ERBB2 and neoplasm: In addition to the assignment to clinical subgroups based on ER, PR and HER2 status, 142 tumour samples were also assigned to the five intrinsic molecular subtypes (basal-like, luminal A, luminal B, HER2 and normal-like) using the expression of predefined intrinsic gene lists according to the PAM50 centroid-based classification method [1,10].