BCL2L1 and neoplasm: IHC images showed increased accumulation of CAR-T cells expressing Bcl-xL, and flow cytometry analysis presented that the frequency of MFG-anti-CEA CAR+Bcl-xL transduced T cells was significantly higher than that of MFG-anti-CEA CAR transduced T cells in tumor-infiltrating lymphocytes (TILs), further indicating improved persistence of CAR-T cells by overexpressed exogenous Bcl-xL.