercise  price of
options granted under the Directors' Plan must be paid either (i) in cash at the
time the option is  exercised;  or (ii) by delivery of other Common Stock of the
Company; or (iii) by a combination of the methods of payment specified in (i) or
(ii) above.  At March 31, 1998, the closing price of the Company's  Common Stock
as reported on the Nasdaq National Market System was $13.625 per share.

     Term. The term of options under the Directors'  Plan is 10 years. An option
may  be  exercised  following   termination  of  the  optionee's  service  as  a
Non-Employee Director of the Company only for that number of shares for which it
was vested on the date of termination of such service.

Adjustment Provisions

     If there is any  change  in the stock  subject  to the  Directors'  Plan or
subject  to  any  option  granted  thereunder  (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 Directors'  Plan and
options  outstanding  thereunder will be appropriately  adjusted as to the class
and the maximum number of shares subject to such plan, and the class,  number of
shares and price per share of stock subject to any such outstanding options.

Effect of Certain Corporate Events

     The  Directors'  Plan  provides for  automatic  acceleration  of vesting of
outstanding  options  granted under the Directors' Plan in the event of a change
of control, which includes (i) a merger or consolidation in which the Company is
not the surviving corporation; (ii) a reverse merger in which the Company is the
surviving  corporation but the shares of the Company's  outstanding common stock
are converted by virtue

                                       13

<PAGE>


of the merger into other  property;  (iii) any other capital  reorganization  in
which more than fifty  percent  (50%) of the shares of the  Company  entitled to
vote  are  exchanged;  (iv) a  transaction  or  group  of  related  transactions
involving  the sale of all or  substantially  all of the Company's  assets;  (v)
certain acquisitions by a person, entity or group of the beneficial ownership of
securities  of the Company  representing  more than fifty  percent  (50%) of the
combined voting power in the election of directors;  and (vi) certain changes in
the composition of the Company's Board of Directors such that, during any period
of two  consecutive  years,  individuals  who, at the  beginning of such period,
constitute the Board (including  directors who at such time were duly elected or
nominated for election by the Company's  stockholders during such period), cease
for any reason to have  authority to cast at least a majority of the votes which
all directors on the Board are entitled to vote. The  acceleration  of an option
in the event of an  acquisition or similar  corporate  event may be viewed as an
antitakeover provision,  which may have the effect of discouraging a proposal to
acquire or otherwise obtain control of the Company.

Duration, Amendment and Termination

     Unless sooner terminated, the Directors' Plan will terminate in April 2004,
or upon the occurrence of any event  described in the preceding  paragraph.  The
Board may suspend or terminate the Directors' Plan without stockholder  approval
or ratification at any time or from time to time.

     The  Board may amend the  Directors'  Plan at any time,  provided  that the
Board shall not amend the plan more than once every six months  with  respect to
the  provisions  of the  Directors'  Plan which relate to the amount,  price and
timing of grants, other than to comport with changes in the Code or the Employee
Retirement  Income  Security  Act  ("ERISA").  However,  no  amendment  will  be
effective  unless  approved by the  stockholders of the Company within 12 months
before or after the adoption of the amendment,  where the amendment  would:  (i)
modify the  requirements as to eligibility for  participation to the extent such
modification requires stockholder approval in order for such Plan to comply with
the requirements of Rule 16b-3;  (ii) increase the number of shares reserved for
issuance  upon exercise of options,  or (iii) change any other  provision of the
Directors'  Plan in any  other  way if such  modification  requires  stockholder
approval in order to comply with Rule 16b-3.

Restrictions on Transfer

     Under the Directors' Plan, an option may not be transferred by the optionee
otherwise  than  by will or by laws of  descent  and  distribution.  During  the
lifetime of an optionee,  an option may be exercised only by the optionee, or by
his or her guardian or legal representative.

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 Directors' 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.

     Options granted under the Directors' Plan are nonstatutory  options.  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  generally will recognize  ordinary income for tax purposes measured by
the excess of the then fair market  value of the shares  over the option  price.
Because the optionee may  exercise an option as to unvested  shares,  subject to
the  Company's  repurchase  right,  the  date  of  taxation  (and  the  date  of
measurement of taxable ordinary income) may be deferred in such instances unless
the optionee  files an election under Section 83(b) of the Code. The filing of a
Section 83(b)  election with respect to the exercise of an option may affect the
time of taxation and the amount of income  recognized  at such time. At the time
the optionee  recognizes  ordinary income due to the exercise of the option, the
Company will generally be entitled to a business expense  deduction equal to the
taxable ordinary income realized by the optionee.  Upon resale of such shares by
the optionee,  any difference between the sales price and the exercise price, to
the extent not recognized as ordinary income as provided  above,  generally will
be treated as capital gain or loss,  and will qualify for  long-term or mid-term
capital  gain or loss  treatment  if the shares have been held for more than one
year.

                                       14

<PAGE>


                                NEW PLAN BENEFITS

     The following table presents certain information with respect to options to
be granted in 1998 to all Non-Employee Directors as a group under the Directors'
Plan.


                                             1994 Non-Employee Directors'
                                                   Stock Option Plan
                                        ---------------------------------------
                                                                  Number of
                                                              Shares Subject To
           Name and Position             Dollar Value (1)      Options Granted
          -------------------           ------------------   ------------------
        All Non-Employee Directors as a
         group (8 persons) ............        --                  40,000 (2)

- ------------
(1)  The  dollar  value of the  shares  subject  to options to be granted is not
     determinable at this time but will be equal to the fair market value of the
     stock subject to such option on the date of grant.
(2)  Each of the Company's eight  Non-Employee  Directors will receive an option
     to purchase  5,000 shares of the Company's  Common Stock as of the date ten
     days after the Company's 1998 Annual Meeting of Stockholders.


                                   PROPOSAL 4

                RATIFICATION OF SELECTION OF INDEPENDENT AUDITORS

     The Board of  Directors  has  selected  Ernst & Young LLP as the  Company's
independent  auditors  for the fiscal  year  ending  December  31,  1998 and has
further  directed that management  submit the selection of independent  auditors
for  ratification by the  stockholders at the Annual Meeting.  Ernst & Young LLP
began  auditing the Company's  financial  statements  with the fiscal year ended
December  31,  1992.  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.

             MANAGEMENT AND THE BOARD OF DIRECTORS RECOMMEND A VOTE
                             IN FAVOR OF PROPOSAL 4.

                                       15

<PAGE>


                              SECURITY OWNERSHIP OF
                    CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

<TABLE>
     The following table sets forth certain information  regarding the ownership
of the  Company's  Common Stock as of March 31, 1998,  by: (i) each director and
nominee for director;  (ii) each of the executive  officers named in the Summary
Compensation Table of the Company; (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.

<CAPTION>
                                                                             Beneficial Ownership (1)
                                                                             -------------------------
                                                                              Number of     Percent of
Beneficial Owner                                                                Shares        Total
- ----------------                                                             -----------   -----------
<S>                                                                           <C>               <C> 
Zeneca Limited ...........................................................    3,036,016         19.7
 15 Stanhope Gate
 London W1Y 6LN
 England
Stephen Evans-Freke (2) ..................................................      763,469          4.9
Jeremy L. Curnock Cook (3) ...............................................      751,667          4.9
Charles M. Hartman (4) ...................................................      442,049          2.9
Heinrich Kuhn (5) ........................................................       52,666           *
Donald E. Nickelson (6) ..................................................       50,999           *
Bruce R. Ross (7) ........................................................       37,000           *
Richard D. Spizzirri (8) .................................................      322,504          2.1
Axel Ullrich, Ph.D. (9) ..................................................      229,333          1.5
Michael A. Wall (10) .....................................................       65,721           *
Sara A. Courtneidge, Ph.D. (11) ..........................................       69,999           *
K. Peter Hirth, Ph.D. (12) ...............................................      166,314          1.1
Gerald McMahon, Ph.D. (13) ...............................................       24,145           *
Laura K. Shawver, Ph.D. (14) .............................................       42,072           *
All executive officers and directors as a group (19 persons) (15) ........    3,323,747         20.6

<FN>
- ----------------
*    Less than one percent.
(1)  This table is based upon  information  supplied by officers,  directors and
     principal  stockholders and Schedules 13D and 13G filed with the Securities
     and  Exchange  Commission  ("SEC").   Unless  otherwise  indicated  in  the
     footnotes  to this  table and  subject  to  community  property  laws where
     applicable,  the Company  believes that each of the  stockholders  named in
     this table has sole voting and investment  power with respect to the shares
     indicated  as  beneficially  owned.  Applicable  percentages  are  based on
     15,412,360 shares of Common Stock  outstanding on March 31, 1998,  adjusted
     as required by rules promulgated by the SEC.
(2)  Includes (i) 5,333 shares  beneficially  owned by ITIM Corp.,  of which Mr.
     Evans-Freke is a stockholder and director,  (ii) 23,424 shares beneficially
     owned by Mr.  Evans-Freke  as co-trustee of his  children's  trusts,  (iii)
     8,271  shares  owned by his  spouse,  (iv)  29,855  shares of Common  Stock
     subject to  repurchase  in favor of the  Company,  and (v)  270,000  shares
     subject to stock options  exercisable  within 60 days of March 31, 1998, of
     which 174,938 are subject to a repurchase option in favor of the Company in
     the event of early exercise.
(3)  Includes 736,667 shares  beneficially  held by International  Biotechnology
     Trust plc ("IBT") of which Mr. Curnock Cook is a director. Mr. Curnock Cook
     is a director of Rothschild Asset  Management  Limited,  the  discretionary
     investment advisor of IBT. Mr. Curnock Cook disclaims  beneficial ownership
     of the IBT shares.  Also includes  15,000  shares  subject to stock options
     exercisable  within  60 days of March 31,  1998,  of which  8,000  would be
     subject  to a  repurchase  option in favor of the  Company  in the event of
     early exercise.

                                       16

<PAGE>


(4)  Includes  306,666  shares  owned by CW R&D II  (Financial)  Fund,  L.P. and
     105,050  shares  owned by CW  Ventures  II, L.P.  Mr.  Hartman is a general
     partner of CW Partners II, L.P.  ("CWP II") and CW Partners III, L.P. ("CWP
     III"). CWP II is a general partner of CW R&D II (Financial)  Fund, L.P. CWP
     III is a general  partner of CW Ventures  II, L.P.  Mr.  Hartman  disclaims
     beneficial  ownership  of the shares  held by such  entities  except to the
     extent of his partnership  interests  therein.  Also includes 17,000 shares
     subject to stock options exercisable within 60 days of March 31, 1998.
(5)  Includes 27,000 shares subject to stock options  exercisable within 60 days
     of March 31,  1998,  of which 3,125 are subject to a  repurchase  option in
     favor of the Company in the event of an early exercise.
(6)  Includes  (i) 23,999  shares  beneficially  owned by  Nickelson  Properties
     Limited  Partnership  of which Mr.  Nickelson is a limited  partner and the
     sole shareholder and director of DN Holdings,  Inc., the general partner of
     Nickelson Properties Limited Partnership, and (ii) 27,000 shares subject to
     stock options exercisable within 60 days of March 31, 1998.
(7)  Includes 33,000 shares subject to stock options  exercisable within 60 days
     of March 31, 1998.
(8)  Includes 17,000 shares subject to stock options  exercisable within 60 days
     of March 31, 1998.
(9)  Includes 37,333 shares subject to stock options  exercisable within 60 days
     of March 31,  1998,  of which 2,813 are subject to a  repurchase  option in
     favor of the Company in the event of an early exercise.
(10) Includes  (i)  6,666  shares  registered  to Mr.  Wall  as  trustee  of his
     children's  trust account,  and (ii) 17,000 shares subject to stock options
     exercisable within 60 days of March 31, 1998.
(11) Includes 68,999 shares subject to stock options  exercisable within 60 days
     of March 31, 1998.
(12) Includes (i) 25,000 shares of Common Stock issued  subject to forfeiture at
     the option of the Company upon the  termination  of  employment  prior to a
     specified   date,   and  (ii)  105,545  shares  subject  to  stock  options
     exercisable within 60 days of March 31, 1998.
(13) Includes 14,146 shares subject to stock options  exercisable within 60 days
     of March 31, 1998.
(14) Includes 26,967 shares subject to stock options  exercisable within 60 days
     of March 31, 1998.
(15) Includes  shares held by directors and  executive  officers of the Company,
     and entities  affiliated  with such persons.  Also  includes  54,855 shares
     subject to  repurchase  or  forfeiture  in favor of the Company and 763,947
     shares  subject to stock  options held by executive  officers and directors
     exercisable  within 60 days of March 31, 1998, of which 191,688 are subject
     to a  repurchase  option  in favor  of the  Company  in the  event of early
     exercise; see Notes 2 through 14 above.
</FN>
</TABLE>


Compliance With Section 16(a) of the Securities Exchange Act of 1934

     Section 16(a) of the Securities Exchange Act of 1934 requires the Company's
directors and executive officers, and persons who 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 file.

     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,  1997,  all
Section 16(a) filing  requirements  applicable  to its  officers,  directors and
greater than ten percent beneficial owners were met.


                             EXECUTIVE COMPENSATION

Compensation of Directors

     Each of the Company's  non-employee  directors receives a fee of $1,000 for
each Board of Directors and Board committee meeting attended.  In the event that
a Board meeting and Board committee meeting are held on the same day,  directors
receive a fee for attending  only one meeting.  Non-employee  directors are also
eligible  for  reimbursement  of their  expenses  incurred  in  connection  with
attendance at meetings,

                                       17

<PAGE>


in accordance with Company policy. Directors who are employees of the Company do
not receive  separate  compensation  for their  services as  directors,  but are
eligible to receive stock options under the Company's  stock option plans.  Each
non-employee  director of the Company  receives  stock  option  grants under the
Directors'  Plan.  Only  non-employee  directors  of the Company are eligible to
receive options under the Directors' Plan.

Compensation of Executive Officers

<TABLE>
     The  following  table shows for the fiscal years ending  December 31, 1997,
1996 and 1995,  compensation  awarded or paid to, or earned  by,  the  Company's
Chief  Executive  Officer and its other four most highly  compensated  executive
officers whose total annual salary and bonuses exceeded  $100,000 for the fiscal
year ending December 31, 1997 (the "Named Executive Officers"):

<CAPTION>
                              Summary Compensation Table

                                                   Annual Compensation
                                     ------------------------------------------------
                                                                       Other Annual
     Name and Principal Position      Year     Salary       Bonus      Compensation
- ------------------------------------ ------ ------------ ----------- ----------------
<S>                                   <C>     <C>          <C>            <C>  
Stephen Evans-Freke ................  1997    $ 320,000    $110,000       $   0
 Chief Executive Officer and          1996    $ 290,000    $ 95,000       $   0
 Chairman of the Board                1995    $ 260,000    $ 84,000       $   0

K. Peter Hirth, Ph.D ...............  1997    $ 225,000    $ 47,972       $   0
 Executive Vice President and         1996    $ 197,743    $ 50,000       $   0
 Chairman of the Research and         1995    $ 161,599    $ 33,735       $   0
 Development Committee

Sara A. Courtneidge, Ph.D. .........  1997    $ 165,000    $ 31,350       $   0
 Senior Vice President, Research      1996    $ 147,700    $ 26,586       $   0
                                      1995    $ 143,458    $ 21,000       $ 925(4)

Gerald McMahon .....................  1997    $ 130,000    $ 17,550       $   0
 Vice President, Drug Discovery       1996    $ 120,350    $ 18,053       $   0
                                      1995    $ 111,300    $ 13,773       $   0

Laura K. Shawver, Ph.D. ............  1997    $ 140,000    $ 23,800       $   0
 Vice President, Preclinical and      1996    $ 116,950    $ 17,543       $   0
 Pharmaceutical Development           1995    $ 106,848    $ 13,223       $   0


                                                   Long-Term Compensation Awards
                                     ----------------------------------------------------------
                                                              Securities
                                                              Underlying
                                       Restricted Stock        Options/           All Other
     Name and Principal Position            Awards             SARs (#)         Compensation
- ------------------------------------ -------------------- ------------------ ------------------
Stephen Evans-Freke ................     $       0             45,000          $      0
 Chief Executive Officer and             $       0             45,000          $      0
 Chairman of the Board                   $       0            180,000 (1)      $      0

K. Peter Hirth, Ph.D ...............     $ 350,000(2)          75,000          $      0
 Executive Vice President and            $       0             35,000          $ 50,000(3)
 Chairman of the Research and            $       0             73,200          $      0
 Development Committee

Sara A. Courtneidge, Ph.D. .........     $       0             20,000          $      0
 Senior Vice President, Research         $       0             20,000          $      0
                                         $       0             25,000          $  3,085(4)

Gerald McMahon .....................     $       0             10,000          $      0
 Vice President, Drug Discovery          $       0              8,500          $      0
                                         $       0              8,000          $      0

Laura K. Shawver, Ph.D. ............     $       0             12,000          $      0
 Vice President, Preclinical and         $       0             15,000          $      0
 Pharmaceutical Development              $       0             10,000          $      0

<FN>
- ----------------
(1)  Includes  options to  purchase  45,000  shares of Common  Stock  granted in
     January 1996 for prior year's performance.
(2)  Includes  25,000  shares of Common  Stock  issued to Dr. Hirth in September
     1997 in  connection  with a Restricted  Stock  Purchase  Agreement for past
     services  rendered to the Company,  subject to  forfeiture at the option of
     the Company  upon the  termination  of Dr.  Hirth's  employment  prior to a
     specified date. Subject to certain restrictions,  such shares shall vest in
     full on March 31, 1999.
(3)  Dr.  Hirth's other  compensation  of $50,000  during 1996  consisted of the
     forgiveness of a loan for the purchase of a residence.
(4)  Dr.  Courtneidge's  other  compensation  of $3,085 during 1995 consisted of
     reimbursement  for relocation  expenses.  The other annual  compensation of
     $925  during  1995   consisted  of  a  tax   gross-up  on  the   relocation
     reimbursement.
</FN>
</TABLE>


                       Stock Option Grants and Exercises

     The Company grants options to its executive  officers under its Option Plan
and Long-Term Objectives Stock Option Plan for Senior Management (the "LTO Plan"
and collectively with the Option Plan, the "Employee Plans"). As of December 31,
1997,  options to  purchase a total of  2,102,341  shares  (net of  canceled  or
expired options) had been granted and were outstanding under the Employee Plans,
of which 77,161 are subject to stockholder approval.

                                       18

<PAGE>
<TABLE>
     The  following  tables show for the fiscal year ended  December  31,  1997,
certain information regarding options granted to, exercised by, and held at year
end by the Named Executive Officers:

<CAPTION>
                                   Option Grants in Fiscal Year 1997

                                                               Individual Grants
                                         -------------------------------------------------------------
                                                        % of Total
                                           Number of      Options
                                           Securities   Granted to                Market
                                           Underlying    Employees    Exercise   Price On
                                            Options      in Fiscal     Price      Date of   Expiration
                  Name                     Granted (#)    Year (1)     ($/Sh)      Grant       Date
                 ------                  ------------- ------------ ---------- ----------- -----------
<S>                                         <C>             <C>      <C>        <C>         <C>
Stephen Evans-Freke (3) ................    45,000          7.32     $  13.00   $  13.00    12/22/07

K. Peter Hirth, Ph.D. (4) ..............    50,000          8.14        14.00      14.00     9/15/07
                                            25,000          4.07        13.00      13.00    12/22/07

Sara A. Courtneidge, Ph.D. (5) .........    20,000          3.26        13.00      13.00    12/22/07

Gerald McMahon, Ph.D. (6) ..............    10,000          1.63        13.00      13.00    12/22/07

Laura K. Shawver, Ph.D. (7) ............    12,000          1.96        13.00      13.00    12/22/07


                                           Potential Realizable Value at
                                           Assumed Annual Rates of Stock
                                           Price Appreciation for Option
                                                     Term (2)
                                         ---------------------------------
                  Name                    0% ($)     5% ($)      10% ($)
                 ------                  -------- ----------- ------------
Stephen Evans-Freke (3) ................    $0     $367,903    $  932,339

K. Peter Hirth, Ph.D. (4) ..............     0      440,226     1,115,620
                                             0      204,391       517,966

Sara A. Courtneidge, Ph.D. (5) .........     0      163,513       414,373

Gerald McMahon, Ph.D. (6) ..............     0       81,756       207,187

Laura K. Shawver, Ph.D. (7) ............     0       98,108       248,624

<FN>
- ----------------
(1)  Based on an aggregate of 614,500  options  granted under the Option Plan in
     fiscal year 1997 to employees.  There were no options granted under the LTO
     Plan in fiscal year 1997.
(2)  The  potential  realizable  value is based on the term of the option at the
     time of grant (10 years). It is calculated by assuming that the stock price
     on the date of grant  appreciates at the indicated annual rate,  compounded
     annually  for the  entire  term of the  option,  and  that  the  option  is
     exercised and sold on the last day of its term at the appreciated price. No
     gain to the optionee is possible  unless the stock price increases over the
     option term, which will benefit all stockholders.
(3)  Options to purchase  45,000 shares of Common Stock vests over four years at
     the rate of  one-sixteenth  of the shares subject to the option per quarter
     beginning January 1, 1998.
(4)  Each option to purchase  50,000  shares and 25,000  shares of Common  Stock
     vests over four years at the rate of one-sixteenth of the shares subject to
     the option per quarter  beginning  October 1, 1997 for the  September  1997
     grant and January 1, 1998 for the December 1997 grant.
(5)  Options to purchase  20,000  shares of Common Stock vest over four years at
     the rate of  one-sixteenth  of the shares subject to the option per quarter
     beginning January 1, 1998.
(6)  Options to purchase  10,000  shares of Common Stock vest over four years at
     the rate of  one-sixteenth  of the shares subject to the option per quarter
     beginning January 1, 1998.
(7)  Options to purchase  12,000  shares of Common Stock vest over four years at
     the rate of  one-sixteenth  of the shares subject to the option per quarter
     beginning January 1, 1998.
</FN>
</TABLE>
<TABLE>
                                   Aggregated Option Exercises in Last Fiscal Year
                                          and Fiscal Year-End Option Values

<CAPTION>
                                                                                                        Value of
                                                                           Number of Securities        Unexercised
                                                                                Underlying            In-the-Money
                                                                            Unexercised Options        Options at
                                         Shares                                at FY-End (#)          FY-End ($)(2)
                                       Acquired on          Value              Exercisable/           Exercisable/
                Name                  Exercise (#)     Realized ($)(1)         Unexercisable          Unexercisable
- ------------------------------------ --------------   -----------------   ----------------------   ------------------
<S>                                     <C>              <C>                <C>                    <C>
Stephen Evans-Freke ................        0            $      0                270,000/0         $      821,250/0
K. Peter Hirth, Ph.D ...............    2,666              30,992           80,645/155,289          543,479/265,142
Sara A. Courtneidge, Ph.D. .........    1,000               5,438            55,874/58,126          300,740/124,572
Gerald McMahon, Ph.D ...............    6,000             110,063             9,250/23,084            31,227/41,719
Laura K. Shawver, Ph.D. ............    3,500              40,688            23,842/32,000           154,488/54,547

<FN>
- ----------------
(1)  Value  realized is based on the fair market value of the  Company's  Common
     Stock  on the  date of  exercise  minus  the  exercise  price  and does not
     necessarily indicate that the optionee sold such stock.
(2)  Based on the fair market  value of the  Company's  Common Stock at December
     31, 1997 ($13.125), minus the exercise price of the option.
</FN>
</TABLE>


                                       19

<PAGE>


Report of the Compensation Committee of the Board of Directors on Executive
Compensation (i)

     The  Company's  executive  compensation  program  is  administered  by  the
Compensation Committee,  composed in 1997 of Anthony B. Evnin (who resigned from
the  Company's  Board  of  Directors  in  October  1997),  Donald  E.  Nickelson
(effective  October  1997),  Glenn S. Utt,  Jr.  and  Michael  A.  Wall,  each a
non-employee   director  of  the  Company  in  1997.  Subsequent  to  Mr.  Utt's
resignation from the Company's Board of Directors in January 1998, Bruce R. Ross
was elected to the Compensation Committee to replace Mr. Utt.

     The  Company's  executive  compensation  program  is  designed  to  retain,
motivate and reward  executives who are  responsible  for leading the Company in
achieving its business objectives.  All decisions by the Compensation  Committee
relating to the compensation of the Company's executive officers are reviewed by
the full Board.  This report is  submitted  by the  Compensation  Committee  and
addresses the Company's compensation policies for the fiscal year ended December
31, 1997 as they affected  Stephen  Evans-Freke,  in his capacity as Chairman of
the Board and Chief  Executive  Officer of the Company,  and the other executive
officers of the Company.

Compensation Philosophy

     The  objectives  of the  executive  compensation  program  are to (i) align
compensation with the Company's business objectives and individual  performance,
(ii) motivate and reward high levels of performance,  (iii) recognize and reward
the  achievement  of team and  individual  goals and (iv)  enable the Company to
attract,  retain and reward  executive  officers who contribute to the long-term
success of the Company.

     The  Company's  executive  compensation  philosophy is to tie a significant
portion of executive compensation to the performance of the Company and is based
on the following:

         - The Committee  compares its  executive  compensation  practices  with
         those of other  companies  in the  industry  and sets its  compensation
         guidelines  based  on this  review.  The  Committee  believes  that the
         Company's base annual  salaries for its executives are generally in the
         mid-range of those paid to executives  of  comparable  companies in the
         biopharmaceutical  industry. The Compensation Committee seeks, however,
         to provide its executives with  opportunities  for higher  compensation
         through cash  bonuses,  stock  options  and, to a more limited  extent,
         restricted stock awards.

         - The  Committee  believes  that,  in order  to  further  motivate  its
         executives,  a very  substantial  portion  of the  compensation  of the
         Company's  executives  should be linked to the  Company's  performance,
         including that of its stock in the marketplace. The linkage is achieved
         through  the  Company's  stock  option  program,   which  includes  the
         Company's  1992  Stock  Option  Plan (the "1992  Plan")  and  Long-Term
         Objectives  Stock Option Plan for Senior  Management  (the "LTO Plan").
         This  program  also  serves  to  more  fully  align  the  interests  of
         management with those of the Company's stockholders.

         - The Committee  also believes that an executive  compensation  program
         that ties cash  bonus  awards to  performance  and  achievement  of the
         Company's  stated goals serves both as an influential  motivator to its
         executives and as an effective  instrument for aligning their interests
         with those of the stockholders of the Company.


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

(i) 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,  or the  Securities
Exchange Act of 1934,  as amended,  whether made before or after the date hereof
and irrespective of any general incorporation language contained in such filing.

                                       20

<PAGE>


Implementation of Compensation Program

     Annual  compensation  for  the  Company's   executives  consists  of  three
principal elements: salary, cash bonuses and stock options.

     Salary

     The  Compensation  Committee  sets the base annual salary for executives by
reviewing compensation for comparable positions in the market and the historical
compensation  levels of the  Company's  executives.  Currently,  the base annual
salaries  of the  Company's  executives  are at levels  which  the  Compensation
Committee believes are generally in the midrange of executives of companies with
which the Company compares  itself.  Increases in annual salaries are based on a
review  and  evaluation  of  executive   salary  levels  and  the   demonstrated
capabilities   of  the   executives   in   managing   the  key   aspects   of  a
biopharmaceutical  company,  including,  generally in order of  importance,  (i)
research,  drug  discovery  and  preclinical  and  clinical  development,   (ii)
strategic  planning,  including  corporate  and  scientific  collaborations  and
patent,  (iii) financial  matters,  including  attracting  capital and financial
planning and (iv) human resources.

     Cash Bonuses

     In  December  1996,  the  Compensation   Committee  adopted  the  1997  Key
Management Cash Incentive  Compensation Plan (the "1997 CIP"). The objectives of
the 1997 CIP were  consistent  with the Company's  compensation  philosophy  set
forth  above.  The  objectives  of the 1997 CIP were to motivate  and reward key
management,  including  officers of the Company,  for achievement of significant
operating objectives and to retain key management by remaining  competitive with
other biotechnology companies. The structure of the 1997 CIP was that two-thirds
of an officer's cash bonus was directly related to achievement of specific goals
and the remaining one-third was discretionary. The goals for the officers of the
Company  are  established  annually  by the Board of  Directors  or a  Committee
designated by the Board.  Individual  bonuses of 15% or more of a  participant's
annual base salary are  approved by the  Compensation  Committee.  Cash  bonuses
under  the 1997 CIP were  based on the  achievement  of the  specific  operating
objectives  established for the Company during 1997,  combined with a subjective
assessment  of  individual   performance.   The  Company's  goals  included  the
achievement of objectives with respect to controlling  cash spending,  including
capital expenditures, in accordance with the Company's annual budget, management
of the Company's  future  relocation to a larger  facility,  advancement  of the
Company's  clinical and preclinical  drug development  programs,  furthering the
Company's corporate collaboration  strategies and obtaining additional financing
for the Company,  as well as the attainment of other goals  established  for the
year for the Company and for individual executive officers

     Pursuant to the 1997 CIP, each of the Named Executive  Officers  received a
cash performance  bonus for fiscal 1997 ranging from a high of approximately 34%
to a low of approximately 14% of the executive officer's annual base salary. All
executive  officers of the Company as a group received aggregate bonus awards of
$285,553 for fiscal 1997 performance,  representing a range of 12% to 34% of the
executive officers' respective base salaries.

     Stock Options

     Total   compensation  at  the  executive  level  also  includes   long-term
incentives  offered by stock options.  Stock options are designed to promote the
identity  of  long-term  interests  between  the  Company's  employees  and  its
stockholders  and to assist in the retention of employees.  In the case of stock
options,  the size of individual option grants is generally  intended to reflect
the  executive's  position  with  the  Company  and  his or her  importance  and
contributions to the Company.  Options have been granted to executives under the
1992 Plan and the LTO Plan.  The  option  program  generally  requires a vesting
period to encourage employees to continue in the employ of the Company.

     In December 1997, the  Compensation  Committee  awarded  performance  based
stock  option  grants  under  the 1992  Plan to all of the  Company's  executive
officers for 1997  performance.  Options  granted under the 1992 Plan  generally
vest  quarterly  over four  years  from the date of the  grant.  It has been the
Company's  practice to fix the  exercise  price of option  grants under the 1992
Plan at 100% of the fair

                                       21

<PAGE>


market  value  per  share  on the  date of  grant.  The  Compensation  Committee
considered the number of options held by executive  officers when awarding stock
option grants under the 1992 Plan.

     No  options  were  granted  under  the LTO Plan in  1997.  The LTO Plan was
adopted in 1995 to provide a means to enable the  Company to create  significant
incentives for senior  executive  management  employees to exert maximum efforts
for the success of the Company  through the award of options to purchase  shares
of the Company's Common Stock, which become exercisable over an extended vesting
schedule,  subject to  acceleration  upon the  achievement  of certain  specific
long-term objectives important to the Company's success.

Limitation  on  Deduction  of  Compensation  Paid  to  Certain  Named  Executive
Officers

     Section 162(m) of the Internal Revenue Code (the "Code") limits the Company
to a deduction  for federal  income tax purposes of no more than  $1,000,000  of
compensation paid to certain executive officers in a taxable year.  Compensation
above  $1,000,000  may be  deducted  if it is  "performance-based  compensation"
within the meaning of the Code.

     The Compensation  Committee has determined that stock options granted under
the 1992 Plan with an exercise  price at least equal to the fair market value of
the  Company's   Common  Stock  on  the  date  of  grant  shall  be  treated  as
"performance-based compensation." The Compensation Committee has determined that
compensation  attributable  to stock options granted under the LTO Plan shall be
counted toward the $1,000,000  limitation  and, to the extent such  compensation
exceeds  $1,000,000 when combined with all other types of compensation  received
by a covered  employee  from the Company,  may not be  deductible  as a business
expense by the Company.

Compensation of the Chief Executive Officer in Fiscal 1997

     As discussed above, Mr.  Evans-Freke is eligible to participate in the same
executive  compensation  plans available to the other executive  officers of the
Company,   including   the  1997  CIP.  The   Compensation   Committee  set  Mr.
Evans-Freke's total annual compensation, including compensation derived from the
1997 CIP and stock option  program,  at a level it believes is competitive  with
that  of  other   Chief   Executive   Officers   at  other   companies   in  the
biopharmaceutical  industry,  although at the middle of the range.  In addition,
Mr. Evans-Freke's  performance-based options are at a level and subject to terms
that the Compensation  Committee  believes will properly motivate and retain Mr.
Evans-Freke as the Chief Executive Officer of the Company.

     Mr.  Evans-Freke  earned  $320,000  in 1997 as his annual base  salary.  In
determining  Mr.  Evans-Freke's  salary  for 1997,  the  Compensation  Committee
reviewed various factors. These factors included Mr. Evans-Freke's contributions
for the prior  year,  including  the  advancement  of research  and  development
activities  and the  successful  1996 public  offering of the  Company's  Common
Stock, as well as Mr.  Evans-Freke's  overall success in managing and motivating
the Company's  employees in order to meet the Company's  operating and corporate
objectives,  together with the  challenges to be faced in 1997 and the desire to
offer a  competitive  salary.  His  bonus  award of  $110,000  for  fiscal  1997
performance reflects substantial  attainment of the Company's goals for 1997, as
discussed above under  "Implementation  of Compensation  Program-Cash  Bonuses",
including particularly the advancement of the Company's research and development
activities and the Company's  receipt in 1997 of approximately  $46.0 million of
net proceeds  from the  Company's  private  placement of  convertible  notes and
public offering of Common Stock.

                                       22

<PAGE>


     In December 1997, the  Compensation  Committee  granted Mr.  Evans-Freke an
option under the 1992 Plan to purchase  45,000  shares of the  Company's  Common
Stock in  recognition  of Mr.  Evans-Freke's  substantial  contributions  to the
Company in 1997. The Compensation Committee determined that the level of options
granted  to Mr.  Evans-Freke  under  the  1992  Plan was  commensurate  with Mr.
Evans-Freke's substantial contributions on behalf of the Company during 1997, as
set forth above, and that the level of options  previously granted under the LTO
Plan and the terms of such options are consistent with the Company's  objectives
of motivating and rewarding senior executive officers.


                                   Compensation Committee

                                   Anthony B. Evnin (Resigned October 1997)
                                   Donald E. Nickelson (Effective October 1997),
                                   Chairman
                                   Bruce R. Ross (Effective February 1998)
                                   Glenn S. Utt, Jr. (Resigned January 1998)
                                   Michael A. Wall

                                       23

<PAGE>


Performance Measurement Comparison

<TABLE>
     The following chart shows the total stockholder  return of an investment of
$100 on  October 4, 1994 in cash of (i) the  Company's  Common  Stock,  (ii) the
Nasdaq Stock  Market  (U.S.) Index  ("Nasdaq")  and (iii) the  Hambrecht & Quist
Biotechnology  Index ("H&Q").  All values assume reinvestment of the full amount
of all dividends and compound on a monthly basis:

[The following  descriptive  data is supplied in accordance  with Rule 304(d) of
Regulation S-T]

<CAPTION>
                         COMPARISON OF 13 QUARTER CUMULATIVE TOTAL RETURN ON INVESTMENT

                        Oct-4-94  Dec-94   Mar-95   Jun-95   Sep-95   Dec-95   Mar-96   Jun-96   Sep-96   Dec-96
                          ------  ------   ------   ------   ------   ------   ------   ------   ------   ------
<S>                         <C>   <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>   
SUGEN, Inc.                 100    68.33    90.00    91.67   185.00   198.33   190.00   156.67   158.33   171.67
Nasdaq Stock Market-U.S.    100   101.13   110.24   126.10   141.29   143.01   159.69   161.91   167.67   175.91
H&Q Biotechnology Sector    100   100.74   104.62   117.68   142.21   171.36   163.78   153.05   162.59   158.12
</TABLE>

                          Mar-97   Jun-97   Sep-97   Dec-97
                          ------   ------   ------   ------
SUGEN, Inc.               140.00   171.67   268.33   175.00
Nasdaq Stock Market-U.S.  166.37   196.86   230.16   215.86
H&Q Biotechnology Sector  151.79   159.73   172.47   160.05


- ----------------
     This Section 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 1933 Securities Act or the 1934 Securities  Exchange Act, whether made
before or after the date hereof and  irrespective  of any general  incorporation
language contained in any such filing.

     The  performance  of the  Company's  stock  over  the  period  shown is not
necessarily indicative of future performance.  October 4, 1994 was the effective
date of the Company's initial public offering.

                                       24

<PAGE>


                              CERTAIN TRANSACTIONS

     The Company paid $75,000 and $100,000 to Axel Ullrich, Ph.D., a director of
the Company, and Joseph Schlessinger,  Ph.D., an honorary member of the Board of
Directors of the Company,  respectively, for consulting services rendered to the
Company in the last fiscal year, pursuant to consulting  agreements entered into
in August 1991.

     The Company paid $60,000 to Stephen K. Carter, M.D., Senior Vice President,
Clinical and Regulatory Affairs, for consulting services rendered to the Company
in the last fiscal year, pursuant to a consulting  agreement entered into in May
1997. Dr. Carter's appointment as Senior Vice President, Clinical and Regulatory
Affairs was effective in January 1998.

     In connection with the resignation of Ms.  Christine E. Gray-Smith from her
position as Vice President, Finance of the Company in November 1997, the Company
entered  into a  severance  arrangement  with Ms.  Gray-Smith.  Pursuant to such
arrangement,  the Company paid Ms.  Gray-Smith a bonus for the fiscal year ended
December 31, 1997 and the Company  entered into a consulting  agreement with Ms.
Gray-Smith effective January 2, 1998 which provides for the continued vesting of
stock options previously granted to Ms. Gray-Smith until July 1998.

     The Company has  entered  into  indemnity  agreements  with  certain of its
officers and directors which provide,  among other things, that the Company will
indemnify such officer or director,  under the  circumstances  and to the extent
provided for therein, for expenses, damages, judgments, fines and settlements he
or she may be  required to pay in actions or  proceedings  which he or she is or
may be made a party by reason of such person's  position as a director,  officer
or other agent of the Company,  and otherwise to the full extent permitted under
Delaware law and the Company's Bylaws.


                                  OTHER MATTERS

     The Board of Directors knows of no other matters that will be presented for
consideration  at the Annual Meeting.  If any other matters are properly brought
before the meeting, it is the intention of the persons named in the accompanying
proxy to vote on such matters in accordance with their best judgment.


                                        By Order of the Board of Directors



                                        Richard D. Spizzirri
                                        Secretary


April 17, 1998

     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, 1997 is available
without charge upon written request to:  Investor  Relations,  SUGEN,  Inc., 351
Galveston Drive, Redwood City, CA 94063.

                                       25

<PAGE>


                                                                      1354-PS-98
<PAGE>
                                                                      Appendix A
                                                        
                                   SUGEN, INC.

                 1994 NON-EMPLOYEE DIRECTORS' STOCK OPTION PLAN

                             Adopted April 12, 1994
                            Effective October 4, 1994
                        Termination Date: April 12, 2004


1.       PURPOSE.

         (a) The purpose of the 1994  Non-Employee  Directors' Stock Option Plan
(the "Plan") is to provide a means by which each  director of SUGEN,  Inc.  (the
"Company")  who is not  otherwise an employee of the Company or of any Affiliate
of the Company (each such person being hereafter  referred to as a "Non-Employee
Director") will be given an opportunity to purchase stock of the Company.

         (b)  The  word  "Affiliate"  as  used  in the  Plan  means  any  parent
corporation or subsidiary  corporation of the Company as those terms are defined
in Sections 424(e) and (f), respectively,  of the Internal Revenue Code of 1986,
as amended from time to time (the "Code").

         (c) The Company,  by means of the Plan, seeks to retain the services of
persons now serving as  Non-Employee  Directors  of the  Company,  to secure and
retain the  services  of persons  capable  of serving in such  capacity,  and to
provide  incentives for such persons to exert maximum efforts for the success of
the Company.

2.       ADMINISTRATION.

         (a) The Plan shall be  administered  by the Board of  Directors  of the
Company (the "Board") unless and until the Board delegates  administration  to a
committee, as provided in subparagraph 2(b).

         (b) The Board may  delegate  administration  of the Plan to a committee
composed  of not fewer than two (2) members of the Board (the  "Committee").  If
administration  is  delegated  to a  Committee,  the  Committee  shall have,  in
connection with the administration of the Plan, the powers theretofore possessed
by the Board, subject,  however, to such resolutions,  not inconsistent with the
provisions  of the Plan,  as may be adopted from time to time by the Board.  The
Board  may  abolish  the  Committee  at any time and  revest  in the  Board  the
administration of the Plan.

3.       SHARES SUBJECT TO THE PLAN.

         (a) Subject to the  provisions of paragraph 10 relating to  adjustments
upon changes in stock,  the stock that may be sold  pursuant to options  granted
under the Plan shall not exceed in the aggregate  three hundred eighty  thousand
(380,000)  shares of the Company's common stock. If any option granted under the
Plan shall for any reason  expire or  otherwise  terminate  without

                                       1.
<PAGE>

having been exercised in full,  the stock not purchased  under such option shall
again become available for the Plan.

         (b) The stock subject to the Plan may be unissued  shares or reacquired
shares, bought on the market or otherwise.

4.       ELIGIBILITY.

         Options shall be granted only to Non-Employee Directors of the Company.

5.       NON-DISCRETIONARY GRANTS.

         (a) Upon the date of the annual meeting of  stockholders of the Company
held during 1995, each person who is then a Non-Employee Director of the Company
and has been a Non-Employee Director for at least three (3) months automatically
shall be granted an option to purchase  two  thousand  (2,000)  shares of common
stock of the Company on the terms and conditions set forth herein.

         (b) Each person who is, after the Adoption Date,  elected for the first
time to be a Non-Employee Director  automatically shall, upon the date of his or
her initial election to be a Non-Employee  Director by the Board or stockholders
of the Company, be granted an option to purchase ten thousand (10,000) shares of
common stock of the Company on the terms and conditions set forth herein.

         (c)  Ten  (10)  days  following  the  date of each  annual  meeting  of
stockholders of the Company,  commencing with the meeting held during 1995, each
person  who is then a  Non-Employee  Director  of the  Company  and  has  been a
Non-Employee  Director  for at least  three (3)  months  automatically  shall be
granted an option to purchase  five thousand  (5,000)  shares of common stock of
the Company on the terms and conditions set forth herein.

6.       OPTION PROVISIONS.

         Each option shall be subject to the following terms and conditions:

         (a) The term of each option  commences  on the date it is granted  and,
unless sooner  terminated as set forth herein,  expires on the date ("Expiration
Date")  ten (10) years from the date of grant.  If the  optionee's  service as a
Non-Employee Director of the Company terminates for any reason or for no reason,
including the optionee's death, the option shall terminate on the earlier of the
Expiration Date or the date six (6) months  following the date of termination of
service.  In any and all  circumstances,  an option may be  exercised  following
termination of the optionee's service as a Non-Employee  Director of the Company
only as to that  number  of  shares  as to  which it was  vested  on the date of
termination of such service under the provisions of subparagraph 6(e).

         (b) The  exercise  price of each option  shall be one  hundred  percent
(100%) of the fair market value of the stock  subject to such option on the date
such option is granted.

                                       2.
<PAGE>

         (c) Payment of the exercise price of each option is due in full in cash
upon any exercise when the number of shares being  purchased  upon such exercise
is less than one thousand  (1,000)  shares;  but when the number of shares being
purchased upon an exercise is one thousand (1,000) or more shares,  the optionee
may elect to make  payment  of the  exercise  price  under one of the  following
alternatives:

                  (i)  Payment  of the  exercise  price per share in cash at the
time of exercise; or

                  (ii)  Provided  that at the time of the exercise the Company's
common stock is publicly traded and quoted regularly in the Wall Street Journal,
payment by delivery of shares of common  stock of the Company  already  owned by
the  optionee,  held for the period  required to avoid a charge to the Company's
reported earnings,  and owned free and clear of any liens, claims,  encumbrances
or  security  interest,  which  common  stock shall be valued at its fair market
value on the date preceding the date of exercise; or

                  (iii)  Payment  by a  combination  of the  methods  of payment
specified in subparagraph 6(c)(i) and 6(c)(ii) above.

         Notwithstanding the foregoing, this option may be exercised pursuant to
a program  developed  under  Regulation T as promulgated by the Federal  Reserve
Board which  results in the  receipt of cash (or check) by the Company  prior to
the issuance of shares of the Company's common stock.

         (d) An option shall not be  transferable  except by will or by the laws
of descent and distribution, and shall be exercisable during the lifetime of the
person  to whom the  option  is  granted  only by such  person  or by his or her
guardian or legal representative.  The person to whom the option is granted may,
by  delivering  written  notice to the Company,  in a form  satisfactory  to the
Company, designate a third party who, in the event of the death of the optionee,
shall thereafter be entitled to exercise the option.

         (e)  Options  granted  pursuant  to the Plan  shall  become  vested  as
follows:  (i) options granted  pursuant to subparagraph  5(a) above shall become
fully vested on the date of grant; (ii) options granted pursuant to subparagraph
5(b) above shall become vested in installments  over a period of five years from
the date of grant at the rate of twenty percent (20%) per year in five (5) equal
annual installments commencing on the date one year after the date of grant; and
(iii) options  granted  pursuant to  subparagraph  5(c) above shall become fully
vested on the date ten days  prior to the date of the first  annual  meeting  of
stockholders  of the Company  subsequent  to the date of the grant.  The options
shall vest as set forth above, provided that the optionee has, during the entire
period  prior  to such  vesting  date,  continuously  served  as a  Non-Employee
Director to the Company or any Affiliate of the Company.

         (f) The optionee may elect at any time while a Non-Employee Director of
the Company to exercise the option as to any or all of the shares subject to the
option  prior to vesting of the option as described in  subparagraph  5(e).  Any
unvested shares so purchased shall be subject to a repurchase  right in favor of
the Company.

                                       3.
<PAGE>

         (g) The  Company may  require  any  optionee,  or any person to whom an
option is transferred under  subparagraph 6(d), as a condition of exercising any
such option:  (i) to give written  assurances  satisfactory to the Company as to
the optionee's  knowledge and experience in financial and business matters;  and
(ii) to give written  assurances  satisfactory  to the Company stating that such
person is  acquiring  the stock  subject  to the option  for such  person's  own
account and not with any present intention of selling or otherwise  distributing
the  stock.  These  requirements,  and any  assurances  given  pursuant  to such
requirements,  shall be  inoperative  if (i) the issuance of the shares upon the
exercise  of the option  has been  registered  under a  then-currently-effective
registration  statement  under  the  Securities  Act of 1933,  as  amended  (the
"Securities Act"), or (ii), as to any particular requirement, a determination is
made by counsel for the  Company  that such  requirement  need not be met in the
circumstances under the then-applicable securities laws.

         (h)  Notwithstanding  anything to the  contrary  contained  herein,  an
option may not be exercised  unless the shares  issuable  upon  exercise of such
option are then  registered  under the Securities Act or, if such shares are not
then so registered,  the Company has determined  that such exercise and issuance
would be exempt from the registration requirements of the Securities Act.

7.       COVENANTS OF THE COMPANY.

         (a) During the terms of the options granted under the Plan, the Company
shall  keep  available  at all times the number of shares of stock  required  to
satisfy such options.

         (b) The Company shall seek to obtain from each regulatory commission or
agency having  jurisdiction  over the Plan such  authority as may be required to
issue and sell shares of stock upon  exercise of the options  granted  under the
Plan; provided,  however, that this undertaking shall not require the Company to
register  under the Securities Act either the Plan, any option granted under the
Plan,  or any stock issued or issuable  pursuant to any such  option.  If, after
reasonable  efforts,  the Company is unable to obtain  from any such  regulatory
commission or agency the authority which counsel for the Company deems necessary
for the lawful  issuance and sale of stock under the Plan,  the Company shall be
relieved from any liability for failure to issue and sell stock upon exercise of
such options.

8.       USE OF PROCEEDS FROM STOCK.

Proceeds from the sale of stock pursuant to options granted under the Plan shall
constitute general funds of the Company.

9.       MISCELLANEOUS.

         (a) Neither an optionee nor any person to whom an option is transferred
under  subparagraph  6(d) shall be deemed to be the holder of, or to have any of
the rights of a holder with respect to, any shares subject to such option unless
and until such person has satisfied all  requirements for exercise of the option
pursuant to its terms.

                                       4.
<PAGE>

         (b) Throughout the term of any option granted pursuant to the Plan, the
Company  shall make  available to the holder of such option,  not later than one
hundred twenty (120) days after the close of each of the Company's  fiscal years
during the option term,  upon  request,  such  financial  and other  information
regarding the Company as comprises the annual report to the  stockholders of the
Company  provided  for in the Bylaws of the Company  and such other  information
regarding the Company as the holder of such option may reasonably request.

         (c) Nothing in the Plan or in any instrument  executed pursuant thereto
shall confer upon any Non-Employee Director any right to continue in the service
of the Company or any  Affiliate or shall  affect any right of the Company,  its
Board  or  stockholders  or  any  Affiliate  to  terminate  the  service  of any
Non-Employee Director with or without cause.

         (d) No Non-Employee  Director,  individually or as a member of a group,
and no beneficiary  or other person  claiming under or through him or her, shall
have any right,  title or interest in or to any option reserved for the purposes
of the Plan except as to such shares of common stock, if any, as shall have been
reserved for such  Non-Employee  Director  pursuant to an option granted to such
Non-Employee Director.

         (e) In connection  with each option made pursuant to the Plan, it shall
be a condition precedent to the Company's obligation to issue or transfer shares
to a Non-Employee  Director,  or to evidence the removal of any  restrictions on
transfer, that such Non-Employee Director make arrangements  satisfactory to the
Company  to insure  that the  amount of any  federal  or other  withholding  tax
required to be withheld  with respect to such sale or transfer,  or such removal
or lapse, is made available to the Company for timely payment of such tax.

         (f) As used in this Plan,  fair market value means, as of any date, the
value of the common stock of the Company determined as follows:

                  (i) If the  common  stock is listed on any  established  stock
exchange or a national market system,  including without limitation the National
Market System of the National Association of Securities Dealers,  Inc. Automated
Quotation  ("Nasdaq")  System,  the Fair Market Value of a share of common stock
shall be the  closing  sales  price for such  stock as quoted on such  system or
exchange (or the exchange  with the greatest  volume of trading in common stock)
on the last market trading day prior to the day of determination, as reported in
the Wall Street Journal or such other source as the Board deems reliable;

                  (ii) If the common  stock is quoted on the Nasdaq  System (but
not  on  the  National  Market  System  thereof)  or is  regularly  quoted  by a
recognized  securities  dealer but  selling  prices are not  reported,  the Fair
Market  Value of a share of common  stock shall be the mean  between the bid and
asked  prices for the common  stock on the last market  trading day prior to the
day of  determination,  as  reported  in the Wall  Street  Journal or such other
source as the Board deems reliable;

                  (iii) In the absence of an  established  market for the common
stock, the Fair Market Value shall be determined in good faith by the Board.

                                       5.
<PAGE>

10.      ADJUSTMENTS UPON CHANGES IN STOCK.

         (a) If any change is made in the stock  subject to the Plan, or subject
to  any  option   granted  under  the  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 Plan and outstanding
options will be  appropriately  adjusted in the class(es) and maximum  number of
shares  subject to the Plan and the class(es) and number of shares and price per
share of stock subject to outstanding options.

         (b) In the event of: (1) a merger or consolidation in which the Company
is not the surviving  corporation;  (2) a reverse merger in which the Company is
the  surviving  corporation  but  the  shares  of  the  Company's  common  stock
outstanding  immediately  preceding  the merger are  converted  by virtue of the
merger  into  other  property,  whether  in the  form  of  securities,  cash  or
otherwise; (3) any other capital reorganization in which more than fifty percent
(50%)  of the  shares  of the  Company  entitled  to vote are  exchanged;  (4) a
transaction  or  group  of  related  transactions  involving  the sale of all or
substantially  all of the Company's  assets;  (5) the acquisition by any person,
entity  or group  (excluding  any  employee  benefit  plan,  or  related  trust,
sponsored or maintained by the Company or any  subsidiary of the Company) of the
beneficial  ownership,  directly or  indirectly,  of  securities  of the Company
representing  more than fifty percent (50%) of the combined  voting power in the
election of directors; or (6) a change in the composition of the Company's Board
of Directors such that, during any period of two consecutive years,  individuals
who, at the  beginning  of such  period,  constitute  the Board,  together  with
individuals  who are Approved New  Directors (as defined  below),  cease for any
reason to have  authority  to cast at least a  majority  of the votes  which all
directors on the Board are entitled to vote;  then, to the extent not prohibited
by law, the time during which  options  outstanding  under the Plan become fully
vested shall be accelerated  prior to such event, and the options  terminated if
not  exercised  at or prior to such event.  For  purposes  of this  subparagraph
10(b), an Approved New Director shall be a Board member whose  election,  or the
nomination for election by the Company's stockholders, was approved by a vote of
a  majority  of the votes  entitled  to be cast by the  directors  then still in
office who were directors at the beginning of the period.

11.      AMENDMENT OF THE PLAN.

         (a) The Board at any time,  and from time to time,  may amend the Plan,
provided,  however, that the Board shall not amend the Plan more than once every
six (6) months,  with respect to the  provisions of the Plan which relate to the
amount,  price and timing of grants,  other than to comport  with changes in the
Code,  the Employee  Retirement  Income  Security Act, or the rules  thereunder.
Except as provided in  paragraph  10 relating  to  adjustments  upon  changes in
stock,  no amendment shall be effective  unless approved by the  stockholders of
the  Company  within  twelve  (12)  months  before or after the  adoption of the
amendment, where the amendment will:

                  (i)  Increase  the number of shares  which may be issued under
the Plan; or

                                       6.
<PAGE>

                  (ii)  Modify  the Plan in any other  way if such  modification
requires  stockholder  approval  in  order  for the  Plan  to  comply  with  the
requirements  of  Rule  16b-3  or any  Nasdaq  or  securities  exchange  listing
requirements); or

                  (iii)  Modify  the Plan in any other way if such  modification
requires  stockholder  approval  in  order  for the  Plan  to  comply  with  the
requirements of Rule 16b-3.

         (b)  Rights  and  obligations  under  any  option  granted  before  any
amendment of the Plan shall not be altered or impaired by such amendment  unless
(i) the  Company  requests  the  consent  of the  person to whom the  option was
granted and (ii) such person consents in writing.

12.      TERMINATION OR SUSPENSION OF THE PLAN.

         (a) The Board may  suspend or  terminate  the Plan at any time.  Unless
sooner terminated, the Plan shall terminate on April 12, 2004. No options may be
granted under the Plan while the Plan is suspended or after it is terminated.

         (b) Rights and  obligations  under any option granted while the Plan is
in effect shall not be altered or impaired by suspension or  termination  of the
Plan, except with the consent of the person to whom the option was granted.

         (c) The Plan shall  terminate  upon the occurrence of any of the events
described in Section 10(b) above.

13.      EFFECTIVE DATE OF PLAN; CONDITIONS OF EXERCISE.

         (a) The Plan  shall  become  effective  upon  adoption  by the Board of
Directors,  subject to the condition  subsequent  that the  stockholders  of the
Company approve the Plan.

         (b) No option  granted under the Plan shall be exercised or exercisable
unless and until the condition of subparagraph 13(a) above has been met.

                                       7.
<PAGE>

                                  PLAN HISTORY



Adopted  April 12,  1994 to be  effective  upon the Initial  Public  Offering of
SUGEN, Inc. Common Stock (October 4, 1994)
Approved by the Stockholders on May 20, 1994

Amended by the Board of Directors on February 24, 1995
Approved by Stockholders on June 6, 1995

Amended by the Board of Directors on December 19, 1995
Approved by the Stockholders on May 23, 1996

Amended by the Board of Directors on February 19, 1998
Approved by the Stockholders on _______________, 1998

                                       8.
<PAGE>

                                                                      Appendix B

                                   SUGEN, INC.

                             1992 STOCK OPTION PLAN

                            Adopted February 28, 1992
                       Termination Date: February 27, 2002


1.       PURPOSES.

         (a) The  purpose  of the Plan is to  provide a means by which  selected
Employees and Directors of and  Consultants to the Company,  and its Affiliates,
may be given an opportunity to purchase stock of the Company.

         (b) The Company,  by means of the Plan, seeks to retain the services of
persons who are now Employees or Directors of or Consultants to the Company,  to
secure and retain the services of new Employees,  Directors and Consultants, and
to provide  incentives for such persons to exert maximum efforts for the success
of the Company.

         (c) The Company  intends that the Options  issued under the Plan shall,
in the  discretion  of the Board or any  Committee to which  responsibility  for
administration  of the Plan has been delegated  pursuant to subsection  3(c), be
either Incentive Stock Options or Nonstatutory Stock Options.  All Options shall
be separately  designated  Incentive Stock Options or Nonstatutory Stock Options
at the time of grant,  and in such form as issued  pursuant  to Section 6, and a
separate  certificate  or  certificates  will be issued for shares  purchased on
exercise of each type of Option.

2.       DEFINITIONS.

         (a) "Affiliate" means any parent corporation or subsidiary corporation,
whether now or hereafter existing, as those terms are defined in Sections 424(e)
and (f) respectively, of the Code.

         (b) "Board" means the Board of Directors of the Company.

         (c) "Code" means the Internal Revenue Code of 1986, as amended.

         (d) "Committee" means a Committee  appointed by the Board in accordance
with subsection 3(c) of the Plan.

         (e) "Company" means SUGEN, Inc., a Delaware corporation.

         (f) "Consultant" means any person, including an advisor, engaged by the
Company or an Affiliate  to render  consulting  or advisory  services and who is
compensated  for such services,  provided that the term  "Consultant"  shall not
include  Directors who are paid only a

                                       1.
<PAGE>

director's  fee by the  Company or who are not  compensated  by the  Company for
their services as Directors.

         (g) "Continuous Service" (formerly,  "Continuous Status as an Employee,
Director or  Consultant")  means the employment or relationship as a Director or
Consultant is not interrupted or terminated by the Company or any Affiliate. The
Optionee's  Continuous  Service  shall not be deemed to have  terminated  merely
because of a change in the capacity in which the Optionee renders service to the
Company or an Affiliate as an  Employee,  Consultant  or Director or a change in
the entity for which the Optionee  renders such service,  provided that there is
no  interruption  or  termination  of the  Optionee's  Continuous  Service.  For
example,  a change in status from an Employee of the Company to a Consultant  of
an Affiliate or a Director of the Company will not constitute an interruption of
Continuous Service.  The Board or the chief executive officer of the Company, in
that party's sole discretion,  may determine whether Continuous Service shall be
considered interrupted in the case of: (i) any leave of absence approved by that
party,  including  sick leave,  military  leave,  or any other  personal  leave;
provided,  however, that for purposes of Incentive Stock Options, any such leave
may not exceed ninety (90) days, unless reemployment upon the expiration of such
leave is guaranteed by contract (including certain Company policies) or statute;
or (ii)  transfers  between  locations  of the Company or between  the  Company,
Affiliates or its successor.

         (h) "Covered  Employee" means the chief executive  officer and the four
(4)  other  highest   compensated   officers  of  the  Company  for  whom  total
compensation is required to be reported to stockholders  under the Exchange Act,
as determined for purposes of Section 162(m) of the Code.

         (i) "Director" means a member of the Board.

         (j)  "Disability"  means total and  permanent  disability as defined in
Section 22(e)(3) of the Code.

         (k)  "Employee"  means any person,  including  Officers and  Directors,
employed by the Company or any  Affiliate of the Company.  Neither  service as a
Director nor payment of a director's  fee by the Company  shall be sufficient to
constitute "employment" by the Company.

         (l)  "Exchange  Act"  means the  Securities  Exchange  Act of 1934,  as
amended.

         (m) "Fair Market Value" means,  as of any date, the value of the common
stock of the Company determined as follows:

                  (1) If the  common  stock is listed on any  established  stock
exchange or a national market system,  including without limitation the National
Market System of the National Association of Securities Dealers,  Inc. Automated
Quotation  ("Nasdaq")  System,  the Fair Market Value of a share of common stock
shall be the  closing  sales  price for such  stock as quoted on such  system or
exchange (or the exchange  with the greatest  volume of trading in common stock)

                                       2.
<PAGE>

on the last market trading day prior to the day of determination, as reported in
the Wall Street Journal or such other source as the Board deems reliable;

                  (2) If the common  stock is quoted on the Nasdaq  System  (but
not  on  the  National  Market  System  thereof)  or is  regularly  quoted  by a
recognized  securities  dealer but  selling  prices are not  reported,  the Fair
Market  Value of a share of common  stock shall be the mean between the high bid
and high asked prices for the common stock on the last market  trading day prior
to the day of  determination,  as reported  in the Wall  Street  Journal or such
other source as the Board deems reliable;

                  (3) In the  absence  of an  established  market for the common
stock, the Fair Market Value shall be determined in good faith by the Board.

         (n) "Incentive  Stock Option" means an Option intended to qualify as an
incentive  stock  option  within the  meaning of Section 422 of the Code and the
regulations promulgated thereunder.

         (o) "Nonstatutory Stock Option" means an Option not intended to qualify
as an Incentive Stock Option.

         (p)  "Officer"  means a person who is an officer of the Company  within
the  meaning  of Section 16 of the  Exchange  Act and the rules and  regulations
promulgated thereunder.

         (q) "Option" means a stock option granted pursuant to the Plan.

         (r) "Option  Agreement" means a written  agreement  between the Company
and an Optionee  evidencing  the terms and  conditions of an  individual  Option
grant. The Option Agreement is subject to the terms and conditions of the Plan.

         (s) "Optioned  Stock" means the common stock of the Company  subject to
an Option.

         (t) "Optionee"  means an Employee,  Director or Consultant who holds an
outstanding Option.

         (u) "Outside Director" means a Director who either (i) is not a current
employee of the Company or an  "affiliated  corporation"  (within the meaning of
the Treasury regulations promulgated under Section 162(m) of the Code), is not a
former  employee  of  the  Company  or  an  "affiliated  corporation"  receiving
compensation  for prior  services  (other than  benefits  under a tax  qualified
pension plan), was not an officer of the Company or an "affiliated  corporation"
at any time, and is not currently receiving direct or indirect remuneration from
the Company or an  "affiliated  corporation"  for services in any capacity other
than as a Director,  or (ii) is otherwise  considered an "outside  director" for
purposes of Section 162(m) of the Code.

         (v)      "Plan" means this SUGEN, Inc. 1992 Stock Option Plan.

                                       3.
<PAGE>

         (w) "Rule 16b-3" means Rule 16b-3 of the Exchange Act or any  successor
to Rule 16b-3,  as in effect when  discretion is being exercised with respect to
the Plan.

         (x) "Securities Act" means the Securities Act of 1933, as amended.


3.       ADMINISTRATION.

         (a) The Board  shall  administer  the Plan  unless  and until the Board
delegates administration to a Committee, as provided in subsection 3(c).

         (b) The  Board  shall  have the  power,  subject  to,  and  within  the
limitations of, the express provisions of the Plan:

                  (1) To  determine  from  time to  time  which  of the  persons
eligible under the Plan shall be granted Options;  when and how the Option shall
be  granted;  whether  the  Option  will  be  an  Incentive  Stock  Option  or a
Nonstatutory Stock Option; the provisions of each Option granted (which need not
be identical), including the time or times such Option may be exercised in whole
or in part;  and the  number of shares  for which an Option  shall be granted to
each such person.

                  (2) To construe  and  interpret  the Plan and Options  granted
under it, and to  establish,  amend and  revoke  rules and  regulations  for its
administration.  The Board,  in the  exercise  of this  power,  may  correct any
defect,  omission or inconsistency in the Plan or in any Option Agreement,  in a
manner and to the extent it shall deem  necessary  or expedient to make the Plan
fully effective.

                  (3) To amend the Plan as provided in Section 11.

                  (4)  Generally,  to exercise  such powers and to perform  such
acts as the Board deems  necessary or expedient to promote the best interests of
the Company.

         (c) The Board may  delegate  administration  of the Plan to a committee
composed of not fewer than two (2) members (the "Committee"), all of the members
of which Committee may be, in the discretion of the Board, Outside Directors. If
administration  is  delegated  to a  Committee,  the  Committee  shall have,  in
connection with the administration of the Plan, the powers theretofore possessed
by the Board (and  references  in this Plan to the Board shall  thereafter be to
the Committee), subject, however, to such resolutions, not inconsistent with the
provisions  of the Plan,  as may be adopted from time to time by the Board.  The
Board  may  abolish  the  Committee  at any time and  revest  in the  Board  the
administration  of the Plan.  Notwithstanding  anything in this Section 3 to the
contrary,  the Board or the Committee may delegate to a committee of one or more
members of the Board the authority to grant Options to eligible  persons who (1)
are not then subject to Section 16 of the Exchange Act and/or (2) are either (i)
not then Covered  Employees and are not expected to be Covered  Employees at the
time of  recognition of income  resulting from such Option,  or (ii) not persons
with  respect to whom the Company  wishes to comply with  Section  162(m) of the
Code.

                                       4.
<PAGE>


4.       SHARES SUBJECT TO THE PLAN.

         (a) Subject to the  provisions  of Section 10  relating to  adjustments
upon changes in stock,  the stock that may be sold pursuant to Options shall not
exceed in the aggregate three million five hundred thousand  (3,500,000)  shares
of the  Company's  common  stock.  If any Option shall for any reason  expire or
otherwise  terminate  without  having  been  exercised  in full,  the  stock not
purchased under such Option shall again become available for the Plan.

         (b) The stock subject to the Plan may be unissued  shares or reacquired
shares, bought on the market or otherwise.

5.       ELIGIBILITY.

         (a)  Incentive   Stock  Options  may  be  granted  only  to  Employees.
Nonstatutory  Stock  Options  may be granted  only to  Employees,  Directors  or
Consultants.

         (b) No person  shall be eligible  for the grant of an Option if, at the
time of grant,  such person owns (or is deemed to own pursuant to Section 424(d)
of the Code) stock  possessing more than ten percent (10%) of the total combined
voting power of all classes of stock of the Company or of any of its  Affiliates
unless the  exercise  price of such  Option is at least one  hundred ten percent
(110%)  of the  Fair  Market  Value of such  stock at the date of grant  and the
Option is not  exercisable  after the expiration of five (5) years from the date
of grant.

         (c) Subject to the  provisions  of Section 10  relating to  adjustments
upon  changes  in stock,  no person  shall be  eligible  to be  granted  Options
covering  more than five percent  (5%) of the number of shares of the  Company's
common  stock that was  outstanding  on the record date for the  Company's  1995
Annual Stockholder Meeting (i.e., four hundred thirty-four thousand five hundred
twenty-seven (434,527) shares) in any calendar year.

6.       OPTION PROVISIONS.

         Each  Option  shall be in such form and shall  contain  such  terms and
conditions  as the Board  shall deem  appropriate.  The  provisions  of separate
Options  need  not  be  identical,   but  each  Option  shall  include  (through
incorporation of provisions  hereof by reference in the Option or otherwise) the
substance of each of the following provisions:

         (a) Term. No Option shall be  exercisable  after the  expiration of ten
(10) years from the date it was granted.

         (b) Price.  The exercise price of each Incentive  Stock Option shall be
not less than one hundred  percent  (100%) of the fair market value of the stock
subject to the Option on the date the Option is granted.  The exercise  price of
each Nonstatutory Stock Option shall be not less than eighty-five  percent (85%)
of the fair  market  value of the stock  subject  to the  Option on the date the
Option is granted.  Notwithstanding  the  foregoing,  the exercise price of each
Option

                                       5.
<PAGE>

shall be not less than one hundred ten percent  (110%) of the Fair Market  Value
of the stock  subject  to the  Option on the date the  Option is  granted if the
person to whom the Option is granted owns stock possessing more than ten percent
(10%) of the total combined  voting power of all classes of stock,  as described
in subsection 5(b).

         (c) Consideration.  The purchase price of stock acquired pursuant to an
Option  shall be paid,  to the  extent  permitted  by  applicable  statutes  and
regulations,  either (i) in cash at the time the option is exercised, or (ii) at
the discretion of the Board or the Committee, either at the time of the grant or
exercise of the Option,  (A) by delivery to the Company of other common stock of
the Company, (B) according to a deferred payment or other arrangement (which may
include,  without  limiting the  generality of the  foregoing,  the use of other
common stock of the Company) with the person to whom the Option is granted or to
whom the Option is transferred  pursuant to subsection 6(d), or (C) in any other
form of legal  consideration  that may be  acceptable  to the  Board;  provided,
however, that at any time that the Company is incorporated in Delaware,  payment
of  the  Common  Stock's  "par  value,"  as  defined  in  the  Delaware  General
Corporation Law, shall not be made by deferred payment.

         In the case of any  deferred  payment  arrangement,  interest  shall be
compounded  at least  annually  and  shall be  charged  at the  minimum  rate of
interest  necessary to avoid the  treatment as  interest,  under any  applicable
provisions of the Code, of any amounts other than amounts  stated to be interest
under the deferred payment arrangement.

         (d)   Transferability.   An   Incentive   Stock  Option  shall  not  be
transferable  except by will or by the laws of  descent  and  distribution,  and
shall be  exercisable  during the  lifetime of the person to whom the  Incentive
Stock Option is granted only by such person.  A Nonstatutory  Stock Option shall
not be transferable except by will or by the laws of descent and distribution or
pursuant to a qualified domestic relations order as defined by the Code or Title
I of the Employee  Retirement  Income  Security  Act,  and shall be  exercisable
during the  lifetime  of the  person to whom the Option is granted  only by such
person or any  transferee  pursuant to a QDRO.  The person to whom the Option is
granted may, by delivering written notice to the Company, in a form satisfactory
to the  Company,  designate  a third party who, in the event of the death of the
Optionee, shall thereafter be entitled to exercise the Option.

         (e) Vesting.  The total number of shares of stock  subject to an Option
may,  but need not, be allotted in periodic  installments  (which may,  but need
not, be equal).  The Option  Agreement may provide that from time to time during
each of such installment  periods,  the Option may become  exercisable  ("vest")
with respect to some or all of the shares  allotted to that  period,  and may be
exercised  with  respect to some or all of the shares  allotted  to such  period
and/or any prior period as to which the Option  became  vested but was not fully
exercised.  During the  remainder of the term of the Option (if its term extends
beyond the end of the  installment  periods),  the option may be exercised  from
time to time with  respect to any shares then  remaining  subject to the Option.
The  provisions  of this  subsection  6(e) are subject to any Option  provisions
governing the minimum number of shares as to which an Option may be exercised.

                                       6.
<PAGE>

         (f) Securities Law Compliance. The Company may require any Optionee, or
any  person  to whom an  Option  is  transferred  under  subsection  6(d),  as a
condition  of  exercising  any  such  Option,  (1) to  give  written  assurances
satisfactory  to the Company as to the  Optionee's  knowledge and  experience in
financial  and  business  matters  and/or to employ a  purchaser  representative
reasonably  satisfactory to the Company who is knowledgeable  and experienced in
financial  and business  matters,  and that he or she is capable of  evaluating,
alone or together  with the  purchaser  representative,  the merits and risks of
exercising the Option;  and (2) to give written  assurances  satisfactory to the
Company  stating that such person is acquiring  the stock  subject to the Option
for such  person's own account and not with any present  intention of selling or
otherwise  distributing the stock. These requirements,  and any assurances given
pursuant to such  requirements,  shall be inoperative if (i) the issuance of the
shares  upon  the  exercise  of the  Option  has  been  registered  under a then
currently effective  registration statement under the Securities Act, or (ii) as
to any  particular  requirement,  a  determination  is made by  counsel  for the
Company that such  requirement  need not be met in the  circumstances  under the
then applicable securities laws.

         (g)  Termination  of  Continuous  Service.  In the event an  Optionee's
Continuous   Service  terminates  (other  than  upon  the  Optionee's  death  or
Disability),  the Optionee may exercise his or her Option,  but only within such
period of time as is  determined  by the Board,  and only to the extent that the
Optionee was entitled to exercise it at the date of termination (but in no event
later than the  expiration of the term of such Option as set forth in the Option
Agreement).  In the case of an Incentive Stock Option, the Board shall determine
such period of time  (generally  not to exceed three (3) months from the date of
termination)  when the Option is granted.  If, at the date of  termination,  the
Optionee  is not  entitled  to  exercise  his or her entire  Option,  the shares
covered by the unexercisable portion of the Option shall revert to the Plan. If,
after  termination,  the Optionee does not exercise his or her Option within the
time  specified in the Option  Agreement,  the Option shall  terminate,  and the
shares covered by such Option shall revert to the Plan.

         (h)  Disability  of  Optionee.  In the event an  Optionee's  Continuous
Service  terminates as a result of the Optionee's  Disability,  the Optionee may
exercise his or her Option,  but only within twelve (12) months from the date of
such termination (or such shorter period specified in the Option Agreement), and
only to the extent that the  Optionee was entitled to exercise it at the date of
such  termination (but in no event later than the expiration of the term of such
Option as set forth in the Option  Agreement).  If, at the date of  termination,
the Optionee is not entitled to exercise  his or her entire  Option,  the shares
covered by the unexercisable portion of the Option shall revert to the Plan. If,
after  termination,  the Optionee does not exercise his or her Option within the
time specified  herein,  the Option shall  terminate,  and the shares covered by
such Option shall revert to the Plan.

         (i) Death of Optionee.  In the event of the death of an  Optionee,  the
Option may be  exercised,  at any time within  twelve (12) months  following the
date of death (or such shorter period specified in the Option Agreement) (but in
no event  later than the  expiration  of the term of such Option as set forth in
the Option Agreement),  by the Optionee's estate or by a person who acquired the
right to exercise the Option by bequest or  inheritance,  but only to the extent
the

                                       7.
<PAGE>

Optionee was  entitled to exercise  the Option at the date of death.  If, at the
time of death,  the  Optionee  was not  entitled to  exercise  his or her entire
Option,  the shares  covered by the  unexercisable  portion of the Option  shall
revert to the Plan.  If,  after  death,  the  Optionee's  estate or a person who
acquired  the right to exercise  the Option by bequest or  inheritance  does not
exercise  the  Option  within  the  time  specified  herein,  the  Option  shall
terminate, and the shares covered by such Option shall revert to the Plan.

         (j) Early Exercise.  The Option may, but need not,  include a provision
whereby  the  Optionee  may elect at any time  while an  Employee,  Director  or
Consultant to exercise the Option as to any part or all of the shares subject to
the Option  prior to the full  vesting of the  Option.  Any  unvested  shares so
purchased  shall be subject to a repurchase  right in favor of the Company or to
any other restriction the Board determines to be appropriate.  The Company shall
exercise its repurchase option to the extent permitted by applicable law.

         (k)  Withholding.  To the  extent  provided  by the  terms of an Option
Agreement,  the Optionee may satisfy any federal, state or local tax withholding
obligation relating to the exercise of such Option by any of the following means
or by a combination of such means: (1) tendering a cash payment; (2) authorizing
the Company to withhold  shares  from the shares of the common  stock  otherwise
issuable to the  participant  as a result of the exercise of the Option;  or (3)
delivering to the Company owned and  unencumbered  shares of the common stock of
the Company.

7.       COVENANTS OF THE COMPANY.

         (a) During the terms of the Options,  the Company shall keep  available
at all times the number of shares of stock required to satisfy such Options.

         (b) The Company shall seek to obtain from each regulatory commission or
agency having  jurisdiction  over the Plan such  authority as may be required to
issue and sell shares of stock upon exercise of the Options; provided,  however,
that this  undertaking  shall not  require  the  Company to  register  under the
Securities  Act either  the Plan,  any  Option or any stock  issued or  issuable
pursuant to any such Option. If, after reasonable efforts, the Company is unable
to obtain from any such  regulatory  commission  or agency the  authority  which
counsel for the Company  deems  necessary  for the lawful  issuance  and sale of
stock under the Plan,  the  Company  shall be relieved  from any  liability  for
failure to issue and sell stock upon  exercise of such Options  unless and until
such authority is obtained.

8.       USE OF PROCEEDS FROM STOCK.

         Proceeds from the sale of stock  pursuant to Options  shall  constitute
general funds of the Company.

                                       8.
<PAGE>

9.       MISCELLANEOUS.

         (a) The Board shall have the power to  accelerate  the time at which an
Option may first be  exercised  or the time  during  which an Option or any part
thereof will vest pursuant to subsection 6(e), notwithstanding the provisions in
the  Option  stating  the time at which it may  first be  exercised  or the time
during which it will vest.

         (b) Neither an Optionee nor any person to whom an Option is transferred
under subsection 6(d) shall be deemed to be the holder of, or to have any of the
rights of a holder with respect to, any shares subject to such Option unless and
until such person has  satisfied  all  requirements  for  exercise of the Option
pursuant to its terms.

         (c) Throughout the term of any Option, the Company shall deliver to the
holder of such  Option,  not later than one hundred  twenty (120) days after the
close of each of the  Company's  fiscal  years  during  the  Option  term,  such
financial  and other  information  regarding the Company as comprises the annual
report to the  stockholders  of the  Company  provided  for in the bylaws of the
Company.

         (d) Nothing in the Plan or any  instrument  executed or Option  granted
pursuant  thereto  shall  confer  upon any  Employee,  Director,  Consultant  or
Optionee any right to continue in the employ of the Company or any Affiliate (or
to continue acting as a Director or Consultant) or shall affect the right of the
Company or any  Affiliate to  terminate  the  employment  or  relationship  as a
Director or Consultant of any Employee, Director, Consultant or Optionee with or
without cause.

         (e) To the extent that the aggregate  Fair Market Value  (determined at
the time of  grant) of stock  with  respect  to which  Incentive  Stock  Options
granted after 1986 are exercisable for the first time by any Optionee during any
calendar  year under all plans of the  Company  and its  Affiliates  exceeds one
hundred  thousand  dollars  ($100,000),  the Options or portions  thereof  which
exceed such limit  (according to the order in which they were granted)  shall be
treated as Nonstatutory Stock Options.

         (f) If an Option is canceled, or deemed to be canceled, for purposes of
Section 162(m) of the Code and the regulations promulgated thereunder,  then the
number of shares subject to the canceled  Option shall continue to count towards
the  maximum  number of shares  which may be granted to any person  pursuant  to
subsection  5(c) of the Plan.  The provisions of this  subsection  9(f) shall be
applicable only to the extent required by Section 162(m) of the Code.

10.      ADJUSTMENTS UPON CHANGES IN STOCK.

         (a) If any change is made in the stock  subject to the Plan, or subject
to any Option (through merger, consolidation, reorganization,  recapitalization,
stock dividend,  dividend in property other than cash, stock split,  liquidating
dividend,  combination  of  shares,  exchange  of

                                       9.
<PAGE>

shares,  change in corporate  structure or otherwise),  the Plan and outstanding
Options will be  appropriately  adjusted in the class(es) and maximum  number of
shares  subject to the Plan and the class(es) and number of shares and price per
share of stock subject to outstanding Options.

         (b) In the event of: (1) a merger or consolidation in which the Company
is not the surviving  corporation;  (2) a reverse merger in which the Company is
the  surviving  corporation  but  the  shares  of  the  Company's  common  stock
outstanding  immediately  preceding  the merger are  converted  by virtue of the
merger  into  other  property,  whether  in the  form  of  securities,  cash  or
otherwise; (3) any other capital reorganization in which more than fifty percent
(50%)  of the  shares  of the  Company  entitled  to vote are  exchanged;  (4) a
transaction  or  group  of  related  transactions  involving  the sale of all or
substantially  all of the Company's  assets;  (5) the acquisition by any person,
entity  or group  (excluding  any  employee  benefit  plan,  or  related  trust,
sponsored or maintained by the Company or any  subsidiary of the Company) of the
beneficial  ownership,  directly or  indirectly,  of  securities  of the Company
representing  more than fifty percent (50%) of the combined  voting power in the
election of directors; or (6) a change in the composition of the Company's Board
of Directors such that, during any period of two consecutive years,  individuals
who, at the  beginning  of such  period,  constitute  the Board,  together  with
individuals  who are Approved New  Directors (as defined  below),  cease for any
reason to have  authority  to cast at least a  majority  of the votes  which all
directors on the Board are entitled to vote;  then, to the extent not prohibited
by law,  the  time  during  which  Options  outstanding  under  the  Plan may be
exercised shall be accelerated  prior to such event, and the Options  terminated
if not  exercised  at or prior to such event.  For  purposes of this  subsection
10(b), an Approved New Director shall be a Board member whose  election,  or the
nomination for election by the Company's stockholders, was approved by a vote of
a majority of the votes  entitled to be cast by  directors  then still in office
who were directors at the beginning of the period.

11.      AMENDMENT OF THE PLAN AND OPTIONS.

         (a) The Board at any time,  and from time to time,  may amend the Plan.
However,  except as provided in Section 10 relating to adjustments  upon changes
in stock, no amendment shall be effective unless approved by the stockholders of
the  Company  within  twelve  (12)  months  before or after the  adoption of the
amendment, where the amendment will:

                  (1) Increase the number of shares  reserved for Options  under
the Plan;

                  (2)   Modify   the   requirements   as  to   eligibility   for
participation in the Plan (to the extent such modification  requires stockholder
approval in order for the Plan to satisfy the requirements of Section 422 of the
Code); or

                  (3)  Modify  the Plan in any  other  way if such  modification
requires  stockholder approval in order for the Plan to satisfy the requirements
of Section 422 of the Code or to comply with the  requirements  of Rule 16b-3 or
any Nasdaq or securities exchange listing requirements.

                                      10.
<PAGE>

         (b) The Board may in its sole discretion  submit any other amendment to
the Plan for stockholder approval,  including, but not limited to, amendments to
the Plan intended to satisfy the  requirements of Section 162(m) of the Code and
the   regulations    promulgated   thereunder   regarding   the   exclusion   of
performance-based  compensation  from the limit on  corporate  deductibility  of
compensation paid to certain executive officers.

         (c) It is expressly  contemplated  that the Board may amend the Plan in
any respect the Board deems necessary or advisable to provide Optionees with the
maximum benefits provided or to be provided under the provisions of the Code and
the  regulations  promulgated  thereunder  relating to Incentive  Stock  Options
and/or to bring the Plan and/or  Incentive  Stock Options  granted under it into
compliance therewith.

         (d) Rights and obligations under any Option granted before amendment of
the Plan  shall not be  impaired  by any  amendment  of the Plan  unless (i) the
Company  requests  the  consent of the person to whom the Option was granted and
(ii) such person consents in writing.

         (e) The Board at any time,  and from time to time,  may amend the terms
of any one or more Options;  provided,  however, that the rights and obligations
under any Option  shall not be  impaired  by any such  amendment  unless (i) the
Company  requests  the  consent of the person to whom the Option was granted and
(ii) such person consents in writing.

12.      TERMINATION OR SUSPENSION OF THE PLAN.

         (a) The Board may  suspend or  terminate  the Plan at any time.  Unless
sooner terminated,  the Plan shall terminate on February 27, 2002 which shall be
within ten (10) years from the date the Plan is adopted by the Board or approved
by the  stockholders  of the Company,  whichever  is earlier.  No Options may be
granted under the Plan while the Plan is suspended or after it is terminated.

         (b) Rights and  obligations  under any Option granted while the Plan is
in effect shall not be impaired by suspension or termination of the Plan, except
with the consent of the person to whom the Option was granted.

13.      EFFECTIVE DATE OF PLAN.

         The Plan shall become  effective  as  determined  by the Board,  but no
Options  granted to acquire shares of the Company's  common stock under the Plan
shall be  exercised  unless and until the issuance of such shares under the Plan
has been approved by the stockholders of the Company.

                                      11.
<PAGE>

                                  PLAN HISTORY

Adopted February 28, 1992
Amended effective as of February 5, 1993
Amended by the Board of  Directors on January 7, 1994 and April 12, 1994
Amended by the Board of Directors on February 24, 1995 and May 1, 1995
Approved by Stockholders on June 6, 1995
Amended  by the  Board  of  Directors  on  December  19,  1995
Approved by the Stockholders on May 23, 1996
Amended by the Board of Directors on December 10, 1996
Approved by the Stockholders on May 21, 1997
Amended by the Board of Directors on February 19, 1998

<PAGE>

                                                                      APPENDIX C


                                  DETACH HERE


                                     PROXY

                                   SUGEN, Inc.

                   PROXY SOLICITED BY THE BOARD OF DIRECTORS
                     FOR THE ANNUAL MEETING OF STOCKHOLDERS
                           TO BE HELD ON MAY 20, 1998

     The undersigned  hereby appoints  STEPHEN  EVANS-FREKE and SUSAN M. KANAYA,
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 SUGEN,  Inc.  which the
undersigned  may be entitled to vote at the Annual  Meeting of  Stockholders  of
SUGEN,  Inc. to be held at the offices of the Company,  located at 351 Galveston
Drive,  Redwood City,  California,  on  Wednesday,  May 20, 1998, 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 meeting

     UNLESS A CONTRARY DIRECTION IS INDICATED,  THIS PROXY WILL BE VOTED FOR ALL
NOMINEES LISTED IN PROPOSAL 1 AND FOR PROPOSALS 2, 3 AND 4, AS MORE SPECIFICALLY
DESCRIBED IN THE PROXY STATEMENT.  IF SPECIFIC INSTRUCTIONS ARE INDICATED,  THIS
PROXY WILL BE VOTED IN ACCORDANCE THEREWITH.

SEE REVERSE                                                          SEE REVERSE
   SIDE            CONTINUED AND TO BE SIGNED ON REVERSE SIDE           SIDE

<PAGE>

                                                            DETACH HERE

<TABLE>
<CAPTION>
[X]Plese mark
   votes as in
   this example.
<S>                                                                  <C>                                      <C>
                                                                     2. To  approve  an   amendment  to  the  FOR  AGAINST ABSTAIN
   MANAGEMENT AND THE BOARD OF DIRECTORS RECOMMEND A                    Company's  1992 Stock Option Plan as  [ ]    [ ]     [ ]
   VOTE FOR THE NOMINEES  FOR DIRECTOR  LISTED BELOW                    amended,  to increase the  aggregate
   AND A VOTE FOR PROPOSALS 2, 3 AND 4.                                 number of  shares  of  Common  Stock
                                                                        available  for  issuance  under  the
   1. To elect two directors to  hold office until the 2001             Plan by 750,000 shares.             
      Annual Meeting of Stockholders.
      Nominees: Stephen Evans-Freke and Axel Ullrich, Ph.D.          3. To  approve  an   amendment  to  the  FOR  AGAINST ABSTAIN
                [ ]  FOR    [ ]  WITHHELD                               Company's     1994      Non-Employee  [ ]    [ ]     [ ]
                     ALL         FROM ALL                               Directors'   Stock  Option  Plan  as
                   NOMINEES      NOMINEES                               amended,  to increase the  aggregate
                                                                        number of  shares  of  Common  Stock
      [ ]                                             MARK HERE [ ]     available  for  issuance  under  the
         --------------------------------------     FOR ADDRESS         Plan by 150,000 shares.             
         For all nominees except as noted above      CHANGE AND
                                                     NOTE BELOW      4. To ratify the  selection  of Ernst &  FOR  AGAINST ABSTAIN 
                                                                        Young LLP as independent auditors of  [ ]    [ ]     [ ]   
                                                                        the  Company  for  its  fiscal  year
                                                                        ending December 31, 1998.           

                                                                     5. To transact such other business as may properly come before
                                                                        the meeting or any adjournments thereof.

                                                                     Plese  vote,  date  and  promptly  return  this  proxy  in the
                                                                     enclosed return envelope which is postage prepaid if mailed in
                                                                     the United States.                                            
                                                                                                                                   
                                                                     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,  gaurdians  and
                                                                     attorneys-in-fact should  add  their  titles.  If  signer is a
                                                                     corporation,  plese 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.                                                       
                                                                     

Signature:                                        Date:              Signature:                                     Date:
          ---------------------------------------      --------------          -------------------------------------     -----------

</TABLE>



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