SUGEN INC
10-Q, 1996-08-14
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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================================================================================

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549
                          -----------------------------

                                    FORM 10-Q
(Mark one)

   X       Quarterly  report  pursuant  to Section 13 or 15(d) of the Securities
- ---------  Exchange Act of 1934.  For the quarterly period ended June 30, 1996.
           or
           Transition  report  pursuant to Section 13 or 15(d) of the Securities
- ---------  Exchange  Act  of 1934. For the transition period from ___________ to
           ___________.


                             Commission File Number:
                                     0-24814
                          -----------------------------

                                   SUGEN, Inc.
             (Exact name of registrant as specified in its charter)

          Delaware                                           13-3629196
(State or other jurisdiction of                          (I.R.S. Employer
 incorporation or organization)                          Identification No.)


               515 Galveston Drive, Redwood City, California 94063
                    (address of principal executive offices)


                                 (415) 306-7700
              (Registrant's telephone number, including area code)


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


Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required to file such reports),  and (2) has been subject to filing requirements
for the past 90 days. Yes  X   No
                         -----   -----

Indicate the number of shares  outstanding  of each of the  issuer's  classes of
common stock, as of the latest  practicable  date.  Common Stock $.01 par value;
10,543,057 shares outstanding at July 31, 1996.


This  report on form 10-Q,  including  all  exhibits,  contains  ___ pages.  The
exhibit index is located on page 14 of this report.


================================================================================

                                        1
<PAGE>

                                   SUGEN, Inc.

                                      INDEX

                                                                        PAGE NO.
                                                                        --------
PART I.  FINANCIAL INFORMATION

Item 1.  Financial Statements and Notes

         Condensed Balance Sheets - June 30, 1996
         and December 31, 1995                                              3

         Statements of Operations - for the three and six months
         ended June 30, 1996 and 1995                                       4

         Condensed Statements of Cash Flows - for the six
         months ended June 30, 1996 and 1995                                5

         Notes to Financial Statements                                      6

Item 2.  Management's Discussion and Analysis of Financial
         Condition and Results of Operations                                7


PART II. OTHER INFORMATION

Item 4.  Submission of Matters to a Vote of Security Holders               11

Item 6.  Exhibits and Reports on Form 8-K                                  12


Signatures                                                                 13


Exhibit Index                                                              14


                                        2
<PAGE>

                         PART I. FINANCIAL INFORMATION

Item 1.   FINANCIAL STATEMENTS AND NOTES

                                  SUGEN, Inc.

                            CONDENSED BALANCE SHEETS
                                 (In thousands)


                                                        June 30,    December 31,
                                                          1996          1995
                                                       ----------   ------------
ASSETS                                                (unaudited)
Current assets:

  Cash and cash equivalents                            $  9,113      $  8,226
  Short-term investments                                 31,125        45,027
  Prepaid expenses and other current asets                  835         1,034
                                                       --------      --------
    Total current assets                                 41,073        54,287

Property and equipment, net                               4,193         4,513
Other assets                                              1,232           443
                                                       --------      --------
                                                       $ 46,498      $ 59,243
                                                       ========      ========

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable                                     $  1,795      $    652
  Accrued liabilities                                     5,316         3,587
  Deferred revenue                                        1,616         6,558
  Capital lease obligations - current portion             1,556         1,354
                                                       --------      --------

    Total current liabilities                            10,283        12,151

Capital lease obligations - non-current portion           3,408         3,651
Commitments
Stockholders' equity:

  Common stock                                           79,728        81,802
  Deferred compensation                                    (303)         (397)
  Accumulated deficit                                   (46,618)      (37,964)
                                                       --------      --------

    Total stockholders' equity                           32,807        43,441
                                                       --------      --------

                                                       $ 46,498      $ 59,243
                                                       ========      ========



                            See accompanying notes.
                                       3

<PAGE>

<TABLE>
                                  SUGEN, Inc.

                            STATEMENTS OF OPERATIONS
                    (In thousands, except per share amounts)
                                  (unaudited)


<CAPTION>
                                                       Three Months Ended    Six Months Ended
                                                            June 30,              June 30,
                                                      -------------------   ------------------
                                                        1996       1995      1996        1995
                                                      -------    -------    -------    -------

<S>                                                   <C>        <C>        <C>        <C>
Revenues:
 Contract revenue (includes amounts from
   related party)                                     $ 4,429    $ 3,448    $ 7,908    $ 6,875

Costs and expenses:
 Research and development                               7,717      5,608     14,332     10,563
 General and administrative                             1,587      1,184      2,967      2,389
                                                      -------    -------    -------    -------
    Total costs and expenses                            9,304      6,792     17,299     12,952
                                                      -------    -------    -------    -------

Operating loss                                         (4,875)    (3,344)    (9,391)    (6,077)

Other income and expenses:
 Interest income                                          598        494      1,288        908
 Interest expense                                        (174)      (104)      (354)      (209)
 Gain on sale of investment in Selectide Corporation      --        --          --       1,006
                                                      -------    -------    -------    -------
    Other income, net                                     424        390        934      1,705
                                                      -------    -------    -------    -------
Net loss                                              $(4,451)   $(2,954)   $(8,457)   $(4,372)
                                                      =======    =======    =======    =======

Net loss per share                                    $ (0.42)   $ (0.34)   $ (0.81)   $ (0.51)
                                                      =======    =======    =======    =======

Shares used in computing net loss
  per share                                            10,500      8,700     10,486      8,651
                                                      =======    =======    =======    =======



<FN>

                            See accompanying notes.
</FN>
</TABLE>

                                       4

<PAGE>

                                  SUGEN, Inc.

                       CONDENSED STATEMENTS OF CASH FLOWS
                Increase (decrease) in cash and cash equivalents
                                 (In thousands)
                                  (unaudited)

                                                               Six Months Ended
                                                                    June 30,
                                                                1996       1995
                                                            --------   --------

Cash flows from operating activities
Net loss                                                    $ (8,457)  $ (4,372)
Adjustments to reconcile net loss to net cash used in
 operating activities:
 Depreciation and amortization                                 1,080        713
 Deferred revenue                                             (4,942)       500
 Gain on sale of investment in Selectide Corporation            --       (1,006)
 Changes in operating assets and liabilities:
   Prepaid expenses and other current assets                     199        113
   Other assets                                                 (789)       (41)
   Accounts payable                                            1,143        135
   Accrued liabilities                                         1,729        582
                                                            --------   --------
Net cash provided by (used in) operating activities          (10,037)    (3,376)
                                                            --------   --------
Cash flows from investing activities
Sales/maturities (purchases) of short-term investments, net   13,705    (16,133)
Purchases of property and equipment                             (666)      (772)
Proceeds from sale of investment in Selectide Corporation       --        2,923
                                                            --------   --------
Net cash provided by (used in) investing activities           13,039    (13,982)
                                                            --------   --------

Cash flows from financing activities
Proceeds from issuance of common stock, net                      424     11,061
Repurchase of common stock                                    (2,698)      --
Proceeds from issuance of warrants                               200       --
Proceeds from lease financing of property and equipment          632        766
Payments under capital lease obligations                        (673)      (398)
                                                            --------   --------
Net cash provided by (used in) financing activities           (2,115)    11,429
                                                            --------   --------

Net increase (decrease) in cash and cash equivalents             887     (5,929)
Cash and cash equivalents at beginning of period               8,226     12,599
                                                            --------   --------
Cash and cash equivalents at end of period                  $  9,113   $  6,670
                                                            ========   ========



                            See accompanying notes.
                                       5

<PAGE>


                                   SUGEN, Inc.

                          NOTES TO FINANCIAL STATEMENTS



1.       Basis of Presentation

         The financial information at June 30, 1996 and for the six months ended
         June 30,  1996 and  1995 is  unaudited  but  includes  all  adjustments
         (consisting only of normal  recurring  adjustments)  which SUGEN,  Inc.
         (the  "Company")  considers  necessary for a fair  presentation  of the
         financial  position  at such date and the  operating  results  and cash
         flows  for  those  periods.   The  accompanying   condensed   financial
         statements should be read in conjunction with the financial  statements
         and notes thereto for the year ended  December 31, 1995 included in the
         Company's  Form  10-K,  as  amended.   The  results  of  the  Company's
         operations for any interim period are not necessarily indicative of the
         results of the Company's operations for a full fiscal year.


2.       Research and Development Collaboration Agreement

         In January  1996,  the Company and Amgen Inc.  reached an  agreement to
         conclude their research  collaboration one year earlier than originally
         planned due to their changed research  priorities over the three years.
         Under the terms of this  wind-down  agreement,  Amgen made a final cash
         payment to the  Company of $2.5  million  (of which  $1.1  million  was
         advanced in December 1995) and forgave certain advance payments made to
         the  Company  for  future  research  work  which  will be  recorded  as
         wind-down  revenue in 1996.  Amgen also granted back to SUGEN exclusive
         worldwide  rights  to  22  proprietary  signal   transduction   targets
         discovered  in the  course of the  collaboration,  subject  to  royalty
         payments back to Amgen with respect to potential  future product sales.
         In addition,  in January 1996 the Company repurchased 235,000 shares of
         its Common  Stock  from  Amgen at a price of $11.48 per share,  thereby
         reducing  Amgen's  current  holdings of the  Company's  Common Stock to
         152,878  shares.  Amgen also  purchased  in January 1996 for $200,000 a
         warrant  expiring in 2003 to purchase 200,000 shares of Common Stock at
         an exercise price of $15.50 per share.


3.       Accrued Liabilities

         The components of accrued liabilities consist of the following:

                                                June 30,        December 31,
                                                  1996              1995
                                              ----------        ------------
                                                      (In thousands)

           Accrued R&D Services                $   2,479         $   1,381
           Accrued Compensation                      758               657
           Accrued Professional Fees                 399               344
           Other                                   1,680             1,205
                                               ---------         ---------
                                               $   5,316         $   3,587
                                               =========         =========



                                        6

<PAGE>

                                   SUGEN, Inc.

Item 2.         MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

     In addition to  historical  information  contained  herein,  the  following
discussion   contains   forward-looking   statements   that  involve  risks  and
uncertainties.  The Company's actual results could differ significantly from the
results discussed in the forward-looking statements. Factors that could cause or
contribute to such  differences  include the factors  discussed below as well as
the factors discussed in the Company's Form 10-K for the year ended December 31,
1995, as amended.

Overview

     SUGEN was founded in July 1991 to discover and develop small molecule drugs
that target specific cellular signal transduction pathways.  These pathways have
been  implicated  in  diseases  such  as  cancer  and  diabetes  as  well  as in
dermatologic,  immunologic,  cardiovascular and neurologic  disorders.  To date,
substantially  all of the Company's  revenue has been pursuant to collaborations
with Zeneca Limited ("Zeneca"),  ASTA Medica  Aktiengesellschaft ("ASTA Medica")
and Amgen Inc.  ("Amgen").  The  Company  intends  to pursue its drug  discovery
programs independently and in collaboration with other pharmaceutical companies.

     In December 1995, the Company  established an oncology product  development
collaboration  with ASTA Medica.  The Company received a $4.0 million technology
set-up fee and will receive  additional  fees upon the  achievement of specified
milestones as well as additional  consideration in the form of contract services
for non-collaboration work. In addition, ASTA Medica purchased 431,137 shares of
SUGEN Common Stock for $9.0 million,  or $20.88 per share.  In January 1996, the
Company and Amgen terminated their research  collaboration one year prior to the
scheduled expiration. In connection with the termination,  Amgen paid SUGEN $2.5
million,  forgave  amounts  previously  advanced,  and purchased  from SUGEN for
$200,000 a warrant to purchase  200,000  shares of Common Stock with an exercise
price of $15.50 per share. In addition, SUGEN repurchased 235,000 of the 387,878
shares of SUGEN Common Stock held by Amgen at $11.48 per share.  The termination
arrangement  further  provides  that the Company  will make  royalty and certain
other  payments to Amgen in the event that  designated  potential  products  are
developed and marketed.

     In April 1996, the Company established a second multi-project Collaborative
Research and Development  Agreement ("CRADA") with the National Cancer Institute
("NCI") for the application of SUGEN's proprietary transcript imaging technology
in  order  to  identify  the  differences  in  expression   patterns  of  signal
transduction  genes that  characterize  each of the sixty tumor cell lines which
constitute the NCI's screening panel.  Interesting lead compounds from the NCI's
collection will be tested in SUGEN's target-specific signal transduction assays,
and lead compounds  from SUGEN also will be tested against the NCI panel.  SUGEN
will have the  option to license  discoveries  made  through  this  process  for
adoption into SUGEN's drug discovery programs.

     The Company has not been  profitable  since  inception and expects to incur
substantial losses for the foreseeable future, primarily due to the expansion of
its  research  and  development  programs,  including  preclinical  studies  and
clinical trials.  The Company expects that losses will fluctuate from quarter to
quarter and that such fluctuations may be substantial.  As of June 30, 1996, the
Company's accumulated deficit was $46.6 million.


Results of Operations

     The  Company's  revenues  for the three and six months  ended June 30, 1996
were $4.4 million and $7.9 million,  respectively,  an increase from revenues of
$3.5 million and

                                        7


<PAGE>


$6.9 million  during the same  periods  last year.  Revenues  for the six months
ended June 30, 1996 included contract revenue from the Zeneca  collaboration and
the partial  recognition of both the $4.0 million technology set-up fee received
in connection with the ASTA Medica  collaboration and the $4.3 million wind-down
fee associated with the Amgen  termination.  The Company  recognizes the revenue
from  technology  set-up fees and wind-down  fees as the related  activities are
performed,  which is generally over a twelve-month  period or less. Through June
30, 1996, a significant  portion of the set-up and wind-down  fees from the ASTA
Medica and Amgen collaborations,  respectively,  had been recognized as revenue.
With  respect to the Amgen  wind-down  fees,  the  Company is  recognizing  $4.3
million in revenue during 1996.  Thereafter,  the Company will not recognize any
additional revenue under the Amgen collaboration.

     Research  and  development  expenses  increased  to $7.7  million and $14.3
million for the three and six months  ended June 30,  1996,  respectively,  from
$5.6  million  and $10.6  million  for the  comparable  periods  last year.  The
increase  during  1996  was  primarily  due  to  the  expenses  associated  with
additional  personnel  committed  to  the  Company's  research  and  development
programs. In addition, the progression of clinical activities, including Phase I
studies of the Company's lead anti-cancer  compound,  SU101, and the advancement
of multiple  programs  through  preclinical  development  contributed  to higher
expenses  during 1996.  The Company  expects  that its research and  development
expenses  will  continue to grow  significantly  during  future years due to the
hiring of personnel,  additional  preclinical  studies, the progression of SU101
clinical  studies,  the  initiation  of new  clinical  trials  and  pursuant  to
requirements under the Company's collaborations.

     General and  administrative  expenses  increased  to $1.6  million and $3.0
million for the three and six months  ended June 30,  1996,  respectively,  from
$1.2 million and $2.4  million in the same  periods last year.  The increase was
primarily due to additional  administrative  staffing, the associated recruiting
and relocation  expenses as well as severance  related costs associated with the
resignation   of  an  officer.   The  Company   expects  that  its  general  and
administrative  expenses  will  continue  to  increase  in order to support  the
Company's research and development  efforts.  In connection with the filing of a
registration  statement  relating to a proposed  follow-on public offering,  the
Company incurred offering related costs in the amount of approximately  $600,000
during the six months  ended June 30,  1996 which may be  expensed in the latter
part of 1996.

     Interest  income  increased  to $598,000 and $1.3 million for the three and
six months ended June 30, 1996, respectively,  from $494,000 and $908,000 earned
in the comparable  periods last year. The increase was due to higher  investment
balances  arising  primarily  from  issuances of the  Company's  capital  stock.
Interest  expense of $174,000  and  $354,000  for the three and six months ended
June 30, 1996,  respectively,  increased from $104,000 and $209,000  incurred in
the same periods last year.  This  increase was  primarily  due to the Company's
continued use of capital lease financing for property improvements and equipment
related to the expansion of its  facilities.  The Company  expects that interest
expense will  continue to increase in 1996 due to the  continued  use of capital
lease financing for equipment and facility improvements.  A $1.0 million gain on
the sale of the Company's  investment in Selectide  Corporation  was included in
other income during 1995.


Liquidity and Capital Resources

     The  Company had cash,  cash  equivalents  and  short-term  investments  of
approximately  $40.2 million at June 30, 1996 compared with approximately  $53.3
million at December 31, 1995. This decrease in cash and  investments  during the
six months  ended June 30,  1996 was  primarily  due to the net loss for the six
month period  combined with the  repurchase  of the Company's  Common Stock from
Amgen  as  discussed   above,   partially  offset  by  an  increase  in  accrued
liabilities.

     Through June 30, 1996,  the Company's  principal  sources of financing were
its  initial  public  offering  of Common  Stock,  placements  of the  Company's
Preferred and Common

                                        8


<PAGE>


Stock and funds  received under the Company's  collaborations  with ASTA Medica,
Zeneca and Amgen. The Company's  current  principal sources of liquidity are its
research and development  collaborations  with ASTA Medica and Zeneca, its cash,
cash  equivalents and short-term  investments and capital lease  financing.  The
Company has a capital  lease line of $3.5  million for the purchase of equipment
and facility improvements, of which $1.3 million was available at June 30, 1996.

     The Company has entered into license and  research  agreements  whereby the
Company funds research  projects  performed by others or  in-licenses  compounds
from third  parties.  Some of the  agreements  may  require  the Company to make
milestone and royalty payments.  Under these programs,  commitments for research
funding  are  approximately  $3.4  million  and $2.0  million  in 1996 and 1997,
respectively.  Most of these  commitments  are cancelable  within a three to six
month period and limit the amounts payable by the Company for sponsored research
under the programs after notice of cancellation by the Company.

     Net additions of equipment and  leasehold  improvements  for the six months
ended June 30, 1996 were  $666,000  compared to $1.0 million for the same period
last year.  Capital  additions  decreased in 1996 due to the timing of equipment
purchases  and  facility  improvements.  Total  capital  spending  for  1996  is
anticipated to remain  comparable to that of the prior year. The Company intends
to  fund  future  capital  expenditures   principally  through  lease  financing
arrangements.  Although  there can be no assurance  that such  financing will be
available.

     The Company  estimates that its existing  capital  resources  together with
facility and equipment financing,  expected revenues from its collaborations and
net income from  investment  activities,  will be sufficient to fund its planned
operations  into 1998.  There can be no assurance  that the  underlying  assumed
levels  of  revenue  and  expense  will  prove  accurate.  Whether  or not these
assumptions  prove to be accurate,  the Company  will need to raise  substantial
additional  capital to fund its  operations.  The  Company  intends to seek such
additional funding through collaborative arrangements,  public or private equity
or debt  financings  and capital lease  transactions;  however,  there can be no
assurance that additional  financing will be available on acceptable terms or at
all.  If  additional  funds are raised by  issuing  equity  securities,  further
dilution to stockholders may result.  In addition,  in the event that additional
funds are  obtained  through  arrangements  with  collaborative  partners,  such
arrangements  may  require the  Company to  relinquish  rights to certain of its
technologies,  product  candidates or products that the Company would  otherwise
seek to develop or  commercialize  itself.  If adequate funds are not available,
the Company may be required to delay,  reduce the scope of or  eliminate  one or
more of its  research  or  development  programs,  which  could  have a material
adverse effect on the Company.

     The Company is at an early stage of  development  and must be  evaluated in
light of the uncertainties and complications present in a biotechnology company.
The  Company  has been in  existence  only since 1991 and to date a single  drug
candidate  (SU101) has entered human  clinical  testing.  To achieve  profitable
operations  on a  continuing  basis,  the Company,  alone or with  collaborative
partners,  must  successfully  develop,  manufacture,  introduce  and market its
proposed products.  Products,  if any, resulting from the Company's research and
development programs are not expected to be commercially  available for a number
of years,  even if they are  developed  successfully  and  proven to be safe and
effective.  Before obtaining regulatory clearance for the commercial sale of any
of  its  products  under  development,  the  Company  must  demonstrate  through
preclinical  studies and clinical trials that the potential  product is safe and
efficacious  for use in  humans  for each  target  indication.  The  failure  to
adequately  demonstrate  the safety and  efficacy  of a product  under  clinical
development could delay or prevent regulatory clearance of the potential product
and could have a material  adverse effect on the Company.  In addition,  many of
the  Company's  currently  proposed  products  are  subject to  development  and
licensing arrangements with the Company's collaborators.  Therefore, the Company
is dependent on the research and development efforts of these collaborators with
respect to some of its proposed products.  The amount and timing of resources to
be devoted to these activities by corporate  partners are not within the control
of the Company. Moreover, the Company is entitled only to a portion of

                                        9


<PAGE>


the revenues,  if any, realized from the commercial sale of any of the potential
productscovered  by the  collaborations in many  jurisdictions.  The Company has
experienced  significant  operating  losses  since its  inception.  The  Company
expects  to incur  significant  operating  losses at least for the next  several
years and expects  cumulative  losses to increase as the Company's  research and
development efforts,  including  preclinical and clinical testing, are expanded.
The  Company's  ability to achieve  profitability  is  dependent on its ability,
alone or with others,  to complete  successfully the development of its proposed
products,  obtain the required regulatory  clearances and manufacture and market
its proposed products. The development of the Company's technology and potential
products will require a commitment of substantial  funds to conduct these costly
and time consuming  activities.  Substantially all of the Company's  revenues to
date have been  received  pursuant to the Company's  collaborations.  Should the
Company or its collaborators fail to perform in accordance with the terms of any
of their  agreements,  any consequent loss of revenue under the agreements could
have a material  adverse  effect on the  Company's  results of  operations.  The
Company has no  manufacturing  facilities and relies on other  manufacturers  to
produce its compounds  for research and  development,  preclinical  and clinical
products.  The potential  products  under  development by the Company never have
been  manufactured  on a  commercial  scale and there can be no  assurance  such
products can be manufactured  at a cost or in quantities  necessary to make them
commercially  viable.  The  Company  has no  sales,  marketing  or  distribution
capability.  If any of its  products  subject to  collaborative  agreements  are
developed  successfully,  the Company must rely on its  collaborators  to market
such products in many jurisdictions.  If the Company develops any products which
are not subject to collaborative  agreements, it must either rely on other large
pharmaceutical companies to market such products or must develop a marketing and
sales force  directly.  The foregoing risks reflect the Company's early stage of
development  and the nature of the Company's  industry and  potential  products.
Also inherent at the  Company's  stage of  development  is a range of additional
risks, including competition,  uncertainties regarding protection of patents and
proprietary   rights,   government   regulation  and   uncertainties   regarding
pharmaceutical pricing and reimbursement.








                                       10


<PAGE>

                           PART II. OTHER INFORMATION



Item 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

(a.)     On May 23, 1996, the Company held its Annual  Meeting of  Stockholders.
         The following actions were taken at the meeting:

(b.)     The following four  directors  were each elected for a three-year  term
         expiring at the 1999 Annual Meeting of Stockholders:

              1.  6,349,471  shares  voted in favor of Heinrich  Kuhn and 90,575
                  shares withheld their vote;
              2.  6,346,290  shares  voted in favor of James L. Tyree and 93,756
                  shares withheld their vote;
              3.  6,349,471  shares  voted in favor of  Glenn S.  Utt,  Jr.  and
                  90,575 shares withheld their vote;
              4.  6,349,471  shares voted in favor of Michael A. Wall and 90,575
                  shares withheld their vote.

         The following individual's term of office as a director continued after
the meeting:

              Stephen Evans-Freke
              Anthony B. Evnin, Ph.D.
              Charles M. Hartman
              Donald E. Nickelson
              Bruce R. Ross
              Richard D. Spizzirri, Esq.
              Axel Ullrich, Ph.D.

(c.)
         1.   A proposal to approve the  Company's  1992 Stock Option  Plan,  as
              amended,  and to  increase  the  number of shares of Common  Stock
              available for issuance under the Plan by 400,000 shares. 4,686,812
              shares were voted in favor of the  proposal,  520,202  shares were
              voted against the proposal,  10,166 shares abstained and 1,222,866
              shares were broker non-votes.

         2.   A proposal to approve the Company's 1994  Non-Employee  Directors'
              Stock  Option  Plan,  as amended,  and to  increase  the number of
              shares of Common Stock  available  for issuance  under the Plan by
              130,000  shares.  4,974,732  shares  were  voted  in  favor of the
              proposal,  204,466 shares were voted against the proposal,  37,982
              shares abstained and 1,222,866 shares were broker non-votes.

         3.   A proposal  to approve the  Company's  1995  Long-Term  Objectives
              Stock  Option Plan for Senior  Management,  as amended.  5,043,827
              shares were voted in favor of the  proposal,  152,767  shares were
              voted against the proposal,  20,586 shares abstained and 1,222,866
              shares were broker non-votes.

         4.   The selection of the Company's  independent auditors was ratified.
              6,421,691  shares  were  voted in favor  of the  proposal,  14,755
              shares were voted against the proposal, 3,600 shares abstained and
              zero shares were broker non-votes.



                                       11

<PAGE>



Item 6.           EXHIBITS AND REPORTS ON FORM 8-K

(a)      Exhibits

Exhibit Number                      Description

        3.1         Restated  Certificate of  Incorporation,  filed February 23,
                    1995. (2)
        3.2(ii)     Bylaws of the Registrant. (1)
        3.3         Certificate of Designation of Series A Junior  Participating
                    Preferred Stock of the Registrant. (3)
       10.51+       Cooperative  Research and Development  Agreement between the
                    Registrant and the National  Cancer  Institute,  dated April
                    12, 1996.
       10.52+       Termination   notice,   dated  May  24,  1996,  between  the
                    Registrant  and  Yissum  Development  Company  of The Hebrew
                    University of Jerusalem (labeled "Sepsis/Inflammation").
       10.53+       Termination   notice,   dated  May  24,  1996,  between  the
                    Registrant  and  Yissum  Development  Company  of the Hebrew
                    University of Jerusalem (labeled "Restenosis").
       27           Financial Data Schedule.

- -------------------------
       +            The  Registrant  has requested  confidential  treatment with
                    respect to portions of this Exhibit.
       (1)          Incorporated by reference to identically  numbered  exhibits
                    filed in response  to Item 16  "Exhibits"  of the  Company's
                    Registration  Statement on Form S-1, as amended (File Number
                    33-77074), which became effective October 4, 1994.
       (2)          Incorporated by reference to identically  numbered  exhibits
                    filed in response  to Item 14  "Exhibits"  of the  Company's
                    Annual  Report of Form 10-K for the year ended  December 31,
                    1994.
       (3)          Filed as an exhibit  to the Form 8-K  Current  Report  dated
                    July 26, 1995 and incorporated herein by reference.

(b)      Reports on Form 8-K

         No  reports on Form 8-K were filed  during the  quarter  ended June 30,
1996.








                                       12

<PAGE>


                                   SUGEN, Inc.

                                   SIGNATURES



Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.



Date:       August 12, 1996                 SUGEN, Inc.




By:       /s/ Stephen Evans-Freke           By:      /s/ Christine E. Gray-Smith
      -----------------------------              -------------------------------
      Stephen Evans-Freke                        Christine E. Gray-Smith
      Chairman and                               Senior Director of Finance
      Chief Executive Officer                    (Principal Financial and
                                                    Accounting Officer)







                                       13

<PAGE>


                                   SUGEN, Inc.

                                  EXHIBIT INDEX



Exhibit No.               Description                          Page in Form 10-Q

    3.1       Restated Certificate of Incorporation, filed
              February 5, 1995. (2)
    3.2(ii)   Bylaws of the Registrant. (1)
    3.3       Certificate of Designation of Series A Junior
              Participating Preferred Stock of the Registrant.(3)
    10.51+    Cooperative Research and Development Agreement
              between the Registrant and the National Cancer
              Institute, dated April 12, 1996.
    10.52+    Termination notice, dated May 24, 1996, between the
              Registrant and Yissum Research Development Company
              of The Hebrew University of Jerusalem (labeled
              "Sepsis/Inflammation").
    10.53+    Termination notice, dated May 24, 1996. between the
              Registrant and Yissum Research Development Company
              of The Hebrew University of Jerusalem (labeled
              "Restenosis").
    27        Financial Data Schedule
- ---------------------

    +         The Registrant has requested confidential treatment
              with respect to portions of this Exhibit.
    (1)       Incorporated by reference to identically numbered
              exhibits filed in response to Item 16 "Exhibits" of
              the Company's Registration Statement on Form S-1,
              as amended (File Number 33-77074), which became
              effective October 4, 1994.
    (2)       Incorporated by reference to identically numbered
              exhibits filed in response to Item 14 "Exhibits" of
              the Company's Annual Report on Form 10-K for the
              year ended December 31, 1994.
    (3)       Filed as an exhibit to the Form 8-K Current Report
              dated July 26, 1995 and incorporated herein by
              reference.





                                14




          CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT,
    MARKED BY BRACKETS, IS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION
   PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.

                                                 CONFIDENTAL TREATMENT REQUESTED

                          EXHIBIT 10.51

                     Cooperative Research and
                      Development Agreement

                           (CACR-0345)

              Characterization of the NCI [REDACTED]

                        Dr. George Johnson

                               DTP
                              DCTDC


                         Dr. Peter Hirth
                           SUGEN, Inc.



                           Prepared by
                 Office of Technology Development
                    National Cancer Institute


<PAGE>

                                                 

                              PUBLIC HEALTH SERVICE

                 COOPERATIVE RESEARCH AND DEVELOPMENT AGREEMENT

This Cooperative Research and Development Agreement, hereinafter referred to as
the "CRADA," consists of this Cover Page, an attached Agreement, a Signature
Page and various Appendices referenced in the Agreement. This Cover Page serves
to identify the Parties to this CRADA:

         (1) the following Bureau(s), Institute(s),  Center(s) or Division(s) of
the National  Institutes  of Health  ("NIH"),  the Food and Drug  Administration
("FDA"),  and the Centers for Disease Control and Prevention  ("CDC"):  National
Cancer Institute,  hereinafter singly or collectively  referred to as the Public
Health Service ("PHS"); and

         (2) SUGEN,  Inc.,  which has offices at 515  Galveston  Drive,  Redwood
City, CA 94063, hereinafter referred to as the "Collaborator."



Although  drafted for two Parties,  the attached  CRADA also may be used for any
number. This Cover Page,  however,  should be modified by repeating block (2) to
identify  other  Parties to the  CRADA.  All  non-PHS  Parties  are  hereinafter
collectively referred to as the "Collaborator." Use of the terms "Collaborator,"
"Party," and "Parties"  should be construed as appropriate for the actual number
of CRADA participants.


<PAGE>

                                                 


                 COOPERATIVE RESEARCH AND DEVELOPMENT AGREEMENT

Article 1.        Introduction

This Cooperative Research and Development  Agreement (CRADA) between PHS and the
Collaborator  will be  effective  when signed by all  Parties.  The research and
development  activities  which will be  undertaken by each of the Parties in the
course of this CRADA are detailed in the Research Plan (RP) which is attached as
Appendix A. The funding and staffing commitments of the Parties are set forth in
Appendix B. Any exceptions or changes to the CRADA are set forth in Appendix C.

Article 2.  Definitions

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

2.1      "Cooperative Research and Development Agreement" or "CRADA" means this
         Agreement, entered into by PHS pursuant to the Federal Technology
         Transfer Act of 1986, as amended, 15 U.S.C. 3710a et seq. and Executive
         Order 12591 of October 10, 1987.

2.2      "Government" means the Government of the United States as represented
         through the PHS agency that is a Party to this agreement.

2.3      "Invention"  means  any  invention  or  discovery  which  is or  may be
         patentable or otherwise  protected  under title 35, United States Code,
         or any novel variety or plant which is or may be protectable  under the
         Plant Variety Protection Act (7 U.S.C. 2321 et seq.).

2.4      "Principal  Investigator(s)"  or "PIs"  means  the  persons  designated
         respectively  by the Parties to this CRADA who will be responsible  for
         the scientific and technical conduct of the RP.

2.5      "Proprietary/Confidential Information" means confidential scientific,
         business, or financial information provided that such information does
         not include:

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

         2.5.2    information  which has been made  available  by its  owners to
                  others without a confidentiality obligation;

         2.5.3    information  which is  already  known by or  available  to the
                  receiving Party without a confidentiality obligation; or

                                      -2-

<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED


         2.5.4    information  which relates to potential  hazards or cautionary
                  warnings  associated with the  production,  handling or use of
                  the subject matter of the Research Plan of this CRADA.

2.6      "Research License" shall mean a nontransferable,  nonexclusive  license
         under any IP license to make and use a licensed  invention for purposes
         of  research  and  not  for  purposes  of  commercial   manufacture  or
         distribution or in lieu of purchase.

2.7      "Research  Materials"  means all tangible  materials other than Subject
         Data first produced in the performance of this CRADA.

2.8      "Research  Plan" or "RP"  means  the  statement  in  Appendix  A of the
         respective research and development  commitments of the Parties to this
         CRADA.

2.9      "Subject  Invention"  means any Invention of the Parties,  conceived or
         first actually  reduced to practice in the  performance of the Research
         Plan of this CRADA.

2.10     "Subject  Data" means all recorded  information  first  produced in the
         performance  of this CRADA by the Parties.

Article 3.       Cooperative Research

3.1      Principal  Investigators.  PHS  research  work under this CRADA will be
         performed  by the PHS  laboratory  identified  in the  RP,  and the PHS
         Principal  Investigator  (PI)  designated in the RP will be responsible
         for the scientific  and technical  conduct of this project on behalf of
         PHS.  Also  designated  in the RP is the  Collaborator  PI who  will be
         responsible for the scientific and technical conduct of this project on
         behalf of the Collaborator.

3.2      Research Plan Change.  The RP may be modified by mutual written consent
         of the Principal Investigators. Substantial changes in the scope of the
         RP will be treated as amendments under Article 13.6.

Article 4.       Reports

4.1      Interim  Reports.  The Parties shall exchange  formal  written  interim
         progress  reports  on a  schedule  agreed  to by the PIs,  but at least
         within  [REDACTED]  after this  CRADA  becomes  effective  and at least
         within every  [REDACTED]  thereafter.  Such reports shall set forth the
         technical  progress  made,  identifying  such problems as may have been
         encountered and  establishing  goals and objectives  requiring  further
         effort, any modifications to the Research Plan pursuant to Article 3.2,
         and all CRADA- related patent applications filed.

4.2      Final  Reports.  The Parties  shall  exchange  formal  reports of their
         results within  [REDACTED] after  completing the projects  described in
         the RP or after the expiration or termination of this CRADA.

                                      -3-

<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED



Article 5.            Financial and Staffing Obligations

5.1      PHS and Collaborator  Contributions.  The contributions of the Parties,
         including payment schedules,  if applicable,  are set forth in Appendix
         B. PHS shall not be obligated to perform any of the research  specified
         herein  or to take  any  other  action  required  by this  CRADA if the
         funding is not  provided as set forth in  Appendix B. PHS shall  return
         excess funds to the Collaborator  when it sends its final fiscal report
         pursuant  to Article  5.2,  except for  staffing  support  pursuant  to
         Article 10.3.  Collaborator  acknowledges that the U.S. Government will
         have the  authority  to retain and  expend  any excess  funds for up to
         [REDACTED]  subsequent to the expiration or termination of the CRADA to
         cover any costs  incurred  during the term of the CRADA in  undertaking
         the work set forth in the RP.

5.2      Accounting  Records.  PHS shall maintain  separate and distinct current
         accounts,  records,  and other evidence  supporting all its obligations
         under this CRADA,  and shall  provide the  Collaborator  a final fiscal
         report pursuant to Article 4.2.

5.3      Capital  Equipment.  Equipment  purchased by PHS with funds provided by
         the  Collaborator  shall be the property of PHS. All capital  equipment
         provided  under this  CRADA by one party for the use of  another  Party
         remains the property of the providing Party unless other disposition is
         mutually  agreed  upon by in writing by the  Parties.  If title to this
         equipment  remains with the providing Party,  that Party is responsible
         for maintenance of the equipment and the costs of its transportation to
         and from the site where it will be used.

Article 6.            Intellectual Property Rights and Patent Applications

6.1      Reporting.  The Parties shall promptly  report to each other in writing
         each Subject Invention resulting from the research conducted under this
         CRADA that is  reported  to them by their  respective  employees.  Each
         Party  shall  report  all  Subject  Inventions  to the  other  Party in
         sufficient  detail to determine  inventorship.  Such  reports  shall be
         treated as  Proprietary/Confidential  Information  in  accordance  with
         Article 8.4.

6.2      Collaborator Employee Inventions. If the Collaborator does not elect to
         retain its IP rights,  the Collaborator  shall offer to assign these IP
         rights to the Subject  Invention to PHS pursuant to Article 6.5. If PHS
         declines such assignment, the Collaborator may release its IP rights as
         it may determine.

6.3      PHS Employee Inventions. PHS on behalf of the U.S. Government may elect
         to  retain  IP rights to each.  Subject  Invention  made  solely by PHS
         employees.  If PHS does not elect to retain IP rights,  PHS shall offer
         to assign these IP rights to such Subject Invention to the Collaborator
         pursuant to Article 6.5. If the Collaborator  declines such assignment,
         PHS may release IP rights in such  Subject  Invention  to its  employee
         inventors pursuant to Article 6.6.

                                      -4-


<PAGE>

                                            


6.4      Joint  Inventions.  Each  Subject  Invention  made  jointly  by PHS and
         Collaborator   employees   shall  be  jointly  owned  by  PHS  and  the
         Collaborator.  The  Collaborator  may elect to file the joint patent or
         other IP  application(s)  thereon and shall  notify PHS  promptly  upon
         making  this  election.  If  the  Collaborator  decides  to  file  such
         applications, it shall do so in a timely manner and at its own expense.
         If the Collaborator does not elect to file such application(s),  PHS on
         behalf of the U.S.  Government  shall  have the right to file the joint
         application(s)  in a timely  manner and at its own  expense.  If either
         Party  decides not to retain its IP rights to a jointly  owned  Subject
         Invention,  it shall  offer to assign  such  rights to the other  Party
         pursuant to Article 6.5. If the other Party  declines such  assignment,
         the  offering  Party may  release its IP rights as provided in Articles
         6.2, 6.3, and 6.6.

6.5      Filing of Patent Applications.  With respect to Subject Inventions made
         by the Collaborator as described in Article 6.2, or by PHS as described
         in  Article  6.3,  a Party  exercising  its right to elect to retain IP
         rights  to a  Subject  Invention  agrees  to file  patent  or  other IP
         applications  in a  timely  manner  and at its own  expense  and  after
         consultation  with the other  Party.  The Party shall  notify the other
         Party of its  decision  regarding  filing in  countries  other than the
         United  States  in a timely  manner.  The Party may elect not to file a
         patent or other IP  application  thereon in any  particular  country or
         countries provided it so advises the other Party ninety (90) days prior
         to the expiration of any applicable filing deadline, priority period or
         statutory bar date, and hereby agrees to assign its IP right, title and
         interest in such country or  countries to the Subject  Invention to the
         other Party and to cooperate in the  preparation and filing of a patent
         or other IP applications.  In any countries in which title to patent or
         other IP rights is transferred to the  Collaborator,  the  Collaborator
         agrees that PHS inventors will share in any royalty  distribution  that
         the Collaborator pays to its own inventors.

6.6      Release to Inventors. In the event neither of the Parties to this CRADA
         elects to file a patent or other IP application on a Subject Invention,
         either or both (if a joint  invention)  may retain or release  their IP
         rights in accordance  with their  respective  policies and  procedures.
         However, the Government shall retain a nonexclusive, non-transferrable,
         irrevocable,   royalty-free   license  to  practice  any  such  Subject
         Invention or have it practiced throughout the world.

6.7      Patent  Expenses.  The  expenses  attendant  to the filing of patent or
         other IP applications  generally shall be paid by the Party filing such
         application.  If an  exclusive  license  to any  Subject  Invention  is
         granted to the Collaborator,  the Collaborator shall be responsible for
         all past and  future  out-of-pocket  expenses  in  connection  with the
         preparation,  filing,  prosecution and maintenance of any  applications
         claiming such exclusively-licensed  inventions and any patents or other
         IP grants that may issue on such  applications.  The  Collaborator  may
         waive its exclusive license rights on any application,  patent or other
         IP grant at any time, and incur no subsequent  compensation  obligation
         for that application, patent or IP grant.

6.8      Prosecution of Intellectual Property Applications.  Within one month of
         receipt or filing, each Party shall provide the other Party with copies
         of the applications  and all 

                                      -5-


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED


         documents  received from or filed with the relevant  patent or other IP
         office in connection  with the prosecution of such  applications.  Each
         Party shall also  provide the other Party with the power to inspect and
         make  copies  of all  documents  retained  in the  patent  or  other IP
         application  files by the applicable  patent or other IP office.  Where
         licensing is contemplated by Collaborator, the Parties agree to consult
         with each other with respect to the prosecution of applications for PHS
         Subject   Inventions   described  in  Article  6.3  and  joint  Subject
         Inventions described in Article 6.4. If the Collaborator elects to file
         and prosecute IP applications on joint Subject  Inventions  pursuant to
         Article 6.4, PHS will be granted an associate power of attorney (or its
         equivalent) on such IP applications.

Article 7.  Licensing

7.1      Option for  Commercialization  License.  With respect to  Government IP
         rights to any Subject  Invention not made solely by the  Collaborator's
         employees  for which a patent  or other IP  application  is filed,  PHS
         hereby  grants to the  Collaborator  an option to elect an exclusive or
         nonexclusive  commercialization  license, which is substantially in the
         form of the appropriate model PHS license  agreement.  This option does
         not apply to Subject  Inventions  conceived prior to the effective date
         of this CRADA if PHS has filed a patent  application  on the  invention
         and has  licensed  it or offered to  license it to a third  party.  The
         terms of the license will fairly  reflect the nature of the  invention,
         the  relative  contributions  of the Parties to the  invention  and the
         CRADA,  the  risks  incurred  by the  Collaborator  and  the  costs  of
         subsequent  research and  development  needed to bring the invention to
         the marketplace.

7.2      Exercise of License Option. The option of Article 7.1 must be exercised
         by written notice mailed within [REDACTED] after collaborator  receives
         written  notice  that the  patent  or other IP  application  is  filed.
         Exercise of this  option by the  Collaborator  initiates a  negotiation
         period that expires [REDACTED] after the patent or other IP application
         filing  date.  If the last  proposal by the  Collaborator  has not been
         responded  to in writing  by PHS within  this  [REDACTED]  period,  the
         negotiation  period shall be extended to expire [REDACTED] after PHS so
         responds,  during [REDACTED] the Collaborator may accept in writing the
         final license proposal of PHS. In the absence of such  acceptance,  PHS
         will be free to license such IP rights to others. In the event that the
         Collaborator  elects the option for an exclusive  license,  but no such
         license is executed  during the negotiation  period,  PHS agrees not to
         make an offer for an  exclusive  license on more  favorable  terms to a
         third  party  for  a  period  of  [REDACTED]   without  first  offering
         Collaborator [REDACTED.]

7.3      Government  Intellectual  Property  Rights.  For  inventions  developed
         wholly by PHS investigators or jointly with a Collaborator,  under this
         CRADA,  pursuant to Articles 6.3 and 6.4, PHS retains,  pursuant to the
         Federal  Technology  Transfer  Act of 1986,  as  amended, 15 U.S.C. ss.
         3710a(b)(2), a nonexclusive,  irrevocable,  paid-up license to practice
         the invention or to have the invention  practiced  throughout the world
         by or on behalf of the U.S. Government. The PHS also reserves the right
         under any  exclusive  IP license to  require  Collaborator  to grant on
         reasonable terms a Research License to third parties.


                                      -6-


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED


7.4      Research  Licenses.  For inventions  developed  wholly by  Collaborator
         under this CRADA,  pursuant to Article 6.2, the Collaborator  agrees to
         grant the  Government  a Research  License,  as defined in Article 2.6,
         which shall be [REDACTED.]

7.5      Joint  Inventions  Not  Exclusively  Licensed.  In the  event  that the
         Collaborator does not acquire an exclusive commercialization license to
         IP  rights in all  fields  in joint  Subject  Inventions  described  in
         Article  6.4,  then each  Party  shall  have the right to use the joint
         Subject  Invention  and to license  its use to others in all fields not
         exclusively licensed to Collaborator.  The Parties may agree to a joint
         licensing approach for such IP rights.

Article 8.  Proprietary Rights and Publication

8.1      Right of Access. PHS and the Collaborator agree to exchange all Subject
         Data  produced  in the course of  research  under this  CRADA,  whether
         developed  solely by PHS or  jointly  with the  Collaborator.  Research
         Materials  will be shared  equally by the  Parties to the CRADA  unless
         other  disposition  is agreed to by the  Parties.  All  Parties to this
         CRADA will be free to utilize  Subject Data and Research  Materials for
         their own purposes, consistent with their obligations under this CRADA.

8.2      Ownership  of  Subject  Data and  Research  Materials.  Subject  to the
         sharing  requirements  of  Paragraph  8.1  and  the  regulatory  filing
         requirements   of  Paragraph  8.3,  the  producing  Party  will  retain
         ownership of and title to all Subject Inventions,  all Subject Data and
         all Research Materials produced solely by their investigators.  Jointly
         developed Subject Inventions,  Subject Data and Research Materials will
         be jointly owned.

8.3      Dissemination  of Subject  Data and Research  Materials.  To the extent
         allowed  under law, the  Collaborator  and PHS agree to use  reasonable
         efforts to keep Subject Data and Research Materials  confidential until
         published or until  corresponding  patent  applications  are filed. Any
         information  that would identify human subjects of research or patients
         will always be maintained  confidentially.  Collaborator shall have the
         exclusive  right to use any and all CRADA  Subject  Data in and for any
         regulatory  filing  by or on behalf of  Collaborator,  except  that PHS
         shall have the  exclusive  right to use Subject Data for that  purpose,
         and  authorize  others  to do so,  if the  CRADA  is  terminated  or if
         Collaborator abandons its commercialization efforts.

8.4      Proprietary/Confidential  Information.  Each Party  agrees to limit its
         disclosure  of  Proprietary/Confidential   Information  to  the  amount
         necessary to carry out the Research Plan of this CRADA, and shall place
         a  confidentiality  notice on all such  information.  Confidential oral
         communications    shall   be   [REDACTED.]    Each   Party    receiving
         Proprietary/Confidential  Information  agrees that any  information  so
         designated  shall be used by it only for the purposes  described in the
         attached  Research  Plan.  Any Party may object to the  designation  of
         information  as  Proprietary/Confidential  Information by another Party
         and may decline to accept such  information.  Subject Data and Research
         Materials  developed  solely by the  Collaborator  may be designated as
         Proprietary/Confidential Information when they are wholly

                                      -7-


<PAGE>

                                                 


         separable  from the  Subject  Data  and  Research  Materials  developed
         jointly with PHS  investigators,  and advance  designation of such data
         and material  categories  is set forth in the RP. The exchange of other
         confidential  information,  e.g.,  patient-identifying  data, should be
         similarly  limited and  treated.  Jointly  developed  Subject  Data and
         Research  Material  derived from the Research  Plan may be disclosed by
         Collaborator to a third party under a confidentiality agreement for the
         purpose of possible  sublicensing  pursuant to the Licensing  Agreement
         and subject to Article 8.7.

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

8.6      Duration of Confidentiality  Obligation. The obligation to maintain the
         confidentiality of Proprietary/Confidential Information shall expire at
         the earlier of the date when the  information is no longer  Proprietary
         Information  as  defined in  Article  2.5 or three (3) years  after the
         expiration or  termination  date of this CRADA.  The  Collaborator  may
         request  an   extension   to  this  term  when   necessary  to  protect
         Proprietary/Confidential  Information  relating  to  products  not  yet
         commercialized.

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

Article 9.  Representations and Warranties

9.1      Representations  and  Warranties  of PHS.  PHS  hereby  represents  and
         warrants to the  Collaborator  that the official signing this CRADA has
         authority to do so.

9.2      Representations and Warranties of the Collaborator.

         (a) The  Collaborator  hereby  represents  and warrants to PHS that the
         Collaborator  has the requisite  power and authority to enter into this
         CRADA  and  to  perform   according   to  its   terms,   and  that  the
         Collaborator's  official signing this CRADA has authority to do 

                                      -8-


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED


         so. The Collaborator  further represents that it is financially able to
         satisfy any funding commitments made in Appendix B.

         (b) The  Collaborator  certifies that the  statements  herein are true,
         complete,  and accurate to the best of its knowledge.  The Collaborator
         is aware that any false, fictitious, or fraudulent statements or claims
         may subject it to criminal, civil, or administrative penalties.

Article 10.  Termination

10.1     Termination By Mutual Consent.  PHS and the  Collaborator may terminate
         this CRADA, or portions thereof, at any time by mutual written consent.
         In  such  event  the  Parties  shall  specify  the  disposition  of all
         property, inventions, patent or other IP applications and other results
         of work  accomplished  or in progress,  arising from or performed under
         this CRADA,  all in accordance  with the rights  granted to the Parties
         under the Terms of this Agreement.

10.2     Unilateral Termination. Either PHS or the Collaborator may unilaterally
         terminate  this entire  CRADA at any time by giving  written  notice at
         least thirty (30) days prior to the desired  termination  date, and any
         rights  accrued  in  property,  patents  or  other IP  rights  shall be
         disposed of as provided in paragraph 10.1.

10.3     Staffing. If this CRADA is mutually or unilaterally terminated prior to
         its expiration, [REDACTED.]

10.4     New  Commitments.  No Party shall make new commitments  related to this
         CRADA after a mutual termination or notice of a unilateral  termination
         and shall, to the extent feasible,  cancel all outstanding  commitments
         and contracts by the termination date.

10.5     Termination  Costs.  Concurrently  with the  exchange of final  reports
         pursuant to Articles 4.2 and 5.2, PHS shall submit to the  Collaborator
         for  payment a  statement  of all costs  incurred  prior to the date of
         termination and for all reasonable termination costs including the cost
         of returning  Collaborator  property or removal of abandoned  property,
         for which Collaborator shall be responsible.

Article 11.  Disputes

11.1     Settlement.  Any dispute arising under this CRADA which is not disposed
         of by  agreement  of the  Principal  Investigators  shall be  submitted
         jointly to the signatories of this CRADA. If the signatories are unable
         to  jointly   resolve  the  dispute   within  thirty  (30)  days  after
         notification  thereof,  the Assistant  Secretary for Health (or his/her
         designee or  successor)  shall  propose a  resolution.  Nothing in this
         Article shall prevent any Party

                                      -9-


<PAGE>

                                                


         from  pursuing  any  additional  administrative  remedies  that  may be
         available  and,  after  exhaustion  of  such  administrative  remedies,
         pursuing all available judicial remedies.

11.2     Continuation  of Work.  Pending the  resolution of any dispute or claim
         pursuant to this  Article,  the Parties agree that  performance  of all
         obligations  shall  be  pursued   diligently  in  accordance  with  the
         direction of the PHS signatory.

Article 12.  Liability

12.1     Property.  The U.S.  Government shall not be responsible for damages to
         any Collaborator  property provided to PHS, where Collaborator  retains
         title to the property, or any property acquired by Collaborator for its
         own use pursuant to this CRADA.

12.2     NO WARRANTIES. EXCEPT AS SPECIFICALLY STATED IN ARTICLE 10, THE PARTIES
         MAKE NO  EXPRESS  OR  IMPLIED  WARRANTY  AS TO ANY  MATTER  WHATSOEVER,
         INCLUDING  THE  CONDITIONS OF THE RESEARCH OR ANY INVENTION OR PRODUCT,
         WHETHER TANGIBLE OR INTANGIBLE, MADE, OR DEVELOPED UNDER THIS CRADA, OR
         THE OWNERSHIP,  MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE OF
         THE RESEARCH OR ANY INVENTION OR PRODUCT.

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

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

Article 13.  Miscellaneous

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

                                      -10-


<PAGE>

                                           


13.2     Entire  Agreement.  This CRADA constitutes the entire agreement between
         the Parties  concerning the subject matter of this CRADA and supersedes
         any prior understanding or written or oral agreement.

13.3     Headings.  Titles and headings of the articles and  subarticles of this
         CRADA are for  convenient  reference  only,  do not form a part of this
         CRADA, and shall in no way affect its interpretation.

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

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

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

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

13.8     Notices.  All notices  pertaining to or required by this CRADA shall be
         in  writing  and shall be signed by an  authorized  representative  and
         shall be delivered by hand or sent by certified  mail,  return  receipt
         requested,  with postage  prepaid,  to the  addresses  indicated on the
         signature  page for each  Party.  Notices  regarding  the  exercise  of
         license  options  shall be made  pursuant to Article 7.2. Any Party may
         change  such  address by notice  given to the other Party in the manner
         set forth above.

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

13.10    Use of Name or Endorsements.  By entering into this CRADA, PHS does not
         directly or indirectly  endorse any product or service provided,  or to
         be  provided,  whether  directly or  indirectly  related to either this
         CRADA  or to  any  patent  or  other  IP  license  or  agreement  which
         implements this CRADA by its successors,  assignees, or licensees.  The

                                      -11-


<PAGE>

                                           


         Collaborator  shall not in any way state or imply that this CRADA is an
         endorsement  of any such product or service by the U.S.  Government  or
         any of its organizational units or employees. Collaborator issued press
         releases  that  reference or rely upon the work of PHS under this CRADA
         shall be made available to PHS at least 7 days prior to publication for
         review and comment.

13.11    Exceptions to this CRADA. Any exceptions or modifications to this CRADA
         that are  agreed to by the  Parties  prior to their  execution  of this
         CRADA are set forth in Appendix C.

13.12    Reasonable  Consent.  Whenever  a  Party's  consent  or  permission  is
         required  under this CRADA,  such  consent or  permission  shall not be
         unreasonably withheld.

Article 14.  Duration of Agreement

14.1     Duration.  It is mutually  recognized that the duration of this project
         cannot be rigidly defined in advance,  and that the  contemplated  time
         periods  for  various  phases of the RP are only good faith  guidelines
         subject to adjustment by mutual  agreement to fit  circumstances as the
         RP proceeds.  In no case will the term of this CRADA extend  beyond the
         term  indicated  in the RP  unless it is  revised  in  accordance  with
         Article 13.6.

14.2     Survivability.  The  provisions of Articles 4.2,  5-8,10.3-10.5,  11.1,
         12.2-12.4,  13.1,  13.10 and 14.2 shall survive the termination of this
         CRADA.

                                      -12-


<PAGE>

                                          



NIH/ADAMHA Patent Policy Board                                       CACR - 0345



                              CRADA SIGNATURE PAGE


FOR NIH:



/s/ Alan S. Rabson                                          4/11/96
- ------------------------------------------------            --------------------
Alan S. Rabson, M.D.                                        Date
Deputy Director, NCI

Mailing Address for Notices:

National Cancer Institute
Office of Technology Development
9000 Rockville Pike
Building 31, Room 4A51
Bethesda, Maryland 20892


FOR THE COLLABORATOR:  (The undersigned  expressly certifies or affirms that the
contents of  any statements  made or reflected in this document are truthful and
accurate.)




/s/ James L. Tyree                                            4/12/96
- ------------------------------------------------            --------------------
Mr. James L. Tyree                                             Date
President

Mailing Address for Notices:

SUGEN, Inc.

515 Galveston Drive

Redwood City, CA 94063

                                       S-1


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED



                                   APPENDIX A

                                  RESEARCH PLAN

TITLE OF CRADA: Characterization of the NCI [REDACTED]

PHS PRINCIPAL INVESTIGATOR: Dr. George Johnson, DTP, DCTDC, NCI

his/her Laboratory: Developmental Therapeutics Program, NCI

COLLABORATOR PRINCIPAL INVESTIGATOR: Dr. Peter Hirth

TERM OF CRADA: [REDACTED]

The Research  Plan which  follows this page should be concise but of  sufficient
detail to permit reviewers of this CRADA to evaluate the scientific merit of the
proposed  collaboration.  The RP should explain the scientific importance of the
collaboration and the research goals of PHS and the Collaborator. The respective
contributions  in  terms  of  expertise  and/or  research  materials  of PHS and
Collaborator should be summarized.  Initial and subsequent projects contemplated
under the RP, and the time periods  estimated  for their  completion,  should be
described  and pertinent  methodological  considerations  summarized.  Pertinent
literature references may be cited and additional relevant information included.
Include  additional  pages to identify the Principal  Investigators of all other
Parties to this CRADA.


                                      -14-


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED


                                   APPENDIX A

                                  RESEARCH PLAN

                                 NCI CRADA # 345

                                 Title of CRADA

                     Characterization of the NCI [REDACTED]









<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED



Appendix A - Confidential                                              CRADA 345

NCI/SUGEN




                                   [REDACTED]






                               A-2


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED



Appendix A - Confidential                                              CRADA 345

NCI/SUGEN




                                   [REDACTED]






                               A-3


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED



Appendix A - Confidential                                              CRADA 345

NCI/SUGEN




                                   [REDACTED]






                               A-4


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED



Appendix A - Confidential                                              CRADA 345

NCI/SUGEN




                                   [REDACTED]






                               A-5


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED






                                   [REDACTED]




                               A-6


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED



                                   [REDACTED]





                               A-7


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED



                                   [REDACTED]





                               A-8


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED



                                   [REDACTED]





                               A-9


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED



                                   [REDACTED]





                               A-10


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED



                                   [REDACTED]





                               A-11


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED



                                   [REDACTED]





                               A-12


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED



                                   [REDACTED]





                                      A-13

 
<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED

Appendix A - Confidential                                              CRADA 345
NCI/SUGEN



                                   [REDACTED]





                                      A-14

<PAGE>

                                             
                                   APPENDIX B

               FINANCIAL AND STAFFING CONTRIBUTIONS OF THE PARTIES







                                      -15-

<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED

                                                                    Confidential

                                   APPENDIX B

               Financial and Staffing Contributions of the Parties

For NIH:

The Developmental  Therapeutics  Program,  (DTP) DCTDC estimates that [REDACTED]
will be  dedicated  to its  participation  in the  research  under  this  CRADA.
[REDACTED]

NCI  will  provide  no  funding  to  Company  for  collaborative   research  and
development pursuant to this CRADA,  inasmuch as financial  contributions by the
U.S.  government to  non-Federal  parties under a CRADA is prohibited  under the
Federal Technology Transfer Act of 1986 (15 U.S.C. ss.3710 a(d)(1)).

For SUGEN, Inc.:

Personnel:

SUGEN,  Inc. intends to commit  [REDACTED] to permit the timely execution of the
studies  implemented  under this CRADA. More  specifically,  this staffing shall
include  SUGEN  [REDACTED]  dedicated to the research  and  development  for the
[REDACTED] performed under this CRADA.

Funding:

For the [REDACTED]

SUGEN will also  provide  funds,  in the  amount of  [REDACTED]  to provide  for
appropriate and mutually  agreeable travel and training for NCI staff related to
the research and development under this CRADA

No funds provided under this CRADA by SUGEN will be used by NCI to [REDACTED]

Should any of the nominal funds remain,  NCI or the NCI  contractor  will return
excess funds to the Collaborator when it sends its final fiscal report.

Payments  for the  [REDACTED]  under this  CRADA  shall be made to DTP or to DTP
contractors as appropriate.


                                      B-1

<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED

                                                                    Confidential


Payments by SUGEN to NCI for [REDACTED]  will be made only after  execution of a
separately negotiated and mutually agreeable written amendment to this CRADA.





                                      B-2

<PAGE>

                                              

 

                                   APPENDIX C

                    EXCEPTIONS OR MODIFICATIONS TO THIS CRADA





                                       16


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED

                                                                    Confidential


                                   APPENDIX C

                    EXCEPTIONS OR MODIFICATIONS TO THIS CRADA

Add a new Article 3.3 as follows:

3.3      Research  Team.  The Parties  agree to  establish a joint  research and
         development team (hereinafter  referred to as the "Team") comprising at
         least the Principal Investigators designated pursuant to Article 3.1 to
         conduct and monitor the research in  accordance  with the RP.  Although
         the members of the Team shall be considered as having been delegated to
         the Team,  they shall continue to remain  employed by their  respective
         employers  under  their  respective  terms of  employment.  The initial
         composition  of the Team shall be 2 voting  members on behalf of SUGEN,
         including the Collaborator Principal  Investigator  designated pursuant
         to Article 3.1, and [REDACTED]  designated pursuant to Article 3.1. The
         chair of the Team will  alternate  on a yearly  basis  between  NCI and
         SUGEN.  The  membership of the Team may be changed from time to time as
         mutually agreed by NCI and SUGEN

Add a new Article 3.4 as follows:

3.4      Exclusive  Collaborator for Subject Research Project:  The scope of the
         CRADA Research Plan (Appendix A) will be  appropriately  and explicitly
         defined by the  [REDACTED]  as agreed upon by the Parties  prior to the
         execution of this Agreement,  and will be modifiable after execution of
         the CRADA only by  written  amendment.  NCI  agrees  that SUGEN will be
         designated  as the  exclusive  collaborator  with  NCI with  regard  to
         [REDACTED] designated and,  accordingly,  NCI will not collaborate with
         any other commercial entity with regard to the designated [REDACTED]

Add a new Article 3.5 as follows:

3.5      Additional Research:  SUGEN and NCI shall be free to sponsor additional
         [REDACTED]  outside the scope of this CRADA.  As agreed by the Parties,
         [REDACTED] is limited to the scope of this CRADA.

Add the following to the end of Article 4.1 Interim Reports:

         "Reports from the Research Team or copies of screening results updating
         the  progress  of  the  CRADA  research  shall  satisfy  the  reporting
         requirements under this Article 4.1."

Revise the first two sentences of Article 7.2 to read as follows:


                                       C-1

<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED
Appendix C -- Confidential
NCI/SUGEN                                                              CRADA 345

         "The option of Article 7.1 must be exercised by written  notice  mailed
         within [REDACTED] after  collaborator  receives written notice that the
         patent or other IP application is filed. Exercise of this option by the
         Collaborator  initiates a  negotiation  period that  [REDACTED] of said
         license option."

Article 8.6 shall be modified by adding the following paragraphs to the end:

         Notwithstanding the previous paragraph, [REDACTED] under the CRADA will
         be held in  confidence  by the  parties  for a period not to exceed one
         year.  For  [REDACTED] a period  longer than one year,  up to a maximum
         period  of 3  years,  will be  accommodated  by NCI  only  upon  mutual
         agreement of the Parties.  Conversely,  [REDACTED] may become  publicly
         available  during the one year period only upon mutual agreement of the
         Parties. The time period begins when NCI provides SUGEN with [REDACTED]
         SUGEN  understands that NCI may  periodically  make requests to publish
         data  during the one year  period  when it would be  beneficial  to the
         [REDACTED]  in general.  These  requests by NCI will be  primarily  for
         dissemination  of important  information  and shall not be unreasonably
         denied by SUGEN.

         Data which relates either to [REDACTED]  produced by the Parties may be
         published by NCI only after SUGEN has had the opportunity to review the
         manuscript in accordance with Article 9.6 of this Agreement.  SUGEN may
         redact any  proprietary  and  confidential  information  as  reasonably
         appropriate.

         Provided that the Parties either  individually  or jointly (as mutually
         agreed) are actively  developing  any [REDACTED] the Parties agree that
         the proprietary  information relating to the identity and nature of the
         [REDACTED] produced by NCI and SUGEN will not be disclosed to any other
         party prior to entrance of the [REDACTED] Active  development should be
         interpreted by the parties to mean a reasonable rate of progress on any
         promising [REDACTED] The active development of each [REDACTED] shall be
         addressed in each regular  Interim Report pursuant to Article 4 of this
         Agreement.  Concerns by NCI related to the  progress of  [REDACTED]  by
         SUGEN shall be forwarded to SUGEN in writing and subsequently addressed
         by SUGEN in the next Interim Report or six months later, whichever date
         is later.

         For the purposes of this Agreement,  "Publication" means any written or
         oral dissemination or any other public dissemination of the information
         including posting of the information on the World Wide Web or Internet.


                                      C-2

<PAGE>


                                            
Appendix C -- Confidential
NCI/SUGEN                                                              CRADA 345

Add a new Article 8.8 as follows:

8.8      Providing  Subject Data produced by NCI to non-CRADA  Parties by SUGEN.
         Because NCI has a duty to protect the integrity and quality of the Data
         generated by the NCI under this Agreement, Subject Data which have been
         provided  to  Collaborator  may be made  available  to a third party by
         Collaborator subject to the following conditions:

         a.   Access to the  NCI-produced  Subject Data by a third party must be
              deemed  necessary  by  Collaborator  for  the  development  and/or
              commercialization  of the CRADA  technology  (ie. Said third party
              will play a role in the development or regulatory  approval of the
              technology  or  any  agent(s); 

         b.   Collaborator  agrees to keep accurate  records of all transfers of
              NCI Subject data to a third party;

         c.   All transfers of NCI Subject data to a third party by Collaborator
              shall  be  protected  by  terms  of  Confidentiality  at  least as
              restrictive  as  the  terms  of  Confidentiality  which  bind  the
              transfer of data from NCI to Collaborator; 

         d.   NCI data may not be sold or transferred for any consideration to a
              third  party by  Collaborator;  and 

         e.   Data which is transferred  either to  Collaborator  by NCI or to a
              third party by Collaborator shall be maintained in essentially the
              same form as it was received from the NCI.


                                      C-3

<PAGE>




                                             
Appendix D -- Confidential
NCI/SUGEN                                                              CRADA 345

                                   APPENDIX D

         Intellectual Property, Licensing, and Other Related Agreements

1)  A Letter of Intent  (LOI) for the  Subject  CRADA was  executed  between the
Parties on December 11, 1995. A copy is attached hereto.

2)  SUGEN  currently  is the  CRADA  collaborator  with  NCI  for  the  Clinical
Development  of SU-101.  NCI CRADA # 294 was executed on August 14, 1995 with an
effective date of May 25, 1995.



                                      D-1

<PAGE>


                                                CONFIDENTIAL TREATMENT REQUESTED

                                                                        Tom Mays

                                                            Document Type:  Lett
                                                      File Number:  CRADA #00345
DEPARTMENT OF HEALTH & HUMAN SERVICES
- --------------------------------------------------------------------------------
                                                   National Institutes of Health
                                                       National Cancer Institute
                                                            Office of Technology
                                                                     Development
                                                             9000 Rockville Pike
                                                            Bldg.  31, Room 4A51
                                                        Bethesda, Maryland 20892
                                                                  (301) 496-0477
                                                              (301) 402-2117 fax

December 4, 1995

Mr.  Stephen Evans-Freke
Chairman and CEO
SUGEN, Inc.
515 Galveston Drive
Redwood City, CA 94063

Re:         Proposed Cooperative Research and Development Agreement (CRADA)
CRADA #:    345
NCI Principal Investigator:   Dr.  George Johnson
Collaborator Investigator:    Dr.  Peter Hirth
Title:   Characterization of the [REDACTED]

Dear Mr. Evans-Freke,

It is my  understanding  that a  cooperative  research and  development  project
between the parties referenced below is being considered.  Accordingly,  until a
formal Collaborative  Research and Development  Agreement (CRADA) is reviewed by
the CRADA  Subcommittee and approved by the Director,  National Cancer Institute
(NCI), this Letter is offered to permit joint research to commence.

It is acknowledged by the parties below that  cooperative  research  pursuant to
the Research Plan,  attached as Appendix A, will be conducted  informally by the
NCI Principal  Investigator  and  Collaborator  pending formal  approval of this
CRADA. It is further acknowledged that patentable  inventions may be made by NCI
employees and  employees of the  Collaborator.  Pursuant to its authority  under
Federal  Technology  Transfer Act of 1986,  NCI agrees that should this CRADA be
approved,  it will have  retroactive  effect to the date that the last party has
executed  the Letter  for any  inventions  that may be made under this  Research
Plan.  NCI further  agrees that this CRADA will have  retroactive  effect to the
date  


                                      -1-


<PAGE>


                                                CONFIDENTIAL TREATMENT REQUESTED


that  the  last  party  has  executed  this  Letter  for   confidentiality
obligations specified in the NIH Model CRADA. The NIH Model CRADA provisions for
the protection of proprietary  information are incorporated by reference and are
considered  controlling.  These  provisions  include,  but are not  limited  to,
Articles 2.2 and 9.1-9.7. The NIH Model CRADA is attached as Appendix B.

Prior to the  execution  of the  CRADA,  SUGEN and NCI will  jointly  generate a
[REDACTED]  which  will be the  subject  of this  CRADA.  The scope of the CRADA
Research Plan will be appropriately and explicitly defined by the [REDACTED] and
will be  modifiable  after  execution  of the CRADA only by  written  amendment.
Additionally,  NCI agrees that the CRADA will  designate  SUGEN as the exclusive
collaborator  with  NCI  for  the   characterization   of  the  [REDACTED]  and,
accordingly,  NCI will not  collaborate  with any other  commercial  entity with
regard to the designated [REDACTED]

Finally,  the Parties  recognize  that the U.S.  Public  Health  Service  policy
relating to the "Pricing"  clause formerly at Article 8.3 of the NIH Model CRADA
and at  Article  5.04 of the PHS  Model  Exclusive  License  Agreement  has been
rescinded. Consequently, said "Pricing" clause will be deleted and will be of no
force and effect in this CRADA, if subsequently approved and executed, or in any
subsequent exclusive licenses granted on Subject Inventions under this CRADA.

You  understand,  however,  that this letter is not a commitment  on the part of
either party to enter into a CRADA. Further, this Letter is effective for a term
of [REDACTED] The [REDACTED]  term may be extended,  provided the CRADA is under
active  negotiation and the collaborative  research is continuing.  Assuming the
necessary   approvals  are   forthcoming,   we  look  forward  to  a  successful
collaboration.

Sincerely,

/s/ Thomas D. Mays

Thomas D.  Mays, Ph.D., J.D.
Director, NCI Office of Technology Development

- --------------------------------------------------------------------------------
ACCEPTED AND AGREED TO:

National Cancer Institute                   SUGEN, Inc.

/s/ Alan S. Rabson                          /s/ Stephen Evans-Freke
- ----------------------------------          ------------------------------------
Alan S. Rabson, M.D.                        Mr. Stephen Evans-Freke
Deputy Director, NCI                        Chairman and CEO

12/6/95                                     12/11/95
- ----------------------------------          ------------------------------------
Date                                        Date


                                      -2-

<PAGE>


                                             


Attachments:

         Appendix A: LOI Research Plan
         Appendix B: NCI Model CRADA

cc:      Mr. Dan Kiser, Esq., Fox, Bennett & Turner
         Dr. George Johnson, DCTDC, NCI




                                      -3-

<PAGE>


                                                CONFIDENTIAL TREATMENT REQUESTED


                    Letter of Intent Research Plan Appendix A

                                  Introduction

The  proposed  Cooperative  Research  and  Development  Agreement  (CRADA)  will
encompass a joint  collaborative  research effort on the parts of NCI and SUGEN,
Inc. in the projects as detailed below. The general  description of the research
project will be [REDACTED] identified through these collaborative efforts may be
the subject of a formally  executed and mutually  agreeable written amendment to
the executed CRADA for further  preclinical  testing  possibly  leading to human
clinical trials (Project 4).

                      Overview and Objectives of This CRADA

                                    PROJECT 1

Overview

o        The  Parties  will  collaborate  on  the   characterization   of  NCI's
         [REDACTED]  (Prior to the  execution  of the CRADA,  SUGEN and NCI will
         provide a [REDACTED] which will be the subject of this CRADA. The scope
         of the CRADA Research Plan will be appropriately and explicitly defined
         by the [REDACTED]  and will be modifiable  after execution of the CRADA
         only by  written  amendment.  The  CRADA  will  designate  SUGEN as the
         [REDACTED] with regard to the designated  [REDACTED] and,  accordingly,
         NCI will not collaborate with any other  commercial  entity with regard
         to the designated [REDACTED]

o        NCI's [REDACTED]

o        SUGEN will perform [REDACTED] against the [REDACTED]

Objectives

o        With  this  information,  the  Collaborators  will  learn  if  the  NCI
         [REDACTED]


o        The results from  obtaining  this  information  could be the [REDACTED]
         SUGEN and NCI could also use the [REDACTED]



                                    LOI-A-1

<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED

CRADA Letter of Intent Research Plan                                   CRADA 345
NCI-SUGEN                                                             Appendix A


         [REDACTED]

Resources

o        NCI will provide [REDACTED] to SUGEN.
o        SUGEN will perform [REDACTED]
o        SUGEN and NCI will jointly develop [REDACTED]

                            PROJECT 2

Overview

o        SUGEN's [REDACTED]

o        NCI's [REDACTED]

o        SUGEN will perform [REDACTED]

Objectives

o        The profiling of SUGEN's  [REDACTED] in NCI's [REDACTED] could identify
         utility in different [REDACTED]

o        The [REDACTED]

o        From  the  search  of  NCI's   [REDACTED]   could  be  identified   for
         development.

Resources

o        SUGEN will provide [REDACTED]
o        NCI will test [REDACTED]
o        NCI will [REDACTED]

                                    LOI-A-2

<PAGE>

                                                CONFIDENTIAL TREATMENT REQUESTED

CRADA Letter of Intent Research Plan                                   CRADA 345
NCI-SUGEN                                                             Appendix A


                                    PROJECT 3

Overview

o        [REDACTED]




LOI-A-3



          CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT,
    MARKED BY BRACKETS, IS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION
   PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.

                                                

                               Termination Notice

YISSUM RESEARCH DEVELOPMENT COMPANY
OF THE HEBREW UNIVERSITY OF JERUSALEM
of 46 Jabotinsky Street, Jerusalem (hereinafter "Yissum"),

and

SUGEN, INC.

of 515 Galveston Drive, Redwood City, California, U.S.A.
(hereinafter "SUGEN"),

WHEREAS

         Yissum and SUGEN are parties to an Amended and  Restated  Research  and
License  Agreement  "Sepsis/Inflammation"  effective January 1, 1994, as amended
and restated January 5, 1996 (the "Research Agreement").

WHEREAS,

         On May 24, 1996, the Research was cancelled and the Research  Agreement
         was terminated effective as of June 30, 1996.

NOW, THEREFORE, it is hereby declared and agreed between the parties,  intending
to be legally bound, as follows:

1.   The  definitions  and  references  to the  Research  Agreement in the above
     introduction are an integral part of this Notice. All capitalized terms not
     defined herein shall have the same meaning as in the Research Agreement.

2.   Yissum hereby  acknowledges  that all its right,  title and interest in the
     Proprietary  Rights  related to the Listed  Compounds  listed on Appendix I
     hereto  and  any  modifications,   analogs  or  derivatives   thereof  (the
     "Technology") are subject to the terms of the Research Agreement.

3.   SUGEN  hereby  assigns to Yissum all its right,  title and  interest in the
     Proprietary  Rights  related to the HUJ Compounds  not included  within the
     Technology.  From the date of the signing of this  Notice,  Yissum shall be
     independently  entitled to take any action  regarding the HUJ Compounds not
     included  within the Technology,  including to sell,  license or effect any
     other disposition thereof and SUGEN shall not have any other rights to such
     compounds.


<PAGE>

                                                

4.   SUGEN  shall  perform  all the  necessary  actions  in order to effect  the
     transfer  of rights in the  Proprietary  Rights  to the HUJ  Compounds  not
     included within the Technology,  and shall sign the documents  necessary to
     effect the transfer including the patent assignment  documents  appropriate
     for each involved country and any additional document required to implement
     the said transfer and assignment. Yissum shall be responsible for all legal
     and  governmental  fees  associated  with the  preparation,  filing  and/or
     recording of said assignments and documents.

5.   The parties  further agree that, if it should be determined that any of the
     Proprietary  Rights with respect to the  Technology in the case of SUGEN or
     the HUJ Compounds not included  within the Technology in the case of Yissum
     are dominant to any of the Proprietary Rights of the other party hereto, it
     does  grant  an  exclusive  license  to the  other  party  (with  right  to
     sublicense) to practice any such dominant  Proprietary  Rights for the sole
     and limited purpose of practicing the  Proprietary  Rights as otherwise set
     forth herein.

6.   All notices  and  communications  pursuant to this Notice  shall be made in
     writing by registered  mail such as  international  Federal Express or such
     other courier  service  providing a written  record of such mailing and its
     receipt,  and shall be deemed to have been received by the receiving  party
     96 hours after being posted,  unless the written record provided for herein
     establishes that delivery was not made until a later date.

7.   The  provisions of this Notice and everything  concerning the  relationship
     between the parties in accordance with this Notice shall be governed by law
     of England and Wales.

Dated: as of June 30, 1996

Yissum Research Development Company SUGEN, Inc.
of the Hebrew University of Jerusalem

By:       /s/ Uri Litvin                     By:      /s/ James L. Tyree
   ------------------------------               ------------------------------

         Name:                                        Name:
         Title:                                       Title:



<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED



                                   Appendix I

                                Listed Compounds

                                     Sepsis



                                   [REDACTED]






          CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT,
    MARKED BY BRACKETS, IS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION
   PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.



                               Termination Notice

YISSUM RESEARCH DEVELOPMENT COMPANY
OF THE HEBREW UNIVERSITY OF JERUSALEM
of 46 Jabotinsky Street, Jerusalem (hereinafter "Yissum"),

and

SUGEN, INC.
of 515 Galveston Drive, Redwood City, California, U.S.A.
(hereinafter "SUGEN"),

WHEREAS

         Yissum and SUGEN are parties to an Amended and  Restated  Research  and
License  Agreement  "Restenosis"  effective  January  1, 1994,  as  amended  and
restated January 5, 1996 (the "Research Agreement").

WHEREAS,

         On May 24, 1996, the Research was cancelled and the Research  Agreement
         was terminated effective as of June 30, 1996.

NOW, THEREFORE, it is hereby declared and agreed between the parties,  intending
to be legally bound, as follows:

1.   The  definitions  and  references  to the  Research  Agreement in the above
     introduction are an integral part of this Notice. All capitalized terms not
     defined herein shall have the same meaning as in the Research Agreement.

2.   Yissum hereby  acknowledges  that all its right,  title and interest in the
     Proprietary  Rights  related to the Listed  Compounds  listed on Appendix I
     hereto  and  any  modifications,   analogs  or  derivatives   thereof  (the
     "Technology") are subject to the terms of the Research Agreement.

3.   SUGEN  hereby  assigns to Yissum all its right,  title and  interest in the
     Proprietary  Rights  related to the HUJ Compounds  not included  within the
     Technology.  From the date of the signing of this  Notice,  Yissum shall be
     independently  entitled to take any action  regarding the HUJ Compounds not
     included  within the Technology,  including to sell,  license or effect any
     other disposition thereof and SUGEN shall not have any other rights to such
     compounds.



<PAGE>




4.   SUGEN  shall  perform  all the  necessary  actions  in order to effect  the
     transfer  of rights in the  Proprietary  Rights  to the HUJ  Compounds  not
     included within the Technology,  and shall sign the documents  necessary to
     effect the transfer including the patent assignment  documents  appropriate
     for each involved country and any additional document required to implement
     the said transfer and assignment. Yissum shall be responsible for all legal
     and  governmental  fees  associated  with the  preparation,  filing  and/or
     recording of said assignments and documents.

5.   The parties  further agree that, if it should be determined that any of the
     Proprietary  Rights with respect to the  Technology in the case of SUGEN or
     the HUJ Compounds not included  within the Technology in the case of Yissum
     are dominant to any of the Proprietary Rights of the other party hereto, it
     does  grant  an  exclusive  license  to the  other  party  (with  right  to
     sublicense) to practice any such dominant  Proprietary  Rights for the sole
     and limited purpose of practicing the  Proprietary  Rights as otherwise set
     forth herein.

6.   All notices  and  communications  pursuant to this Notice  shall be made in
     writing by registered  mail such as  international  Federal Express or such
     other courier  service  providing a written  record of such mailing and its
     receipt,  and shall be deemed to have been received by the receiving  party
     96 hours after being posted,  unless the written record provided for herein
     establishes that delivery was not made until a later date.

7.   The  provisions of this Notice and everything  concerning the  relationship
     between the parties in accordance with this Notice shall be governed by law
     of England and Wales.

Dated: as of June 30, 1996

Yissum Research Development Company SUGEN, Inc.
of the Hebrew University of Jerusalem

By:       /s/ Uri Litvin                     By:      /s/ James L. Tyree
   ------------------------------               ------------------------------

         Name:                                        Name:
         Title:                                       Title:



<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED



                                   Appendix I

                                Listed Compounds

                                   Restenosis



         SUGEN ID                             Supplier Name


                                   [REDACTED]



<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED



         SUGEN ID                             Supplier Name



                                   [REDACTED]


<PAGE>

                                                 CONFIDENTAL TREATMENT REQUESTED



         SUGEN ID                             Supplier Name


                                   [REDACTED]



<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>
     THE SCHEDULE  CONTAINS  SUMMARY  FINANCIAL  INFORMATION  EXTRACTED FROM THE
COMPANY'S  FORM 10-Q FOR THE THREE MONTHS ENDED JUNE 30, 1996.  AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>                    1,000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1996
<PERIOD-START>                                 JAN-01-1996
<PERIOD-END>                                   JUN-30-1996
<CASH>                                           9,113
<SECURITIES>                                    31,125
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                41,073
<PP&E>                                           7,385
<DEPRECIATION>                                   3,192
<TOTAL-ASSETS>                                  46,498
<CURRENT-LIABILITIES>                           10,283
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<COMMON>                                        79,728
                                0
                                          0
<OTHER-SE>                                     (46,921)
<TOTAL-LIABILITY-AND-EQUITY>                    46,498
<SALES>                                              0
<TOTAL-REVENUES>                                 7,908
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                14,332
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 354
<INCOME-PRETAX>                                 (8,457)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                             (8,457)
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<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    (8,457)
<EPS-PRIMARY>                                    (0.81)
<EPS-DILUTED>                                    (0.81)
        


</TABLE>


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