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). The gene discussed is ATAD3A; the disease is breast cancer.