Comparison of clinical practices during the transitional and young adult phases between patients with oligoarticular/polyarticular juvenile idiopathic arthritis and those with rheumatoid arthritis in Japan

Despite an overlap in age, patients with JIA and RA exhibit distinct disease characteristics and therapeutic patterns. These differences underscore the need to expand approved treatment options for JIA, promote equitable access to biologics, and strengthen transitional care frameworks. Further research is warranted to explore long-term outcomes, reproductive health considerations, and socioeconomic barriers that influence treatment continuity in young adults with childhood-onset arthritis.