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Extracts of Tripterygium wilfordii Hook F (TwHF), a traditional Chinese herbal medicine, have been widely used for treating rheumatoid arthritis (RA) in combination with methotrexate (MTX) in China for several decades. However, the efficacy and safety of MTX plus TwHF treatment remain unclear.

A comprehensive search of databases in both Chinese and English was performed. Data from the selected studies were extracted and analyzed independently by two authors.

Six randomized controlled trials were included in the final analysis with a total of 643 patients. All trials added TwHF (in the form of Tripterygium glycosides) to the MTX-based therapy. For efficacy, the addition of TwHF increased 50% responder rates (RR) (RR 1.337, 95% confidence interval [CI]: 1.188–1.505, P < 0.001), and it reduced swollen and tender joint counts, shortened the duration of morning stiffness …