In another study to investigate the associations of GSTM1 and GSTT1 polymorphisms with type 1 diabetes (T1DM), the results suggest that the GSTM1 null genotype is associated with T1DM protection and T1DM age-at-onset and that susceptibility to T1DM may involve GST conjugation [19]. This evidence concerns the gene GSTM1 and type 1 diabetes mellitus.