TSLP and hypersensitivity pneumonitis: Here, we measured the IL-25, IL-33, and TSLP levels in a relatively large cohort of patients with IPF and other interstitial lung diseases, including non-specific interstitial pneumonia (NSIP), hypersensitivity pneumonitis (HP), and sarcoidosis in order to evaluate the significance of these cytokines on clinical outcomes of IPF.