A Multicenter, Randomized, Double-Blind, Placebo-Controlled Study of the Human Anti-TNF Monoclonal Antibody Adalimumab in Rheumatoid Arthritis Patients Currently Receiving Treatment With Methotrexate

The purpose of the study was to assess the safety, immunogenicity, and clinical efficacy of adalimumab compared with placebo (during double-blind phase) and to to evaluate the long-term safety and maintenance of efficacy following repeated administration of adalimumab (during open-label extension phase) in patients with persistently active rheumatoid arthritis who were receiving concurrent methotrexate therapy.