The preoperative blood test showed malnutrition (ALB 3.4 g/dl, pre-albumin 19.3 mg/dl, RBP 2.0 mg/dl), anemia (Hb 10.4 g/dl), and no jaundice (total-bilirubin 0.8 mg/dl). The gene discussed is GSTM1; the disease is anemia.