RecruitingPhase 4Drug trialEfficacy and Safety for Telitacicept in the Remission Maintenance Treatment of ANCA-associated Vasculitis (TTCAZAREM)This study is a prospective, open-labelled, randomized, controlled, single-center clinical trial. The aim of this study is to compare the remission rate of patients treated with Telitacicept combined with azathioprine and azathioprine alone in remission-maintenance treatment of AAV.