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The 5-year MPA incidence was 24.3% in the MPO-ANCA-positive IIP patients and 0% in the MPO-ANCA-negative IIP patients. P <0.0001 by log-rank test. IIPs, idiopathic interstitial pneumonias; MPA, microscopic polyangiitis; MPO-ANCA, myeloperoxidase-anti-neutrophil cytoplasmic antibody.
