Some of the data of this study were in agreement with previous reports [7,8,9,16,17,18,19,20], and our current study also indicated that the molecular spectrum of α-thalassemias is quite heterogeneous in Turkey, as all together 9 deletional and non-deletional mutations and 10 combinations of them were found to be associated with Hb H disease. Here, GSTM1 is linked to thalassemia.