UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                            ------------------------
                                    FORM 8-K

                                 CURRENT REPORT

                         PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
                            ------------------------

Date of Report (Date of earliest event reported):  September 19, 2002

                                IMMUNOGEN, INC.
               (Exact name of registrant as specified in its Charter)

Massachusetts                      0-17999                04-2726691
(State or other jurisdiction      (Commission           (IRS Employer
of incorporation)                 File Number)         Identification No.)


           128 Sidney Street, Cambridge, Massachusetts      02139
             (Address of principal executive offices)     (Zip Code)

       Registrant's telephone number, including area code: (617) 995-2500






ITEM 9. REGULATION FD DISCLOSURE

On September 19, 2002, the Registrant filed its Annual Report on Form 10-K for
the fiscal year ended June 30, 2002 with the Securities and Exchange Commission.
In connection with the filing of the Form 10-K, attached hereto as exhibits are
certifications of the Registrant's Chief Executive Officer and Chief Financial
Officer, as required by 18 U.S.C. Section 1350, as adopted pursuant to Section
906 of the Sarbanes-Oxley Act of 2002.

These certifications are being furnished herewith solely to accompany the Form
10-K, pursuant to 18 U.S.C. Section 1350, are not being filed for purposes of
Section 18 of the Securities Exchange Act of 1934, as amended and are not to
be incorporated by reference into any of the Registrant's filings with the
Securities and Exchange Commission, whether filed prior to or after the
furnishing of these certifications, regardless of any general or specific
incorporation language in any such filing.

ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS

(c)      Exhibits.

99.1     Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of
         2002 (Subsections (a) and (b) of Section 1350, Chapter 63 of Title 18,
         United States Code)



                                    SIGNATURE


         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 hereto duly authorized.



                                                 ImmunoGen, Inc.
                                                 (Registrant)

Date:    September 19, 2002                      /S/ GREGG D. BELOFF
                                                 -------------------------------
                                                     Gregg D. Beloff
                                                 Chief Financial Officer
                                                    and Vice President