ONYX PHARMACEUTICALS INC
10-Q, 1999-05-17
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>

                      U.S. SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, D.C.  20549

                                -------------------
                                          
                                     FORM 10-Q
                                          
                                          

(X)  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
     ACT OF 1934

For the quarterly period ended March 31, 1999

                                          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:  0-28298
                         -------
                                          
                                          
                             ONYX PHARMACEUTICALS, INC.
               (Exact name of registrant as specified in its charter)
                                          
DELAWARE                                               94-3154463
- --------                                               ----------
(State or other jurisdiction of                        (IRS Employer ID Number)
incorporation or organization)

                                3031 Research Drive
                             Richmond, California 94806
                      (Address of principal executive offices)
                                          
                                   (510) 222-9700
                (Registrant's telephone number including area code)
                                          
Check whether the issuer (1) filed all reports required to be filed by Section
13 or 15(d) of the Exchange Act during the past 12 months (or for such shorter
period that the registrant was required to file such reports), and (2) has been
subject to such filing requirements for the past 90 days.  
          (X)   Yes                ( )   No

The number of outstanding shares of the registrant's Common Stock, $0.001 par
value, was 11,468,927 as of April 30, 1999.

<PAGE>

                             ONYX PHARMACEUTICALS, INC.
                                          
                                        INDEX
                                          
                                          
PART I:  FINANCIAL INFORMATION

<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----
<S>                                                                      <C>
ITEM 1.    Financial Statements 

               Condensed Balance Sheets - March 31, 1999 and
                December 31, 1998                                           3

               Condensed Statements of Operations - Three months  
               ended March 31, 1999 and 1998                                4

               Condensed Statements of Cash Flows - Three months ended
               March 31, 1999 and 1998                                      5

               Notes to Condensed Financial Statements                      6

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

ITEM 3.    Quantitative and Qualitative Disclosures About Market Risk      11


PART II:  OTHER INFORMATION

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

SIGNATURES                                                                  13

EXHIBIT INDEX                                                               14
</TABLE>



                                       2
<PAGE>
                             ONYX PHARMACEUTICALS, INC.


PART I:  FINANCIAL INFORMATION

ITEM 1.  FINANCIAL STATEMENTS

                              CONDENSED BALANCE SHEETS
                         (IN THOUSANDS, EXCEPT SHARE DATA)

<TABLE>
<CAPTION>
                                                                                   March 31,         December 31,
                                                                                      1999               1998
                                                                                  --------------    ---------------
                                    ASSETS                                        (Unaudited)          (Note 1)
<S>                                                                               <C>               <C>
Current assets:
     Cash and cash equivalents                                                        $ 16,146           $ 21,368
     Short-term investments                                                             10,510             10,792
     Other current assets                                                                  586                609
                                                                                  --------------    ---------------
         Total current assets                                                           27,242             32,769

Property and equipment, net                                                              3,494              3,730
Notes receivable from related parties                                                      531                649
Other assets                                                                                39                 59
                                                                                  --------------    ---------------
                                                                                      $ 31,306           $ 37,207
                                                                                  --------------    ---------------
                                                                                  --------------    ---------------

                     LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
     Accounts payable                                                                 $  1,056           $  2,371
     Accrued liabilities                                                                 2,659              2,456
     Accrued clinical trials and related expenses                                        2,067              2,176
     Accrued compensation                                                                  820                658
     Deferred revenue                                                                    2,087              3,318
     Long-term debt, current portion                                                     2,199              2,199
                                                                                  --------------    ---------------
         Total current liabilities                                                      10,888             13,178

Long-term debt, noncurrent portion                                                       1,832              2,382
Deferred rent                                                                                7                 28

Stockholders' equity:
     Preferred stock, $0.001 par value; 5,000,000 shares authorized; none
     issued and outstanding                                                                 -                  -
     Common stock, $0.001 par value; 25,000,000 shares authorized, 11,464,751
     and 11,452,457 shares issued and outstanding as of March 31, 1999 and
     December 31, 1998, respectively                                                        11                 11
     Additional paid-in capital                                                         85,086             85,073
     Deferred compensation                                                                (139)              (194)
     Accumulated deficit                                                               (66,379)           (63,271)
                                                                                  --------------    ---------------
         Total stockholders' equity                                                     18,579             21,619
                                                                                  --------------    ---------------
                                                                                      $ 31,306           $ 37,207
                                                                                  --------------    ---------------
                                                                                  --------------    ---------------
</TABLE>

                               See accompanying notes.


                                       3
<PAGE>
                             ONYX PHARMACEUTICALS, INC.


                         CONDENSED STATEMENTS OF OPERATIONS
                      (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
                                    (UNAUDITED)
                                          

<TABLE>
<CAPTION>
                                                                        Three Months Ended
                                                                             March 31,
                                                                   -------------------------------
                                                                        1999             1998
                                                                   ---------------   -------------
<S>                                                                <C>               <C>
Revenue:
     Contract and other revenue ($2,618 and $2,934  from
     related parties for the three months ended March 31, 1999
     and 1998, respectively)                                             $ 3,219         $ 3,332

Operating expenses:
     Research and development                                              5,291           6,065
     General and administrative                                            1,321           1,290
                                                                   ---------------   -------------
         Total operating expenses                                          6,612           7,355
                                                                   ---------------   -------------
Loss from operations                                                      (3,393)         (4,023)

Interest income, net                                                         285             484
                                                                   ---------------   -------------
Net loss                                                                 $(3,108)        $(3,539)
                                                                   ---------------   -------------
                                                                   ---------------   -------------
Basic and diluted net loss per share                                     $ (0.27)        $ (0.32)
                                                                   ---------------   -------------
                                                                   ---------------   -------------
Shares used in computing basic and diluted net loss per share             11,460          11,074
                                                                   ---------------   -------------
                                                                   ---------------   -------------
</TABLE>

                               See accompanying notes.


                                       4
<PAGE>
                             ONYX PHARMACEUTICALS, INC.


                         CONDENSED STATEMENTS OF CASH FLOW
                                   (IN THOUSANDS)
                                    (UNAUDITED)

<TABLE>
<CAPTION>
                                                                                          Three Months Ended
                                                                                              March 31,
                                                                                  --------------------------------
                                                                                      1999              1998
                                                                                  --------------    --------------
<S>                                                                               <C>               <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net loss                                                                          $ (3,108)        $ (3,539)
  Adjustments to reconcile net loss to net cash used in
     operating activities:
  Depreciation and amortization                                                          518              516
  Forgiveness of notes receivable                                                         24               30
  Amortization of deferred compensation                                                   55               55
  Changes in assets and liabilities:
      Other current assets                                                                68              440
      Other assets                                                                        20              (20)
      Accounts payable                                                                (1,315)            (499)
      Accrued clinical trials and related expenses                                      (109)             546
      Accrued liabilities                                                                203              448
      Accrued compensation                                                               162              254
      Deferred revenue                                                                (1,231)             251
      Deferred rent                                                                      (21)             (20)
                                                                               --------------   --------------
        Net cash used in operating activities                                         (4,734)          (1,538)
                                                                               --------------   --------------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Purchases of short-term investments                                                 (2,721)          (6,171)
  Sales and maturities of short-term investments                                       3,003           14,644
  Capital expenditures                                                                  (327)            (238)
  Notes receivable from related parties                                                   94                8
                                                                               --------------   --------------
        Net cash provided by investing activities                                         49            8,243
                                                                               --------------   --------------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Payments on long-term debt                                                            (550)            (237)
  Net proceeds from issuances of common stock, net of repurchases                         13            9,857
                                                                               --------------   --------------
        Net cash provided by (used in) financing activities                             (537)           9,620
                                                                               --------------   --------------
  Net increase (decrease) in cash and cash equivalents                                (5,222)          16,325
  Cash and cash equivalents at beginning of period                                    21,368           18,828
                                                                               --------------   --------------
        Cash and cash equivalents at end of period                                  $ 16,146         $ 35,153
                                                                               --------------   --------------
                                                                               --------------   --------------
</TABLE>

                               See accompanying notes.


                                       5
<PAGE>
                             ONYX PHARMACEUTICALS, INC.


                      NOTES TO CONDENSED FINANCIAL STATEMENTS
                                   MARCH 31, 1999
                                    (UNAUDITED)
                                          

NOTE 1.  BASIS OF PRESENTATION

The accompanying unaudited condensed financial statements have been prepared in
accordance with generally accepted accounting principles for interim financial
information and with the instructions to Form 10-Q.  Accordingly, they do not
include all of the information and footnotes required by generally accepted
accounting principles for complete financial statements.  In the opinion of
management, all adjustments (consisting of normal recurring accruals) considered
necessary for a fair presentation have been included.  Operating results for the
three months ended March 31, 1999, are not necessarily indicative of the results
that may be expected for the year ending December 31, 1999, or for any other
future operating periods.

The balance sheet at December 31, 1998 has been derived from the audited
financial statements at that date but does not include all of the information
and footnotes required by generally accepted accounting principles for complete
financial statements.

For further information, refer to the financial statements and footnotes thereto
included in the Onyx Pharmaceuticals, Inc. (the "Company" or "Onyx") Annual
Report on Form 10-K for the year ended December 31, 1998.


NOTE 2.  NET LOSS PER SHARE

In accordance with Financial Accounting Standards Board ("FASB") Statement of 
Financial Accounting Standards (SFAS) No. 128, basic and diluted net loss per 
share have been computed using the weighted-average number of shares of 
common stock outstanding during the period, less shares subject to 
repurchase.  Common stock equivalents have been excluded, because they would 
be antidilutive for the periods presented.

                                       6
<PAGE>
                             ONYX PHARMACEUTICALS, INC.


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

EXCEPT FOR THE HISTORICAL INFORMATION CONTAINED HEREIN, THIS OVERVIEW AND THE
FOLLOWING DISCUSSION CONTAIN FORWARD-LOOKING STATEMENTS THAT INVOLVE RISKS AND
UNCERTAINTIES.  THE COMPANY'S ACTUAL RESULTS COULD DIFFER MATERIALLY FROM THOSE
DISCUSSED HERE.  FACTORS THAT COULD CAUSE OR CONTRIBUTE TO SUCH DIFFERENCES
INCLUDE, BUT ARE NOT LIMITED TO, THOSE DISCUSSED IN THE ANNUAL REPORT ON FORM
10-K FOR THE YEAR ENDED DECEMBER 31, 1998.

OVERVIEW

Since its inception, Onyx Pharmaceuticals Inc. (the "Company" or "Onyx") has
been engaged in the discovery and development of novel therapeutics including
both small molecule drugs and therapeutic viruses which are based upon the
genetics of human disease. The Company has initially chosen to focus its
research in the area of cancer. The Company intends to pursue its therapeutic
discovery programs independently and in collaboration with pharmaceutical
companies, and to collaborate with such companies on the development and
commercialization of any products which may result from the Company's discovery
programs. The Company has entered into collaborative agreements with Bayer
Corporation ("Bayer") in the area of ras oncogenes and Eli Lilly and Company
("Eli Lilly") on the function of the BRCA1 gene in breast cancer.  The Company
has also entered into two separate collaborative agreements with Warner-Lambert
Company ("Warner-Lambert"), one in cell cycle mutations in cancer and a second
pertaining to inflammatory and autoimmune diseases. 

On February 1, 1999, Bayer and the Company signed an amendment to their 
collaboration agreement.  Based on the amendment, a lead development compound 
was named, and the focus of the collaboration moved from research to 
co-development.  The Company has the opportunity to co-develop collaboration 
compounds worldwide excluding Japan, in return for up to a 50 percent share 
of profits if the Company co-promotes the product in the United States.  To 
assist in funding part of its share of development costs, the Company could 
receive up to $40,000,000 in advances on the achievement of clinical 
milestones.

The amendment also states that upon the completion by the Company of certain
deliverables, Bayer will pay to the Company the final payment of approximately
$376,000 due in support of the research under the research portion of the
agreement.  It is anticipated this will occur in 1999.

The Company has not been profitable since inception and expects to incur
substantial and increasing losses for the foreseeable future, primarily due to
the expansion of its research and development programs, including preclinical
studies and clinical trials to develop ONYX-015, the lead product in the
Company's p53 therapeutic virus program. The Company expects that losses will
fluctuate from quarter to quarter and that such fluctuations may be substantial.
As of March 31, 1999, the Company's accumulated deficit was approximately
$66,400,000. 

In order to refocus the Company's resources on more near-term product
opportunities, in February 1999, the Company reduced its workforce by 14 regular
full-time employees as part of a corporate downsizing and incurred an expense of
approximately $250,000.

The Company's business is subject to significant risks, including the risks
inherent in its research and development efforts, the results of the ONYX-015
clinical trials, uncertainties associated with obtaining and enforcing patents,
the lengthy and expensive regulatory approval process and competition from other
products. The Company does not expect to generate revenues from the sale of
proposed products in the foreseeable future.


                                       7
<PAGE>
                             ONYX PHARMACEUTICALS, INC.


RESULTS OF OPERATIONS

THREE MONTHS ENDED MARCH 31, 1999 AND 1998.

REVENUE

The Company's revenues decreased 3% to $3,219,000 for the three months ended
March 31, 1999 as compared to $3,332,000 for the three months ended March 31,
1998.  Revenues for both periods were primarily attributable to amounts earned
for research performed under the Company's collaborations with Warner-Lambert
and Eli Lilly.  Total revenue also included a $1,000,000 license payment from
Warner-Lambert for the inflammation collaboration.  The decrease in revenues for
the three months ended March 31, 1999 as compared to the same period in 1998 is
due primarily to the transition of the ras program with Bayer from research
funding to co-development of a clinical candidate, effective February 1, 1999.  

RESEARCH AND DEVELOPMENT EXPENSES

Research and development expenses decreased 13% to $5,291,000 for the three
months ended March 31, 1999 as compared to $6,065,000 for the three months ended
March 31, 1998.  The decrease was primarily due to a reduced level of research
activities associated with the transition of the ras program.  In addition, the
decrease was also due to the Company currently conducting two Phase I/II
clinical trials of ONYX-015, the lead product in the p53 program, compared to
four clinical trials which were being conducted in the first quarter of 1998. 
The Company may expand the scope of its research and development programs in
future periods, which could result in increased research and development
expenses, including costs associated with clinical development of ONYX-015.
These research and development expenses may not be funded by collaborative
partners. 

GENERAL AND ADMINISTRATIVE EXPENSES

General and administrative expenses for the three months ended March 31, 1999
and 1998 were $1,321,000 and $1,290,000, respectively.  General and
administrative expenses in the first quarter of 1999 showed a modest increase
over the same period in 1998.  

NET INTEREST INCOME

The Company had net interest income of $285,000 and $484,000 for the three
months ended March 31, 1999 and 1998, respectively.  The decrease in net
interest income was principally due to lower cash and investment balances
resulting in less interest income for the current period.

LIQUIDITY AND CAPITAL RESOURCES

Since inception, the Company's cash expenditures have substantially exceeded its
revenues, and the Company has relied primarily on the proceeds from the sale of
equity securities, revenue from collaborative research and development
agreements and bank loans to fund its operations.

The Company's cash, cash equivalents and short-term investments were $26,656,000
at March 31, 1999, compared with $32,160,000 at December 31, 1998. The decrease
in cash and investments of $5,504,000 at March 31, 1999, compared with December
31, 1998, is principally due to cash used in operations of $4,734,000 as well as
the repayment of debt of $550,000.  The Company expects that cash used in
operations 


                                       8
<PAGE>
                             ONYX PHARMACEUTICALS, INC.


will continue at approximately the current rate as research activities and 
clinical development for ONYX-015 progresses.

Total capital expenditures for equipment and leasehold improvements for the
three-month period ended March 31, 1999, were $327,000.  The Company expects to
make expenditures of approximately $1,100,000 for the remainder of 1999 for
capital equipment.  

The Company believes that its existing capital resources, interest thereon, and
anticipated revenues from existing collaborations will be sufficient to fund its
current and planned operations into the year 2000.  There can be no assurance,
however, that changes in the Company's operating expenses will not result in the
expenditure of such resources before such time, and in any event, the Company
will need to raise substantial additional capital to fund its operations in
future periods.

IMPACT OF THE YEAR 2000

Computer programs using two rather than four digits to identify the year in a
date field may cause computer systems to malfunction in the year 2000.  Any
computer programs that have time-related software may determine a date using
"00" as the year 1900 rather than the year 2000. This could result in a system
failure or miscalculations causing disruptions of operations, including, among
other things, a temporary inability to engage in specific business activities.

The Company has appointed a task force comprised of certain members of
management to initiate and monitor a Year 2000 ("Y2K") program.  The Company's
plan to resolve the Y2K issue involves the following three phases: assessment,
implementation of action plans and testing of systems to ensure compliance.  The
Company has completed its assessment phase and has determined that the financial
and information technology systems of the Company are Y2K compliant.  The
Company has also identified certain scientific research and development systems
applications that need to be upgraded or replaced in order to be Y2K compliant. 
The Company intends to upgrade or replace the computer systems, software and
instrumentation that it deems critical to its operation by September 1, 1999. 
There can be no assurance that the Company will be able to upgrade any or all of
its systems in accordance with its Y2K program or, once upgraded, that the
systems will be Y2K compliant.

The Company is gathering information about the Y2K compliance status of its 
significant suppliers and other third parties with which it has 
relationships. The Company is requesting that its outside suppliers and other 
third parties notify the Company in writing of the status of their Y2K 
compliance programs. To date, the Company is not aware of any outside 
supplier or other third party with a Y2K issue that would materially impact 
the Company's business operations. However, there can be no assurance that 
the Company's outside suppliers and other third parties will be successful in 
their Y2K compliance efforts.

The Company believes that its costs associated with the upgrade and/or
conversion of existing computer software and hardware relating to the Y2K issue
will be less than $400,000 based on modifications to date as well as the amount
of scientific research and development equipment that may have to be upgraded.

In the event that the Company does not upgrade its systems in a timely manner,
the Company may encounter problems with the completion of certain scientific
research and development experiments.  The Company does not currently have a
contingency plan in the event that the Company's or its significant suppliers'
systems are not Y2K compliant.



                                       9
<PAGE>
                             ONYX PHARMACEUTICALS, INC.


BUSINESS RISKS

The Company is at an early stage of development.  The development of the
Company's technology and proposed products will require a commitment of
substantial funds to conduct these costly and time-consuming activities.  All of
the Company's potential products are in research or development and will require
significant additional research and development efforts prior to any commercial
use, including extensive preclinical and clinical testing as well as lengthy
regulatory approval.  The development of new products is subject to a number of
significant risks.  Potential products that appear to be promising at an early
stage of development may not reach the market for a number of reasons.  Such
risks include the possibilities that the potential products will be found
ineffective or unduly toxic during clinical trials, fail to receive necessary
regulatory approvals, be difficult to manufacture on a large scale, be
uneconomical to market or be precluded from commercialization by proprietary
rights of third parties.  

The Company is currently engaged in two self-funded Phase I/II clinical trials
of ONYX-015 for the treatment of pancreatic cancer and liver metastases of
colorectal cancer.  The ability of the Company to obtain a corporate partner for
ONYX-015 and to continue its development as a potential product will depend
materially on the results of these and its other completed Phase I and II head
and neck trials.  There is no assurance that such results will be positive or,
even if they are positive, that they will be sufficiently strong to support the
Company's corporate partnering or product development objectives.  

In addition, many of the Company's potential products are subject to development
and licensing arrangements with the Company's collaborators.  Therefore, the
Company is dependent on the research and development efforts of these
collaborators.  Moreover, the Company is entitled to only a portion of the
revenues, if any, realized from the commercial sale of any of the potential
products covered by the collaborations.  Should the Company or its collaborators
fail to perform in accordance with the terms of any of their agreements or
terminate such agreements without cause, any consequent loss of revenue under
the agreements could have a material adverse effect on the Company's results of
operations. 

There can be no assurance that the Company will be able to maintain existing
collaborative agreements, negotiate collaborative arrangements in the future on
acceptable terms, if at all, or that any such collaborative arrangements will be
successful.  To the extent that the Company is not able to maintain or establish
such arrangements, the Company would be required to undertake such activities at
its own expense.

The proposed products under development by the Company have never been
manufactured on a commercial scale, and there can be no assurance that such
products can be manufactured at a cost or in quantities necessary to make them
commercially viable.  The Company has no sales, marketing or distribution
capability.  If any of its products subject to collaborative agreements are
successfully developed, the Company must rely on its collaborators to market
such products.  If the Company develops any products which are not subject to
collaborative agreements, it must either rely on other large pharmaceutical
companies to market such products or must develop a marketing and sales force
with technical expertise and supporting distribution capability in order to
market such products directly.  

The Company intends to seek additional funding through collaborative
arrangements, public or private equity or debt financings, capital lease
transactions or other financing sources that may be available.  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,
substantial dilution to existing stockholders may result.  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 or to obtain funds
through collaborative arrangements with others that 


                                       10
<PAGE>
                             ONYX PHARMACEUTICALS, INC.


are on unfavorable terms or that may require the Company to relinquish rights 
to certain of its technologies, product candidates or products that the 
Company would otherwise seek to develop itself.

The foregoing risks reflect the Company's early stage of development and the
nature of its industry and proposed product.  Also inherent in the Company's
stage of development is a range of additional risks, including competition,
uncertainties regarding protection of patents and proprietary rights, government
regulation and uncertainties regarding health care reform.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The Company's exposure to market rate risk for changes in interest rates 
relates primarily to the Company's investment portfolio. The Company does not 
use derivative financial instruments in its investment portfolio. By policy, 
the Company places its investments with high quality debt security issuers, 
limits the amount of credit exposure to any one issuer, limits duration by 
restricting the term, and holds investments to maturity except under rare 
circumstances. The Company classifies its cash equivalents or short-term 
investments as fixed rate if the rate of return on an instrument remains 
fixed over its term. As of March 31, 1999, all of the Company's cash 
equivalents and short-term investments are classified as fixed rate. There 
were no significant changes in the Company's market risk exposures during the 
three months ended March 31, 1999. For further discussion of the Company's 
market risk exposures, refer to Part II, Item 7A., "Quantitative and 
Qualitative Disclosures About Market Risk" in the Company's Annual Report on 
Form 10-K for the year ended December 31, 1998.


                                       11
<PAGE>
                             ONYX PHARMACEUTICALS, INC.

PART II:  OTHER INFORMATION

ITEM  6.  EXHIBITS AND REPORTS ON FORM 8-K

          a)  EXHIBITS

                    Exhibit 10.24* Amendment to Collaboration Agreement between
                                   Bayer Corporation and the Company dated
                                   February 1, 1999.

                    Exhibit 27.1   Financial Data Schedule

        -----------------
          *  The Company has requested confidential treatment for portions of 
             this exhibit.

     
          b)   REPORTS ON FORM 8-K

                    The Company did not file any reports on Form 8-K during the
                    three months ended March 31, 1999.


                                       12
<PAGE>
                             ONYX PHARMACEUTICALS, INC.


SIGNATURES

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



                         ONYX PHARMACEUTICALS, INC.



Date:  May 17, 1999      By:  /s/ Hollings C. Renton
                              ----------------------
                              Hollings C. Renton
                              President, Chief Executive Officer and Director
                              (Principal Executive and Financial Officer)




Date:  May 17, 1999      By:  /s/ Marilyn E. Wortzman
                              -----------------------
                              Marilyn E. Wortzman
                              Controller 
                              (Principal Accounting Officer)



                                       13
<PAGE>
                         ONYX PHARMACEUTICALS, INC.


EXHIBIT INDEX

<TABLE>
<CAPTION>
                                                                         
                                                                         
Exhibit Number      Description of Exhibits                              
<S>                 <C>                                                 <C>
     10.24*         Amendment to Collaboration Agreement between Bayer
                    Corporation and the Company dated February 1, 1999.

      27.1          Financial Data Schedule                           
</TABLE>
- -----------------
     *  The Company has requested confidential treatment for portions of this
        exhibit.


                                       14

<PAGE>

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

                                                                 EXHIBIT 10.24

                      AMENDMENT TO COLLABORATION AGREEMENT
                                     BETWEEN
                ONYX PHARMACEUTICALS, INC. AND BAYER CORPORATION

         This Amendment to the Collaboration Agreement (the "Second 
Amendment") is dated February 1, 1999 ("the Effective Date of the Second 
Amendment") by and between ONYX PHARMACEUTICALS, Inc., a California 
corporation having its principal place of business in Richmond, California 
("Onyx") and BAYER CORPORATION, an Indiana corporation having its principal 
place of business in Pittsburgh, Pennsylvania ("Bayer"). Bayer and Onyx may 
be referred to herein individually as "Party," or collectively, as the 
"Parties."

                                    RECITALS

         WHEREAS, Onyx and Bayer (under the name Miles Inc., the prior name 
of Bayer) entered into a Collaboration Agreement dated April 22, 1994, as 
amended on April 24, 1996 (the "First Amendment") (such agreement as amended 
by the First Amendment being referred to herein as the "Collaboration 
Agreement"); and

         WHEREAS, in connection with the end of the Research Term, Onyx and 
Bayer desire to amend and modify the terms of the Collaboration Agreement so 
as to: (i) set forth certain understandings regarding the possible 
development of [*]; (ii) more precisely define the aspects of the Parties' 
research following the end of the Research Term which will, and will not, be 
within the scope of the Collaboration Agreement; and (iii) more precisely 
define Onyx' remaining Research obligations during the balance of the 
Research Term;

         NOW THEREFORE, in consideration of the covenants contained in this 
Amendment, the Parties agree as follows:

         1.   CAPITALIZED  TERMS PREVIOUSLY  DEFINED. Capitalized terms used 
but not defined herein shall have the same meanings given to them in the 
Collaboration Agreement.

         2.   AMENDMENT OF DEFINED TERM: COLLABORATION COMPOUND. Section 1.9 
of the Collaboration Agreement is hereby amended to read in its entirety as 
follows:

              1.9 "COLLABORATION COMPOUND" means, except as provided below,
         any composition of matter that is discovered, identified or synthesized
         by or on behalf of Onyx or Bayer or an Affiliate of either of them, and
         is recognized for its activity for inhibiting the activity of a target
         within the Residual Field of Collaborative Research prior to the date
         which is the earlier of (a) the date such target is removed from the
         Residual Field of Collaborative Research pursuant to Section 12 below,
         or (b) the first anniversary of the end of the Research Term.


                                      1.
<PAGE>


         As used herein, the activity of a composition of matter for 
inhibiting a target within the Residual Field of Collaborative Research will 
be "recognized" if it satisfies that standard for a ras positive set forth in 
Exhibit D, or other specific activity in a particular assay or assays within 
the Residual Field of Collaborative Research established by the JRDC from 
time to time pursuant to Section 6.3.

         Notwithstanding the foregoing, the term "Collaboration Compound" 
shall not include:

                   (a) any composition of matter marketed by Bayer 
         or an Affiliate of Bayer as of April 22, 1994 or as to which Bayer 
         or an Affiliate of Bayer is conducting human clinical trials or 
         have approved the commencement of preclinical development (as 
         determined by the appropriate committee of Bayer or an Affiliate of 
         Bayer), as of April 22, 1994; or

                   (b) any composition of matter owned by Bayer or 
         Onyx or an Affiliate of either of them that could become subject to 
         this Agreement by reason of an expansion of the Field of 
         Collaborative Research after April 22, 1994 but as to which 
         marketing rights have been granted to a Third Party prior to such 
         expansion; or

                   (c) any composition of matter that is a Back-Up 
         Compound after [*] years following the end of the Research Term. 
         Rights in such compounds after such [*] year period shall be 
         allocated as set forth on Exhibit A(3).

         3.   AMENDMENT OF DEFINED TERM: POST-COLLABORATION COMPOUND. Section 
1.39 of the Collaboration Agreement is hereby amended to read in its entirety 
as follows:

              1.39   "POST-COLLABORATION COMPOUND" means any composition of
         matter synthesized, identified or discovered by Onyx or Bayer:

                  (a) that is contained within a chemical genus as defined 
         in any pending or issued claim of any unexpired Bayer Patent or 
         Onyx Patent filed in the United States, the United Kingdom, France, 
         or Germany or in the European Patent Office and as to which at 
         least one member of such chemical genus is a Collaboration 
         Compound, and

                   (b) that is recognized for its activity in inhibiting a 
         target within the Residual Field of the Collaborative Research, as 
         defined in Section 1.55, by Onyx or Bayer during the [*] year 
         period after the end of the Research Term, pursuant to Section 
         9.6(d) (at a royalty rate pursuant to Section 16.6).

         4.   ADDITIONAL DEFINED TERM. The Collaboration Agreement is hereby 
amended to add the following additional defined term:

              1.55   "RESIDUAL FIELD OF COLLABORATIVE RESEARCH" means, subject
         to Section 12 of the Second Amendment, the following targets: (i) [*],
         (ii) [*]; (iii) [*]; (iv) [*]; (v) [*]; and (vi) those targets, if any,
         from the [*] Project which the JRDC designates during the [*] following
         the end of the Research Term as being within the Residual Field of
         Collaborative Research.


[*] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY 
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND 
EXCHANGE COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 
1934, AS AMENDED.

                                      2.
<PAGE>


         5.   ADDITIONAL DEFINED TERM. The Collaboration Agreement is hereby 
amended to add the following additional defined term:

              1.56   "[*] PROJECT" means the project underway as of the
         Effective Date of the Second Amendment, between Onyx and [*] to
         identify [*] is specifically [*] in response to the presence of an [*]
         in human tissue culture cell lines as determined under [*] conditions.
         Such cell lines shall include the [*] cell lines [*] cell line) and [*]
         cell line). In this project, these [*] are being compared to those
         obtained from analysis of the [*] cell lines. This project will be
         limited to the identity of those [*] represented on the [*], available
         from [*].

         6.   DESIGNATION OF [*]. Onyx shall provide to the JRDC the data 
obtained from the [*] Project, including the list of [*] whose [*] is [*] 
under the specified conditions, promptly following receipt of such data by 
Onyx. Within thirty (30) days following such delivery of data, the JRDC shall 
meet to designate which of such [*], if any, shall be included within the 
Residual Field of Collaborative Research. If the JRDC elects to include any 
[*] studied in the [*] Project within the Residual Field of Collaborative 
Research, it shall also define a program of follow-up research activities by 
the Parties to pursue such [*] of interest. Whether or not the JRDC elects to 
include within the Residual Field of Collaborative Research any of the [*] 
studied in the course of the [*] Project, Onyx and Bayer shall each own an 
undivided one-half interest in the data obtained from the [*] Project, and 
each Party shall be entitled to conduct work related to such [*] and 
commercialize resulting products without obligation to the other, unless the 
resulting products contain Collaboration Compounds or Post-Collaboration 
Compounds.

         7.   AMENDMENT TO PARAGRAPH 9.6(d). Paragraph 9.6(d) is amended to 
change the last phrase of the last sentence in the paragraph from "shall be 
done by Onyx" to "may be done by either Party."

         8.   [*] COLLABORATION COMPOUNDS. Onyx and Bayer agree that any and 
all [*]Collaboration Compounds that are designated by the JRDC as Development 
Compounds for Co-Development shall be treated for purposes of the 
Collaboration Agreement as having been so designated prior to the end of the 
Research Term pursuant to Section 11.4 of the Collaboration Agreement, 
regardless of when such [*]Collaboration Compounds are designated Development 
Compounds for Co-Development. Onyx and Bayer further agree that any [*] 
Collaboration Compounds selected by the JRDC as Back-Up Compounds shall be 
treated as having been so designated prior to the end of the Research Term 
pursuant to Section 11.4 of the Collaboration Agreement, regardless of when 
such [*] Collaboration Compounds are selected as Back-Up Compounds.

         9.   DEVELOPMENT GUIDELINES. In order to insure that both Parties 
have every incentive to invest in the success of the joint effort 
contemplated by this Agreement, the Parties agree as follows:

                   (a) In the event the JRDC designates a [*] Collaboration 
         Compound as a Development Compound prior to June 30, 1999, the 
         Parties agree that so long as Onyx and Bayer are engaged in 
         Co-Development or Bayer is engaged in development of at least one 
         [*] Development Compound with Bayer diligently pursuing or 
         participating in


[*] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY 
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND 
EXCHANGE COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 
1934, AS AMENDED.

                                      3.
<PAGE>


         pursuit of development activities to obtain marketing approval, or 
         Bayer is marketing a Product containing such a Development 
         Compound, then Bayer shall not be obligated to [*] more than [*] 
         Development Compound at any one time, and Onyx shall not pursue [*]
         under the Agreement, including but not limited to Paragraphs 7.3, 
         9.6, or Article 12 with respect to [*].

                   (b) If the JRDC at any time in the future designates one 
         or more additional Collaboration Compounds as Development 
         Compounds, and Bayer agrees that such compound(s) will be treated 
         for purposes of the Collaboration Agreement as if they had been 
         designated for Co-Development prior to the end of the Research 
         Term, and provided Onyx has not at the time of such JRDC 
         designation and Bayer agreement already commenced development of a 
         compound directed against the molecular target in question, the 
         Parties agree that so long as Onyx and Bayer are engaged in 
         Co-Development or Bayer is engaged in development of [*] with Bayer 
         diligently pursuing or participating in pursuit of development 
         activities to obtain marketing approval, or Bayer is marketing a 
         Product containing such a Development Compound, then Bayer shall 
         not be obligated to [*] more than [*] at any one time, and Onyx 
         shall not pursue [*] under the Agreement, including but not limited 
         to Paragraphs 7.3, 9.6, or Article 12 with respect to that target. 
         In the event a compound is active against two (2) or more targets 
         contained in the Residual Field of Collaborative Research, the 
         development of said compound with respect to one (1) of said 
         targets will satisfy the requirements of this paragraph with 
         respect to all of such targets.

         10.  ACQUISITION OF COMPOUNDS FROM [*]. During the Research Term, 
the Parties evaluated for possible acquisition under the Agreement a compound 
in the field of [*] owned by [*]. Onyx agrees that it will not participate 
further in the acquisition or development of this compound, Bayer is free to 
enter into an agreement with [*] for the development of one or more 
compound(s) in the field of [*].

         11.  ONYX' AND BAYER'S RIGHTS TO CONDUCT INDEPENDENT DISCOVERY. 
Commencing February 1, 1999, each of Onyx and Bayer shall have the right to 
engage in the independent discovery of inhibitors of Ras Function independent 
of the other Party outside the Residual Field of Collaborative Research. 
Commencing on such date, any compositions of matter discovered by either 
Party that inhibit Ras Function outside the Residual Field of Collaborative 
Research shall be outside the scope of the Collaboration Agreement, unless 
such compositions of matter fall within the definition of Collaboration 
Compounds or Post-Collaboration Compounds with respect to the Residual Field 
of Collaborative Research. No licenses are granted for such independent 
discovery activities except as set forth in Article 4 of the Collaboration 
Agreement.

         12.  TARGETS REMOVED FROM THE RESIDUAL FIELD OF COLLABORATIVE 
RESEARCH. Individual targets contained within the Residual Field of 
Collaborative Research as of the Effective Date of the Second Amendment 
("Residual Targets") shall be removed from the Residual Field of 
Collaborative Research if, on or before August 1, 1999, such targets are 
screened against a representative set of Bayer compounds and, on the basis of 
the results of such screening, thc JRDC determines (with the concurrence of 
representatives of both Parties) that such results do not justify the 
designation of a strategic Analoging Program related to such Residual Target.


[*] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY 
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND 
EXCHANGE COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 
1934, AS AMENDED.

                                      4.
<PAGE>


         13.  REMAINING ONYX RESEARCH OBLIGATIONS. Pursuant to the Research 
Program, Onyx shall provide to Bayer, as soon as practicable after the 
Effective Date of the Second Amendment, the new assays and materials outlined 
on Exhibit E to this Amendment (to the extent not already delivered to 
Bayer). Within thirty (30) days after such delivery Bayer will pay Onyx any 
final payment due in support of the research under thc Research Term. Onyx 
shall be [*] to provide or account for a specific number of [*] under the 
Collaboration Agreement during the last [*] of the Research Term.

         14.  NEW NAME AND ADDRESS FOR NOTICE FOR BAYER CORPORATION. In 
Paragraph 28.7, "Notices", the name and address for notice to Bayer is 
amended to read as follows:

              BAYER CORPORATION
              Pharmaceutical Division
              400 Morgan Lane
              West Haven, CT 06516
              Attention:  VP, Law & Patents
              Telephone:  (203) 812-2401
              Telecopy:   (203) 812-2795

         with a copy to Jones, Day, Reavis & Pogue as previously set forth.

         15.  FULL FORCE AND EFFECT OF AGREEMENT. The Collaboration 
Agreement, as modified by the First Amendment and Second Amendment, 
constitutes the entire agreement of the Parties on the subject matter hereof. 
The Collaboration Agreement, as modified hereby, remains in full force and 
effect.

<TABLE>
<CAPTION>
- ------------------------------------------------------------ ---------------------------------------------------------
ONYX PHARMACEUTICALS, INC.                                   BAYER CORPORATION
- ------------------------------------------------------------ ---------------------------------------------------------
<S>                                                          <C>
By:  /s/   Hollings C. Renton                                By:    /s/   Michael J. Berendt
     ------------------------------------------------             ------------------------------------------------
- ------------------------------------------------------------ ---------------------------------------------------------
Name:  Hollings C. Renton                                    Name:  Michael J. Berendt, Ph.D.
- ------------------------------------------------------------ ---------------------------------------------------------
Title:  President and Chief Executive Officer                Title:  Sr. VP, Pharmaceutical Research
- ------------------------------------------------------------ ---------------------------------------------------------
Date:  February 10, 1999                                     Date:  March 1, 1999
- ------------------------------------------------------------ ---------------------------------------------------------
</TABLE>


[*] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY 
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND 
EXCHANGE COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 
1934, AS AMENDED.

                                      5.
<PAGE>


                                    EXHIBIT E

                              ASSAYS AND MATERIALS
                        TO BE DELIVERED TO BAYER BY ONYX

[*] Assay

[*] Assay

[*] Assay

[*] Assay

[*] Assay

Results of [*] Project


[*] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY 
BRACKETS, HAS BEEN OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND 
EXCHANGE COMMISSION PURSUANT TO RULE 24b-2 OF THE SECURITIES EXCHANGE ACT OF 
1934, AS AMENDED.

                                      6.

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM ONYX
PHARMACEUTICALS, INC.'S UNAUDITED CONDENSED BALANCE SHEET DATED MARCH 31, 1999,
AND UNAUDITED CONDENSED STATEMENT OF OPERATIONS FOR THE THREE MONTHS ENDED MARCH
31, 1999, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               MAR-31-1999
<CASH>                                          16,146
<SECURITIES>                                    10,510
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                27,242
<PP&E>                                          11,639
<DEPRECIATION>                                   8,145
<TOTAL-ASSETS>                                  31,306
<CURRENT-LIABILITIES>                           10,888
<BONDS>                                          4,031
                                0
                                          0
<COMMON>                                            11
<OTHER-SE>                                      18,568
<TOTAL-LIABILITY-AND-EQUITY>                    31,306
<SALES>                                              0
<TOTAL-REVENUES>                                 3,219
<CGS>                                                0
<TOTAL-COSTS>                                    6,612
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  94
<INCOME-PRETAX>                                (3,108)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (3,108)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (3,108)
<EPS-PRIMARY>                                   (0.27)
<EPS-DILUTED>                                   (0.27)
        

</TABLE>


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