Initial laboratory investigations revealed a normocytic, hypochromic anemia with a hemoglobin (Hb) of 9.6 g/dL (normal: 14–18 g/dL), a mean corpuscular volume (MCV) of 78 fL (normal: 77–91 fL), and a mean corpuscular hemoglobin (MCH) of 23 pg (normal: 25–32 pg). This evidence concerns the gene GSTM1 and anemia (phenotype).