ERBB2 and breast cancer: We further performed western blotting (WB) to screen a panel of 11 breast cancer cell lines, including basal-like (BT-549, MDA-MB-231, MDA-MB-468, and BT-20), luminal A (MCF7, T-47D, and ZR-75-1), luminal B (BT-474), and HER2 + (KPL4, SKBR3, and MDA-MB-453) to measure the levels of CM hRNase 1 (Fig. 1i).