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Objective
Interferon‐λ3 (IFNλ3) is a cytokine with antiviral functions on barrier surfaces, and it is associated with disease activity in autoimmune diseases. This study assessed the clinical significance of serum IFNλ3 levels in polymyositis/dermatomyositis (PM/DM)–associated interstitial lung disease (ILD).
Methods
We measured serum IFNλ3 levels in 221 patients with PM/DM‐ILD (155 in the derivation...