HLA-DQA1 and dermatomyositis: Compared with the controls, the frequency of HLA-DQA1*0104 was significantly higher in the DM group than in the PM group (16.42% vs. 8.18%, p = 0.01, pcorr NS; OR = 2.58; 95% CI: 1.18–5.74), implying a possible positive correlation between HLA-DQA1*0104 and the risk of DM.