( tains forward-looking statementsinclu...)Genzyme Announces Results of Clinical Trial of Hylastan,Health

tains forward-looking statements, including the statements regarding whether and when Synvisc-One obtains marketing approval in the US and the timing of a regulatory filing for Synvisc-One in Europe. These statements are subject to risks and uncertainties that could cause actual results to differ materially from those projected in these forward- looking statements. These risks and uncertainties include, among others, the extent to which the US Food and Drug Administration determines that Synvisc- One can appropriately be approved for marketing in the US, our ability to prepare the necessary regulatory filing for Europe in a timely fashion and the risks and uncertainties described in reports filed by Genzyme with the Securities and Exchange Commission under the Securities Exchange Act of 1934, as amended, including without limitation the information under the heading "Risk Factors" in the Management's Discussion and Analysis of Financial Condition and Results of Operations section of the Genzyme Quarterly Report on Form 10-Q for the quarter ending March 31, 2007. Genzyme cautions investors not to place substantial reliance on the forward-looking statements contained in this press release. These statements speak only as of the date of this press release, and Genzyme undertakes no obligation to update or revise the statements.

Genzyme(R) and Synvisc(R) are registered trademarks and Synvisc-One(TM) is a trademark of Genzyme Corporation. All rights reserved.

Genzyme's press releases and other company information are available at www.genzyme.com and by calling Genzyme's investor information line at 1-800-905-4369 within the United States or 1-678-999-4572 outside the United States.

    Media Contact:    Investor Contact:

    Bo Piela          Sally Curley

    (617) 768-6579    (617) 768-6140

CONTACT: Media, Bo Piela, +1-617-768-6579, or Investor, Sally Curley,+1-617-768-6140, bot
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