Hematological abnormalities were common: 87.3% of patients had thrombocytopenia (platelets <150,000 cells/mm3), 71.0% had hematuria (>3 red blood cell per high power field [RBC/HPF]), and 78.4% had anemia (male: Hb<13.0 g/dL, female: Hb<12.0 g/dL) at baseline. The gene discussed is GSTM1; the disease is anemia.