GENZYME CORP
10-Q/A, 2000-10-17
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON D.C. 20549

                            ------------------------


                                AMENDMENT NO. 1
                                       TO
                                   FORM 10-Q


<TABLE>
<C>        <S>
   /X/     QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
           SECURITIES EXCHANGE ACT OF 1934
</TABLE>

                  FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2000
                                       OR

<TABLE>
<C>        <S>
   / /     TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
           SECURITIES EXCHANGE ACT OF 1934
</TABLE>

        FOR THE TRANSITION PERIOD FROM ______________ TO ______________

                         COMMISSION FILE NUMBER 0-14680

                            ------------------------

                              GENZYME CORPORATION

             (Exact name of registrant as specified in its charter)

<TABLE>
<CAPTION>
                        MASSACHUSETTS                                            06-1047163
(State or other jurisdiction of incorporation or organization)        (IRS Employer Identification No.)
<S>                                                             <C>
    ONE KENDALL SQUARE, CAMBRIDGE, MASSACHUSETTS                                    02139
      (Address of principal executive offices)                                   (zip code)
</TABLE>

                                 (617) 252-7500
              (Registrant's telephone number, including area code)

                         ------------------------------

    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 / /

    The number of shares outstanding of each of the issuer's series of common
stock as of July 31, 2000:

<TABLE>
<S>                                                           <C>
Genzyme General Division Common Stock                         86,328,455
Genzyme Molecular Oncology Division Common Stock              15,281,405
Genzyme Surgical Products Division Common Stock               14,957,403
Genzyme Tissue Repair Division Common Stock                   28,785,846
</TABLE>

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
<PAGE>
                      GENZYME CORPORATION AND SUBSIDIARIES
                            FORM 10-Q, JUNE 30, 2000

NOTE REGARDING FORWARD-LOOKING STATEMENTS

    This report on Form 10-Q contains forward-looking statements, including
statements regarding our:

    - planned creation of a new division and a new publicly traded stock;

    - planned acquisition of Biomatrix, Inc. and related financing expectations;

    - expected allocation of the new series of stock and composition of the
      merger consideration;

    - expected timing of the acquisition;

    - expected future revenues, operations and expenditures; and

    - projected cash needs.

These statements are based upon the current assumptions of our management and
are only expectations of future results. These statements are subject to risks
and uncertainties, and our actual results may differ significantly from those
that are described in this report on Form 10-Q. These risks and uncertainties
include:

    - our ability to successfully complete preclinical and clinical development
      of our products and services;

    - our ability to manufacture sufficient amounts of our products for
      development and commercialization activities;

    - our ability to obtain and maintain adequate patent and other proprietary
      rights protection of our products and services;

    - the content and timing of decisions made by the United States Food and
      Drug Administration and other regulatory agencies;

    - the accuracy of our estimates of the size and characteristics of the
      markets to be addressed by our products and services;

    - market acceptance of our products and services;

    - our ability to obtain reimbursement for our products and services from
      third-party payors;

    - our ability to establish and maintain licenses, strategic collaborations
      and distribution arrangements;

    - the continued funding of our joint ventures;

    - the accuracy of our information regarding the products and resources of
      our competitors and potential competitors;

    - the likelihood that the stockholder approvals required to create a new
      division and to complete the Biomatrix acquisition will be obtained and
      the closing conditions for the merger will be satisfied or waived;

    - conditions in financial markets relevant to the proposed merger and
      recapitalization; and

    - the operational integration of the other risks generally associated with
      mergers and recapitalizations.

                                       i
<PAGE>

    For a further description of these risks and other uncertainties, we
encourage you to carefully read Exhibit 99.2, "Factors Affecting Future
Operating Results," to our Annual Report on Form 10-K for the fiscal year ended
December 31, 1999, as amended (our "1999 Form 10-K").


NOTE REGARDING REFERENCES TO GENZYME DIVISIONS AND SERIES OF STOCK

    Throughout this Form 10-Q, the words "we," "us," "our" and "Genzyme" refer
to Genzyme Corporation and all of its operating divisions taken as a whole, and
"our board of directors" refers to the board of directors of Genzyme
Corporation. In addition, we refer to our four operating divisions as follows:

    - Genzyme General Division = "Genzyme General;"

    - Genzyme Molecular Oncology Division = "Genzyme Molecular Oncology;"

    - Genzyme Surgical Products Division = "Genzyme Surgical Products;" and

    - Genzyme Tissue Repair Division = "Genzyme Tissue Repair."

    We currently have four designated series of common stock. Each of these
series is intended to reflect the value and track the performance of one of our
divisions. We refer to each series of common stock as follows:

    - Genzyme General Division Common Stock = "Genzyme General Stock;"

    - Genzyme Molecular Oncology Division Common Stock = "Molecular Oncology
      Stock;"

    - Genzyme Surgical Products Division Common Stock = "Surgical Products
      Stock;" and

    - Genzyme Tissue Repair Division Common Stock = "Tissue Repair Stock."


    Holders of Genzyme General Stock, Molecular Oncology Stock, Surgical
Products Stock and Tissue Repair Stock are stockholders of Genzyme Corporation
and are subject to all of the risks and uncertainties of Genzyme Corporation
described in Exhibit 99.2 to our 1999 Form 10-K.


NOTE REGARDING INCORPORATION BY REFERENCE


    The Securities and Exchange Commission ("SEC") allows us to disclose
important information to you by referring you to other documents we have filed
with the SEC. The information that we refer you to is "incorporated by
reference" into this Form 10-Q. Please read that information.


NOTE REGARDING TRADEMARKS

    GENZYME-REGISTERED TRADEMARK-, CEREZYME-REGISTERED TRADEMARK-,
CEREDASE-REGISTERED TRADEMARK-, THYROGEN-REGISTERED TRADEMARK-, SEPRA
FILM-REGISTERED TRADEMARK-, CARTICEL-REGISTERED TRADEMARK- and
SNOWDEN-PENCER-REGISTERED TRADEMARK- are registered trademarks of Genzyme.
FABRAZYME-TM-, SAGE-TM-, and EPICEL-TM- are trademarks of Genzyme. GENZYME-SM-
is a service mark of Genzyme. RENAGEL-REGISTERED TRADEMARK- is a registered
trademark of GelTex Pharmaceuticals, Inc. NEUROCELL-TM--PD is a trademark of
Diacrin, Inc. ALDURAZYME-TM- is a trademark of BioMarin/Genzyme LLC. POMPASE-TM-
is a trademark of Synpac (North Carolina), Inc.

                                       ii
<PAGE>
                               TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                                         PAGE NO.
                                                                         --------
<S>        <C>                                                           <C>
PART I.    FINANCIAL INFORMATION

ITEM 1.    Financial Statements

  GENZYME CORPORATION AND SUBSIDIARIES
    Unaudited, Consolidated Statements of Operations for the Three and
     Six Months Ended June 30, 2000 and 1999...........................       1
    Consolidated Balance Sheets as of June 30, 2000 (unaudited) and
     December 31, 1999.................................................       3
    Unaudited, Consolidated Statements of Cash Flows for the Six Months
     Ended June 30, 2000 and 1999......................................       4
    Notes to Unaudited, Consolidated Financial Statements..............       5

  GENZYME GENERAL
    Unaudited, Combined Statements of Operations for the Three and Six
     Months Ended June 30, 2000 and 1999...............................      15
    Combined Balance Sheets as of June 30, 2000 (unaudited) and
     December 31, 1999.................................................      16
    Unaudited, Combined Statements of Cash Flows for the Six Months
     Ended June 30, 2000 and 1999......................................      17
    Notes to Unaudited, Combined Financial Statements..................      18

  GENZYME MOLECULAR ONCOLOGY
    Unaudited, Combined Statements of Operations for the Three and Six
     Months Ended June 30, 2000 and 1999...............................      22
    Combined Balance Sheets as of June 30, 2000 (unaudited) and
     December 31, 1999.................................................      23
    Unaudited, Combined Statements of Cash Flows for the Six Months
     Ended June 30, 2000 and 1999......................................      24
    Notes to Unaudited, Combined Financial Statements..................      25

  GENZYME SURGICAL PRODUCTS
    Unaudited, Combined Statements of Operations for the Three and Six
     Months Ended June 30, 2000 and 1999...............................      26
    Combined Balance Sheets as of June 30, 2000 (unaudited) and
     December 31, 1999.................................................      27
    Unaudited, Combined Statements of Cash Flows for the Six Months
     Ended June 30, 2000 and 1999......................................      28
    Notes to Unaudited, Combined Financial Statements..................      29

  GENZYME TISSUE REPAIR
    Unaudited, Combined Statements of Operations for the Three and Six
     Months Ended June 30, 2000 and 1999...............................      32
    Combined Balance Sheets as of June 30, 2000 (unaudited) and
     December 31, 1999.................................................      33
    Unaudited, Combined Statements of Cash Flows for the Six Months
     Ended June 30, 2000 and 1999......................................      34
    Notes to Unaudited, Combined Financial Statements..................      35

           Management's Discussion and Analysis of Financial Condition
ITEM 2.      and Results of Operations.................................      37

ITEM 3.    Quantitative and Qualitative Analysis of Market Risk........      70

PART II.   OTHER INFORMATION

ITEM 1.    Legal Proceedings...........................................      71

ITEM 4.    Submission of Matters to a Vote of Security Holders.........      71

ITEM 6.    Exhibits and Reports on Form 8-K............................      73

Signatures.............................................................      74
</TABLE>


                                      iii
<PAGE>
PART I.  FINANCIAL INFORMATION

ITEM 1.  FINANCIAL STATEMENTS

                      GENZYME CORPORATION AND SUBSIDIARIES

                     CONSOLIDATED STATEMENTS OF OPERATIONS


          (UNAUDITED, AMOUNTS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)



<TABLE>
<CAPTION>
                                                               THREE MONTHS ENDED      SIX MONTHS ENDED
                                                                    JUNE 30,               JUNE 30,
                                                              --------------------   --------------------
                                                                2000        1999       2000        1999
                                                              ---------   --------   ---------   --------
                                                              (REVISED)              (REVISED)
<S>                                                           <C>         <C>        <C>         <C>
Revenues:
  Net product sales.........................................  $201,439    $165,873   $385,860    $329,575
  Net service sales.........................................    21,347      19,799     42,313      38,529
  Revenues from research and development contracts..........     1,127       1,012      3,870       2,324
                                                              --------    --------   --------    --------
    Total revenues..........................................   223,913     186,684    432,043     370,428
                                                              --------    --------   --------    --------
Operating costs and expenses:
  Cost of products sold.....................................    53,643      44,575    101,902      88,386
  Cost of services sold.....................................    11,967      12,414     23,818      24,502
  Selling, general and administrative.......................    67,428      66,358    128,979     125,303
  Research and development (including research and
    development related to contracts).......................    28,577      40,873     84,276      73,707
  Amortization of intangibles...............................     5,684       6,166     11,782      12,373
                                                              --------    --------   --------    --------
    Total operating costs and expenses......................   167,299     170,386    350,757     324,271
                                                              --------    --------   --------    --------
Operating income............................................    56,614      16,298     81,286      46,157
                                                              --------    --------   --------    --------
Other income (expense):
  Equity in net loss of unconsolidated affiiliates..........   (11,313)     (8,962)   (19,446)    (19,100)
  Minority interest.........................................     1,352         864      2,208       1,730
  Investment income.........................................    10,631       9,102     20,575      17,288
  Interest expense..........................................    (3,836)     (5,590)    (7,775)    (11,088)
  Gain on affiliate sale of stock...........................        --          --     20,270         606
  Gain on sale of product line..............................        --       7,500         --       7,500
  Gain on sale of equity securities.........................    14,165          --     14,165       1,963
  Charge for impaired investment............................        --      (5,487)        --      (5,487)
  Other.....................................................     5,193          (3)     5,195          43
                                                              --------    --------   --------    --------
    Total other income (expense)............................    16,192      (2,576)    35,192      (6,545)
                                                              --------    --------   --------    --------
Income before income taxes..................................    72,806      13,722    116,478      39,612
Provision for income taxes..................................   (23,314)     (7,431)   (35,168)    (17,264)
                                                              --------    --------   --------    --------
Net income..................................................  $ 49,492    $  6,291   $ 81,310    $ 22,348
                                                              ========    ========   ========    ========
Comprehensive income, net of tax:
  Net income................................................  $ 49,492    $  6,291   $ 81,310    $ 22,348
                                                              --------    --------   --------    --------
  Other comprehensive income (loss), net of tax:
    Foreign currency translation adjustments................      (132)     (4,986)   (10,355)    (13,812)
                                                              --------    --------   --------    --------
    Unrealized gains (losses) on securities:
      Unrealized gains (losses) arising during the period...   (47,925)        792      4,374      (1,517)
      Reclassification adjustment for losses included in net
        income..............................................    (5,501)      3,169     (5,501)      1,945
                                                              --------    --------   --------    --------
      Unrealized gains (losses) on securities, net..........   (53,426)      3,961     (1,127)        428
                                                              --------    --------   --------    --------
  Other comprehensive income (loss).........................   (53,558)     (1,025)   (11,482)    (13,384)
                                                              --------    --------   --------    --------
Comprehensive income (loss).................................  $ (4,066)   $  5,266   $ 69,828    $  8,964
                                                              ========    ========   ========    ========
</TABLE>


  The accompanying notes are an integral part of these unaudited, consolidated
                             financial statements.

                                       1
<PAGE>
                      GENZYME CORPORATION AND SUBSIDIARIES

               CONSOLIDATED STATEMENTS OF OPERATIONS (CONTINUED)


          (UNAUDITED, AMOUNTS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)



<TABLE>
<CAPTION>
                                                               THREE MONTHS ENDED      SIX MONTHS ENDED
                                                                    JUNE 30,               JUNE 30,
                                                              --------------------   --------------------
                                                                2000        1999       2000        1999
                                                              ---------   --------   ---------   --------
                                                              (REVISED)              (REVISED)
<S>                                                           <C>         <C>        <C>         <C>
NET INCOME (LOSS) PER SHARE:
  ALLOCATED TO GENZYME GENERAL STOCK (REVISED--SEE
    NOTE 11):
    Genzyme General net income..............................  $ 63,990    $ 27,913   $109,299    $ 61,418
    Genzyme Surgical Products net loss......................        --     (16,778)        --     (27,523)
    Tax benefit allocated from Genzyme Molecular Oncology...     2,441       2,376      3,537       4,310
    Tax benefit allocated from Genzyme Surgical Products....     3,236       6,525      6,656      10,350
    Tax benefit allocated from Genzyme Tissue Repair........     1,368       3,412      3,180       7,374
                                                              --------    --------   --------    --------
    Net income allocated to Genzyme General Stock...........  $ 71,035    $ 23,448   $122,672    $ 55,929
                                                              ========    ========   ========    ========
    Net income per share of Genzyme General Stock:
      Basic.................................................  $   0.84    $   0.28   $   1.45    $   0.68
                                                              ========    ========   ========    ========
      Diluted...............................................  $   0.77    $   0.28   $   1.35    $   0.65
                                                              ========    ========   ========    ========
    Weighted average shares outstanding:
      Basic.................................................    84,948      82,644     84,725      82,301
                                                              ========    ========   ========    ========
      Diluted...............................................    95,044      92,683     94,885      92,629
                                                              ========    ========   ========    ========
  ALLOCATED TO MOLECULAR ONCOLOGY STOCK:
    Net loss................................................  $ (7,363)   $ (8,158)  $(12,420)   $(15,218)
                                                              ========    ========   ========    ========
    Net loss per share of Molecular Oncology Stock--basic
      and diluted...........................................  $  (0.54)   $  (0.64)  $  (0.92)   $  (1.20)
                                                              ========    ========   ========    ========
    Weighted average shares outstanding.....................    13,626      12,676     13,561      12,667
                                                              ========    ========   ========    ========
  ALLOCATED TO SURGICAL PRODUCTS STOCK (REVISED--SEE
    NOTE 11):
    Net loss................................................  $(10,367)   $   (880)  $(20,410)   $   (880)
                                                              ========    ========   ========    ========
    Net loss per share of Surgical Products Stock--basic and
      diluted...............................................  $  (0.70)   $  (0.06)  $  (1.37)   $  (0.06)
                                                              ========    ========   ========    ========
    Weighted average shares outstanding.....................    14,905      14,800     14,880      14,800
                                                              ========    ========   ========    ========
  ALLOCATED TO TISSUE REPAIR STOCK:
    Net loss................................................  $ (4,031)   $ (8,382)  $ (9,002)   $(17,998)
                                                              ========    ========   ========    ========
    Net loss per share of Tissue Repair Stock--basic and
      diluted...............................................  $  (0.14)   $  (0.37)  $  (0.31)   $  (0.81)
                                                              ========    ========   ========    ========
    Weighted average shares outstanding.....................    28,666      22,764     28,598      22,355
                                                              ========    ========   ========    ========
</TABLE>



  The accompanying notes are an integral part of these unaudited, consolidated
                             financial statements.


                                       2
<PAGE>
                      GENZYME CORPORATION AND SUBSIDIARIES

                          CONSOLIDATED BALANCE SHEETS

                             (AMOUNTS IN THOUSANDS)


<TABLE>
<CAPTION>
                                                               JUNE 30,     DECEMBER 31,
                                                                 2000           1999
                                                              -----------   ------------
                                                              (UNAUDITED)
                                                               (REVISED)
<S>                                                           <C>           <C>
                           ASSETS

Current assets:
  Cash and cash equivalents.................................  $  178,730     $  130,156
  Short-term investments....................................     182,877        255,846
  Accounts receivable, net..................................     180,947        166,803
  Inventories...............................................     127,347        117,269
  Prepaid expenses and other current assets.................      25,720         18,918
  Deferred tax assets--current..............................      40,776         41,195
                                                              ----------     ----------
    Total current assets....................................     736,397        730,187
Property, plant and equipment, net..........................     396,048        383,181
Long-term investments.......................................     332,603        266,988
Notes receivable-related party..............................      10,000          6,603
Intangibles, net............................................     241,077        253,153
Deferred tax assets--noncurrent.............................      14,690         18,631
Investment in equity securities.............................     108,732         97,859
Other noncurrent assets.....................................      55,518         30,680
                                                              ----------     ----------
    Total assets............................................  $1,895,065     $1,787,282
                                                              ==========     ==========

            LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
  Accounts payable..........................................  $   22,087     $   27,853
  Accrued expenses..........................................      71,674         73,359
  Income taxes payable......................................      43,609         27,946
  Deferred revenue..........................................       4,619          3,700
  Current portion of long-term debt and capital lease
    obligations.............................................         992          5,080
                                                              ----------     ----------
    Total current liabilities...............................     142,981        137,938
Long-term debt and capital lease obligations................      18,283         18,000
Convertible notes and debentures, net.......................     273,150        272,622
Other noncurrent liabilities................................       2,889          2,330
                                                              ----------     ----------
    Total liabilities.......................................     437,303        430,890
Stockholders' equity:
  Genzyme General Stock, $0.01 par value....................         854            842
  Molecular Oncology Stock, $0.01 par value.................         137            134
  Surgical Products Stock, $0.01 par value..................         150            148
  Tissue Repair Stock, $0.01 par value......................         288            285
  Treasury stock--Genzyme General--at cost..................        (901)          (901)
  Additional paid-in capital--Genzyme General Stock.........     478,455        469,776
  Additional paid-in capital--Molecular Oncology Stock......      84,036         67,672
  Additional paid-in capital--Surgical Products Stock.......     542,966        542,343
  Additional paid-in capital--Tissue Repair Stock...........     222,959        217,103
  Retained earnings.........................................     138,512         57,202
  Accumulated other comprehensive income (loss).............      (9,694)         1,788
                                                              ----------     ----------
    Total stockholders' equity..............................   1,457,762      1,356,392
                                                              ----------     ----------
    Total liabilities and stockholders' equity..............  $1,895,065     $1,787,282
                                                              ==========     ==========
</TABLE>


  The accompanying notes are an integral part of these unaudited, consolidated
                             financial statements.

                                       3
<PAGE>
                      GENZYME CORPORATION AND SUBSIDIARIES

                     CONSOLIDATED STATEMENTS OF CASH FLOWS

                       (UNAUDITED, AMOUNTS IN THOUSANDS)


<TABLE>
<CAPTION>
                                                                SIX MONTHS ENDED
                                                                    JUNE 30,
                                                              ---------------------
                                                                2000        1999
                                                              ---------   ---------
                                                              (REVISED)
<S>                                                           <C>         <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net income................................................  $  81,310   $  22,348
  Reconciliation of net income to net cash provided by
    operating activities:
    Depreciation and amortization...........................     32,838      37,033
    Provision for bad debts.................................      4,311       8,300
    Note received from collaborator.........................    (10,000)         --
    Minority interest in net loss of subsidiary.............     (2,208)     (1,730)
    Equity in net loss of unconsolidated affiliates.........     19,446      19,100
    Gain on affiliate sale of stock.........................    (20,270)       (606)
    Gain on sale of product line............................         --      (7,500)
    Gain on sale of equity securities.......................    (14,165)     (1,963)
    Charge for impaired investment..........................         --       5,487
    Deferred income tax expense (benefit), net..............      4,668      (1,324)
    Other...................................................       (253)       (550)
    Increase (decrease) in cash from working capital
      changes:
      Accounts receivable...................................    (21,718)     (9,277)
      Inventories...........................................    (12,507)     (4,095)
      Prepaid expenses and other current assets.............     (3,764)      3,622
      Accounts payable, accrued expenses, income taxes
        payable and deferred revenue........................     12,274       9,668
                                                              ---------   ---------
        Net cash provided by operating activities...........     69,962      78,513
                                                              ---------   ---------

CASH FLOWS FROM INVESTING ACTIVITIES:
  Purchases of investments..................................   (322,868)   (320,388)
  Sales and maturities of investments.......................    330,971     269,029
  Proceeds from sale of equity securities...................        837      11,090
  Purchase of equity securities.............................     (5,000)         --
  Purchase of property, plant and equipment.................    (35,859)    (30,410)
  Investment in unconsolidated affiliates...................    (12,856)    (22,269)
  Other.....................................................     (1,607)      9,141
                                                              ---------   ---------
        Net cash used in investing activities...............    (46,382)    (83,807)
                                                              ---------   ---------

CASH FLOWS FROM FINANCING ACTIVITIES:
  Proceeds from issuance of common stock....................     30,965      31,472
  Payments of debt and capital lease obligations............     (5,000)       (791)
  Other.....................................................      2,054       3,934
                                                              ---------   ---------
        Net cash provided by financing activities...........     28,019      34,615
                                                              ---------   ---------

Effect of exchange rate changes on cash.....................     (3,025)     (1,864)
                                                              ---------   ---------
Increase in cash and cash equivalents.......................     48,574      27,457
Cash and cash equivalents at beginning of period............    130,156     118,612
                                                              ---------   ---------
Cash and cash equivalents at end of period..................  $ 178,730   $ 146,069
                                                              =========   =========
</TABLE>


  The accompanying notes are an integral part of these unaudited, consolidated
                             financial statements.

                                       4
<PAGE>
                      GENZYME CORPORATION AND SUBSIDIARIES
             NOTES TO UNAUDITED, CONSOLIDATED FINANCIAL STATEMENTS

1.  BASIS OF PRESENTATION


    Our unaudited consolidated financial statements for each period include the
balance sheets, results of operations and cash flows of each of our divisions
and corporate operations taken as a whole. We eliminate all significant
intracompany items and transactions in consolidation. We prepared the unaudited,
consolidated financial statements for Genzyme following the requirements of the
SEC for interim reporting. As permitted under those rules, certain footnotes or
other financial information that are normally required by generally accepted
accounting principles can be condensed or omitted. We have reclassified certain
1999 data to conform with our 2000 presentation.



    On June 1, 2000, Celtrix Pharmaceuticals, Inc. was acquired by Insmed Inc.
upon which our shares of Celtrix common stock were exchanged on a 1-for-1 basis
for shares of Insmed common stock. On the date of the exchange, we recognized
the unrealized gain of $7.6 million, net of tax, as a credit to stockholders'
equity. We should have recognized this gain as a realized gain and recorded such
gain in income. Accordingly, we have revised our financial statements for the
three and six months ended June 30, 2000 to reclassify the $7.6 million gain,
net of tax, from an unrealized gain to a realized gain. The impact of this
revision on the three and six months ended June 30, 2000 is as follows:



<TABLE>
<CAPTION>
                                             PREVIOUSLY REPORTED                   REVISED
                                        -----------------------------   -----------------------------
                                          3 MONTHS        6 MONTHS        3 MONTHS        6 MONTHS
                                        -------------   -------------   -------------   -------------
                                         (UNAUDITED, AMOUNTS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                     <C>             <C>             <C>             <C>
Gain on sale of equity securities.....     $  6,592        $  6,592        $ 14,165        $ 14,165
Income before income taxes............       65,233         108,905          72,806         116,478
Provision for income taxes............      (20,699)        (32,553)        (23,314)        (35,168)
Net income............................       44,534          76,352          49,492          81,310
Net income allocated to Genzyme
  General Stock.......................       66,077         117,714          71,035         122,672
Net income per share of Genzyme
  General Stock:
  Basic...............................     $   0.78        $   1.39        $   0.84        $   1.45
  Diluted.............................     $   0.72        $   1.29        $   0.77        $   1.35
</TABLE>



    These financial statements include all normal and recurring adjustments that
we consider necessary for the fair presentation of our financial position and
operating results. Since these are interim financial statements, you should also
read the financial statements and notes included in our 1999 Form 10-K, as
amended. Revenues, expenses, assets and liabilities can vary from quarter to
quarter. Therefore, the results and trends in these interim financial statements
may not be the same as those for future periods.



2.  INVENTORIES (AMOUNTS IN THOUSANDS):



<TABLE>
<CAPTION>
                                                  JUNE 30, 2000   DECEMBER 31, 1999
                                                  -------------   -----------------
                                                   (UNAUDITED)
<S>                                               <C>             <C>
Raw materials...................................    $ 49,555          $ 39,958
Work-in-process.................................      41,748            44,559
Finished products...............................      36,044            32,752
                                                    --------          --------
  Total.........................................    $127,347          $117,269
                                                    ========          ========
</TABLE>


                                       5
<PAGE>
                      GENZYME CORPORATION AND SUBSIDIARIES
       NOTES TO UNAUDITED, CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


3.  INVESTMENT IN FOCAL, INC.


    In April 2000, Focal, Inc. exercised its first option under the stock
purchase agreement between Genzyme and Focal. As required by the terms of this
agreement, we purchased $5.0 million of Focal common stock at a price of $8.14
per share. We have allocated these shares to Genzyme Surgical Products. We are
committed, at Focal's option, to make future additional equity investments of up
to $10.0 million subject to certain conditions.


4.  REGISTRATION STATEMENTS


    In March 2000, we filed with the SEC a prospectus pursuant to Rule 424 of
the Securities Act of 1933, as amended, covering the offering of 3,000,000
shares of Molecular Oncology Stock (plus 450,000 shares issuable upon exercise
of the underwriter's over-allotment option). In April 2000, in light of market
volatility and market conditions at the time, we terminated the offering of
shares of Molecular Oncology Stock contemplated by the prospectus.

    Pursuant to a prospectus filed under Rule 424 of the Securities Act of 1933,
as amended, in July 2000, we sold 1,607,400 shares of Molecular Oncology Stock
to a limited number of purchasers at a price of $12.91 per share. We received
approximately $20.7 million of net proceeds from the offering which we allocated
to Genzyme Molecular Oncology. The proceeds of this offering will be used
primarily to fund Genzyme Molecular Oncology's research, preclinical and
clinical development programs, and for its working capital and general corporate
purposes.


5.  INTERDIVISIONAL FINANCING ARRANGEMENTS



GENZYME MOLECULAR ONCOLOGY



    In April 2000, Genzyme Molecular Oncology drew $15.0 million of cash under
its interdivisional financing arrangement with Genzyme General in exchange for
676,254 Genzyme Molecular Oncology designated shares. As required by our
charter, the number of Genzyme Molecular Oncology designated shares was
determined using the average closing price of Molecular Oncology Stock for the
20 trading days beginning on the 30th trading day before the draw. As of
June 30, 2000 $15 million remained available to Genzyme Molecular Oncology under
this arrangement.



GENZYME TISSUE REPAIR



    In March 2000, Genzyme Tissue Repair made a $5.0 million draw under its
interdivisional financing arrangement with Genzyme General in exchange for
765,169 Genzyme Tissue Repair designated shares. As required by our charter, the
number of Genzyme Tissue Repair designated shares was determined using the
average closing price of Tissue Repair Stock for the 20 trading days beginning
on the 30th trading day before the draw. As of June 30, 2000 $15 million
remained available to Genzyme Tissue Repair under this arrangement.



6.  LICENSE AND STRATEGIC ALLIANCE AGREEMENTS


    In March 2000, Genzyme General recorded $19.5 million as research and
development expense, representing the initial amounts payable to Synpac (North
Carolina), Inc. under a license granted by Synpac to Genzyme to develop and
commercialize Pompase-TM- enzyme replacement therapy for Pompe disease, which is
produced using a Chinese hamster ovary cell line. In connection with this
license, Genzyme General will pay Synpac certain amounts upon the achievement of
certain development and commercialization milestones. Genzyme General will also
pay Synpac royalties for a specified period of time based on certain percentages
of sales.

                                       6
<PAGE>
                      GENZYME CORPORATION AND SUBSIDIARIES
       NOTES TO UNAUDITED, CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


6.  LICENSE AND STRATEGIC ALLIANCE AGREEMENTS (CONTINUED)

    In June 2000, Genzyme and Pharming Group N.V. entered into a strategic
alliance agreement to share in the development and funding for the
commercialization of Pompase-TM- enzyme replacement therapy. Upon execution of
the definitive agreement, Pharming paid Genzyme cash of $250,000 and issued to
Genzyme a $10.0 million 7% Convertible Senior Note due June 1, 2004 (the
"Pharming Note"). This consideration was a reimbursement for 50% of the amounts
Genzyme previously paid to Synpac for product development and technology fees
and expenses. Accordingly, Genzyme recorded the $10.3 million as a reduction to
research and development expense during the three months ended June 30, 2000.

    The Pharming Note is convertible at any time at Genzyme's option into fully
paid and nonassessable Ordinary Shares of Pharming. We have allocated our
interest in the Pharming Note to Genzyme General and have classified the
Pharming Note as a long-term, related party note receivable as of June 30, 2000.


7.  GAIN ON AFFILIATE SALE OF STOCK



    In February 2000, Genzyme Transgenics Corporation, an unconsolidated
affiliate, completed an offering of 3.5 million shares of Genzyme Transgenics
common stock, resulting in net proceeds to Genzyme Transgenics of $75.2 million
(after the exercise of the underwriter's overallotment option). In accordance
with our policy pertaining to affiliate sales of stock, we recognized a gain of
$20.3 million and recorded a net deferred tax expense of $3.9 million for the
three months ended March 31, 2000. The deferred tax expense is net of a
$3.4 million credit for the reversal of a valuation allowance on a deferred tax
asset. As a result of the issuance of the additional shares by Genzyme
Transgenics, our ownership interest in Genzyme Transgenics decreased from 33% to
28%.



8.  GAIN ON SALE OF EQUITY SECURITIES


    In June 2000, Genzyme General recorded a gain of $5.5 million upon the sale
of a portion of its investment in Genzyme Transgenics common stock. The tax
effect of this gain was fully offset by the reversal of a $1.9 million valuation
allowance related to previously recognized capital losses.


9.  SETTLEMENT OF LAWSUIT


    In April 2000, we received net proceeds of approximately $5.1 million in
connection with the settlement of a lawsuit, which we recorded as other income
in our unaudited, consolidated statements of operations for the three and six
months ended June 30, 2000. The lawsuit, initiated in 1993, pertained to an
accidental spill of Ceredase-Registered Trademark- enzyme at a fill facility
operated by a contractor to Genzyme. We allocated the net proceeds of the
settlement of this lawsuit to Genzyme General.


10.  TAX PROVISION



<TABLE>
<CAPTION>
                                     THREE MONTHS ENDED                   SIX MONTHS ENDED
                                          JUNE 30,         INCREASE/          JUNE 30,         INCREASE/
                                    --------------------   (DECREASE)   --------------------   (DECREASE)
                                      2000        1999      % CHANGE      2000        1999      % CHANGE
                                    ---------   --------   ----------   ---------   --------   ----------
                                    (REVISED)                           (REVISED)
                                          (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                 <C>         <C>        <C>          <C>         <C>        <C>
Provision for income taxes........   $23,314     $7,431       214%       $35,168    $17,264       104%
Tax rate..........................       32%        54%                      30%        44%
</TABLE>


    Our tax rates for both periods vary from the U.S. statutory tax rate as a
result of our:

    - provision for state income taxes;

    - use of a foreign sales corporation;

                                       7
<PAGE>
                      GENZYME CORPORATION AND SUBSIDIARIES
       NOTES TO UNAUDITED, CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


10.  TAX PROVISION (CONTINUED)

    - nondeductible amortization of intangibles;

    - use of tax credits; and

    - share of losses of unconsolidated affiliates.

    In the three months ended June 30, 2000 we reversed a $1.9 million valuation
allowance, which reduced our tax rate for the period by 2.9%. In the six months
ended June 30, 2000, we reversed valuation allowances totaling $5.3 million,
which reduced our tax rate for the period by 4.9%.


11.  NET INCOME (LOSS) PER SHARE



REVISION



    We had previously reported income (loss) allocated to Genzyme General Stock
and Surgical Products Stock, and earnings per share of Genzyme General Stock for
the three and six months ended June 30, 1999, as adjusted to retroactively
reflect the changes in earnings allocations resulting from the June 1999
creation and distribution of Surgical Products Stock. The allocation of
Genzyme's historical earnings has been revised to reflect an allocation of
Genzyme's earnings to each series of common stock outstanding in periods prior
to June 1999 and to each series of common stock, including Surgical Products
Stock, thereafter. The impact of these revisions are as follows:



<TABLE>
<CAPTION>
                                                          THREE MONTHS ENDED            SIX MONTHS ENDED
                                                             JUNE 30, 1999                JUNE 30, 1999
                                                      ---------------------------   -------------------------
                                                         (AMOUNTS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                                   <C>                           <C>
GENZYME GENERAL:
  PREVIOUSLY REPORTED (PRO FORMA INFORMATION
    PREVIOUSLY REPORTED AS HISTORICAL):
    Net income allocated to Genzyme General Stock...           $ 40,226                     $ 83,452
                                                               ========                     ========
    Net income per share of Genzyme General Stock:
      Basic.........................................           $   0.49                     $   1.01
                                                               ========                     ========
      Diluted.......................................           $   0.46                     $   0.95
                                                               ========                     ========
  AS REVISED:
    Net income allocated to Genzyme General Stock...           $ 23,448                     $ 55,929
                                                               ========                     ========
    Net income per share of Genzyme General Stock:
      Basic.........................................           $   0.28                     $   0.68
                                                               ========                     ========
      Diluted.......................................           $   0.28                     $   0.65
                                                               ========                     ========
GENZYME SURGICAL PRODUCTS:
  PREVIOUSLY REPORTED (PRO FORMA INFORMATION
    PREVIOUSLY REPORTED AS HISTORICAL):
    Net loss allocated to Surgical Products Stock...           $(17,658)                    $(28,403)
                                                               ========                     ========
  AS REVISED:
    Net loss allocated to Surgical Products Stock...           $   (880)                    $   (880)
                                                               ========                     ========
    Net loss per share of Surgical Products
      Stock--basic and diluted......................           $  (0.06)                    $  (0.06)
                                                               ========                     ========
    Weighted average shares outstanding.............             14,800                       14,800
                                                               ========                     ========
</TABLE>



    If the shares of Surgical Products Stock initially issued on June 28, 1999
were assumed to be outstanding since January 1, 1998, net income allocated to
Genzyme General Stock, net loss allocated


                                       8
<PAGE>
                      GENZYME CORPORATION AND SUBSIDIARIES
       NOTES TO UNAUDITED, CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


11.  NET INCOME (LOSS) PER SHARE (CONTINUED)


to Surgical Products Stock and weighted average shares outstanding would have
been as follows (in thousands):



<TABLE>
<CAPTION>
                                                             THREE MONTHS ENDED   SIX MONTHS ENDED
                                                               JUNE 30, 1999       JUNE 30, 1999
                                                             ------------------   ----------------
<S>                                                          <C>                  <C>
Genzyme General:
  Net income allocated to Genzyme General Stock............       $ 40,226            $ 83,452
                                                                  ========            ========
  Weighted average shares outstanding:
    Basic..................................................         82,644              82,301
    Diluted................................................         92,683              92,629
Genzyme Surgical Products:
  Net loss allocated to Surgical Products Stock............       $(17,658)           $(28,403)
                                                                  ========            ========
  Weighted average shares outstanding-basic and diluted....         14,800              14,800
</TABLE>


                                       9
<PAGE>
                      GENZYME CORPORATION AND SUBSIDIARIES
       NOTES TO UNAUDITED, CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


11.  NET INCOME (LOSS) PER SHARE (CONTINUED)


GENZYME GENERAL STOCK (REVISED):



    The following table sets forth our computation of basic and diluted earnings
per share of Genzyme General Stock:



<TABLE>
<CAPTION>
                                                       THREE MONTHS ENDED            SIX MONTHS ENDED
                                                            JUNE 30,                     JUNE 30,
                                                     -----------------------      -----------------------
                                                       2000           1999          2000           1999
                                                     ---------      --------      ---------      --------
                                                     (REVISED)                    (REVISED)
                                                       (AMOUNTS IN THOUSANDS EXCEPT PER SHARE AMOUNTS)
<S>                                                  <C>            <C>           <C>            <C>
Genzyme General net income.........................   $63,990       $27,913       $109,299       $61,418
Genzyme Surgical Products net loss.................        --       (16,778)            --       (27,523)
Tax benefit allocated from Genzyme Molecular
  Oncology.........................................     2,441         2,376          3,537         4,310
Tax benefit allocated from Genzyme Surgical
  Products.........................................     3,236         6,525          6,656        10,350
Tax benefit allocated from Genzyme Tissue Repair...     1,368         3,412          3,180         7,374
                                                      -------       -------       --------       -------
Net income allocated to Genzyme General
  Stock--basic.....................................    71,035        23,448        122,672        55,929
  Effect of dilutive securities (net of tax):
    5 1/4% convertible subordinated notes (1)
      Interest expense.............................     2,250         1,903          4,358         3,949
      Amortization of debt discount and offering
        costs (2)..................................       161           136            311           282
    5% convertible subordinated debentures (3)
      Interest expense.............................       179           154            350           319
      Amortization of debt offering costs (4)......        30            25             60            53
                                                      -------       -------       --------       -------
Net income allocated to Genzyme General Stock--
  diluted..........................................   $73,655       $25,666       $127,751       $60,532
                                                      =======       =======       ========       =======
Shares used in computing net income per common
  share--basic.....................................    84,948        82,644         84,725        82,301
                                                      -------       -------       --------       -------
  Effect of dilutive securities:
    Employee and director stock options............     3,153         3,071          3,217         3,356
    Warrants.......................................        --            25             --            29
    5 1/4% convertible subordinated notes (1)......     6,313         6,313          6,313         6,313
    5% convertible subordinated debentures (3).....       630           630            630           630
                                                      -------       -------       --------       -------
  Dilutive potential common shares (5).............    10,096        10,039         10,160        10,328
                                                      -------       -------       --------       -------
Shares used in computing net income per common
  share--diluted (5)...............................    95,044        92,683         94,885        92,629
                                                      =======       =======       ========       =======
Net income per share of Genzyme General Stock:
    Basic..........................................   $  0.84       $  0.28       $   1.45       $  0.68
                                                      =======       =======       ========       =======
    Diluted (5)....................................   $  0.77       $  0.28       $   1.35       $  0.65
                                                      =======       =======       ========       =======
</TABLE>


------------------------


(1) We issued these notes in May 1998.



(2) We are amortizing the debt discount and offering costs of approximately
    $7.0 million over the term of these notes, which mature in June 2005.



(3) We issued these debentures in August 1998.



(4) We are amortizing the debt offering costs of approximately $0.9 million over
    the term of these debentures, which mature in August 2003.


                                       10
<PAGE>
                      GENZYME CORPORATION AND SUBSIDIARIES
       NOTES TO UNAUDITED, CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


11.  NET INCOME (LOSS) PER SHARE (CONTINUED)


(5) We did not include the securities described in the following table in the
    computation of Genzyme General's diluted earnings per share because these
    securities had an exercise price greater than the average market price of
    Genzyme General Stock:


<TABLE>
<CAPTION>
                                                        THREE MONTHS ENDED     SIX MONTHS ENDED
                                                             JUNE 30,              JUNE 30,
                                                        -------------------   -------------------
                                                          2000       1999       2000       1999
                                                        --------   --------   --------   --------
                                                                 (AMOUNTS IN THOUSANDS)
<S>                                                     <C>        <C>        <C>        <C>
Total shares of Genzyme General Stock issuable for
  options.............................................   3,615      1,801      3,290      1,591
                                                         =====      =====      =====      =====
</TABLE>


MOLECULAR ONCOLOGY STOCK:



    In accounting for the acquisition of PharmaGenics, Inc. in June 1997,
Genzyme Molecular Oncology recorded a valuation allowance against a $2.9 million
tax asset related to acquired net operating losses due to the application of our
policy of accounting for income taxes at the divisional level as if each
division were a separate taxpayer. As a result, Genzyme Molecular Oncology
recorded an additional $2.9 million of goodwill that was not recorded at the
consolidated level. The amortization of this goodwill increases the loss of
Genzyme Molecular Oncology and, therefore, the loss allocated to Molecular
Oncology Stock.



    For all periods presented, basic and diluted net loss per share of Molecular
Oncology Stock are the same. We did not include the securities described in the
following table in the computation of Molecular Oncology Stock diluted net loss
per share for each period because these securities would have an anti-dilutive
effect due to the net loss allocated to Molecular Oncology Stock:



<TABLE>
<CAPTION>
                                                        THREE MONTHS ENDED     SIX MONTHS ENDED
                                                             JUNE 30,              JUNE 30,
                                                        -------------------   -------------------
                                                          2000       1999       2000       1999
                                                        --------   --------   --------   --------
                                                                 (AMOUNTS IN THOUSANDS)
<S>                                                     <C>        <C>        <C>        <C>
Shares of Molecular Oncology Stock issuable for
  options (1).........................................     566          2        619          2
Warrants to purchase Molecular Oncology Stock.........      10         10         10         10
Shares of Molecular Oncology Stock issuable upon
  conversion of the 5 1/4% convertible subordinated
  notes...............................................     682        682        682        682
Genzyme Molecular Oncology designated shares (2)......   1,318        728      1,318        728
                                                         -----      -----      -----      -----
Total shares excluded from the diluted loss per
  Genzyme Molecular Oncology share calculation........   2,576      1,422      2,629      1,422
                                                         =====      =====      =====      =====
</TABLE>


------------------------

(1) Excludes the following securities that had an exercise price greater than
    the average market price of Molecular Oncology Stock during each respective
    period:


<TABLE>
<CAPTION>
                                                        THREE MONTHS ENDED     SIX MONTHS ENDED
                                                             JUNE 30,              JUNE 30,
                                                        -------------------   -------------------
                                                          2000       1999       2000       1999
                                                        --------   --------   --------   --------
                                                                 (AMOUNTS IN THOUSANDS)
<S>                                                     <C>        <C>        <C>        <C>
Shares with exercise prices greater than the average
  market price Molecular Oncology Stock during the
  period..............................................     25       1,678        14       1,577
                                                           ==       =====        ==       =====
</TABLE>


(2) Genzyme Molecular Oncology designated shares are authorized shares of
    Molecular Oncology Stock that are not issued and outstanding, but which our
    board may issue, sell, or distribute without allocating the proceeds to
    Genzyme Molecular Oncology.

                                       11
<PAGE>
                      GENZYME CORPORATION AND SUBSIDIARIES
       NOTES TO UNAUDITED, CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


11.  NET INCOME (LOSS) PER SHARE (CONTINUED)


SURGICAL PRODUCTS STOCK (REVISED):



    We created Genzyme Surgical Products on June 28, 1999. Prior to this date,
the operations of Genzyme Surgical Products were included in the operations
allocated to Genzyme General and, therefore, in the net income allocated to
Genzyme General Stock. Net loss per share data of Surgical Products Stock is
calculated using the net loss allocated to Genzyme Surgical Products for the
period June 28, 1999 through June 30, 1999 and weighted average shares
outstanding during the same period. If the shares of Surgical Products Stock
initially issued on June 28, 1999 were assumed to be outstanding since January
1, 1999, net loss allocated to Surgical Products Stock and weighted average
shares outstanding would have been as follows:



<TABLE>
<CAPTION>
                                                             THREE MONTHS ENDED   SIX MONTHS ENDED
                                                               JUNE 30, 1999       JUNE 30, 1999
                                                             ------------------   ----------------
                                                                    (AMOUNTS IN THOUSANDS)
<S>                                                          <C>                  <C>
  Net loss allocated to Surgical Products Stock............       $(17,658)           $(28,403)
                                                                  ========            ========
  Weighted average shares outstanding-basic and diluted....         14,800              14,800
</TABLE>



    Basic and diluted net loss per share of Surgical Products Stock is the same.
We did not include the securities described in the following table in the
computation of Surgical Products Stock diluted net loss per share for each
period because these securities would have an anti-dilutive effect due to the
net loss allocated to Surgical Products Stock:



<TABLE>
<CAPTION>
                                                             THREE MONTHS ENDED   SIX MONTHS ENDED
                                                                  JUNE 30,            JUNE 30,
                                                             ------------------   ----------------
                                                                    2000                2000
                                                             ------------------   ----------------
                                                                    (AMOUNTS IN THOUSANDS)
<S>                                                          <C>                  <C>
Shares of Surgical Products Stock issuable for options
  (1)......................................................          350                  451
Shares of Surgical Products Stock issuable upon conversion
  of the 5 1/4% convertible subordinated notes.............        1,130                1,130
Genzyme Surgical Products designated shares (2)............           35                   --
                                                                   -----                -----
Total shares excluded from the diluted loss per Surgical
  Products Stock share calculation.........................        1,515                1,581
                                                                   =====                =====
</TABLE>


------------------------

(1) Excludes the following securities that had an exercise price greater than
    the average market price of Surgical Products Stock during each respective
    period:

<TABLE>
<CAPTION>
                                                             THREE MONTHS ENDED   SIX MONTHS ENDED
                                                                  JUNE 30,            JUNE 30,
                                                             ------------------   ----------------
                                                                    2000                2000
                                                             ------------------   ----------------
                                                                    (AMOUNTS IN THOUSANDS)
<S>                                                          <C>                  <C>
Shares with exercise prices greater than the average market
  price Surgical Products Stock during the period..........           37                   24
                                                                   =====                =====
</TABLE>

(2) Genzyme Surgical Products designated shares are authorized shares of
    Surgical Products Stock that are not issued and outstanding, but which our
    board may issue, sell, or distribute without allocating the proceeds to
    Genzyme Surgical Products.

                                       12
<PAGE>
                      GENZYME CORPORATION AND SUBSIDIARIES
       NOTES TO UNAUDITED, CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


11.  NET INCOME (LOSS) PER SHARE (CONTINUED)

TISSUE REPAIR STOCK:


    For all periods presented, basic and diluted net loss per share of Tissue
Repair Stock is the same. We did not include the securities described in the
following table in the computation of Tissue Repair Stock diluted net loss per
share for each period because these securities would have an anti-dilutive
effect due to the net loss allocated to Tissue Repair:


<TABLE>
<CAPTION>
                                                        THREE MONTHS ENDED     SIX MONTHS ENDED
                                                             JUNE 30,              JUNE 30,
                                                        -------------------   -------------------
                                                          2000       1999       2000       1999
                                                        --------   --------   --------   --------
                                                                 (AMOUNTS IN THOUSANDS)
<S>                                                     <C>        <C>        <C>        <C>
Shares of Tissue Repair Stock issuable for options
  (1).................................................     209           4       271           3
Shares of Tissue Repair Stock issuable upon conversion
  of 5% convertible subordinated note (2).............      --       4,418        --       4,418
Genzyme Tissue Repair designated shares (3)...........   2,959       2,289     2,959       2,289
                                                         -----      ------     -----      ------
Total shares excluded from the diluted loss per Tissue
  Repair Stock share calculation......................   3,168       6,711     3,230       6,710
                                                         =====      ======     =====      ======
</TABLE>

------------------------

(1) Excludes the following securities that had an exercise price greater than
    the average market price of Tissue Repair Stock during each respective
    period:


<TABLE>
<CAPTION>
                                                        THREE MONTHS ENDED     SIX MONTHS ENDED
                                                             JUNE 30,              JUNE 30,
                                                        -------------------   -------------------
                                                          2000       1999       2000       1999
                                                        --------   --------   --------   --------
                                                                 (AMOUNTS IN THOUSANDS)
<S>                                                     <C>        <C>        <C>        <C>
Shares with exercise prices greater than the average
  market price Tissue Repair Stock during the
  period..............................................   2,636      3,832      2,560      3,773
                                                         =====      =====      =====      =====
</TABLE>


(2) The conversion of Genzyme Tissue Repair's 5% convertible subordinated note
    was completed in the fourth quarter of 1999.

(3) Genzyme Tissue Repair designated shares are authorized shares of Tissue
    Repair Stock that are not issued and outstanding, but which our board may
    issue, sell, or distribute without allocating the proceeds to Genzyme Tissue
    Repair.


12.  SEGMENT REPORTING


    We present segment information in a manner consistent with the method we use
to report this information to our management. We have five reportable segments:

    - Therapeutics, which develops, manufactures and distributes human
      therapeutic products for significant unmet medical needs. The business
      derives substantially all of its revenue from sales of
      Cerezyme-Registered Trademark- enzyme;

    - Diagnostic Products, which provides diagnostic products to niche markets
      with a focus on IN VITRO diagnostics;

    - Genzyme Molecular Oncology, which is developing cancer products, with a
      focus on therapeutic vaccines and angiogenesis inhibitors;

    - Genzyme Surgical Products, which develops, manufactures and markets
      surgical products for cardiovascular surgery and general surgery; and

                                       13
<PAGE>
                      GENZYME CORPORATION AND SUBSIDIARIES
       NOTES TO UNAUDITED, CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


12.  SEGMENT REPORTING (CONTINUED)

    - Genzyme Tissue Repair, which develops and markets biological products for
      orthopedic injuries, such as cartilage repair, and severe burns.

    Information concerning the operations in these reportable segments is as
follows:


<TABLE>
<CAPTION>
                                                                THREE MONTHS ENDED        SIX MONTHS ENDED
                                                                     JUNE 30,                 JUNE 30,
                                                              -----------------------   ---------------------
                                                                 2000         1999        2000        1999
                                                              ----------   ----------   ---------   ---------
                                                              (REVISED)                 (REVISED)
                                                                     (UNAUDITED, AMOUNTS IN THOUSANDS)
<S>                                                           <C>          <C>          <C>         <C>
Revenues:
  Genzyme General:
    Therapeutics............................................   $148,578     $119,223    $282,380    $234,264
    Diagnostic Products.....................................     15,539       14,955      30,777      29,646
    Other...................................................     22,425       19,456      43,847      39,914
    Eliminations/Adjustments (1)............................        152          571         316       1,147
                                                               --------     --------    --------    --------
      Total Genzyme General.................................    186,694      154,205     357,320     304,971
    Genzyme Molecular Oncology..............................        963        1,133       3,518       2,746
    Genzyme Surgical Products...............................     29,969       26,681      59,051      54,034
    Genzyme Tissue Repair...................................      6,287        4,665      12,154       8,688
    Eliminations/Adjustments (2)............................         --           --          --         (11)
                                                               --------     --------    --------    --------
      Total.................................................   $223,913     $186,684    $432,043    $370,428
                                                               ========     ========    ========    ========
Net income (loss):
  Net income (loss) allocated to Genzyme General Stock:
    Division net income (loss)--Genzyme General:
      Therapeutics..........................................   $ 54,252     $ 32,910    $ 83,515    $ 66,781
      Diagnostic Products...................................        815        1,071       1,530       2,200
      Other.................................................       (625)         187        (796)     (1,851)
      Eliminations/Adjustments (3)..........................      9,548       (6,255)     25,050      (5,712)
                                                               --------     --------    --------    --------
    Net income for Genzyme General..........................     63,990       27,913     109,299      61,418
    Genzyme Surgical Products net loss (4)..................         --      (16,778)         --     (27,523)
    Tax benefits allocated from other Genzyme divisions.....      7,045       12,313      13,373      22,034
                                                               --------     --------    --------    --------
  Net income allocated to Genzyme General Stock.............     71,035       23,448     122,672      55,929
  Net loss allocated to Molecular Oncology Stock............     (7,363)      (8,158)    (12,420)    (15,218)
  Net loss allocated to Surgical Products Stock.............    (10,367)        (880)    (20,410)       (880)
  Net loss allocated to Tissue Repair Stock.................     (4,031)      (8,382)     (9,002)    (17,998)
  Eliminations/Adjustments (5)..............................        218          263         470         515
                                                               --------     --------    --------    --------
      Total.................................................   $ 49,492     $  6,291    $ 81,310    $ 22,348
                                                               ========     ========    ========    ========
</TABLE>


------------------------------

(1) Includes primarily amounts related to Genzyme General's corporate research
    and development and administrative activities that we do not specifically
    allocate to a particular segment of Genzyme General.


(2) Represents the elimination of inter-divisional revenues.



(3) Includes primarily amounts related to Genzyme General's corporate research
    and development and administrative activities that we do not specifically
    allocate to a particular segment of Genzyme General. The six months ended
    June 30, 2000 also includes a gain of $20.3 million relating to a public
    offering of common shares by Genzyme Transgenics. (See Note 7 above.)



(4) Represents losses incurred by Genzyme Surgical Products prior to June 28,
    1999. The allocation of Genzyme's earnings has been revised to reflect an
    allocation of Genzyme's earnings to each common stock actually outstanding
    prior to June 1999 and to each series of common stock, including Surgical
    Products Stock, thereafter. (See Note 11 above.)



(5) Consists primarily of a difference in amortization due to $2.9 million of
    additional goodwill associated with the PharmaGenics Inc. acquisition
    carried at the Genzyme Molecular Oncology level as compared to amounts
    carried at the consolidated level and other adjustments related to our
    corporate activities that we do not specifically allocate to a particular
    segment. The difference in the amortization results from the application of
    our policy to account for income taxes at the divisional level as if each
    division were a separate taxpayer.


    There has been no material change in segment assets since December 31, 1999.

                                       14
<PAGE>
                      GENZYME CORPORATION AND SUBSIDIARIES
       NOTES TO UNAUDITED, CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


13.  ACQUISITION OF BIOMATRIX, INC. AND FORMATION OF GENZYME BIOSURGERY



    In March 2000, we entered into an agreement to acquire Biomatrix, Inc. Upon
the effectiveness of our Registration Statement on Form S-4 and completion of
the merger, we will form a new operating division called Genzyme Biosurgery and
create a new series of common stock that is intended to reflect its value and
track its performance. We refer to this stock as "Biosurgery Stock." In
connection with the merger, and upon Genzyme shareholder approval, the assets
and liabilities allocated to Genzyme Surgical Products and Genzyme Tissue Repair
will be re-allocated to Genzyme Biosurgery and shares of Surgical Products Stock
and Tissue Repair Stock will be exchanged for Biosurgery Stock. We will account
for the acquisition of Biomatrix as a purchase.



    Biomatrix stockholders will receive $37.00 in cash, one share of Biosurgery
Stock or a combination of cash and stock for each share of Biomatrix common
stock they hold. The merger agreement provides that we will pay cash for up to
28.38% of the outstanding shares of Biomatrix common stock that receive merger
consideration, or up to approximately $245.0 million.


    Holders of Surgical Products Stock will receive 0.6060 share of Biosurgery
Stock in exchange for each share of Surgical Products Stock they hold and
holders of Tissue Repair Stock will receive 0.3352 share of Biosurgery Stock in
exchange for each share of Tissue Repair Stock they hold.

    For more information about the merger and the merger consideration, we
encourage you to carefully read the Pre-Effective Amendment No. 1 to our
Registration Statement on Form S-4 filed with the SEC on July 3, 2000.


14.  NEW ACCOUNTING PRONOUNCEMENTS


    In March 2000, the Financial Accounting Standards Board ("FASB") issued FASB
Interpretation No. 44, "Accounting for Certain Transactions Involving Stock
Compensation--an interpretation of Accounting Principles Board Opinion No. 25"
("FIN-44"). FIN-44 will be effective on July 1, 2000, but certain conclusions in
FIN-44 cover specific events that occurred after either December 15, 1998 or
January 12, 2000.

    In December 1999, the SEC issued Staff Accounting Bulletin No. 101, "Revenue
Recognition in Financial Statements" ("SAB 101") which summarizes the staff's
view in applying generally accepted accounting principles to selected revenue
recognition issues. SAB 101 will be effective in the fourth quarter of 2000.

    We are currently evaluating the guidance provided in FIN-44 and SAB 101 and
do not expect their application to have a material effect on our financial
statements.

                                       15
<PAGE>
                                GENZYME GENERAL
                       A DIVISION OF GENZYME CORPORATION

                       COMBINED STATEMENTS OF OPERATIONS

                       (UNAUDITED, AMOUNTS IN THOUSANDS)


<TABLE>
<CAPTION>
                                                                  THREE MONTHS
                                                                     ENDED             SIX MONTHS ENDED
                                                                    JUNE 30,               JUNE 30,
                                                              --------------------   --------------------
                                                                2000        1999       2000        1999
                                                              ---------   --------   ---------   --------
                                                              (REVISED)              (REVISED)
<S>                                                           <C>         <C>        <C>         <C>
Revenues:
  Net product sales.........................................  $171,470    $139,192   $326,809    $275,541
  Net service sales.........................................    15,061      14,534     30,181      28,426
  Revenues from research and development contracts:
    Related parties.........................................       114         432        245         912
    Other...................................................        49          47         85          92
                                                              --------    --------   --------    --------
      Total revenues........................................   186,694     154,205    357,320     304,971
                                                              --------    --------   --------    --------
Operating costs and expenses:
  Cost of products sold.....................................    37,051      27,136     69,271      55,103
  Cost of services sold.....................................     8,944       9,033     17,772      17,788
  Selling, general and administrative.......................    42,972      42,333     81,194      78,058
  Research and development (including research and
    development related to contracts).......................    15,391      24,947     58,134      46,012
  Amortization of intangibles...............................     2,011       2,017      3,979       4,103
                                                              --------    --------   --------    --------
    Total operating costs and expenses......................   106,369     105,466    230,350     201,064
                                                              --------    --------   --------    --------
Operating income............................................    80,325      48,739    126,970     103,907
                                                              --------    --------   --------    --------
Other income (expenses):
  Equity in net loss of unconsolidated affiliates...........   (11,313)     (6,969)   (19,446)    (14,725)
  Minority interest.........................................     1,352         864      2,208       1,730
  Investment income.........................................     8,639       8,820     16,726      16,743
  Interest expense..........................................    (3,441)     (5,137)    (6,992)    (10,186)
  Gain on affiliate sale of stock...........................        --          --     20,270         606
  Gain on sale of product line..............................        --       7,500         --       7,500
  Gain on sale of equity securities.........................    14,165          --     14,165       1,963
  Charge for impaired investment............................        --      (5,487)        --      (5,487)
  Other.....................................................     5,174          --      5,153          --
                                                              --------    --------   --------    --------
    Total other income (expenses)...........................    14,576        (409)    32,084      (1,856)
                                                              --------    --------   --------    --------
Income before income taxes..................................    94,901      48,330    159,054     102,051
Provision for income taxes..................................   (30,911)    (20,417)   (49,755)    (40,633)
                                                              --------    --------   --------    --------
Division net income.........................................  $ 63,990    $ 27,913   $109,299    $ 61,418
                                                              ========    ========   ========    ========
Comprehensive income, net of tax:
  Division net income.......................................  $ 63,990    $ 27,913   $109,299    $ 61,418
                                                              --------    --------   --------    --------
  Other comprehensive income (loss), net of tax:
    Foreign currency translation adjustments................      (174)     (4,986)   (10,397)    (13,812)
                                                              --------    --------   --------    --------
    Unrealized gains (losses) on securities:
      Unrealized gains (losses) arising during the period...   (43,424)      1,420      6,785        (889)
      Reclassification adjustment for (gains) losses
        included in division net income.....................    (5,501)      3,169     (5,501)      1,945
                                                              --------    --------   --------    --------
    Unrealized gains (losses) on securities, net............   (48,925)      4,589      1,284       1,056
                                                              --------    --------   --------    --------
  Other comprehensive loss..................................   (49,099)       (397)    (9,113)    (12,756)
                                                              --------    --------   --------    --------
Comprehensive income........................................  $ 14,891    $ 27,516   $100,186    $ 48,662
                                                              ========    ========   ========    ========
</TABLE>


    The accompanying notes are an integral part of these unaudited, combined
                             financial statements.

                                       16
<PAGE>
                                GENZYME GENERAL
                       A DIVISION OF GENZYME CORPORATION

                            COMBINED BALANCE SHEETS

                             (AMOUNTS IN THOUSANDS)


<TABLE>
<CAPTION>
                                                               JUNE 30,     DECEMBER 31,
                                                                 2000           1999
                                                              -----------   ------------
                                                              (UNAUDITED)
                                                               (REVISED)
<S>                                                           <C>           <C>
                           ASSETS

Current assets:
  Cash and cash equivalents.................................  $  154,474     $   94,523
  Short-term investments....................................     118,650        214,240
  Accounts receivable, net..................................     153,783        141,949
  Inventories...............................................      86,138         84,384
  Prepaid expenses and other current assets.................      24,200         17,632
  Due from Genzyme Molecular Oncology.......................       4,104          3,793
  Due from Genzyme Surgical Products........................       8,368          6,406
  Due from Genzyme Tissue Repair............................         214            683
  Deferred tax assets--current..............................      40,776         41,195
                                                              ----------     ----------
    Total current assets....................................     590,707        604,805
Property, plant and equipment, net..........................     375,449        362,548
Long-term investments.......................................     312,853        205,142
Notes receivable- related party.............................      10,000          6,603
Intangibles, net............................................      71,177         75,370
Deferred tax assets--noncurrent.............................      13,319         19,844
Investment in equity securities.............................     104,458         94,719
Other.......................................................      51,639         30,552
                                                              ----------     ----------
    Total assets............................................  $1,529,602     $1,399,583
                                                              ==========     ==========

              LIABILITIES AND DIVISION EQUITY

Current liabilities:
  Accounts payable..........................................  $   16,278     $   23,229
  Accrued expenses..........................................      59,124         62,514
  Income taxes payable......................................      43,609         27,946
  Deferred revenue..........................................       3,880          3,475
  Current portion of long-term debt and capital lease
    obligations.............................................         887             80
                                                              ----------     ----------
    Total current liabilities...............................     123,778        117,244
Long-term debt and capital lease obligations................          73             --
Convertible subordinated notes and debentures...............     273,150        272,622
Other.......................................................       2,737          2,103
                                                              ----------     ----------
    Total liabilities.......................................     399,738        391,969

Division equity.............................................   1,129,864      1,007,614
                                                              ----------     ----------
Total liabilities and division equity.......................  $1,529,602     $1,399,583
                                                              ==========     ==========
</TABLE>


    The accompanying notes are an integral part of these unaudited, combined
                             financial statements.

                                       17
<PAGE>
                                GENZYME GENERAL
                       A DIVISION OF GENZYME CORPORATION

                       COMBINED STATEMENTS OF CASH FLOWS

                       (UNAUDITED, AMOUNTS IN THOUSANDS)


<TABLE>
<CAPTION>
                                                                  SIX MONTHS ENDED
                                                                      JUNE 30,
                                                              -------------------------
                                                                2000            1999
                                                              ---------       ---------
                                                              (REVISED)
<S>                                                           <C>             <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Division net income.......................................  $ 109,299       $  61,418
  Reconciliation of division net income to net cash provided
    by operating activities:
    Depreciation and amortization...........................     22,844          26,829
    Provision for bad debts.................................      4,124           8,125
    Notes received from a collaborator......................    (10,000)             --
    Equity in net loss of unconsolidated affiliates.........     19,446          14,725
    Minority interest in net loss of subsidiary.............     (2,208)         (1,730)
    Gain on affiliate sale of stock.........................    (20,270)           (606)
    Gain on sale of product line............................         --          (7,500)
    Gain on sale of equity securities.......................    (14,165)         (1,963)
    Charge for impaired investment..........................         --           5,487
    Deferred income tax expense.............................      5,882              --
    Other...................................................     (1,148)           (493)
    Increase (decrease) in cash from working capital
     changes:
      Accounts receivable...................................    (19,219)        (13,671)
      Inventories...........................................     (4,183)          3,795
      Prepaid expenses and other current assets.............     (3,529)          1,585
      Due from other Genzyme divisions......................     (1,824)         (6,580)
      Accounts payable, accrued expenses, income taxes
       payable and deferred revenue.........................     22,260          27,620
                                                              ---------       ---------
      Net cash provided by operating activities.............    107,309         117,041
                                                              ---------       ---------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Purchases of investments..................................   (239,134)       (320,388)
  Sales and maturities of investments.......................    228,343         268,007
  Proceeds from sale of equity securities...................        837          11,090
  Purchase of property, plant and equipment.................    (34,187)        (28,157)
  Investments in unconsolidated affiliates..................    (12,856)        (18,675)
  Other.....................................................      2,210           8,966
                                                              ---------       ---------
      Net cash used in investing activities.................    (54,787)        (79,157)
                                                              ---------       ---------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Allocated proceeds from issuance of Genzyme General
    Stock...................................................     28,346          31,251
  Payments of debt and capital lease obligations............         --            (643)
  Net cash allocated to Genzyme Molecular Oncology..........    (15,000)             --
  Net cash allocated to Genzyme Surgical Products...........         --         (53,163)
  Net cash allocated to Genzyme Tissue Repair...............     (4,940)        (29,984)
  Other.....................................................      2,054           3,934
                                                              ---------       ---------
      Net cash provided by (used in) financing activities...     10,460         (48,605)
                                                              ---------       ---------
Effect of exchange rate changes on cash.....................     (3,031)         (1,864)
                                                              ---------       ---------
Increase (decrease) in cash and cash equivalents............     59,951         (12,585)
Cash and cash equivalents at beginning of period............     94,523         100,012
                                                              ---------       ---------
Cash and cash equivalents at end of period..................  $ 154,474       $  87,427
                                                              =========       =========
</TABLE>


    The accompanying notes are an integral part of these unaudited, combined
                             financial statements.

                                       18
<PAGE>
                                GENZYME GENERAL
                       A DIVISION OF GENZYME CORPORATION

               NOTES TO UNAUDITED, COMBINED FINANCIAL STATEMENTS

1.  BASIS OF PRESENTATION


    The combined financial statements of Genzyme General for each period include
the balance sheets, results of operations and cash flows of the businesses we
allocate to Genzyme General. We also allocate a portion of our corporate
operations to Genzyme General using methods described in our allocation policy
below. These combined financial statements are prepared using amounts included
in our consolidated financial statements included in this Form 10-Q. We prepared
the unaudited, combined financial statements for Genzyme General following the
requirements of the SEC for interim reporting. As permitted under those rules,
certain footnotes or other financial information that are normally required by
generally accepted accounting principles can be condensed or omitted. We have
reclassified certain 1999 data to conform with our 2000 presentation.



    On June 1, 2000, Celtrix Pharmaceuticals, Inc. was acquired by Insmed Inc.
upon which our shares of Celtrix common stock were exchanged on a 1-for-1 basis
for shares of Insmed common stock. On the date of the exchange, we recognized
the unrealized gain of $7.6 million, net of tax, as a credit to division equity.
We should have recognized this gain as a realized gain and recorded such gain in
income. Accordingly, we have revised our financial statements for the three and
six months ended June 30, 2000 to reclassify the $7.6 million gain, net of tax,
from an unrealized gain to a realized gain. The impact of this revision on the
three and six months ended June 30, 2000 is as follows:



<TABLE>
<CAPTION>
                                             PREVIOUSLY REPORTED                   REVISED
                                        -----------------------------   -----------------------------
                                          3 MONTHS        6 MONTHS        3 MONTHS        6 MONTHS
                                        -------------   -------------   -------------   -------------
                                         (UNAUDITED, AMOUNTS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                     <C>             <C>             <C>             <C>
Gain on sale of equity securities.....     $  6,592        $  6,592        $ 14,165        $ 14,165
Income before income taxes............       87,328         151,481          94,901         159,054
Provision for income taxes............      (28,303)        (47,147)        (30,911)        (49,755)
Division net income...................       59,025         104,334          63,990         109,299
</TABLE>



    These financial statements include all normal and recurring adjustments that
we consider necessary for the fair presentation of Genzyme General's financial
position and operating results. Since these are interim financial statements,
you should also read the financial statements and notes for Genzyme General
included in our 1999 Form 10-K, as amended. Revenues, expenses, assets and
liabilities can vary from quarter to quarter. Therefore, the results and trends
in these interim financial statements may not be the same as those for future
periods.



    We established Genzyme Surgical Products as a separate division of Genzyme
in June 1999. The business of Genzyme Surgical Products previously operated as a
business unit of Genzyme General. These unaudited, combined financial statements
reflect the allocated financial position, results of operations and cash flows
of Genzyme General as if Genzyme Surgical Products had been accounted for as a
separate division of Genzyme for all periods presented.


                                       19
<PAGE>
                                GENZYME GENERAL
                       A DIVISION OF GENZYME CORPORATION

         NOTES TO UNAUDITED, COMBINED FINANCIAL STATEMENTS (CONTINUED)


2.  INVENTORIES (AMOUNTS IN THOUSANDS):



<TABLE>
<CAPTION>
                                                        JUNE 30,     DECEMBER 31,
                                                          2000           1999
                                                       -----------   ------------
                                                       (UNAUDITED)
<S>                                                    <C>           <C>
Raw materials........................................    $28,522        $24,057
Work-in-process......................................     37,666         40,592
Finished products....................................     19,950         19,735
                                                         -------        -------
    Total............................................    $86,138        $84,384
                                                         =======        =======
</TABLE>



3.  INTERDIVISIONAL FINANCING ARRANGEMENTS



GENZYME MOLECULAR ONCOLOGY



    In April 2000, Genzyme Molecular Oncology drew $15.0 million of cash under
its interdivisional financing arrangement with Genzyme General in exchange for
676,254 Genzyme Molecular Oncology designated shares. As required by our
charter, the number of Genzyme Molecular Oncology designated shares was
determined using the average closing price of Molecular Oncology Stock for the
20 trading days beginning on the 30th trading day before the draw. As of June
30, 2000 $15 million remained available to Genzyme Molecular Oncology under this
arrangement.



GENZYME TISSUE REPAIR



    In March 2000, Genzyme Tissue Repair made a $5.0 million draw under its
interdivisional financing arrangement with Genzyme General in exchange for
765,169 Genzyme Tissue Repair designated shares. As required by our charter, the
number of Genzyme Tissue Repair designated shares was determined by using the
average closing price of Tissue Repair Stock for the 20 trading days beginning
on the 30th trading day before the draw. As of June 30, 2000 $15 million
remained available to Genzyme Tissue Repair under this arrangement.



4.  LICENSE AND STRATEGIC ALLIANCE AGREEMENTS


    In March 2000, Genzyme General recorded $19.5 million as research and
development expense, representing the initial amounts payable to Synpac (North
Carolina), Inc. under a license granted by Synpac to Genzyme to develop and
commercialize Pompase(TM) enzyme replacement therapy for Pompe disease, which is
produced using a Chinese hamster ovary cell line. In connection with this
license, Genzyme General will pay Synpac certain amounts upon the achievement of
certain development and commercialization milestones. Genzyme General will also
pay Synpac royalties for a specified period of time based on certain percentages
of sales.

    In June 2000, Genzyme and Pharming Group N.V. entered into a strategic
alliance agreement to share in the development and funding for the
commercialization of Pompase(TM) enzyme replacement therapy. Upon execution of
the definitive agreement, Pharming paid Genzyme cash of $250,000 and issued to
Genzyme a $10.0 million 7% Convertible Senior Note due June 1, 2004 (the
"Pharming Note"). This consideration was a reimbursement for 50% of the amounts
Genzyme previously paid to Synpac for product development and technology fees
and expenses. Accordingly, Genzyme recorded the $10.3 million as a reduction to
research and development expense during the three months ended June 30, 2000.

    The Pharming Note is convertible at any time at Genzyme's option into fully
paid and nonassessable Ordinary Shares of Pharming. We have allocated our
interest in the Pharming Note to

                                       20
<PAGE>
                                GENZYME GENERAL
                       A DIVISION OF GENZYME CORPORATION

         NOTES TO UNAUDITED, COMBINED FINANCIAL STATEMENTS (CONTINUED)


4.  LICENSE AND STRATEGIC ALLIANCE AGREEMENTS (CONTINUED)

Genzyme General and have classified the Pharming Note as a long-term, related
party note receivable as of June 30, 2000.


5.  GAIN ON AFFILIATE SALE OF STOCK


    In February 2000, Genzyme Transgenics Corporation, an unconsolidated
affiliate, completed an offering of 3.5 million shares of Genzyme Transgenics
common stock, resulting in net proceeds to Genzyme Transgenics of $75.2 million
(after the exercise of the underwriter's overallotment option). In accordance
with our policy pertaining to affiliate sales of stock, we recognized a gain of
$20.3 million and recorded a net deferred tax expense of $3.9 million for the
three months ended March 31, 2000. The deferred tax expense is net of a
$3.4 million credit for the reversal of a valuation allowance on a deferred tax
asset. As a result of the issuance of the additional shares by Genzyme
Transgenics, our ownership interest in Genzyme Transgenics decreased from 33% to
28%.


6.  GAIN ON SALE OF EQUITY SECURITIES


    In June 2000, we recorded a gain of $5.5 million upon the sale of a portion
of its investment in Genzyme Transgenics common stock. The tax effect of this
gain was fully offset by the reversal of a $1.9 million valuation allowance
related to previously recognized capital losses.


7.  SETTLEMENT OF LAWSUIT


    In April 2000, we received net proceeds of approximately $5.1 million in
connection with the settlement of a lawsuit. We allocated these proceeds to
Genzyme General and recorded them as other income in Genzyme General's
unaudited, combined statements of operations for the three and six months ended
June 30, 2000. The lawsuit, initiated in 1993, pertained to an accidental spill
of Ceredase-Registered Trademark- enzyme at a fill facility operated by a
contractor to Genzyme General.


8.  TAX PROVISION



<TABLE>
<CAPTION>
                                    THREE MONTHS ENDED                   SIX MONTHS ENDED
                                         JUNE 30,         INCREASE/          JUNE 30,         INCREASE/
                                   --------------------   (DECREASE)   --------------------   (DECREASE)
                                     2000        1999      % CHANGE      2000        1999      % CHANGE
                                   ---------   --------   ----------   ---------   --------   ----------
                                   (REVISED)                           (REVISED)
                                         (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                <C>         <C>        <C>          <C>         <C>        <C>
Provision for income taxes.......  $ 30,911    $ 20,417      51%       $ 49,755    $ 40,633      22%
Effective tax rate...............    33%         42%                     31%         40%
</TABLE>


    Genzyme General's tax rates for both periods vary from the U.S. statutory
tax rate as a result of its:

    - provision for state income taxes;

    - use of a foreign sales corporation;

    - nondeductible amortization of intangibles;

    - use of tax credits; and

    - share of losses of unconsolidated affiliates.

    In the three months ended June 30, 2000 we reversed a $1.9 million valuation
allowance, which reduced our tax rate for the period by 2.2%. In the six months
ended June 30, 2000, we reversed valuation allowances totaling $5.3 million,
which reduced our tax rate for the period by 3.5%.

                                       21
<PAGE>
                                GENZYME GENERAL
                       A DIVISION OF GENZYME CORPORATION

         NOTES TO UNAUDITED, COMBINED FINANCIAL STATEMENTS (CONTINUED)


9.  SEGMENT REPORTING


    We present segment information in a manner consistent with the method we use
to report this information to our management. Genzyme General has two reportable
segments:

    - Therapeutics, which develops, manufactures and distributes human
      therapeutic products for significant unmet medical needs. The business
      derives substantially all of its revenue from sales of
      Cerezyme-Registered Trademark- enzyme; and

    - Diagnostic Products, which provides diagnostic products to niche markets
      with a focus on IN VITRO diagnostics.

    Information concerning the operations in these reportable segments is as
follows:


<TABLE>
<CAPTION>
                                       THREE MONTHS ENDED      SIX MONTHS ENDED
                                            JUNE 30,               JUNE 30,
                                      --------------------   --------------------
                                        2000        1999       2000        1999
                                      ---------   --------   ---------   --------
                                           (UNAUDITED, AMOUNTS IN THOUSANDS)
                                      (REVISED)              (REVISED)
<S>                                   <C>         <C>        <C>         <C>
Revenues:
  Therapeutics......................  $148,578    $119,223   $282,380    $234,264
  Diagnostic Products...............    15,539      14,955     30,777      29,646
  Other.............................    22,425      19,456     43,847      39,914
  Eliminations/Adjustments(1).......       152         571        316       1,147
                                      --------    --------   --------    --------
    Total...........................  $186,694    $154,205   $357,320    $304,971
                                      ========    ========   ========    ========

Division net income:
  Therapeutics......................  $ 54,252    $ 32,910   $ 83,515    $ 66,781
  Diagnostic Products...............       815       1,071      1,530       2,200
  Other.............................      (625)        187       (796)     (1,851)
  Eliminations/Adjustments(1).......     9,548      (6,255)    25,050      (5,712)
                                      --------    --------   --------    --------
    Total...........................  $ 63,990    $ 27,913   $109,299    $ 61,418
                                      ========    ========   ========    ========
</TABLE>


------------------------


(1) Includes primarily amounts related to Genzyme General's corporate research
    and development and administrative activities that we do not specifically
    allocate to a particular segment of Genzyme General. Division net income for
    the six months ended June 30, 2000 also includes a gain of $20.3 million
    relating to a public offering of common shares by Genzyme Transgenics. (See
    Note 5 above.)


    There has been no material change in segment assets since December 31, 1999.


10.  NEW ACCOUNTING PRONOUNCEMENTS



    We have included information regarding the impact that recently issued
accounting standards will have on our financial statements in Note 16., "New
Accounting Pronouncements," to our unaudited, consolidated financial statements,
which we incorporate by reference into this note.


                                       22
<PAGE>
                           GENZYME MOLECULAR ONCOLOGY
                       A DIVISION OF GENZYME CORPORATION

                       COMBINED STATEMENTS OF OPERATIONS

                       (UNAUDITED, AMOUNTS IN THOUSANDS)


<TABLE>
<CAPTION>
                                                      THREE MONTHS ENDED         SIX MONTHS ENDED
                                                           JUNE 30,                  JUNE 30,
                                                    -----------------------   -----------------------
                                                      2000           1999       2000           1999
                                                    --------       --------   --------       --------
<S>                                                 <C>            <C>        <C>            <C>
Revenues:
  Royalty and licensing revenue...................  $   963        $   335    $  3,518       $    739
  Revenue from research and development
    contracts--related party......................       --            198          --            496
  Service revenue.................................       --            600          --          1,500
  Service revenue--related party..................       --             --          --             11
                                                    -------        -------    --------       --------
    Total revenues................................      963          1,133       3,518          2,746
                                                    -------        -------    --------       --------

Operating costs and expenses:
  Cost of research and development, royalty and
    licensing revenue.............................      139            212         195            506
  Cost of service revenues........................       --            160          --            506
  Selling, general and administrative.............    1,788          1,418       2,978          3,037
  Research and development........................    4,594          4,728       8,652          8,633
  Amortization of intangibles.....................    2,464          2,957       5,420          5,913
                                                    -------        -------    --------       --------
    Total operating costs and expenses:...........    8,985          9,475      17,245         18,595
                                                    -------        -------    --------       --------
Operating loss....................................   (8,022)        (8,342)    (13,727)       (15,849)
                                                    -------        -------    --------       --------

Other income (expenses):
  Equity in net loss of joint venture.............       --           (632)         --         (1,007)
  Investment income...............................      177            154         250            317
  Interest expense................................      (70)            --        (157)            (3)
                                                    -------        -------    --------       --------
    Total other income (expenses).................      107           (478)         93           (693)
                                                    -------        -------    --------       --------
Loss before income taxes..........................   (7,915)        (8,820)    (13,634)       (16,542)
Tax benefit.......................................      552            662       1,214          1,324
                                                    -------        -------    --------       --------
Division net loss.................................  $(7,363)       $(8,158)   $(12,420)      $(15,218)
                                                    =======        =======    ========       ========

Comprehensive loss, net of tax:
  Division net loss...............................  $(7,363)       $(8,158)   $(12,420)      $(15,218)
  Other comprehensive income (loss), net of tax:
    Unrealized gains (losses) on securities
      arising during the period...................       --             --          --             --
                                                    -------        -------    --------       --------
Comprehensive loss................................  $(7,363)       $(8,158)   $(12,420)      $(15,218)
                                                    =======        =======    ========       ========
</TABLE>


    The accompanying notes are an integral part of these unaudited, combined
                             financial statements.

                                       23
<PAGE>
                           GENZYME MOLECULAR ONCOLOGY
                       A DIVISION OF GENZYME CORPORATION

                            COMBINED BALANCE SHEETS

                             (AMOUNTS IN THOUSANDS)


<TABLE>
<CAPTION>
                                                               JUNE 30,     DECEMBER 31,
                                                                 2000           1999
                                                              -----------   ------------
                                                              (UNAUDITED)
<S>                                                           <C>           <C>
                                         ASSETS

Current assets:
  Cash and cash equivalents.................................     $1,085        $3,587
  Short term investments....................................      6,876            --
  Accounts receivable.......................................        139            --
  Prepaid expenses and other current assets.................         12           218
                                                                 ------        ------
    Total current assets....................................      8,112         3,805

Equipment, net..............................................        705           467
Intangibles, net............................................         --         5,420
                                                                 ------        ------
    Total assets............................................     $8,817        $9,692
                                                                 ======        ======

                            LIABILITIES AND DIVISION EQUITY

Current liabilities:
  Accrued expenses..........................................     $  927        $  676
  Due to Genzyme General....................................      4,104         3,793
  Deferred revenue..........................................        739           225
  Current portion of long-term debt and capital lease
    obligation..............................................        105         5,000
                                                                 ------        ------
    Total current liabilities...............................      5,875         9,694

  Deferred tax liability....................................         --         1,213
  Long-term debt and capital lease obligations..............        210            --
                                                                 ------        ------
    Total liabilities.......................................      6,085        10,907

Division equity.............................................      2,732        (1,215)
                                                                 ------        ------

    Total liabilities and division equity...................     $8,817        $9,692
                                                                 ======        ======
</TABLE>


    The accompanying notes are an integral part of these unaudited, combined
                             financial statements.

                                       24
<PAGE>
                           GENZYME MOLECULAR ONCOLOGY
                       A DIVISION OF GENZYME CORPORATION

                       COMBINED STATEMENTS OF CASH FLOWS

                       (UNAUDITED, AMOUNTS IN THOUSANDS)

<TABLE>
<CAPTION>
                                                               SIX MONTHS ENDED
                                                                   JUNE 30,
                                                              -------------------
                                                                2000       1999
                                                              --------   --------
<S>                                                           <C>        <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Division net loss.........................................  $(12,420)  $(15,218)
  Reconciliation of division net loss to net cash used in
    operating activities:
    Depreciation and amortization...........................     5,499      6,059
    Equity in net loss of joint venture.....................        --      1,007
    Deferred tax benefit....................................    (1,214)    (1,324)
    Other...................................................       (86)        18
    Increase (decrease) in cash from working capital
      changes:
      Accounts receivable...................................      (139)     5,675
      Prepaid expenses and other current assets.............       206       (172)
      Accrued expenses and deferred revenue.................       765       (468)
      Due to Genzyme General................................       311       (110)
                                                              --------   --------
        Net cash used in operating activities...............    (7,078)    (4,533)
                                                              --------   --------

CASH FLOWS FROM INVESTING ACTIVITIES:
  Purchases of investments..................................    (6,790)        --
  Sales and maturities of investments.......................        --      1,022
  Acquisitions of equipment.................................        --        (43)
                                                              --------   --------
        Net cash provided by (used in) investing
          activities........................................    (6,790)       979
                                                              --------   --------

CASH FLOWS FROM FINANCING ACTIVITIES:
  Allocated proceeds from issuance of Molecular Oncology
    Stock...................................................     1,366         --
  Repayments of debt........................................    (5,000)        --
  Net cash allocated from Genzyme General...................    15,000         --
                                                              --------   --------
        Net cash provided by financing activities...........    11,366         --
                                                              --------   --------

Decrease in cash and cash equivalents.......................    (2,502)    (3,554)
Cash and cash equivalents at beginning of period............     3,587     10,868
                                                              --------   --------
Cash and cash equivalents at end of period..................  $  1,085   $  7,314
                                                              ========   ========
</TABLE>

    The accompanying notes are an integral part of these unaudited, combined
                             financial statements.

                                       25
<PAGE>
                           GENZYME MOLECULAR ONCOLOGY
                       A DIVISION OF GENZYME CORPORATION

               NOTES TO UNAUDITED, COMBINED FINANCIAL STATEMENTS

1.  BASIS OF PRESENTATION


    The combined financial statements of Genzyme Molecular Oncology for each
period include the balance sheets, results of operations and cash flows of the
businesses we allocate to Genzyme Molecular Oncology. We also allocate a portion
of our corporate operations to Genzyme Molecular Oncology using methods
described in our allocation policy below. These combined financial statements
are prepared using amounts included in our consolidated financial statements
included in this Form 10-Q. We prepared the unaudited, combined financial
statements for Genzyme Molecular Oncology following the requirements of the SEC
for interim reporting. As permitted under those rules, certain footnotes or
other financial information that are normally required by generally accepted
accounting principles can be condensed or omitted. We have reclassified certain
1999 data to conform to our 2000 presentation.



    These financial statements include all normal and recurring adjustments that
are considered necessary for the fair presentation of Genzyme Molecular
Oncology's financial position and operating results. Since these are interim
financial statements, you should also read the financial statements and notes
for Genzyme Molecular Oncology included in our 1999 Form 10-K, as amended.
Revenues, expenses, assets and liabilities can vary from quarter to quarter.
Therefore, the results and trends in these interim financial statements may not
be the same as those for future periods.



2.  REGISTRATION STATEMENTS



    In March 2000, we filed with the SEC a prospectus pursuant to Rule 424 of
the Securities Act of 1933, as amended, covering the offering of 3,000,000
shares of Molecular Oncology Stock (plus 450,000 shares issuable upon exercise
of the underwriter's over-allotment option). The proceeds of the offering were
to be allocated to Genzyme Molecular Oncology. In April 2000, in light of market
volatility and market conditions at the time, we terminated the offering of
shares of Molecular Oncology Stock contemplated by the prospectus.


    Pursuant to a prospectus filed under Rule 424 of the Securities Act of 1933,
as amended, in July 2000, we sold 1,607,400 shares of Molecular Oncology Stock
to a limited number of purchasers at a price of $12.91 per share. We received
approximately $20.7 million of net proceeds from the offering which we allocated
to Genzyme Molecular Oncology. The proceeds of this offering will be used
primarily to fund Genzyme Molecular Oncology's research, preclinical and
clinical development programs, and for its working capital and general corporate
purposes.


3.  INTERDIVISIONAL FINANCING ARRANGEMENT



    In April 2000, Genzyme Molecular Oncology drew $15.0 million of cash under
its interdivisional financing arrangement with Genzyme General in exchange for
676,254 Genzyme Molecular Oncology designated shares. As required by our
charter, the number of Genzyme Molecular Oncology designated shares was
determined using the average closing price of the Molecular Oncology Stock for
the 20 trading days beginning on the 30th trading day before the draw. These
funds will be used primarily to fund research, preclinical and clinical
development programs, and for working capital and general corporate purposes. As
of June 30, 2000, $15 million remained available to Genzyme Molecular Oncology
under this arrangement.



4.  NEW ACCOUNTING PRONOUNCEMENTS



    We have included information regarding the impact that recently issued
accounting standards will have on our financial statements in Note 16., "New
Accounting Pronouncements," to our unaudited, consolidated financial statements,
which we incorporate by reference into this note.


                                       26
<PAGE>
                           GENZYME SURGICAL PRODUCTS
                       A DIVISION OF GENZYME CORPORATION

                       COMBINED STATEMENTS OF OPERATIONS

                       (UNAUDITED, AMOUNTS IN THOUSANDS)


<TABLE>
<CAPTION>
                                                       THREE MONTHS ENDED     SIX MONTHS ENDED
                                                            JUNE 30,              JUNE 30,
                                                       -------------------   -------------------
                                                         2000       1999       2000       1999
                                                       --------   --------   --------   --------
<S>                                                    <C>        <C>        <C>        <C>
Total revenues.......................................  $ 29,969   $ 26,681   $ 59,051   $ 54,034
                                                       --------   --------   --------   --------

Operating costs and expenses:
  Cost of products sold..............................    16,592     17,439     32,631     33,283
  Selling, general and administrative................    17,042     16,492     33,442     31,779
  Research and development...........................     7,001      8,983     13,972     14,585
  Amortization of intangibles........................     1,427      1,444      2,853      2,861
                                                       --------   --------   --------   --------
    Total operating costs and expenses...............    42,062     44,358     82,898     82,508
                                                       --------   --------   --------   --------
Operating loss.......................................   (12,093)   (17,677)   (23,847)   (28,474)
                                                       --------   --------   --------   --------

Other income (expenses):
  Investment income..................................     1,709         56      3,391         63
  Interest expense...................................        (2)       (34)        (1)       (35)
  Other..............................................        19         (3)        47         43
                                                       --------   --------   --------   --------
    Total other income (expenses)....................     1,726         19      3,437         71
                                                       --------   --------   --------   --------
Division net loss....................................  $(10,367)  $(17,658)  $(20,410)  $(28,403)
                                                       ========   ========   ========   ========

Comprehensive loss, net of tax:
  Division net loss..................................  $(10,367)  $(17,658)  $(20,410)  $(28,403)
                                                       --------   --------   --------   --------
  Other comprehensive income (loss), net of tax:
    Foreign currency translation adjustments.........        31         --         31         --
    Unrealized losses on securities arising during
      the period.....................................    (7,060)      (628)    (3,782)      (628)
                                                       --------   --------   --------   --------
  Other comprehensive loss...........................    (7,029)      (628)    (3,751)      (628)
                                                       --------   --------   --------   --------
Comprehensive loss...................................  $(17,396)  $(18,286)  $(24,161)  $(29,031)
                                                       ========   ========   ========   ========
</TABLE>


    The accompanying notes are an integral part of these unaudited, combined
                             financial statements.

                                       27
<PAGE>
                           GENZYME SURGICAL PRODUCTS
                       A DIVISION OF GENZYME CORPORATION

                            COMBINED BALANCE SHEETS

                             (AMOUNTS IN THOUSANDS)

<TABLE>
<CAPTION>
                                                               JUNE 30,     DECEMBER 31,
                                                                 2000           1999
                                                              -----------   ------------
                                                              (UNAUDITED)
<S>                                                           <C>           <C>
                                         ASSETS

Current assets:
  Cash and cash equivalents.................................    $ 18,789      $ 22,673
  Short-term investments....................................      57,351        41,606
  Accounts receivable, net..................................      21,230        19,886
  Inventories...............................................      38,869        30,491
  Prepaid expenses and other current assets.................       1,124           815
                                                                --------      --------
    Total current assets....................................     137,363       115,471

Property, plant and equipment, net..........................      17,795        17,621
Long-term investments.......................................      19,750        61,846
Intangibles, net............................................     169,900       172,833
Deferred tax assets-noncurrent..............................       1,371            --
Investment in equity securities.............................       4,274         3,140
Other.......................................................       3,778            13
                                                                --------      --------
    Total assets............................................    $354,231      $370,924
                                                                ========      ========

                            LIABILITIES AND DIVISION EQUITY

Current liabilities:
  Accounts payable..........................................    $  5,360      $  3,562
  Accrued expenses..........................................       8,750         7,038
  Due to Genzyme General....................................       8,368         6,406
                                                                --------      --------
    Total current liabilities...............................      22,478        17,006

Division equity.............................................     331,753       353,918
                                                                --------      --------

    Total liabilities and division equity...................    $354,231      $370,924
                                                                ========      ========
</TABLE>

    The accompanying notes are an integral part of these unaudited, combined
                             financial statements.

                                       28
<PAGE>
                           GENZYME SURGICAL PRODUCTS
                       A DIVISION OF GENZYME CORPORATION

                       COMBINED STATEMENTS OF CASH FLOWS

                       (UNAUDITED, AMOUNTS IN THOUSANDS)

<TABLE>
<CAPTION>
                                                               SIX MONTHS ENDED
                                                                   JUNE 30,
                                                              -------------------
                                                                2000       1999
                                                              --------   --------
<S>                                                           <C>        <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Division net loss.........................................  $(20,410)  $(28,403)
  Reconciliation of division net loss to net cash used in
    operating activities:
    Depreciation and amortization...........................     4,450      3,967
    Provision for bad debts.................................       150        175
    Other...................................................       766         --
    Increase (decrease) in cash from working capital
      changes:
      Accounts receivable...................................    (1,494)    (1,073)
      Inventories...........................................    (8,378)    (7,877)
      Prepaid expenses and other current assets.............      (309)     1,470
      Accounts payable and accrued expenses.................     3,512      5,045
      Due to Genzyme General................................     1,962      1,043
                                                              --------   --------
        Net cash used in operating activities...............   (19,751)   (25,653)
                                                              --------   --------

CASH FLOWS FROM INVESTING ACTIVITIES:
  Purchases of investments..................................   (76,944)        --
  Sales and maturities of investments.......................   102,628         --
  Purchase of equity securities.............................    (5,000)        --
  Purchase of plant and equipment...........................    (1,642)    (1,646)
  Other.....................................................    (3,830)       141
                                                              --------   --------
        Net cash provided by (used in) investing
          activities........................................    15,212     (1,505)
                                                              --------   --------

CASH FLOWS FROM FINANCING ACTIVITIES:
  Allocated proceeds from issuance of Surgical Products
    Stock...................................................       625         --
  Net cash allocated from Genzyme General...................        --     53,163
                                                              --------   --------
        Net cash provided by financing activities...........       625     53,163

Effect of exchange rate changes on cash.....................        30         --
                                                              --------   --------

Increase (decrease) in cash and cash equivalents............    (3,884)    26,005
Cash and cash equivalents at beginning of period............    22,673         --
                                                              --------   --------
Cash and cash equivalents at end of period..................  $ 18,789   $ 26,005
                                                              ========   ========
</TABLE>

    The accompanying notes are an integral part of these unaudited, combined
                             financial statements.

                                       29
<PAGE>
                           GENZYME SURGICAL PRODUCTS
                       A DIVISION OF GENZYME CORPORATION

               NOTES TO UNAUDITED, COMBINED FINANCIAL STATEMENTS

1.  BASIS OF PRESENTATION

    We established Genzyme Surgical Products as a separate division of Genzyme
in June 1999. The business of Genzyme Surgical Products previously operated as a
business unit of Genzyme General. These unaudited, combined financial statements
reflect the allocated financial position, results of operations and cash flows
of Genzyme Surgical Products as if it had been separately accounted for as a
separate division of Genzyme for all periods presented.


    The combined financial statements of Genzyme Surgical Products for each
period include the balance sheets, results of operations and cash flows of the
businesses we allocate to Genzyme Surgical Products. We also allocate a portion
of our corporate operations to Genzyme Surgical Products using methods described
in our allocation policy below. These combined financial statements are prepared
using amounts included in our consolidated financial statements included in this
Form 10-Q. We prepared the unaudited, combined financial statements for Genzyme
Surgical Products following the requirements of the SEC for interim reporting.
As permitted under those rules, certain footnotes or other financial information
that are normally required by generally accepted accounting principles can be
condensed or omitted. We have reclassified certain 1999 data to conform to our
2000 presentation.



    These financial statements include all normal and recurring adjustments that
we consider necessary for the fair presentation of Genzyme Surgical Products'
financial position and operating results. Since these are interim financial
statements, you should also read the financial statements and notes for Genzyme
Surgical Products included in our 1999 Form 10-K, as amended. Revenues,
expenses, assets and liabilities can vary from quarter to quarter. Therefore,
the results and trends in these interim financial statements may not be the same
as those for future periods.



2.  INVENTORIES (AMOUNTS IN THOUSANDS)


<TABLE>
<CAPTION>
                                                        JUNE 30,     DECEMBER 31,
                                                          2000           1999
                                                       -----------   ------------
                                                       (UNAUDITED)
<S>                                                    <C>           <C>
Raw materials........................................    $20,506        $15,473
Work-in-process......................................      2,321          2,029
Finished products....................................     16,042         12,989
                                                         -------        -------
  Total..............................................    $38,869        $30,491
                                                         =======        =======
</TABLE>


3.  INVESTMENT IN FOCAL, INC.


    In April 2000, Focal, Inc. exercised its first option under the stock
purchase agreement between Genzyme and Focal. As required by the terms of this
agreement, Genzyme purchased $5.0 million of Focal common stock at a price of
$8.14 per share. We have allocated these shares to Genzyme Surgical Products. We
are committed, at Focal's option, to make future additional equity investments
of up to $10.0 million subject to certain conditions.

                                       30
<PAGE>
                           GENZYME SURGICAL PRODUCTS
                       A DIVISION OF GENZYME CORPORATION

         NOTES TO UNAUDITED, COMBINED FINANCIAL STATEMENTS (CONTINUED)


4.  SEGMENT INFORMATION


    We present segment information in a manner consistent with the method we use
to report this information to our management. Genzyme Surgical Products has two
reportable segments:

    - Cardiovascular Surgery, which includes chest drainage systems, instruments
      and closures used in coronary artery bypass, valve replacement, and other
      cardiothoracic surgeries; and

    - General Surgery, which includes surgical instruments and Sepra
      Film-Registered Trademark- bioresorbable membrane.

    Information concerning the operations in these reportable segments is as
follows:

<TABLE>
<CAPTION>
                                          THREE MONTHS ENDED     SIX MONTHS ENDED
                                               JUNE 30,              JUNE 30,
                                          -------------------   -------------------
                                            2000       1999       2000       1999
                                          --------   --------   --------   --------
                                              (UNAUDITED, AMOUNTS IN THOUSANDS)
<S>                                       <C>        <C>        <C>        <C>
Revenues:
  Cardiovascular Surgery................  $19,786    $18,047    $39,436    $37,433
  General Surgery.......................    7,372      6,238     14,361     12,135
  Other.................................    2,811      2,396      5,254      4,466
                                          -------    -------    -------    -------
    Total...............................  $29,969    $26,681    $59,051    $54,034
                                          =======    =======    =======    =======

Gross Profit:
  Cardiovascular Surgery................  $ 8,332    $ 6,556    $16,720    $15,025
  General Surgery.......................    2,966      2,046      6,529      4,449
  Other.................................    2,079        640      3,171      1,277
                                          -------    -------    -------    -------
    Total...............................  $13,377    $ 9,242    $26,420    $20,751
                                          =======    =======    =======    =======
</TABLE>


    The Other category includes amounts attributable to our products for plastic
surgery.


    There has been no material change in segment assets since December 31, 1999.

                                       31
<PAGE>
                           GENZYME SURGICAL PRODUCTS
                       A DIVISION OF GENZYME CORPORATION

         NOTES TO UNAUDITED, COMBINED FINANCIAL STATEMENTS (CONTINUED)


5.  ACQUISITION OF BIOMATRIX, INC. AND FORMATION OF GENZYME BIOSURGERY



    In March 2000, we entered into an agreement to acquire Biomatrix, Inc. Upon
the effectiveness of our Registration Statement on Form S-4 and completion of
the merger, we will form a new operating division called Genzyme Biosurgery and
create a new series of common stock that is intended to reflect its value and
track its performance. We refer to this stock as "Biosurgery Stock." In
connection with the merger, and upon Genzyme shareholder approval, the assets
and liabilities allocated to Genzyme Surgical Products and Genzyme Tissue Repair
will be re-allocated to Genzyme Biosurgery and shares of Surgical Products Stock
and Tissue Repair Stock will be exchanged for Biosurgery Stock. We will account
for the acquisition of Biomatrix as a purchase.



    Biomatrix stockholders will receive $37.00 in cash, one share of Biosurgery
Stock or a combination of cash and stock for each share of Biomatrix common
stock they hold. The merger agreement provides that we will pay cash for up to
28.38% of the outstanding shares of Biomatrix common stock that receive merger
consideration, or up to approximately $245.0 million.


    Holders of Surgical Products Stock will receive 0.6060 share of Biosurgery
Stock in exchange for each share of Surgical Products Stock they hold and
holders of Tissue Repair Stock will receive 0.3352 share of Biosurgery Stock in
exchange for each share of Tissue Repair Stock they hold.

    For more information about the merger and the merger consideration, we
encourage you to carefully read the Pre-Effective Amendment No. 1 to our
Registration Statement on Form S-4 filed with the SEC on July 3, 2000.


6.  NEW ACCOUNTING PRONOUNCEMENTS



    We have included information regarding the impact that recently issued
accounting standards will have on our financial statements in Note 16., "New
Accounting Pronouncements," to our unaudited, consolidated financial statements,
which we incorporate by reference into this note.


                                       32
<PAGE>
                             GENZYME TISSUE REPAIR
                       A DIVISION OF GENZYME CORPORATION

                       COMBINED STATEMENTS OF OPERATIONS

                       (UNAUDITED, AMOUNTS IN THOUSANDS)


<TABLE>
<CAPTION>
                                                             THREE MONTHS
                                                                 ENDED           SIX MONTHS ENDED
                                                               JUNE 30,              JUNE 30,
                                                          -------------------   -------------------
                                                            2000       1999       2000       1999
                                                          --------   --------   --------   --------
<S>                                                       <C>        <C>        <C>        <C>
Total revenues..........................................  $ 6,287    $ 4,665    $12,154    $  8,688
                                                          -------    -------    -------    --------

Operating costs and expenses:
  Cost of services sold.................................    3,023      3,221      6,046       6,219
  Selling, general and administrative...................    5,626      6,115     11,365      12,429
  Research and development..............................    1,452      2,003      3,323       3,971
                                                          -------    -------    -------    --------
    Total operating costs and expenses..................   10,101     11,339     20,734      22,619
                                                          -------    -------    -------    --------

Operating loss..........................................   (3,814)    (6,674)    (8,580)    (13,931)
                                                          -------    -------    -------    --------

Other income (expenses):
  Equity in net loss of joint venture...................       --     (1,361)        --      (3,368)
  Investment income.....................................      106         72        208         165
  Interest expense......................................     (323)      (419)      (625)       (864)
  Other.................................................       --         --         (5)         --
                                                          -------    -------    -------    --------
    Total other income (expenses).......................     (217)    (1,708)      (422)     (4,067)
                                                          -------    -------    -------    --------

Division net loss.......................................  $(4,031)   $(8,382)   $(9,002)   $(17,998)
                                                          =======    =======    =======    ========

Comprehensive loss, net of tax:
  Division net loss.....................................  $(4,031)   $(8,382)   $(9,002)   $(17,998)
  Other comprehensive income (loss), net of tax:
    Foreign currency translation adjustments............       11         --         11          --
                                                          -------    -------    -------    --------
  Other comprehensive income............................       11         --         11          --
                                                          -------    -------    -------    --------
Comprehensive loss......................................  $(4,020)   $(8,382)   $(8,991)   $(17,998)
                                                          =======    =======    =======    ========
</TABLE>


    The accompanying notes are an integral part of these unaudited, combined
                             financial statements.

                                       33
<PAGE>
                             GENZYME TISSUE REPAIR
                       A DIVISION OF GENZYME CORPORATION

                            COMBINED BALANCE SHEETS

                             (AMOUNTS IN THOUSANDS)


<TABLE>
<CAPTION>
                                                               JUNE 30,     DECEMBER 31,
                                                                 2000           1999
                                                              -----------   ------------
                                                              (UNAUDITED)
<S>                                                           <C>           <C>
                                         ASSETS

Current assets:
  Cash and cash equivalents.................................    $ 4,382        $ 9,373
  Accounts receivable, net..................................      5,795          4,968
  Inventories...............................................      2,340          2,394
  Other current assets......................................        384            253
                                                                -------        -------
    Total current assets....................................     12,901         16,988

Property, plant and equipment, net..........................      2,099          2,545
Other.......................................................        101            115
                                                                -------        -------
    Total assets............................................    $15,101        $19,648
                                                                =======        =======

                            LIABILITIES AND DIVISION EQUITY

Current liabilities:
  Accounts payable..........................................    $   449        $ 1,062
  Accrued expenses..........................................      2,873          3,131
  Due to Genzyme General....................................        214            683
                                                                -------        -------
    Total current liabilities...............................      3,536          4,876

Long-term debt..............................................     18,000         18,000
Other.......................................................        152            227
                                                                -------        -------
    Total liabilities.......................................     21,688         23,103

Division equity.............................................     (6,587)        (3,455)
                                                                -------        -------
    Total liabilities and division equity...................    $15,101        $19,648
                                                                =======        =======
</TABLE>


    The accompanying notes are an integral part of these unaudited, combined
                             financial statements.

                                       34
<PAGE>
                             GENZYME TISSUE REPAIR
                       A DIVISION OF GENZYME CORPORATION

                       COMBINED STATEMENTS OF CASH FLOWS

                       (UNAUDITED, AMOUNTS IN THOUSANDS)

<TABLE>
<CAPTION>
                                                               SIX MONTHS ENDED
                                                                   JUNE 30,
                                                              -------------------
                                                                2000       1999
                                                              --------   --------
<S>                                                           <C>        <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Division net loss.........................................  $ (9,002)  $(17,998)
  Reconciliation of division net loss to net cash used in
    operating activities:
    Depreciation and amortization...........................       515        682
    Provision for bad debts.................................        37         --
    Equity in net loss of joint venture.....................        --      3,368
    Other...................................................       215        (75)
    Increase (decrease) in cash from working capital
      changes:
      Accounts receivable...................................      (866)      (208)
      Inventories...........................................        54        (13)
      Other current assets..................................      (132)       739
      Accounts payable and accrued expenses.................      (890)      (484)
      Due to Genzyme General................................      (449)     5,647
                                                              --------   --------
        Net cash used in operating activities...............   (10,518)    (8,342)
                                                              --------   --------

CASH FLOWS FROM INVESTING ACTIVITIES:
  Investment in joint venture...............................        --     (3,594)
  Purchase of plant and equipment...........................       (30)      (564)
  Other.....................................................        13         34
                                                              --------   --------
        Net cash used in investing activities...............       (17)    (4,124)
                                                              --------   --------

CASH FLOWS FROM FINANCING ACTIVITIES:
  Allocated proceeds from issuance of Tissue Repair Stock,
    net.....................................................       628        221
  Payments of debt and capital lease obligations............        --       (148)
  Cash allocated from Genzyme General.......................     4,940     29,984
                                                              --------   --------
        Net cash provided by financing activities...........     5,568     30,057
                                                              --------   --------

Effect of exchange rates on cash............................       (24)        --
                                                              --------   --------
Increase (decrease) in cash and cash equivalents............    (4,991)    17,591
Cash and cash equivalents at beginning of period............     9,373      7,732
                                                              --------   --------
Cash and cash equivalents at end of period..................  $  4,382   $ 25,323
                                                              ========   ========
</TABLE>

    The accompanying notes are an integral part of these unaudited, combined
                             financial statements.

                                       35
<PAGE>
                             GENZYME TISSUE REPAIR
                       A DIVISION OF GENZYME CORPORATION

               NOTES TO UNAUDITED, COMBINED FINANCIAL STATEMENTS

1.  BASIS OF PRESENTATION


    The combined financial statements of Genzyme Tissue Repair for each period
include the balance sheets, results of operations and cash flows of the
businesses we allocate to Genzyme Tissue Repair. We also allocate a portion of
our corporate operations to Genzyme Tissue Repair using methods described in our
allocation policy below. These combined financial statements are prepared using
amounts included in our consolidated financial statements included in this Form
10-Q. We prepared the unaudited, combined financial statements for Genzyme
Tissue Repair following the requirements of the SEC for interim reporting. As
permitted under those rules, certain footnotes or other financial information
that are normally required by generally accepted accounting principles can be
condensed or omitted. We have reclassified certain 1999 data to conform to our
2000 presentation.



    These financial statements include all normal and recurring adjustments that
we consider necessary for the fair presentation of Genzyme Tissue Repair's
financial position and operating results. Since these are interim financial
statements, you should also read the financial statements and notes for Genzyme
Tissue Repair included in our 1999 Form 10-K, as amended. Revenues, expenses,
assets and liabilities can vary from quarter to quarter. Therefore, the results
and trends in these interim statements may not be the same as those for future
periods.



2.  INVENTORIES (AMOUNTS IN THOUSANDS):



<TABLE>
<CAPTION>
                                                        JUNE 30,     DECEMBER 31,
                                                          2000           1999
                                                       -----------   ------------
                                                       (UNAUDITED)
<S>                                                    <C>           <C>
Raw materials........................................     $  527        $  428
Work-in-process......................................      1,761         1,938
Finished goods.......................................         52            28
                                                          ------        ------
  Total..............................................     $2,340        $2,394
                                                          ======        ======
</TABLE>



3.  DIACRIN JOINT VENTURE



    In May 1999, we re-allocated our ownership interest in Diacrin/Genzyme LLC,
our joint venture with Diacrin, Inc., to develop and commercialize products
using porcine fetal cells for the treatment of Parkinson's and Huntington's
diseases, from Genzyme Tissue Repair to Genzyme General in exchange for
$25.0 million in cash. In connection with the re-allocation, it was agreed that
Genzyme Tissue Repair would be required to pay to Genzyme General $20.0 million
plus accrued interest at an annual rate of 13.5% if the joint venture had not
initiated a phase 3 clinical trial of NeuroCell-TM--PD by June 30, 2000. In
June 2000, our board of directors extended the milestone timeline to initiate a
phase 3 clinical trial of NeuroCell-TM--PD from June 30, 2000 to December 31,
2000. The milestone date and related financial obligation were extended to allow
additional time to review data from the current blinded phase 2 clinical trial.
If the milestone is not met, any required refund may be paid to Genzyme General
in cash, Genzyme Tissue Repair designated shares, or a combination of both, at
Genzyme Tissue Repair's option.


                                       36
<PAGE>
                             GENZYME TISSUE REPAIR
                       A DIVISION OF GENZYME CORPORATION

         NOTES TO UNAUDITED, COMBINED FINANCIAL STATEMENTS (CONTINUED)


4.  INTERDIVISIONAL FINANCING ARRANGEMENT



    In March 2000, Genzyme Tissue Repair made a $5.0 million draw under its
interdivisional financing arrangement with Genzyme General in exchange for
765,169 Genzyme Tissue Repair designated shares. As required by our charter, the
number of Genzyme Tissue Repair designated shares was determined by using the
average closing price of the Tissue Repair Stock for the 20 trading days
beginning on the 30th trading day before the draw. The funds will be used for
Genzyme Tissue Repair's operating needs. As of June 30, 2000 $15 million
remained available to Genzyme Tissue Repair under this arrangement.



5.  ACQUISITION OF BIOMATRIX, INC. AND FORMATION OF GENZYME BIOSURGERY



    In March 2000, we entered into an agreement to acquire Biomatrix, Inc. Upon
the effectiveness of our Registration Statement on Form S-4 and completion of
the merger, we will form a new operating division called Genzyme Biosurgery and
create a new series of common stock that is intended to reflect its value and
track its performance. We refer to this stock as "Biosurgery Stock." In
connection with the merger, and upon Genzyme Shareholder approval, the assets
and liabilities allocated to Genzyme Surgical Products and Genzyme Tissue Repair
will be re-allocated to Genzyme Biosurgery and shares of Surgical Products Stock
and Tissue Repair Stock will be exchanged for Biosurgery Stock. We will account
for the acquisition of Biomatrix as a purchase.



    Biomatrix stockholders will receive $37.00 in cash, one share of Biosurgery
Stock or a combination of cash and stock for each share of Biomatrix common
stock they hold. The merger agreement provides that we will pay cash for up to
28.38% of the outstanding shares of Biomatrix common stock that receive merger
consideration, or up to approximately $245.0 million.


    Holders of Surgical Products Stock will receive 0.6060 share of Biosurgery
Stock in exchange for each share of Surgical Products Stock they hold and
holders of Tissue Repair Stock will receive 0.3352 share of Biosurgery Stock in
exchange for each share of Tissue Repair Stock they hold.

    For more information about the merger and the merger consideration, we
encourage you to carefully read the Pre-Effective Amendment No. 1 to our
Registration Statement on Form S-4 filed with the SEC on July 3, 2000.


6.  NEW ACCOUNTING PRONOUNCEMENTS



    We have included information regarding the impact that recently issued
accounting standards will have on our financial statements in Note 16., "New
Accounting Pronouncements," to our unaudited, consolidated financial statements,
which we incorporate by reference into this note.


                                       37
<PAGE>
ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
         OF OPERATIONS


    This discussion contains forward-looking statements. These forward-looking
statements represent the expectations of our management as of the filing date of
this report. Actual results could differ materially from those anticipated by
the forward-looking statements due to the risks and uncertainties described in
Exhibit 99.2, "Factors Affecting Future Operating Results," to our 1999
Form 10-K. You should consider carefully each of these risks and uncertainties
in evaluating our financial condition and results of operations.


    We are a biotechnology company that develops innovative products and
services for significant unmet medical needs. We have four operating divisions:

    - Genzyme General, which develops and markets:

       - therapeutic products, with an expanding focus on products to treat
         patients suffering from lysosomal storage disorders and other specialty
         therapeutics;

       - diagnostic products, with a focus on IN VITRO diagnostics; and

       - other products and services, such as genetic testing services and
         lipids and peptides for drug delivery.

    - Genzyme Molecular Oncology, which is developing cancer products, with a
      focus on therapeutic vaccines and angiogenesis inhibitors;

    - Genzyme Surgical Products, which develops, manufactures and markets
      surgical products for cardiovascular surgery and general surgery; and

    - Genzyme Tissue Repair, which develops and markets biological products for
      orthopedic injuries, such as cartilage damage, and severe burns.

    In June 1997, we formed Genzyme Molecular Oncology as a separate division of
Genzyme by acquiring PharmaGenics, Inc. and combining it with several of our
ongoing programs in the field of oncology.


    In June 1999, we established Genzyme Surgical Products. The business of
Genzyme Surgical Products previously operated as a business unit of Genzyme
General. The discussion that follows reflects the results of operations as if
Genzyme Surgical Products had existed as a separate division of Genzyme for all
periods presented.



    The greater segregation of assets, liabilities and earnings (losses)
resulting from the creation of Genzyme Molecular Oncology and Genzyme Surgical
Products is a trend that we do not expect to continue. As discussed below,
Genzyme Surgical Products and Genzyme Tissue Repair will be combined into
Genzyme Biosurgery upon the completion of the Biomatrix acquisition, reducing
the segregation of assets among our divisions and reducing the series of common
stock outstanding. As market or competitive conditions warrant, we may create
new series of tracking stock or change our earnings allocation methodology.
However, at the present time, we have no plans to do so.



    We prepare the financial statements of Genzyme in accordance with generally
accepted accounting principles. We present financial information and accounting
policies specific to Genzyme in Exhibit 99.1 to our 1999 Form 10-K.



    We have four series of common stock--Genzyme General Stock, Molecular
Oncology Stock, Surgical Products Stock and Tissue Repair Stock--which we refer
to as "tracking stock." Unlike typical common stock, each of our tracking stocks
is designed to track the financial performance of a specific subset of our
business operations and its allocated assets, rather than operations and assets
of our entire company. The chief mechanisms intended to cause each tracking
stock to "track" the financial


                                       38
<PAGE>

performance of each division are provisions in our charter governing dividends
and distributions. Under these provisions, our charter:



    - factors the assets and liabilities and income or losses attributable to a
      division into the determination of the amount available to pay dividends
      on the associated tracking stock; and



    - requires us to exchange, redeem or distribute a dividend to the holders of
      Molecular Oncology Stock, Surgical Products Stock, or Tissue Repair Stock
      if all or substantially all of the assets allocated to those corresponding
      divisions are sold to a third party (a dividend or redemption payment must
      equal in value the net after-tax proceeds from the sale; an exchange must
      be for Genzyme General Stock at a 10% premium to the exchanged stock's
      average market price following the announcement of the sale.)



    To determine earnings per share, we allocate Genzyme's earnings to each
series of our common stock based on the earnings attributable to that series of
stock. The earnings attributable to each series of stock is defined in our
charter as the net income or loss of the corresponding division determined in
accordance with generally accepted accounting principles and as adjusted for tax
benefits allocated to or from the division in accordance with our management and
accounting policies. Our charter also requires that all income and expenses of
Genzyme be allocated among the divisions in a reasonable and consistent manner.
However, subject to fiduciary duties, our board of directors can, at its
discretion, change the methods of allocating earnings to each series of common
stock. We intend to allocate earnings using our current methods for the
foreseeable future. See "Earnings Allocation" below.



    Because the earnings allocated to each series of stock are based on the
income or losses attributable to each corresponding division, we include
financial statements and management's discussion and analysis of Genzyme
Corporation and of each division to aid investors in evaluating Genzyme's
performance and the performance of each of its divisions.



    While each tracking stock is designed to reflect a division's performance,
it is common stock of Genzyme Corporation and not of a division; each division
is not a company or legal entity, and therefore does not and cannot issue stock.
Consequently, holders of a series of tracking stock have no specific rights to
assets allocated to the corresponding division. Genzyme Corporation continues to
hold title to all of the assets allocated to each division and is responsible
for all of its liabilities, regardless of what we deem for financial statement
presentation purposes as allocated to any division. Holders of each tracking
stock, as common stockholders, are therefore subject to the risks of investing
in the businesses, assets and liabilities of Genzyme as a whole. For instance,
the assets allocated to each division are subject to company-wide claims of
creditors, product liability plaintiffs and stockholder litigation. Also, in the
event of a Genzyme liquidation, insolvency or similar event, holders of each
tracking stock would only have the rights of common stockholders in the combined
assets of Genzyme.



    We provide separate financial statements for each of our divisions as well
as consolidated financial statements that include the consolidated results of
each of our divisions and our corporate operations taken as a whole. You should
read this discussion and analysis of our financial position and results of
operations in conjunction with those unaudited, consolidated financial
statements and related notes, which are included in this report.



    In March 2000, we entered into an agreement to acquire Biomatrix, Inc. Upon
completion of the acquisition, we will form a new operating division, and the
assets and liabilities allocated to Genzyme Surgical Products and Genzyme Tissue
Repair will be re-allocated to that new division. For more information you
should read the section entitled "Liquidity and Capital Resources" below.


                                       39
<PAGE>
A.  RESULTS OF OPERATIONS

                              GENZYME CORPORATION

    The components of our consolidated statements of operations are described in
the following table:


<TABLE>
<CAPTION>
                                   THREE MONTHS ENDED                   SIX MONTHS ENDED
                                        JUNE 30,         INCREASE/          JUNE 30,         INCREASE/
                                  --------------------   (DECREASE)   --------------------   (DECREASE)
                                    2000        1999      % CHANGE      2000        1999      % CHANGE
                                  ---------   --------   ----------   ---------   --------   ----------
                                  (REVISED)                           (REVISED)
                                        (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                               <C>         <C>        <C>          <C>         <C>        <C>
Total revenues..................  $223,913    $186,684         20%    $432,043    $370,428         17%
                                  --------    --------                --------    --------

Cost of products and services
  sold..........................    65,610      56,989         15%     125,720     112,888         11%
Selling, general and
  administrative................    67,428      66,358          2%     128,979     125,303          3%
Research and development
  (including research and
  development related to
  contracts)....................    28,577      40,873       (30)%      84,276      73,707         14%
Amortization of intangibles.....     5,684       6,166        (8)%      11,782      12,373        (5)%
                                  --------    --------                --------    --------
    Total operating costs and
      expenses..................   167,299     170,386        (2)%     350,757     324,271          8%
                                  --------    --------                --------    --------
Operating income................    56,614      16,298        247%      81,286      46,157         76%
Other income (expense), net.....    16,192      (2,576)       729%      35,192      (6,545)       638%
                                  --------    --------                --------    --------
Income before income taxes......    72,806      13,722        431%     116,478      39,612        194%
Provision for income taxes......   (23,314)     (7,431)       214%     (35,168)    (17,264)       104%
                                  --------    --------                --------    --------
Net income......................  $ 49,492    $  6,291        687%    $ 81,310    $ 22,348        264%
                                  ========    ========                ========    ========
</TABLE>


REVENUES

<TABLE>
<CAPTION>
                                  THREE MONTHS ENDED                  SIX MONTHS ENDED
                                       JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                  -------------------   (DECREASE)   -------------------   (DECREASE)
                                    2000       1999      % CHANGE      2000       1999      % CHANGE
                                  --------   --------   ----------   --------   --------   ----------
                                       (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                               <C>        <C>        <C>          <C>        <C>        <C>
Product revenue.................  $201,439   $165,873         21%    $385,860   $329,575         17%
Service revenue.................    21,347     19,799          8%      42,313     38,529         10%
                                  --------   --------                --------   --------
    Total product and service
      revenue...................   222,786    185,672         20%     428,173    368,104         16%
Research and development
  revenue.......................     1,127      1,012         11%       3,870      2,324         67%
                                  --------   --------                --------   --------
    Total revenues..............  $223,913   $186,684         20%    $432,043   $370,428         17%
                                  ========   ========                ========   ========
</TABLE>

                                       40
<PAGE>
PRODUCT REVENUE:


<TABLE>
<CAPTION>
                                          THREE MONTHS ENDED                  SIX MONTHS ENDED
                                               JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                          -------------------   (DECREASE)   -------------------   (DECREASE)
                                            2000       1999      % CHANGE      2000       1999      % CHANGE
                                          --------   --------   ----------   --------   --------   ----------
                                               (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                       <C>        <C>        <C>          <C>        <C>        <C>
Genzyme General:
  Therapeutics:
    Cerezyme-Registered Trademark-/Ceredase-Registered Trademark-
      enzyme............................  $134,854   $116,904       15%      $263,460   $230,658        14%
    Renagel-Registered Trademark-
      Capsules..........................    10,218         --      100%        10,218         --       100%
    Thyrogen-Registered Trademark-
      hormone...........................     3,506      2,319       51%         6,867      3,606        90%
    Other therapeutic products..........        --         --       --          1,835         --       100%
                                          --------   --------                --------   --------
      Total Therapeutics................   148,578    119,223       25%       282,380    234,264        21%

  Diagnostic Products...................    15,539     14,955        4%        30,777     29,646         4%
  Other.................................     7,353      5,014       47%        13,652     11,631        17%
                                          --------   --------                --------   --------
    Total product revenue--Genzyme
      General...........................   171,470    139,192       23%       326,809    275,541        19%
  Genzyme Surgical Products:
    Cardiovascular......................    19,786     18,047       10%        39,436     37,433         5%
    General Surgery.....................     7,372      6,238       18%        14,361     12,135        18%
    Other...............................     2,811      2,396       17%         5,254      4,466        18%
                                          --------   --------                --------   --------
    Total product revenue--Genzyme
      Surgical Products.................    29,969     26,681       12%        59,051     54,034         9%
                                          --------   --------                --------   --------
Total product revenue...................  $201,439   $165,873       21%      $385,860   $329,575        17%
                                          ========   ========                ========   ========
</TABLE>


    We derive product revenue from sales by Genzyme General of therapeutic and
diagnostic products and sales by Genzyme Surgical Products of cardiovascular and
general surgery products. Our increase in product revenue during both periods is
largely due to increased sales of Cerezyme-Registered Trademark- enzyme, which
is a therapy for the treatment of Gaucher disease. The increase in sales of
Cerezyme-Registered Trademark- enzyme is attributable to our identification of
new Gaucher disease patients throughout the world and strong international
sales. We also sell Ceredase-Registered Trademark- enzyme for the treatment of
Gaucher disease, but we have successfully converted virtually all Gaucher
disease patients to a treatment regimen using Cerezyme-Registered Trademark-
enzyme.

    Our results of operations are highly dependent on sales of
Cerezyme-Registered Trademark- enzyme, and a reduction in revenue from sales of
this product would adversely affect our results of operations.

    The following table provides information regarding the growth in sales of
our Gaucher disease therapies as a percentage of total product revenue during
both periods.

<TABLE>
<CAPTION>
                                                      THREE MONTHS ENDED     SIX MONTHS ENDED
                                                           JUNE 30,              JUNE 30,
                                                      -------------------   -------------------
                                                        2000       1999       2000       1999
                                                      --------   --------   --------   --------
                                                                     (UNAUDITED)
<S>                                                   <C>        <C>        <C>        <C>
% of total product revenue..........................       67%        70%        68%        70%
</TABLE>

    Genzyme General began recording revenues from Renagel-Registered Trademark-
Capsules (sevelamer hydrochloride) during the second quarter of 2000 under an
amended distribution arrangement with its joint venture partner, GelTex
Pharmaceuticals, Inc. Revenues from Renagel-Registered Trademark- Capsules were
previously recorded by the joint venture. Renagel-Registered Trademark- Capsules
are used to reduce serum phosphorus levels in patients with end-stage renal
disease on dialysis.

                                       41
<PAGE>
    Sales of Thyrogen-Registered Trademark- hormone, which is an adjunctive
diagnostic tool for well differentiated thyroid cancer, increased in the three
and six months ended June 30, 2000 due to increased market penetration. We
commenced commercial sales of Thyrogen-Registered Trademark- hormone in January
1999.

    Diagnostics revenues within Genzyme General increased during both periods
due primarily to increased sales of HDL and LDL cholesterol testing products,
despite the sale of our bioreagent and ELISA product lines in July 1999.
Diagnostics' product revenue includes royalties on product sales by Techne
Corporation's biotechnology group.

    Genzyme Surgical Products cardiovascular surgery products include chest
drainage and fluid management systems, surgical closures, biomaterials, and
instruments for conventional and minimally invasive cardiac surgery. The
increase in cardiovascular surgery products revenues for both periods is
primarily attributable to increased sales of instruments for minimally invasive
cardiac surgery. Additionally, a slight increase in sales of fluid management
products contributed to the overall increase in cardiovascular surgery products
revenue growth.

    Genzyme Surgical Products also experienced an increase in general surgery
products revenue for both periods, which is due primarily to an increase in
sales of Sepra Film-Registered Trademark- bioresorbable membrane. Sales of Sepra
products for the three months ended June 30, 2000 were $4.3 million compared to
$3.5 million in the same period in 1999. Sales of Sepra products for the six
months ended June 30, 2000 were $8.2 million compared to $6.4 million in the
same period of 1999. An increase in general surgery instrument sales also
contributed to the overall increase in general surgery product revenue.

SERVICE REVENUE:


<TABLE>
<CAPTION>
                                            THREE MONTHS ENDED                  SIX MONTHS ENDED
                                                 JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                            -------------------   (DECREASE)   -------------------   (DECREASE)
                                              2000       1999      % CHANGE      2000       1999      % CHANGE
                                            --------   --------   ----------   --------   --------   ----------
                                                 (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                         <C>        <C>        <C>          <C>        <C>        <C>
Genzyme General:
  Genetic testing.........................  $15,061    $14,534          4%     $30,181    $28,426          6%
                                            -------    -------                 -------    -------
Genzyme Molecular Oncology:
  Genomics and gene expression............       --        600       (100)%         --      1,500       (100)%
                                            -------    -------                 -------    -------
Genzyme Tissue Repair:
  Carticel-Registered Trademark-
    Chondrocytes..........................    4,577      3,798         21%       9,109      6,740         35%
  Epicel-TM- Skin Grafts..................    1,709        867         97%       3,023      1,863         62%
                                            -------    -------                 -------    -------
    Total service revenue
      Genzyme Tissue Repair...............    6,286      4,665         35%      12,132      8,603         41%
                                            -------    -------                 -------    -------
Total service revenue.....................  $21,347    $19,799          8%     $42,313    $38,529         10%
                                            =======    =======                 =======    =======
</TABLE>


    Our service revenues increased during both periods as a result of increases
in sales of Carticel-Registered Trademark- chondrocytes for the treatment of
cartilage damage and Epicel-TM- skin grafts for the treatment of severe burns as
well as increased revenue from genetic testing. The increase in genetic testing
service revenue during both periods is a result of growth in sales of our DNA
and cancer testing services. These increases were partially offset by a decrease
in genomics service revenue for both periods as a result of lower sales volume.

                                       42
<PAGE>
RESEARCH AND DEVELOPMENT REVENUE:

<TABLE>
<CAPTION>
                                           THREE MONTHS ENDED                  SIX MONTHS ENDED
                                                JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                           -------------------   (DECREASE)   -------------------   (DECREASE)
                                             2000       1999      % CHANGE      2000       1999      % CHANGE
                                           --------   --------   ----------   --------   --------   ----------
                                                (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                        <C>        <C>        <C>          <C>        <C>        <C>
Genzyme General..........................   $  163     $  479        (66)%     $  330     $1,004        (67)%
Genzyme Molecular Oncology...............      963        533         81%       3,518      1,235        185%
Genzyme Tissue Repair....................        1         --        100%          22         85        (74)%
                                            ------     ------                  ------     ------
Total research and development revenue...   $1,127     $1,012         11%      $3,870     $2,324         67%
                                            ======     ======                  ======     ======
</TABLE>

    Our research and development revenue increased during both periods due to an
increase in licensing revenue. Genzyme Molecular Oncology recognized licensing
revenue in the first six months of 2000 as a result of a $2.0 million
development milestone payment received in connection with the advancement by
Schering-Plough Corporation of the p53 tumor suppressor gene in ovarian cancer
clinical trials.

    The increase in research and development revenue was partially offset by a
decrease in revenue related to StressGen/Genzyme LLC, our joint venture with
StressGen Biotechnologies Corporation and the Canadian Medical Discoveries
Fund, Inc. to develop stress gene therapies for the treatment of cancer. This
joint venture was dissolved at the end of 1999. The research and development
revenues for both periods of 1999 included work performed by Genzyme Molecular
Oncology on behalf of the joint venture for which there was no comparable amount
in the same periods of 2000.

INTERNATIONAL PRODUCT AND SERVICE SALES:

    A substantial portion of our revenue is generated outside of the United
States, as described in the following table. Most of these revenues are
attributable to sales of Cerezyme-Registered Trademark- enzyme.


<TABLE>
<CAPTION>
                                    THREE MONTHS ENDED                  SIX MONTHS ENDED
                                         JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                    -------------------   (DECREASE)   -------------------   (DECREASE)
                                      2000       1999      % CHANGE      2000       1999      % CHANGE
                                    --------   --------   ----------   --------   --------   ----------
                                         (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                 <C>        <C>        <C>          <C>        <C>        <C>
Total international product and
  service revenue.................  $88,410    $76,864       15%       $175,187   $149,200      17%
% of total product and service
  revenue.........................      40%        41%                      41%        41%
</TABLE>


MARGINS

<TABLE>
<CAPTION>
                                  THREE MONTHS ENDED                  SIX MONTHS ENDED
                                       JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                  -------------------   (DECREASE)   -------------------   (DECREASE)
                                    2000       1999      % CHANGE      2000       1999      % CHANGE
                                  --------   --------   ----------   --------   --------   ----------
                                       (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                               <C>        <C>        <C>          <C>        <C>        <C>
Product margin..................  $147,796   $121,298      22%       $283,958   $241,189      18%
% of product revenue............       73%        73%                     74%        73%

Service margin..................     9,380      7,385      27%         18,495     14,027      32%
% of service revenue............       44%        37%                     44%        36%

Total gross margin..............  $157,176   $128,683      22%       $302,453   $255,216      19%
% of total product and service
  revenue.......................       71%        69%                     71%        69%
</TABLE>

                                       43
<PAGE>
    We provide a broad range of health care products and services. As a result,
our gross margins vary significantly based on the category of product or
service. Sales of therapeutic products, including Cerezyme-Registered Trademark-
enzyme, result in higher margins than sales of surgical and diagnostic products.

    Our service margin increased during both periods. These increases are
attributable to:

    - an increase in sales of DNA and cancer testing services;

    - increased sales of Carticel-Registered Trademark- chondrocytes and
      Epicel-TM- skin grafts; and

    - a reduction in labor, materials and production costs for
      Carticel-Registered Trademark- chondrocytes and Epicel-TM- skin grafts.

    The increases were partially offset, however, by reduced margins from our
genomics services business due to lower sales volume.

OPERATING EXPENSE

    The increase in selling, general and administrative expenses in both periods
is related to:

    - increased staffing to support the growth in several of Genzyme General's
      product lines;

    - increased expenditures to support the increased sales of
      Cerezyme-Registered Trademark- enzyme and Thyrogen-Registered Trademark-
      hormone; and

    - increased spending for marketing of Genzyme Surgical Products'
      cardiovascular products, primarily the minimally invasive cardiac surgery
      instrument line.

    The increase in selling general and administrative expenses were partially
offset in both periods by the following:

    - efforts by Genzyme Tissue Repair to streamline its operations; and

    - continued expense control efforts at Genzyme Molecular Oncology.

    The decrease in research and development expense for the second quarter of
2000 as compared to the second quarter of 1999 is a result of a $10.3 million
research and development reimbursement from Pharming Group N.V. representing
Pharming's share of amounts we previously paid to Synpac (North Carolina), Inc.
for rights to Pompase-TM- enzyme replacement therapy for Pompe disease.

    The increase in research and development expense for the six months ended
June 30, 2000 as compared to the same period last year is a result of the
following:

    - a charge of $19.5 million during the first quarter of 2000 for the initial
      amounts paid to Synpac under a license agreement granted by Synpac to
      Genzyme to develop and commercialize Pompase-TM- enzyme replacement
      therapy for Pompe disease, which is produced using a Chinese hamster ovary
      cell line, offset in part by a $10.3 million research and development
      reimbursement received from Pharming as described above;

    - increased spending on our program to develop Fabrazyme-TM- enzyme for the
      treatment of Fabry disease;

    - increased costs in connection with the operations of ATIII LLC, a joint
      venture with Genzyme Transgenics whose results we consolidate;

    - increased spending in our cell and gene therapy programs;

    - increased clinical trial costs for our melanoma and breast cancer tumor
      vaccine programs;

    - an increase in the number of research personnel and related expenses
      required to support our immunotherapy and antiangiogenesis programs; and

    - the termination of our TGF-beta and other research and development
      programs allocated to Genzyme Tissue Repair.

                                       44
<PAGE>
AMORTIZATION OF INTANGIBLES

    Our amortization of intangibles is attributable primarily to intangible
assets acquired in connection with the acquisition of PharmaGenics, Inc. in June
1997. These assets were fully amortized by the end of the second quarter of
2000.


OTHER INCOME AND EXPENSES



<TABLE>
<CAPTION>
                                      THREE MONTHS ENDED                   SIX MONTHS ENDED
                                           JUNE 30,         INCREASE/          JUNE 30,         INCREASE/
                                     --------------------   (DECREASE)   --------------------   (DECREASE)
                                       2000        1999      % CHANGE      2000        1999      % CHANGE
                                     ---------   --------   ----------   ---------   --------   ----------
                                     (REVISED)                           (REVISED)
                                           (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                  <C>         <C>        <C>          <C>         <C>        <C>
Equity in net loss of
  unconsolidated affiliates........  $(11,313)   $(8,962)        26%     $(19,446)   $(19,100)         2%
Minority interest..................     1,352        864         56%        2,208       1,730         28%
Investment income..................    10,631      9,102         17%       20,575      17,288         19%
Interest expense...................    (3,836)    (5,590)      (31)%       (7,775)    (11,088)      (30)%
Gain on affiliate sale of stock....        --         --         N/A       20,270         606      3,245%
Gain on sale of product line.......        --      7,500      (100)%           --       7,500      (100)%
Gain on sale of equity
  securities.......................    14,165         --        100%       14,165       1,963        236%
Charge for impaired investment.....        --     (5,487)     (100)%           --      (5,487)     (100)%
Other..............................     5,193         (3)        N/A        5,195          43         N/A
                                     --------    -------                 --------    --------
  Total other income (expenses)....  $ 16,192    $(2,576)       729%     $ 35,192    $ (6,545)       638%
                                     ========    =======                 ========    ========
</TABLE>


EQUITY IN NET LOSS OF UNCONSOLIDATED AFFILIATES:


    We currently own approximately 28% of the common stock of Genzyme
Transgenics. We record in net loss of unconsolidated affiliates our portion of
their results. We also record the results of the following joint ventures and
strategic alliances in net loss of unconsolidated affiliates:


<TABLE>
<CAPTION>
JOINT VENTURE/
STRATEGIC ALLIANCE            PARTNER(S)         EFFECTIVE DATE     PRODUCT/INDICATION         GENZYME DIVISION
------------------      ----------------------   --------------   -----------------------   -----------------------
<S>                     <C>                      <C>              <C>                       <C>
 RenaGel LLC            GelTex                   June 1997        Renagel-Registered Trademark- Genzyme General
                        Pharmaceuticals, Inc.                     Capsules for the
                                                                  reduction of serum
                                                                  phosphorus in patients
                                                                  with end-stage renal
                                                                  disease on hemodialysis

 BioMarin/              BioMarin                 September 1998   Alpha-L-iduronidase for   Genzyme General
 Genzyme LLC            Pharmaceutical Inc.                       the treatment of
                                                                  mucopolysaccharidosis-I

 Pharming/              Pharming Group N.V.      October 1998     Transgenically-           Genzyme General
 Genzyme LLC                                                      produced human alpha-
                                                                  glucosidase for the
                                                                  treatment of Pompe
                                                                  disease

 Genzyme/               Pharming Group N.V.      June 2000        Pompase-TM- enzyme        Genzyme General
 Pharming                                                         replacement therapy for
 Alliance LLC                                                     Pompe disease

 Diacrin/               Diacrin, Inc.            October 1996     Products using porcine    Genzyme Tissue Repair
 Genzyme LLC                                                      fetal cells for the       (until May 1999);
                                                                  treatment of              Genzyme General (after
                                                                  Parkinson's and           May 1999)
                                                                  Huntington's diseases

 StressGen/             StressGen                July 1997        Stress gene therapies     Genzyme Molecular
 Genzyme LLC            Biotechnologies Ltd.;                     for the treatment of      Oncology
                        Canadian Medical                          cancer
                        Discoveries Fund, Inc.
                        (until October 1999)
</TABLE>

                                       45
<PAGE>
    Our equity in net loss of unconsolidated affiliates increased in both
periods as a result of:

    - increased losses from RenaGel LLC;

    - increased losses from BioMarin/Genzyme LLC;

    - increased losses from Diacrin/Genzyme LLC; and

    - increased losses from Genzyme Transgenics.

    These increases were offset in part by decreased losses from
Pharming/Genzyme LLC and the absence of losses from StressGen/Genzyme LLC, which
was dissolved in the fourth quarter of 1999.

MINORITY INTEREST:

    Due to our combined direct and indirect ownership interest in ATIII LLC, we
consolidate the results of ATIII LLC and record Genzyme Transgenics' portion of
the losses of that joint venture as minority interest. Minority interest for
both periods increased due to increased losses incurred by ATIII LLC.

INVESTMENT INCOME:

    Investment income increased during both periods due to higher average cash
and investment balances.

INTEREST EXPENSE:

    Our interest expense decreased during both periods as a result of our
repayment in November 1999 of $82.0 million outstanding under our revolving
credit facility.

GAIN ON AFFILIATE SALE OF STOCK:

    In February 2000, Genzyme Transgenics, an unconsolidated affiliate,
completed an offering of 3.5 million shares of Genzyme Transgenics common stock,
resulting in net proceeds to Genzyme Transgenics of $75.2 million (after the
exercise of the underwriter's overallotment option). In accordance with our
policy pertaining to affiliate sales of stock, we recognized a gain of
$20.3 million and recorded a net deferred tax expense of $3.9 million for the
three months ended March 31, 2000. The deferred tax expense is net of a
$3.4 million credit for the elimination of a valuation allowance on deferred tax
assets. As a result of the issuance of the additional shares by Genzyme
Transgenics, our ownership interest in Genzyme Transgenics decreased from 33% to
28%.

GAIN ON SALE OF PRODUCT LINE OR BUSINESS:

    In June 1999, we recorded a gain of $7.5 million representing the payment of
a note receivable that we received as partial consideration for the sale of
Genetic Design, Inc. in 1996. We had previously fully reserved the amount of
this note because we considered the repayment of the note to be uncertain.

GAIN ON SALE OF EQUITY SECURITIES:

    In June 2000, we recorded a gain of $5.5 million upon the sale of a portion
of our investment in Genzyme Transgenics common stock. The tax effect of this
gain was fully offset by the reversal of a $1.9 million valuation allowance
related to previously recognized capital losses.


    On June 1, 2000, Celtrix Pharmaceuticals, Inc. was acquired by Insmed Inc.
upon which our shares of Celtrix common stock were exchanged on a 1-for-1 basis
for shares of Insmed common stock. On the date of the exchange, we recognized
the unrealized gain of $7.6 million, net of tax, as a credit to


                                       46
<PAGE>

stockholders' equity. We should have recognized this gain as a realized gain and
recorded such gain in income. Accordingly, we have revised our financial
statements for the three and six months ended June 30, 2000 to reclassify the
$7.6 million gain, net of tax, from an unrealized gain to a realized gain. The
impact of this revision on the three and six months ended June 30, 2000 is as
follows:



<TABLE>
<CAPTION>
                                             PREVIOUSLY REPORTED                   REVISED
                                        -----------------------------   -----------------------------
                                          3 MONTHS        6 MONTHS        3 MONTHS        6 MONTHS
                                        -------------   -------------   -------------   -------------
                                         (UNAUDITED, AMOUNTS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                     <C>             <C>             <C>             <C>
Gain on sale of equity securities.....     $  6,592        $  6,592        $ 14,165        $ 14,165
Income before income taxes............       65,233         108,905          72,806         116,478
Provision for income taxes............      (20,699)        (32,553)        (23,314)        (35,168)
Net income............................       44,534          76,352          49,492          81,310
Net income allocated to Genzyme
  General Stock.......................       66,077         117,714          71,035         122,672
Net income per share of Genzyme
  General Stock:
  Basic...............................     $   0.78        $   1.39        $   0.84        $   1.45
  Diluted.............................     $   0.72        $   1.29        $   0.77        $   1.35
</TABLE>


CHARGE FOR IMPAIRED INVESTMENT:

    In June 1999, we recorded a $5.5 million charge in connection with a
strategic investment in a collaborator's common stock because we considered the
decline in the value of that stock to be other than temporary. In connection
with this assessment, we concluded that substantial evidence existed that the
value of the investment would recover to at least its cost. This included
continued positive progress in the issuer's scientific programs, ongoing
activity in our collaborations with the issuer, and a lack of any substantial
company-specific adverse events causing the declines in value. However, given
the significance and duration of the decline as of the end of the applicable
quarter, we concluded that it was unclear over what period such price recovery
would take place and that, accordingly, the positive evidence suggesting that
the investment would recover to at least our purchase price was not sufficient
to overcome the presumption that the current market price was the best indicator
of the value of these investments.

OTHER:

    In April, 2000, we received net proceeds of approximately $5.1 million in
connection with the settlement of a lawsuit. The lawsuit, initiated in 1993,
pertained to an accidental spill of Ceredase-Registered Trademark- enzyme at a
fill facility operated by a contractor to Genzyme. We allocated the net proceeds
from the settlement of this lawsuit to Genzyme General.

TAX PROVISION


<TABLE>
<CAPTION>
                                           THREE MONTHS
                                              ENDED                          SIX MONTHS ENDED
                                             JUNE 30,         INCREASE/          JUNE 30,         INCREASE/
                                       --------------------   (DECREASE)   --------------------   (DECREASE)
                                         2000        1999      % CHANGE      2000        1999      % CHANGE
                                       ---------   --------   ----------   ---------   --------   ----------
                                       (REVISED)                           (REVISED)
                                             (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                    <C>         <C>        <C>          <C>         <C>        <C>
Provision for income taxes...........   $23,314     $7,431       214%       $35,168    $17,264       104%
Tax rate.............................       32%        54%                      30%        44%
</TABLE>


    Our tax rates for both periods vary from the U.S. statutory tax rate as a
result of our:

    - provision for state income taxes;

                                       47
<PAGE>
    - use of a foreign sales corporation;

    - nondeductible amortization of intangibles;

    - use of tax credits; and

    - share of losses of unconsolidated affiliates.

    In the three months ended June 30, 2000 we reversed a $1.9 million valuation
allowance, which reduced our tax rate for the period by 2.9%. In the six months
ended June 30, 2000, we reversed valuation allowances totaling $5.3 million,
which reduced our tax rate for the period by 4.9%.


EARNINGS ALLOCATIONS



    Genzyme allocates its earnings to each of our series of common stock based
on the earnings attributable to that series of stock. The earnings attributable
to each series of stock is defined in our charter as the net income or loss of
the corresponding division determined in accordance with generally accepted
accounting principles and as adjusted for tax benefits allocated to or from the
division in accordance with our management and accounting policies. The earnings
allocated to each series of common stock are indicated in the table below (in
thousands):



<TABLE>
<CAPTION>
                                                      THREE MONTHS ENDED      SIX MONTHS ENDED
                                                           JUNE 30,               JUNE 30,
                                                     --------------------   ---------------------
                                                       2000        1999       2000        1999
                                                     (REVISED)              (REVISED)
<S>                                                  <C>         <C>        <C>         <C>
Earnings allocated to:
  Genzyme General Stock............................  $ 71,035    $ 23,448   $ 122,672   $  55,929
  Molecular Oncology Stock.........................    (7,363)     (8,158)    (12,420)    (15,218)
  Surgical Products Stock..........................   (10,367)       (880)    (20,410)       (880)
  Tissue Repair Stock..............................    (4,031)     (8,382)     (9,002)    (17,998)
</TABLE>



    In connection with the creation of Genzyme Surgical Products as a separate
division and the distribution of Surgical Products Stock on June 28, 1999, we
modified the way that we allocate income and losses to our series of stock.



    Through June 27, 1999, the operations of Genzyme Surgical Products were
included in Genzyme General, and the losses of Genzyme Surgical Products were
allocated to Genzyme General Stock. Since June 28, 1999, the losses of Genzyme
Surgical Products were no longer included in the determination of income
allocated to Genzyme General Stock. This change in the methodology of allocating
income or losses has resulted in an increase in the income allocated to Genzyme
General Stock that is not due to operational changes or new business. Subsequent
to the creation of Genzyme Surgical Products, pursuant to the Company's
management and accounting policies, tax benefits generated by Genzyme Surgical
Products continued to be allocated to Genzyme General Stock.



    From January 1, 1999 through June 27, 1999, the net loss of Genzyme Surgical
Products of $27.5 million was allocated to Genzyme General Stock. From June 28,
1999 through June 30, 1999, the net loss of Genzyme Surgical Products of $0.9
million was allocated to Surgical Products Stock and excluded from income
allocated to Genzyme General Stock. As a result of this change in allocation
methodology, income allocated to Genzyme General Stock for the six months ended
June 30, 1999 was $0.9 million (or 1%) higher than what would have been
allocated had Genzyme Surgical Products remained a part of Genzyme General.



    If the shares of Surgical Products Stock initially issued on June 28, 1999
were assumed to be outstanding since January 1, 1999, net income allocated to
Genzyme General Stock, net loss allocated


                                       48
<PAGE>

to Surgical Products Stock and weighted average shares outstanding would have
been as follows (in thousands):



<TABLE>
<CAPTION>
                                                             THREE MONTHS ENDED   SIX MONTHS ENDED
                                                               JUNE 30, 1999       JUNE 30, 1999
                                                             ------------------   ----------------
<S>                                                          <C>                  <C>
Genzyme General:
  Net income allocated to Genzyme General Stock............       $ 40,226            $ 83,452
                                                                  ========            ========
  Weighted average shares outstanding:
    Basic..................................................         82,644              82,301
    Diluted................................................         92,683              92,629

Genzyme Surgical Products:
  Net loss allocated to Surgical Products Stock............       $(17,658)           $(28,403)
                                                                  ========            ========
  Weighted average shares outstanding-basic and diluted....         14,800              14,800
</TABLE>



    As noted above, the tax benefits associated with the losses of Genzyme
Surgical Products which amounted to $0.3 million for the period from June 28,
1999 to June 30, 1999, continued to be allocated to Genzyme General Stock. Our
management and accounting policies provide that, if as of the end of any fiscal
quarter, a division can not use any projected annual tax benefit attributable to
it to offset or reduce its current or deferred income tax expense, we may
allocate the tax benefit to other divisions in proportion to their taxable
income without any compensating payments or allocation to the division
generating the benefit. Tax benefits allocated to Genzyme General, which are
included in earnings attributable to Genzyme General Stock, are as follows (in
thousands):



<TABLE>
<CAPTION>
                                                           THREE MONTHS ENDED      SIX MONTHS ENDED
                                                                JUNE 30,               JUNE 30,
                                                          --------------------   --------------------
                                                            2000        1999       2000        1999
                                                          (REVISED)              (REVISED)
<S>                                                       <C>         <C>        <C>         <C>
Tax benefits allocated from:
  Genzyme Molecular Oncology............................   $2,441     $ 2,376     $ 3,537    $ 4,310
  Genzyme Surgical Products.............................    3,236       6,525       6,656     10,350
  Genzyme Tissue Repair.................................    1,368       3,412       3,180      7,374
                                                           ------     -------     -------    -------
    Total...............................................   $7,045     $12,313     $13,373    $22,034
                                                           ======     =======     =======    =======
Total tax benefits allocated from other Genzyme
  divisions as a % of earnings allocated to Genzyme
  General Stock.........................................      11%         44%         12%        36%
</TABLE>



    The amount of tax benefits allocated to Genzyme General fluctuate based on
the results of Genzyme Molecular Oncology, Genzyme Surgical Products and Genzyme
Tissue Repair. If the losses of those divisions decline, as they are expected
to, then the tax benefits allocated to Genzyme General will also decline.


                                       49
<PAGE>
                                GENZYME GENERAL

    The components of Genzyme General's combined statements of operations are
described in the following table:


<TABLE>
<CAPTION>
                                   THREE MONTHS ENDED                   SIX MONTHS ENDED
                                        JUNE 30,         INCREASE/          JUNE 30,         INCREASE/
                                  --------------------   (DECREASE)   --------------------   (DECREASE)
                                    2000        1999      % CHANGE      2000        1999      % CHANGE
                                  ---------   --------   ----------   ---------   --------   ----------
                                  (REVISED)                           (REVISED)
                                        (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                               <C>         <C>        <C>          <C>         <C>        <C>
Total revenues..................  $186,694    $154,205         21%    $357,320    $304,971         17%
Cost of products and services
  sold..........................    45,995      36,169         27%      87,043      72,891         19%
Selling, general and
  administrative................    42,972      42,333          2%      81,194      78,058          4%
Research and development........    15,391      24,947       (38)%      58,134      46,012         26%
Amortization of intangibles.....     2,011       2,017          0%       3,979       4,103        (3)%
                                  --------    --------                --------    --------
      Total operating costs and
        expenses................   106,369     105,466          1%     230,350     201,064         15%
                                  --------    --------                --------    --------
Operating income................    80,325      48,739         65%     126,970     103,907         22%
Other income (expense), net.....    14,576        (409)     3,664%      32,084      (1,856)     1,829%
                                  --------    --------                --------    --------
Income before income taxes......    94,901      48,330         96%     159,054     102,051         59%
Provision for income taxes......   (30,911)    (20,417)        51%     (49,755)    (40,633)        22%
                                  --------    --------                --------    --------
Division net income.............  $ 63,990    $ 27,913        129%    $109,299    $ 61,418         78%
                                  ========    ========                ========    ========
</TABLE>


REVENUES

<TABLE>
<CAPTION>
                                  THREE MONTHS ENDED                  SIX MONTHS ENDED
                                       JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                  -------------------   (DECREASE)   -------------------   (DECREASE)
                                    2000       1999      % CHANGE      2000       1999      % CHANGE
                                  --------   --------   ----------   --------   --------   ----------
                                       (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                               <C>        <C>        <C>          <C>        <C>        <C>
Product revenue.................  $171,470   $139,192       23%      $326,809   $275,541       19%
Service revenue.................    15,061     14,534        4%        30,181     28,426        6%
                                  --------   --------                --------   --------
      Total product and service
        revenue.................   186,531    153,726       21%       356,990    303,967       17%
Research and development
  revenue.......................       163        479     (66)%           330      1,004     (67)%
                                  --------   --------                --------   --------
      Total revenues............  $186,694   $154,205       21%      $357,320   $304,971       17%
                                  ========   ========                ========   ========
</TABLE>

                                       50
<PAGE>
    The following table sets forth product and service revenues on a segment
basis:


<TABLE>
<CAPTION>
                                  THREE MONTHS ENDED                  SIX MONTHS ENDED
                                       JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                  -------------------   (DECREASE)   -------------------   (DECREASE)
                                    2000       1999      % CHANGE      2000       1999      % CHANGE
                                  --------   --------   ----------   --------   --------   ----------
                                       (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                               <C>        <C>        <C>          <C>        <C>        <C>
Product revenue:
  Therapeutics:
    Cerezyme-Registered Trademark-/Ceredase-Registered Trademark-
      enzyme....................  $134,854   $116,904       15%      $263,460   $230,658        14%
   Renagel-Registered Trademark-
      Capsules..................    10,218         --      100%        10,218         --       100%
  Thyrogen-Registered Trademark-
      hormone...................     3,506      2,319       51%         6,867      3,606        90%
    Other therapeutic
      products..................        --         --        --         1,835         --       100%
                                  --------   --------                --------   --------
      Total Therapeutics........   148,578    119,223       25%       282,380    234,264        21%
    Diagnostic Products.........    15,539     14,955        4%        30,777     29,646         4%
    Other.......................     7,353      5,014       47%        13,652     11,631        17%
                                  --------   --------                --------   --------
      Total product revenue.....   171,470    139,192       23%       326,809    275,541        19%
Service revenue:
    Other.......................    15,061     14,534        4%        30,181     28,426         6%
                                  --------   --------                --------   --------
Total product and service
  revenue.......................  $186,531   $153,726       21%      $356,990   $303,967        17%
                                  ========   ========                ========   ========
</TABLE>


THERAPEUTICS:

    Genzyme General's increase in product revenue during both periods is largely
due to increased sales of Cerezyme-Registered Trademark- enzyme, which is
attributable to its identification of new Gaucher disease patients throughout
the world and strong international sales. Genzyme General also sells
Ceredase-Registered Trademark- enzyme for the treatment of Gaucher disease, but
it has successfully converted virtually all Gaucher disease patients to a
treatment regimen using Cerezyme-Registered Trademark- enzyme.

    Genzyme General's results of operations are highly dependent on sales of
Cerezyme-Registered Trademark- enzyme and a reduction in revenue from sales of
this product would adversely affect its results of operations.

    The following table provides information regarding the growth in sales of
Genzyme General's Gaucher disease therapies as a percentage of total revenue
during both periods.

<TABLE>
<CAPTION>
                                                      THREE MONTHS ENDED     SIX MONTHS ENDED
                                                           JUNE 30,              JUNE 30,
                                                      -------------------   -------------------
                                                        2000       1999       2000       1999
                                                      --------   --------   --------   --------
                                                                     (UNAUDITED)
<S>                                                   <C>        <C>        <C>        <C>
% of total product revenue..........................       79%        84%        81%        84%
</TABLE>

    Genzyme General began recording revenues from Renagel-Registered Trademark-
Capsules (sevelamer hydrochloride) during the second quarter of 2000 under an
amended distribution arrangement with its joint venture partner, GelTex
Pharmaceuticals, Inc. Revenues from Renagel-Registered Trademark- Capsules were
previously recorded by the joint venture. Renagel-Registered Trademark- Capsules
are used to reduce serum phosphorus levels in patients with end-stage renal
disease on dialysis.

    Therapeutics revenues for both periods also include sales of
Thyrogen-Registered Trademark- hormone, which is an adjunctive diagnostic tool
for well differentiated thyroid cancer. Sales of Thyrogen-Registered Trademark-
hormone increased in the three and six months ended June 30, 2000 due to
increased market penetration. We commenced commercial sales of
Thyrogen-Registered Trademark- hormone in January 1999.

                                       51
<PAGE>
DIAGNOSTIC PRODUCTS:

    Diagnostic Products' revenues increased during both periods due primarily to
increased sales of HDL and LDL cholesterol testing products, despite the sale of
our bioreagent and ELISA product lines, in July 1999. Product revenue for
Diagnostic Products includes royalties on product sales by Techne Corporation's
biotechnology group.

    Diagnostics' service revenue increased during the period as a result of
growth in sales of our DNA and cancer testing services.

OTHER:

    Other revenue for both periods includes

    - product revenue from sale of lipids and peptides for drug delivery; and

    - genetic testing service revenue.

INTERNATIONAL PRODUCT AND SERVICE SALES:

    A substantial portion of Genzyme General's revenue is generated outside of
the United States, as described in the following table. Most of these revenues
are attributable to sales of Cerezyme-Registered Trademark- enzyme.

<TABLE>
<CAPTION>
                                    THREE MONTHS ENDED                  SIX MONTHS ENDED
                                         JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                    -------------------   (DECREASE)   -------------------   (DECREASE)
                                      2000       1999      % CHANGE      2000       1999      % CHANGE
                                    --------   --------   ----------   --------   --------   ----------
                                         (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                 <C>        <C>        <C>          <C>        <C>        <C>
International product and service
  revenue.........................  $79,235    $67,592       17%       $157,007   $131,048      20%
% of total product and service
  revenue.........................      42%        44%                      44%        43%
</TABLE>

MARGINS

<TABLE>
<CAPTION>
                                  THREE MONTHS ENDED                  SIX MONTHS ENDED
                                       JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                  -------------------   (DECREASE)   -------------------   (DECREASE)
                                    2000       1999      % CHANGE      2000       1999      % CHANGE
                                  --------   --------   ----------   --------   --------   ----------
                                       (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                               <C>        <C>        <C>          <C>        <C>        <C>
Product margin..................  $134,419   $112,056      20%       $257,538   $220,438      17%
% of product revenue............       78%        81%                     79%        80%
Service margin..................     6,117      5,501      11%         12,409     10,638      17%
% of service revenue............       41%        38%                     41%        37%
Total gross margin..............  $140,536   $117,557      20%       $269,947   $231,076      17%
% of total product and service
  revenue.......................       75%        76%                     76%        76%
</TABLE>

    Genzyme General provides a broad range of healthcare products and services.
As a result, Genzyme General's gross margin varies significantly based on the
category of product or service. Sales of therapeutic products, including
Cerezyme-Registered Trademark- enzyme, result in higher margins than sales of
diagnostic products.

    Our service margin increased during both periods as a result of increases in
sales of DNA and cancer testing services.

                                       52
<PAGE>
OPERATING EXPENSE

    The increase in selling, general and administrative expenses in both periods
is related to:

    - increased staffing to support the growth in several of Genzyme General's
      product lines; and

    - increased expenditures to support the increased sales of
      Cerezyme-Registered Trademark- enzyme and Thyrogen-Registered Trademark-
      hormone.

    The decrease in research and development expense for the second quarter of
2000 as compared to the second quarter of 1999 is a result of a $10.3 million
research and development reimbursement from Pharming Group N.V. representing
Pharming's share of amounts Genzyme General previously paid to Synpac (North
Carolina), Inc. for rights to Pompase-TM- enzyme replacement therapy for Pompe
disease, which is produced using a Chinese hamster ovary cell line.

    The increase in research and development expense for the six months ended
June 30, 2000 as compared to the same period last year is a result of the
following:

    - a charge of $19.5 million during the first quarter of 2000 for the initial
      amounts payable to Synpac under a license agreement granted by Synpac to
      Genzyme to develop and commercialize Pompase-TM- enzyme replacement
      therapy for Pompe disease, offset by a $10.3 million research and
      development reimbursement from Pharming as described above;

    - increased spending on our program to develop Fabrazyme-TM- enzyme for the
      treatment of Fabry disease;

    - increased costs in connection with the operations of ATIII LLC, a joint
      venture with Genzyme Transgenics Corporation, whose results we
      consolidate; and

    - increased spending in our cell and gene therapy programs.


OTHER INCOME AND EXPENSES



<TABLE>
<CAPTION>
                                     THREE MONTHS ENDED                   SIX MONTHS ENDED
                                          JUNE 30,         INCREASE/          JUNE 30,         INCREASE/
                                    --------------------   (DECREASE)   --------------------   (DECREASE)
                                      2000        1999      % CHANGE      2000        1999      % CHANGE
                                    ---------   --------   ----------   ---------   --------   ----------
                                    (REVISED)                           (REVISED)
                                          (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                 <C>         <C>        <C>          <C>         <C>        <C>
Equity in net loss of
  unconsolidated affiliates.......
                                    $(11,313)   $(6,969)        62%     $(19,446)   $(14,725)       32%
Minority interest.................     1,352        864         56%        2,208       1,730        28%
Investment income.................     8,639      8,820         (2)%      16,726      16,743         0%
Interest expense..................    (3,441)    (5,137)       (33)%      (6,992)    (10,186)      (31)%
Gain on affiliate sale of stock...        --         --         --        20,270         606     3,245%
Gain on sale of product line......        --      7,500       (100)%          --       7,500      (100)%
Gain on sale of equity
  securities......................    14,165         --        100%       14,165       1,963       622%
Charge for impaired investment....        --     (5,487)      (100)%          --      (5,487)     (100)%
Other.............................     5,174         --        100%        5,153          --       100%
                                    --------    -------                 --------    --------
      Total other income
        (expenses)................  $ 14,576    $  (409)     3,664%     $ 32,084    $ (1,856)    1,829%
                                    ========    =======                 ========    ========
</TABLE>


EQUITY IN NET LOSS OF UNCONSOLIDATED AFFILIATES:

    Genzyme General records in equity in net loss of unconsolidated affiliates
its portion of the results of our joint ventures and strategic alliances with
GelTex, BioMarin Pharmaceutical Inc., Pharming and Diacrin, Inc. Genzyme General
also records a portion of the results of Genzyme Transgenics in equity in net
loss of unconsolidated affiliates.

                                       53
<PAGE>
    Genzyme General's equity in net loss of unconsolidated affiliates increased
in both periods as a result of:

    - increased losses from RenaGel LLC, our joint venture with GelTex;

    - increased losses from our joint venture with BioMarin to develop and
      commercialize Aldurazyme-TM- enzyme for the treatment of
      mucopolysaccharidosis-I;

    - the reallocation of our joint venture with Diacrin from Genzyme Tissue
      Repair to Genzyme General in May 1999; and

    - increased losses from Genzyme Transgenics.

    These increases were offset in part by decreased losses from
Pharming/Genzyme LLC.

MINORITY INTEREST:

    Due to our combined direct and indirect ownership interest in ATIII LLC,
Genzyme General consolidates the results of ATIII LLC and records Genzyme
Transgenics' portion of the losses of that joint venture as minority interest.
Minority interest for both periods increased due to increased losses incurred by
ATIII LLC.

GAIN ON SALE OF PRODUCT LINE OR BUSINESS:

    In June 1999, Genzyme General recorded a gain of $7.5 million representing
the payment of a note receivable that it received as partial consideration for
the sale of Genetic Design, Inc. in 1996. Genzyme General had previously fully
reserved the amount of this note because it considered the repayment of the note
to be uncertain.

GAIN ON AFFILIATE SALE OF STOCK:

    In February 2000, Genzyme Transgenics, an unconsolidated affiliate,
completed an offering of 3.5 million shares of Genzyme Transgenics common stock,
resulting in net proceeds to Genzyme Transgenics of $75.2 million (after the
exercise of the underwriter's overallotment option). In accordance with our
policy pertaining to affiliate sales of stock, we recognized a gain of
$20.3 million and recorded a net deferred tax expense of $3.9 million for the
three months ended March 31, 2000. The deferred tax expense is net of a
$3.4 million credit for the reversal of the valuation allowance on a deferred
tax asset. As a result of the issuance of the additional shares by Genzyme
Transgenics, our ownership interest in Genzyme Transgenics decreased from 33% to
28%.

INVESTMENT INCOME:

    For the three months ended June 30, 2000, investment income decreased
slightly as compared to the same period of 1999 due to slightly lower average
cash and investment balances, and the allocation of $150.0 million of cash and
investments from Genzyme General to Genzyme Surgical Products in June 1999. For
the six months ended June 30, 2000, investment income was not significantly
different from the same period of 1999.

INTEREST EXPENSE:

    Genzyme General's interest expense decreased during both periods as a result
of our repayment in November 1999 of $82.0 million outstanding under our
revolving credit facility, which had been allocated to Genzyme General.

                                       54
<PAGE>
GAIN ON SALE OF EQUITY SECURITIES:

    In June 2000, we recorded a gain of $5.5 million upon the sale of a portion
of our investment in Genzyme Transgenics common stock. The tax effect of this
gain was fully offset by the reversal of a $1.9 million valuation allowance
related to previously recognized capital losses.


    On June 1, 2000, Celtrix Pharmaceuticals, Inc. was acquired by Insmed Inc.
upon which our shares of Celtrix common stock were exchanged on a 1-for-1 basis
for shares of Insmed common stock. On the date of the exchange, we recognized
the unrealized gain of $7.6 million, net of tax, as a credit to division equity.
We should have recognized this gain as a realized gain and recorded such gain in
income. Accordingly, we have revised our financial statements for the three and
six months ended June 30, 2000 to reclassify the $7.6 million gain, net of tax,
from an unrealized gain to a realized gain. The impact of this revision on the
three and six months ended June 30, 2000 is as follows:



<TABLE>
<CAPTION>
                                             PREVIOUSLY REPORTED                   REVISED
                                        -----------------------------   -----------------------------
                                          3 MONTHS        6 MONTHS        3 MONTHS        6 MONTHS
                                        -------------   -------------   -------------   -------------
                                         (UNAUDITED, AMOUNTS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                     <C>             <C>             <C>             <C>
Gain on sale of equity securities.....     $  6,592        $  6,592        $ 14,165        $ 14,165
Income before income taxes............       87,328         151,481          94,901         159,054
Provision for income taxes............      (28,303)        (47,147)        (30,911)        (49,755)
Division net income...................       59,025         104,334          63,990         109,299
</TABLE>


CHARGE FOR IMPAIRED INVESTMENT:

    In June 1999, Genzyme General recorded a $5.5 million charge in connection
with a strategic investment in a collaborator's common stock because it
considered the decline in the value of that stock to be other than temporary. In
connection with this assessment, we concluded that substantial evidence existed
that the value of the investment would recover to at least its cost. This
included continued positive progress in the issuer's scientific programs,
ongoing activity in our collaborations with the issuer, and a lack of any
substantial company-specific adverse events causing the declines in value.
However, given the significance and duration of the decline as of the end of the
applicable quarter, we concluded that it was unclear over what period such price
recovery would take place and that, accordingly, the positive evidence
suggesting that the investment would recover to at least our purchase price was
not sufficient to overcome the presumption that the current market price was the
best indicator of the value of these investments.

OTHER:

    In April, 2000, Genzyme General received net proceeds of approximately
$5.1 million in connection with the settlement of a lawsuit. The lawsuit,
initiated in 1993, pertained to an accidental spill of
Ceredase-Registered Trademark- enzyme at a fill facility operated by a
contractor to Genzyme General.


TAX PROVISION:



<TABLE>
<CAPTION>
                                   THREE MONTHS ENDED                   SIX MONTHS ENDED
                                        JUNE 30,         INCREASE/          JUNE 30,         INCREASE/
                                  --------------------   (DECREASE)   --------------------   (DECREASE)
                                    2000        1999      % CHANGE      2000        1999      % CHANGE
                                  ---------   --------   ----------   ---------   --------   ----------
                                  (REVISED)                           (REVISED)
                                        (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                               <C>         <C>        <C>          <C>         <C>        <C>
Provision for income tax........  $ 30,911    $ 20,417         51%    $ 49,755    $ 40,633         22%
Effective tax rate..............       33%         42%                     31%         40%
</TABLE>


                                       55
<PAGE>
    Genzyme General's tax rates for both periods vary from the U.S. statutory
tax rate as a result of its:

    - provision for state income taxes;

    - use of a foreign sales corporation;

    - nondeductible amortization of intangibles;

    - use of tax credits; and

    - share of losses of unconsolidated affiliates.

    In the three months ended June 30, 2000 we reversed a $1.9 million valuation
allowance, which reduced our tax rate for the period by 2.2%. In the six months
ended June 30, 2000, we reversed valuation allowances totaling $5.3 million,
which reduced our tax rate for the period by 3.5%.

                                       56
<PAGE>
                           GENZYME MOLECULAR ONCOLOGY

    The components of Genzyme Molecular Oncology's combined statements of
operations are described in the following table:


<TABLE>
<CAPTION>
                                        THREE MONTHS
                                            ENDED                        SIX MONTHS ENDED
                                          JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                     -------------------   (DECREASE)   -------------------   (DECREASE)
                                       2000       1999      % CHANGE      2000       1999      % CHANGE
                                     --------   --------   ----------   --------   --------   ----------
                                          (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                  <C>        <C>        <C>          <C>        <C>        <C>
Total revenues.....................  $   963    $ 1,133       (15)%     $  3,518   $  2,746        28%
Cost of revenues...................      139        372       (63)%          195      1,012      (81)%
Selling, general and
  administrative...................    1,788      1,418         26%        2,978      3,037       (2)%
Research and development...........    4,594      4,728        (3)%        8,652      8,633         0%
Amortization of intangibles........    2,464      2,957       (17)%        5,420      5,913       (8)%
                                     -------    -------                 --------   --------
    Total operating costs and
      expenses.....................    8,985      9,475        (5)%       17,245     18,595       (7)%
                                     -------    -------                 --------   --------
Operating loss.....................   (8,022)    (8,342)       (4)%      (13,727)   (15,849)     (13)%
Other income (expenses), net.......      107       (478)       122%           93       (693)      113%
                                     -------    -------                 --------   --------
Loss before income taxes...........   (7,915)    (8,820)      (10)%      (13,634)   (16,542)     (18)%
Tax benefit........................      552        662       (17)%        1,214      1,324       (8)%
                                     -------    -------                 --------   --------
Division net loss..................  $(7,363)   $(8,158)      (10)%     $(12,420)  $(15,218)     (18)%
                                     =======    =======                 ========   ========
</TABLE>


REVENUES

<TABLE>
<CAPTION>
                                        THREE MONTHS
                                            ENDED                        SIX MONTHS ENDED
                                          JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                     -------------------   (DECREASE)   -------------------   (DECREASE)
                                       2000       1999      % CHANGE      2000       1999      % CHANGE
                                     --------   --------   ----------   --------   --------   ----------
                                          (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                  <C>        <C>        <C>          <C>        <C>        <C>
Royalty and licensing revenue......  $   963    $   335        187%     $  3,518   $    739       376%
Research and development revenue...       --        198      (100)%           --        496     (100)%
Service revenue....................       --        600      (100)%           --      1,511     (100)%
                                     -------    -------                 --------   --------
      Total revenues...............  $   963    $ 1,133       (15)%     $  3,518   $  2,746        28%
                                     =======    =======                 ========   ========
</TABLE>

    Royalty and licensing revenue increased during the three and six month
periods ended June 30, 2000 as a result of a license of diagnostic rights
granted to Affymetrix, Inc. combined with an increase in SAGE-TM- gene
expression technology. Additionally, for the six month period ended June 30,
2000, royalty and licensing revenue increased due to a $2.0 million development
milestone payment received in the first quarter of 2000 from Schering-Plough
Corporation.

    Our research and development revenue decreased during both periods as a
result of the dissolution of StressGen/Genzyme LLC in December 1999.

    Service revenue decreased for both periods as a result of a planned shift in
genomics business focus from providing services to providing licenses of
SAGE-TM- gene expression technology to third parties.


COST OF REVENUES


    Genzyme Molecular Oncology's cost of revenue includes:

    - services performed using the SAGE-TM- gene expression technology on behalf
      of third parties;

                                       57
<PAGE>
    - royalties paid to third parties; and

    - work performed on behalf of Stress Gen/Genzyme LLC in the three and six
      months ended June 30, 1999. There are no similar costs for work performed
      on behalf of the joint venture in the same periods of 2000 because the
      joint venture was dissolved in the fourth quarter of 1999.

    Cost of revenue decreased for both periods as a result of the dissolution of
StressGen/Genzyme LLC in December 1999 and a planned business reduction of
genomics services provided by Genzyme Molecular Oncology.

OPERATING EXPENSES

    Genzyme Molecular Oncology's selling, general and administrative expenses
increased for the three months ended June 30, 2000 as a result of an increase in
audit and legal fees related to the registration of a secondary offering which
was subsequently withdrawn. This was offset in the six month period ended
June 30, 2000 by continued expense control efforts.

    The majority of Genzyme Molecular Oncology's research and development
expenses were directed toward its immunotherapy and anti-angiogenesis programs.
Research and development expenses were relatively stable in both periods.

AMORTIZATION OF INTANGIBLES

    Genzyme Molecular Oncology's amortization of intangibles is attributable to
intangible assets acquired in connection with the acquisition of
PharmaGenics, Inc. in June 1997. These assets were fully amortized by the end of
the second quarter of 2000.


OTHER INCOME AND EXPENSES


    Genzyme Molecular Oncology's other expenses decreased as a result of the
dissolution of StressGen/Genzyme LLC in December 1999.

                           GENZYME SURGICAL PRODUCTS

    In June 1999, we established Genzyme Surgical Products as a separate
division of Genzyme. The business of Genzyme Surgical Products had previously
been accounted for as a business unit of Genzyme General. The products and
assets allocated to Genzyme Surgical Products consist primarily of:

    - the products and assets we acquired upon the purchase of Deknatel Snowden
      Pencer, Inc. in 1996;

    - the Sepra products (our line of products and product candidates designed
      to limit post-operative adhesions); and

    - our research and development programs in biomaterials and gene and cell
      therapy for cardiovascular disease.


    Genzyme General transferred $150.0 million in cash, cash equivalents,
investments and certain other assets, to Genzyme Surgical Products in connection
with the creation of Genzyme Surgical Products as a separate division of
Genzyme. The following discussion reflects the results of operations of Genzyme
Surgical Products as if it had been accounted for as a separate division of
Genzyme for all periods presented.


                                       58
<PAGE>
    The components of Genzyme Surgical Products' combined statements of
operations are described in the following table:


<TABLE>
<CAPTION>
                                   THREE MONTHS ENDED                  SIX MONTHS ENDED
                                        JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                   -------------------   (DECREASE)   -------------------   (DECREASE)
                                     2000       1999      % CHANGE      2000       1999      % CHANGE
                                   --------   --------   ----------   --------   --------   ----------
                                        (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                <C>        <C>        <C>          <C>        <C>        <C>
Total revenues...................  $ 29,969   $ 26,681         12%    $ 59,051   $ 54,034          9%
Cost of products sold............    16,592     17,439        (5)%      32,631     33,283        (2)%
Selling, general and
  administrative.................    17,042     16,492          3%      33,442     31,779          5%
Research and development.........     7,001      8,983       (22)%      13,972     14,585        (4)%
Amortization of intangibles......     1,427      1,444        (1)%       2,853      2,861          0%
                                   --------   --------                --------   --------
      Total operating costs and
        expenses.................    42,062     44,358        (5)%      82,898     82,508          0%
                                   --------   --------                --------   --------
Operating loss...................   (12,093)   (17,677)      (32)%     (23,847)   (28,474)      (16)%
Other income, net................     1,726         19      8,984%       3,437         71      4,741%
                                   --------   --------                --------   --------
Division net loss................  $(10,367)  $(17,658)      (41)%    $(20,410)  $(28,403)      (28)%
                                   ========   ========                ========   ========
</TABLE>


REVENUES

<TABLE>
<CAPTION>
                                      THREE MONTHS ENDED                  SIX MONTHS ENDED
                                           JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                      -------------------   (DECREASE)   -------------------   (DECREASE)
                                        2000       1999      % CHANGE      2000       1999      % CHANGE
                                      --------   --------   ----------   --------   --------   ----------
                                           (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                   <C>        <C>        <C>          <C>        <C>        <C>
Cardiovascular surgery products.....  $19,786    $18,047       10%       $39,436    $37,433        5%
General surgery products............    7,372      6,238       18%        14,361     12,135       18%
Other products......................    2,811      2,396       17%         5,254      4,466       18%
                                      -------    -------                 -------    -------
  Total revenues....................  $29,969    $26,681       12%       $59,051    $54,034        9%
                                      =======    =======                 =======    =======
</TABLE>


    Cardiovascular surgery products include chest drainage and fluid management
systems, surgical closures, biomaterials, and instruments for conventional and
minimally invasive cardiac surgery. The increase in cardiovascular surgery
product revenues for both periods is primarily attributable to increased sales
of instruments for minimally invasive cardiac surgery.


    The increase in general surgery products revenue for both periods is due
primarily to the increase in sales of Sepra Film-Registered Trademark-
bioresorbable membrane. Sales of Sepra products for the three months ended
June 30, 2000 were $4.3 million compared to $3.5 million in the same periods in
1999. Sales of Sepra products for the six months ended June 30, 2000 were
$8.2 million compared to $6.4 million in the same periods in 1999. An increase
in general surgery instrument sales also contributed to the overall increase in
general surgery product revenue.

    Other surgery product revenues consist of sales of Genzyme Surgical
Products' Snowden-Pencer-Registered Trademark- line of instruments for plastic
surgery and products sold to original equipment manufacturers, including
sutures. The increase in other surgery product revenues for both periods is
primarily due to an increase in products sold to original equipment
manufacturers.

    International revenue as a percentage of total sales for all periods
presented was 30%.

                                       59
<PAGE>
MARGINS

<TABLE>
<CAPTION>
                                          THREE MONTHS
                                              ENDED                        SIX MONTHS ENDED
                                            JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                       -------------------   (DECREASE)   -------------------   (DECREASE)
                                         2000       1999      % CHANGE      2000       1999      % CHANGE
                                       --------   --------   ----------   --------   --------   ----------
                                            (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                    <C>        <C>        <C>          <C>        <C>        <C>
Gross margins........................  $13,377     $9,242       45%       $26,420    $20,751       27%
% of total revenues..................      45%        35%                     45%        38%
</TABLE>

    Genzyme Surgical Products sells a broad range of products. As a result,
Genzyme Surgical Products' gross margins may vary significantly depending on the
particular market conditions of each product line.

    Gross margins increased for both periods as a result of an increase in sales
volume, cost reduction initiatives and increased sales of higher margin
products, such as devices for minimally invasive cardiac surgery.

OPERATING EXPENSES

    Genzyme Surgical Products' selling, general and administrative expenses
increased in both periods as a result of increased spending for marketing of the
cardiovascular products, particularly the minimally invasive cardiac surgery
instrument line.

    Genzyme Surgical Products' research and development expenses decreased in
both periods as a result of a $2.0 million milestone payment to a collaborator
that was recorded in the second quarter of 1999 for which there was no
corresponding amount in 2000. This was partially offset by an increase in
research and development expenses for Genzyme Surgical Products' cell and gene
therapy programs as well as an increase in research and development spending for
surgical instruments and devices during the six months ended June 30, 2000
compared to the same period in 1999.


OTHER INCOME AND EXPENSES


    The increase in other income and expenses is primarily due to an increase in
investment income. Investment income increased because Genzyme Surgical Products
had a higher average cash balance during the three and six months ended
June 30, 2000 as a result of the allocation in June 1999 of $150.0 million in
cash and investments from Genzyme General to Genzyme Surgical Products.

                                       60
<PAGE>
                             GENZYME TISSUE REPAIR

    The components of Genzyme Tissue Repair's combined statements of operations
are described in the following table:


<TABLE>
<CAPTION>
                                         THREE MONTHS
                                             ENDED                        SIX MONTHS ENDED
                                           JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                      -------------------   (DECREASE)   -------------------   (DECREASE)
                                        2000       1999      % CHANGE      2000       1999      % CHANGE
                                      --------   --------   ----------   --------   --------   ----------
                                           (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                   <C>        <C>        <C>          <C>        <C>        <C>
Total revenues......................  $ 6,287    $ 4,665          35%    $12,154    $  8,688         40%
Cost of services sold...............    3,023      3,221         (6)%      6,046       6,219        (3)%
Selling, general and
  administrative....................    5,626      6,115         (8)%     11,365      12,429        (9)%
Research and development............    1,452      2,003        (28)%      3,323       3,971       (16)%
                                      -------    -------                 -------    --------
  Total operating costs and
    expenses........................   10,101     11,339        (11)%     20,734      22,619        (8)%
Operating loss......................   (3,814)    (6,674)       (43)%     (8,580)    (13,931)      (38)%
Other expenses, net.................     (217)    (1,708)       (87)%       (422)     (4,067)      (90)%
                                      -------    -------                 -------    --------
Division net loss...................  $(4,031)   $(8,382)       (52)%    $(9,002)   $(17,998)      (50)%
                                      =======    =======                 =======    ========
</TABLE>


REVENUES

<TABLE>
<CAPTION>
                                            THREE MONTHS
                                                ENDED                        SIX MONTHS ENDED
                                              JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                         -------------------   (DECREASE)   -------------------   (DECREASE)
                                           2000       1999      % CHANGE      2000       1999      % CHANGE
                                         --------   --------   ----------   --------   --------   ----------
                                              (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                      <C>        <C>        <C>          <C>        <C>        <C>
Carticel(-Registered Trademark-)
  chondrocytes.........................   $4,577     $3,798        21%      $ 9,109     $6,740          35%
Epicel-TM- skin grafts.................    1,709        867        97%        3,023      1,863          62%
Other..................................        1         --       100%           22         85        (74)%
                                          ------     ------                 -------     ------
  Total revenues.......................   $6,287     $4,665        35%      $12,154     $8,688          40%
                                          ======     ======                 =======     ======
</TABLE>

    Genzyme Tissue Repair's service revenue increased for the three and six
months ending June 30, 2000 as compared to the same periods of 1999 as a result
of increases in sales of Carticel-Registered Trademark- chondrocytes and
Epicel-TM- skin grafts.

    The increase in sales of Carticel-Registered Trademark- chondrocytes during
both periods is a result of continued increases in the numbers of patients
treated as well as an increase in the number of insurance reimbursement
approvals. Revenue from Epicel-TM- skin grafts varies widely from quarter to
quarter depending on the number of patients requiring severe burn care.

MARGINS:

<TABLE>
<CAPTION>
                                             THREE MONTHS
                                                 ENDED                        SIX MONTHS ENDED
                                               JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                          -------------------   (DECREASE)   -------------------   (DECREASE)
                                            2000       1999      % CHANGE      2000       1999      % CHANGE
                                          --------   --------   ----------   --------   --------   ----------
                                               (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                       <C>        <C>        <C>          <C>        <C>        <C>
Total gross margin......................   $3,264     $1,444       126%       $6,108     $2,469       147%
% of total revenue......................      52%        31%                     50%        28%
</TABLE>

    Genzyme Tissue Repair's gross margins improved in both periods as a result
of:

    - increased sales of Carticel(-Registered Trademark-) chondrocytes and
      Epicel-TM- skin grafts;

                                       61
<PAGE>
    - a reduction in fixed costs, materials and production costs for
      Carticel(-Registered Trademark-) chondrocytes and Epicel-TM- skin grafts;
      and

    - continued expense control efforts.

OPERATING EXPENSES

    Genzyme Tissue Repair's selling, general and administrative expenses
decreased in both the three and six months ended June 30, 2000 as compared to
the same periods of 1999 as a result of its efforts to streamline its
operations. Genzyme Tissue Repair's research and development expenses decreased
in both periods due to the termination of its TGF-beta and other research and
development programs.


OTHER INCOME AND EXPENSES



<TABLE>
<CAPTION>
                                             THREE MONTHS
                                                 ENDED                        SIX MONTHS ENDED
                                               JUNE 30,         INCREASE/         JUNE 30,         INCREASE/
                                          -------------------   (DECREASE)   -------------------   (DECREASE)
                                            2000       1999      % CHANGE      2000       1999      % CHANGE
                                          --------   --------   ----------   --------   --------   ----------
                                               (UNAUDITED, AMOUNTS IN THOUSANDS EXCEPT PERCENTAGE DATA)
<S>                                       <C>        <C>        <C>          <C>        <C>        <C>
Equity in net loss of joint venture.....   $  --     $(1,361)      (100)%     $  --     $(3,368)      (100)%
Investment income.......................     106          72          47%       208         165          26%
Interest expense........................    (323)       (419)       (23)%      (625)       (864)       (28)%
Other...................................      --          --          N/A        (5)         --        100 %
                                           -----     -------                  -----     -------
  Total other income (expenses).........   $(217)    $(1,708)       (87)%     $(422)    $(4,067)       (90)%
                                           =====     =======                  =====     =======
</TABLE>


    Equity in net loss of joint venture decreased during both periods as a
result of the reallocation of Genzyme's ownership interest in Diacrin/Genzyme
LLC from Genzyme Tissue Repair to Genzyme General in May 1999.

    Investment income increased in both periods as a result of higher average
cash balances.

    Interest expense decreased in the three and six months ended June 30, 2000
as compared to the same periods of 1999 as a result of the completion of the
conversion of Genzyme Tissue Repair's 5% convertible subordinated note in the
fourth quarter of 1999.

                                       62
<PAGE>
B.  LIQUIDITY AND CAPITAL RESOURCES

                              GENZYME CORPORATION

    At June 30, 2000, we had cash, cash-equivalents, and short- and long-term
investments of $694.2 million, an increase of $41.2 million from December 31,
1999.

    We generated $70.0 million in cash from operations for the six months ended
June 30, 2000.

    Our investing activities utilized net cash of $46.4 million in the first six
months of 2000 due to the following:

    - net sales and maturities of investments provided $8.1 million of cash;

    - $35.9 million was used to fund capital expenditures;

    - $12.9 million was used to fund our investments in unconsolidated
      affiliates; and

    - $5.0 million was used for the purchase of Focal, Inc. common stock as
      required upon the exercise by Focal of its first option under the stock
      purchase agreement between Genzyme and Focal. We are required, at Focal's
      option, to make future additional equity investments of up to
      $10.0 million subject to certain conditions.

    During the six months ended June 30, 2000, we received $31.0 million in cash
from exercises of stock options and the issuance of stock under our employee
stock purchase plan and made long-term debt repayments of $5.0 million.


    In June 2000, Genzyme and Pharming Group N.V. entered into a strategic
alliance agreement to share in the development and funding for the
commercialization of Pompase(TM) enzyme replacement therapy. Upon execution of
the definitive agreement, Pharming paid Genzyme cash of $250,000 and issued to
Genzyme a $10.0 million 7% Convertible Senior Note due June 1, 2004 (the
"Pharming Note"). This consideration was a reimbursement for 50% of the amounts
Genzyme previously paid to Synpac for product development and technology fees
and expenses. Accordingly, Genzyme recorded the $10.3 million as a reduction to
research and development expense during the three months ended June 30, 2000.



    The Pharming Note is convertible at any time at Genzyme's option into fully
paid and nonassessable Ordinary Shares of Pharming. We have allocated our
interest in the Pharming Note to Genzyme General and have classified the
Pharming Note as a long-term, related party note receivable as of June 30, 2000.



    In November 1999, we refinanced our $225.0 million revolving credit facility
with a $50.0 million revolving credit facility that matures in November 2000 and
a $100.0 million revolving credit facility that matures in November 2002. At
June 30, 2000, $18.0 million was outstanding under the credit facility that
matures in November 2000. We have allocated the $18.0 million of borrowings to
Genzyme Tissue Repair. We expect to expand our existing credit facilities and
borrow approximately $200 million of cash to finance the cash portion of the
Biomatrix merger consideration. We will allocate the $200 million of borrowings
to Genzyme Biosurgery in connection with its formation as a separate division of
Genzyme as discussed below.



    In April 2000, Genzyme Molecular Oncology drew $15.0 million of cash under
its interdivisional financing arrangement with Genzyme General in exchange for
676,254 Genzyme Molecular Oncology designated shares. As required by our
charter, the number of Genzyme Molecular Oncology designated shares was
determined using the average closing price of Molecular Oncology Stock for the
20 trading days beginning on the 30th trading day before the draw. As of
June 30, 2000 $15 million remained available to Genzyme Molecular Oncology under
this arrangement.


                                       63
<PAGE>

    In March 2000, Genzyme Tissue Repair made a $5.0 million draw under its
interdivisional financing arrangement with Genzyme General in exchange for
765,169 Genzyme Tissue Repair designated shares. As required by our charter, the
number of Genzyme Tissue Repair designated shares was determined using the
average closing price of Tissue Repair Stock for the 20 trading days beginning
on the 30th trading day before the draw. As of June 30, 2000 $15 million
remained available to Genzyme Tissue Repair under this arrangement.



    In March 2000, we filed with the SEC a prospectus pursuant to Rule 424 of
the Securities Act of 1933, as amended, covering the offering of 3,000,000
shares of Molecular Oncology Stock (plus 450,000 shares issuable upon exercise
of the underwriters over-allotment option). In April 2000, in light of market
volatility and current market conditions at the time, we terminated the offering
of shares of Molecular Oncology Stock contemplated by the prospectus. Pursuant
to a prospectus filed under Rule 424 of the Securities Act of 1933, in
July 2000, we sold 1,607,400 shares of Molecular Oncology Stock to a limited
number of purchasers at a price of $12.91 per share. We received approximately
$20.7 million of net proceeds from the offering which we allocated to Genzyme
Molecular Oncology. The proceeds of this offering will be used primarily to fund
Genzyme Molecular Oncology's research, preclinical and clinical development
programs, and for its working capital and general corporate purposes.


    We believe that our available cash, investments and cash flow from
operations will be sufficient to fund our planned operations and capital
requirements for the foreseeable future. Although we currently have substantial
cash resources and positive cash flow, we intend to use substantial portions of
our available cash for:

    - product development and marketing;

    - expanding facilities;

    - working capital; and

    - strategic business initiatives.

    Our cash reserves will be further reduced to pay principal and interest on
the following debt:


    - $21.2 million in principal under the 5% convertible subordinated
      debentures, which are convertible into Genzyme General Stock; and



    - $250.0 million in principal under the 5 1/4% convertible subordinated
      notes, which are convertible into shares of Genzyme General Stock,
      Molecular Oncology Stock and Surgical Products Stock.


If we use cash to pay or redeem this debt, including the interest due on it, our
cash reserves will be diminished.


    In March 2000, we entered into an agreement to acquire Biomatrix, Inc. Upon
the effectiveness of our Registration Statement on Form S-4 and completion of
the merger, we will form a new operating division called Genzyme Biosurgery and
create a new series of common stock that is intended to reflect its value and
track its performance. We refer to this stock as "Biosurgery Stock." In
connection with the merger, and upon Genzyme shareholder approval, the assets
and liabilities allocated to Genzyme Surgical Products and Genzyme Tissue Repair
will be re-allocated to Genzyme Biosurgery and shares of Surgical Products Stock
and Tissue Repair Stock will be exchanged for Biosurgery Stock. We will account
for the acquisition of Biomatrix as a purchase.



    Biomatrix stockholders will receive $37.00 in cash, one share of Biosurgery
Stock or a combination of cash and stock for each share of Biomatrix common
stock they hold. The merger agreement provides that we will pay cash for up to
28.38% of the outstanding shares of Biomatrix common stock that receive merger
consideration, or up to approximately $245.0 million.


                                       64
<PAGE>
    Holders of Surgical Products Stock will receive 0.6060 share of Biosurgery
Stock in exchange for each share of Surgical Products Stock they hold and
holders of Tissue Repair Stock will receive 0.3352 share of Biosurgery Stock in
exchange for each share of Tissue Repair Stock they hold.

    For more information about the merger and the merger consideration, we
encourage you to carefully read the Pre-Effective Amendment No. 1 to our
Registration Statement on Form S-4 filed with the SEC on July 3, 2000.

    The acquisition is subject to:

    - approval by Biomatrix's shareholders;

    - approval by our shareholders, including separate approval by the holders
      of shares of Surgical Products Stock and Tissue Repair Stock; and


    - clearance under federal anti-trust laws; and


    - other customary closing conditions.

    To satisfy these and other commitments, we may have to obtain additional
financing. We cannot guarantee that we will be able to obtain any additional
financing, extend any existing financing arrangement, or obtain either on
favorable terms.

                         EURO-THE NEW EUROPEAN CURRENCY


    Since December 31, 1999, there have been no material changes related to our
outstanding derivatives and forward contracts, or any other material contracts
as a result of the euro conversion, nor have there been any material changes in
our competitive position as a result of the conversion. We incorporate our
disclosure related to the euro conversion set forth under the heading
"Management's Discussion and Analysis of Genzyme Corporation and Subsidiaries'
Financial Condition and Results of Operations--Euro--the New European Currency"
in Exhibit 13.1 to our 1999 Form 10-K by reference into this discussion.


                                   YEAR 2000


    There have been no material changes in our Year 2000 compliance program or
our potential Year 2000 exposures since December 31, 1999. We incorporate our
disclosure related to our Year 2000 compliance program and potential Year 2000
exposure set forth under the heading "Management's Discussion and Analysis of
Genzyme Corporation and Subsidiaries' Financial Condition and Results of
Operations--Year 2000" in Exhibit 13.1 to our 1999 Form 10-K by reference into
this discussion.


                                  MARKET RISK


    There have been no material changes in our market risk since December 31,
1999. We incorporate our disclosure related to our market risk set forth under
the heading "Management's Discussion and Analysis of Genzyme Corporation and
Subsidiaries' Financial Condition and Results of Operations--Market Risk" in
Exhibit 13.1 to our 1999 Form 10-K by reference into this discussion.


                         NEW ACCOUNTING PRONOUNCEMENTS

    In March 2000, the Financial Accounting Standards Board ("FASB") issued FASB
Interpretation No. 44, "Accounting for Certain Transactions Involving Stock
Compensation--an interpretation of Accounting Principles Board Opinion No. 25"
("FIN-44"). FIN-44 will be effective on July 1, 2000, but certain conclusions in
FIN-44 cover specific events that occurred after either December 15, 1998 or
January 12, 2000.

                                       65
<PAGE>
    In December 1999, the SEC issued Staff Accounting Bulletin No. 101. "Revenue
Recognition in Financial Statements" ("SAB 101") which summarizes the staff's
view in applying generally accepted accounting principles to selected revenue
recognition issues. SAB 101 will be effective in the fourth quarter of 2000.

    We are currently evaluating the guidance provided in FIN-44 and SAB 101 and
do not expect their application to have a material effect on our financial
statements.

                                SUBSEQUENT EVENT

    On July 25, 2000, Genzyme filed a lawsuit against Transkaryotic Therapies
Inc. in the United States District court in Wilmington, Delaware for patent
infringement by the manufacture and use of Replagal-TM-, Transkaryotic
Therapies' replacement therapy for Fabry disease. The suit alleges infringement
of U.S. patent No. 5,356,804, which is exclusively licensed to Genzyme by Mount
Sinai School of Medicine. The patent is directed to methods of making
alpha-galactosidase in mammalian cells, as well as the genetically-engineered
cells themselves.

                                GENZYME GENERAL

    At June 30, 2000, Genzyme General had cash, cash-equivalents, and short- and
long-term investments of $586.0 million, an increase of $72.1 million from
December 31, 1999.

    Genzyme General generated $107.3 million in cash from operations for the six
months ended June 30, 2000.

    Genzyme General's investing activities utilized $54.8 million for the six
months ended June 30, 2000 due to the following:

    - net sales and maturities of investments used $10.8 million of cash;

    - $34.2 million of cash was used to fund capital expenditures; and

    - $12.9 million of cash was used to fund Genzyme General's investments in
      joint ventures.

    During the six months ended June 30, 2000, Genzyme General was allocated
$28.3 million in cash from exercises of options to purchase shares of Genzyme
General Stock and the issuance of Genzyme General Stock under our employee stock
purchase plan.


    In June 2000, Genzyme and Pharming Group N.V. entered into a strategic
alliance agreement to share in the development and funding for the
commercialization of Pompase(TM) enzyme replacement therapy. Upon execution of
the definitive agreement, Pharming paid Genzyme cash of $250,000 and issued to
Genzyme a $10.0 million 7% Convertible Senior Note due June 1, 2004 (the
"Pharming Note"). This consideration was a reimbursement for 50% of the amounts
Genzyme previously paid to Synpac for product development and technology fees
and expenses. Accordingly, Genzyme recorded the $10.3 million as a reduction to
research and development expense during the three months ended June 30, 2000.



    The Pharming Note is convertible at any time at Genzyme's option into fully
paid and nonassessable Ordinary Shares of Pharming. We have allocated our
interest in the Pharming Note to Genzyme General and have classified the
Pharming Note as a long-term, related party note receivable as of June 30, 2000.



    Genzyme General, together with our other operating divisions, has access to
Genzyme's revolving credit facilities. At June 30, 2000, $50.0 million was
available under a facility that matures in November 2000 and $77.0 million was
available under a facility that matures in November 2002. We expect to expand
our existing credit facilities and borrow approximately $200 million of cash to
finance the cash portion of the Biomatrix merger consideration. We will allocate
the $200 million of borrowings


                                       66
<PAGE>

to Genzyme Biosurgery in connection with its formation as a separate division of
Genzyme. We have included information about the proposed acquisition of
Biomatrix, Inc. and proposed formation of Genzyme Biosurgery as a new division
of Genzyme under the heading "Liquidity and Capital Resources--Genzyme
Corporation," which we incorporate into this discussion by reference.



    At December 31, 1999, $30.0 million of Genzyme General's cash was available
to Genzyme Molecular Oncology under its interdivisional financing arrangement
with Genzyme General. In April 2000, Genzyme Molecular Oncology drew
$15.0 million of cash under this arrangement in exchange for 676,254 Genzyme
Molecular Oncology designated shares. As of June 30, 2000, $15 million was
available to Genzyme Molecular Oncology under this arrangement. For information
regarding the determination of the amount of Genzyme Molecular Oncology
designated shares authorized in connection with each draw under this arrangement
you should read the section entitled "Liquidity and Capital Resources--Genzyme
Corporation" above.



    At December 31, 1999, $20.0 million of Genzyme General's cash was available
to Genzyme Tissue Repair under its interdivisional financing arrangement with
Genzyme General. In March 2000, Genzyme Tissue Repair made a $5.0 million draw
under this arrangement in exchange for 765,169 Genzyme Tissue Repair designated
shares. As of June 30, 2000, $15 million was available to Genzyme Tissue Repair
under this arrangement. For information regarding the determination of the
amount of Genzyme Tissue Repair designated shares authorized in connection with
each draw under this arrangement you should read the section entitled "Liquidity
and Capital Resources--Genzyme Corporation" above.


    We believe that Genzyme General's available cash, investments and cash flow
from operations will be sufficient to fund its planned operations and capital
requirements for the foreseeable future. Although Genzyme General currently has
substantial cash resources and positive cash flow, it intends to use substantial
portions of its available cash for:

    - product development and marketing;

    - expanding facilities;

    - working capital; and

    - strategic business initiatives.

    Genzyme General's cash reserves will be further reduced to pay principal and
interest on the following debt that has been allocated to Genzyme General:


    - $21.2 million in principal under the 5% convertible subordinated
      debentures, which are convertible into shares of Genzyme General Stock;
      and



    - $250.0 in principal under the 5 1/4% convertible subordinated notes, which
      are convertible into shares of Genzyme General Stock.


If Genzyme General uses cash to pay or redeem this debt, including the interest
due on it, its cash reserves will be diminished. In addition, Genzyme General's
cash resources will be reduced to the extent that the liabilities of Genzyme
Molecular Oncology, Genzyme Surgical Products or Genzyme Tissue Repair affect
our consolidated results of operations.


    To satisfy these and other commitments, we may have to obtain additional
financing for Genzyme General. We cannot guarantee that we will be able to
obtain any additional financing, extend any existing financing arrangement, or
obtain either on favorable terms.


                                       67
<PAGE>
                           GENZYME MOLECULAR ONCOLOGY

    At June 30, 2000, Genzyme Molecular Oncology had cash, cash equivalents and
short-term investments of $8.0 million, an increase of $4.4 million from
December 31, 1999.

    During 2000, Genzyme Molecular Oncology used $7.1 million in cash for
operations. This is primarily due to Genzyme Molecular Oncology's net loss for
the six months ended June 30, 2000.

    Genzyme Molecular Oncology's investing activities in the first half of 2000
used $6.8 million in cash to purchase investments.

    Financing activities provided cash of $11.4 million. This is primarily from
the $15.0 million draw in April 2000 from funds available to Genzyme Molecular
Oncology from Genzyme General discussed below and the allocation of cash
proceeds of $1.4 million from exercises of options to purchase shares of
Molecular Oncology Stock and the issuance of Molecular Oncology Stock under our
employee stock purchase plan. Offsetting these two items was a payment of
$5.0 million to repay funds borrowed in 1999 under the revolving credit
facility.


    Genzyme Molecular Oncology, together with our other operating divisions, has
access to Genzyme's revolving credit facilities. At June 30, 2000,
$50.0 million was available under a facility that matures in November 2000 and
$77.0 million was available under a facility that matures in November 2002. We
expect to expand our existing credit facilities and borrow approximately
$200 million of cash to finance the cash portion of the Biomatrix merger
consideration. We will allocate the $200 million of borrowings to Genzyme
Biosurgery in connection with its formation as a separate division of Genzyme.
We have included information about the proposed acquisition of Biomatrix, Inc.
and proposed formation of Genzyme Biosurgery as a new division of Genzyme under
the heading "Liquidity and Capital Resources--Genzyme Corporation," which we
incorporate into this discussion by reference.



    At December 31, 1999, $30.0 million of Genzyme General's cash was available
to Genzyme Molecular Oncology under its interdivisional financing arrangement
with Genzyme General. In April 2000, Genzyme Molecular Oncology drew
$15.0 million of cash under this arrangement in exchange for 676,254 Genzyme
Molecular Oncology designated shares. As of June 30, 2000 $15 million was
available to Genzyme Molecular Oncology under this arrangement. These funds will
be used primarily to fund research, preclinical and clinical development
programs, and for working capital and general corporate purposes. For
information regarding the determination of the amount of Genzyme Molecular
Oncology designated shares authorized in connection with each draw under this
arrangement you should read the section entitled "Liquidity and Capital
Resources--Genzyme Corporation" above.



    In March 2000, we filed with the SEC a prospectus pursuant to Rule 424 of
the Securities Act of 1933, as amended, covering the offering of 3,000,000
shares of Molecular Oncology Stock (plus 450,000 shares issuable upon exercise
of the underwriter's over-allotment option). In April 2000, in light of market
volatility and current market conditions at the time, we terminated the offering
of shares of Molecular Oncology Stock contemplated by the prospectus. Pursuant
to a prospectus filed under Rule 424 of the Securities Act of 1933, as amended,
in July 2000, we sold 1,607,400 shares of Molecular Oncology Stock to a limited
number of purchasers at a price of $12.91 per share. We received approximately
$20.7 million of net proceeds from the offering which we allocated to Genzyme
Molecular Oncology. The proceeds of this offering will be used primarily to fund
Genzyme Molecular Oncology's research, preclinical and clinical development
programs, and for its working capital and general corporate purposes.


    We anticipate that Genzyme Molecular Oncology's current cash resources,
together with amounts available from the following sources, will be sufficient
to fund its operations through 2000:

    - $20.8 million of gross proceeds from the July 2000 private offering of
      Molecular Oncology Stock;

                                       68
<PAGE>
    - the $15.0 million remaining under the interdivisional financing
      arrangement with Genzyme General;

    - our revolving credit facilities;

    - revenues generated from the SAGE-TM- gene expression technology; and

    - revenues from license agreements.

    We expect Genzyme Molecular Oncology to have significant operating losses
for the next several years. Genzyme Molecular Oncology plans to spend
substantial amounts of funds on, among other things:

    - research and development;

    - pre-clinical and clinical testing; and

    - pursuing regulatory approvals.

    Genzyme Molecular Oncology's cash needs may differ from those planned as a
result of many factors, including the:

    - ability to become profitable;

    - results of research and development and clinical testing;

    - achievement of milestones under existing licensing arrangements;

    - ability to establish and maintain additional strategic alliances and
      licensing arrangements;

    - enforcement of patent and other intellectual property rights;

    - market acceptance of novel approaches and therapies;

    - development of competitive products and services; and

    - ability to satisfy regulatory requirements of the FDA and other government
      authorities.


    Genzyme Molecular Oncology may require significant additional financing to
continue operations. We cannot guarantee that we will be able to obtain any
additional financing for Genzyme Molecular Oncology or find it on favorable
terms. If Genzyme Molecular Oncology has insufficient funds or is unable to
raise additional funds, it may delay, reduce or eliminate certain of its
programs. Genzyme Molecular Oncology may also have to give rights to third
parties to attempt to commercialize technologies or products that it would
otherwise commercialize itself.


                           GENZYME SURGICAL PRODUCTS

    At June 30, 2000, Genzyme Surgical Products had cash, cash equivalents, and
short- and long-term investments of $95.9 million, a decrease of $30.2 million
from December 31, 1999.

    Genzyme Surgical Products used $19.8 million in cash for operations in the
first six months of 2000. This is primarily due to Genzyme Surgical Products'
net loss of $20.4 million for the six months ended June 30, 2000.

    In June 1999, we allocated $150.0 million in cash, cash equivalents,
investments and certain other assets from Genzyme General to Genzyme Surgical
Products in connection with the creation of Genzyme Surgical Products as a
separate division of Genzyme.

    Genzyme Surgical Products' investing activities provided $15.2 million of
cash due to the following:

    - net sales and maturities of investments provided $25.7 million of cash;

                                       69
<PAGE>
    - $5.0 million of cash was used to purchase Focal, Inc. common stock as
      described below; and

    - $1.6 million of cash was used to fund capital expenditures.

    In April 2000, Focal, Inc. exercised its first option under the stock
purchase agreement between Genzyme and Focal. As required by the terms of this
agreement, Genzyme purchased $5.0 million of Focal common stock, at a price of
$8.14 per share. We have allocated these shares to Genzyme Surgical Products. We
are committed, at Focal's option, to make additional future equity investments
of up to $10.0 million subject to certain conditions.

    Genzyme Surgical Products, together with our other operating divisions, has
access to our revolving credit facilities. At June 30, 2000, $50.0 million was
available under a facility that matures in November 2000 and $77.0 million was
available under a facility that matures in November 2002. We expect to expand
our existing credit facilities and borrow approximately $200 million of cash to
finance the cash portion of the Biomatrix merger consideration. We will allocate
the $200 million of borrowings to Genzyme Biosurgery in connection with its
formation as a separate division of Genzyme as discussed below.


    In March 2000, we entered into an agreement to acquire Biomatrix, Inc. Upon
the effectiveness of our Registration Statement on Form S-4 and completion of
the merger, we will form a new operating division called Genzyme Biosurgery and
create a new series of common stock that is intended to reflect its value and
track its performance. We refer to this stock as "Biosurgery Stock." In
connection with the merger, and upon Genzyme shareholder approval, the assets
and liabilities allocated to Genzyme Surgical Products and Genzyme Tissue Repair
will be re-allocated to Genzyme Biosurgery and shares of Surgical Products Stock
and Tissue Repair Stock will be exchanged for Biosurgery Stock. We will account
for the acquisition of Biomatrix as a purchase.



    Biomatrix stockholders will receive $37.00 in cash, one share of Biosurgery
Stock or a combination of cash and stock for each share of Biomatrix common
stock they hold. The merger agreement provides that we will pay cash for up to
28.38% of the outstanding shares of Biomatrix common stock that receive merger
consideration, or up to approximately $245.0 million.


    Holders of Surgical Products Stock will receive 0.6060 share of Biosurgery
Stock in exchange for each share of Surgical Products Stock they hold and
holders of Tissue Repair Stock will receive 0.3352 share of Biosurgery Stock in
exchange for each share of Tissue Repair Stock they hold. To the extent that
Genzyme Surgical Products uses cash to complete the acquisition, its cash
reserves will be diminished.

    For more information about the merger and the merger consideration, we
encourage you to carefully read the Pre-Effective Amendment No. 1 to our
Registration Statement on Form S-4 filed with the SEC on July 3, 2000.

    We anticipate that Genzyme Surgical Products' current cash resources,
together with revenues generated from its products and distribution agreements,
will be sufficient to fund its operations through 2001. However, its cash needs
may differ from those planned because of many factors, including:

    - the ability to become profitable;

    - results of research and development efforts;

    - the ability to establish and maintain strategic collaborations and
      licensing arrangements for research and development programs;

    - the achievement of milestones under strategic collaborations;

    - the ability to establish and maintain additional distribution
      arrangements;

                                       70
<PAGE>
    - the enforcement of patent and other intellectual property rights;

    - market acceptance of novel approaches and therapies;

    - the development of competitive products; and

    - the ability to satisfy regulatory requirements of the FDA and other
      governmental authorities.

    In addition, if we exercise our option to purchase the limited partnership
interests in Genzyme Development Partners, L.P. and use cash to pay all or a
portion of the approximately $26.0 million advance payment to the limited
partners, our cash resources will be diminished. The option will be exercisable
during the 90-day period beginning on August 31, 2000. Genzyme Development
Partners is a Delaware limited partnership that was formed in 1989 to develop,
produce and derive income from the sale of Sepra products. Its general partner
is a wholly-owned subsidiary of Genzyme.

                             GENZYME TISSUE REPAIR

    At June 30, 2000, Genzyme Tissue Repair had cash and cash equivalents of
$4.4 million, a decrease of $5.0 million from December 31, 1999.

    During the first six months of 2000, Genzyme Tissue Repair used
$10.5 million of cash for operations. This is primarily due to Genzyme Tissue
Repair's net loss of $9.0 million during the period.

    Financing activities provided Genzyme Tissue Repair with $5.6 million of
cash. This includes $5.0 million drawn by Genzyme Tissue Repair from funds
available from Genzyme General under an interdivisional financing arrangement
discussed below and the allocation of $0.6 million of cash from the exercise of
options to purchase shares of Tissue Repair Stock and the issuance of Tissue
Repair Stock under an employee stock plan.

    Genzyme Tissue Repair, together with our other operating divisions, has
access to our revolving credit facilities. At June 30, 2000, $50.0 million was
available under a facility that matures in November 2000 and $77.0 million was
available under a facility that matures in November 2002. At June 30, 2000,
$18.0 million of funds outstanding under our revolving credit facility, that
matures in November 2000, were allocated to Genzyme Tissue Repair. We expect to
expand our existing credit facilities and borrow approximately $200 million of
cash to finance the cash portion of the Biomatrix merger consideration. We will
allocate the $200 million of borrowings to Genzyme Biosurgery in connection with
its formation as a separate division of Genzyme as discussed below.


    At December 31, 1999, $20.0 million of Genzyme General's cash was available
to Genzyme Tissue Repair under its interdivisional financing arrangement with
Genzyme General. In March 2000, Genzyme Tissue Repair made a $5.0 million draw
under this arrangement in exchange for 765,169 Genzyme Tissue Repair designated
shares. As of June 30, 2000, $15 million was available to Genzyme Tissue Repair
under this arrangement. For information regarding the determination of the
amount of Genzyme Tissue Repair designated shares authorized in connection with
each draw under this arrangement you should read the section entitled "Liquidity
and Capital Resources--Genzyme Corporation" above.



    In March 2000, we entered into an agreement to acquire Biomatrix, Inc. Upon
the effectiveness of our Registration Statement on Form S-4 and completion of
the merger, we will form a new operating division called Genzyme Biosurgery and
create a new series of common stock that is intended to reflect its value and
track its performance. We refer to this stock as "Biosurgery Stock." In
connection with the merger and upon Genzyme Shareholder approval, the assets and
liabilities allocated to Genzyme Surgical Products and Genzyme Tissue Repair
will be re-allocated to Genzyme Biosurgery and shares of Surgical Products Stock
and Tissue Repair Stock will be exchanged for Biosurgery Stock. We will account
for the acquisition of Biomatrix as a purchase.


                                       71
<PAGE>

    Biomatrix stockholders will receive $37.00 in cash, one share of Biosurgery
Stock or a combination of cash and stock for each share of Biomatrix common
stock they hold. The merger agreement provides that we will pay cash for up to
28.38% of the outstanding shares of Biomatrix common stock that receive merger
consideration, or up to approximately $245.0 million.



    Holders of Surgical Products Stock will receive 0.6060 share of Biosurgery
Stock in exchange for each share of Surgical Products Stock they hold and
holders of Tissue Repair Stock will receive 0.3352 share of Biosurgery Stock in
exchange for each share of Tissue Repair Stock they hold.


    We anticipate that Genzyme Tissue Repair's current cash resources, together
with the $15.0 million that remains available under the interdivisional
financing arrangement from Genzyme General, will be sufficient to fund its
operations through the end of 2000.

    Genzyme Tissue Repair's cash needs may differ from those planned as a result
of various factors, including the:

    - ability to become profitable;

    - ability to satisfy regulatory requirements of the FDA and other government
      agencies;

    - results of research and development and clinical testing;

    - enforcement of patent and other intellectual property rights; and

    - development of competitive products and services.


    In addition, in 1999, Genzyme Tissue Repair received $25.0 million in cash
from Genzyme General in connection with the re-allocation of our interest in our
joint venture with Diacrin, Inc. from Genzyme Tissue Repair to Genzyme General.
In connection with the re-allocation, it was agreed that Genzyme Tissue Repair
would be required to pay to Genzyme General $20.0 million plus accrued interest
at an annual interest rate of 13.5%. In June 2000, our board of directors
extended the milestone timeline to initiate a Phase 3 clinical trial of
NeuroCell-TM--PD from June 30, 2000 to December 31, 2000. The milestone date and
the related financial obligation were extended to allow additional time to
review data from the current blinded phase 2 clinical trial. If a phase 3
clinical trial is initiated by December 31, 2000 but NeuroCell-TM--PD does not
receive marketing approval by June 30, 2004, Genzyme Tissue Repair will be
required to pay Genzyme General $15.0 million plus accrued interest at an annual
rate of 13.5%. Genzyme Tissue Repair may repay these amounts in cash, Genzyme
Tissue Repair designated shares, or a combination of both, at its option. If
these milestones are not achieved, and Genzyme Tissue Repair elects to pay
Genzyme General in Genzyme Tissue Repair designated shares, this would
substantially dilute the rights of the holders of Tissue Repair Stock and could
significantly affect the market price of Tissue Repair Stock.



    Genzyme Tissue Repair will require substantial additional funds in order to
continue operations at current levels beyond 2000. We cannot guarantee that we
will be able to obtain any additional financing for Genzyme Tissue Repair or
find it on favorable terms. If Genzyme Tissue Repair has insufficient funds or
is unable to raise additional funds, it may be required to delay, reduce or
eliminate certain of its programs. Genzyme Tissue Repair may also have to give
rights to third parties to commercialize technologies or products that it would
otherwise commercialize itself.


ITEM 3.  QUANTITATIVE AND QUALITATIVE ANALYSIS OF MARKET RISK.

    We are exposed to potential loss from financial market risks that may occur
as a result of changes in interest rates, equity prices and foreign exchange
rates. Our exposure to these risks has not materially changed since December 31,
1999.


    We incorporate our disclosure related to market risk which is set forth
under the heading "Management's Discussion and Analysis of Genzyme Corporation
and Subsidiaries' Financial Condition and Results of Operations--Market Risk" in
Exhibit 13.1 to our 1999 Form 10-K by reference into this discussion.


                                       72
<PAGE>
                      GENZYME CORPORATION AND SUBSIDIARIES
                            FORM 10-Q, JUNE 30, 2000

PART II.  OTHER INFORMATION

ITEM 1.  LEGAL PROCEEDINGS.

    In April 2000, Genzyme General received net proceeds of approximately $5.1
million in connection with a settlement of a lawsuit. The lawsuit, initiated in
1993 in the U.S. District Court for the District of Boston, Massachusetts,
pertained to an accidental spill of Ceredese-Registered Trademark- enzyme at a
fill facility operated by a contractor to Genzyme General.

    On July 25, 2000, Genzyme filed a lawsuit for the purpose of seeking
injunctive relief and damages against Transkaryotic Therapies Inc. in the U.S.
District Court in Wilmington, Delaware for patent infringement by the
manufacture and use of Replagal-TM-, Transkaryotic Therapies' replacement
therapy for Fabry disease. The suit alleges infringement of U.S. patent
No. 5,356,804, which is exclusively licensed to Genzyme by Mount Sinai School of
Medicine. The patent is directed to methods of making alpha-galactosidase in
mammalian cells, as well as the genetically-engineered cells themselves.

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

    I. We held an annual meeting of our stockholders on May 25, 2000, which we
adjourned and re-convened on June 20, 2000. We have described below the results
of the voting on proposals submitted to our stockholders for a vote at the
annual meeting:

    a.  Proposal to elect one director for a term of office expiring in 2003:

<TABLE>
<CAPTION>
                                                           NUMBER OF VOTES
                                                        ----------------------
NOMINEE                                                    FOR       WITHHELD
-------                                                 ----------   ---------
<S>                                                     <C>          <C>
Henri A. Termeer
  Genzyme General Stock...............................  73,721,283   1,642,212
  Molecular Oncology Stock*...........................   1,003,382      11,655
  Surgical Products Stock**...........................   8,046,937     215,869
  Tissue Repair Stock***..............................   1,637,353      15,154
                                                        ----------   ---------
  Total...............................................  84,408,955   1,884,890
</TABLE>

       Mr. Termeer received a majority of the votes cast and, therefore, has
       been duly elected as a director of Genzyme. The terms in office of the
       following directors continued after the meeting:

       - Constantine E. Anagnostopoulos, Ph.D.;

       - Douglas A. Berthiaume;

       - Henry E. Blair;

       - Robert J. Carpenter; and

       - Charles L. Cooney, Ph.D.

                                       73
<PAGE>
    b.  Proposal to amend our 1990 Equity Incentive Plan to add 175,000 shares
       of Surgical Products Stock to be made available for issuance under the
       plan.

<TABLE>
<CAPTION>
                         NUMBER OF      NUMBER OF     NUMBER OF VOTES   NUMBER OF BROKER
                         VOTES FOR    VOTES AGAINST     ABSTAINING       NON-VOTES****
                         ----------   -------------   ---------------   ----------------
<S>                      <C>          <C>             <C>               <C>
Genzyme General Stock..  51,124,488    23,986,098         252,907              --
Molecular Oncology
  Stock*...............     937,341        74,141           3,554              --
Surgical Products
  Stock**..............   7,414,911       820,424          27,469              --
Tissue Repair
  Stock***.............   1,362,570       281,410           8,526              --
                         ----------    ----------         -------             ---
Total..................  60,839,310    25,162,073         292,456
</TABLE>

       The proposal received the affirmative vote of a majority in interest of
       the stock present, or represented, and entitled to vote and, therefore,
       has been adopted.

    c.  Proposal to amend our charter to modify the terms of the Molecular
       Oncology Stock, Surgical Products Stock and Tissue Repair Stock.

<TABLE>
<CAPTION>
                         NUMBER OF      NUMBER OF     NUMBER OF VOTES   NUMBER OF BROKER
                         VOTES FOR    VOTES AGAINST     ABSTAINING         NON-VOTES
                         ----------   -------------   ---------------   ----------------
<S>                      <C>          <C>             <C>               <C>
Genzyme General Stock..  55,668,021      316,909          261,347          19,559,370
Molecular Oncology
  Stock*...............     588,527       21,196            7,762             441,200
Surgical Products
  Stock**..............   5,492,636      400,837           43,945           2,876,226
Tissue Repair
  Stock***.............     860,237       36,739           13,231             755,058
                         ----------      -------          -------          ----------
Total..................  62,609,421      775,681          326,285          23,631,854
</TABLE>

       The proposal received the affirmative vote of a majority in interest of
       all shares outstanding and entitled to vote and, therefore, has been
       adopted.

    d.  Votes of holders of shares of Molecular Oncology Stock on the proposal
       to amend our charter to modify the terms of the Molecular Oncology Stock.

<TABLE>
<CAPTION>
                          NUMBER OF     NUMBER OF     NUMBER OF VOTES   NUMBER OF BROKER
                          VOTES FOR   VOTES AGAINST     ABSTAINING         NON-VOTES
                          ---------   -------------   ---------------   ----------------
<S>                       <C>         <C>             <C>               <C>
Molecular Oncology
  Stock.................  7,356,596      264,953          97,036           5,515,003
</TABLE>

       The proposal received the affirmative vote of a majority in interest of
       all shares of Molecular Oncology Stock outstanding and entitled to vote
       and, therefore, has been adopted for Molecular Oncology Stock.

    e.  Votes of holders of shares of Surgical Products Stock on the proposal to
       amend our charter to modify the terms of the Surgical Products Stock.

<TABLE>
<CAPTION>
                          NUMBER OF     NUMBER OF     NUMBER OF VOTES   NUMBER OF BROKER
                          VOTES FOR   VOTES AGAINST     ABSTAINING         NON-VOTES
                          ---------   -------------   ---------------   ----------------
<S>                       <C>         <C>             <C>               <C>
Surgical Products
  Stock.................  9,004,322      657,111          72,041           4,715,125
</TABLE>

       The proposal received the affirmative vote of a majority in interest of
       all shares of Surgical Products Stock outstanding and entitled to vote
       and, therefore, has been adopted for Surgical Products Stock.

                                       74
<PAGE>
    f.  Votes of holders of shares of Tissue Repair Stock on the proposal to
       amend our charter to modify the terms of the Tissue Repair Stock.

<TABLE>
<CAPTION>
                         NUMBER OF      NUMBER OF     NUMBER OF VOTES   NUMBER OF BROKER
                         VOTES FOR    VOTES AGAINST     ABSTAINING         NON-VOTES
                         ----------   -------------   ---------------   ----------------
<S>                      <C>          <C>             <C>               <C>
Tissue Repair Stock....  14,337,287      612,329          220,532          12,584,310
</TABLE>

       The proposal received the affirmative vote of a majority in interest of
       all shares of Tissue Repair Stock outstanding and entitled to vote and,
       therefore, has been adopted for Tissue Repair Stock.

       -------------------------------

       *   Represents the actual number of shares of Molecular Oncology Stock
           voted multiplied by .08.

       **  Represents the actual number of shares of Surgical Products Stock
           voted multiplied by .61.

       *** Represents the actual number of shares of Tissue Repair Stock voted
           multiplied by .06.

       ****For this purpose, abstentions and broker non-votes are not counted.

ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

    (a) Exhibits

<TABLE>
<S>     <C>
3.1     Restated Articles of Organization of Genzyme. Filed as
        Exhibit 1 to Genzyme's Current Report on Form 8-K filed on
        June 30, 2000 (File No. 0-14680), and incorporated herein by
        reference.
10.1    Amended and Restated Collaboration Agreement dated as of
        April 1, 2000 by and between Genzyme, GelTex
        Pharmaceuticals, Inc. and RenaGel LLC. Filed as Exhibit 10.1
        to GelTex's Quarterly Report on Form 10-Q for the quarter
        ended June 30, 2000 (File No. 0-26872) and incorporated
        herein by reference.
10.2    Amended and Restated Operating Agreement of RenaGel LLC
        dated as of April 1, 2000 by and between Genzyme, GelTex
        Pharmaceuticals, Inc. and RenaGel, Inc. Filed as
        Exhibit 10.2 to GelTex's Quarterly Report on Form 10-Q for
        the quarter ended June 30, 2000 (File No. 0-26872) and
        incorporated herein by reference.
27      Financial Data Schedule for Genzyme for the six months ended
        June 30, 2000 (for EDGAR filing purposes only). Filed
        herewith.
</TABLE>

    (b) Reports on Form 8-K

    We filed a Current Report on Form 8-K, dated June 30, 2000, to report upon
the filing with the Secretary of the Commonwealth of Massachusetts and the
effectiveness of an amendment to our corporate charter modifying the terms of
three of the four series of our common stock.

    We filed a Current Report on Form 8-K, dated July 14, 2000, for the purpose
of filing an opinion of counsel with respect to the validity of 1,464,100 shares
of Molecular Oncology Stock being offering pursuant to a Registration Statement
on Form S-3.

    We filed a Current Report on Form 8-K, dated July 17, 2000, for the purpose
of filing an updated opinion of counsel with respect to the validity of
1,607,400 shares of Molecular Oncology Stock being offered pursuant to a
Registration Statement on Form S-3.

                                       75
<PAGE>
                                   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.

<TABLE>
<S>                                                    <C>  <C>
                                                       GENZYME CORPORATION

DATE: August 14, 2000                                  By:  /s/ MICHAEL S. WYZGA
                                                            -----------------------------------------
                                                            Michael S. Wyzga
                                                            SENIOR VICE PRESIDENT FINANCE,
                                                            CHIEF FINANCIAL OFFICER,
                                                            CORPORATE CONTROLLER AND CHIEF ACCOUNTING
                                                            OFFICER
</TABLE>

                                       76
<PAGE>
                                 EXHIBIT INDEX

<TABLE>
<S>      <C>
3.1      Restated Articles of Organization of Genzyme. Filed as
         Exhibit 1 to Genzyme's Current Report on Form 8-K filed on
         June 30, 2000 (File No. 0-14680), and incorporated herein by
         reference.

10.1     Amended and Restated Collaboration Agreement dated as of
         April 1, 2000 by and between Genzyme, GelTex
         Pharmaceuticals, Inc. and RenaGel LLC. Filed as
         Exhibit 10.1 to GelTex's Quarterly Report on Form 10-Q for
         the quarter ended June 30, 2000 (File No. 0-26872) and
         incorporated herein by reference.

10.2     Amended and Restated Operating Agreement of RenaGel LLC
         dated as of April 1, 2000 by and between Genzyme, GelTex
         Pharmaceuticals, Inc. and RenaGel, Inc. Filed as
         Exhibit 10.2 to GelTex's Quarterly Report on Form 10-Q for
         the quarter ended June 30, 2000 (File No. 0-26872) and
         incorporated herein by reference.

27       Financial Data Schedule for Genzyme for the six months ended
         June 30, 2000 (for EDGAR filing purposes only). Filed
         herewith.
</TABLE>


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