Out of these patients, 5 (20.8%) were β-thalassemia carriers and 4 (16.7%) α-thalassemia, and 15 (62.5%) were mixed group (5 β-thalassemia and IDA, 5 α-thalassemia and IDA, 1 pregnant α-thalassemia, 2 Hb S, and 2 pregnant HbS). This evidence concerns the gene GSTM1 and thalassemia.