Jan 15, 2008 - XenoPort, Inc. (Nasdaq:XNPT) and GlaxoSmithKline (NYSE:GSK) announced positive top-line results from a placebo-controlled Phase 3 clinical trial designed to evaluate the potential of XP13512 (GSK1838262) to maintain efficacy over the course of nine months in patients with moderate-to-severe primary Restless Legs Syndrome, or RLS... XenoPort's Press Release - GlaxoSmithKline 's Press Release-