NCR1 and cancer: The lysis of cancer cells is triggered by low expression of ligands for NK cell inhibitory receptors, such as NKG2A, killer cell Ig-like receptors, and CD244 (Lanier, 2015; Muntasell et al., 2017), in combination with high expression of NK cell-activating receptors, such as NKG2D, NKp30, NKp46, and natural cytotoxicity receptors (Pahl and Cerwenka, 2017).