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Mesangial C4d deposition may predict progression of kidney disease in pediatric patients with IgA nephropathy

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An Erratum to this article was published on 17 March 2017

Abstract

Background

Data on the risk factors for chronic kidney disease in children with immunoglobulin A nephropathy (IgAN) are scarce. This study was aimed at investigating whether glomerular C4d immunostaining is a prognostic marker in pediatric IgAN.

Methods

In this retrospective cohort study, 47 patients with IgAN biopsied from 1982 to 2010 were evaluated. Immunohistochemistry for C4d was performed in all cases. For analysis, patients were grouped according to positivity or not for C4d in the mesangial area. Primary outcome was a decline in baseline estimated glomerular filtration rate (eGFR) by 50% or more.

Results

Median follow-up was 8.3 years. Median renal survival was 13.7 years and the probability of a 50% decline in eGFR was 13% over 10 years. Nine children exhibited the primary outcome and 4 developed end-stage renal disease (ESRD). Compared with C4d-negative patients (n = 10), C4d-positive patients (n = 37) presented higher baseline proteinuria (1.66 ± 0.68 vs 0.47 ± 0.19 g/day/1.73 m2, p < 0.001), a progressive decline in eGFR (−10.04 ± 19.38 vs 1.70 ± 18.51 ml/min/1.73 m2/year; p = 0.045), and more frequently achieved the primary outcome (50.0 vs 10.8%, p = 0.013), and ESRD (30.0 vs 2.7%, p = 0.026). No difference was observed in Oxford classification variables. Baseline proteinuria, endocapillary hypercellularity and mesangial C4d deposition were associated with primary outcome in univariate analysis. Proteinuria and mesangial C4d deposition at baseline independently predicted the decline in eGFR. Renal survival was significantly reduced in C4d-positive patients (8.6 vs 15.1 years in C4d-negative patients, p < 0.001).

Conclusions

In this exclusively pediatric cohort, positivity for C4d in the mesangial area was an independent predictor of renal function deterioration in IgAN.

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Acknowledgements

The authors dedicate this work to the deceased Professor José Silvério Santos Diniz, founder of the Pediatric Nephrology Unit, Clinics Hospital, Federal University of Minas Gerais, Brazil. The authors thank Dr Luiz Sérgio Bahia Cardoso, Dr Maria Goretti Moreira Guimarães Penido, and all other colleagues who processed medical records, managed patients, performed renal biopsies, and assisted with follow-up.

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Correspondence to Sérgio Veloso Brant Pinheiro.

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The authors have no conflicts to declare.

Ethical aspects

The Ethics Committee of the Federal University of Minas Gerais approved the study, according to the principles of the Declaration of Helsinki (National protocol CAAE18196713.4.0000.5149).

Financial support

FAPEMIG (Fundação de Amparo à Pesquisa do Estado de Minas Gerais, Brazil), CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brazil), and CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior).

Additional information

An erratum to this article is available at http://dx.doi.org/10.1007/s00467-017-3644-1.

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Fabiano, R.C.G., de Almeida Araújo, S., Bambirra, E.A. et al. Mesangial C4d deposition may predict progression of kidney disease in pediatric patients with IgA nephropathy. Pediatr Nephrol 32, 1211–1220 (2017). https://doi.org/10.1007/s00467-017-3610-y

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