A Randomised, Double Blind Study to Evaluate the Safety and Efficacy of the p38 Kinase Inhibitor, GW856553, in Subjects With Neuropathic Pain From Peripheral Nerve Injury

This study will be a double-blind, placebo-controlled, parallel group study. After enrolment and initial assessments, subjects will receive oral GW856553 7.5 milligram (mg) twice daily (BID) or matching placebo for 28 days in a 1:1 ratio. Sufficient numbers of subjects will be recruited to obtain 142 evaluable subjects. This is a double-blind, randomized, placebo-controlled, parallel group study. Subjects will undertake a screening period which may last up to approximately 3 weeks, followed by a baseline period of 1 week, a randomized treatment period of 4 weeks and a follow-up period of approximately 2 weeks. This is a multi-centre, double-blind, randomized, placebo-controlled study in subjects who have at least moderate intensity of neuropathic pain resulting from peripheral nerve injury due to trauma or surgery. It will investigate the efficacy, safety and tolerability of GW856553 over 28 days of treatment. Approximately 158 subjects will be randomized to ensure 142 evaluable subjects. Randomization ratio will be 1:1 for placebo or GW856553 respectively. The dose of GW856553 will be 7.5 mg BID.