A second CBC revealed pancytopenia with a WBC count of 4.5 × 109/L (reference: 4.0–10.0 × 109/L), Hb level of 58 g/L, Plt count of 46 × 109/L (reference: 100.0-300.0 × 109/L), mean corpuscular volume (MCV) of 106 fL (reference: 80–100 fL), mean corpuscular Hb (MCH) of 33.5 pg/cell (reference: 27–34 pg/cell), and red blood cell volume distribution width (RDW) of 24.6% (reference: 11.6%-16.5%). This evidence concerns the gene GSTM1 and Pancytopenia.