The results show that Anti-MICB-CAR-NK had the strongest killing ability on PANC-1 and BxPC-3 cells with the highest MICB expression, the smallest inhibition on A549 cells with the MICB expression, and the growth inhibition rate of tumor cells Anti-MICB-CAR-NK with significant MICB expression dependence (Figure 2D). This evidence concerns the gene MICB and neoplasm.