BSG and neoplasm: The reasons for this could be (1) that the majority of CD147-CAR-NK cells in the tumor-bearing hCD147TG mice penetrate and persist in the tumor more than the non-tumor tissues; (2) the relatively short lifespan of CD147-CAR-NK cells compared to CD147-CAR-T cells in vivo; (3) the different forms of CD147 between tumor and healthy tissues; or (4) the different post-translation modification of CD147 between tumor and healthy tissues, for instance, the levels of glycosylation of CD147 between tumor and healthy tissues.