The laboratory examinations revealed macrocytic anemia [hemoglobin (Hb), 8.3 g/dl; mean corpuscular volume (MCV), 106.6 fl], polymorphonuclear leukocytosis [white blood cell (WBC) count, 1.8×109/l], a platelet count of 3×109/l and a C-reactive protein level of 164.0 mg/l (normal, <8 mg/l). The gene discussed is GSTM1; the disease is macrocytic anemia.