A study was conducted to assess the effectiveness and safety of intravenous abatacept in Japanese children aged 4-17 with active polyarticular-course juvenile idiopathic arthritis (pJIA) who had previously received inadequate treatment.
In a phase III trial involving 20 patients, the primary outcome showed a 90% response rate (JIA-ACR30) after 16 weeks of treatment, with significant improvements in other response rates over time.
By Week 52, high levels of efficacy were maintained, with notable improvements in disease activity and function as measured by various clinical endpoints.