RecruitingPhase 4Drug trialEfficacy and Safety for Rituximab Combined With Telitacicept in the Treatment of ANCA-associated Vasculitis (TTCAAVREM)This study is a prospective, open-labelled, randomized, controlled, single-center clinical trial. The aim of this study is to investigate the remission rate of patients treated with Telitacicept combined with Rituximab in remission-induction and Telitacicept alone in remission-maintain treatment.