Our previous study of 114 patients with PM/DM-ILD indicated that older age, acute/subacute form of ILD, lower FVC, and CADM diagnosis were associated with poor prognosis [9], whereas other reports identified the presence of anti-MDA-5 antibody and higher levels of serum ferritin as indices of poor prognoses [14, 15, 34]. This evidence concerns the gene IFIH1 and clinically amyopathic dermatomyositis.