Granulomatosis with polyangiitis with and without antineutrophil cytoplasmic antibodies: a case-control study

This is the authors' abstract. We don't add key points for this paper.

ANCA-negative GPA remains a diagnosis of exclusion. Clinical differences between patients with ANCA-negative vs ANCA-positive GPA have not been analyzed in sizable case-control studies, and the effects of ANCA-seroconversion from negative to positive are not well documented.