Repligen Reports Third Quarter Fiscal Year 2009 Financi...(clinical trial in which approximately 15...)

Date:2/5/2009

clinical trial in which approximately 150 patients with bipolar depression will receive either RG2417 or a placebo twice a day for eight weeks. This study is designed to assess the safety and efficacy of RG2417 on the symptoms of depression as measured by the Montgomery-Asberg Depression Rating Scale (MADRS) and the Clinical Global Impression of Change in Bipolar Disorder scale (CGI-BP-C). This study is based on the positive results of a Phase 2a study in which 83 patients received either RG2417 or a placebo twice a day for six weeks. Over the six-week treatment period, the study demonstrated a statistically significant improvement in the symptoms of depression in the patients receiving RG2417 when compared to placebo on the MADRS (p=0.01) and the CGI-BP-C (p=0.04).

RG2833 for Friedreich's Ataxia and Huntington's Disease

We are currently developing inhibitors of histone deacetylases (HDACs) which may have utility in treating progressive, inherited neurodegenerative diseases such as Friedreich's ataxia and Huntington's disease. We have identified several potential clinical candidates and are further characterizing these leads in animal models for their pharmacologic, toxicologic and pharmacodynamic profiles.

Stock Repurchase Program

In June 2008, Repligen announced that its Board of Directors authorized the repurchase of up to 1.25 million shares of its common stock. As of December 31, 2008, the Company has repurchased approximately 493,000 shares for an aggregate cost of approximately $2.0 million.

Quarterly Conference Call

Repligen will host a conference call and webcast on Thursday, February 5th at 10:00 a.m. EST, to review financial results. This call can be accessed via Repligen's website at www.repligen.com or by calling (866) 383-8008 for domestic calls and (617) 597-5341 for internation
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