The primary objective is to prospectively study the comparative effectiveness and comparative safety of approved therapies for RA in a Japanese cohort of patients treated by rheumatologists. Specifically the effectiveness and safety of newer classes and dosages of disease modifying anti-rheumatic drugs (DMARDs); e.g. higher dose methotrexate (MTX), non-tumor necrosis factor (TNF) biologics, and Janus Kinase (JAK) inhibitors) will be compared with anti-TNF biologics.