INVESTORS & MEDIA

TARRYTOWN, N.Y., May 8, 2012 /PRNewswire/ -- Regeneron Pharmaceuticals, Inc. (NASDAQ: REGN) today announced that the Arthritis Advisory Committee of the U.S. Food and Drug Administration (FDA) voted against approval of ARCALYST® (rilonacept) Injection for Subcutaneous Use for the proposed indication for the prevention of gout flares in patients initiating uric acid-lowering therapy.  The Committee's recommendation will be considered by the FDA in its review of the supplemental Biologics License Application (sBLA) for ARCALYST, but the Committee's recommendation is not binding on the FDA.  Regeneron submitted an sBLA for marketing approval of ARCALYST in the United States and has been granted a target date for an FDA decision of July 30, 2012.

Important information about ARCALYST® (rilonacept) Injection
ARCALYST is currently indicated in the U.S. for the treatment of Cryopyrin-Associated Periodic Syndromes (CAPS), including Familial Cold Auto-inflammatory Syndrome (FCAS) and Muckle-Wells Syndrome (MWS) in adults and children 12 and older.  Rilonacept is also approved, but not marketed, in the E.U. for the same patient population.  ARCALYST is not approved, but is currently under review by the U.S. FDA, for the prevention of gout flares in patients initiating uric acid-lowering therapy.

IL-1 blockade may interfere with immune response to infections.  Serious, life-threatening infections have been reported in patients taking rilonacept.  Rilonacept should be discontinued if a patient develops a serious infection.  Taking rilonacept with tumor necrosis factor inhibitors is not recommended because this may increase the risk of serious infections.  Treatment with rilonacept should not be initiated in patients with active or chronic infections.  Patients should not receive a live vaccine while taking rilonacept.  It is recommended that patients receive all recommended vaccinations prior to initiation of treatment with rilonacept.  Patients should be monitored for changes in their lipid profiles and provided with medical treatment if warranted.  Hypersensitivity reactions associated with rilonacept administration have been rare.  Please see the full Prescribing Information for ARCALYST® (rilonacept), available online at www.regeneron.com/ARCALYST-fpi.pdf.

About Regeneron Pharmaceuticals
Regeneron is a fully integrated biopharmaceutical company that discovers, invents, develops, manufactures, and commercializes medicines for the treatment of serious medical conditions.  Regeneron markets two products in the United States, ARCALYST® (rilonacept) Injection for Subcutaneous Use and EYLEA® (aflibercept) Injection, and has filed regulatory applications with the U.S. Food and Drug Administration (FDA) for second indications for each of these products.  A regulatory application has also been submitted to the FDA for the product candidate ZALTRAP® (aflibercept) Concentrate for Intravenous Infusion.  Phase 3 studies are in progress with EYLEA® in a third indication, and with product candidate sarilumab.  Earlier-stage clinical programs are underway with nine additional monoclonal antibodies.  Regeneron has active research and development programs in many disease areas, including ophthalmology, inflammation, cancer, and hypercholesterolemia.  Additional information and recent news releases are available on the Regeneron web site at www.regeneron.com.

Regeneron Forward-Looking Statements  
This news release includes forward-looking statements that involve risks and uncertainties relating to future events and the future 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, unforeseen safety issues resulting from the administration of products and product candidates in patients, the likelihood and timing of possible regulatory approval and commercial launch of Regeneron's late-stage product candidates and new indications for marketed products including ARCALYST®, determinations by regulatory and administrative governmental authorities which may delay or restrict Regeneron's ability to continue to develop or commercialize Regeneron's products and drug candidates, competing drugs that may be superior to Regeneron's products and drug candidates, uncertainty of market acceptance of Regeneron's product and drug candidates, unanticipated expenses,  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, 2011 and Form 10-Q for the quarter ended March 31, 2012.  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.

SOURCE Regeneron Pharmaceuticals, Inc.