Taking into account all 21 NK-activating ligands as a whole (Figure 2), we observed that 43%, 66.5%, 66.5% and 52.4% of these ligands correlated with longer RFS in BC patients with tumors of luminal A, luminal B, HER2-positive and basal-like subtypes, respectively (Figure 2A, left graph). This evidence concerns the gene ERBB2 and breast cancer.