TNF and dermatomyositis: Only under the allele model (A allele vs. G allele: P<0.0001), and the dominant model (AA+AG vs. GG: P<0.0001), meta-analysis suggested apparently significant on the association between TNF-α-238A/G polymorphism and DM risk; and only under the dominant model (CC+CT vs. TT: P = 0.039), meta-analysis suggested apparently significant on the association between TNF-α-1031T/C polymorphism and DM risk.