GSTM1 and anemia (phenotype): Upon arrival at the nephrology department in Poznan, the patient's condition was considered severe with dyspnea at rest, tachycardia, hypertension (190/100 mmHg), oliguria, decreased renal function (creatinine 4.69 mg/dL, urea 124 mg/dL), hemolysis (LDH 982 U/L), and severe anemia and thrombocytopenia (Hb 7.9 g/dL, RBC 2.56 × 106/μL, platelets 60 × 103/μL).