A Randomized, Double-Blind, Parallel Group, International Study to Evaluate the Safety and Efficacy of Ocrelizumab in Combination With Methotrexate (MTX) Compared to MTX Alone in Methotrexate- Naive Patients With Active Rheumatoid Arthritis

This study will evaluate the efficacy and safety of ocrelizumab, compared with placebo, in combination with methotrexate in patients with active rheumatoid arthritis who are naive to methotrexate. Patients will be randomized to receive placebo, ocrelizumab 200mg i.v. or ocrelizumab 500mg i.v. on Days 1 and 15. Repeat courses of i.v. treatment will be administered at weeks 24, 52 and 76. All patients will receive concomitant methotrexate (7.5 mg escalating to 20mg p.o. weekly). The anticipated time on study treatment is 2+ years, and the target sample size is 500+ individuals.