A Phase II Randomized, Double-Blind, Placebo-Controlled Safety and Efficacy Study of Lenalidomide in Lumbar Radicular Pain with a Long-Term Open-Label Extension Phase.

Objective: This phase II study assessed lenalidomide efficacy and safety.

Design: Three-phase core study: 14-day prerandomization, 12-week treatment, and 52-week open-label extension.

Setting: Fourteen US centers from July 2005 to July 2007.