GSTM1 and anemia (phenotype): Preoperatively, the patient's laboratory data showed moderate anemia (hemoglobin - Hb 11.4g/dl and hematocrit 33%), no thrombocytopenia (platelet count 209.109/liter) and known chronic renal failure (serum creatinine 181 mmol/liter, glomerular filtration rate 35 ml/min/1.73m2).