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Published in: Pediatric Nephrology 2/2022

01-02-2022 | Rituximab | Original Article

Anti-rituximab antibodies in pediatric steroid-dependent nephrotic syndrome

Authors: Quentin Bertrand, Sabine Mignot, Theresa Kwon, Anne Couderc, Anne Maisin, Alexandra Cambier, Véronique Baudouin, Marine Peyneau, Georges Deschênes, Julien Hogan, Claire Dossier

Published in: Pediatric Nephrology | Issue 2/2022

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Abstract

Background

Rituximab is a chimeric anti-CD20 monoclonal antibody that induces sustained remission in children with steroid-dependent nephrotic syndrome. However, there is no consensus on the optimal regimen and monitoring of rituximab. In other autoimmune diseases, anti-rituximab antibodies (ARA) have been reported in 10–40% of patients, but their clinical relevance remains unclear. In nephrotic syndrome, data are scarce.

Methods

We report a single-center retrospective study with immuno- and pharmacological monitoring of rituximab treatment in children with frequent relapsing (FR) or steroid-dependent nephrotic syndrome (SDNS). We analyzed the monthly monitoring of 24 children, receiving a dose of rituximab (375 mg/m2) between December 2017 and April 2018 at the Pediatric Nephrology Department of Robert-Debré hospital, Paris.

Results

ARA were detected in 7/24 patients (29%), sometimes after the first infusion of rituximab. ARA were present at baseline in two patients previously treated with rituximab. Both displayed no B-cell depletion. ARA were also reported in 5/22 patients during follow-up, with antibodies always detected in the first month following B-cell recovery. An incomplete CD19+CD20− B-cell depletion at M1 (5–25/mm3) and low serum rituximab levels was predictive of developing ARA. The development of de novo ARA during follow-up was not associated with shorter B-cell depletion.

Conclusions

This study shows that ARA are frequent in children with FR/SDNS and that close immuno- and pharmacological monitoring may help personalizing rituximab treatment in patients needing repeated injections.
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Metadata
Title
Anti-rituximab antibodies in pediatric steroid-dependent nephrotic syndrome
Authors
Quentin Bertrand
Sabine Mignot
Theresa Kwon
Anne Couderc
Anne Maisin
Alexandra Cambier
Véronique Baudouin
Marine Peyneau
Georges Deschênes
Julien Hogan
Claire Dossier
Publication date
01-02-2022
Publisher
Springer Berlin Heidelberg
Published in
Pediatric Nephrology / Issue 2/2022
Print ISSN: 0931-041X
Electronic ISSN: 1432-198X
DOI
https://doi.org/10.1007/s00467-021-05069-w

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