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Overexpression of the transcriptional factor Hes1 (hairy and enhancer of split-1) has been observed in numerous cancers,but the precise roles of Hes1 in epithelial-mesenchymal transition (EMT),cancer invasion and metastasis remain unknown.Our current study firstly revealed that Hes 1 upregulation in a cohort of human nasopharyngeal carcinoma (NPC) biopsies is significantly associated with the EMT,invasive and metastatic phenotypes of cancer.In the present study,we found that Hes1 overexpression triggered EMT-like cellular marker alterations of NPC cells,whereas knockdown of Hesl through shRNA reversed the EMT-like phenotypes,as strongly supported by Hes1-mediated EMT in NPC clinical specimens described above.