The area under curve (AUC) values of CRP, IL-6, IGF-1, and their combination in predicting postoperative lung infection in elderly patients with LC were 0.701, 0.806, 0.737, and 0.871, P < .05), with sensitivity values of 0.443, 0.987, 0.456, and 0.835, respectively; The specificity was 0.978, 0.525, 0.991, and 0.821, respectively (Table 4 and Fig. 1). The gene discussed is CRP; the disease is laryngotracheoesophageal cleft.