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Background: Triple-negative breast cancer(TNBC)is a hypotype of breast cancer that is immunohistochemically based on the negative expression of the hormone receptors estrogen receptor(ER)and progesterone receptor(PR)and on the negative amplification of HER2 amplification.Although the incidence of TNBC only accounts for a small proportion(10-17%)of all breast cancers,most TNBC patients are diagnosed with higher lymph node metastasis and mortality risk than patients with other types of breast cancer in the first five years.