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Comparability of Antibody-Mediated Cell Killing Activity Between a Proposed Biosimilar RTXM83 and the Originator Rituximab

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Abstract

Background

Biosimilars are described as biological products that resemble the structure of original biologic therapeutic products, with no clinically meaningful differences in terms of safety and effectiveness from the original. A wide range of biosimilars are under development or are already licensed in many countries. Biosimilars are earning acceptance and becoming a reality for immunotherapy treatments mainly based on the alternatives for the commercial anti-CD20 monoclonal antibody rituximab. The most important mechanism of action reported for this antibody is the induction of antibody-dependent cell cytotoxicity (ADCC), which is associated with the polymorphisms present at the 158 position in the IgG receptor FcγRIIIa.

Objective

The aim of the study was to validate the functional comparability between the proposed rituximab biosimilar RTXM83 and the original product. To achieve this we assessed the binding capacity and ADCC induction of this biosimilar, taking into account the different FcγRIIIa-158 polymorphisms.

Methods

Binding capacity was evaluated by flow cytometry using CD20 positive cells and a wide range of antibody concentrations. The FcγRIIIa-158 polymorphisms were analyzed by polymerase chain reaction (PCR) followed by allele-specific restriction enzyme digestion. ADCC was measured by a colorimetric lactate dehydrogenase-release assay, using effector cells from donors with different FcγRIIIa-158 polymorphisms.

Results

Binding capacity assay showed no differences between both products. Regarding ADCC, a similar relative potency was obtained between both antibodies, showing a higher response for the FcγRIIIa-158 valine/valine (V/V) polymorphism compared to the phenylalanine/phenylalanine (F/F), for both rituximab and RTXM83.

Conclusion

Our data strongly suggest the biocomparability between the proposed biosimilar and the originator rituximab, in antibody recognition and ADCC activity. Additionally, our results suggest that donors with the FcγRIIIa-158V/V polymorphism induce a higher ADCC response, as has been reported.

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Acknowledgements

We would like to thank Ph.D. student Marina Pifano for the statistical support in this work.

Author contributions

All authors made substantial contributions to the conception or design of the work and/or the acquisition, analysis or interpretation of data. All authors were involved in developing and critically revising the content of the manuscript, and all provided final approval of the version submitted for publication. Mariano R. Gabri is the guarantor for the overall content.

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Correspondence to Mariano R. Gabri.

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Conflict of interest

Hector A. Cuello, Valeria I. Segatori, Marina Alberto, Daniel F. Alonso and Mariano R. Gabri have no conflicts of interest that are directly relevant to the content of this study. Analía Pesce is a full-time employee of PharmADN. The authors have no other conflicts of interest related to this work.

Funding

This work was supported by the National Institute of Cancer, Quilmes National University and the National Bureau of Science and Technology (Argentina). Hector A. Cuello is student fellow of the National Institute of Cancer. MRG and DFA are members of the National Research Council (CONICET, Argentina).

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Cuello, H.A., Segatori, V.I., Alberto, M. et al. Comparability of Antibody-Mediated Cell Killing Activity Between a Proposed Biosimilar RTXM83 and the Originator Rituximab. BioDrugs 30, 225–231 (2016). https://doi.org/10.1007/s40259-016-0171-8

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  • DOI: https://doi.org/10.1007/s40259-016-0171-8

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