Despite the excellent anti-cancer activity, the atezolizumab-based chimeric antigen receptor (CAR) T cells showed a robust off-target effect. Overall, gPD-L1 CAR-T exhibits excellent anti-tumor activity against TNBCs, and it could be a promising immunotherapy tool to treat TNBCs in clinic. Furthermore, targeting glycosylation moiety on the tumor antigen is a novel approach to lessen CAR-T toxicity in patients.