HSP70-2 expression was also observed in breast cancer cell lines with different receptor status: BT-474 and SK-BR-3 (HER2-positive), MCF-7 (ER-positive), and MDA-MB-231 (triple negative breast cancer), but not human normal mammary epithelial HNMEC cells [110]. The gene discussed is ERBB2; the disease is breast carcinoma.