ERBB2 and breast cancer: In our recent paper [2], we analysed a total of 505 BC subjects (229 Luminal A, 120 Luminal B, 58 HER2-enriched, and 98 Basal-like) and we identified a total of 108 switch genes (S1 Table) that were specific for the most aggressive BC subtype, i.e. the basal-like subtype [5–7].