This study is a multicenter prospective observational study to show non-inferiority of clinical efficacy for small molecular inhibitors after 48 week of treatment to biologic disease modifying anti-rheumatic drugs (bDMARDs) in patients having moderately to severely active RA and who have been intolerant to conventional synthetic disease modifying anti-rheumatic drugs (csDMARDs) including methotrexate.~Primary end point is a percentage of participants of achieving low disease activity according to Disease Activity Score in 28 joints-Erythrocyte Sedientation Rate (DAS28-ESR) at weeks 24. A total of 506 RA patients will be included, and allocated in ratio of 1:1 to bDMARD group and small molecule inhibitor group. Group allocation is determined by shared-decision making, so that the number of participants could be re-assessed according to recruitment status of participatns.
The objective of a multicenter prospective observational study is to compare effectiveness and safety of biologic disease-modifying antirheumatic drugs and small molecular inhibitors in patients with moderately to severely active rheumatoid arthritis patients who have had an inadequate response or intolerace to methotrexate.