Abstract
INTRODUCTION: YKL-40 is a novel biomarker in diseases with inflammation, fibrosis and tissue remodelling. Previously, circulating YKL-40 was shown to be elevated in patients with idiopathic pulmonary fibrosis (IPF) and was associated with survival. OBJECTIVE: To compare YKL-40 serum levels between IPF and other interstitial pneumonias such as non-specific interstitial
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