Risk Stratification to Predict Renal Survival in Anti-Glomerular Basement Membrane Disease

Area of Science:

• Nephrology
• Immunology
• Glomerular Diseases

Background:

• Anti-glomerular basement membrane (GBM) disease often presents as rapidly progressive glomerulonephritis, frequently leading to end-stage kidney disease (ESKD).
• Limited tools exist for prognostication and management of this rare condition.

Purpose of the Study:

• To investigate clinical and histologic parameters predicting kidney outcomes in anti-GBM disease.
• To explore the transferability of the renal risk score (RRS) from ANCA-associated vasculitis to anti-GBM disease.
• To identify patients who may benefit from rescue immunosuppressive therapy.

Main Methods:

• Retrospective, multicenter, international cohort study of 174 patients with anti-GBM disease.
• Analysis of clinical and histologic parameters, including the percentage of normal glomeruli and need for renal replacement therapy (RRT) at diagnosis.
• Application and validation of the RRS concept.

Main Results:

• The RRS strongly predicted ESKD, with 36-month renal survival rates of 100% (low-risk), 62.4% (moderate-risk), and 20.7% (high-risk).
• Need for RRT and percentage of normal glomeruli were independent predictors of ESKD.
• A model incorporating RRT and normal glomeruli percentage achieved superior discrimination for renal survival, with distinct outcomes across four risk groups.

Conclusions:

• The RRS concept is transferable and applicable to anti-GBM disease.
• Stratification by RRT status and renal histology (specifically normal glomeruli percentage) significantly improves outcome prediction.
• This stratification approach can aid in the clinical management of anti-GBM disease.