KRT88P and rheumatoid arthritis: This meta-analysis included 0 clinical trials and 11 observational studies involving a total of 347 patients (25 HBsAg+; 322 HBsAg−/anti-HBc+) with rheumatoid arthritis who were treated with TCZ [3,17,18,19,20,21,22,23,24,25,35].