Objective: The antineutrophil cytoplasmic antibody (ANCA)-associated vasculitides are heterogeneous disorders. The aim of this study was to identify and characterize subgroups of patients based on sex, ANCA, age at diagnosis, and organ involvement.
Methods: In total, 1,167 patients with granulomatosis with polyangiitis (GPA) or microscopic polyangiitis (MPA) were retrospectively recruited to the study.