The breast cancer molecular subtypes studied here spanned luminal A (n = 10, 20%), luminal B (HER2-) (n = 10, 20%), luminal B (HER2+) (n = 10, 20%), HER2-enriched (n = 10, 20%) and triple-negative (n = 10, 20%). The gene discussed is ERBB2; the disease is breast carcinoma.