Accordingly, presence or lack of endogenous NKG2D expression in breast cancer lines, such as the epithelial MCF-7 (NKG2D+) or mesenchymal SUM149PT (NKG2D–), is unaligned with their mainly epithelial versus mesenchymal representations [3], [9], [14], [15]. Here, KLRK1 is linked to breast cancer.