ERBB2 and triple-negative breast carcinoma: We chose the triple-negative breast cancer cell line MDA-MB-231 known to express very low levels of HER2/neu (Figure 7D), and the HER2-overexpressing cell line BT-474 to compare the effects of the target expression on ADCC levels induced by NK cells from the same donors (Figure 7D, Donors 4 and 5).