GSTM1 and Thrombocytopenia: There were also some associated hematological changes, such as the following: 20% anemia (Hb < 11 g/dL), 16.5% leukopenia (<4000/mm3) or leukocytosis (>12,000/mm3), and 16.5% thrombocytopenia (<150,000/mm3) (Table A2).