CD7 and neoplasm: To test the tumor-killing efficacy of CD5/CD7 bispecific CARs and single-target CARs, and further reveal the differences between Tan CAR and dual CAR, CD5 CAR BBz, CD7 CAR BBz, Tan5-7 CAR BBz, Tan7-5 CAR BBz, and Dual CAR BBz were constructed (Fig. 2a).