Although our case presented with a component of poor differentiated carcinoma without any component of breast ductal carcinoma, other evidence supports the diagnosis of BCCF: an immunohistochemical profile of GCDFP-15 (+), CK7 (+), CK20 (-), CK (+), CK5(-), EMA (+), 32-year-old female with regular menstruation and no history of reproductive system tumors,and no pregnancy during disease occurrence. The gene discussed is KRT5; the disease is breast ductal adenocarcinoma.