GSTM1 and thalassemia: Correlations of serum hepcidin and ferritin levels were not statistically significant in any of the three groups of thalassemia patients with BTM (rs = −0.141, P=0.602), BE (rs = 0.065, P=0.739), or Hb H+AE Bart’s (rs = −0.016, P=0.953) (Table 3).