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 September 30, 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.

                  (XX)   Yes                                  (   )   No

The number of outstanding shares of the registrant's Common Stock, $0.001 par
value, was 11,532,574 as of November 1, 1999.



                            ONYX PHARMACEUTICALS, INC.

                                      INDEX

PART I:  FINANCIAL INFORMATION



                                                                                           PAGE
                                                                                     
ITEM 1.           Financial Statements

                  Condensed Balance Sheets - September 30, 1999 and
                  December 31, 1998                                                          3

                  Condensed Statements of Operations - Three and Nine Months
                  Ended September 30, 1999 and 1998                                          4

                  Condensed Statements of Cash Flows - Nine Months ended
                  September 30, 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                10


PART II:  OTHER INFORMATION

ITEM 6.           Exhibits and Reports on Form 8-K                                          11

SIGNATURES                                                                                  12

EXHIBIT INDEX                                                                               13



                                      2


                            ONYX PHARMACEUTICALS, INC.

PART I:  FINANCIAL INFORMATION

ITEM 1:  FINANCIAL STATEMENTS

                                              CONDENSED BALANCE SHEETS
                                          (In thousands, except share data)


                                                                              September 30,        December 31,
                                                                                   1999                1998
                                                                            -----------------    ----------------
                                                                               (Unaudited)           (Note 1)
                                                                                           
                                  ASSETS

     Current assets:

         Cash and cash equivalents                                                 $  11,780           $  21,368
         Short-term investments                                                        3,061              10,792
         Other current assets                                                            705                 609
                                                                            -----------------    ----------------
              Total current assets                                                    15,546              32,769

     Property and equipment, net                                                       3,163               3,730
     Notes receivable from related parties                                               427                 649
     Other assets                                                                         32                  59
                                                                            -----------------    ----------------
                                                                                   $  19,168           $  37,207
                                                                            =================    ================

                       LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:

         Accounts payable                                                           $  1,644            $  2,371
         Accrued liabilities                                                           1,867               2,456
         Accrued clinical trials and related expenses                                    999               2,176
         Accrued compensation                                                            764                 658
         Deferred revenue                                                              2,085               3,318
         Long-term debt, current portion                                               2,199               2,199
                                                                            -----------------    ----------------
              Total current liabilities                                                9,558              13,178

     Long-term debt, noncurrent portion                                                  732               2,382
     Deferred rent                                                                         -                  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;
     11,532,574 and 11,452,457 shares issued and outstanding as of
     September 30, 1999 and December 31, 1998, respectively                               12                  11
     Additional paid-in capital                                                       85,321              85,073
     Deferred compensation                                                               (29)               (194)
     Accumulated deficit                                                             (76,426)            (63,271)
                                                                            -----------------    ----------------
              Total stockholders' equity                                               8,878              21,619
                                                                            -----------------    ----------------
                                                                                   $  19,168           $  37,207
                                                                            =================    ================


                             See accompanying notes.

                                      3


                                             ONYX PHARMACEUTICALS, INC.

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


                                                                  Three Months Ended               Nine Months Ended
                                                                     September 30,                   September 30,
                                                             -----------------------------   --------------------------------
                                                                  1999            1998            1999             1998
                                                             -------------   -------------   -------------   ----------------
                                                                                                 
Revenue:

       Contract and other revenue                                 $   290          $  479         $ 1,292         $   1,274
       Contract revenue from related parties                        1,406           2,183           5,431             7,301
                                                             -------------   -------------   -------------   ---------------
Total revenue                                                       1,696           2,662           6,723             8,575

Operating expenses:

       Research and development                                     5,422           6,625          16,548            19,309
       General and administrative                                   1,240           1,331           4,001             3,941
                                                             -------------   -------------   -------------   ---------------
Total operating expenses                                            6,662           7,956          20,549            23,250
                                                             -------------   -------------   -------------   ---------------

Loss from operations                                               (4,966)         (5,294)        (13,826)          (14,675)

Interest income, net                                                  168             408             671             1,342
                                                             -------------   -------------   -------------   ---------------

Net loss                                                         $(4,798)        $(4,886)       $(13,155)         $(13,333)
                                                             =============   =============   =============   ===============

Basic and diluted net loss per share                             $ (0.42)        $ (0.43)        $ (1.14)          $ (1.19)
                                                             =============   =============   =============   ===============

Shares used in computing basic and diluted net loss per
share                                                              11,525          11,372          11,492            11,243
                                                             =============   =============   =============   ===============


                             See accompanying notes.

                                      4


                            ONYX PHARMACEUTICALS, INC.

                        CONDENSED STATEMENTS OF CASH FLOW
                                 (In thousands)
                                   (Unaudited)


                                                                                          Nine Months Ended
                                                                                            September 30,
                                                                                  --------------------------------
                                                                                        1999             1998
                                                                                  --------------    --------------
                                                                                              
CASH FLOWS FROM OPERATING ACTIVITIES:

  Net loss                                                                         $ (13,155)       $ (13,333)
  Adjustments to reconcile net loss to net cash used in operating
     activities:
  Depreciation and amortization                                                        1,601            1,295
  Forgiveness of notes receivable                                                         72               89
  Amortization of deferred compensation                                                  165              164
  Loss on disposals of fixed assets                                                       23                -
  Changes in assets and liabilities:
      Other current assets                                                               (96)              42
      Other assets                                                                        27              (28)
      Accounts payable                                                                  (727)             (43)
      Accrued clinical trials and related expenses                                    (1,177)             648
      Accrued liabilities                                                               (589)           1,267
      Accrued compensation                                                               106              230
      Deferred revenue                                                                (1,233)             892
      Deferred rent                                                                      (28)             (62)
                                                                               --------------   --------------
        Net cash used in operating activities                                        (15,011)          (8,839)
                                                                               --------------   --------------
CASH FLOWS FROM INVESTING ACTIVITIES:

  Purchases of short-term investments                                                 (2,045)         (11,308)
  Sales and maturities of short-term investments                                       9,776           15,344
  Capital expenditures                                                                (1,106)            (544)
  Notes receivable from related parties                                                  150              (16)
  Proceeds from sale of fixed assets                                                      49               35
                                                                               --------------   --------------
        Net cash provided by investing activities                                      6,824            3,511
                                                                               --------------   --------------
CASH FLOWS FROM FINANCING ACTIVITIES:

  Payments on long-term debt                                                          (1,650)          (1,335)
  Net proceeds from issuances of common stock, net of repurchases                        249           10,098
                                                                               --------------   --------------
        Net cash provided by (used in) financing activities                           (1,401)           8,763
                                                                               --------------   --------------
  Net increase (decrease) in cash and cash equivalents                                (9,588)           3,435
  Cash and cash equivalents at beginning of period                                    21,368           18,828
                                                                               --------------   --------------
  Cash and cash equivalents at end of period                                         $11,780          $22,263
                                                                               ==============   ==============


                             See accompanying notes.

                                      5


                            ONYX PHARMACEUTICALS, INC.

                     NOTES TO CONDENSED FINANCIAL STATEMENTS
                               SEPTEMBER 30, 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-month and nine-month periods ended September 30, 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

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. For the
three-month and nine-month periods ended September 30, 1999, total comprehensive
loss approximated net loss.

NOTE 3.  SUBSEQUENT EVENTS

On October 18, 1999, the Company announced the signing of a collaboration
agreement with Warner-Lambert Company ("Warner-Lambert") to jointly develop
and commercialize ONYX-015 plus two new armed anticancer viruses. As part of
that agreement, Warner-Lambert will make an up-front payment and equity
investments in the Company over the next two years totaling $15,000,000.
Warner-Lambert is also providing the first $40,000,000 in funding for Phase
III clinical studies of ONYX-015 and is additionally funding research and
development of the two new armed viruses. In addition to the committed
funding, over $100,000,000 could be payable to Onyx on the achievement of
milestones for the products.

                                      6


                            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

Onyx Pharmaceuticals Inc. (the "Company" or "Onyx") is discovering, developing
and commercializing novel cancer therapies based on the genetic mutations that
cause the disease. The Company pursues a strategy of establishing corporate
partnerships that provide complementary skills in chemistry, drug development,
and marketing and sales.

The Company is engaged in an ongoing collaboration with Bayer Corporation
("Bayer") in the area of ras oncogenes, in which a clinical development
candidate has been named. The focus of the collaboration is now on
co-development of this clinical candidate. The Company has also entered into
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. Subsequent to the quarter
ended September 30, 1999, the Company announced the signing of a third
collaboration agreement with Warmer-Lambert to jointly develop and
commercialize ONYX-015 plus two new armed anticancer viruses.

The Company has not been profitable since inception and expects to incur
substantial losses for the foreseeable future, primarily due to its self-funded
virus research program. The Company expects that losses will fluctuate from
quarter to quarter and that such fluctuations may be substantial. As of
September 30, 1999, the Company's accumulated deficit was $76,426,000.

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.

RESULTS OF OPERATIONS

THREE AND NINE MONTHS ENDED SEPTEMBER 30, 1999 AND 1998.

REVENUES

The Company's revenues decreased 36 percent to $1,696,000 and 22 percent to
$6,723,000 for the three and nine months ended September 30, 1999, respectively,
as compared to the same periods in 1998. Revenues for the 1998 periods were
$2,662,000 and $8,575,000 respectively. Revenues for the three and nine months
ended September 30, 1999 were primarily attributable to amounts earned for
research performed under the Company's collaborations with Warner-Lambert for
the cell cycle and inflammation programs. The decrease in revenues for the three
and nine months ended September 30, 1999 as compared to the same periods 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.


                                      7


                            ONYX PHARMACEUTICALS, INC.

RESEARCH AND DEVELOPMENT EXPENSES

Research and development expenses decreased 18 percent to $5,422,000 and 14
percent to $16,548,000 for the three and nine months ended September 30, 1999,
respectively, as compared with $6,625,000 and $19,309,000 for the same periods
in 1998. The decrease in expenses for the three and nine months ended September
30, 1999 as compared to the same periods in 1998 was primarily due to a reduced
level of research activities associated with the transition of the ras program.
The decrease was also due to the fact that the Company has reduced the number of
patients treated in clinical trials of ONYX-015, the lead product in the p53
program, while it prepares for Phase III clinical studies for the product. The
Company may expand the scope of its research and development programs in future
periods, which may result in increased research and development expenses. These
research and development expenses may not be funded by collaborative partners.

GENERAL AND ADMINISTRATIVE EXPENSES

General and administrative expenses decreased seven percent to $1,240,000 and
increased two percent to $4,001,000 for the three and nine months ended
September 30, 1999, respectively, as compared with $1,331,000 and $3,941,000 for
the same periods in 1998. Although general and administrative expenses remained
relatively stable as compared to the prior periods, they may increase moderately
in future periods to support the Company's research and development efforts.

NET INTEREST INCOME

The Company had net interest income of $168,000 and $671,000 for the three and
nine months ended September 30, 1999, respectively, as compared with $408,000
and $1,342,000 for the same periods in 1998. 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 $14,841,000
at September 30, 1999, compared with $32,160,000 at December 31, 1998. The
decrease in cash and investments of $17,319,000 at September 30, 1999, compared
with December 31, 1998, is principally due to cash used in operations of
$15,011,000 as well as the repayment of debt of $1,650,000. The Company expects
that cash used in operations will be approximately one-half the current rate
because of funds provided by the new Warner-Lambert collaboration.

Total capital expenditures for equipment and leasehold improvements for the
nine-month period ended September 30, 1999 were $1,106,000. The Company expects
to make expenditures of approximately $275,000 for the remainder of 1999 for
capital equipment.

The Company believes that its existing capital resources, interest thereon, and
anticipated revenues from existing collaborations, including the new
Warner-Lambert collaboration, will be sufficient to fund its current and planned
operations to the end of 2001. 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.

                                      8


                            ONYX PHARMACEUTICALS, INC.

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 believes it has upgraded or replaced the computer systems, software
and instrumentation that it deems critical to its operation. 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.

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.

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

                                      9


                            ONYX PHARMACEUTICALS, INC.

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.
In addition, the Company would be required to undertake such research and
development activities at its own expense. 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.

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 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
September 30, 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 nine months ended September 30,
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.

                                      10


                            ONYX PHARMACEUTICALS, INC.

PART II:  OTHER INFORMATION

ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

     a)  Exhibits

             Exhibit 10.25    Scientific Advisory Board Consulting Agreement
                              effective September 10, 1999 between Allan Balmain
                              and the Company including the First Amendment to
                              Deed of Trust and Second Amended and Restated
                              Promissory Note

             Exhibit 27.1     Financial Data Schedule

     b)  Reports on Form 8-K

             No reports on Form 8-K were filed during the period covered by
this report.

                                      11


                            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:  November 15, 1999       By:  /S/ HOLLINGS C. RENTON
                               --------------------------------
                               Hollings C. Renton
                               President, Chief Executive Officer and Director
                               (Principal Executive and Financial Officer)



Date:  November 15, 1999       By:  /S/ MARILYN E. WORTZMAN
                               ---------------------------------
                               Marilyn E. Wortzman
                               Controller
                               (Principal Accounting Officer)



                                      12


                            ONYX PHARMACEUTICALS, INC.

EXHIBIT INDEX



EXHIBIT NUMBER  DESCRIPTION OF EXHIBITS
             
        10.25   Scientific Advisory Board Consulting Agreement effective
                September 10, 1999 between Allan Balmain and the Company
                including the First Amendment to Deed of Trust and Second
                Amended and Restated Promissory Note

        27.1    Financial Data Schedule



                                      13