All of the 9 patients presented with normocytic normochromic anemia (Table 2): 2 patients had mild anemia, with hemoglobin (Hb) ≥ 90 g/L; 3 patients had moderate anemia, with Hb 60–90 g/L; and 4 patients had severe anemia, with Hb < 60 g/L, who exhibited underweight and/or stunting (patients 2, 3, 7 and 8). The gene discussed is GSTM1; the disease is anemia (phenotype).