GSTM1 and Pancytopenia: The median age at the onset of hematologic abnormalities was 5.87 years (ranging from 0.25 to 13 years) Pancytopenia was the predominant presentation in the majority of patients (50%), with median peripheral hemoglobin (Hb) levels, platelet counts (PLTs), and absolute neutrophil counts (ANC) of 78 (44–125 g/l), 54 (10–263 × 109/l), and 1.41 (0.13–5.08 × 109/l), respectively.