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Significant correlations between serum OPN and ferritin levels were observed (r=0.317, P=0.038). Although OPN and ferritin were both associated with mortality in Univariate Cox hazards analysis, OPN was an independent predictor of the prognosis of DM-ILD rather than ferritin in Multivariate Cox hazards analysis. OPN can be expressed in lung tissues but also can exist as a secreted form in serum, and serum OPN may be a more valuable prognostic biomarker in DM-ILD patients with anti-MDA5 antibody than the serum ferritin. OPN can be expres