EGFR and non-small cell lung carcinoma: In the univariate survival analysis, NSCLC patients with the high expression level of EGFR had a poorer OS than the low expression group (cutoff expression value: 13.23; P value: 0.021; HazardHR: 1.3; 95% CI: 1–1.7), and this result was quite similar to the expression level of IL-6 (cutoff expression value: 7.72; P value: 0.001; HR: 1.6; 95% CI: 1.2–1.7) (Figures 6(a) and 6(b)).