Initial laboratory tests indicated iron deficiency anemia and an albuminemic state with low hemoglobin (Hb) (73 g/L), total protein (51.1 g/L), albumin (27.5 g/L), prealbumin (39 mg/L), serum iron (2.3 umol/L) and total iron binding capacity (35.44 umol/L) level. The gene discussed is GSTM1; the disease is anemia.