Age ≥ 65 years, BMI ≥ 25 kg/m2, positive smoking history, American Society of Anesthesiologist (ASA) score ≥ 3, comorbidity, preoperative hemoglobin < 100 g/L, preoperative albumin < 35 g/L, with complications due to the tumor, open procedure, longer operative time (≥ 240 min), larger intraoperative blood loss (≥ 300 mL), and BTF was all found as potential risk factors for postoperative infections by univariate analyses (all P values < 0.05; Table 2). The gene discussed is ALB; the disease is infection.