GSTM1 and anemia: 77% of patients (27/35) were anemic (with a hemoglobin range from 72 to 105 g/L) at their first hospitalization, 10 of whom had a hemoglobin (Hb) concentration ≤ 90 g/L, and no patients exhibited severe anemia (hemoglobin ≤ 60 g/L).