Initial CBC revealed pancytopenia with an Hb level of 8.9 g/dL (normal range, 12.0–14.9 g/dL), a WBC count of 2180 cells/mm3 (normal range, 4400–10,300 cells/mm3), with 68% neutrophils, 12% lymphocytes, and 5% eosinophils, and a platelet count of 106,000 cells/mm3 (normal range, 179,000–435,000 cells/mm3). This evidence concerns the gene GSTM1 and Pancytopenia.