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XenoPort Reports Positive Top-Line Phase 3 Trial Results of XP13512,in Restless Legs Syndrome

>Additional XP13512 Phase 3 Clinical Trials in RLS

XenoPort is conducting two additional Phase 3 clinical trials, including a second 12-week, double-blind, placebo-controlled Phase 3 clinical trial with the same co-primary and similar secondary endpoints as the trial for which results were announced today. In addition to 1200 mg of XP13512, this trial is also evaluating 600 mg of XP13512. The trial is expected to enroll approximately 300 RLS patients.

XenoPort is also conducting a Phase 3 clinical trial assessing the long-term efficacy of XP13512 using a placebo-controlled, "randomized withdrawal" design to evaluate relapse of RLS symptoms in XP13512-treated or placebo-treated patients who had previously achieved clinical improvement while taking 1200 mg of XP13512 for 24 weeks.

About XP13512 Collaborations

In December 2005, XenoPort licensed to Astellas Pharma Inc. rights to develop and commercialize XP13512 in Japan, Korea, the Philippines, Indonesia, Thailand and Taiwan. In February 2007, XenoPort entered into a collaboration with GlaxoSmithKline (GSK) for the development and commercialization of XP13512 in all countries of the world, excluding the Astellas territory.

XenoPort has received up-front and milestone payments totaling $110 million from these collaborations. It is eligible to receive additional potential milestone payments of up to $615 million, including a $5 million milestone payment from Astellas for the completion of the Phase 3 clinical trial for which results were announced today.

Results of XP13512 in Restless Legs Syndrome

XenoPort is entitled to receive royalties on any product sales under both collaborations and has an option to share profits and co-promote XP13512 with GSK in the United States. The GSK agreement provides that XenoPort will complete its Phase 3 clinical development program of XP13512 for the treatment of RLS and that GSK will file the NDA in the U.S. for this indication. GSK is
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