In the subgroup of lung cancer patients, IL-6 level at FU1 and FU2 correlated with OS (FU1: HR: 1.127, 95% CI: 1.036–1.226, p = 0.006, FU2: HR: 1.094, 95% CI: 1.011–1.184, p = 0.027). Here, IL6 is linked to lung cancer.