According to previous studies, around 40% of BRCA1-related breast cancers belong to ductal carcinoma, not otherwise specified (ductal NOS) type, while typical medullary carcinoma (MC) feature can be observed in 7.8% to 13% of BRCA1-associated breast carcinomas 12-14. This evidence concerns the gene BRCA1 and breast ductal adenocarcinoma.