Immunohistochemical (IHC) staining analysis (Fig. 7A) revealed a negative correlation between MUC1 and ATAD3A not only in all breast cancer patients (Figs. 7B, C) but also in four subtypes of breast cancer patients—luminal A, luminal B, HER2 and TNBC (Fig. S7). This evidence concerns the gene ERBB2 and breast carcinoma.