The negative correlation between the Sdc1 expression in the tumor epithelium and the PR expression was significant in the ductal carcinomas (P = 0.014), as the positive correlation between the Sdc1 expression in the tumor stroma and the histological grade was in the lobular carcinomas (P = 0.014) (Table 4). The gene discussed is SDC1; the disease is breast ductal adenocarcinoma.