IPF and non-specific interstitial pneumonia (NSIP), as well as the other entities of IIPs (cryptogenic organizing pneumonia, COP; desquamative interstitial pneumonia, DIP; respiratory bronchiolitis interstitial lung disease, RB-ILD; lymphoid interstitial pneumonia, LIP; acute interstitial pneumonia, AIP) are frequently progressive, fibroproliferative diseases of unknown etiology, affecting the lung parenchyma. Patients with IPF have the most devastating prognosis within the group of IIPs, with a median survival rate of 2-3 years.