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Transcept Pharmaceuticals Announces That A Phase 2 Clinical Trial Of TO-2061 As Adjunctive Therapy For Obsessive Compulsive Disorder Did Not Meet Primary Endpoint

POINT RICHMOND, Calif., Dec. 21, 2012 /PRNewswire/ -- Transcept Pharmaceuticals, Inc. (Nasdaq: TSPT) today announced initial top-line results from its Phase 2 clinical trial evaluating the efficacy and safety of TO-2061 (ondansetron oral tablets 0.5 mg and 0.75 mg) in patients with obsessive compulsive disorder (OCD) who had not adequately responded to treatment with approved first-line therapies. The data from the trial showed that TO-2061 did not meet the primary efficacy endpoint to demonstrate an improvement in OCD symptoms versus placebo.

Transcept expects to complete the remaining protocol-specified analyses in early 2013 and will make a determination on any future development of TO-2061 after further review of the data.

"It is disappointing that the Phase 2 trial of TO-2061 did not meet its primary endpoint, in particular for those patients suffering from treatment resistant OCD," said Glenn Oclassen, President and Chief Executive Officer of Transcept. "Once we have reviewed the full data set, we will determine next steps, if any, in the clinical development program for TO-2061 for the adjunctive treatment of OCD."

About the Study Design

The Phase 2 study was a double-blind, placebo-controlled trial to evaluate the safety and efficacy of TO-2061 in 168 OCD patients who had not adequately responded to an approved OCD medication. Patients with a documented history of at least 6 weeks of inadequate response to an approved OCD medication continued to receive that first line OCD medication during an additional 6-week run-in phase of the study. Those patients who failed to respond during the run-in phase were eligible to be randomized to the 12-week double-blind active treatment phase, during which they continued to receive their first line medication with the addition of ondansetron 0.5 mg twice per day, ondansetron 0.75 mg twice per day or placebo twice per day. The primary endpoint of the study was the difference between active and placebo treatment arms in the change from baseline as measured by the Yale-Brown Obsessive Compulsive Scale (Y-BOCS). The Y-BOCS is a ten-item clinician-administered scale used to assess the severity of obsessions and compulsions, independent of the number and type of obsessions or compulsions present.

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