In order to investigate if chemotherapeutic treatment is associated with alterations in ABCA7, MCF-7, BT-474, SK-BR3, and MDA-MB-231, representing luminal A, luminal B, Her2-positive, and triple-negative breast cancer, respectively, were treated for 72 h at IC50 with Dox (MCF-7: 704.3 nM, BT-474: 514.9 nM, SK-BR3: 643.3 nM, MDA-MB-231: 645.8 nM) or Tax (MCF-7: 1.9 nM, BT-474: 1.9 nM, SK-BR3: 4.9 nM, MDA-MB-231: 56.5 nM). The gene discussed is ERBB2; the disease is triple-negative breast carcinoma.