A Phase 3, Multicenter, Randomized, Double-Blind, Placebo-Controlled Study to Evaluate the Efficacy and Safety of LY2127399 in Patients With Moderate to Severe Rheumatoid Arthritis (RA) Who Had an Inadequate Response to Methotrexate Therapy (FLEX M)

The primary purpose of this study is to help answer if LY2127399 is safe and effective in the treatment of rheumatoid arthritis while on a background treatment of methotrexate. This study is comprised of 3 periods: Period 1: 52-week blinded treatment Period 2: additional 48-week unblinded treatment Period 3: 48-week post-treatment follow-up