Phase 3 Trial Of ZALTRAP⿢ (aflibercept) In Advanced Prostate Cancer To Continue As Planned At Recommendation Of Independent Data Monitoring Committee

About Regeneron Pharmaceuticals, Inc.

Regeneron is a fully integrated biopharmaceutical company that discovers, develops, and commercializes medicines for the treatment of serious medical conditions.  In addition to ARCALYST® (rilonacept) Injection for Subcutaneous Use, its first commercialized product, Regeneron has therapeutic candidates in Phase 3 clinical trials for the potential treatment of gout, diseases of the eye (wet age-related macular degeneration, central retinal vein occlusion, and diabetic macular edema), and certain cancers.  Additional therapeutic candidates developed from proprietary Regeneron technologies for creating fully human monoclonal antibodies are in earlier stage development programs in rheumatoid arthritis and other inflammatory conditions, pain, cholesterol reduction, allergic and immune conditions, and cancer.  Additional information about Regeneron and recent news releases are available on Regeneron's web site at www.regeneron.com.

Forward Looking Statements

This news release includes forward-looking statements that involve risks and uncertainties relating to future events and the future financial performance of Regeneron, and actual events or results may differ materially from these forward-looking statements.  These statements concern, and these risks and uncertainties include, among others, the nature, timing, and possible success and therapeutic applications of Regeneron's product candidates and research and clinical programs now underway or planned, the likelihood and timing of possible regulatory approval and commercial launch of Regeneron's late-stage product candidates, determinations by regulatory and administrative governmental authorities which may delay or restrict Regeneron's ability to continue to develop or commercialize Regeneron'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.

Contacts:

Michael Aberman, M.D.Investor RelationsTel: 1 [phone] [e-mail]

Peter DworkinMedia RelationsTel: 1 [phone] [e-mail]

(1) Aflibercept in combination with docetaxel in metastatic androgen independent prostate cancer ( VENICE). Available at: http://www.clinicaltrials.gov/ct2/show/NCT00519285?term=venice&rank=2

(2) International Agency for Research on Cancer. Globocan 2008.  Prostate cancer incidence and mortality worldwide 2008; summary.  Available at: http://globocan.iarc.fr/factsheets/cancers/prostate.asp.

(3) International Agency for Research on Cancer. Globocan 2008.  Fast stats-  EU. Available at:   http://globocan.iarc.fr/factsheets/populations/factsheet.asp?uno=990

(4) American Cancer Society. Cancer Facts and Figures 2011.

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