TNF and rheumatoid arthritis: Until the end of patient enrollment of this study, a total of six bDMARDs have been approved for use in RA in China, including the interleukin-6 receptor inhibitor, tocilizumab, and five TNF inhibitors (infliximab, adalimumab, and etanercept, including Enbrel® and local brand Yi Sai Pu® and Qiangke®).