Objective To investigate the implications of Th17 cells and its regulatory cytokines in patients with middle to late staged nasopharyngeal carcinoma (NPC) based on a clinical trial. Methods The ratio of Th17 cells in the peripheral blood mononuclear cells (PMBC) was detected among 28 patients with middle to late stage of NPC by the procedures of flow cytometry, and ROR-γt mRNA in PMBC was determined by RT-PCR technique. Furthermore, serum levels of IL-10, IL-7 and IFN-γ were assayed by the use of ELISA Meanwhile, 15 healthy persons were t...