By Spearman’s correlation analysis between the concentrations of CXCL9 and EBV DNA load, we found a statistically significant correlation between the concentrations of CXCL9 and EBV DNA load in the NPC patients (Spearman’s correlation analysis; r = 0.473, P<0.001; 95% confidence interval, 0.346–0.582). The gene discussed is CXCL9; the disease is nasopharyngeal carcinoma.