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Validation of a renal risk score in a cohort of ANCA-associated vasculitis patients with severe kidney damage

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A Correction to this article was published on 13 March 2020

This article has been updated

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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Funding

The authors declare that no specific funding was received to carry out the work described in this manuscript.

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Authors

Contributions

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.

Corresponding author

Correspondence to Andrea Hinojosa-Azaola.

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Research was conducted in compliance with the Helsinki Declaration. Approval by the local ethical committee was obtained.

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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

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