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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    ---------

                                   Form 10-K/A
                                (Amendment No. 2)

(MARK ONE)

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

                   For the fiscal year ended: December 31,2001

                                       or

[_]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934

                         Commission file number: 0-10824

                            Genome Therapeutics Corp.
             (Exact name of registrant as specified in its charter)


                                                      
                 Massachusetts                                        04-2297484
(State or other jurisdiction of incorporation or         (IRS employer identification number)
                 organization)

   100 Beaver Street, Waltham, Massachusetts                            02453
    (Address of principal executive offices)                          (Zip Code)


                  Registrant's telephone number: (781) 398-2300

        Securities registered pursuant to Section 12(b) of the Act: NONE

           Securities registered pursuant to Section 12(g) of the Act:
                          COMMON STOCK, $.10 PAR VALUE
                                (Title of Class)

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

     Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [X]

     The aggregate market value of the voting stock held by non-affiliates of
the registrant as of November 8, 2002 was approximately $37,795,944.

     The number of shares outstanding of the registrant's common stock as of
November 8, 2002 was 23,066,072.

                       Documents Incorporated By Reference

     Portions of the registrant's proxy statement for use at its Annual Meeting
to be held on June 19, 2002 are incorporated by reference into Part III.

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Introductory Note

This Annual Report on Form 10-K/A replaces Exhibit 10.61 of Form 10-K filed on
April 1, 2002.

                                        1



                                     PART IV

ITEM 14.  Exhibits, Financial Statement Schedules and Reports on Form 8K

     (a) FINANCIAL STATEMENTS AND FINANCIAL STATEMENT SCHEDULES (1) AND (2) See
"Index to Consolidated Financial Statements and Financial Statement Schedules"
appearing on page F-1.

     (3) Exhibits


Exhibit
  No.     Description
-------   ----------------------------------------------------------------------
  3       Restated Articles of Organization and By-laws/(1)/
  3.1     Amendment dated January 5, 1982 to Restated Articles of
          Organization/(2)/
  3.2     Amendment dated January 24, 1983 to Restated Articles of
          Organization/(3)/
  3.3     Amendment dated January 17, 1984 to Restated Articles of
          Organization/(4)/
  3.4     Amendment dated October 20, 1987 to the By-laws/(8)/
  3.5     Amendment dated December 9, 1987 to Restated Articles of
          Organization/(9)/
  3.6     Amendment dated October 16, 1989 to the By-law/(11)/
  3.7     Amendment dated January 24, 1994 to Articles Restated Articles of
          Organization/(14)/
  3.8     Amendment dated August 31, 1994 to Restated Articles of
          Organization/(14)/
  3.9     Amendment dated March 15, 2001 to Restated Articles of
          Organization/(33)/
  3.10    By-Laws of Genome Therapeutics Corp (as amended through July 24,
          2001)/(34)/
  4.2     Form of Note dated March 5, 2002 received by Smithfield Fiduciary LLC
          and the Tail Wind Fund, Ltd./(35)/
  4.3     Form of Warrant received by Smithfield Fiduciary LLC and The Tail Wind
          Fund, Ltd./(35)/
  10.4    Incentive Stock Option Plan and Form of Stock Option Certificate/(1)/
  10.6    Genome Therapeutics Corp. (f/k/a Collaborative Research) Incentive
          Savings Plan/(6)/
  10.7    Amendment dated November 4, 1986 to the Genome Therapeutics Corp.
          (f/k/a Collaborative Research) Incentive Savings Plan dated March 1,
          1985/(7)/
  10.14   1991 Stock Option Plan and Form of Stock Option Certificate/(12)/
  10.15   Lease dated November 17, 1992 relating to certain property in Waltham,
          Massachusetts/(13)/
  10.16   Lease dated June 3, 1993 relating to certain property in Waltham,
          Massachusetts/(13)/
  10.19   Employment Agreement with Robert J. Hennessey/(13)/
  10.22   Lease Amendment dated August 1, 1994 relating to certain property in
          Waltham, MA/(14)/
  10.24   1993 Stock Option Plan and Form of Stock Option Certificate/(14)/
  10.28   Agreement between the Company and AstraZeneca PLC (f/k/a Astra Hassle
          AB) dated August 31, 1995/(16)/*
  10.29   Collaboration and License Agreement between the Company, Schering
          Corporation and Schering-Plough Ltd., dated as of December 6,
          1995/(18)/*
  10.30   Form of director Stock Option Agreement and schedule of director
          options granted/(17)/

                                        1



Exhibit
  No.     Description
-------   ----------------------------------------------------------------------

10.37     Lease amendment dated November 15, 1996 to certain property in
          Waltham, MA/(19)/
10.38     Collaboration and License Agreement between the Company, Schering
          Corporation and Schering-Plough Ltd., dated as of December 20,
          1996/(20)/*
10.39     Credit agreement between the Company and Fleet National Bank dated
          February 28, 1997/(21)/
10.40     Credit agreement between the Company and U S Trust (f/k/a Sumitomo
          Bank, Limited) dated July 31, 1997/(22)/
10.41     Collaboration and License Agreement between the Company and Schering
          Corporation, dated September 22, 1997/(23)/*
10.42     Collaboration and License Agreement between the Company and
          Schering-Plough Ltd. dated September 22, 1997/(23)/*
10.43     Credit modification agreement between the Company and Fleet National
          Bank, dated March 9, 1998/(24)/
10.44     1997 Directors' Deferred Stock Plan/(25)/
10.45     1997 Stock Option Plan/(25)/
10.46     Amended Employment Agreement with Robert J. Hennessey/(26)/
10.47     Collaboration and License Agreement between the Company and American
          Home Products, Inc., acting through its Wyeth-Ayerst Division, dated
          December 20, 1999/(27)/
10.49     Collaboration and License Agreement between Genome Therapeutics
          Corporation and bioMerieux Incorporated dated as of September 30,
          1999/(29)/
10.50     Registration Rights Agreement between the Company and bioMerieux
          Alliance sa dated September 30, 1999/(30)/
10.51     Compound Discovery Collaboration Agreement, dated October 17, 2000
          between the Company and ArQule, Inc./(31)/*
10.52     2001 Incentive Plan/(32)/
10.53     Stock Option Agreements with Steven M. Rauscher/(32)/
10.55     Employment Letter with Steven M. Rauscher/(34)/
10.56     Employment Letter with Stephen Cohen/(34)/
10.57     Employment Letter with Richard Labaudinere PhD/(34)/
10.58     Purchase Agreement dated March 5, 2002 among Smithfield Fiduciary LLC,
          The Tail Wind Fund, Ltd. and the Company/(35)/
10.59     Registration Rights Agreement dated March 5, 2002 among Smithfield
          Fiduciary LLC, The Tail Wind Fund, Ltd. and the Company/(35)/
10.60     Employment Letter with Robert J. Hennessey/(36)/
10.61     License and Supply Agreement between the Company and Biosearch Italia,
          S.P.A., dated October 8, 2001/(38)/*
23.       Consent of Arthur Andersen LLP Independent Public Accounts/(37)/
99.1      Risk Factors/(36)/
99.2      Letter to Commission Pursuant to Temporary Note 3T/(37)/

----------
      * Confidential treatment requested with respect to a portion of this
Exhibit.

/(1)/   Filed as exhibits to the Company's Registration Statement on Form S-1
        (No. 2-75230) and incorporated herein by reference.
/(2)/   Filed as an exhibit to the Company's Quarterly Report on Form 10-Q for
        the quarter ended February 27, 1982 and incorporated herein by
        reference.
/(3)/   Filed as exhibits to the Company's Quarterly Report on Form 10-Q for the
        quarter ended February 26, 1983 and incorporated herein by reference.
/(4)/   Filed as an exhibit to the Company's Quarterly Report on Form 10-Q for
        the quarter ended February 25, 1984 and incorporated herein by
        reference.
/(6)/   Filed as an exhibit to the Company's Annual Report on Form 10-K for the
        fiscal year ended August 31, 1985 and incorporated herein by reference.
/(7)/   Filed as exhibits to the Company's Annual Report on Form 10-K for the
        fiscal year ended August 31, 1986 and incorporated herein by reference.

                                        2



/(8)/     Filed as an exhibit to the Company's Annual Report on Form 10-K for
          the year ended August 31, 1987 and incorporated herein by reference.
/(9)/     Filed as an exhibit to the Company's Quarterly Report on Form 10-Q for
          the quarter ended November 28, 1987 and incorporated herein by
          reference.
/(11)/    Filed as an exhibit to the Company's Annual Report on Form 10-K for
          the fiscal year ended August 31, 1989 and incorporated herein by
          reference.
/(12)/    Filed as an exhibit to the Company's Annual Report on Form 10-K for
          the fiscal year ended August 31, 1992 and incorporated herein by
          reference.
/(13)/    Filed as exhibits to the Company's Annual Report on Form 10-K for the
          fiscal year ended August 31, 1993 and incorporated herein by
          reference.
/(14)/    Filed as exhibits of the Company's Annual Report on Form 10-K for the
          fiscal year ended August 31, 1994 and incorporated herein by
          reference.
/(16)/    Filed as an exhibit to the Company's Annual Report on Form 10-K/A3 for
          the year ended August 31, 1995 and incorporated herein by reference.
/(17)/    Filed as an exhibit to the Company Registration Statement on Forms S-8
          (File No. 33-61191) and incorporated herein by reference.
/(18)/    Filed as an exhibit to the Company's Quarterly Report on Form 10-Q for
          the quarter ended November 25, 1995 and incorporated herein by
          reference.
/(19)/    Filed as an exhibit to the Company's 10-K for fiscal year ended August
          31, 1996 and incorporated herein by reference.
/(20)/    Filed as an exhibit to the Company's 10-Q/A for the quarter ended
          March 1, 1997 and incorporated herein by reference.
/(21)/    Filed as an exhibit to the Company's 10-Q for the quarter ended May
          31, 1997 and incorporated herein by reference.
/(22)/    Filed as an exhibit to the Company's 10-K for fiscal year ended August
          31, 1997 and incorporated herein by reference.
/(23)/    Filed as exhibits to the Company's 10-Q for the quarter ended February
          28, 1998 and incorporated herein by reference.
/(24)/    Filed as an exhibit to the Company's 10-Q for the quarter ended May
          30, 1998 and incorporated herein by reference.
/(25)/    Filed as exhibits to the Company's Registration Statement on Forms S-8
          (333-49069) and incorporated herein by reference.
/(26)/    Filed as an exhibit to the Company's 10-K for the fiscal year ended
          August 31, 1998 and incorporated herein by reference.
/(27)/    Filed as an exhibit to the Company's 8-K filed on March 8, 2000 and
          incorporated herein by reference.
/(29)/    Filed as an exhibit to the Company's 10-Q for the quarter ended
          November 27, 1999 and incorporated herein by reference.
/(30)/    Filed as an exhibit to the Company's Registration Statement on Forms
          S-3 (333-32614) and incorporated herein by reference.
/(31)/    Filed as an exhibit to the Company's 10-K for the quarter ended
          November 25, 2000 and incorporated herein by reference.
/(32)/    Filed as an exhibit to the Company's Registration Statement on Form
          S-8 (333-58274) and incorporated herein by reference./(31)/
/(33)/    Filed as an exhibit to the Company's 10-Q for the quarter ended
          February 24, 2001 and incorporated herein by reference.
/(34)/    Filed as an exhibit to the Company's 10-Q for the quarter ended
          September 29, 2001 and incorporated herein by reference.
/(35)/    Filed as an exhibit to the Company's 8-K filed on March 6, 2002 and
          incorporated herein by reference.
/(36)/    Filed as an exhibit to the Company's 10-K for the fiscal year ended
          December 31, 2001 and incorporated herein by reference.
/(37)/    Filed as an exhibit to the Company's Annual Report on Form 10-K/A1 for
          the fiscal year ended December 31, 2001 and incorporated herein by
          reference.
/(38)/    Filed herewith.

                                        3



                                   SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange
Act of 1934, Genome Therapeutics Corp. has duly caused this report to be signed
on its behalf by the undersigned, thereunto duly authorized, on November 12,
2002.

                                                GENOME THERAPEUTICS CORP.

                                                /S/  STEPHEN COHEN
                                                -------------------------------
                                                Stephen Cohen
                                                Senior Vice President and Chief
                                                Financial Officer