TY - JOUR TI - Methotrexate and interstitial lung disease: Controversies and questions. A narrative review of the literature AU - Fragoulis, G.E. AU - Conway, R. AU - Nikiphorou, E. JO - Rheumatology (United Kingdom) PY - 2019 VL - 58 TODO - 11 SP - 1900-1906 PB - Oxford University Press SN - null TODO - 10.1093/rheumatology/kez337 TODO - methotrexate; antirheumatic agent; methotrexate, cardiovascular inflammation; human; interstitial lung disease; lung disease; meta analysis; pneumonia; priority journal; randomized controlled trial (topic); Review; rheumatoid arthritis; systematic review; clinical trial (topic); interstitial lung disease; observational study; pneumonia; rheumatoid arthritis, Antirheumatic Agents; Arthritis, Rheumatoid; Clinical Trials as Topic; Humans; Lung Diseases, Interstitial; Methotrexate; Observational Studies as Topic; Pneumonia TODO - MTX, which is the anchor-drug for the treatment of RA, has been associated with lung injury and in particular with MTX-related pneumonitis (M-pneu). Although the frequency of M-pneu has been reported to range between 0.3 and 11.6%, more recent studies and meta-analyses have challenged that, suggesting that it is less common than previously thought. M-pneu is considered a hypersensitivity reaction usually occuring early after MTX commencement, and to be dose-independent. Furthermore, it does not seem to be truly related to the development of interstitial lung disease observed in some patients as part of the natural history of RA (RA-ILD). On the other hand, there are data suggesting that clinicians should be cautious when commencing MTX in patients with pre-existing lung disease. However, treatment should not be delayed or limited in progressive RA that could lead to RA-ILD, and MTX remains one of the central players in the treat-to-target approach. In this review, we aimed to summarize the current evidence from observational studies and clinical trials on lung disease in MTX-treated RA patients. We focus the discussion on the lack of association between M-pneu and RA-ILD. © 2019 The Author(s). ER -