At the age of 6 years, she was noted as having mild anemia: hemoglobin (Hb), 10.5 g/dL; mean corpuscular volume (MCV), 89 fL; mean corpuscular hemoglobin (MCH), 30.2 pg; white blood cell (WBC) count, 5500/cumm; and platelet count, 32.2 × 104. Here, GSTM1 is linked to anemia (phenotype).