In a subgroup analysis of patients who were diploid for BECN1 and BRCA1, in both the TCGA and METABRIC datasets, we also found that low BECN1 mRNA expression but not low BRCA1 mRNA expression was associated with HER2-enriched and basal-like tumor subtypes, TP53 mutations, and grade III tumors (Supplementary Table 5). Here, BECN1 is linked to neoplasm.