Date:7/12/2011

neron's product and drug candidates, competing drugs that may be superior to Regeneron's product and drug candidates, uncertainty of market acceptance of Regeneron's product and drug candidates, unanticipated expenses, the availability and cost of capital, the costs of developing, producing, and selling products, the potential for any license or collaboration agreement, including Regeneron's agreements with the Sanofi Group and Bayer HealthCare, to be canceled or terminated without any product success, and risks associated with third party intellectual property and pending or future litigation relating thereto.  A more complete description of these and other material risks can be found in Regeneron's filings with the United States Securities and Exchange Commission, including its Form 10-K for the year ended December 31, 2010 and Form 10-Q for the quarter ended March 31, 2011.  Regeneron does not undertake any obligation to update publicly any forward-looking statement, whether as a result of new information, future events, or otherwise, unless required by law.ContactsSanofi:Global Product Communications Corporate Media RelationsIngrid Gorg-Armbrecht

Marisol PeronTel: +33 (0) 1 53 77 46 25

Tel: +33 (0) 1 53 77 45 02Mobile: + 33(0) 6 38 10 50 87

Mobile: +33 (0) 6 08 18 94 78E-mail:ingrid.goerg-armbrecht@sanofi.com

E-mail: marisol.peron@sanofi.comRegeneron:Investor Relations Media RelationsMichael Aberman, M.D.

Peter DworkinTel: 1 (914) 345-7799

Tel: 1 (914) 345-7640michael.aberman@regeneron.com

peter.dworkin@regeneron.com
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SOURCE Regeneron Pharmaceuticals, Inc. Copyright©2010 PR Newswire. All rights reserved

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