Kaplan–Meier curves for the time until development of microscopic polyangiitis (MPA) (A) and for survival (B) in myeroperoxidase-antineutrophil cytoplasmic antibody-positive or antibody-positively converted patients with idiopathic pulmonary fibrosis accord... Kaplan–Meier curves for the time until development of microscopic polyangiitis (MPA) (A) and for survival (B) in myeroperoxidase-antineutrophil cytoplasmic antibody-positive or antibody-positively converted patients with idiopathic pulmonary fibrosis according to corticosteroid treatment. The incidence of the development of MPA tended to be lower in patients treated than not treated with corticosteroids (log-rank test: p=0.063). The difference in survival curves between patients treated and not treated with corticosteroids was not significant (log-rank test: p=0.323). Naho Kagiyama et al. BMJ Open Resp Res 2015;2:e000058 ©2015 by British Thoracic Society