Most BBC tumors also lack expression of HER2 and thus this subtype largely overlaps with the clinically defined ‘triple-negative’ breast cancer (TNBC), which is also characterized by the lack of ER, PR, and HER2 expression (Rakha et al., 2008; Foulkes et al., 2010). The gene discussed is ERBB2; the disease is triple-negative breast carcinoma.