EXHIBIT 99.2

                   FACTORS AFFECTING FUTURE OPERATING RESULTS

         From time to time, we or our management may make forward-looking
statements about our operations. These statements are based upon the assumptions
of our management at the time they are made and are only expectations of future
results. These statements are also subject to risks and uncertainties, and our
actual results may differ significantly than those described in the
forward-looking statements. These risks and uncertainties are described below.

         In this document, 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" or "our board" refer to the board of directors of
Genzyme Corporation. In addition, we refer to our four operating divisions as
follows:

        o    Genzyme General Division = Genzyme General
        o    Genzyme Molecular Oncology Division = Genzyme Molecular Oncology
        o    Genzyme Surgical Products Division = Genzyme Surgical Products
        o    Genzyme Tissue Repair Division = Genzyme Tissue Repair

         We also refer to the series of Genzyme common stock that reflect the
value and track the performance of these divisions by their Nasdaq trading
symbols:

        o    Genzyme General Division Common Stock = GENZ Stock
        o    Genzyme Molecular Oncology Division Common Stock = GZMO Stock
        o    Genzyme Surgical Products Division Common Stock = GZSP Stock
        o    Genzyme Tissue Repair Division Common Stock = GZTR Stock

                            RISKS RELATED TO GENZYME

         The following risk factors relate to us generally and affect all of
our operating divisions

A REDUCTION IN REVENUES FROM SALES OF PRODUCTS THAT TREAT GAUCHER DISEASE WOULD
HAVE AN ADVERSE EFFECT ON OUR BUSINESS.

         We generate a majority of our product revenues from sales of
enzyme-replacement products for patients with Gaucher disease. We entered this
market in 1991 with Ceredase-Registered Trademark- enzyme. Because production of
Ceredase-Registered Trademark- enzyme was subject to supply constraints, we
developed Cerezyme-Registered Trademark- enzyme, a recombinAnt form of the
enzyme. Recombinant technology uses specially engineered cells to produce
enzymes, or other substances, by inserting into the cells of one organism the
genetic material of a different species. In the case of Cerezyme-Registered
Trademark- enzyme, Chinese hamster ovary cells are engineered to produce human
alpha glucocerebrosidase. We stopped producing Ceredase-Registered Trademark-
enzyme, except for small quantities, during 1998, after substantially all the
patients who previously used Ceredase-Registered Trademark- enzyme converted to
Cerezyme-Registered Trademark- enzyme. Sales of Ceredase-Registered Trademark-
enzyme and Cerezyme-Registered Trademark- enzyme totaled $478.5 million for the
year ended December 31, 1999, representing approximately 70% of our product
revenues for that year.

         Because our business is highly dependent on Cerezyme-Registered
Trademark- enzyme, a reduction in revenue from sales of this product would have
an adverse effect on oUr operations and may cause the value of our securities to
decline substantially. Revenues from Cerezyme-Registered Trademark- enzyme would
be impacted negatively if competitors develop alternative treatments for Gaucher
disease and these alternative products gained commercial acceptance. Some
companies have initiated efforts to develop competitive products, and other
companies may do so in the future. Cerezyme-Registered Trademark- enzyme has
orphan drug status, providing it with market exclusivity iN the U.S. until May
2001. We also have patents protecting its manufacturing method until 2010 and
its composition until 2013. We cannot predict the effect that the expiration of
orphan drug status and market exclusivity will have on sales of
Cerezyme-Registered Trademark- enzyme after May 2001.





GOVERNMENT REGULATION IMPOSES SIGNIFICANT COSTS AND RESTRICTIONS ON THE
DEVELOPMENT AND COMMERCIALIZATION OF OUR PRODUCTS AND SERVICES.

         Our ability to successfully satisfy regulatory requirements will
significantly determine our future success. We cannot guarantee that any
required regulatory approvals will be granted or that they will be granted on a
timely basis. The production and sale of healthcare products and provision of
health care services are highly regulated. In particular, the U.S. Food and Drug
Administration (FDA) and comparable agencies in foreign countries must approve
human therapeutic and diagnostic products before they are marketed. This
approval process can involve lengthy and detailed laboratory and clinical
testing, sampling activities and other costly and time-consuming procedures.
This regulation may delay the time at which a product or service first can be
sold, limit how a product or service may be used, or adversely impact third
party reimbursement. In addition, therapies that have received, or in the future
receive, regulatory approval for commercial sale may still face subsequent
regulatory difficulties. The FDA and comparable foreign regulatory agencies, for
example, may require postmarketing clinical trials. In addition, a marketed
therapy, its manufacturer and the manufacturer's facilities are subject to
continual review and periodic inspections by regulatory agencies. The discovery
of previously unknown problems with a therapy, manufacturer or facility can
result in restrictions on the therapy or manufacturer, including withdrawal of
the therapy from the market. The failure to comply with applicable regulatory
approval requirements can result in, among other things:

        o    warning letters;

        o    fines and other civil penalties;

        o    suspended regulatory approvals;

        o    refusal to approve pending applications or supplements to approved
             applications;

        o    suspension of product sales in the U.S. and/or exports from the
             U.S.;

        o    product recalls; and

        o    seizure of products.

LEGISLATIVE CHANGES MAY ADVERSELY IMPACT OUR BUSINESS.

         Some of our products, including Cerezyme-Registered Trademark- enzyme,
have been designated as orphan drugs under the Orphan Drug Act. The Orphan Drug
Act provides incentives to manufacturers to develop and market drugs for rare
diseases, generally by entitling the first developer that receives FDA marketing
approval for an orphan drug to a seven-year exclusive marketing period in the
U.S. for that product. Legislation periodically has been introduced in recent
years to change the Orphan Drug Act to shorten the period of automatic market
exclusivity and to allow marketing rights to simultaneous developers of the
drug. We cannot be sure whether the Orphan Drug Act will be amended, or if
amended, what effect the changes may have on us.

         We have also received orphan drug designation for some of our
products that are still in development, including Fabrazyme-TM- enzyme for
the treatment of Fabry disease. We are aware of other companies developing
products for the treatment of Fabry disease. If any of those companies
receive FDA approval for their Fabry disease therapy before we receive FDA
approval for Fabrazyme-TM- enzyme, the Orphan Drug Act will preclude us from
selling Fabrazyme-TM- enzyme in the U.S. for up to seven years.

         In addition, healthcare reform is an area of significant government
focus. Any reform measures, if adopted, could adversely affect:

         o   the pricing of therapeutic products in the U.S. or internationally;
             and

         o   the amount of reimbursement available from governmental agencies or
             other third party payers.

BECAUSE THE DEVELOPMENT OF OUR PRODUCTS INVOLVES A LENGTHY AND COMPLEX PROCESS,
IT IS UNCERTAIN WHETHER WE WILL BE ABLE TO COMMERCIALIZE ANY OF OUR PRODUCTS
CURRENTLY IN DEVELOPMENT.

         Before we can commercialize our development-stage products, we will
need to:


                                       2



         o   conduct substantial research and development;

         o   undertake preclinical and clinical testing; and

         o   pursue regulatory approvals.

         This process involves a high degree of risk and takes several years.
Our product development efforts may fail for many reasons, including:

         o   the product fails in preclinical studies;

         o   clinical trials may not support the safety or effectiveness of the
             product; or

         o   we fail to obtain the required regulatory approvals.

         We cannot guarantee that we will successfully develop any particular
product.

ANY MARKETABLE PRODUCTS THAT WE DEVELOP MAY NOT BE COMMERCIALLY SUCCESSFUL.

         The commercial success of any marketable product that we develop will
depend on many factors, including:

         o   regulation by the FDA and other government authorities;

         o   market acceptance by doctors and hospital administrators;

         o   the effectiveness of our sales force;

         o   the effectiveness of our production and marketing capabilities;

         o   the success of competitive products; and

         o   the availability of third party reimbursement.

WE MAY REQUIRE SIGNIFICANT ADDITIONAL FINANCING WHICH MAY NOT BE AVAILABLE ON
FAVORABLE TERMS, IF AT ALL.

         As of December 31, 1999, we had approximately $653.0 million in cash,
cash equivalents and short-  and long-term investments, excluding investments
in equity securities.

         Although we currently have substantial cash resources and positive cash
flow, we intend to use substantial portions of our available cash for:

         o   product development and marketing;

         o   expanding facilities;

         o   working capital; and

         o   strategic business initiatives.

         We will further reduce available cash reserves to pay principal and
interest on the following debt:

         o   In May 1998, we issued $250.0 million in convertible notes, the
             entire principal amount of which is allocated to Genzyme General.
             These convertible notes bear interest at an annual rate of 5.25%
             and mature on June 1, 2005. However, the holders of these notes may
             exchange principal on the notes for shares of GENZ Stock, GZMO
             Stock, and GZSP Stock.


                                       3


         o   As of December 31, 1999, we owed approximately $23.0 million under
             a revolving credit facility with a group of commercial banks. Of
             this amount, we have allocated $18.0 million to Genzyme Tissue
             Repair and $5.0 million to Genzyme Molecular Oncology. Amounts
             borrowed under this revolving credit facility bear interest at a
             floating rate based upon an applicable margin above either the
             prime rate announced by Fleet National Bank or the London InterBank
             Offered Rate. We must repay all borrowings under this facility no
             later than November 12, 2002.

         o   In August 1998, we issued $21.2 million in convertible debentures,
             the entire principal amount of which is allocated to Genzyme
             General. These convertible debentures bear interest at an annual
             rate of 5% and mature on August 29, 2003, but the holders of these
             convertible debentures may exchange principal, and under some
             circumstances interest, on the convertible debentures for shares of
             GENZ Stock.

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

         In March 2000, we entered into an agreement to acquire Biomatrix, Inc.
The consideration for the proposed acquisition consists of shares of a new
series of our common stock and up to approximately $245 million in cash,
allocated at the option of Biomatrix stockholders. To the extent we use cash to
complete this acquisition, our cash reserves will be diminished.

         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.

WE MAY FAIL TO PROTECT ADEQUATELY OUR PROPRIETARY TECHNOLOGY, WHICH WOULD ALLOW
COMPETITORS TO TAKE ADVANTAGE OF OUR RESEARCH AND DEVELOPMENT EFFORTS.

         Our long-term success largely depends on our ability to obtain and
maintain patent and other proprietary right protection for our technology and
products. If we fail to obtain or maintain these protections, we may not be able
to prevent third parties from using our proprietary rights.

         Patents based on our currently pending or our future patent
applications may not issue. In addition, our issued patents may not contain
claims sufficiently broad to protect us against third parties with similar
technologies or products, or provide us with any competitive advantage. Further,
our patents, our collaborators' patents, and those patents for which we have
license rights may be challenged, narrowed, invalidated or circumvented.

         The U.S. Patent and Trademark Office and the courts have not
established a consistent policy regarding the breadth of claims allowed in
biotechnology patents. The allowance of broader claims may increase the
incidence and cost of patent interference proceedings and the risk of
infringement litigation. On the other hand, the allowance of narrower claims
may limit the value of our proprietary rights. Any policies that are adopted
may result in changes in or interpretations of the patent laws that adversely
affect our patent position.

         We also rely upon trade secrets, proprietary know-how, and continuing
technological innovation to remain competitive. We have taken measures to
protect our trade secrets and know-how, including the use of confidentiality
agreements with our employees, consultants and corporate collaborators. It is
possible that these agreements may be breached and that any remedies for a
breach will not make us whole. We also cannot guarantee that other parties will
not independently develop our know-how or otherwise obtain access to our
technology.

WE MAY BE REQUIRED TO LICENSE TECHNOLOGY FROM COMPETITORS IN ORDER TO DEVELOP
AND COMMERCIALIZE SOME OF OUR PRODUCTS AND SERVICES, AND IT IS UNCERTAIN WHETHER
THESE LICENSES WILL BE AVAILABLE.

         Third party patent rights and pending patent applications filed by
third parties, if issued, may cover some of the products that we or our
strategic collaborators are developing or testing. As a result, we or a
strategic collaborator may be required to obtain licenses from the holders of
these patents in order to use, manufacture or sell


                                       4



these products and services, and payments under these licenses may reduce the
profitability of the products. Furthermore, we cannot be sure that these
licenses would be available to us on acceptable terms or at all. If these
licenses are not available, our or our strategic collaborators' ability to
commercialize these products and services may be impaired.

WE MAY INCUR SUBSTANTIAL COSTS AS A RESULT OF LITIGATION OR OTHER PROCEEDINGS
RELATING TO PATENT AND OTHER INTELLECTUAL PROPERTY RIGHTS.

         If we or one of our strategic collaborators initiate litigation to
enforce our patent or license rights, or are required to defend these rights in
response to third party claims, it could consume a substantial portion of our
resources. We cannot guarantee that we or our strategic collaborator would
prevail in such litigation. If we do not prevail, we or our strategic
collaborators may be required to:

         o   pay monetary damages;

         o   stop commercial activities relating to the affected products or
             services; or

         o   obtain a license in order to continue manufacturing or marketing
             the affected products or services.

         If we are required to pay damages or if commercial activities are
disrupted, our business or financial position may be negatively impacted. In
addition, if we or our strategic collaborators are required to obtain a license,
we cannot guarantee that one would be made available to us or made available on
acceptable terms or at all.

WE MAY BE LIABLE FOR PRODUCT LIABILITY CLAIMS NOT COVERED BY INSURANCE.

         Individuals who use our products or services may bring product
liability claims against us. While we have taken, and continue to take, what we
believe are appropriate precautions, we cannot guarantee that we will avoid
significant liability exposure. We have only limited amounts of product
liability insurance, and we cannot be sure that this insurance will provide
sufficient coverage against any product liability claims. If we attempt to
obtain additional insurance in the future, we may not be able to do so on
acceptable terms, and any additional insurance we do obtain may not provide
adequate coverage against any asserted claims. In addition, regardless of merit
or eventual outcome, product liability claims may result in:

         o   diversion of management time and attention;

         o   expenditure of large amounts of cash on legal fees, expenses and
             payment of damages;

         o   decreased demand for our products and services; and

         o   injury to our reputation.

OUR COMPETITORS IN THE BIOTECHNOLOGY AND PHARMACEUTICAL INDUSTRIES MAY HAVE
SUPERIOR PRODUCTS, MANUFACTURING CAPABILITIES OR MARKETING EXPERTISE.

         The human health care products and services industry is extremely
competitive. Our competitors include major pharmaceutical companies and other
biotechnology companies. Some of these competitors may have more extensive
research and development, marketing and production capabilities. Some
competitors also may have greater financial resources than us. Our future
success will depend on our ability to develop and market effectively our
products against those of our competitors.

IF WE ARE UNABLE TO KEEP UP WITH RAPID TECHNOLOGICAL CHANGES, OUR PRODUCTS OR
SERVICES MAY BECOME OBSOLETE.

         The field of biotechnology is characterized by significant and rapid
technological change. Although we attempt to expand our technological
capabilities in order to remain competitive, research and discoveries by others


                                       5



may make our products or services obsolete. For example, some of our competitors
may develop a product to treat Gaucher disease that is more effective or less
expensive than Cerezyme-Registered Trademark- enzyme.

IF WE FAIL TO OBTAIN ADEQUATE LEVELS OF REIMBURSEMENT FOR OUR PRODUCTS FROM
THIRD PARTY PAYERS, THE COMMERCIAL POTENTIAL OF OUR PRODUCTS WILL BE
SIGNIFICANTLY LIMITED.

         A substantial portion of our revenue comes from payments by third party
payers, including government health administration authorities and private
health insurers. Third party payers may not reimburse patients for newly
approved healthcare products. Increasingly, third party payers are attempting
to contain health care costs by:

         o   challenging the prices charged for healthcare products and
             services;

         o   limiting both coverage and the amount of reimbursement for new
             therapeutic products;

         o   denying or limiting coverage for products that are approved by the
             FDA, but are considered experimental or investigational by third
             party payers; and

         o   refusing, in some cases, to provide coverage when an approved
             product is used for disease indications in a way that has not
             received FDA marketing approval.

         Government and other third party payers may not provide adequate
insurance coverage or reimbursement for our products and services, which could
impair our financial results.

         In addition, Congress occasionally has discussed implementing
broad-based measures to contain healthcare costs. It is possible that Congress
will enact legislation specifically designed to contain healthcare costs. We
cannot predict the effect that legislation of this type would have on our
business.

CHANGES IN THE ECONOMIC, POLITICAL, LEGAL AND BUSINESS ENVIRONMENTS IN THE
FOREIGN COUNTRIES IN WHICH WE DO BUSINESS COULD CAUSE OUR INTERNATIONAL SALES
AND OPERATIONS, WHICH ACCOUNT FOR A SIGNIFICANT PERCENTAGE OF OUR CONSOLIDATED
NET SALES, TO BE LIMITED OR DISRUPTED.

         Our international operations accounted for 41% of our consolidated
revenues in 1999 and 1998, and we expect that international sales will continue
to account for a significant percentage of our revenues for the foreseeable
future. In addition, we have direct investments in a number of subsidiaries
outside of the U.S., primarily in Europe and Japan. Our international sales and
operations could be limited or disrupted, and the value of our direct
investments may be adversely affected, by any of the following:

         o   fluctuations in currency exchange rates;

         o   the imposition of government controls;

         o   less favorable intellectual property or other applicable laws;

         o   the inability to obtain any necessary foreign regulatory approvals
             of products in a timely manner;

         o   import and export license requirements;

         o   political instability;

         o   trade restrictions;

         o   changes in tariffs;

         o   difficulties in staffing and managing international operations; and


                                       6



         o   longer payment cycles.

         A significant portion of our business is conducted in currencies other
than the U.S. dollar, which is our reporting currency. We recognize foreign
currency gains or losses arising from our operations in the period incurred. As
a result, currency fluctuations among the U.S. dollar and the currencies in
which we do business have caused foreign currency transaction gains and losses
in the past and will likely do so in the future. We cannot predict the effects
of exchange rate fluctuations upon our future operating results because of the
number of currencies involved, the variability of currency exposures and the
potential volatility of currency exchange rates.

SEVERAL ANTI-TAKEOVER PROVISIONS MAY DEPRIVE OUR STOCKHOLDERS OF THE OPPORTUNITY
TO RECEIVE A PREMIUM FOR THEIR SHARES UPON A CHANGE IN CONTROL.

         Provisions of Massachusetts law and our charter, by-laws and
shareholder rights plan could delay or prevent a change in control of Genzyme or
a change in our management.

         Our tracking stock structure may also deprive our stockholders of the
opportunity to receive a premium for their shares upon a change in control
because, in order to obtain control of a particular division, an acquiror would
have to obtain control of the entire corporation.

         In addition, our board of directors may, in their sole discretion:

         o   exchange shares of GZMO Stock, GZSP Stock or GZTR Stock for GENZ
             Stock at a 30% premium over the market value of the exchanged
             shares; and

         o   issue shares of undesignated preferred stock from time to time in
             one or more series.

         Either of these board actions could increase the cost of an acquisition
of Genzyme and thus discourage a takeover attempt.

                    RISKS RELATED TO GENZYME TRACKING STOCKS

         We have four series of tracking stock: GENZ Stock, GZMO Stock, GZSP
Stock and GZTR Stock.  The following are risks related to owning shares of our
tracking stock.

HOLDERS OF OUR TRACKING STOCK ARE STOCKHOLDERS OF A SINGLE COMPANY AND
UNFAVORABLE FINANCIAL TRENDS AFFECTING ONE DIVISION COULD NEGATIVELY AFFECT OUR
OTHER DIVISIONS.

         None of our divisions are separate legal entities. Holders of our
tracking stock are stockholders of a single company and face all of the risks of
an investment in Genzyme.

         For purposes of financial presentation, we allocate programs, products,
assets and liabilities among our four divisions. Genzyme Corporation, however,
continues to own all of the assets and is responsible for all of the liabilities
of each division. A holder of GENZ Stock, for example, does not have any
specific rights to the assets allocated to Genzyme General in our financial
statements. Furthermore, if we are unable to satisfy one division's liabilities
out of the assets we allocate to that division, we may be required to satisfy
those liabilities with assets we have allocated to another division.
Accordingly, we encourage you to review our consolidated financial statements
and the financial statements of each of our divisions included in the reports
that we file with the SEC.

OUR BOARD OF DIRECTORS MAY TAKE ACTIONS THAT, WHILE IN THE BEST INTERESTS OF
GENZYME AS A WHOLE, HAVE AN UNEQUAL AND ADVERSE EFFECT ON THE HOLDERS OF ONE OR
MORE SERIES OF OUR TRACKING STOCK.

         There may be times when the interests of holders of each series of our
common stock diverge or appear to diverge. Massachusetts law does not define a
board of directors' duties in that situation. Based on the advice of counsel,
however, we believe that a Massachusetts court would conclude that a board of
directors owes an equal duty to all stockholders regardless of class or series
and does not have separate or additional duties to any particular


                                       7



group of stockholders. That duty is the fiduciary duty to act in good faith and
in a manner the board reasonably believes to be in the best interests of the
corporation. Under Massachusetts law, if a disinterested and adequately informed
board of directors determines in good faith that an action would be in the
corporation's best interests, taking into account both the interests of holders
of each series of tracking stock as well as the alternatives reasonably
available, then the board of directors should be able to successfully defend
against any stockholder claim that the action could have an unequal effect on
different series of tracking stock.

         In March 1999, the Delaware Court of Chancery, in two separate cases,
dismissed all stockholder claims that the board of directors had violated its
fiduciary duties under Delaware law by approving actions that had a disparate
impact on holders of different classes of tracking stock. The court indicated in
each case that even where the decision of the board of directors affected
holders of separate classes of tracking stock differently, stockholders must
allege facts sufficient to indicate that a board of directors' approval was not
based on the good faith belief that the approved actions were in the
corporation's best interests. While Delaware case law is not binding on a
Massachusetts court, we believe that a Massachusetts court would be influenced
by these decisions in addressing similar issues. A Massachusetts court hearing a
case, however, may apply principles of Massachusetts law other than those
described above or develop new principles of Massachusetts law to decide the
case.

MEMBERS OF OUR BOARD OF DIRECTORS MAY FAVOR ONE SERIES OF TRACKING STOCK OVER
ANOTHER IF THEY OWN A DISPROPORTIONATE AMOUNT OF THAT SERIES.

         A member of our board may own a disproportionate amount of tracking
stock in a particular series, or the value of his or her holdings of a
particular series of stock may be different from the value of his or her
holdings in another series. This disparate stock ownership may cause the board
member to favor one series of stock over another. Nevertheless, we believe that
a member of our board could properly discharge his or her fiduciary
responsibilities even if his or her interests in shares of different series were
disproportionate or of unequal values. Our board members may create committees
to review matters that raise conflict-of-interest issues. If a committee is
formed, it would report to the full board.

HOLDERS OF OUR TRACKING STOCK HAVE LIMITED DECISION-MAKING POWER BECAUSE THEY
HAVE LIMITED SEPARATE VOTING RIGHTS.

         Holders of all series of our tracking stock vote together as a single
class on all matters requiring common stockholder approval, including the
election of directors. Holders of one series of tracking stock do not have the
right to vote on matters separately from the other series except in limited
circumstances. These circumstances are dictated by Massachusetts law, our
charter and the management and accounting policies adopted by our board of
directors. Therefore, stockholders of one series of tracking stock generally
could not make a proposal that would require approval only of the holders of
that series. Instead, they would have to obtain approval from all common
stockholders.

THE LIQUIDATION RIGHTS FOR EACH SERIES OF TRACKING STOCK ARE NOT ADJUSTED TO
REFLECT CHANGES IN THE SERIES' MARKET VALUE.

         If we dissolve, liquidate or wind up our affairs, other than as part of
a merger, business combination or sale of substantially all of our assets, our
stockholders will receive any remaining assets according to the percentage of
total liquidation units that they hold. The number of liquidation units per
share for each series of our tracking stock is as follows:

         o   each share of GENZ Stock has 100 liquidation units;

         o   each share of GZMO Stock has 25 liquidation units;

         o   each share of GZSP Stock has 61 liquidation units; and

         o   each share of GZTR Stock has 58 liquidation units.


                                       8



         Although we adjust liquidation units to prevent dilution in the event
of some subdivisions, combinations or distributions of common stock, we do not
adjust them to reflect changes in the relative market value or performance of
the divisions. Accordingly, at the time of a dissolution, liquidation or winding
up, the relative liquidation units attributable to each series of tracking stock
may not correspond to the value of the underlying assets of that division.

OUR BOARD OF DIRECTORS MAY CHANGE OUR MANAGEMENT AND ACCOUNTING POLICIES TO THE
DETRIMENT OF ONE SERIES OF TRACKING STOCK WITHOUT STOCKHOLDER APPROVAL.

         Our board of directors has adopted management and accounting policies
that are used to govern our business and to prepare our financial statements.
These policies cover the allocation of corporate expenses, assets and
liabilities and other accounting matters, and the reallocation of assets between
divisions and other matters. Our board generally may modify or rescind these
policies or adopt new ones without stockholder approval. Any revised policies
could have different effects on each series of our tracking stock and could be
detrimental to one series as compared to another. The discretion of our board to
make changes is limited only by the policies themselves and the board's
fiduciary duty to all of our stockholders. We encourage you to review the full
text of these policies, which are filed as Exhibit 99.1 to our registration
statement on Form S-3 filed on March 3, 2000.

WE MAY ELIMINATE TRACKING STOCK IF A CORPORATE OR SHAREHOLDER LEVEL TAX IS
IMPOSED ON THE ISSUANCE OR RECEIPT OF TRACKING STOCK.

         In 1999, the Clinton Administration proposed legislation that would
have imposed a corporate level tax on issuances of tracking stock. More
recently, the Clinton Administration has proposed legislation that would tax
stockholders upon the receipt of tracking stock from the issuing corporation as
a distribution or in a recapitalization. Although Congress has not enacted
either of these proposals into law, if these or similar proposals are enacted
into law or effected through Treasury regulations in the future, we could be
taxed on an amount up to the gain realized in future financings in which we sell
tracking stock, including GENZ Stock. Also, any use of our tracking stock to
acquire other companies could be taxed. We also may be taxed if we distribute to
stockholders "designated" shares of tracking stock, which are shares designated
by the tracked division as issuable at the option of our board for Genzyme
General's benefit. In addition, stockholders could be taxed if they receive a
distribution of designated shares of tracking stock or if they receive shares of
tracking stock in exchange for other Genzyme stock. These or similarly adverse
tax consequences could cause us to eliminate tracking stock from our capital
structure. We cannot predict, however, whether Congress will enact legislation,
or the Treasury Department will issue regulations, effecting these or similar
proposals.

THE USE OF OPERATING LOSSES TO LOWER THE REPORTED TAX LIABILITY OF OUR
PROFITABLE DIVISIONS WILL CAUSE LOWER REPORTED EARNINGS IN THE FUTURE FOR THE
DIVISIONS GENERATING THESE OPERATING LOSSES.

         Genzyme Corporation, rather than its divisions, is liable for taxes.
Under our management and accounting policies, for financial reporting purposes
we generally allocate taxes among our divisions as if they were separate
taxpayers. However, our board of directors has adopted a policy that provides
that if any of our divisions is unable to use our operating losses or other
projected annual tax benefits to reduce our current or deferred income tax
expense, we may reallocate these losses or benefits to our profitable divisions
on a quarterly basis for financial reporting purposes. This will result in a
division with current losses (such as Genzyme Molecular Oncology, Genzyme
Surgical Products and Genzyme Tissue Repair) reporting lower earnings available
to its common stockholders in the future than would be the case if that division
had retained its historical losses or other benefits in the form of a net
operating loss carryforward. We encourage you to review full text of this
policy, which is filed as Exhibit 99.1 to our registration statement on Form S-3
filed on March 3, 2000.

THE NON-COMPETE POLICY AMONG OUR DIVISIONS MAY NOT COVER ALL OF THE ACTIVITIES
OF A PARTICULAR DIVISION.

         Our board of directors has adopted a policy regarding competition among
our divisions. This non-compete policy requires that we develop certain products
and services within a given division, as opposed to another division, or through
joint ventures involving a given division, because the product or service is
within the field of activity of that division. This non-compete policy, however,
does not cover the entire field of activity of each division. For example,
Genzyme General Division or Genzyme Molecular Oncology may develop certain
tissue repair products or services. In order words, we cannot guarantee that all
products and services we develop in a given field of activity



                                       9



will be allocated to a division primarily engaged in that field of activity. We
encourage you to review full text of this policy, which is filed as Exhibit 99.1
to our registration statement on Form S-3 filed on March 3, 2000.

FUTURE SALES OR DISTRIBUTIONS OF DESIGNATED SHARES OF GZMO STOCK, GZSP STOCK OR
GZTR STOCK MAY SIGNIFICANTLY DILUTE YOUR OWNERSHIP OF THE AFFECTED SHARES OF
TRACKING STOCK.

         Our management and accounting policies require us to sell or distribute
any designated shares of GZMO Stock, GZSP Stock or GZTR Stock that may be
created, subject to certain limitations. Proceeds from a sale or distribution
will not be allocated to the affected divisions and the issuance and sale may
substantially dilute your ownership of tracking stock of the affected divisions.

                        RISKS RELATING TO GENZYME GENERAL

         The following risks and uncertainties may adversely affect the business
of Genzyme General.

A REDUCTION IN REVENUES FROM SALES OF PRODUCTS THAT TREAT GAUCHER DISEASE WOULD
HAVE AN ADVERSE EFFECT ON GENZYME GENERAL'S BUSINESS.

         Genzyme General generates a majority of our product revenues from sales
of Ceredase-Registered Trademark- enzyme and Cerezyme-Registered Trademark-
enzyme, which are products for patients with Gaucher disease. Sales of
Ceredase-Registered Trademark- enzyme and Cerezyme-Registered Trademark- enzyme
totaled $478.5 million for the year ended December 31, 1999, representing
approxImately 84% of Genzyme General's product revenues for that year.

         Because Genzyme General's business is highly dependent on
Cerezyme-Registered Trademark- enzyme, a reduction in revenue from sales of this
product would have an adverSe effect on its operations and may cause the value
of GENZ Stock to decline substantially. Revenues from Cerezyme-Registered
Trademark- enzyme would be impacted negatively if competitors develop
alternative treatments for Gaucher disease and these alternative products gained
commercial acceptance. Some companies have initiated efforts to develop
competitive products, and other companies may do so in the future.
Cerezyme-Registered Trademark- enzyme has orphan drug status, providing it with
market exclusivity in the U.S. until May 2001. We also have patents protecting
its manufacturing method until 2010 and its composition until 2013. We cannot
predict the effect that the expiration of orphan drug status and market
exclusivity will have on sales of Cerezyme-Registered Trademark- enzyme after
May 2001.

GENZYME GENERAL MAY NOT BE ABLE TO SUCCESSFULLY COMMERCIALIZE
THYROGEN-Registered Trademark- HORMONE AND RENAGEL-Registered Trademark-
CAPSULES.

         In January 1999, Genzyme General, together with Knoll Pharmaceutical
Company, launched U.S. sales of Thyrogen-Registered Trademark- recombinant
thyroid stimulating hormone for use in the treatment of thyroid cancer. At about
the same time, Genzyme General, in collaboration with GelTex Pharmaceuticals,
Inc., launched Renagel-Registered Trademark- capsules, a non-absorbed phosphate
binder used in the treatment of end-stage renal disease. The commercial success
of Thyrogen-Registered Trademark- hormone and REnagel-Registered Trademark-
capsules will depend on a number of factors, including:

         o   regulation by the FDA;

         o   the ability to obtain regulatory approvals in foreign countries;

         o   the development and commercial success of competitive products; and

         o   the availability of third party reimbursement.

         Genzyme General cannot be sure that market penetration of
Thyrogen-Registered Trademark- hormone and Renagel-Registered Trademark-
capsules will increase.


                                       10



IF THE STRATEGIC COLLABORATIONS GENZYME GENERAL HAS ENTERED INTO TO DEVELOP AND
COMMERCIALIZE ITS PRODUCTS ARE NOT SUCCESSFUL, GENZYME GENERAL'S RESULTS OF
OPERATIONS WILL BE ADVERSELY IMPACTED.

         Several of Genzyme General's strategic initiatives involve
collaborations with other biotechnology companies and arrangements with academic
medical centers. These include:

         o   a joint venture with GelTex Pharmaceuticals, Inc. for the
             commercialization of Renagel-Registered Trademark- capsules;

         o   an agreement with Knoll Pharmaceutical Company for the marketing of
             our Thyrogen-Registered Trademark- hormone in the U.S.;

         o   an agreement with Biogen, Inc. for the marketing of
             AVONEX-Registered Trademark- (Interferon-beta 1a), Biogen's
             treatment for relapsing forms of multiple sclerosis, in Japan
             following regulatory approval;

         o   a joint venture with BioMarin Pharmaceutical Inc. for the
             development and commercialization of Aldurazyme-TM- enzyme for the
             treatment of the lysosomal storage disorder known as
             mucopolysaccharidosis I;

         o   a joint venture with Genzyme Transgenics Corporation for the
             development and commercialization of transgenic antithrombin III, a
             human protein that Genzyme Transgenics produces in the milk of
             genetically modified animals;

         o   a joint venture with Pharming Group N.V. for the development and
             commercialization of human alpha-glucosidase for the treatment of
             Pompe disease;

         o   an agreement with Genovo Inc. for the development of gene therapy
             products for the treatment of lysosomal storage disorders;

         o   a relationship with Mount Sinai Medical Center for the development
             of a therapy for the treatment of Niemann-Pick disease;

         o   a joint venture with Diacrin, Inc. to develop and commercialize
             products and processes using porcine fetal cells for the treatment
             of Parkinson's disease and Huntington's disease; and

         o   an agreement with Dyax Corp. to develop and commercialize the
             protein EPI-KAL2 for the treatment of chronic inflammatory
             diseases.

         Genzyme General plans to enter into additional collaborations in the
future. The success of these arrangements are largely dependent on the efforts
and skills of Genzyme General's collaborators. Genzyme General cannot guarantee
that:

         o   these agreements will not be terminated;

         o   its strategic collaborators will devote significant resources to
             the collaborations; or

         o   any of these collaborations will result in the successful
             development or commercialization of any products.

OUR OPTION TO PURCHASE LIMITED PARTNERSHIP INTERESTS COULD DILUTE THE RIGHTS OF
HOLDERS OF GENZ STOCK.

         We organized Genzyme Development Partners, L.P. ,a special purpose
research and development entity, in 1989 and transferred to it technology and
commercial rights to our hyaluronic acid-based products designed to prevent the
occurrence and severity of post-operative adhesions. These products, which we
refer to as the Sepra


                                       11



products, are now allocated to Genzyme Surgical Products. We have an option to
purchase the limited partnership interests in the partnership. If we exercise
this option, we may have to issue shares of GENZ Stock or make substantial cash
payments or both. If we make payments in GENZ Stock, the rights of holders of
GENZ Stock could be diluted and the market price of that stock may fall. If we
make cash payments, our cash resources would diminish.

                   RISKS RELATED TO GENZYME MOLECULAR ONCOLOGY

         The following risks and uncertainties may adversely affect the business
of Genzyme Molecular Oncology.

GENZYME MOLECULAR ONCOLOGY MAY NEVER BE ABLE TO SUCCESSFULLY DEVELOP OR
COMMERCIALIZE ANY OF ITS CANCER THERAPIES.

         Genzyme Molecular Oncology does not have any cancer therapies on the
market and its only therapies in clinical development are its melanoma and
breast cancer vaccines. Before commercializing any cancer therapies, Genzyme
Molecular Oncology will need to conduct substantial research and development,
including, in some cases, the replication of preclinical studies performed by
its collaborators, undertake preclinical and clinical testing and obtain
regulatory approvals. This process involves a high degree of uncertainty and may
take several years. Its product development efforts may fail for many reasons,
including:

         o   the product fails in preclinical studies;

         o   clinical trials may not support the safety or effectiveness of the
             product; or

         o   we fail to obtain the required regulatory approvals.

         We cannot guarantee that Genzyme Molecular Oncology will successfully
develop any particular product or that any product it successfully develops will
gain market acceptance.

GENZYME MOLECULAR ONCOLOGY ANTICIPATES FUTURE LOSSES AND MAY NEVER BECOME
PROFITABLE.

         Genzyme Molecular Oncology has not generated significant revenues to
date and does not expect to do so for several years. As of December 31, 1999,
Genzyme Molecular Oncology had an accumulated deficit of approximately $69.0
million. It expects to have significant operating losses for the next several
years. Genzyme Molecular Oncology plans to spend substantial amounts of money
on, among other things:

         o   research and development;

         o   preclinical and clinical testing; and

         o   pursuing regulatory approvals.

         We cannot guarantee that the efforts underlying these expenditures will
be successful or that Genzyme Molecular Oncology's operations will ever be
profitable.

IF GENZYME MOLECULAR ONCOLOGY FAILS TO OBTAIN THE CAPITAL NECESSARY TO FUND ITS
OPERATIONS, IT WILL BE UNABLE TO FUND DEVELOPMENT PROGRAMS AND COMPLETE CLINICAL
TRIALS.

         We anticipate that Genzyme Molecular Oncology's current cash resources,
together with amounts available under a line of credit from Genzyme General and
revenues generated from our SAGE-TM- technology and license agreements, will be
sufficient to fund its operations through 2000. Genzyme Molecular Oncology's
cash needs may differ from those planned, however, because of many factors,
including the:

         o   results of research and development and clinical testing;


                                       12



         o   achievement of milestones under existing strategic collaborations;

         o   ability to establish and maintain additional strategic
             collaborations and licensing arrangements;

         o   costs of protecting our intellectual property rights;

         o   development of competing products and services; and

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

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

GENZYME MOLECULAR ONCOLOGY MAY NOT RECEIVE SIGNIFICANT PAYMENTS FROM
COLLABORATORS DUE TO UNSUCCESSFUL RESULTS IN EXISTING COLLABORATIONS OR A
FAILURE TO ENTER INTO FUTURE COLLABORATIONS.

         Genzyme Molecular Oncology's strategy to develop and commercialize some
of its products and services includes entering into various arrangements with
academic and corporate collaborators and licensees. It depends on the success of
these parties in performing research, preclinical and clinical testing and
marketing. These arrangements may require Genzyme Molecular Oncology to transfer
important rights to its corporate collaborators and licensees. These
collaborators and licensees could choose not to devote resources to these
arrangements or, under certain circumstances, may terminate them early. In
addition, these collaborators and licensees, outside of their arrangements with
Genzyme Molecular Oncology, may develop technologies or products that are
competitive with those that Genzyme Molecular Oncology is developing. As a
result, we cannot guarantee that Genzyme Molecular Oncology will receive
revenues from these relationships or that any of its strategic collaborations
will continue or not terminate early. In addition, we cannot guarantee that
Genzyme Molecular Oncology will be able to enter into collaborations in the
future.

GENZYME MOLECULAR ONCOLOGY MAY BE REQUIRED TO LICENSE TECHNOLOGY FROM
COMPETITORS IN ORDER TO DEVELOP AND COMMERCIALIZE SOME OF ITS PRODUCTS AND
SERVICES, AND IT IS UNCERTAIN WHETHER THESE LICENSES WILL BE AVAILABLE.

         Third party patent rights and pending patent applications filed by
third parties, if issued, may cover some of the products Genzyme Molecular
Oncology is developing or testing. As a result, Genzyme Molecular Oncology may
be required to obtain licenses from the holders of these patents in order to use
or sell certain products and services. We cannot guarantee that these licenses
will be made available on acceptable terms or at all. If these licenses are not
available, Genzyme Molecular Oncology's ability to commercialize its products
and services may be impaired.

         In its cancer vaccine program, Genzyme Molecular Oncology in the
process of evaluating the therapeutic administration of peptide products and
genes that encode specific tumor antigens, including MART-1 and gp100. Genzyme
Molecular Oncology is aware of two issued U.S. patents directed to the gene that
encodes MART-1. While it has obtained rights under one of these patents, Genzyme
Molecular Oncology is still in the process of evaluating the scope and validity
of the other to determine whether it needs to obtain a license. Genzyme
Molecular Oncology is also evaluating an issued U.S. patent covering the gene
that encodes gp100 and three published Patent Cooperation Treaty applications by
three different applicants that may cover antigens derived from gp100. Genzyme
Molecular Oncology is in the process of evaluating the scope and validity of
these patents and patent applications to determine whether it needs to obtain
licenses.

GENZYME MOLECULAR ONCOLOGY MAY INCUR SUBSTANTIAL COSTS AS A RESULT OF LITIGATION
OR OTHER PROCEEDINGS RELATING TO PATENT AND OTHER INTELLECTUAL PROPERTY RIGHTS.

         If Genzyme Molecular Oncology or one of its strategic collaborators
initiate litigation to enforce Genzyme Molecular Oncology's patent or license
rights, or are required to defend these rights in response to third party
claims, its business or financial position may be negatively affected. Genzyme
Molecular Oncology has licensed its p53 gene


                                       13



therapy rights to Schering-Plough. These patent rights are the subject of an
interference proceeding in the U.S. and an opposition proceeding in Europe.
Adverse determinations in these proceedings may negatively affect Genzyme
Molecular Oncology's ability to receive future milestones and product royalties
under its agreement with Schering-Plough.

ADVERSE EVENTS IN THE FIELD OF GENE THERAPY MAY NEGATIVELY AFFECT REGULATORY
APPROVAL OR PUBLIC PERCEPTION OF GENZYME MOLECULAR ONCOLOGY'S GENE THERAPY
PRODUCTS.

         The recent death of a patient undergoing gene therapy using an
adenoviral vector to deliver a therapeutic gene has been widely publicized. This
death and any other adverse events in the field of gene therapy that may occur
in the future may result in greater governmental regulation and potential
regulatory delays relating to the testing or approval of Genzyme Molecular
Oncology's gene therapy products. As a result of this death, the U.S. Senate has
commenced hearings to determine whether additional legislation is required to
protect volunteers and patients who participate in gene therapy clinical trials.
Additionally, the Recombinant DNA Advisory Committee, which acts as an advisory
body to the National Institutes of Health (NIH), has extensively discussed the
use of adenoviral vectors in gene therapy clinical trials and recently issued a
draft report on the safety of adenoviral vectors. While this draft report
recommends that clinical trials using adenoviral vectors should continue with
caution, it also suggested a number of changes in the way gene therapy clinical
trials are conducted. If any new guidelines are adopted by the NIH, Genzyme
Molecular Oncology's gene therapy clinical trials could be delayed or become
more expensive to conduct.

         Genzyme Molecular Oncology has reported to the FDA and the NIH that
there have been three deaths in its Phase I/II melanoma cancer vaccine trial at
Massachusetts General Hospital. The principal investigator for this trial
indicated that each of these deaths was due to disease progression and not
related to the patient's treatment. Deaths are not unexpected in a clinical
trial treating patients with advanced stage melanoma because these patients have
short life expectancies. Genzyme Molecular Oncology cannot, however, rule out
the possibility that its cancer vaccines may be a contributing cause of death
for patients in the future.

         The commercial success of any gene therapy products that Genzyme
Molecular Oncology develops will depend in part on public acceptance of the use
of gene therapies for the prevention or treatment of human diseases. Public
attitudes may be influenced by claims that gene therapy is unsafe, and gene
therapy may not gain the acceptance of the public or the medical community.
Negative public reaction to gene therapy could result in greater government
regulation and stricter clinical trial oversight and commercial product labeling
requirements of gene therapies and could cause a decrease in the demand for any
gene therapy product that Genzyme Molecular Oncology may develop.

                   RISKS RELATED TO GENZYME SURGICAL PRODUCTS

         The following risks and uncertainties may adversely affect the business
of Genzyme Surgical Products.

GENZYME SURGICAL PRODUCTS ANTICIPATES FUTURE LOSSES AND MAY NEVER BECOME
PROFITABLE.

         Genzyme Surgical Products expects to have significant operating losses
for the next several years. It plans to spend substantial amounts of money on,
among other things:

         o   conducting research and development activities;

         o   pursuing regulatory approvals;

         o   conducting commercialization activities; and

         o   providing surgeon education and training.

         We cannot guarantee that the efforts underlying these expenditures will
be successful or that Genzyme Surgical Products' operations will ever be
profitable. It may be years before the division generates any revenue from sales
of products currently under development.


                                       14



IF GENZYME SURGICAL PRODUCTS FAILS TO OBTAIN CAPITAL NECESSARY TO FUND ITS
OPERATIONS, IT WILL BE UNABLE TO FUND DEVELOPMENT PROGRAMS AND COMPLETE CLINICAL
TRIALS.

         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:

         o   the ability to become profitable;

         o   the results of research and development efforts;

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

         o   the achievement of milestones under strategic collaborations;

         o   the ability to establish and maintain additional distribution
             arrangements;

         o   the enforcement of patent and other intellectual property rights;

         o   market acceptance of novel approaches and therapies;

         o   the development of competitive products; and

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

         Genzyme Surgical Products may require significant additional financing
to continue operations at anticipated levels. We cannot guarantee that it will
be able to obtain any additional financing or find it on favorable terms. If
Genzyme Surgical Products has insufficient funds or is unable to raise
additional funds, it may have to delay, reduce or eliminate some of its
programs. Genzyme Surgical Products may also have to give third parties rights
to commercialize technologies or products that it would otherwise have sought to
commercialize itself.

IF GENZYME SURGICAL PRODUCTS EXERCISES AN OPTION TO PURCHASE INTERESTS IN
GENZYME DEVELOPMENT PARTNERS, ITS CASH RESOURCES MAY DIMINISH AND THE RIGHTS OF
ITS STOCKHOLDERS MAY BE DILUTED.

         In 1989, we organized Genzyme Development Partners, L.P., a special
purpose research and development entity, and transferred to it technology and
commercial rights to the Sepra products. We have an option to purchase the
limited partnership interests in the partnership under certain circumstances for
approximately $26 million plus continuing royalties based on certain sales of
the Sepra products. We have allocated the purchase option to Genzyme Surgical
Products. The option's exercise price is payable in cash, shares of GENZ Stock
or a combination of the two, as determined by Genzyme Surgical Products when it
exercises the option.

         If Genzyme Surgical Products exercises this option, it will have to
make substantial cash payments or compensate Genzyme General with shares of GZSP
Stock for the GENZ Stock used, or both. If the division makes cash payments, its
cash resources would diminish. If it makes the payment in whole or in part in
shares of GENZ Stock, then our board of directors would need to approve the
issuance of GENZ Stock in return for Genzyme General receiving a number of GZSP
designated shares with a fair market value equal to the fair market value of the
shares of GENZ Stock. Those GZSP designated shares would be shares of GZSP Stock
that our board would have the option to issue from time to time with all
proceeds allocable to Genzyme General. Beginning on June 30, 2000, and on every
June 30th thereafter, we will have to distribute substantially all the GZSP
designated shares if the number of those shares exceeds 10% of the number of
shares of GZSP Stock then outstanding.

         We cannot guarantee that our board would authorize the issuance of
shares of GENZ Stock for payment of the option exercise price and the creation
of any GZSP designated shares. If our board creates and subsequently


                                       15



distributes or otherwise disposes of any GZSP designated shares, this would
substantially dilute the rights of the holders of GZSP Stock and could
significantly affect the market price of GZSP Stock.

         If Genzyme Surgical Products does not exercise the option, the
partnership would have the right to sell or otherwise transfer to a third party
a license to background technology that we granted to it. A sale or transfer of
this technology may terminate our joint venture with the partnership to
manufacture and sell the Sepra products in the U.S. and Canada. In addition,
failure to exercise the option would cause the joint venture to become
terminable upon 90 days' prior notice by either Genzyme or Genzyme Development
Partners.

GENZYME SURGICAL PRODUCTS IS DEVOTING SIGNIFICANT RESOURCES TO DEVELOPING NOVEL
ALTERNATIVE PRODUCTS AND TREATMENTS THAT MAY NOT BE COMMERCIALLY SUCCESSFUL.

         Genzyme Surgical Products is devoting a significant amount of money to
developing products that will represent alternatives to traditional surgical
procedures or treatments. These products will likely require several years of
aggressive and costly marketing before they might become widely accepted by the
surgical community. Genzyme Surgical Products is developing products that are
designed to enable surgeons to perform minimally invasive cardiovascular
surgery. The medical conditions that can be treated with minimally invasive
cardiovascular surgery are currently being treated with widely accepted surgical
procedures such as coronary artery bypass grafting and catheter-based
treatments, including balloon angioplasty, atherectomy and coronary stenting. To
date, minimally invasive cardiovascular surgery has been performed on a limited
basis and its further adoption by the surgical community will partly depend on
Genzyme Surgical Products' ability to educate cardiothoracic surgeons about its
effectiveness and to facilitate the training of cardiothoracic surgeons in
minimally invasive cardiovascular surgery techniques.

         Similarly, until recently surgeons have not used products designed to
reduce the incidence and extent of postoperative adhesions. Since 1996, when
Sepra Film-Registered Trademark- bioresorbable membrane was introduced, market
acceptance of anti-adhesion products has been slow. To increase sales of the
Sepra products, Genzyme Surgical Products has had to educate surgeons and
hospital administrators about the problems of, and costs associated with,
adhesions and the benefit of preventing adhesions. It has also had to train
surgeons on the proper handling and use of these products.

         We cannot guarantee that Genzyme Surgical Products' efforts in
educating and training the surgical community will result in the widespread
adoption of minimally invasive cardiovascular surgery and anti-adhesion products
or that surgeons adopting these procedures and products will use Genzyme
Surgical Products' products.

ADVERSE EVENTS IN THE FIELD OF GENE THERAPY MAY NEGATIVELY AFFECT REGULATORY
APPROVAL OR PUBLIC PERCEPTION OF GENZYME SURGICAL PRODUCTS' GENE THERAPY
PRODUCTS.

         The recent death of a patient undergoing gene therapy using an
adenoviral vector to deliver a therapeutic gene has been widely publicized. This
death and any other adverse events in the field of gene therapy that may occur
in the future may result in greater governmental regulation and potential
regulatory delays relating to the testing or approval of Genzyme Surgical
Products' gene therapy products. As a result of this death, the U.S. Senate has
commenced hearings to determine whether additional legislation is required to
protect volunteers and patients who participate in gene therapy clinical trials.
Additionally, the Recombinant DNA Advisory Committee, which acts as an advisory
body to the National Institutes of Health (NIH), has extensively discussed the
use of adenoviral vectors in gene therapy clinical trials and recently issued a
draft report on the safety of adenoviral vectors. While this draft report
recommends that clinical trials using adenoviral vectors should continue with
caution, it also suggested a number of changes in the way gene therapy clinical
trials are conducted. If any new guidelines are adopted by the NIH, Genzyme
Surgical Products' gene therapy clinical trials could be delayed or become more
expensive to conduct.


                                       16



         The commercial success of any gene therapy products that Genzyme
Surgical Products develops will depend in part on public acceptance of the use
of gene therapies for the prevention or treatment of human diseases. Public
attitudes may be influenced by claims that gene therapy is unsafe, and gene
therapy may not gain the acceptance of the public or the medical community.
Negative public reaction to gene therapy could result in greater government
regulation and stricter clinical trial oversight and commercial product labeling
requirements of gene therapies and could cause a decrease in the demand for any
gene therapy product that Genzyme Surgical Products may develop.

COMPETITION FROM OTHER MEDICAL DEVICE AND TECHNOLOGY COMPANIES COULD HURT
GENZYME SURGICAL PRODUCTS' PERFORMANCE.

         The human health care products and services industry is extremely
competitive. Major medical device and technology companies compete or may
compete with Genzyme Surgical Products. These include such companies as:

         o   Atrium Medical Corporation and Sherwood-Davis & Geck, a division of
             Tyco International, Ltd. in the cardiovascular chest drainage and
             fluid management market;

         o   The Ethicon division of Johnson & Johnson Ltd. and U.S. Surgical
             Corporation, a division of Tyco in the cardiovascular closure
             market;

         o   CardioThoracic Systems, Inc., Medtronic, Inc., U.S. Surgical,
             Guidant Corporation, Baxter Healthcare Corporation and Ethicon in
             the minimally invasive cardiovascular surgery market;

         o   Ethicon, Lifecore Biomedical, Inc., Life Medical Sciences, Inc. and
             Gliatech, Inc. in the anti-adhesion market; and

         o   Karl Storz Endoscopy America, Inc., Scanlan International, Inc.,
             Pilling Weck Surgical Instruments and the Codman division of
             Johnson & Johnson Ltd. in the reusable instruments market.

         These competitors may have superior research and development, marketing
and production capabilities. Some competitors also may have greater financial
resources than Genzyme Surgical Products. The division is likely to incur
significant costs developing and marketing new products without any guarantee
that it will be commercially successful. The future success of Genzyme Surgical
Products will depend on its ability to effectively develop and market its
products against those of its competitors.

THE TREND TOWARD CONSOLIDATION IN THE SURGICAL DEVICES INDUSTRY MAY ADVERSELY
AFFECT GENZYME SURGICAL PRODUCTS' ABILITY TO MARKET SUCCESSFULLY ITS PRODUCTS TO
SOME SIGNIFICANT PURCHASERS.

         The current trend among hospitals and other significant consumers of
surgical devices is to combine into larger purchasing groups to increase their
purchasing power and thus reduce their purchase price for surgical devices.
Partly in response to this development, surgical device manufacturers have been
consolidating to be able to offer a more comprehensive product line to these
larger purchasing groups. In order to successfully market its products to larger
purchasing groups, Genzyme Surgical Products may have to expand its product
lines or enter into joint marketing or distribution agreements with other
manufacturers of surgical devices. We cannot guarantee that it will be able to
employ either of these initiatives or that, when employed, these initiatives
will increase the marketability of its products.

GENZYME SURGICAL PRODUCTS MAY NOT RECEIVE SIGNIFICANT PAYMENTS FROM
COLLABORATORS DUE TO UNSUCCESSFUL RESULTS IN EXISTING COLLABORATIONS OR A
FAILURE TO ENTER INTO FUTURE COLLABORATIONS.

         Genzyme Surgical Products' strategy to develop and commercialize some
of its products and services includes entering into various arrangements with
academic and corporate collaborators and licensees. It depends on the success of
these parties in performing research, preclinical and clinical testing and
marketing. These arrangements may require Genzyme Surgical Products to transfer
important rights to its corporate collaborators and licensees. These
collaborators and licensees could choose not to devote resources to these
arrangements or, under certain circumstances, may


                                       17



terminate them early. In addition, these collaborators and licensees, outside of
their arrangements with Genzyme Surgical Products, may develop technologies or
products that are competitive with those that Genzyme Surgical Products is
developing. As a result, we cannot guarantee that Genzyme Surgical Products will
receive revenues from these relationships or that any of its strategic
collaborations will continue or not terminate early. In addition, we cannot
guarantee that Genzyme Surgical Products will be able to enter into
collaborations in the future.

                     RISKS RELATED TO GENZYME TISSUE REPAIR

         The following risks and uncertainties may adversely affect the business
of Genzyme Tissue Repair.

THE COMMERCIAL SUCCESS OF GENZYME TISSUE REPAIR'S LEAD PRODUCT,
CARTICEL-Registered Trademark- CHONDROCYTES, IS UNCERTAIN.

         Carticel-Registered Trademark- chondrocytes are used to treat knee
cartilage damage. This service involves a proprietary process for growing
autologous (a patient's own) cartilage cells to replace those that are damaged
or lost. Revenues from Carticel-Registered Trademark- chondrocytes accounted for
approximately 75% of Genzyme Tissue Repair's 1999 revenue. The commercial
success of Carticel-Registered Trademark- chondrocytes will depend on many
factors including:

         o   POSITIVE RESULTS FROM POST-MARKETING STUDIES.

             We have agreed with the FDA to conduct two post-marketing studies
             to confirm the effectiveness of Carticel-Registered Trademark-
             chondrocytes. The first study compares clinical outcomes of
             patients in Genzyme Tissue Repair's registry who did not respond
             to treatment before being implanted with Carticel-Registered
             Trademark- chondrocytes. This study will measure outcomes before
             and after implantation with Carticel-Registered Trademark-
             chondrocytes. The second study compares the long-term clinical
             effects of treatment with Carticel-Registered Trademark-
             chondrocytes to other available treatments. If these studies
             demonstrate that treatment with Carticel-Registered Trademark-
             chondrocytes is not superior to the alternatives studied, the FDA
             may suspend or withdraw its approval of Carticel-Registered
             Trademark- chondrocytes. If Genzyme Tissue Repair cannot market
             Carticel-Registered Trademark- chondrocytes in the U.S., its
             financial results will be negatively impacted.

         o   FDA APPROVAL OF RELATED DEVICE.

             Genzyme Tissue Repair has developed a device to improve the
             procedure for implanting Carticel-Registered Trademark-
             chondrocytes and plans to file for marketing approval with the
             FDA. Genzyme Tissue Repair believes it will begin marketing this
             device in 2000. We cannot guarantee that the FDA will approve
             this device, that this device will improve the procedure for
             implanting Carticel-Registered Trademark- chondrocytes, or that
             this device will gain commercial acceptance.

         o   THE AVAILABILITY OF THIRD PARTY REIMBURSEMENT.

             Since the FDA approved Carticel-Registered Trademark-
             chondrocytes, we have seen a substantial increase in the number
             of third party payers who cover it. Some third party payers,
             however, do not cover Carticel-Registered Trademark-
             chondrocytes. We cannot guarantee that any third party payers
             will continue to cover it or that additional third party payers
             will begin to provide reimbursement.

             Although FDA approval is a crucial factor in insurance plans
             deciding to cover new treatments, a number of major insurance
             plans also base such decisions on their own or third party
             evaluations of such treatments. One independent association that
             conducts such evaluations is the Blue Cross Blue Shield
             Association. The Blue Cross Blue Shield Association has
             determined that its Technology Assessment Committee does not
             believe that Carticel-Registered Trademark- chondrocytes meets
             all of its published criteria for new treatments. We believe that
             Carticel-Registered Trademark- chondrocytes does in fact meet all
             of such criteria and are discussing the evaluation with the Blue
             Cross Blue Shield Association. While individual Blue Cross Blue
             Shield plans representing more than 50% of Blue Cross Blue Shield
             policyholders have provided policy coverage for
             Carticel-Registered Trademark- chondrocytes without a favorable
             evaluation by the Blue Cross Blue Shield Association, many Blue
             Cross Blue Shield plans have delayed approving
             Carticel-Registered Trademark- chondrocytes from coverage under
             their policies as a direct result of this unfavorable ruling.
             Since


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             these remaining plans represent a significant percentage of
             insured lives in the U.S., this ruling has delayed our access to
             a substantial portion of the market for Carticel-Registered
             Trademark- chondrocytes.

         o   THE SUCCESS OF COMPETITIVE PRODUCTS.

             The process we use to grow a patient's cartilage cells is not
             patentable, and we do not yet have significant patent protection
             covering the other processes used in providing
             Carticel-Registered Trademark- chondrocytes. Consequently, we
             cannot prevent a competitor from developing the ability to grow
             cartilage cells and from offering a product or service that is
             similar or superior to Carticel-Registered Trademark-
             chondrocytes. If a competitor were to develop such ability and
             obtain FDA approval for a competitive product or service, Genzyme
             Tissue Repair's financial results of operations would be
             negatively impacted. We are aware of at least two other companies
             that are growing autologous cartilage cells for cartilage repair
             in the European market. Also, several pharmaceutical and
             biotechnology companies are developing alternative treatments for
             knee cartilage damage. One or more of these companies may develop
             products or services superior to the Carticel-Registered
             Trademark- chondrocytes.

         o   MARKET ACCEPTANCE BY ORTHOPEDIC SURGEONS.

             We are marketing Carticel-Registered Trademark- chondrocytes to
             orthopedic surgeons. We cannot guarantee that we will train
             enough surgeons who incorporate it into their practice to make it
             commercially successful.

GENZYME TISSUE REPAIR ANTICIPATES FUTURE LOSSES AND MAY NEVER BECOME PROFITABLE.

         We expect Genzyme Tissue Repair to have significant operating losses at
least through 2000 as it continues to commercialize Carticel-Registered
Trademark- chondrocytes and to conduct research and development and clinical
programs. We cannot guarantee that Genzyme Tissue Repair's operations will ever
be profitable.

IF GENZYME TISSUE REPAIR FAILS TO OBTAIN CAPITAL NECESSARY TO FUND ITS
OPERATIONS, IT WILL BE UNABLE TO FUND DEVELOPMENT PROGRAMS AND COMPLETE CLINICAL
TRIALS.

         We anticipate that Genzyme Tissue Repair's current cash resources,
together with amounts available under an equity line of credit from Genzyme
General, will be sufficient to fund Genzyme Tissue Repair's operations through
the end of 2000.

         In 1999, Genzyme Tissue Repair received $25 million in cash from
Genzyme General in connection with the transfer to Genzyme General of our
interest in our joint venture with Diacrin, Inc. If the joint venture does
not initiate a Phase III clinical trial of NeuroCell-TM--PD by June 30, 2000,
Genzyme Tissue Repair will be required to pay Genzyme General $20 million
plus accrued interest at 13.5%. Genzyme Tissue Repair may repay this amount
in cash, GZTR designated shares, or combination of both, at its option. GZTR
designated shares are shares of GZTR Stock that are not issued and
outstanding, but which our board may issue, sell or distribute without
allocating the proceeds to Genzyme Tissue Repair. If these milestones are not
achieved, and Genzyme Tissue Repair elects to repay Genzyme General in cash,
its cash reserves will be substantially diminished or depleted in their
entirety. If Genzyme Tissue Repair elects to repay Genzyme General in shares
of GZTR designated shares, this would substantially dilute the rights of the
holders of GZTR Stock and could significantly affect the market price of GZTR
Stock.

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

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

         o   results of research and development and clinical testing;

         o   enforcement of patent and other intellectual property rights; and


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         o   development of competitive products and services.

         Genzyme Tissue Repair will require substantial additional funds in
order to continue operations at current levels beyond 2000. We cannot guarantee
that Genzyme Tissue Repair will be able to obtain any additional financing 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, scale back 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.

GENZYME TISSUE REPAIR'S RESULTS FLUCTUATE QUARTERLY AND THIS COULD HAVE AN
ADVERSE EFFECT ON ITS OPERATIONS.

         We expect that the revenues from the sale of the Carticel-Registered
Trademark- chondrocytes will fluctuate based on Genzyme Tissue Repair's success
in penetrating the market, the availability of competitive procedures and the
availability of third party reimbursement. We cannot predict the timing or
magnitude of these fluctuations. Furthermore, we expect that revenues from
Carticel-Registered Trademark- chondrocytes will be lower in the summer months
because fewer operations are typically performed during those months.

         We also expect that revenues from the sale of Epicel-TM- skin grafts
will continue to fluctuate from quarter to quarter. This fluctuation is a result
of several unpredictable factors, including the number and survival rate of
severe burn patients who are treated with Epicel-TM- skin grafts.

         Since Genzyme Tissue Repair must maintain extensive tissue culture
facilities and a trained staff for both Carticel-Registered Trademark-
chondrocytes and Epicel-TM-skin grafts, a significant portion of its costs are
fixed and, therefore, fluctuations in demand can have an adverse effect on its
results of operations.

GENZYME TISSUE REPAIR RELIES ON KEY COLLABORATORS TO SUPPORT FURTHER RESEARCH
AND DEVELOPMENT OF CARTICEL-Registered Trademark- CHONDROCYTES AND THESE EFFORTS
COULD SUFFER IF IT EXPERIENCES PROBLEMS WITH THESE COLLABORATORS.

         Carticel-Registered Trademark- chondrocytes were developed based on
the work of a group of Swedish physicians. Genzyme Tissue Repair had consulting
agreements with the two leaders of that group. These agreements, however,
expired in 1998 and Genzyme Tissue Repair is currently negotiating renewals of
these agreements. Pending these negotiations, these physicians are continuing to
advise Genzyme Tissue Repair on the commercialization and further development
Carticel-Registered Trademark- chondrocytes.

         We cannot guarantee that the two physicians will sign a new consulting
agreement or continue to advise Genzyme Tissue Repair.

         In addition, individuals who are familiar with the know-how underlying
Carticel-Registered Trademark- chondrocytes through their association with these
physicians may disclose such information to our competitors. Either event could
have an adverse effect on Genzyme Tissue Repair's results of operations.

         We have entered into a sponsored research agreement with the University
of Gothenburg in Sweden and certain physicians, including the two physicians
discussed above. The purpose of the agreement is to conduct additional research
on Carticel-Registered Trademark- chondrocytes. The agreement prohibits each
member of the research team from disclosing any information relating to Genzyme
Tissue Repair or its business that they acquire in connection with their work
under the agreement. The agreement also states that all inventions that the
members conceive or reduce to practice during the course of the research program
will be Genzyme Tissue Repair's property, with royalties payable to the
inventing member. We cannot guarantee that these members will honor their
obligations under the sponsored research agreement.


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