GSTM1 and anemia: Another subject was diagnosed with double heterozygous IVS-II-806 (G > C) and Hb New York, compound -α4.2/αα mutation, and Hb Q-Thailand and presented mild microcytic hypochromic anemia with decreased HbA2 level, elevated HbF level, and detectable level of Hb New York (Hb 121 g/L, MCV 73.8 fL, MCH 24.8 pg, HbA2 2.1%, HbF 17.6%, and Hb New York 28.2%) (Table 3).