This study aimed to investigate in detail the efficacy of switching from etanercept reference product (RP) to etanercept biosimilar in patients with rheumatoid arthritis (RA) under real-world clinical conditions using clinical indices and musculoskeletal ultrasound (MSUS). This interventional, multicenter, open-label, single-arm clinical trial involved 24- or 52-week follow-up. This study enrolled patients with RA who had been treated with etanercept-RP for ≥ 24 weeks, achieved clinical low disease activity (LDA) or remission, and switched from etanercept-RP to etanercept biosimilar.
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