Tofacitinib could induce Hepatitis B virus (HBV) reactivation in RA patients.With previous studies having already demonstrated that RA patients using biologic agents, might experience HBV reactivation leading to acute hepatitis, hyperbilirubinemia, and death, Wang, et al. aimed to investigate HBV reactivation in patients with RA receiving tofacitinib. They found that Hepatitis B surface antigen positive patients receiving tofacitinib have a high incidence rate of HBV reactivation, which could be...