Of note is that, despite the fact that RP02 has a weaker binding affinity to purified CD38, the RP02 CAR‐T cells were more potent than RP03 and 028 CAR‐T cells in terms of cytotoxicity for all tumor cell lines tested, including Daudi, RPMI8226, Raji, and THP cells (Figure 5a). Here, CD38 is linked to neoplasm.