INVESTORS & MEDIA

News Release

November 10, 2009 at 4:35 PM EST

Regeneron Announces Conference Call to Discuss Expanded Antibody Collaboration with Sanofi-aventis

TARRYTOWN, N.Y., Nov 10, 2009 /PRNewswire-FirstCall via COMTEX News Network/ -- Regeneron Pharmaceuticals, Inc. (Nasdaq: REGN) will host a conference call and live webcast at 8:30 a.m. Eastern Time on Wednesday, November 11 to discuss the company's expanded strategic antibody collaboration with sanofi-aventis, which was announced today.

    Conference call and webcast details are as follows:
         Live conference call: (913) 312-0714
         Conference call archive: (719) 457-0820
         Code for live and archived conference call is 7813143

For the live and archived webcast, please visit the Investor Relations page on the Regeneron website at www.regeneron.com. The webcast will be archived for 90 days and the telephone replay for 7 days.

About Regeneron Pharmaceuticals

Regeneron is a fully integrated biopharmaceutical company that discovers, develops, and commercializes medicines for the treatment of serious medical conditions. In addition to ARCALYST(R) (rilonacept) Injection for Subcutaneous Use, its first commercialized product, Regeneron has therapeutic candidates in clinical trials for the potential treatment of cancer, eye diseases, inflammatory diseases, and pain, and has preclinical programs in other diseases and disorders. Additional information about Regeneron and recent news releases are available on Regeneron's web site at www.regeneron.com.

This news release discusses historical information and includes forward-looking statements about Regeneron and its products, development programs, finances, and business, all of which involve a number of risks and uncertainties, such as risks associated with preclinical and clinical development of Regeneron's drug candidates, determinations by regulatory and administrative governmental authorities which may delay or restrict Regeneron's ability to continue to develop or commercialize its product and drug candidates, competing drugs that are 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 collaboration agreement, including Regeneron's agreements with the sanofi-aventis Group and Bayer HealthCare, to be canceled or to terminate without any product success, risks associated with third party intellectual property, and other material risks. 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 (SEC), including its Form 10-K for the year ended December 31, 2008 and Form 10-Q for the quarter ended September 30, 2009. 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.

    Contact Information:

    Peter Dworkin                     Laura Lindsay
    Investor Relations                Media Relations
    914.345.7640                      914.345.7800
    peter.dworkin@regeneron.com       laura.lindsay@regeneron.com

SOURCE Regeneron Pharmaceuticals, Inc.

http://www.regeneron.com

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