Kaplan–Meier curves for the time until myeloperoxidase-antineutrophil cytoplasmic antibody (MPO-ANCA)-positive conversion (A: MPO-ANCA, B: proteinase 3 [PR3]-ANCA) in patients with idiopathic pulmonary fibrosis. Kaplan–Meier curves for the time until myeloperoxidase-antineutrophil cytoplasmic antibody (MPO-ANCA)-positive conversion (A: MPO-ANCA, B: proteinase 3 [PR3]-ANCA) in patients with idiopathic pulmonary fibrosis. Naho Kagiyama et al. BMJ Open Resp Res 2015;2:e000058 ©2015 by British Thoracic Society