GSTM1 and anemia (phenotype): WM has few specific symptoms, but treatment is required for recurrent fever, weight loss, general fatigue, progressive lymphadenopathy, hepatosplenomegaly, anemia (Hb ≤ 10 g/dL) and thrombocytopenia (≤ 100 000/μL) due to bone marrow infiltration [8, 9, 10].