It is worth noting that we observed significant cytotoxic effects of both CD19-NK-92 and CD138-NK-92 cells at the relatively low E : T ratio of 1 : 5 at 4 h postincubation, while previous reports on the efficacy of first- and second-generation CAR-NK-92 cells targeting CD19 or CD138 in similar hematologic cancer cell lines, albeit with different experimental settings, generally evaluated CAR-NK-92 effects at the E : T ratio ranging from 1 : 4 at 6–24 h postincubation to 5 : 1 at 4 h postincubation (Supplementary Table S1). Here, CD19 is linked to hematopoietic and lymphoid cell neoplasm.