Abstract
Objective
To validate the renal risk score in a cohort of patients with advanced kidney damage.
Methods
A total of 72 patients with biopsy-proven ANCA glomerulonephritis with >12 months of follow-up were studied. The renal risk score was calculated and evaluated by survival analysis for time of renal survival. Cohort-specific clinical, histopathologic, and post-treatment factors associated with renal survival were determined by Cox regression analysis.
Results
Kidney biopsies were classified as focal, crescentic, mixed, and sclerotic classes in 6 (8%), 4 (6%), 25 (35%), and 37 (51%) patients, respectively. The 1-, 3-, and 5-year renal survival rates were 79%, 73%, and 68%, respectively. Patients were segregated by the risk score in low- (18%), medium- (47%), and high-risk (35%) groups. Patients in the low-risk group had 36-, 60-, and 84-month renal survival of 100%; those in the medium risk 85% (95% CI 72–92), 81% (95% CI 66–95), and 76% (95% CI 60–92), respectively; and those in the high risk 37% (95% CI 17–57), 26% (95% CI 7–45), and 18% (95% CI 1–36), respectively. Six (43%) of the 14 patients in the high-risk group recovered renal function after the initial episode, and 2 (14%) remained dialysis-free. Other parameters associated with renal survival included age, proteinuria, general symptoms, cellular crescents, glomerulosclerosis, tubulointerstitial lesions, best post-treatment eGFR, and renal relapses.
Conclusions
We validated the renal risk score as a prognostic tool in a cohort with predominantly mixed and sclerotic histologic categories. Since patients in the high-risk group still benefited from immunosuppressive therapy, this score should be used in conjunction with other predictive parameters to aid therapeutic decisions.
Key Points • The ANCA renal risk score is validated in a cohort with advanced kidney damage. • Patients in the high-risk group still benefited from immunosuppressive therapy. • Parameters not included in the risk score are associated with renal survival and may be useful. |
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Change history
13 March 2020
The footnote of Figure 2 in the published original version of the above article went missing and the correct figure is presented in this article.
Abbreviations
- AAV :
-
ANCA-associated vasculitides
- ANCA :
-
Anti-neutrophil cytoplasmic antibody
- BVAS/GPA :
-
Birmingham Vasculitis Activity Score for Granulomatosis with Polyangiitis
- eGFR :
-
Estimated glomerular filtration rate
- ESR :
-
Erythrocyte sedimentation rate
- FFS :
-
Five-Factor Score
- GPA :
-
Granulomatosis with polyangiitis
- hsCRP :
-
High-sensitive C-reactive protein
- IF/TA :
-
Interstitial fibrosis/tubular atrophy
- I.V :
-
Intravenous
- MPA :
-
Microscopic polyangiitis
- MPO-ANCA :
-
Myeloperoxidase ANCA
- PR3-ANCA :
-
Proteinase 3 ANCA
- RLV :
-
Renal-limited vasculitis
- RRT :
-
Renal replacement therapy
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JMMV, EMN, and AHA designed the study; JMMV, EMN, MLCV, AAPA, MASM, and AHA participated in data acquisition; JMMV, EMN, AAPA, and AHA analyzed and interpreted data; JMMV, EMN, MLCV, AAPA, MASM, and AHA drafted and revised the manuscript.
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The original version of this article was revised: The publisher regret in the Introduction section of the above published article contained an error. The sentence original reading "...(proportion of normal IF, and estimated glomerular filtration/IF,.." should read as "... (proportion of normal glomeruli, percentage of TA/IF,...". [bold text used to highlight problem area]. The article has been corrected.
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Mejía-Vilet, J.M., Martín-Nares, E., Cano-Verduzco, M.L. et al. Validation of a renal risk score in a cohort of ANCA-associated vasculitis patients with severe kidney damage. Clin Rheumatol 39, 1935–1943 (2020). https://doi.org/10.1007/s10067-020-04936-5
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DOI: https://doi.org/10.1007/s10067-020-04936-5