IL6 and metastatic malignant neoplasm in the lymph nodes: The results of the multivariable logistic regression model revealed that prior lung disease (OR: 1.63; [95% CI, 1.02-3.31], P = .037), impaired pulmonary function (OR: 2.78; [95% CI, 1.38-5.24], P < .001), lymph node metastasis (OR: 3.05; [95% CI, 1.65-6.21], P < .001), and preoperative IL-6 elevation (OR: 1.58; [95% CI, 1.36-1.83], P < .001) were significantly associated with the occurrence of PPCs (Table 3).