IFIH1 and dermatomyositis: As for the characteristic of high heterogeneity in DM, we compared the expression of RIG-I between anti-MDA5+ (n = 10), anti-ASS+ (n = 5), and the remaining patients (n = 11, including 5 patients for MSA−, 2 patients for anti-NXP2+, 2 patients for anti-SAE+, 1 patient for anti-TIFγ+, 1 patient for anti-Mi2+).