This is a multi-centered, randomized, double-blind, placebo-controlled, ascending parallel-group study of the safety and tolerability of REGN88 in patients with rheumatoid arthritis who are receiving concomitant methotrexate.
This study will be conducted in 3 parts, and will include a total of 6 dose cohorts. Part B will not begin until the safety of Part A has been assessed. Part C will not begin until enrollment in Part B is complete.
