While the HER2-enriched subtype illustrates the tumours that have a high expression of the HER2 gene and other genes related to its pathway [36], the TNBC subtype, often referred to as basal-like tumours, mimics the expression profile of the myoepithelial cells and usually lacks the expression of both hormonal receptors (HR) and HER2. Here, ERBB2 is linked to neoplasm.