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Objective: Triple-negative breast cancer (estrogen receptor-negative, progesterone receptor-negative and Her2-negative) can be classified into two subtypes: basal and non-basal phenotype. And the basal phenotype is associated withpoor outcome. The purpose of this study was to figure out the differences of clinicopathological characters and related factorsof prognosis between these two subtypes. Methods: Immunohistochemical staining was performed for the CK5/6, CK17basal markers and EGFR on biopsy samples from 40 triple-negative patients and the clinicopathology features of thesesamples were investigated. Results: Seventy percent of the patients were diagnosed as the basal phenotype. Comparedwith the non-basal phenotype, the basal phenotype lesions were significantly larger in diameter with a high nuclear grade. Inthe node-negative group the basal phenotype clearly showed the same clinicopathological differences. There was statisticallysignificant concordance among all three antibodies. Conclusion: Expression of basal markers identifies a biologically andclinically distinct subgroup of TN tumors, justifying the use of basal markers to define the basal or the non-basal phenotype. Itis important to help the doctor deciding the therapeutic strategy for patient with triple-negative breast cancer.