Efficacy and Safety Study of CC-292 Versus Placebo as Co-therapy With Methotrexate in Active Rheumatoid Arthritis

This is a Phase 2a, multicenter, randomized, double-blind, placebo-controlled, proof-of-concept study to determine the efficacy and safety of CC-292 (375 mg PO daily) on a stable background of MTX therapy in female subjects with active RA. Approximately 80 female subjects with active RA will be randomized 1:1 into two dose groups: active CC-292 (375 mg PO daily) or identically-appearing placebo capsules for 4 weeks