GSTM1 and Pancytopenia: Laboratory tests showed pancytopenia (Hb 3.5 mmol/l, Ht 0.17, MCV 87, reticulocytes 28.6 *109/l, leukocytes 3.5 *109/L with differentiation 41% neutrophiles, 50% lymphocytes and 8% monocytes, platelets 45 *109L).