In this study, our hypothesis was that the location of triple-negative breast cancers may have a tendency to be located in the posterior or medial region of the breast, since some of the tumors seen in high risk patients or patients with BRCA-1 gene previously reported posterior position and triple-negative breast cancers have been reported to have less axillary lymph node metastasis but poorer prognosis due to distant metastasis compared with ER-positive cancers. The gene discussed is BRCA1; the disease is triple-negative breast carcinoma.