The protein levels of IL-27 were significant negatively correlated with the frequencies of Th17 cells and with the RORγt mRNA in the peripheral blood of NSCLC patients (r = −0.989, P < 0.001; r = −0.989, P < 0.001, Figures 5(b) and 5(c)). The gene discussed is IL27; the disease is non-small cell lung carcinoma.