PSMA6 and chronic obstructive pulmonary disease: In addition, majority (58.7%) of lung transplant patients have interstitial pulmonary fibrosis, with 9.6% having a primary diagnosis of chronic obstructive pulmonary disease (COPD)/Emphysema, 5.3% hypersensitivity pneumonitis, 11.4% connective tissue disease, 4.4% Alpha-1-Anti-Trypsin disease, 3.5% Bronchiolitis Obliterans, 3.5% pulmonary arterial hypertension, and 3.5% cystic fibrosis.