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Background: Nasopharyngeal carcinoma(NPC)can develop cisplatin-resistant phenotype.Research has revealed that enriched in cancer stem cell(CSC)population is involved in developing cisplatin-resistant phenotype.CD271 is a candidate CSC maker in head and neck cancers.The CD receptor does not possess any enzymatic property.Signal transduction function of CD271 is mediated by the cellular receptor-associated protein.