A Prospective, One-arm and Open Clinical Study of Obinutuzumab in the Treatment of Pediatric Primary Immune Thrombocytopenia (ITP)

"intravenous Obinutuzumab administration~This study adopts a prospective, single arm, open design method. 60 subjects were enrolled in the study and were treated with CD20 monoclonal antibody (Obinutuzumab: 1000mg) for once.~The first stage is the main research stage (d1-w12), which is the core treatment period. The subjects will receive intravenous infusion of 1000mg Obinutuzumab for once to observe the safety and efficacy during treatment.~The second stage (w12-w48) is the stage of withdrawal from the visit, mainly to observe the safety and continuous efficacy of Obinutuzumab after treatment."