GSTM1 and Miyoshi myopathy: Individuals with GSTT1 null and GSTM1 null or TNF-α −308 GA+AA and −208 GA+AA genotypes showed an increased risk of MM when compared with those with GSTT1 present and GSTM1 present or −308 GG and −238 GG genotypes, with OR of 2.82 (p = 0.018) and 5.63 (p < 0.001), respectively (Table 5).