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BMC Pediatrics
Published in: BMC Pediatrics 1/2023

Open Access 01-12-2023 | IgA Vasculitis | Research

Comparative study on clinicopathological features and prognosis of IgA vasculitis nephritis and IgA nephropathy in children

Authors: Yan Lv, Rui Fu, Xiao-Jie Peng, Ying Wang, Ting-Ting Yin, Yan-Qing Deng

Published in: BMC Pediatrics | Issue 1/2023

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Abstract

Background

IgA vasculitis nephritis (IgAVN) and IgA nephropathy (IgAN) share several clinical and pathological characteristics, though distinctions also exist. Their interrelation, however, remains undefined. This study investigates the clinicopathological divergences and prognostic disparities in pediatric patients with IgAVN and IgAN.

Methods

Our study encompasses 809 pediatric patients with IgAVN and 236 with IgAN, all of whom underwent kidney biopsy. We utilized the Semiquantitative Classification (SQC) scoring system to juxtapose the pathologies of the two conditions, and performed a COX regression analysis to examine factors influencing their prognoses.

Results

Both patient groups demonstrated a predominance of males. A seasonality was observed, with a higher incidence of IgAN in the summer, and IgAVN in the fall (P < 0.0001). Patients with IgAN exhibited more severe tubulointerstitial injury, higher chronicity index, and total biopsy scores compared to those with IgAVN (P < 0.0001). Mesangial deposition intensity of complement C3, and the rate of pure IgA deposition, were found to be greater in patients with IgAVN compared to those with IgAN (P < 0.0001). The intensity of IgA deposition was also significantly higher in IgAVN patients (P = 0.003). IgAVN demonstrated a superior prognosis, with a higher rate of kidney remission (P < 0.0001). COX regression analysis indicated that interstitial fibrosis, as identified in the SQC pathology system, was associated with the prognosis of both conditions. Furthermore, the findings suggest that IgA deposition levels (IgA +  + and IgA +  + +) could potentially influence the prognosis of IgAVN.

Conclusions

Compared to IgAVN, IgAN manifests more severely with regard to renal impairment, interstitial damage, and prognosis. The disparities in immune complex deposition levels and locations within the kidneys support the hypothesis of IgAVN and IgAN as distinct diseases. Interstitial fibrosis may serve as a key pathological indicator within the SQC system associated with kidney prognosis in children with IgAVN and IgAN. The degree of IgA deposition could also be linked with the prognosis of IgAVN.
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Metadata
Title
Comparative study on clinicopathological features and prognosis of IgA vasculitis nephritis and IgA nephropathy in children
Authors
Yan Lv
Rui Fu
Xiao-Jie Peng
Ying Wang
Ting-Ting Yin
Yan-Qing Deng
Publication date
01-12-2023
Publisher
BioMed Central
Published in
BMC Pediatrics / Issue 1/2023
Electronic ISSN: 1471-2431
DOI
https://doi.org/10.1186/s12887-023-04243-3

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