The transcriptomic profile of BC patients was stratified into BC subtypes according to the well-established Immunohistochemistry (IHC) (Luminal A, Luminal B, Her2 positive and Triple-negative) and genetic (PAM50; Luminal A, Luminal B, Her2 positive and Basal-like) classification, to identify switch genes shared among four subtypes and those specific for each subtype. Here, ERBB2 is linked to breast cancer.