Pfizer terminates Lyrica Phase 3 trial on neuropathic pain associated with HIV neuropathy

Pfizer Inc. (NYSE: PFE) announced today that it has stopped a Phase 3 clinical trial of Lyrica (pregabalin) in patients with neuropathic pain associated with HIV neuropathy, a form of nerve damage characterized by burning pain usually beginning in the feet. The decision follows review of a planned interim analysis of the study by the trial's external Data Monitoring Committee (E-DMC). There were no safety concerns raised in the E-DMC review of the interim data.    

The protocol for study A0081244 - A Randomized, Double-Blind, Placebo-Controlled, Parallel-Group, Multicenter Trial of Pregabalin Versus Placebo in the Treatment of Neuropathic Pain Associated with HIV Neuropathy - called for an interim efficacy analysis when approximately half of the planned 416 subjects had been enrolled. The interim analysis included a total of 246 subjects randomized, and the results revealed that the improvements in neuropathic pain symptoms in this study were virtually identical between the Lyrica and placebo treatments.

The primary endpoint of the study was mean pain score derived from subject's diary for daily average pain on an 11-point pain numeric rating scale. The study also assessed a number of secondary safety and efficacy endpoints.

"The results of this study show the complexities of studying pain, particularly in a difficult-to-treat condition such as neuropathic pain associated with HIV neuropathy for which there are no approved medications in the United States," said Steven J. Romano, M.D., senior vice president, Head, Medicines Development Group, Global Primary Care Business Unit, Pfizer Inc. "The study of Lyrica for this condition is an example of Pfizer's dedication to better understanding neuropathic pain and to providing data and developing treatments to address areas of patient need." Lyrica is not approved in the U.S. for the treatment of neuropathic pain associated with HIV neuropathy.