BECN1 and breast neoplasm: Basal-like breast tumors were seen in 31.0% of patients who had low BECN1 but high BRCA1 expression but in only 4.3% of patients who had high BECN1 but low BRCA1 expression (P = 3.39E − 24 for the difference between groups) (Supplementary Fig. 1E).