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Sequential development of systemic vasculitis with anti-neutrophil cytoplasmic antibodies complicating
D J O'Donoghue1, C D Short, P E Brenchley
1Department of Renal Medicine, Manchester Royal Infirmary, UK.
Insights
Anti-neutrophil cytoplasmic antibodies (cANCA) can appear in anti-glomerular basement membrane (anti-GBM) disease, particularly in severe cases. These antibodies may indicate a distinct patient subset with systemic vasculitis.
Area of Science:
- Nephrology
- Immunology
- Rheumatology
Background:
- Anti-glomerular basement membrane (anti-GBM) disease is a rare autoimmune disorder.
- Anti-neutrophil cytoplasmic antibodies (cANCA) are typically associated with other forms of vasculitis.
Observation:
- cANCA were detected in three patients with anti-GBM disease.
- These patients presented with severe renal involvement and alveolar hemorrhage.
- Systemic vasculitis developed in one patient as anti-GBM antibodies decreased and cANCA emerged.
Findings:
- The presence of cANCA in anti-GBM disease is associated with late clinical presentation and severe organ involvement.
- cANCA may identify a specific subset of anti-GBM disease patients.
- cANCA positivity correlates with systemic vasculitis beyond the kidneys and lungs.
Implications:
- cANCA may play a pathogenic role in the development of systemic vasculitis in some anti-GBM disease patients.
- Monitoring for cANCA could aid in identifying patients at risk for broader systemic involvement.
- This association may refine diagnostic and therapeutic strategies for anti-GBM disease.
Abstract:
Anti-neutrophil cytoplasmic antibodies (cANCA) were detected in 3 patients with anti-glomerular basement membrane (anti-GBM) disease. All 3 cases presented late in their clinical course, with severe renal involvement and alveolar hemorrhage. Anti-neutrophil cytoplasmic antibodies were associated with clinical features outwith the lungs and kidneys; in one case cANCA were initially absent but subsequently developed concurrently with the clinical appearance of systemic vasculitis as the anti-GBM antibody titer was falling. These findings confirm that cANCA can complicate anti-GBM disease and suggest that cANCA may identify a distinct subset of patients with anti-GBM disease, supporting a pathogenic role for cANCA in the development of systemic vasculitis.