Thirteen of the 28 patients had pancytopenia (anemia: Hb <10 g/dl, leukopenia: WBC < 4 × 109/l, and thrombocytopenia: platelets < 150 × 109/l), 13/28 had bicytopenia (anemia or/and leukopenia or/and thrombocytopenia), 1/28 had thrombocytopenia and neutropenia without leukopenia and 1/28, only thrombocytopenia. The gene discussed is GSTM1; the disease is Decreased total leukocyte count.