SGCG and idiopathic pulmonary fibrosis: The objectives of this study were to investigate (1) type I and III collagen turnover measured at baseline as prognostic biomarkers for disease progression at 12 months, (2) longitudinal assessment of type I and III collagen turnover in stable and progressive IPF patients during a 1-year period, and (3) whether antifibrotic therapy has an impact on type I and III collagen turnover.