As shown in Figure 3, the plasma levels of IFN‐γ were significantly lower (p < .0001), whereas the plasma levels of TNF‐α, IL‐6 and IL‐10 were significantly higher (p < .0001, p = .041, and p < .0001, respectively) in NPC patients than in controls. This evidence concerns the gene IFNG and nasopharyngeal carcinoma.