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Published in: BioDrugs 3/2017

Open Access 01-06-2017 | Original Research Article

Evaluation of the Cross-reactivity of Antidrug Antibodies to CT-P13 and Infliximab Reference Product (Remicade): An Analysis Using Immunoassays Tagged with Both Agents

Authors: Walter Reinisch, Jørgen Jahnsen, Stefan Schreiber, Silvio Danese, Julián Panés, Alejandro Balsa, Won Park, JiSoo Kim, Jee Un Lee, Dae Hyun Yoo

Published in: BioDrugs | Issue 3/2017

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Abstract

Background

During two pivotal clinical trials of the infliximab biosimilar CT-P13 (PLANETAS and PLANETRA), antidrug antibodies (ADAs) and neutralising antibodies (NAbs) were detected in the sera of patients treated with CT-P13 and the reference product (RP; Remicade).

Objective

The aim was to assess the comparability of Remicade- and CT-P13-tagged immunoassays for the detection of ADAs and NAbs using data from these trials, in order to determine the cross-reactivity of CT-P13 and RP ADAs.

Methods

Sera from patients with rheumatoid arthritis and ankylosing spondylitis were analysed using an electrochemiluminescence (ECL) bridging assay or Gyros immunoassay, tagged with Remicade or CT-P13 at screening, weeks 14, 30 and 54, and the end of study visit. NAb titre was compared at screening and weeks 14 and 30. The proportion of cross-reactive samples was determined and an inter-rater agreement analysis performed to assess the concordance of results between assays.

Results

In PLANETAS, 93.1% (94/101) of RP ADA-positive samples and 93.0% (93/100) of RP NAb-positive samples cross-reacted with CT-P13; 99.0% (103/104) of CT-P13 ADA-positive and 98.0% (98/100) of CT-P13 NAb-positive samples cross-reacted with the RP. In PLANETRA, 94.7% (426/450) of RP ADA-positive samples and 94.3% (415/440) of RP NAb-positive samples cross-reacted with CT-P13, and 96.6% (458/474) of CT-P13 ADA-positive and 96.4% (452/469) of CT-P13 NAb-positive samples cross-reacted with the RP. In both studies, there was strong agreement in outcome between assays at all post-screening time points (PLANETAS: Cohen’s κ 0.89–0.98 for ADA, 0.86–0.98 for NAb; PLANETRA: 0.92–0.94 for both ADA and NAb, all p < 0.001). Significant concordance between assays was observed for NAb titre at weeks 14 and 30 (PLANETAS: Spearman’s ρ 0.73 and 0.74, respectively; PLANETRA: 0.61 and 0.72, respectively; all p < 0.001).

Conclusions

This study has demonstrated that ADAs and NAbs against CT-P13 and RP are cross-reactive, indicating that CT-P13 and RP share immunodominant epitopes.
Appendix
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Metadata
Title
Evaluation of the Cross-reactivity of Antidrug Antibodies to CT-P13 and Infliximab Reference Product (Remicade): An Analysis Using Immunoassays Tagged with Both Agents
Authors
Walter Reinisch
Jørgen Jahnsen
Stefan Schreiber
Silvio Danese
Julián Panés
Alejandro Balsa
Won Park
JiSoo Kim
Jee Un Lee
Dae Hyun Yoo
Publication date
01-06-2017
Publisher
Springer International Publishing
Published in
BioDrugs / Issue 3/2017
Print ISSN: 1173-8804
Electronic ISSN: 1179-190X
DOI
https://doi.org/10.1007/s40259-017-0219-4

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