In the multivariate logistic regression model, greater risk of infection was associated preoperatively with NNIS score greater than 1 (OR = 10.6; 95% CI: 1.1-102.0; p = 0.04) and preoperative albumin < 3 g/dl (OR = 8.77; 95% CI: 1.13-67.86; p = 0.03), even after adjusting for sex, age, malnutrition, ASA, cancer diagnosis and LOS. The gene discussed is ALB; the disease is nutritional deficiency disease.