Increased levels of prostaglandin E−major urinary metabolite (PGE-MUM) in chronic fibrosing interstitial pneumonia

•PGE-MUM were elevated in chronic fibrosing interstitial pneumonia(CFIP).•PGE-MUM levels were correlated with lung function in CFIP.•Metaplastic epithelial cells can be a source of elevated PGE-MUM in IPF.