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Unclassifiable interstitial lung diseases: Clinical characteristics and survival

Unclassifiable disease in chronic interstitial lung disease (ILD) is a common and challenging problem but has been insufficiently studied. The 2013 update of the international multidisciplinary classification of the idiopathic interstitial pneumonias presented a classification based on observed disease behaviour with the purpose of providing guidance to clinicians in the management of these patients. The aim of this study was to apply the new disease behaviour classification (DBC) and the previously validated ILD‐gender age physiology (GAP) score to a cohort of unclassifiable ILD patients and to assess the prognostic value of these two composite approaches.