Efficacy and safety of abatacept for systemic juvenile idiopathic arthritis: A systematic review.

Objectives: This systematic review assessed the efficacy and safety of abatacept in patients with systemic juvenile idiopathic arthritis (JIA).

Methods: Studies published between 2000 and 2021 were searched using PubMed, Embase, Cochrane, Ichushi-Web, and clinical trial registries. The risk of bias was assessed according to the manual for development clinical practice guidelines by Minds, a project to promote evidence-based medicine in Japan.

Results: Seven observational studies were included. American College of Rheumatology pediatric 30/50/70 responses at 3, 6, and 12 months were 64.8%/50.3%/27.9%, 85.7%/71.4%/42.9%, and 80.0%/50.0%/40.0%, respectively. Outcomes on systemic symptoms, joint symptoms, and activities of daily living were not obtained. No macrophage activation syndrome or infusion reaction occurred. Serious infection occurred in 2.6% of cases.

Conclusions: Abatacept improved the disease activity index. In addition, abatacept was as safe as interleukin-6 (IL-6) and IL-1 inhibitors. However, both the efficacy and safety data in this systematic review should be reviewed with caution because their quality of evidence is low or very low. Further studies are needed to confirm the efficacy and safety of abatacept for systemic JIA, especially its efficacy on joint symptoms.