The importance of distinguishing apocrine differentiation is underscored by its potentially favorable prognosis in comparison to other TNBC subtypes.27, ‐29 In the 50 apocrine carcinomas included in this cohort, 92% demonstrated an AR positive, K5 negative or focal, SOX10 negative immunophenotype. This evidence concerns the gene KRT5 and apocrine adenocarcinoma.