GSTM1 and paroxysmal nocturnal hemoglobinuria: A 27-year-old man was diagnosed with PNH in 2010 (granulocyte clone size 93%) associated with transfusion dependent anemia (Hb 6.8 g/dL, LDH 7.5 x upper limit of normality, ULN, PLT 121x109/L, neutrophils 1.8 x109/L, reticulocytes 121x109/L) and symptoms of hemolysis with abdominal pain.