GSTM1 and thalassemia: It was reported that double heterozygous HbE with α+-thalassaemia showed near-normal FBC indices and a higher HbE percentage, with mean Hb (13.1 g/dL±1.4 SD), MCV (mean 88±4 SD), and HbE percentage (mean 28.5±1.5 SD) [47,50].