SUGEN INC
10-Q, 1998-08-14
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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================================================================================

                                  UNITED STATES
                       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, 1998.

           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.)
                                                  

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

                                 (650) 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;
16,165,399 shares outstanding at July 31, 1998.

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

<PAGE>

                                   SUGEN, Inc.

                                      INDEX

                                                                        PAGE NO.
PART I.  FINANCIAL INFORMATION

Item 1.           Financial Statements and Notes

                  Condensed Balance Sheets - June 30, 1998
                  and December 31, 1997                                   3

                  Statements of Operations - for the three and six
                  months ended June 30, 1998 and 1997                     4

                  Condensed Statements of Cash Flows - for the six
                  months ended June 30, 1998 and 1997                     5

                  Notes to Financial Statements                           6

Item 2.           Management's Discussion and Analysis of Financial
                  Condition and Results of Operations                     8

PART II. OTHER INFORMATION

Item 2.           Changes in Securities and Use of Proceeds               13

Item 4.           Submission of Matters to a Vote of Security Holders     13

Item 5.           Other Information                                       14

Item 6.           Exhibits and Reports on Form 8-K                        14

Signatures                                                                15

Exhibit Index                                                             16




                                       2


<PAGE>







                          PART I. FINANCIAL INFORMATION

Item 1.   FINANCIAL STATEMENTS AND NOTES


                                   SUGEN, Inc.

                            CONDENSED BALANCE SHEETS
                                 (In thousands)


                                                          June 30,  December 31,
                                                           1998         1997
                                                         ---------    ---------
ASSETS                                                  (unaudited)      (1)
Current assets:
        Cash and cash equivalents                        $  15,792    $  23,816
        Short-term investments                              46,694       51,479
        Accounts receivable                                    204          237
        Prepaid expenses and other current assets              778          754
                                                         ---------    ---------
              Total current assets                          63,468       76,286

Property and equipment, net                                  4,757        4,601
Other assets                                                 2,780        3,938
                                                         =========    =========
                                                         $  71,005    $  84,825
                                                         =========    =========

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
        Accounts payable                                 $   2,578    $   1,991
        Accrued liabilities                                 12,704       10,267
        Deferred contract revenue                              625          625
        Capital lease obligations - current portion          2,398        2,277
                                                         ---------    ---------
              Total current liabilities                     18,305       15,160

Long-term liabilities:
        Capital lease obligations - non-current portion      3,934        3,152
        Senior custom convertible notes                      9,273       17,500
                                                         ---------    ---------
              Total long-term liabilities                   13,207       20,652

Stockholders' equity:

        Common stock                                       152,340      141,579
        Deferred compensation                                 (952)        (695)
        Note receivable from stockholder                      (883)        (883)
        Accumulated deficit                               (111,012)     (90,988)
                                                         ---------    ---------
              Total stockholders' equity                    39,493       49,013
                                                         ---------    ---------
                                                         $  71,005    $  84,825
                                                         =========    =========


(1) Derived from audited financial statements at this date.



                             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,
                                                                           ------------------------        -------------------------
                                                                             1998            1997            1998            1997
                                                                           --------        --------        --------        --------
<S>                                                                        <C>             <C>             <C>             <C>     
Contract revenue (includes amounts from
   related party)                                                          $  2,351        $  1,484        $  3,996        $  2,971

Costs and expenses:
   Research and development                                                  11,711           8,570          21,143          16,576
   General and administrative                                                 1,999           1,512           3,844           2,990
                                                                           --------        --------        --------        --------
      Total costs and expenses                                               13,710          10,082          24,987          19,566
                                                                           --------        --------        --------        --------

Operating loss                                                              (11,359)         (8,598)        (20,991)        (16,595)

Other income and expenses:
   Interest income                                                              883             610           1,862           1,303
   Interest expense                                                            (399)           (174)           (867)           (344)
                                                                           --------        --------        --------        --------
      Other income, net                                                         484             436             995             959
                                                                           ========        ========        ========        ========
Net loss                                                                   $(10,875)       $ (8,162)       $(19,996)       $(15,636)
                                                                           ========        ========        ========        ========


Basic and diluted net loss per share                                       $  (0.69)       $  (0.62)       $  (1.28)       $  (1.20)
                                                                           ========        ========        ========        ========

Shares used in computing basic and diluted net loss
  per share                                                                  15,721          13,079          15,533          13,050
                                                                           ========        ========        ========        ========

<FN>

                                                      See accompanying notes.

</FN>
</TABLE>
                                                                 4

<PAGE>

<TABLE>

                                                             SUGEN, Inc.

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

<CAPTION>
                                                                                                            Six Months Ended
                                                                                                                June 30,
                                                                                                      ------------------------------
                                                                                                        1998                 1997
                                                                                                      --------             --------
<S>                                                                                                   <C>                  <C>      
Cash flows from operating activities
Net loss                                                                                              $(19,996)            $(15,636)
Adjustments to reconcile net loss to net cash provided (used) by
operating activities:
      Depreciation and amortization                                                                      1,919                1,500
      Changes in operating assets and liabilities:
        Prepaid expenses and other current assets                                                            9                 (136)
        Other assets                                                                                       (47)                (206)
        Accounts payable                                                                                   587                1,706
        Accrued liabilities                                                                              2,482                 (617)
                                                                                                      --------             --------
Net cash used in operating activities                                                                  (15,046)             (13,389)
                                                                                                      --------             --------

Cash flows from investing activities
Sales/maturities (purchases) of short-term investments, net                                              4,757               (3,179)
Purchases of property and equipment, net                                                                (1,730)              (1,255)
                                                                                                      --------             --------
Net cash provided by (used in) investing activities                                                      3,027               (4,434)
                                                                                                      --------             --------

Cash flows from financing activities
Proceeds from issuance of common stock, net                                                              3,092                  580
Proceeds from lease financing of property and equipment                                                  2,102                1,534
Payments under capital lease obligations                                                                (1,199)                (958)
                                                                                                      --------             --------
Net cash provided by financing activities                                                                3,995                1,156
                                                                                                      --------             --------

Net decrease in cash and cash equivalents                                                               (8,024)             (16,667)
Cash and cash equivalents at beginning of period                                                        23,816               24,852
                                                                                                      --------             --------
Cash and cash equivalents at end of period                                                            $ 15,792             $  8,185
                                                                                                      ========             ========



<FN>

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

                                                                  5
<PAGE>



                                   SUGEN, Inc.

                          NOTES TO FINANCIAL STATEMENTS

                                   (Unaudited)


1.       Summary of Significant Accounting Policies

         Basis of Presentation

         The financial information at June 30, 1998 and for the six months ended
         June 30,  1998 and  1997 is  unaudited  but  includes  all  adjustments
         (consisting only of normal  recurring  adjustments)  which SUGEN,  Inc.
         (the "Company")  considers  necessary for the 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, 1997 included in the
         Company's Form 10-K filed with the Securities and Exchange  Commission.
         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.

         First Quarter Adoption of Statement 130, Reporting Comprehensive Income

         In June 1997, the Financial Accounting Standards Board issued Statement
         of Financial  Accounting  Standards  No. 130,  Reporting  Comprehensive
         Income ("SFAS 130").  SFAS 130  establishes new rules for the reporting
         and  display  of  comprehensive  income  and its  components.  SFAS 130
         requires unrealized gains or losses on the Company's available-for-sale
         securities and foreign currency translation adjustment,  which prior to
         adoption  were  reported  separately  in  shareholders'  equity,  to be
         included in other comprehensive  income. The adoption by the Company of
         SFAS 130 on January 1, 1998 had no material impact on the Company's net
         income or stockholders' equity through June 30, 1998.

2.       Accrued Liabilities

         The components of accrued liabilities consist of the following:

                                                         June 30,   December 31,
                                                           1998           1997
                                                         -------         -------
                                                              (In thousands)
                                                                    
            Accrued research & development services      $ 7,128         $ 5,351
            Accrued compensation                           1,409           1,176
            Accrued professional fees                        967             859
            Other                                          3,200           2,881
                                                         -------         -------
                                                         $12,704         $10,267
                                                         =======         =======
                                                                           
                                                                     
                                       6

<PAGE>




                                   SUGEN, Inc.

                    NOTES TO FINANCIAL STATEMENTS (continued)

                                   (Unaudited)


3.       Research and Development Collaboration Agreements - ProChon Biotech
         Limited

         In June 1998,  the Company  entered into a  collaboration  with ProChon
         Biotech  Limited  ("ProChon")  to discover and develop  small  molecule
         signal transduction  inhibitors for the treatment of achondroplasia and
         other growth  disorders.  In connection  with this  collaboration,  the
         Company received $3.0 million  comprised of a $750,000 initial research
         payment and $2.25  million for the  purchase of 93,750  shares of SUGEN
         Common Stock at $24.00 per share. In addition, the Company will receive
         payments upon  achievement  of certain  milestones  and royalties  with
         respect to worldwide sales of collaboration products.

4.       Senior Custom Convertible Notes

         Through June 30, 1998, $8.2 million of principal and accrued and unpaid
         interest   relating  to  the   Company's   outstanding   senior  custom
         convertible  notes were  converted  into 657,660 shares of SUGEN Common
         Stock at a weighted average price of $12.61 per share.

5.       Subsequent Events

         Allergan, Inc.

         In July 1998,  the first  milestone in  connection  with the  Company's
         collaboration  with  Allergan,  Inc. was  achieved in the  angiogenesis
         program for the treatment of ophthalmic diseases. The $500,000 Allergan
         milestone,  before any royalties, will be reflected in contract revenue
         for the quarter ended September 30, 1998.

         Taiho Pharmaceutical Ltd.

         In July  1998,  the  Company  entered  into  an  agreement  with  Taiho
         Pharmaceutical Ltd. ("Taiho") for the development and commercialization
         of  the  Company's  angiogenesis  inhibitors  for  the  prevention  and
         treatment of cancer.  In  connection  with this  agreement,  Taiho will
         receive  marketing  rights in  Japan,  while the  Company  will  retain
         marketing  rights  for the rest of the  world.  The  Company  will also
         receive an initial research payment,  research and development funding,
         and additional payments upon the achievement of certain milestones. The
         Company has retained the rights to manufacture  and supply  products to
         Taiho for sale in Japan.



                                        7

<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 words such as "intends," "believes," "anticipates," "plans,"
"expects" and similar expressions which are intended to identify forward-looking
statements  within the meaning of Section 27A of the  Securities Act of 1933, as
amended,  and Section 21E of the  Securities  Exchange Act of 1934,  as amended,
which are subject to the "safe harbor" created by those sections.  The Company's
actual  results  could  differ  materially  from the results  discussed in these
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, 1997.  Readers are
cautioned not to place undue reliance on these forward-looking statements, which
speak only as of the date  hereof.  The  Company  undertakes  no  obligation  to
release the results of any revision to these  forward-looking  statements  which
may be made to reflect events or  circumstances  occurring after the date hereof
or to reflect the occurrence of unanticipated events.

Overview

         SUGEN,  Inc.  ("SUGEN"  or the  "Company")  was founded in July 1991 to
discover and develop new classes of small molecule  drugs which target  specific
cellular signal transduction pathways. These signalling pathways are involved in
a variety of  chronic  and acute  pathological  diseases,  including  cancer and
diabetes  as  well  as  in  dermatologic,   ophthalmic,  neurologic  and  immune
disorders.  The Company's  most advanced  product  candidate is SU101, a PDGF TK
signalling antagonist.  The Company initiated a Phase III clinical trial for use
of SU101 as a treatment for refractory malignant glioma during the first quarter
of 1998. Additionally, SUGEN currently has underway a Phase II study of SU101 in
combination  with BCNU in  front-line  glioma  and two Phase II studies of SU101
mono-therapy  in  ovarian  and  hormone  refractory  prostate  cancer.  To date,
approximately 248 patients, including patients with brain, ovarian, prostate and
non-small   cell  lung   cancers,   have  been   treated   with  SU101  in  nine
Company-sponsored   clinical   trials.   The  Company's  second  cancer  product
candidate, SU5416, is a Flk-1/KDR TK antagonist which inhibits angiogenesis (the
process by which blood vessels are formed).  Currently the Company is conducting
initial  Phase I clinical  trials for SU5416 in Europe and the U.S.  and a Phase
I/II study of SU5416 in Kaposi's Sarcoma. In addition, the Company is conducting
a Phase I clinical  trial for SU5271,  an EGF  antagonist,  for the treatment of
psoriasis.  Through June 30, 1998,  substantially  all of the Company's  revenue
apart from  interest  income has been  earned  pursuant to  collaborations  with
Zeneca Limited ("Zeneca"),  ASTA Medica  Aktiengesellschaft  ("ASTA Medica") and
Vision Pharmaceuticals L.P., an affiliate of Allergan,  Inc., and Allergan, Inc.
(collectively  "Allergan").  The  Company  intends  to pursue  its  cancer  drug
discovery  programs  independently  in North  America and its  programs in other
disease areas in collaboration with established pharmaceutical companies.

         In July  1998,  the  Company  entered  into  an  agreement  with  Taiho
Pharmaceutical Ltd. ("Taiho") for the development and  commercialization  of the
Company's angiogenesis inhibitors for the prevention and treatment of cancer. In
accordance  with the agreement,  Taiho will receive  marketing  rights in Japan,
while the Company  will retain  marketing  rights for the rest of the world.  In
addition,  the Company will receive an initial  research  payment,  research and
development  funding,  and additional  payments upon the  achievement of certain
milestones.  The  Company  has  retained  the rights to  manufacture  and supply
products to Taiho for sale in Japan.








                                        8


<PAGE>



         The  Company has not been  profitable  since  inception  and expects to
incur  substantial  losses  for the  foreseeable  future,  primarily  due to the
expansion of  preclinical  and clinical  development  activities  as more of its
proprietary  cancer-related  programs  progress  into the  clinic.  The  Company
expects  that  losses  will  fluctuate  from  quarter to  quarter  and that such
fluctuations may be substantial.  As of June 30, 1998, the Company's accumulated
deficit was $111.0 million.

Results of Operations

     The  Company's  revenues  for the three and six months  ended June 30, 1998
were $2.4  million and $4.0  million,  respectively.  These  results  compare to
revenues  of $1.5  million  and $3.0  million  for the same  periods  last year.
Revenues  for the three and six months  ended June 30,  1998  included  contract
revenue from the Allergan and Zeneca collaborations, milestone and some contract
services revenue (services rendered by ASTA Medica pursuant to the collaboration
but on  non-collaboration  programs) earned under the ASTA Medica  collaboration
and recognition of the initial  research  payment  received in connection with a
collaboration  with  ProChon  Biotech  Limited  ("ProChon").  In  1997,  revenue
included  contract  revenue  from the  Allergan  and Zeneca  collaborations  and
contract  services  revenue  earned  under  the ASTA  Medica  collaboration  for
non-collaboration  programs.  The Company expects to fully utilize the remaining
available  credit for  contract  services  provided by ASTA Medica by the end of
1998,  and  thereafter  will  only  recognize  revenue  under  the  ASTA  Medica
collaboration upon the achievement of specified milestones.

     Research and  development  expenses  increased  to $11.7  million and $21.1
million for the three and six months  ended June 30,  1998,  respectively,  from
$8.6  million and $16.6  million for the same  periods  last year.  The increase
during 1998 was primarily due to higher personnel  related costs associated with
the expansion of clinical  development  activities,  including expanded Phase II
studies  and  initiating  a Phase III study of the  Company's  lead  anti-cancer
compound,  SU101.  The  initiation  of Phase I and  Phase  I/II  studies  of the
Company's second cancer product  candidate,  SU5416,  also contributed to higher
expenses  during 1998.  The Company  expects  that its research and  development
expenses will continue to grow in future periods due to the hiring of personnel,
additional  preclinical studies, the progression of SU101, SU5416 and additional
drug  candidates in clinical  trials,  and research and  development  activities
pursuant to the Company's commitments under anticipated future collaborations.

         General and administrative  expenses for the three and six months ended
June 30, 1998 were $2.0 million and $3.8  million,  respectively.  These results
compare to expenses of $1.5  million and $3.0  million for the same periods last
year. The increase in 1998 was primarily due to higher  headcount  related costs
as  well  as  additional  expenses  in  the  areas  of  corporate  and  business
development.  The Company expects that its general and  administrative  expenses
will continue to increase in order to support the Company's  expanding  research
and development efforts.

         Interest  income for the three and six months  ended June 30,  1998 was
$883,000 and $1.9 million,  respectively,  compared to $610,000 and $1.3 million
earned for the same periods last year.  The increase  from prior year was due to
higher  investment  balances  arising  primarily from issuances of the Company's
capital  stock and senior custom  convertible  notes.  Interest  expense for the
three  and  six  months  ended  June  30,  1998  was   $399,000  and   $867,000,
respectively,  compared to $174,000 and $344,000 for the same periods last year.
This increase was primarily due to the Company's  continued use of capital lease
financing for equipment and property  improvements  and expenses  related to the
issuance of senior custom convertible notes.





                                        9


<PAGE>



Liquidity and Capital Resources

          At  June  30,  1998,  the  Company  had  cash,  cash  equivalents  and
short-term   investments   of   approximately   $62.5   million   compared  with
approximately  $75.3  million at December  31,  1997.  The  decrease in cash and
investments  during the six  months  ended June 30,  1998 was  primarily  due to
operating  losses  partially  offset by the  issuance of SUGEN  Common  Stock in
connection with the ProChon collaboration.

         Through June 1998,  the Company's  principal  sources of financing have
been its initial and follow-on public  offerings of Common Stock,  placements of
the Company's  Preferred and Common Stock and senior custom  convertible  notes,
and funds received under the Company's corporate  collaborations.  The Company's
current  principal  sources  of  liquidity  are  its  research  and  development
collaborations  with Zeneca,  Taiho,  Allergan and ASTA Medica,  its cash,  cash
equivalents and short-term investments and capital lease financing.  At June 30,
1998, the Company had combined capital lease lines of $4.3 million available for
the purchase of equipment and facility improvements.

         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 external
research funding are approximately $1.7 million,  $1.6 million, $1.4 million and
$1.1  million  in  1998,  1999,  2000  and  2001,  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.  The Company anticipates renewing certain contracts that
expired  in 1997  which  will  increase  future  commitments  beyond  the levels
indicated above for 1998 through 2001.

         From time to time,  the  Company  evaluates  potential  investments  in
complementary  businesses,  products or technologies.  Currently, the Company is
considering modest investments in such complementary businesses during 1998. The
Company  has no other  present  undertakings,  commitments  or  agreements  with
respect to investments in other businesses.

         Net  additions  of equipment  and  leasehold  improvements  for the six
months  ended June 30, 1998 were $1.7  million  compared to $1.3  million  spent
during the same period  last year.  Capital  additions  during the first half of
1998 primarily  related to costs  associated  with the  build-to-suit  facility.
Capital additions during the first quarter of 1997 primarily  included the costs
associated with the initial phases of a limited facility expansion and continued
investment  in enhancing  the  Company's  laboratory  capabilities.  The Company
expects that its capital additions for 1998 will continue to be higher than that
of  the  prior  year  primarily  due to  anticipated  facility  improvements  in
connection  with the  build-to-suit  facility lease  agreement which was entered
into in June 1997.  Construction  of the new facility is targeted for completion
during the fourth  quarter of 1998,  which  coincides with the expiration of the
Company's  current  facility  leases.  As building  completion  approaches,  the
Company will continue to invest in facility  improvements and incur move related
costs during the course of the year. The Company  anticipates that substantially
all facility  improvement  costs  associated with the build-out and equipping of
the new  facility  will be  financed  through  a tenant  improvements  allowance
negotiated  with the  landlord  as part of the long  term  lease  agreement  and
through  additional  financial  facilities  arranged with third  parties.  It is
expected that the Company's capital lease obligations, related interest expense,
and facility related expenses, will increase in future periods.



                                       10


<PAGE>



         The Company estimates that its existing capital resources together with
facility and equipment financing,  expected revenues from current collaborations
and net  income  from  investment  activities,  will be  sufficient  to fund its
planned  operations  into  2000.  However,  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 Year 2000 Issue is the result of computer  programs  being  written
using two digits  rather than four digits to define the  applicable  year.  This
could  result in a system  failure or  miscalculations  causing  disruptions  of
operations,  including,  among other  things,  a temporary  inability to process
transactions,  or engage in similar normal business activities.  The Company has
reviewed its existing  software  programs to identify and address  programs that
may  require  upgrading  or  reprogramming  to  address  the Year 2000 Issue and
believes its internal  applications  systems are  currently in  compliance.  The
Company is in the process of initiating  formal  communications  with all of its
significant suppliers to determine the extent to which the Company is vulnerable
to those third  parties'  failure to remediate  their own Year 2000 Issues.  The
project  is  estimated  to be  completed  early  1999,  which  is  prior  to any
anticipated  impact on its operations.  The Company does not expect the costs of
Year  2000  compliance  to have a  material  impact on the  Company's  financial
results.  However,  there can be no assurance that all third parties,  with whom
the Company works to achieve Year 2000  compliance on a timely basis for systems
related to their interactions with the Company,  or that failure to achieve Year
2000 by such entities will not 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 three
drug candidates  (SU101,  SU5271 and SU5416) have entered  clinical  trials.  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 several more years, even if they are developed successfully and proven to be
safe and effective.  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.  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.  Some of
the  Company's  currently  proposed  products  are  subject to  development  and
licensing arrangements with the Company's collaborators.  Therefore, the Company
is  in  part  dependent  on  the  research  and  development  efforts  of  these
collaborators  with respect to those  products and is entitled only to a portion
of the revenues,  if any,  realized from the  commercial  sale of those products
covered by the collaborations in many jurisdictions. Before obtaining regulatory
clearance for the commercial sale of any of its products under development, the

                                       11


<PAGE>


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.  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 are a range of additional risks, including
uncertainties regarding protection of patents and proprietary rights, government
regulation,  competition,  employee  issues,  manufacturing  uncertainties,  the
Company's  lack of sales  and  marketing  capabilities,  uncertainty  of  market
acceptance of the Company's products, and uncertainties regarding pharmaceutical
pricing and reimbursement.














































                                       12


<PAGE>


                           PART II. OTHER INFORMATION


Item 2.  CHANGES IN SECURITIES AND USE OF PROCEEDS

         In connection with the ProChon collaboration,  the Company entered into
         a Common Stock Purchase Agreement,  dated as of June 30, 1998, pursuant
         to which an  affiliate  of  ProChon  purchased  93,750  shares of SUGEN
         Common  Stock at $24.00 per share for an  aggregate  purchase  price of
         $2.25 million in a private  placement  exempt from  registration  under
         Rule 505 of  Regulation  D and Section  4(2) of the  Securities  Act of
         1933, as amended.

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

         On  May  20,  1998,  the  Company  held  its  1998  Annual  Meeting  of
         Stockholders. The following actions were taken at the meeting:

(a)      The  following two  directors  were each elected for a three-year  term
         expiring at the 2001 Annual Meeting of Stockholders:

              1.  12,599,210  shares voted in favor of Stephen  Evans-Freke  and
                  370,170 shares withheld their vote;

              2.  12,599,555  shares voted in favor of Axel Ullrich,  Ph.D.  and
                  369,825 shares withheld their vote;

         The following individuals' terms of office as directors continued after
the meeting:

              Jeremy L. Curnock Cook
              Charles M. Hartman
              Heinrich Kuhn
              Donald E. Nickelson
              Bruce R. Ross
              Richard D. Sprizzirri

(b)     1.   A proposal to approve an  amendment  to the  Company's  1992 Stock
              Option  Plan,  as amended,  to increase  the  aggregate  number of
              shares of Common Stock  available for issuance by 750,000  shares:
              7,379,863  shares were voted in favor of the  proposal,  1,316,455
              shares were voted against the proposal,  414,627 shares  abstained
              and 3,858,435 shares were broker non-votes.

         2.   A  proposal  to  approve  an  amendment  to  the  Company's   1994
              Non-Employee Directors' Stock Option Plan, as amended, to increase
              the  aggregate  number of shares of  Common  Stock  available  for
              issuance by 150,000 shares:  8,749,959  shares were voted in favor
              of the proposal,  138,583  shares were voted against the proposal,
              222,403  shares   abstained  and  3,858,435   shares  were  broker
              non-votes.

         3.   The  ratification  of the  selection  of Ernst & Young  LLP as the
              Company's  independent  auditors:  12,742,349 shares were voted in
              favor of the  proposal,  13,975  shares  were  voted  against  the
              proposal,  213,056  shares  abstained  and zero shares were broker
              non-votes.





                                       13

<PAGE>





Item 5.       OTHER INFORMATION

              Michael A. Wall  resigned  from the  Company's  Board of Directors
              effective  June  2,  1998 in  order  to cut  back on his  business
              commitments during his retirement.

              Pursuant to the Company's  bylaws,  stockholders who wish to bring
              matters or propose  nominees  for director at the  Company's  1999
              annual meeting of stockholders must provide specified  information
              to the  Company  between  February  18,  1999 and March  20,  1999
              (unless such matters are included in the Company's proxy statement
              pursuant to Rule 14a-8 under the Securities  Exchange Act of 1934,
              as amended).

Item 6.       EXHIBITS AND REPORTS ON FORM 8-K

(a)           Exhibits

Exhibit Number                      Description

            3.1          Restated Certificate of Incorporation (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)
           10.72         Common Stock Purchase Agreement, dated June 30, 1998, 
                           between the Registrant and Oceana Investment 
                           Corporation PLC.
           10.73+        Heads of  Agreement,  dated June 30, 1998,  between the
                           Registrant and ProChon Biotech Limited.
           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, 1998.




                                       14

<PAGE>


<TABLE>
<CAPTION>

                                   SIGNATURES

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

<S>                                                      <C>
Date:    August 12, 1998                                  SUGEN, Inc.
         -------------------------------




By:    /s/ Stephen Evans-Freke                            By:   /s/ Susan M. Kanaya
       ---------------------------------                        ----------------------------
       Stephen Evans-Freke                                      Susan M. Kanaya
       Chairman of the Board and                                Treasurer
       Principal Executive and Financial                        Principal Accounting Officer
       Officer


</TABLE>
















                                       15

<PAGE>



                                   SUGEN, Inc.

                                  EXHIBIT INDEX


Exhibit Number                      Description
- --------------                      -----------

         3.1             Restated Certificate of Incorporation (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)
         10.72           Common Stock Purchase Agreement, dated June 30, 1998, 
                           between the Registrant and Oceana Investment
                           Corporation PLC.
         10.73+          Heads  of  Agreement, dated  June  30,  1998,   between
                           the Registrant and ProChon Biotech Limited.
         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.


                                       16



                         COMMON STOCK PURCHASE AGREEMENT

                            Dated As Of June 30, 1998

                       for the purchase of Common Stock of

                                   SUGEN, INC.

                                       by

                        OCEANA INVESTMENT CORPORATION PLC



<PAGE>
<TABLE>
                                                   TABLE OF CONTENTS

                                                                                                               PAGE
<CAPTION>


<S>                                                                                                              <C>
1.       PURCHASE AND SALE OF COMMON STOCK........................................................................1

2.       CLOSING; DELIVERY........................................................................................1

         2.1      Closing.........................................................................................1

         2.2      Payment and Delivery............................................................................2

3.       REPRESENTATIONS, WARRANTIES AND COVENANTS OF THE COMPANY.................................................2

         3.1      Organization....................................................................................3

         3.2      Capitalization..................................................................................3

         3.3      Authority.......................................................................................3

         3.4      Financial Statements............................................................................3

         3.5      Issuance of the Shares..........................................................................4

         3.6      No Conflict with Law or Documents...............................................................4

         3.7      Absence of Certain Developments.................................................................4

         3.8      Litigation......................................................................................4

         3.9      Registration Rights Covenant....................................................................4

         3.10     Covenant to Keep Public Information Available...................................................9

         3.11     SEC Reports....................................................................................10

         3.12     Securities Law Compliance......................................................................10

         3.13     Registration Rights............................................................................10

4.       REPRESENTATIONS, WARRANTIES AND COVENANTS OF PURCHASER..................................................10

         4.1      Legal Power....................................................................................10

         4.2      Due Execution..................................................................................10

         4.3      Investment Representations and Covenants.......................................................10

5.       MISCELLANEOUS...........................................................................................11

         5.1      Governing Law..................................................................................11

         5.2      Successors and Assigns.........................................................................11

         5.3      Entire Agreement...............................................................................12

         5.4      Separability...................................................................................12

         5.5      Amendment and Waiver...........................................................................12

         5.6      Notices........................................................................................12

         5.7      Fees and Expenses..............................................................................13


                                                                 i.

<PAGE>

                                                   TABLE OF CONTENTS
                                                       (CONTINUED)

         5.8      Titles and Subtitles...........................................................................13

         5.9      Counterparts...................................................................................13



</TABLE>

                                                                ii.

<PAGE>


An extra  section break has been inserted  above this  paragraph.  Do not delete
this   section   break   if  you   plan  to  add  text   after   the   Table  of
Contents/Authorities.    Deleting    this   break    will    cause    Table   of
Contents/Authorities  headers and footers to appear on any pages  following  the
Table of Contents/Authorities.


<PAGE>


                         COMMON STOCK PURCHASE AGREEMENT


         THIS COMMON STOCK  PURCHASE  AGREEMENT  (the  "Agreement) is made as of
June 30, 1998 (the  "Effective  Date") by and between  SUGEN,  INC.,  a Delaware
corporation  (the  "Company"),   and  OCEANA   INVESTMENT   CORPORATION  PLC,  a
corporation  organized under the laws of England and Wales (itself or one of its
wholly owned subsidiaries  designated by it,  "Purchaser").  In consideration of
the mutual  promises,  representations,  warranties  and conditions set forth in
this Agreement, the Company and Purchaser agree as follows:

         1. PURCHASE AND SALE OF COMMON STOCK.  The Company has  authorized  the
issuance  and sale to Purchaser  of 93,750  shares (the  "Shares") of its common
stock,  $.01 par value  (the  "Common  Stock").  In  reliance  upon  Purchaser's
representations and warranties  contained in Section 4 hereof and subject to the
terms and conditions  set forth herein,  the Company agrees to sell to Purchaser
the  Shares,  to be issued  and sold at a price per share  equal to  $24.00.  In
reliance upon the  representations  and  warranties of the Company  contained in
Section 3 hereof  and  subject  to the terms and  conditions  set forth  herein,
Purchaser  hereby agrees to purchase the Shares at the per share  purchase price
set forth above.

         2.       CLOSING; DELIVERY.

                    The closing of the sale and  purchase  of Shares  under this
Agreement (the "Closing")  shall take place at 10:00 a.m.,  California  time, on
the date of satisfaction of the conditions set forth below (the "Closing Date"),
at the offices of Cooley  Godward  LLP,  Five Palo Alto  Square,  3000 El Camino
Real, Palo Alto, California,  or at such other time and place as the Company and
Purchaser  may agree.  At the  Closing,  the  Company  will issue and sell,  and
Purchaser  will  purchase,  the  Shares  for  an  aggregate  purchase  price  of
$2,250,000.

              2.1 Closing. (a) The  obligations  of  Purchaser  to purchase  the
Shares at the Closing are  subject to the  fulfillment  on or before the Closing
Date of each of the following  conditions,  which may be waived only in writing,
on or before June 30, 1998:

                                    (i) The  representations  and  warranties of
the Company  contained  in Section 3 shall be true and  correct in all  material
respects on and as of the Closing Date with the same force and effect as if such
representations and warranties had been made on and as of the Closing Date.

                                    (ii) The Company  shall have  performed  and
complied  with all  agreements,  obligations  and  conditions  contained in this
Agreement  that are required to be performed or complied with by it on or before
the Closing Date.

                                    (iii)  All  authorizations,   approvals,  or
permits, if any, of any governmental  authority or regulatory body of the United
States or of any state that are required in connection  with the lawful sale and
issuance of the Shares at the Closing pursuant to this Agreement shall have been
obtained and shall be effective on and as of the Closing  Date. No 

                                       1.
<PAGE>


stop  order or other  order  enjoining  the sale of the  Shares  shall have been
issued and no proceedings for such purpose shall be pending or, to the knowledge
of the Company,  threatened by the SEC, or any  commissioner  of corporations or
similar officer of any state having  jurisdiction over this transaction.  At the
time of the  Closing,  the sale and  issuance  of the  Shares  shall be  legally
permitted by all laws and  regulations  to which  Purchaser  and the Company are
subject.

                                    (iv)  The  Company   and   ProChon   Biotech
Limited, an Israeli corporation  ("ProChon"),  shall have executed and delivered
to each other the Heads of  Agreement  by and  between  the  Company and ProChon
dated as of the Closing Date (the "Heads of Agreement").

                           (b) The  obligations  of the  Company  are subject to
fulfillment  on or before the Closing Date of each of the following  conditions,
which may be waived only in writing, on or before June 30, 1998:

                                    (i) The  representations  and  warranties of
the  Purchaser  contained in Section 4 shall be true and correct in all material
respects on and as of the Closing Date with the same force and effect as if such
representations and warranties had been made on and as of the Closing Date.

                                    (ii) The Purchaser  shall have performed and
complied  with all  agreements,  obligations  and  conditions  contained in this
Agreement  that are required to be performed or complied with by it on or before
the Closing Date.

                                    (iii)  All  authorizations,   approvals,  or
permits, if any, of any governmental  authority or regulatory body of the United
States or of any state that are required in connection  with the lawful sale and
issuance of the Shares at the Closing pursuant to this Agreement shall have been
obtained and shall be effective on and as of the Closing  Date. No stop order or
other  order  enjoining  the sale of the Shares  shall  have been  issued and no
proceedings  for such  purpose  shall be  pending  or, to the  knowledge  of the
Company,  threatened by the SEC, or any  commissioner of corporations or similar
officer of any state having  jurisdiction over this transaction.  At the time of
the Closing,  the sale and issuance of the Shares shall be legally  permitted by
all laws and regulations to which Purchaser and the Company are subject.

                                    (iv) The  Company  and  ProChon  shall  have
executed  and  delivered  to each other the Heads of  Agreement  dated as of the
Closing Date.

                  2.2 Payment and Delivery. At the Closing, subject to the terms
and  conditions   hereof,   the  Company  will  deliver  to  Purchaser  a  stock
certificate,  registered in the name of Purchaser, representing the Shares to be
purchased  by  Purchaser  from the  Company,  dated as of the  Closing,  against
payment of the purchase price  therefor by wire transfer,  unless other means of
payment shall have been agreed upon by Purchaser and the Company.

                                       2.
<PAGE>


         3.       REPRESENTATIONS, WARRANTIES AND COVENANTS OF THE COMPANY.

         Subject  to and except as  disclosed  by the  Company in the  Company's
Annual  Report on Form 10-K for the fiscal  year ended  December  31,  1997 (the
"Form 10-K"), quarterly report on Form 10-Q for the quarter ended March 31, 1998
(the  "Form  10-Q")  and  Proxy   Statement  for  the  1998  Annual  Meeting  of
Stockholders,  dated  as  of  April  17,  1998  (the  "Proxy  Statement"),  each
previously  delivered to Purchaser,  or in the Schedule of  Exceptions  attached
hereto  as  Exhibit  A  (the  "Schedule  of  Exceptions"),  the  Company  hereby
represents  and warrants to Purchaser as follows as of the date hereof and as of
the Closing Date, and all such  representations and warranties shall survive the
Closing:

                  3.1   Organization.   The  Company  is  a  corporation,   duly
incorporated,  validly  existing  and in good  standing  under  the  laws of the
jurisdiction  of its  incorporation.  The  Company has all  requisite  power and
authority  to own or lease its  properties  and to conduct  its  business as now
conducted.  The Company holds all licenses and permits  required for the conduct
of its business as now conducted,  which, if not obtained, would have a material
adverse effect on the business,  financial condition or results of operations of
the Company taken as a whole. The Company is qualified as a foreign  corporation
and is in good  standing in all states  where the conduct of its business or its
ownership or leasing of property requires such  qualification,  except where the
failure to so qualify would not have a material  adverse effect on the business,
financial condition or results of operations of the Company taken as a whole.

                  3.2  Capitalization.  The  authorized,  issued and outstanding
capital stock of the Company and a description of the Company's stock option and
stock purchase plans is as set forth in the Proxy  Statement.  All of the issued
and outstanding shares of common stock have been duly authorized, validly issued
and are fully  paid and  nonassessable.  Except  for  rights  granted  under the
Company's  1992 Stock Option Plan,  1994  Non-Employee  Directors'  Stock Option
Plan, Employee Stock Purchase Plan,  Long-Term  Objectives Stock Option Plan for
Senior  Management and Preferred  Share Purchase Rights Plan and the outstanding
warrants  and 8% Senior  Custom  Convertible  Notes  described  in the Form 10-K
(certain of which have been  exercised  or  converted  as  described in Schedule
3.2),  there  are  no  existing   subscriptions,   options,   warrants,   calls,
commitments, agreements, conversion or other rights of any character (contingent
or otherwise) to purchase or otherwise acquire from the Company, at any time, or
upon the happening of any stated  event,  any shares of the capital stock of the
Company.  On June 29, 1998,  16,058,126 shares of Common Stock were outstanding,
and no other shares of capital stock of the Company were outstanding.

                  3.3  Authority.  The  Company  has  all  requisite  power  and
authority  to enter into this  Agreement,  and to  consummate  the  transactions
contemplated  hereby.  The  execution  and  delivery of this  Agreement  and the
consummation of the transactions  contemplated  hereby have been duly authorized
by all necessary corporate action on the part of the Company, and upon execution
and delivery by the Company,  this Agreement will constitute a valid and binding
obligation of the Company,  enforceable  against the Company in accordance  with
its  terms,  subject  to  applicable  bankruptcy,  insolvency,   reorganization,
moratorium and similar laws relating to or affecting creditor's rights from time
to time in effect, and subject to general equity principles.


                                       3.

<PAGE>

                  3.4  Financial  Statements.  The  financial  statements of the
Company included in the Form 10-K and Form 10-Q fairly presented in all material
respects  the  financial  position and results of  operations  of the Company at
their respective  dates and for the respective  periods to which they apply; and
such  financial  statements  have been  prepared in  accordance  with  generally
accepted  accounting  principles  consistently  applied  throughout  the periods
involved except as otherwise stated therein.

                  3.5 Issuance of the Shares.  The Shares,  when issued pursuant
to the terms of this Agreement,  will be duly and validly authorized and issued,
fully paid and nonassessable.

                  3.6 No Conflict with Law or Documents. The execution, delivery
and consummation of this Agreement and the transactions contemplated hereby will
not (a) conflict with any provisions of the Certificate of  Incorporation or the
Bylaws of the  Company;  (b) result in any  violation of or default or loss of a
benefit under, or permit the  acceleration  of any obligation  under or conflict
with (in each case, upon the giving of notice, the passage of time, or both) any
mortgage,  indenture,  lease, agreement or other instrument,  permit,  franchise
license,  judgment, order, decree, law, ordinance, rule or regulation applicable
to the Company or its respective properties.

                  3.7 Absence of Certain Developments. Since March 31, 1998, the
Company  has not (a)  incurred  or become  subject to any  material  liabilities
(absolute or contingent) except current  liabilities  incurred,  and liabilities
under  contracts  entered into, in the ordinary  course of business,  consistent
with past practices; (b) mortgaged,  pledged or subjected to lien, charge or any
other  encumbrance  any material  assets,  tangible or intangible  except in the
ordinary course of business,  consistent with past practices; (c) sold, assigned
or transferred any material assets or canceled any material debts or obligations
except in the ordinary course of business,  consistent with past practices;  (d)
suffered any extraordinary  losses,  or waived any rights of substantial  value;
(e) entered into any material  transaction  other than in the ordinary course of
business, consistent with past practices; or (f) otherwise had any change in its
condition,  financial or otherwise, except for changes in the ordinary course of
business,  consistent with past practices,  none of which individually or in the
aggregate has been materially adverse to the Company.

                  3.8  Litigation.  To the  Company's  knowledge,  there  are no
actions,  suits,  proceedings or investigations pending or threatened against or
affecting the Company that in the aggregate  could  reasonably be anticipated to
result in any material adverse effect on the Company.

                  3.9  Registration Rights Covenant.

                           (a) At any time during the 180-day period immediately
following the earlier of (i) the expiration of the Term of the Collaboration (as
defined in the Heads of  Agreement),  without  giving  effect to any  extensions
thereof  or (ii)  the  earlier  termination  of the  Term  of the  Collaboration
pursuant  to terms  set  forth in the Heads of  Agreement  or the  Collaboration
Agreement   contemplated   by  the  Heads  of  Agreement   (the   "Collaboration
Agreement"),  Purchaser  shall  have the  right to cause the  Company  to file a
registration  statement under the Securities Act for a public offering of all or
part of the Shares, but in no event less than 


                                       4.
<PAGE>

75,000  Shares,  beneficially  owned by Purchaser by delivering  written  notice
thereof to the  Company  specifying  the number of Shares to be included in such
registration and the intended method of distribution  thereof (the "Registration
Request").  Upon receipt of the  Registration  Request,  the Company  shall,  as
expeditiously  as  possible,  use  its  best  efforts  to  promptly  effect  the
registration under the Securities Act, and all applicable state securities laws,
to the extent necessary to permit the sale or other  disposition by Purchaser of
the Shares to be so registered in accordance with such notice.

                           (b) The demand registration rights granted in Section
3.9(a) are subject to the  following  limitations:  (i) the Company shall not be
obligated to effect more than one registration  pursuant to Section 3.9(a), (ii)
the Company shall not be obligated to effect such  registration  for a period of
60  days  following  the  closing  of an  underwritten  public  offering  of the
Company's  equity  securities that is in registration at the time of the receipt
of the Registration Request (provided that the period within which Purchaser may
demand  registration  hereunder  will be extended by the number of days by which
the  registration  requested by Purchaser is delayed pursuant to this sentence);
and (iii) if the Company shall furnish to Purchaser a certificate  signed by the
Chairman of the Board of Directors of the Company stating that in the good faith
judgment  of the  Board of  Directors  of the  Company,  it  would be  seriously
detrimental  to the Company and its  stockholders  for such  registration  to be
effected at such time, then the Company shall have the right to defer the filing
of the  registration for a period of not more than 180 days after receipt of the
Registration Request (provided that the period within which Purchaser may demand
registration  hereunder  will be  extended  by the  number  of days by which the
registration requested by Purchaser is delayed pursuant to this sentence).

                           (c)  If and  when  the  Company  is  required  by the
provisions  of  Section  3.9(a) to include  any of the Shares in a  registration
under the Securities Act,  Purchaser will furnish in writing such information as
is  reasonably  requested  by the  Company  for  inclusion  in the  registration
statement relating to such offering and such other information and documentation
as the Company shall reasonably request,  and the Company will, as expeditiously
as possible:

                                    (i) Prepare and file with the Securities and
Exchange  Commission  ("SEC") a  registration  statement  with  respect  to such
securities  and use its best  efforts to cause such  registration  to become and
remain  effective  for such period as may be necessary to permit the  successful
marketing of such  securities,  but not exceeding 120 days (excluding any period
during which a stop order is in effect).

                                    (ii)  Prepare  and  file  with  the SEC such
amendments  and  supplements to such  registration  statement and the prospectus
used in connection  therewith as may be necessary to comply with the  provisions
of the Securities Act and to keep such registration statement effective for that
period of time specified in paragraph (i) of this section.

                                    (iii)  Furnish to  Purchaser  such number of
prospectuses and preliminary prospectuses in conformity with the requirements of
the  Securities  Act and such other  documents as such  Purchaser may reasonably
request in order to  facilitate  the  public  sale or other  disposition  of the
Shares registered hereunder.

                                       5.
<PAGE>

                                    (iv) Use its best  efforts  to  register  or
qualify  the Shares  covered  by such  registration  statement  under such other
securities or blue sky laws of such  jurisdictions as Purchaser shall reasonably
request  and do any and all other  acts and  things  which may be  necessary  or
desirable to enable Purchaser to consummate the public sale or other disposition
in such  jurisdictions  of the Shares  covered by such  registration  statement,
provided that the Company shall not be required in connection  therewith or as a
condition  thereto  to qualify to do  business  or to file a general  consent to
service of process in any such states or jurisdictions.

                           (d)  In the  event  of a  registration  of any of the
Shares under the Securities Act pursuant to Section 3.9(a) in connection with an
underwritten  public  offering,  the  Company  will enter into and  perform  its
obligations under an underwriting  agreement,  in usual and customary form, with
the  managing  underwriters  of  such  offering,  including  without  limitation
providing usual and customary  indemnification.  In the event Purchaser proposes
to sell Shares in  accordance  with this  Section  pursuant  to an  underwritten
offering,  the Company shall have the right to approve the managing underwriters
for  such  offering;   provided,  however,  that  such  approval  shall  not  be
unreasonably withheld.

                           (e) At any time or from  time to time  following  the
earlier of (i) the  expiration of the Term of the  Collaboration  (as defined in
the Heads of Agreement), without giving effect to any extensions thereof or (ii)
the earlier  termination of the Term of the Collaboration  pursuant to terms set
forth in the Heads of Agreement or the Collaboration  Agreement,  if the Company
shall  determine  to register any of its  securities  under the  Securities  Act
either  for its own  account  or the  account  of a  security  holder or holders
exercising  their  respective   demand   registration   rights,   other  than  a
registration  relating  solely to  employee  benefit  plans,  or a  registration
relating solely to a Rule 145 transaction, or a registration on any registration
form that does not permit secondary sales, then the Company will:

                                    (i)  promptly  give to  Purchaser  a written
notice thereof; and

                                    (ii) use its best efforts to include in such
registration  (and  any  related  qualification  under  blue  sky  laws or other
compliance),   except  as  set  forth  in  Section  3.9(f)  below,  and  in  any
underwriting  involved therein, all of the Shares specified in a written request
or requests  made by Purchaser  and received by the Company  within  twenty (20)
days after the written notice from the Company  described in clause (i) above is
mailed or delivered by the  Company.  Such written  request may specify all or a
part of the Shares.

                           (f) If the  registration  of which the Company  gives
notice  to  Purchaser  is  for  a  registered   public  offering   involving  an
underwriting,  the Company  shall so advise  Purchaser  as a part of the written
notice  given  pursuant  to  Section  3.9(e)(i).  In such  event,  the  right of
Purchaser to registration  pursuant to Section 3.9(e) shall be conditioned  upon
Purchaser's  participation in such  underwriting and the inclusion of all or any
part of the Shares  specified in Purchaser's  notice in the  underwriting to the
extent provided herein. Purchaser shall (together with the Company and the other
holders of securities  of the Company with  registration  rights to  participate
therein  distributing their securities through such underwriting)  enter into an
underwriting  agreement  in  customary  form  with  the  representative  of  the
underwriter or underwriters selected by the Company.


                                       6.
<PAGE>

         Notwithstanding  any other  provision of Sections 3.9(e) or (f), if the
representative of the underwriters advises the Company in writing that marketing
factors  require a limitation  on the number of shares to be  underwritten,  the
representative  may (subject to the  limitations set forth below) exclude all of
the  Shares  from,  or limit  the  number  of  Shares  to be  included  in,  the
registration and  underwriting.  The Company shall so advise Purchaser and other
holders of securities requesting registration, and the number of shares that are
entitled to be included in the registration and underwriting  shall be allocated
first  to the  Company  for  securities  being  sold  for  its own  account  and
thereafter  the  number  of  shares  that are  entitled  to be  included  in the
registration  shall be allocated  among  Purchaser and other holders  requesting
inclusion of shares on a pro rata basis,  subject to any prior  agreements among
the Company and its other  stockholders,  but only to the extent that such other
agreements provide for additional limitations on the number of shares such other
stockholders  or the Company  will be  entitled to include in the  registration,
which  agreements  are in effect as of the  Effective  Date. If Purchaser or any
other person does not agree to the terms of any such underwriting, Purchaser and
any other such person  shall be excluded  therefrom  by written  notice from the
Company or the underwriter. Any Shares or other securities excluded or withdrawn
from such underwriting shall also be withdrawn from such registration.

                           (g) As used  herein,  "Registration  Expenses"  shall
mean all expenses  incurred by the Company in  complying  with this Section 3.9,
including, without limitation, all registration,  qualification and filing fees;
printing  expenses;  fees and  disbursements of counsel for the Company (and the
fees and  disbursements of counsel for the Company in its capacity as counsel to
the Purchaser  hereunder;  if Company counsel does not make itself available for
this purpose,  the Company will pay the reasonable fees and disbursements of one
counsel  for the  Purchaser  as  selected  by  Purchaser)  and of the  Company's
independent accounting firm; blue sky fees and expenses;  underwriting discounts
and commissions and the expense of any special audits incident to or required by
any such  registration  (but excluding the compensation of regular  employees of
the Company which shall be paid in any event by the Company). Purchaser will pay
all Registration  Expenses in connection with a registration pursuant to Section
3.9(a) hereof;  provided,  however,  that in the event  Purchaser  withdraws its
demand for registration after having learned of a material adverse change in the
condition, business, or prospects of the Company from that known to Purchaser at
the time of its demand (in which case Purchaser shall retain its rights pursuant
to Section 3.9(a)), all Registration Expenses shall be borne by the Company. All
Registration  Expenses in connection with any  registration  pursuant to Section
3.9(e)  hereof  shall be  borne  by the  Company;  provided,  however,  that any
incremental  filing fees or other  expenses  incurred  by the Company  solely by
reason of Purchaser's exercise of registration rights pursuant to Section 3.9(e)
shall be borne by the Purchaser.

                           (h) The rights  conferred upon  Purchaser  under this
Section 3.9 may be assigned by  Purchaser  to any  permitted  transferee  of the
Shares,  provided  that  each such  transfer  complies  with  Section  4.5,  and
provided, further, that only Purchaser shall be authorized to give notice to the
Company of any request for registration under Section 3.9(a).

                           (i)  In  the  event  any  Shares  are  included  in a
registration statement under Sections 3.9(a) or (e):

                                       7.
<PAGE>

                                    (i) To the  extent  permitted  by  law,  the
Company will  indemnify and hold  harmless  Purchaser,  the partners,  officers,
directors  and legal counsel of Purchaser,  any  underwriter  (as defined in the
Securities Act) for Purchaser and each person, if any, who controls Purchaser or
such  underwriter  within the meaning of the  Securities  Act or the  Securities
Exchange  Act of 1934,  as amended  (the  "Exchange  Act"),  against any losses,
claims,  damages,  or  liabilities  (joint or  several) to which they may become
subject  under the  Securities  Act, the Exchange Act or other  federal or state
law,  insofar as such  losses,  claims,  damages or  liabilities  (or actions in
respect thereof) arise out of or are based upon any of the following statements,
omissions or violations  (collectively  a "Violation")  by the Company:  (a) any
untrue  statement or alleged  untrue  statement of a material fact  contained in
such  registration  statement,  including  any  preliminary  prospectus or final
prospectus  contained therein or any amendments or supplements  thereto, (b) the
omission or alleged  omission to state  therein a material  fact  required to be
stated therein,  or necessary to make the statements therein not misleading,  or
(c) any violation or alleged violation by the Company of the Securities Act, the
Exchange Act, any state  securities  law or any rule or  regulation  promulgated
under the  Securities  Act,  the  Exchange  Act or any state  securities  law in
connection with the offering  covered by such  registration  statement;  and the
Company  will  reimburse  Purchaser  and  each  partner,  officer  or  director,
underwriter  or controlling  person for any legal or other  expenses  reasonably
incurred by them in connection  with  investigating  or defending any such loss,
claim,  damage,  liability  or  action;  provided  however,  that the  indemnity
agreement contained in this Section 3.9(i)(i) shall not apply to amounts paid in
settlement  of any  such  loss,  claim,  damage,  liability  or  action  if such
settlement is effected  without the consent of the Company,  which consent shall
not be unreasonably  withheld,  nor shall the Company be liable in any such case
for any such loss,  claim,  damage,  liability  or action to the extent  that it
arises out of or is based upon a Violation  which occurs in reliance upon and in
conformity with written  information  furnished  expressly for use in connection
with  such  registration  by  Purchaser  or  such  partner,  officer,  director,
underwriter or controlling person of Purchaser.

                                    (ii)  To  the  extent   permitted   by  law,
Purchaser will  indemnify and hold harmless the Company,  each of its directors,
its officers and legal counsel and each person, if any, who controls the Company
within the meaning of the Securities  Act, any  underwriter and any other person
selling  securities  under  such  registration  statement  or any of such  other
person's partners, directors or officers or any person who controls such person,
against any losses,  claims,  damages or liabilities (joint or several) to which
the Company or any such director,  officer,  controlling person,  underwriter or
other such person, or partner,  director,  officer or controlling person of such
person may become  subject under the  Securities  Act, the Exchange Act or other
federal or state law, insofar as such losses, claims, damages or liabilities (or
actions in respect  thereto)  arise out of or are based upon any  Violation,  in
each case to the extent (and only to the extent) that such  Violation  occurs in
reliance upon and in conformity with written information  furnished by Purchaser
under an instrument duly executed by Purchaser and stated to be specifically for
use in connection with such registration; and Purchaser will reimburse any legal
or other  expenses  reasonably  incurred  by the  Company or any such  director,
officer,  controlling person,  underwriter or other person, or partner, officer,
director  or  controlling  person  of  such  other  person  in  connection  with
investigating or defending any such loss, claim, damage,  liability or action if
it is judicially determined that there was such a Violation;  provided,

                                       8.
<PAGE>

however, that the indemnity agreement contained in this Section 3.9(i)(ii) shall
not  apply to  amounts  paid in  settlement  of any such  loss,  claim,  damage,
liability  or action if such  settlement  is  effected  without  the  consent of
Purchaser,  which consent shall not be unreasonably withheld;  provided further,
that in no event shall any indemnity  under this Section  3.9(i)(ii)  exceed the
net proceeds from the offering received by such Purchaser

                                    (iii)   Promptly   after   receipt   by   an
indemnified party under this Section 3.9(i) of notice of the commencement of any
action  (including any governmental  action),  such indemnified party will, if a
claim in respect thereof is to be made against any indemnifying party under this
Section  3.9(i),  deliver  to the  indemnifying  party a  written  notice of the
commencement  thereof  and the  indemnifying  party  shall  have  the  right  to
participate in, and, to the extent the  indemnifying  party so desires,  jointly
with any other  indemnifying  party  similarly  noticed,  to assume the  defense
thereof with counsel mutually  satisfactory to the parties;  provided,  however,
that an indemnified  party shall have the right to retain its own counsel,  with
the fees and expenses to be paid by the indemnifying party, if representation of
such indemnified  party by the counsel retained by the indemnifying  party would
be inappropriate  due to actual or potential  differing  interests  between such
indemnified  party and any  other  party  represented  by such  counsel  in such
proceeding.  The failure to deliver  written  notice to the  indemnifying  party
within a reasonable time of the  commencement of any such action,  if materially
prejudicial   to  its  ability  to  defend  such  action,   shall  relieve  such
indemnifying  party of any liability to the indemnified party under this Section
3.9(i),  but the omission so to deliver written notice to the indemnifying party
will not relieve it of any liability that it may have to any  indemnified  party
otherwise than under this Section 3.9(i).

                                    (iv) If the indemnification  provided for in
this  Section  3.9(i)  is  held  by a  court  of  competent  jurisdiction  to be
unavailable to an indemnified party with respect to any losses,  claims, damages
or  liabilities   referred  to  herein,  the  indemnifying  party,  in  lieu  of
indemnifying such indemnified party thereunder, shall to the extent permitted by
applicable  law  contribute  to the amount  paid or payable by such  indemnified
party as a result of such loss, claim, damage or liability in such proportion as
is appropriate to reflect the relative  fault of the  indemnifying  party on the
one  hand and of the  indemnified  party on the  other  in  connection  with the
Violation(s) that resulted in such loss, claim, damage or liability,  as well as
any  other  relevant  equitable  considerations.   The  relative  fault  of  the
indemnifying  party and of the indemnified  party shall be determined by a court
of law by reference to, among other things, whether the untrue or alleged untrue
statement of a material fact or the omission to state a material fact relates to
information  supplied by the indemnifying  party or by the indemnified party and
the parties' relative intent,  knowledge,  access to information and opportunity
to correct or prevent such  statement or  omission;  provided,  that in no event
shall any  contribution  by Purchaser  hereunder  exceed the  proceeds  from the
offering received by Purchaser.

                                    (v)  The  obligations  of  the  Company  and
Purchaser under this Section 3.9(i) shall survive  completion of any offering of
securities in a registration  statement pursuant to Section 3.9. No indemnifying
party,  in the defense of any such claim or litigation,  shall,  except with the
consent of each  indemnified  party,  consent to entry of any  judgment or enter
into any settlement which does not include as an unconditional  term thereof the
giving by 

                                       9.

<PAGE>

the  claimant  or  plaintiff  to such  indemnified  party of a release  from all
liability in respect to such claim or litigation.

                           (j) The  right of  Purchaser  to  exercise  any right
provided under Section 3.9 shall terminate at such time as all of the Shares may
immediately  be sold under Rule 144 under the  Securities  Act or any  successor
provision during any 90-day period.

                  3.10  Covenant  to  Keep  Public  Information  Available.  The
Company  covenants and agrees that it will file the reports required to be filed
by it  under  the  Securities  Act  and the  Exchange  Act  and  the  rules  and
regulations  adopted by the SEC  thereunder  as such may be amended from time to
time  (the  "Rules"),  and will take  such  further  actions  as  Purchaser  may
reasonably  request,  all to the  extent  required  from  time to time to enable
Purchaser  to sell  Shares  at such  times as are  permitted  by this  Agreement
without registration under the Securities Act within the limitations of Rule 144
of the Rules or any similar  rule or  regulation  hereafter  adopted by the SEC.
Upon the  request  of  Purchaser,  the  Company  will  supply  Purchaser  with a
certificate certifying compliance with this provision.

                  3.11 SEC  Reports.  All of the  reports  filed by the  Company
under the Exchange Act prior to the date of this  Agreement  (the "SEC Reports")
comply in all material  respects with the requirements of the Exchange Act. None
of the SEC Reports  contains,  as of the respective  dates  thereof,  any untrue
statement of a material  fact or omits to state any material fact required to be
stated  therein or necessary to make the  statements  therein not  misleading in
light of the circumstances under which they were made.

                  3.12 Securities Law  Compliance.  Assuming the accuracy of the
representations  and warranties of Purchaser  contained in Section 4, the offer,
issuance, sale and delivery of the Shares constitute an exempt transaction under
the Securities Act.

                  3.13 Registration Rights.  Except as set forth in the Schedule
of  Exceptions,  the Company is not under any  obligation to register any of its
presently outstanding securities or any of its securities which may hereafter be
issued.

         4.       REPRESENTATIONS, WARRANTIES AND COVENANTS OF PURCHASER.

         Purchaser hereby represents, warrants and covenants with the Company as
follows:

                  4.1 Legal Power.  Purchaser has the requisite  corporate power
and is authorized to enter into this Agreement, to purchase the Shares hereunder
and to carry out and perform its obligations under the terms of this Agreement.

                  4.2 Due  Execution.  This  Agreement has been duly  authorized
executed and delivered by Purchaser,  and upon due execution and delivery by the
Company, this Agreement will be a valid and binding agreement of Purchaser.

                  4.3 Investment  Representations  and  Covenants.  Purchaser is
acquiring  the  Shares  for  its own  account,  not as  nominee  or  agent,  for
investment  and  not  with a view  to or for  resale  in  connection  with,  any
distribution  or public  offering  thereof  within the meaning of

                                      10.
<PAGE>


the  Securities  Act.  Purchaser  understands  that  the  Shares  have  not been
registered  under the Securities  Act, but are instead being offered and sold to
Purchaser pursuant to an exemption from registration contained in the Securities
Act based in part upon the following representations and warranties:

                           (a) Purchaser is capable of evaluating the merits and
risks of its  investment  in the Company and has the capacity to protect its own
interests.  Purchaser must bear the economic risk of this investment  unless the
Shares are  registered  pursuant to the  Securities  Act, or an  exemption  from
registration is available. Purchaser understands that the Company has no present
intention of registering the Shares. Purchaser also understands that there is no
assurance that any exemption from registration  under the Securities Act will be
available  and that,  even if  available,  such  exemption  may not  allow  such
Purchaser to transfer all or any portion of the Shares under the  circumstances,
in the amounts or at the times Purchaser might propose.

                           (b)  Purchaser  is  acquiring  the  Shares  for  such
Purchaser's  own account for investment  only, and not with a view towards their
distribution.

                           (c) Purchaser represents that by reason of its, or of
its management's,  business or financial experience,  Purchaser has the capacity
to protect its own interests in connection with the transactions contemplated in
this Agreement.

                           (d) Purchaser has had an  opportunity  to discuss the
Company's  business,  management and financial affairs with directors,  officers
and  management  of the  Company  and has  had the  opportunity  to  review  the
Company's  operations and facilities.  Purchaser has also had the opportunity to
ask  questions  of and receive  answers  from,  the  Company and its  management
regarding the terms and conditions of this investment.

                           (e) Purchaser acknowledges and agrees that the Shares
must be held  indefinitely  unless they are  subsequently  registered  under the
Securities Act or an exemption from such  registration  is available.  Purchaser
has been advised or is aware of the provisions of Rule 144 promulgated under the
Securities  Act, which permits  limited resale of shares  purchased in a private
placement subject to the satisfaction of certain  conditions,  including,  among
other things:  the availability of certain current public  information about the
Company, the resale occurring not less than one year after a party has purchased
and paid for the  security  to be sold,  the sale being  through an  unsolicited
"broker's  transaction" or in transactions directly with a market maker (as said
term is defined  under the  Exchange  Act) and the  number of shares  being sold
during  any  three-month  period  not  exceeding  specified  limitations.   Each
certificate representing the Shares shall be stamped or otherwise imprinted with
a legend substantially similar to the following:

         THE SECURITIES  REPRESENTED  HEREBY HAVE NOT BEEN REGISTERED  UNDER THE
         SECURITIES  ACT OF 1933 (THE  "ACT")  AND MAY NOT BE  OFFERED,  SOLD OR
         OTHERWISE  TRANSFERRED,  ASSIGNED,  PLEDGED OR HYPOTHECATED  UNLESS AND
         UNTIL THEY ARE  REGISTERED  UNDER THE ACT OR UNLESS (A) THE COMPANY HAS
         RECEIVED AN

                                      11.

<PAGE>

         OPINION OF  COUNSEL  REASONABLY  SATISFACTORY  TO THE  COMPANY  AND ITS
         COUNSEL THAT SUCH REGISTRATION IS NOT REQUIRED OR (B) SUCH SALE IS MADE
         PURSUANT TO RULE 144 UNDER THE ACT.

         5.       MISCELLANEOUS.

                  5.1  Governing  Law. This  Agreement  shall be governed by and
construed  under the laws of the State of  California  as applied to  agreements
among California  residents,  made and to be performed entirely within the State
of California, without regard to principles of conflict of laws.

                  5.2  Successors  and Assigns.  Except as  otherwise  expressly
provided  herein,  the  provisions  hereof shall inure to the benefit of, and be
binding upon, the successors,  assigns, heirs, executors,  and administrators of
the  parties  hereto.  It is  acknowledged  and agreed  that  Oceana  Investment
Corporation  PLC may assign its rights and  obligations  under this Agreement to
one or more of its wholly owned subsidiaries.

                  5.3 Entire Agreement.  This Agreement and the Exhibits hereto,
and the other  documents  delivered  pursuant  hereto,  constitute  the full and
entire understanding and agreement among the parties with regard to the subjects
hereof and no party shall be liable or bound to any other party in any manner by
any representations, warranties, covenants, or agreements except as specifically
set forth herein or therein.  Nothing in this Agreement,  express or implied, is
intended  to confer  upon any  party,  other than the  parties  hereto and their
respective  successors  and  assigns,  any  rights,  remedies,  obligations,  or
liabilities under or by reason of this Agreement,  except as expressly  provided
herein.

                  5.4  Separability.  In case any  provision  of this  Agreement
shall be invalid, illegal, or unenforceable, it shall to the extent practicable,
be  modified  so as to make it  valid,  legal and  enforceable  and to retain as
nearly as practicable the intent of the parties, and the validity, legality, and
enforceability  of the remaining  provisions shall not in any way be affected or
impaired thereby.

                  5.5 Amendment and Waiver. Except as otherwise provided herein,
any term of this  Agreement  may be amended,  and the  observance of any term of
this  Agreement  may be waived  (either  generally or in a particular  instance,
either retroactively or prospectively, and either for a specified period of time
or  indefinitely),  with the written  consent of the Company and Purchaser.  Any
amendment or waiver  effected in  accordance  with this section shall be binding
upon any  holder of any  security  purchased  under  this  Agreement  (including
securities into which such securities have been  converted),  each future holder
of all such securities, and the Company.

                  5.6 Notices. All notices and other communications  required or
permitted  hereunder shall be in writing and shall be deemed  effectively  given
upon personal delivery, on the first business day following mailing by overnight
courier,  or on the fifth day following mailing by registered or certified mail,
return  receipt  requested,  postage  prepaid,  addressed  to  the  Company  and
Purchaser at the addresses included herein.

                                      12.
<PAGE>

                  5.7 Fees and Expenses.  Except as set forth in Section 3.9(g),
the  Company and  Purchaser  shall bear their own  expenses  and legal fees with
respect to this Agreement and the transactions contemplated hereby.

                  5.8 Titles and  Subtitles.  The titles of the  paragraphs  and
subparagraphs  of this  Agreement are for  convenience of reference only and are
not to be considered in construing this Agreement.

                  5.9 Counterparts. This Agreement may be executed in any number
of  counterparts,  each of which shall be deemed an  original,  but all of which
together shall constitute one instrument.





                                      13.
<PAGE>


         IN WITNESS WHEREOF,  the parties hereto have executed this Common Stock
Purchase Agreement as of the date set forth in the first paragraph hereof.

                                                     SUGEN, INC.



                                  By:      /s/ K. Peter Hirth, Ph.D.
                                           -------------------------------------
                                           Name:    K. Peter Hirth, Ph.D.
                                           Title:   Executive Vice President

                                  Address: 351 Galveston Drive
                                           Redwood City, CA 94063-4720



                                  OCEANA INVESTMENT CORPORATION PLC



                                  By:      /s/ Michael Lewis
                                           -------------------------------------
                                           Name:    Michael Lewis
                                           Title:   Director

                                  Address: Park Lorne
                                           111 Park Road
                                           London NW87SL England



                                      14.
<PAGE>


                                    EXHIBIT A

                  SCHEDULE OF EXCEPTIONS PURSUANT TO SECTION 3

         This Schedule of Exceptions is made and given  pursuant to Section 3 of
the Agreement.  The paragraph numbers in this Schedule of Exceptions  correspond
to the paragraph numbers in the Agreement;  however,  any information  disclosed
herein  under  any  paragraph  number  shall  be  deemed  to  be  disclosed  and
incorporated  into any other  paragraph  number under the  Agreement  where such
disclosure  would be appropriate.  Any terms defined in the Agreement shall have
the same meaning when used in this  Schedule of  Exceptions  as when used in the
Agreement unless the context otherwise requires.

<TABLE>
         3.2  Capitalization.  On June 30, 1998,  136,511 shares of Common Stock
were issued under the Company's Employee Stock Purchase Plan.

<CAPTION>
                                           Note Conversions Since March 31, 1998

Convertible Note Holder                           Number of Shares                      Date of Conversion
- -----------------------                           ----------------                      ------------------
<S>                                                    <C>                                    <C>  
Omicron Partners                                       270,460                                5/12/98
Delta Opportunity Fund                                 207,000                                5/22/98
Overbrook Fund                                          8,300                                 5/22/98
ACI/DA Investors                                       70,300                                 5/22/98
Omicron Partners                                       20,100                                 5/27/98
OTATO                                                  41,500                                 5/28/98
</TABLE>

<TABLE>

         3.13 Registration  Rights. The Company has granted  registration rights
to the  following  security  holders  with  respect  to  the  number  of  shares
indicated:

<CAPTION>
Security Holder                                                                         Number of Shares
- ----------------------------------------------------------------------------            ----------------
<S>                                                                                            <C>      
Asta Medica Aktiengesellschaft                                                                   449,802

Zeneca Limited                                                                                 1,071,016

AMGEN, Inc.                                                                                      200,000

Sanwa Business Credit Corp.                                                                        2,666

Dr. Heinrich Kuhn                                                                                 15,000

Financing for Science International, Inc.                                                         20,798

Genentech, Inc.                                                                                  133,333

Comdisco                                                                                          76,847

Vision Pharmaceuticals L.P.                                                                      191,571

Convertible Noteholders                                                                        1,780,000

</TABLE>




                                                                   Exhibit 10.73


                                            ***TEXT OMITTED AND FILED SEPARATELY
                                                CONFIDENTIAL TREATMENT REQUESTED
                                             UNDER 17 C.F.R. SS.SS.200.80(B)(4),
                                                            200.83 AND 240.24B-2


         THIS HEADS OF  AGREEMENT  entered  into as of the 30th day of June 1998
("Date  of the  Heads")  by and  between  SUGEN  INC.,  a  Delaware  corporation
("SUGEN") with offices at 351 Galveston  Drive,  Redwood City, CA 94063-4720 and
PROCHON BIOTECH LIMITED, an Israeli corporation  ("PROCHON") with its registered
office at Building 12, Kiryat Weizmann,  Science Park, P.O. 1482, Rehovot 76114,
Israel.


                                    RECITALS

         WHEREAS,  SUGEN is a leader in the  research and  development  of small
molecule drugs which modulate tyrosine kinase and tyrosine phosphotase signaling
pathways; and

         WHEREAS,  PROCHON  is a  leader  in the  research  and  development  of
treatments for skeletal disorders and bone- and cartilage-related diseases; and

         WHEREAS,  SUGEN and PROCHON desire to enter into a definitive agreement
establishing  a  collaborative  relationship  in  order  to  research,  develop,
manufacture  and market products for the treatment of  achondroplasia  and other
growth disorders; and

         WHEREAS,  SUGEN and  PROCHON  desire in the interim to enter into these
binding  Heads  of  Agreement  which  set  forth  the  principal  terms  of such
collaborative relationship;

         NOW, THEREFORE, in consideration of the foregoing and the covenants and
promises contained in this Heads of Agreement, the parties agree as follows;

                                    ARTICLE 1

                                   DEFINITIONS

         As used herein, the following terms shall have the following meanings:

         1.1  "Affiliate"  shall  mean any  company  or  entity  controlled  by,
controlling,  or under  common  control  with a party  hereto and shall  include
without limitation any company fifty percent (50%) or more of whose voting stock
or participating profit interest is owned or controlled, directly or indirectly,
by a party,  and any company  which owns or  controls,  directly or  indirectly,
fifty  percent (50%) of more of the voting stock of a party;  "Affiliate"  shall
specifically include, in the case of SUGEN, [...***...].


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* CONFIDENTIAL TREATMENT REQUESTED

                                       1

<PAGE>

         1.2 "Closely Related Compounds" shall mean a compound identified in the
Collaboration  which is  [...***...]*  of the  Collaboration  Compound and which
[...***...] as Collaboration Compound.

         1.3  "Collaboration"  shall mean the program of collaborative  research
and development described in Article 3.

         1.4 "Collaboration  Agreement" shall mean the definitive  collaboration
agreement to be entered by the parties on terms  including  (but not limited to)
the terms herein provided.

         1.5   "Collaboration   Compound"   the  compound   identified   in  the
Collaboration and selected by the RMC for development by PROCHON.

         1.6  "Confidential  Information"  shall mean each party's  confidential
information,  inventions,  know-how or data disclosed  pursuant to this Heads of
Agreement or Collaboration Agreement and shall include manufacturing, marketing,
financial,  personnel and other business information and plans, whether in oral,
written, graphic or electronic form.

         1.7 "Effective Date" shall mean the effective date of the Collaboration
Agreement.

         1.8 "Field of  Collaboration"  shall mean the discovery and development
of [...***...].

         1.9  "Field  of   Commercialization"   shall  mean  the   treatment  of
[...***...] in humans.

         1.10 "FTE" shall mean a full-time equivalent  scientific person year of
scientific  and/or technical work, on or directly related to the  Collaboration,
carried  out by one or more  employees  or  consultants  of SUGEN,  each of whom
devotes a portion of his or her time to the  Collaboration;  provided,  however,
that PROCHON  understands and agrees that SUGEN retains  complete  discretion to
change  the  identity,  the  frequency  and time which any  individual  employee
devotes to the  Collaboration.  Scientific  work on or  directly  related to the
Collaboration to be performed by SUGEN employees or consultants can include, but
is not  limited  to,  experimental  laboratory  work,  recording  and writing up
results,  reviewing literature and references,  holding scientific  discussions,
managing and leading scientific staff, and carrying out Collaboration management
duties  (including  service  on the  Research  Management  Committee  as defined
below).

         1.11  "License  Agreement"  shall mean an  agreement  pursuant to which
SUGEN grants PROCHON a worldwide exclusive license to develop,  make, have made,
use and sell a Licensed Product,  substantially in the form to be attached as an
Exhibit to the Collaboration Agreement.

         1.12  "Licensed  Product" shall mean any  pharmaceutical  product which
contains the Collaboration Compound or a Closely Related Compound substituted as
provided in Section 5.4, including all formulations, line extensions or modes of
administration thereof, for use within the Field of Commercialization.

- ----------
* CONFIDENTIAL TREATMENT REQUESTED

                                       2
<PAGE>

         1.13 "Net Sales" shall mean all revenues  recognized in accordance with
generally accepted  accounting  principles from the sale of the Licensed Product
or Retained  Products,  less  transportation  charges,  commissions,  discounts,
credits allowed for defective or returned goods and other  allowances  (actually
paid or  allowed,  including  but not  limited  to,  prompt  payment  and volume
discounts, charge backs from wholesalers and other allowances granted to the end
commercial customer of the Licensed Product or Retained Product, whether in cash
or  trade),  insurance  and sales and other  taxes  based on sales  prices  when
included in gross sales, but not including taxes assessed on income derived from
such sales.

         1.14 "Phase I" means those  clinical  trials on  sufficient  numbers of
normal  volunteers  and patients  that are designed to establish  that a drug is
safe for its  intended  use,  and to support its  continued  testing in Phase II
Clinical Trials.

         1.15 "Phase II" means those  clinical  trials on sufficient  numbers of
patients that are designed to establish the safety and biological  activity of a
drug for its  intended  use,  and to define  warnings,  precautions  and adverse
reactions  that  are  associated  with  the  drug  in  the  dosage  range  to be
prescribed.

         1.16 "Program Know-How" shall mean all tangible or intangible know-how,
trade  secrets,  inventions  (whether or not  patentable),  data,  clinical  and
preclinical  results,  information,  and any  physical,  chemical or  biological
material any replication or any part of such material all of which is in any way
derived from or developed  pursuant to  activities  undertaken in the conduct of
the Collaboration by either party or its consultants or collaborators.

         1.17  "Program  Technology"  shall  mean the  Program  Patents  and the
Program Know-How.

         1.18  "Program  Patents"  shall  mean all  patents,  both  foreign  and
domestic, including without limitation, all substitutions, extensions, reissues,
renewals and inventors  certificates  covering inventions made in the conduct of
the Collaboration by a party or its consultants or collaborators.

         1.19   "Regulatory   Approval"   shall  mean  any  approval   licenses,
registrations,  or  authorisations  of any  federal,  state or local  regulatory
agency,  department,  bureau  or  other  government  entity,  necessary  for the
manufacture,  use, storage,  import,  transport or sale of Licensed Product in a
country.

         1.20 "Research Management Committee" or "RMC" shall mean that committee
to be formed pursuant to Section 3.2.

         1.21 "Retained  Products" shall mean products  containing  compounds to
which SUGEN retains rights as provided in Section 5.6.

         1.22 "Term of the Collaboration"  shall have the meaning assigned to it
in Section 3.6.

         1.23 "Valid  Claim"  shall mean a patent  claim  contained  in a patent
application  which  has been  filed  for not more  than  five (5) years or in an
issued and  unexpired  patent which has not

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* CONFIDENTIAL TREATMENT REQUESTED

                                       3

<PAGE>

lapsed or been declared  invalid or unenforceable by a court in a decision which
is unappealable or is not appealed.

         1.24 "Workplan" shall have the meaning assigned to it in Section 4.1.

                                    ARTICLE 2

                         REPRESENTATIONS AND WARRANTIES

         2.1      Representations and Warranties of SUGEN

                  (a)  Corporate  Power.  SUGEN is duly  organized  and  validly
existing under the laws of Delaware and has full  corporate  power and authority
to enter into this Heads of Agreement and to carry out the provisions hereof.

                  (b) Due Authorization. SUGEN is duly authorised to execute and
deliver this Heads of Agreement and to perform its  obligations  hereunder.  The
person  executing  this  Heads of  Agreement  on  SUGEN's  behalf  has been duly
authorized to do so by all requisite corporate action.

                  (c) Binding Agreement.  This Heads of Agreement is a legal and
valid  obligation  binding upon SUGEN and  enforceable  in  accordance  with its
terms.  The  execution,  delivery and  performance of this Heads of Agreement by
SUGEN does not conflict with any agreement, instrument or understanding, oral or
written,  to which it is a party or by which it may be bound,  nor  violate  any
material law or regulation of any court,  governmental body or administrative or
other agency having jurisdiction over it.

                  (d) Grant of  Rights.  SUGEN has not,  and will not during the
term of this Heads of Agreement,  grant any right to any third party which would
conflict with the rights granted to PROCHON hereunder.

                  (e) Validity.  SUGEN is aware of no action, suit or inquiry or
investigation instituted by any governmental agency which questions or threatens
the validity of this Heads of Agreement.

         2.2      Representations and Warranties of PROCHON

                  (a)  Corporate  Power.  PROCHON is duly  organized and validly
existing under the laws of Israel and has full corporate  power and authority to
enter into this Heads of Agreement and to carry out the provisions hereof.

                  (b) Due  Authorization.  PROCHON is duly authorized to execute
and deliver this Heads of Agreement  and to perform its  obligations  hereunder.
The person  executing this Heads of Agreement on PROCHON's  behalf has been duly
authorized to do so by all requisite corporate action.

                  (c) Binding Agreement.  This Heads of Agreement is a legal and
valid  obligation  binding upon PROCHON and  enforceable in accordance  with its
terms.  The  

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* CONFIDENTIAL TREATMENT REQUESTED

                                       4
<PAGE>


execution,  delivery and  performance of this Heads of Agreement by PROCHON does
not conflict with any agreement,  instrument or understanding,  oral or written,
to which it is a party or by which it may be bound, nor violate any material law
or regulation of any court,  governmental body or administrative or other agency
having jurisdiction over it.

                  (d) Grant of Rights.  PROCHON has not, and will not during the
term of this Heads of Agreement,  grant any right to any third party which would
conflict with the rights granted to SUGEN hereunder.

                  (e) Validity.  PROCHON is aware of no action, suit, or inquiry
or  investigation  instituted  by any  governmental  agency  which  questions or
threatens the validity of this Heads of Agreement.

                                    ARTICLE 3

                       COLLABORATION SCOPE AND GOVERNANCE

         3.1  Objective of the Research  Collaboration.  The parties  agree to a
worldwide cooperative  arrangement within the Field of Collaboration as provided
in this Article 3.

         3.2 Research Management Committee. The goals of the Collaboration shall
be  determined  by, and progress of the  Collaboration  monitored by, a Research
Management  Committee comprised of two (2) representatives each from PROCHON and
SUGEN.  All decisions of the Research  Management  Committee shall be unanimous.
The  Committee  will  agree  the time  and  place  of  meetings,  substitutions,
qualifications and other similar matters.

         3.3  Functions  and Powers of the Research  Management  Committee.  The
Research  Management  Committee shall make  recommendations  to the parties with
respect to:

                           (i)  establishing  plans  designed to accomplish  the
goals of the Collaboration;

                           (ii)  allocating  tasks and  coordinating  activities
required to carry out the Collaboration;

                           (iii)   periodically   reviewing   and  revising  the
Collaboration;

                           (iv) determining  efficacy criteria for first in vivo
lead compound;

                           (v) monitoring  progress of the Collaboration and the
parties' diligence in carrying out their responsibilities thereunder;

                           (vi) encouraging and facilitating ongoing cooperation
between the parties; and

                           (vii)  such  other  matters  as  shall  be  expressly
directed to the RMC for  decision,  determination  or  selection by the terms of
this Agreement.


                                       5
<PAGE>

         3.4 Disagreements. In the event the Research Management Committee shall
be unable to agree the matter  shall be referred to the  respective  Chairman of
the Board of each party, unless otherwise stated in the Collaboration Agreement.

         3.5  Exclusivity.  SUGEN and PROCHON,  including  their  Affiliates and
consultants,  will collaborate with one another  exclusively with respect to the
Field of Collaboration during the Term of the Collaboration.

         3.6 Term of Collaboration. The Collaboration shall commence on the Date
of the Heads and continue for a period of [...***...]*,  subject to renewal upon
terms  mutually  agreeable to the parties and subject to earlier  termination of
this Head of Agreement as provided in Articles 11 ("Term of the Collaboration").

                                    ARTICLE 4

                         COLLABORATIVE RESEARCH PROGRAM

         4.1      Collaboration Activities

                  Commencing   promptly  after  the  Date  of  the  Heads,   and
continuing,  subject to Section 11.3 hereof,  until achievement of the milestone
event  referred to in Section  6.2,  each party shall  diligently  carry out the
activities in the Field of Collaboration  specified to be performed by it in the
outline of activities  set forth in the workplan to be attached as an exhibit to
the Collaboration  Agreement (the "Workplan").  After achievement of that event,
each  party  shall   conduct  such   additional   activities  in  the  Field  of
Collaboration  as they shall  agree.  In the event the  parties are unable to so
agree within  [...***...]  after achievement of such event, then (i) SUGEN shall
be  obligated to provide  [...***...]  until the  expiration  of the Term of the
Collaboration,  commencing on the first business day after such [...***...], and
PROCHON shall be obligated to pay SUGEN  $[...***...] per FTE and (ii) the tasks
and  activities  of such  FTEs  shall  be  determined  by the RMC.  The  parties
contemplate that the primary  responsibility in the  Collaboration  shall be, in
the case of SUGEN,  to identify the  Collaboration  Compound and, in the case of
PROCHON, to clinically develop the Collaboration Compound.

         4.2      Free Exchange of Information

                  Insofar as each party is legally permitted,  SUGEN and PROCHON
shall freely exchange  information relating to the Collaboration during the Term
of the Collaboration.

         4.3 Research  Support.  During the first year of the  Collaboration  or
until  achievement of the milestone  event described in Section 6.2, if earlier,
SUGEN shall provide at least [...***...] to support  collaborative  research and
development  activities and such  additional  FTEs as shall be determined by the
RMC to be  necessary.  Thereafter  during the  Collaboration,  SUGEN and PROCHON
shall  provide  such  research  and  development  support as they shall agree as
provided in the second sentence of Section 4.1.

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* CONFIDENTIAL TREATMENT REQUESTED

                                       6
<PAGE>

                                    ARTICLE 5

                          PRODUCT DEVELOPMENT; LICENSES

         5.1 Selection of  Collaboration  Compound.  On or before the end of the
Term of the Collaboration,  the RMC shall select the Collaboration Compound. The
RMC shall begin meeting as promptly as  practicable  after the Date of the Heads
and  shall  select  and  agree  on  the  criteria  for  the   selection  of  the
Collaboration Compound.

         5.2  Commercial   License  of  PROCHON.   Upon  the  selection  of  the
Collaboration  Compound,  SUGEN and PROCHON shall enter into a License Agreement
granting PROCHON an exclusive  worldwide license of the commercial rights to the
Collaboration   Compound   as  a   Licensed   Product   within   the   Field  of
Commercialization.  Such License  Agreement  shall require  PROCHON to pay SUGEN
royalties on annual  worldwide Net Sales of the Licensed Product at a rate equal
to  [...***...]  of Net  Sales  of  Licensed  Product,  and at a rate  equal  to
[...***...] of sub-licensing payments received.

         5.3 Development of Collaboration Compound. PROCHON shall be responsible
for all clinical testing of the Licensed Product at its own expense. The License
Agreement  shall  obligate  PROCHON  or its  sublicensee  to  diligently  pursue
commercialization of the Licensed Product; provided, however, that if PROCHON or
its sublicensee  fails to commence Phase I Clinical Trials within one year after
the filing of an IND for the  Licensed  Product  (unless  such failure is due to
PROCHON's or its sublicensee's  difficulty in enrolling patients in such Phase I
Clinical Trials) or to diligently  continue  thereafter,  all  commercialization
rights shall revert,  after notice and  opportunity to cure, to SUGEN subject to
the  payment of  royalties  equal to  [...***...]  of Net Sales if the  Licensed
Product  has not  completed  Phase 1  clinical  testing,  [...***...]  if it has
completed  Phase  1  but  has  not  completed  Phase  II  clinical  testing  and
[...***...] if it has completed  Phase II clinical  testing.  In the event SUGEN
shall desire to use clinical data obtained by PROCHON, it will reimburse PROCHON
its reasonable actual costs therefor.

         5.4 Back-up Compounds

                  (a) During a period of [...***...] after the effective date of
the License  Agreement,  SUGEN will reserve up to  [...***...]  Closely  Related
Compounds  identified  by the  RMC as back up  compounds  for the  Collaboration
Compound.  SUGEN will not  develop or license  others to develop for any purpose
either of such Closely Related  Compounds  during such period prior to the date,
if any, PROCHON elects to substitute as hereinafter provided. PROCHON may during
such period elect to substitute a Closely Related Compound for the Collaboration
Compound.  Upon written notice to SUGEN identifying the Closely Related Compound
to be so substituted  the License  Agreement will be amended as may be necessary
so that such Closely Related  Compound shall become the Licensed Product for all
purposes  and all rights to the  Collaboration  Compound  shall revert to SUGEN,
subject to Section  5.6.  After any such  substitution,  PROCHON may during such
period  elect  to  substitute  the  [...***...]  Closely  Related  Compound  for
[...***...]  Closely Related Compound.  Upon written notice to SUGEN identifying
the Closely Related Compound to be so substituted the License  Agreement will be

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* CONFIDENTIAL TREATMENT REQUESTED

                                       7

<PAGE>


amended as may be necessary so that such Closely  Related  Compound shall become
the  Licensed  Product  for all  purposes  and all  rights to the  Collaboration
Compound and [...***...]Closely  Related Compound shall revert to SUGEN, subject
to Section 5.6.

                  (b) If by the [...***...] anniversary of the Date of the Heads
PROCHON obtains competent  evidence that neither the Collaboration  Compound nor
any Closely  Related  Compound is suitable for  development  within the Field of
Commercialization,  then PROCHON may present  such  evidence in writing to SUGEN
and request SUGEN's  assistance to develop one (1) or more additional  compounds
for use within the Field of  Commercialization.  If PROCHON elects to do so, the
parties  will  negotiate  in good faith to develop a  modified  Workplan  and to
establish  mutually  acceptable  funding to support SUGEN's  performance of such
development  activities.  Any compounds  with respect to which SUGEN has a prior
commitment to a third party or to an established  internal  development  program
(to be defined in the Collaboration Agreement) shall not be available for use in
any development activities conducted pursuant to this Section 5.4(b).

         5.5 Research License to PROCHON. During the Collaboration, SUGEN grants
to PROCHON such  licenses or  sublicenses  as shall be necessary  for PROCHON to
participate in the Collaboration.

         5.6 SUGEN Retained Rights.  SUGEN shall retain the exclusive  worldwide
right  outside  of the Field of  Commercialization  to  commercialize  compounds
identified in the Collaboration  not selected as the  Collaboration  Compound or
Closely Related Compound.  With respect to (i) novel compounds (i.e.,  compounds
other  than  those  that  are  claimed  in  issued  patents  or  pending  patent
applications  owned or  controlled  by SUGEN as of the  Effective  Date or other
compounds disclosed in invention  disclosures provided by SUGEN's patent counsel
to  PROCHON's  counsel  as of the  Effective  Date)  made in the  course  of the
Collaboration,  and (ii) other  compounds  having activity  previously  known to
SUGEN that are determined  during the course of the  Collaboration  to be active
with  respect to  [...***...],  if  PROCHON  contributes  intellectual  property
valuable  to the  commercialization  of such  compounds  outside  the  Field  of
Commercialization,  SUGEN shall pay PROCHON  royalties on annual  worldwide  Net
Sales of such compounds at a rate equal to  [...***...]  of Net Sales,  and at a
rate equal to [...***...] of sub-licensing  revenues.  SUGEN agrees it will not,
and will not license others to  commercialize  any compound for use in the Field
of  Commercialization  so long as  PROCHON  continues  to develop  the  Licensed
Product as  provided  in Section 5.3 hereof and to  commercialize  the  Licensed
Product as will be provided in the License Agreement.

         5.7 Royalty Adjustments.  In the event PROCHON shall be required to pay
a royalty to a third party because the sale of the Licensed Product  infringes a
Valid Claim of an issued patent  claiming a composition  of matter,  PROCHON may
offset [...***...] of such royalty amount against the royalties payable to SUGEN
under the License Agreement.  During such period that the Licensed Product shall
not be the subject of a Valid Claim for the  composition of matter,  the royalty
rates specified in Section 5.2 shall be reduced by [...***...].

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* CONFIDENTIAL TREATMENT REQUESTED

                                       8
<PAGE>

         5.8 Research License to SUGEN. During the Collaboration, PROCHON grants
to SUGEN  such  licenses  or  sublicenses  as shall be  necessary  for  SUGEN to
participate in the Collaboration.

         5.9  PROCHON  Option to Propose  Joint  Commercialization.  The License
Agreement shall provide that, at PROCHON's  option,  the parties will enter into
negotiations  relating to the possible joint  commercialization  of the Licensed
Product [...***...].

                                    ARTICLE 6

                                FINANCIAL SUPPORT

         6.1 Research  Payments.  PROCHON shall pay SUGEN  concurrently with the
execution of the Heads of Agreement $750,000 in support of SUGEN's activities in
the Collaboration.  After achievement of the milestone described in Section 6.2,
PROCHON  shall pay SUGEN  $[...***...]  for  [...***...]  provided  pursuant  to
Section 4.1 or such other number of FTEs as the parties may mutually agree or as
the RMC may approve,  quarterly in advance.  PROCHON shall  reimburse  SUGEN for
[...***...] SUGEN provides to the Collaboration. PROCHON shall pay SUGEN for the
cost of services  provided by third parties approved by the RMC, upon receipt of
invoice from SUGEN.

         6.2  Milestone  Payments.  Except  as  otherwise  hereinafter  provided
PROCHON shall pay SUGEN a nonrefundable  payment of  $[...***...]  within thirty
(30)  days of the date the  parties  succeed  in  [...***...]  which  meets  RMC
specified efficacy criteria,  which criteria the RMC shall select and agree upon
promptly after the Date of the Heads.

         6.3 Miscellaneous Payment Provisions.  The Collaboration Agreement will
include  terms  concerning  the method of making  payments,  late  payments  and
withholding on payments.

         6.4  Cooperation  Concerning  BIRD  Funding.  SUGEN will  provide  such
reasonable  assistance to PROCHON in submitting an application  for BIRD funding
as it shall  determine to be appropriate  in light of the rules and  regulations
governing such applications.

                                    ARTICLE 7

                              INTELLECTUAL PROPERTY

         7.1 Ownership of Program Technology.  Subject to the licenses described
in Article 5, all Program Technology invented, discovered or developed solely by
the employees  and agents of one party shall be owned by that party.  Subject to
the licenses described in Article 5, all Program Technology invented, discovered
or developed  jointly by the  employees and agent of both parties shall be owned
solely  by  [...***...]  if it  relates  to  [...***...]  within  the  Field  of
Collaboration,  solely owned by  [...***...]  if it relates to  [...***...]  and
jointly owned in all other cases.

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* CONFIDENTIAL TREATMENT REQUESTED

                                       9
<PAGE>

         7.2 Patenting of Program Technology. Each party shall be responsible at
its own expense and with counsel of its  choosing,  for the filing,  prosecution
and  maintenance  of patent  applications  and patents  throughout the world for
Program  Technology  owned  solely by it. The RMC shall  determine  the party so
responsible in the case of jointly owned Program  Technology.  The parties shall
consult from time to time concerning the countries in which patent  applications
are filed as well as the scope of protection to be sought.

                                    ARTICLE 8

                         TRADEMARK AND OTHER PROVISIONS

         The Collaboration Agreement or License Agreement, as appropriate,  will
contain such other  provisions as the parties may agree  concerning  the Program
Technology, including without limitation,  enforcement and defense against third
parties patents and will provide for terms and conditions concerning the use and
protection of trademarks approved by each party.

                                    ARTICLE 9

                             INFORMATION AND REPORTS

         The parties will make available and disclose to one another all results
of the work conducted in the  Collaboration.  All discoveries or inventions made
by either party  hereunder  will be promptly  disclosed to the other party.  The
parties will exchange,  on a periodic basis,  verbal or written reports of their
development  work.  The  Collaboration  Agreement will provide the frequency and
manner of information exchanged between the parties.

                                   ARTICLE 10

                          CONFIDENTIALITY; PUBLICATION

         10.1 Confidentiality. Except to the extent expressly authorized by this
Heads of Agreement or  otherwise  agreed in writing by the parties,  the parties
agree  that,  for the term of this  Heads  of  Agreement  and the  Collaboration
Agreement  and for  [...***...]  thereafter,  the  receiving  party  shall  keep
confidential  and shall not publish or otherwise  disclose and shall not use for
any  purpose  other than as provided  for in such  Agreements  any  Confidential
Information  furnished  to it by the other  party  pursuant  to such  Agreements
unless  the  receiving  party  can  demonstrate  by  competent  proof  that such
Information:

                  (a) was already known to the receiving party, other than under
an obligation of confidentiality, at the time of disclosure by the other party;

                  (b) was generally available to the public or otherwise part of
the public domain at the time of its disclosure to the receiving party;

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* CONFIDENTIAL TREATMENT REQUESTED

                                       10
<PAGE>


                  (c) became generally available to the public or otherwise part
of the public  domain  after its  disclosure  and other than  through any act or
omission of the receiving party in breach of such Agreements;

                  (d) was disclosed to the receiving party,  other than under an
obligation  of  confidentiality  to a third  party,  by a third party who had no
obligation to the disclosing  party not to disclose such  information to others;
or

                  (e) was independently discovered or developed by the receiving
party without the use of  Confidential  Information  belonging to the disclosing
party.

         10.2  Authorized  Disclosure.  Each  party  may  disclose  Confidential
Information  belonging  to the other  party to the  extent  such  disclosure  is
reasonably necessary in connection with:

                  (a)  filing  or  prosecuting   patents  relating  to  Licensed
Products or Projects;

                  (b) regulatory filings;

                  (c) prosecuting or defending litigation;

                  (d) complying with applicable governmental regulations;

                  (e)  conducting  pre-clinical  or clinical  trials of Licensed
Products; or

                  (f)  disclosure to Affiliates who agree to be bound by similar
terms of confidentiality.

         Notwithstanding the foregoing, in the event a party is required to make
a disclosure  of the other  party's  Confidential  Information  pursuant to this
Section 10.2 it will, except where impracticable, give reasonable advance notice
to  the  other  party  of  such  disclosure  and  use  best  efforts  to  secure
confidential  treatment of such information.  In any event, the parties agree to
take all  reasonable  action to avoid  disclosure  of  Confidential  Information
hereunder.

         10.3  Publications.  Each party  primarily  responsible  for a proposed
publication,  whether  written or oral,  shall at least  thirty (30) days before
presentation or submission of the proposed  publication to a third party, submit
such  proposed  publication  to each member of the RMC for review in  connection
with  obtaining or  preservation  of patent rights  and/or to determine  whether
Confidential  Information  should be  modified  or  deleted.  The RMC shall have
thirty (30) days in which to review each proposed publication. The review period
may be  extended  for an  additional  thirty  (30) days when the RMC  provides a
reasonable  need  for  such  extension,   including,  but  not  limited  to  the
preparation and filing of pertinent patent applications.

         10.4 Nondisclosure and Invention Assignment  Agreements.  Each employee
or consultant of SUGEN or PROCHON and each third party who is  participating  in
research  or  development   of  Licensed   Products   hereunder   shall  sign  a
nondisclosure  and  invention   assignment   agreement  in  form  and  substance
satisfactory to both SUGEN and PROCHON.


- ----------
* CONFIDENTIAL TREATMENT REQUESTED

                                       11
<PAGE>


         10.5 This Heads of Agreement. The parties agree that the material terms
of this Agreement shall be considered Confidential Information. The parties will
consult with one another and agree on the  provisions of this Heads of Agreement
to be  redacted  in any  filings  made by the  parties  with the  United  States
Securities and Exchange Commission or as otherwise required by law.

                                   ARTICLE 11

                        TERM AND TERMINATION OF AGREEMENT

         11.1 Term.  Unless earlier  terminated in accordance with Section 11.2,
this Heads of Agreement  shall  expire upon the earlier of the  execution of the
Collaboration  Agreement or the  expiration of the last to expire Program Patent
for which a license is granted hereby.

         11.2 Termination for Material  Breach.  Each party shall have the right
to terminate  this Heads of Agreement  after  appropriate  written notice to the
other that the other is in material  breach of this Heads of  Agreement,  unless
the other  party  cures the breach  within  thirty  (30) days of the date notice
thereof was given,  or, in the case breach  cannot be cured in such period,  the
party  continues  to use  diligent  efforts to cure such breach  until  actually
cured. Licenses granted to the non-breaching party under this Heads of Agreement
shall not be affected by termination  for material  breach.  All licenses to the
breaching party shall automatically terminate upon such termination.

         11.3  Termination  for Failure to Achieve  Milestone.  Either party may
terminate  this Heads of Agreement in the event the milestone  event referred to
in Section 6.2 is not achieved within [...***...] after the Date of the Heads.

         11.4 Accrued Rights,  Surviving Obligations.  Termination of this Heads
of Agreement  shall not affect any accrued rights of either party.  The terms of
Section 5.6, in the case of termination  pursuant to Section 11.3, Section 11.4,
and  Articles  7, 10,  14,  and 16 shall  survive  termination  of this Heads of
Agreement.

                                   ARTICLE 12

                                    INDEMNITY

         The  Collaboration  Agreement  shall  provide  that the  parties  shall
indemnify  one another  for their own  negligent  actions and shall  prescribe a
method for notifying one another of any legal actions and allocating the primary
responsibility for defense of any claims.

                                   ARTICLE 13

                          REPRESENTATIONS & WARRANTIES

         In  the   Collaboration   Agreement   each  party  shall  make  various
representations and warranties  regarding corporate power, due authorization and
the binding nature of the agreement.

- ----------
* CONFIDENTIAL TREATMENT REQUESTED

                                      12
<PAGE>

                                   ARTICLE 14

                        GOVERNING LAW; DISPUTE RESOLUTION

         14.1 Governing Law; Language. This Heads of Agreement shall be governed
by California  law without  regard to its  principles of conflict of laws.  This
Heads of Agreement  has been  prepared and shall be  interpreted  in the English
language.

         14.2 Legal  Compliance.  Within  thirty  days of the date  hereof,  the
parties  shall  review in good faith and  cooperate  in taking  such  actions to
ensure  compliance  of this  Heads of  Agreement  and the terms of the  proposed
Collaboration Agreement with all applicable laws, including without limitation.

         14.3 Dispute Resolution. In the event of any dispute, the parties shall
refer such dispute to the Chairman of the Board of SUGEN and the Chairman of the
Board of PROCHON for  attempted  resolution  by good faith  negotiations  within
thirty (30) days after such referral is made. The  Collaboration  Agreement will
provide for such further dispute resolution mechanisms as the parties may agree.

                                   ARTICLE 15

                   NEGOTIATION OF THE COLLABORATION AGREEMENT

         15.1 Completion of Collaboration Agreement.  Following the execution of
this Heads of Agreement  both SUGEN and PROCHON agree to negotiate in good faith
and proceed expeditiously to complete the terms of the Collaboration  Agreement,
within thirty (30) days of date hereof.

         15.2  Provisions  to be Included.  The  Collaboration  Agreement  shall
include the terms  specified in this Heads of  Agreement  and shall also include
provisions those customary in agreements of the character between pharmaceutical
companies including,  without limitation, those relating to: relationship of the
parties,   arbitration  or  other  alternative  dispute  resolution   mechanism,
assignments, force majeure, notices, amendments, waiver, counterparts, headings,
governing law, language, entire agreement, severability, public announcements.

         15.3  Mediation of Issues.  If by the date specified in Section 15.1 or
any  mutually   agreed   extension  date  the  parties  have  not  executed  the
Collaboration  Agreement  then either party may give notice to the other that it
wants a mediator to be appointed to aid the parties in resolving  any  remaining
issues.  If such notice is given the parties  shall  within the next thirty (30)
days agree  upon a  mediator  failing  which  either  party  shall  request  the
International  Chamber of Commerce  to appoint a mediator  having  expertise  in
agreements of the character of this Heads of Agreement  among  biopharmaceutical
companies. The parties shall meet with such mediator over a period of forty-five
(45) days in good faith to resolve any  outstanding  issues and to finalize  the
Collaboration  Agreement.  If after  such  period  the  parties  have  still not
finalized the  Collaboration  Agreement the mediator  shall set the terms of any
remaining  issues,  and  such  terms  shall  become  part  of the  Collaboration
Agreement and shall be binding upon the parties.

- ----------
* CONFIDENTIAL TREATMENT REQUESTED

                                       13
<PAGE>

                                   ARTICLE 16

                              PUBLIC ANNOUNCEMENTS

         Each party agrees  that,  prior to the  execution of the  Collaboration
Agreement,  except  as may be  required  by  law,  it  shall  not  disclose  the
existence,  substance  or details of this Heads of  Agreement  without the prior
written  consent  of the  other  party,  such  consent  not  to be  unreasonably
withheld.  Nothing  herein  shall  prevent  either  party from  disclosing  such
information as reasonably  necessary to its Affiliates;  provided however,  each
party shall take such steps necessary to ensure that such Affiliates agree to be
bound to the provisions of this Article 16. In cases in which  disclosure may be
required by law, the disclosing  party,  prior to such disclosure,  shall notify
the non-disclosing party of the contents of the proposed disclosure.  Consistent
with  applicable  law,  the  non-disclosing  party  shall have the right to make
reasonable  changes to the disclosure to protect its  interests.  The disclosing
party shall not unreasonably refuse to include such changes in its disclosure.

                                   ARTICLE 17

                                    SEVERANCE

         If any Article or part  thereof of this Heads of  Agreement is declared
invalid  by any court of  competent  jurisdiction,  or any  government  or other
agency  having  jurisdiction  over either SUGEN or PROCHON  deems any Article or
part  thereof to be contrary to any  anti-trust  or  competition  laws then such
declaration shall not affect the remainder of the Article or other Articles.  To
the extent  possible the parties shall revise such  invalidated  Article or part
thereof in a manner that will render such provision valid without  impairing the
parties original interest.

                                       14

<PAGE>




         IN WITNESS WHEREOF, the parties hereto have duly executed this Heads of
Agreement.

SUGEN INC.                                 PROCHON BIOTECH LIMITED



By:      /s/ K. Peter Hirth, Ph.D.         By:      /s/ Michael Lewis
     ----------------------------------         --------------------------------
         K. Peter Hirth, Ph.D.                      Michael Lewis
         Executive Vice President                   Director





                                       15

<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>
         The Schedule contains Summary Financial  Information  extraced from the
         Company's  Form  10-Q for the Six  Months  Ended  June 30,  1998 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-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   JUN-30-1998
<CASH>                                          23,816
<SECURITIES>                                    51,479
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                76,286
<PP&E>                                          11,561
<DEPRECIATION>                                   6,960
<TOTAL-ASSETS>                                  84,825
<CURRENT-LIABILITIES>                           15,160
<BONDS>                                              0
                                0
                                          0
<COMMON>                                       141,579
<OTHER-SE>                                      92,566
<TOTAL-LIABILITY-AND-EQUITY>                    84,825
<SALES>                                              0
<TOTAL-REVENUES>                                 2,351
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                11,711
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 399
<INCOME-PRETAX>                                (10,875)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (10,875)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (10,875)
<EPS-PRIMARY>                                     (.69)
<EPS-DILUTED>                                     (.69)
        


</TABLE>


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