GSTM1 and malnutrition: Preoperative blood test showed liver disorder (AST 42 U/I, ALT 87 U/I), malnutrition (ALB 3.0 g/dl, pre-albumin 15.6 mg/dl, retinol binding protein (RBP) 2.4 mg/dl) and anemia (Hb 8.4 g/dl).