In the multivariate analysis, age, sex, smoking status, Eastern Cooperative Oncology Group performance status, pulmonary function, Charlson comorbidity index, carcinoembryonic antigen value, histological type of lung cancer, differentiation of tumor, visceral pleural invasion, lymphovascular invasion, resection margin, and lung cancer staging did not affect the incidence of postoperative complications. The gene discussed is CEACAM5; the disease is lung carcinoma.