CD19 and Thrombocytopenia: Thrombocytopenia occurred in 20 patients (40.0%) in the CD19 CART group and 15 patients (75.0%) in the Bi-CART group, with a significant difference (P=0.008); Neutropenia occurred in 40 patients (80.0%) in the CD19 CART group and 17 patients (85.0%) in the Bi-CART group, with no significant difference (P=0.744).