However, even if the NK-activating ligand, CD72, whose corresponding receptor (SEMA4D) is expressed by NK-92 cells (Supplementary Fig. 5B) might play a role in inducing breast cancer sensitivity to NK-mediated cytotoxicity (a hypothesis that needs to be tested), the role of CD56 in this same mentioned process is independent of the expression CD72. Here, CD72 is linked to breast cancer.