Molecular subtypes of breast cancer include luminal A (ER + , PR + , -HER2), luminal B (ER + or PR + , + HER2), HER2 enriched (ER- or PR-, + HER2) and triple negative breast cancer (ER- or PR-, -HER2) [5, 6]. Here, ERBB2 is linked to triple-negative breast carcinoma.