DCIS.com belongs to the ER−/PR−/HER2− and basal-like DCIS subtype as compared with MCF-7 cells (ER+/PR+ subtype), SK-BR-3 cells (HER2 subtype) and MDA-MB-231 cells (ER−/PR−/HER2− subtype) (Additional file 1: Figure S1). The gene discussed is ERBB2; the disease is ductal breast carcinoma in situ.