RA - Rheumatoid Arthritis, DMARDS - Disease-Modifying Antirheumatic Drugs, ILD - Interstitial Lung Diseases, UIP - Usual Interstitial Pneumonia, TNF - Tumor Necrosis Factor, HRCT - High-Resolution Computed Tomography, HLA - Human Leukocyte Antigen, SE - Shared Epitope. This evidence concerns the gene TNF and idiopathic pulmonary fibrosis.