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Arena Pharmaceuticals Initiates Phase 1 Clinical Trial of APD334 for Autoimmune Diseases
Date:4/5/2013

SAN DIEGO, April 5, 2013 /PRNewswire/ -- Arena Pharmaceuticals, Inc. (NASDAQ: ARNA) announced today the initiation of dosing in a Phase 1 clinical trial of APD334, a novel oral drug candidate that targets the sphingosine 1-phosphate subtype 1 (S1P1) receptor for the potential treatment of autoimmune diseases.

This randomized, double-blind and placebo-controlled Phase 1 trial will evaluate the safety, tolerability and pharmacokinetics of single-ascending doses of APD334 in up to 64 healthy adult volunteers.

"We are pleased to expand our clinical-stage pipeline by initiating a Phase 1 trial of APD334, and look forward to advancing this novel compound through our validated development platform," said William R. Shanahan , M.D., Arena's Senior Vice President and Chief Medical Officer. "APD334's selectivity for the S1P1 receptor has the potential to improve upon the adverse event profile of currently available treatments for a spectrum of autoimmune diseases."

About Autoimmune DiseasesAutoimmune diseases are characterized by an inappropriate immune response against substances and tissues that are normally present in the body. In an autoimmune reaction, a person's antibodies and immune cells target healthy tissues, triggering an inflammatory response. Reducing the immune and/or inflammatory response is an important goal in the treatment of autoimmune disease.

About APD334APD334 is an orally available drug candidate discovered by Arena that targets the S1P1 receptor for the potential treatment of a number of conditions related to autoimmune diseases, including multiple sclerosis, psoriasis and rheumatoid arthritis. S1P1 receptors have been demonstrated to be involved in the modulation of several biological responses, including lymphocyte trafficking from lymph nodes to the peripheral blood. By isolating lymphocytes in lymph nodes, fewer immune cells are available in the circulating blood to effect tissue damage. Arena has optimized APD334 as a potent and selective small molecule S1P1 receptor agonist that reduces the severity of disease in preclinical autoimmune disease models.

About Arena PharmaceuticalsArena is a biopharmaceutical company focused on discovering, developing and commercializing novel drugs that target G protein-coupled receptors, or GPCRs, to address unmet medical needs. BELVIQ® (lorcaserin HCl), Arena's internally discovered drug, was approved by the US Food and Drug Administration in June 2012 and is under review for regulatory approval in additional territories. Arena's US operations are located in San Diego, California, and its operations outside of the United States, including its commercial manufacturing facility, are located in Zofingen, Switzerland. For more information, visit Arena's website at www.arenapharm.com.

Arena Pharmaceuticals® and Arena® are registered service marks of Arena Pharmaceuticals, Inc. BELVIQ® is a registered trademark of Arena Pharmaceuticals GmbH.

Forward-Looking StatementsCertain statements in this press release are forward-looking statements that involve a number of risks and uncertainties. Such forward-looking statements include statements about the advancement, therapeutic indication and use, safety, efficacy, tolerability, selectivity and mechanism of action of APD334; the protocol, design, scope, enrollment and other aspects of the Phase 1 clinical trial of APD334; the potential of APD334 and treatment of autoimmune diseases in general; the regulatory review of BELVIQ; and Arena's focus, plans, goals, strategy, expectations, research and development programs, and ability to discover and develop compounds and commercialize drugs. For such statements, Arena claims the protection of the Private Securities Litigation Reform Act of 1995. Actual events or results may differ materially from Arena's expectations. Factors that could cause actual results to differ materially from the forward-looking statements include, but are not limited to, the following: APD334 may not have an adequate safety margin or otherwise be sufficient for further development or regulatory review or approval; risks related to commercializing drugs, including regulatory, manufacturing and supply issues and the pace of market acceptance; cash and revenues generated from BELVIQ, including the impact of competition; Arena's revenues will be based in part on management's estimates, judgment and accounting policies, and incorrect estimates or disagreement regarding Arena's estimates or accounting policies may result in changes to Arena's guidance or previously reported results; the timing and outcome of regulatory review is uncertain, and BELVIQ may not be approved for marketing when expected or ever by any other regulatory agency; government and commercial reimbursement and pricing decisions; risks related to relying on collaborative arrangements; the timing and receipt of payments and fees, if any, from collaborators; the entry into or modification or termination of collaborative arrangements; unexpected or unfavorable new data; nonclinical and clinical data is voluminous and detailed, and regulatory agencies may interpret or weigh the importance of data differently and reach different conclusions than Arena or others, request additional information, have additional recommendations or change their guidance or requirements before or after approval; data and other information related to any of Arena's research and development may not meet safety, efficacy or other regulatory requirements or otherwise be sufficient for further research and development, regulatory review or approval or continued marketing; Arena's ability to obtain and defend patents; the timing, success and cost of Arena's research and development programs; results of clinical trials and other studies are subject to different interpretations and may not be predictive of future results; clinical trials and other studies may not proceed at the time or in the manner expected or at all; having adequate funds; and satisfactory resolution of litigation or other disagreements with others. Additional factors that could cause actual results to differ materially from those stated or implied by Arena's forward-looking statements are disclosed in Arena's filings with the Securities and Exchange Commission. These forward-looking statements represent Arena's judgment as of the time of this release. Arena disclaims any intent or obligation to update these forward-looking statements, other than as may be required under applicable law.Contact: Arena Pharmaceuticals, Inc.

Media Contact: Russo PartnersCindy McGee, Vice President,

David Schull, PresidentInvestor Relations & Alliance Management

david.schull@russopartnersllc.com cmcgee@arenapharm.com

858.717.2310858.453.7200, ext. 1479 www.arenapharm.com  
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SOURCE Arena Pharmaceuticals, Inc.
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