SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549

                                  Schedule 13D

                    Under the Securities Exchange Act of 1934
                                (Amendment No. 1)

                                 Immunogen, Inc.
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                                (Name of Issuer)

                       Common Stock, $.01 par value share
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                         (Title of Class of Securities)

                                    45253H101
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                                 (CUSIP Number)

                              Wayne D. Bloch, Esq.
                   Klehr, Harrison, Harvey, Branzburg & Ellers
                               1401 Walnut Street
                             Philadelphia, PA 19102
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                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                  June 13, 1996
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             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box / /.

Check the following box if a fee is being paid with the statement / /. (A fee is
not required only if the reporting person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)

Note: Six copies of this statement, including all exhibits, should be filed with
the Commission. See Rule 13d-1(a) for other parties to whom copies are to be
sent.

                        (Continued on following page(s))

                                   Page 1 of 6

                                            





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CUSIP No. 45253H101                                          Page 2 of 6 Pages
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- - -------------------------------------------------------------------------------
1      NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Capital Ventures International
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2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                               (a)      /  /

                                                               (b)      /  /
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3      SEC USE ONLY


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4      SOURCE OF FUNDS*

       WC
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5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
       REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
                                                                        /  /
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6      CITIZENSHIP OR PLACE OF ORGANIZATION

       Cayman Islands
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                          7       SOLE VOTING POWER
NUMBER OF
SHARES                            1,709,299
BENEFICIALLY              ----------------------------------------------------
OWNED BY                  8       SHARED VOTING POWER
EACH
REPORTING                         N/A
PERSON                    ----------------------------------------------------
WITH                      9       SOLE DISPOSITIVE POWER

                                  1,709,299
                          ----------------------------------------------------
                           10     SHARED DISPOSITIVE POWER

                                  N/A
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11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                           1,709,299
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12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11)
       EXCLUDES CERTAIN SHARES*                                        /  /

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13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                            9.9%
- - -------------------------------------------------------------------------------
14     TYPE OF REPORTING PERSON*

                            CO
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                      *SEE INSTRUCTIONS BEFORE FILLING OUT





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CUSIP No. 45253H101                                          Page 3 of 6 Pages
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                                  Statement of
                      Reporting Persons (as defined below)

                        Pursuant to Section 13(d) of the
                         Securities Exchange Act of 1934

                                  in respect of

                                 IMMUNOGEN, INC.


                  This Report filed by Capital Ventures International ("CVI") is
the first amendment of its initial filing on Schedule 13D with respect to the
common stock, $.01 par value per share (the "Common Stock"), of Immunogen, Inc.
(the "Company").

                  The descriptions contained in this Report of certain
agreements and documents are qualified in their entirety by reference to the
completed text of such agreements and documents filed as Exhibits hereto.

                 Items 3, 4, 5 and 7 are hereby amended and restated in their
entirety as follows:
                                         

Item 3.           Source and Amount of Funds and Other Consideration.
                  ---------------------------------------------------

                  CVI is a party to a Securities Purchase Agreement with the
Company, dated as of March 15, 1996, pursuant to which CVI agreed to acquire for
purposes of investment convertible debentures in the aggregate principal amount
of $5,000,000 (the "Debentures"). Pursuant to the terms of the Securities
Purchase Agreement, two Debentures, each in an aggregate principal amount of
$2,500,000 (the "First Debenture" and the "Second Debenture", respectively) were
issued and sold to CVI in separate closings. The aggregate purchase price for
the Debentures was $5,000,000. The first closing occurred as of March 25, 1996.
The second closing occurred as of June 13, 1996. The First Debenture was
converted into Common Stock and Warrants (as defined below) on June 6, 1996 and
is no longer outstanding.

                  The outstanding principal amount of the Second Debenture
together with interest accrued thereon (at a rate of 10% per annum) is
convertible into Common Stock at a price per share (the "Conversion Price")
equal to the lesser of: (i) $2.50 (the "Fixed Conversion Price") and (ii) 85% of
the average of the closing bid prices for the Common Stock on the NASDAQ
National Market, or on the principle securities exchange or other securities
market on which the Common Stock is then being traded, for the five consecutive
trading days ending one trading day prior to the conversion date (subject to
equitable adjustments for stock splits, stock dividends, combinations,
recapitalization, reclassifications of similar events).

                  The holder of the Second Debenture has the right to convert,
at any time or from time to time, all or any part of the outstanding and unpaid
principal amount of such Debenture into (i) Common Stock at the Conversion Price
and (ii) warrants (the "Warrants") to acquire a number of shares of Common Stock
equal to 50% of the number of shares of Common Stock issuable upon such
conversion. The Warrants expire five years from the date of issuance and are
exercisable at a price of $4.00 per share.

                  Simultaneously, with the execution of the Securities Purchase
Agreement, the Company and CVI entered into a Registration Rights Agreement
pursuant to which the Company agreed to register the resale by CVI of the Common
Stock underlying the Debentures and the Warrants under the Securities Act of
1933, as amended (the "Act").

                  CVI utilized its own funds to consummate the purchase of the
Debentures.

                                                                     



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CUSIP No. 45253H101                                          Page 4 of 6 Pages
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Item 4.           Purpose of Transaction.
                  -----------------------

                  CVI acquired the Debentures for investment purposes for its
own account. CVI does not currently have any plan or intention to acquire
additional securities of the Company other than its intention to acquire the
shares of Common Stock and Warrants issuable upon conversion of the Second
Debenture and the shares of Common Stock issuable upon exercise of the Warrants.

                  Except as stated above, CVI has no plans or proposals that
relate or would result in any of the transactions referred to in sub-items (a)
through (j) of Item 4 of Schedule 13D.

Item 5.           Interest in Securities of the Issuer.
                  -------------------------------------

                  On June 6, 1996, CVI converted the First Debenture into
1,018,000 shares of Common Stock and Warrants to acquire 509,000 shares of
Common Stock. The conversion was effected at the request of the Company pursuant
to an Amendment Agreement dated June 6, 1996 (the "June Amendment"). In
consideration for agreeing to the June Amendment, CVI was granted an additional
500,000 Warrants.

                  Pursuant to the terms of the Second Debenture and the
Warrants, the holder thereof may never convert such Debenture or exercise such
Warrants to the extent that upon such conversion or exercise such holder would
hold in excess of 9.9% of the outstanding shares of Common Stock. In addition,
the disposition of the Second Debenture and the Warrants is restricted so that,
except in limited circumstances, the holder may not dispose of during any 90 day
period a portion of the Debenture and Warrants which, if converted into Common
Stock, would represent, at the time of the transfer, in the aggregate (together
with any other Common Stock transferred), beneficial ownership by the
transferee(s) of more than 9.9% of the Common Stock then outstanding. As a
result, beneficial ownership may never exceed 9.9% of the outstanding shares of
Common Stock solely on account of the Second Debenture and the Warrants.1

                  The number of shares of Common Stock beneficially owned by CVI
pursuant to the Second Debenture will fluctuate depending on the Conversion
Price from time to time in effect; provided, however, except to the extent that
shares are disposed of, the beneficial ownership will never be less than the
number of shares beneficially owned based on the Fixed Conversion Price,
but such beneficial ownership can never exceed 9.9% of the outstanding shares of
Common Stock (together with any other shares of Common Stock then owned by CVI).
To the extent the Conversion Price is less than the Fixed Conversion Price, the
number of shares beneficially owned by CVI pursuant to the Second Debenture will
increase without any action on the part of CVI, but such beneficial ownership
can never exceed 9.9% of the outstanding shares of Common Stock (together with
any other shares of Common Stock then owned by CVI). The number of shares
beneficially owned by CVI pursuant to the Second Debenture can be determined by
dividing the sum of the principal amount of such Debenture plus accrued
interest thereon by the Conversion Price then in effect.

                  To the best knowledge of CVI, none of the individuals listed
in Item 2 hereof beneficially owns any Common Stock other than through their
ownership interest in CVI. Neither CVI, nor to the best of CVI's knowledge, any
of the individuals listed in Item 2 hereof has effected any transactions in the
Common Stock during the past 60 days other than CVI's purchase of the Second
Debenture and conversion of the First Debenture.

- - -----------------------------
     1 Based on the 16,574,357 shares of Common Stock outstanding on June 13,
1996, the 9.9% limitation described above limits CVI's ownership to 1,709,299
shares of Common Stock. As a result, unless CVI sells some or all of the
1,018,000 shares of Common Stock currently held by it (or the number of
outstanding shares of Common Stock held by holders other than CVI increases),
the maximum number of shares into which CVI could convert the Second Debenture
and exercise the Warrants is 691,299.

                             



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CUSIP No. 45253H101                                          Page 5 of 6 Pages
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Item 7.           Material to be Filed as Exhibits.
                  -------------------------------------------------------------

                           Exhibit A - Securities Purchase Agreement (together
                           with Side Letter thereto and form of the Debentures,
                           Warrants and Registration Rights Agreement).*

                           Exhibit B - Limited Power of Attorney.*

                           Exhibit C - Letter Agreement, dated as of June 6,
                           1996, between CVI and the Company, incorporated by
                           reference to Exhibit 10.29 to the Company's current
                           report on Form 8-K dated June 6, 1996.





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* Previously filed with the initial filing of this Statement on Schedule 13D.







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CUSIP No. 45253H101                                          Page 6 of 6 Pages
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                                    SIGNATURE
                                    ---------

                 After reasonable inquiry and to the best of my knowledge and
belief, I certify that the information set forth in this statement is true,
complete and correct.


                 CAPITAL VENTURES INTERNATIONAL

                 By:  Bala International, Inc. (f/k/a Arbit, Inc.), pursuant to
                      a Limited Power of Attorney, a copy of which is filed
                      as an exhibit hereto



                 By:  /s/ Arthur Dantchik
                      -------------------------------------
                      Arthur Dantchik, President