NCR3 and colorectal carcinoma: In addition, colorectal carcinoma-derived cancer-initiating cells (CICs) were more susceptible to freshly purified allogeneic NK cells than the non-CIC counterpart of the tumors, due to the higher expression of ligands for NKp30 and NKp44 in the natural cytotoxicity receptor group of activating NK receptors in CICs (40).