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Coadministration with bendamustine restores the antitumor activity of obinutuzumab in obinutuzumab-resistant tumors

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Abstract

Background

The glycoengineered, humanized anti-CD20 antibody obinutuzumab is indicated for previously untreated or relapsed/refractory CD20-positive follicular lymphoma (FL). However, the effectiveness of obinutuzumab retreatment in relapsed/refractory FL after prior obinutuzumab-containing therapy is unclear. To address this issue, we investigated the antitumor activity of obinutuzumab plus bendamustine in obinutuzumab-resistant tumors established from a human non-Hodgkin lymphoma xenograft model.

Materials and methods

Obinutuzumab-resistant tumors (SU-DHL-4-OR-18-8) were established from an SU-DHL-4 xenograft model by repeated administration of obinutuzumab. Antitumor activity was evaluated based on tumor volume after treatment with obinutuzumab on Day 1, 8, and 15 and/or bendamustine on Day 1 and 2. Intratumoral natural killer (NK) cells/macrophages were evaluated by immunohistochemistry and flow cytometry.

Results

In SU-DHL-4-OR-18-8 xenografted tumors, intratumoral NK cells/macrophages after obinutuzumab treatment were significantly decreased compared with parent tumors on Day 4. The endoplasmic reticulum stress sensor phospho-IRE1 was also decreased. In SU-DHL-4-OR-18-8 tumors, bendamustine treatment increased phospho-IRE1 on Day 4 and intratumor NK cells/macrophages on Day 10. Obinutuzumab combined with bendamustine significantly increased antitumor activity compared with each single agent on Day 29, with an increase in chemoattractant CCL6 expression on Day 10.

Conclusions

Coadministration of bendamustine in obinutuzumab retreatment may be effective against obinutuzumab-resistant tumors.

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Acknowledgements

The authors thank Dr. Yoshiaki Isshiki, Dr. Kazushige Mori, and Dr. Kaori Fujimoto-Ouchi (all from Chugai Pharmaceutical Co., Ltd.) for their helpful advice, and Ms. Masako Miyazaki, Ms. Hiromi Sawamura, and Ms. Ikuno Sugimoto (all from Chugai Pharmaceutical Co., Ltd.) for their excellent technical assistance with the experiments.

Funding

Funding was provided by Chugai Pharmaceutical Co., Ltd. and Nippon Shinyaku Co., Ltd.

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Authors and Affiliations

Authors

Contributions

YYK established the study concept, conceived the idea, designed and performed the experiments, analyzed the data, and prepared the manuscript. NH, OK, and YY supervised the study and conducted critical revision to the manuscript. KY, TF, and MK performed the experiments. TF, NK, and SY interpreted the results and reviewed and revised the manuscript. All authors contributed to the final manuscript and approved it for submission.

Corresponding author

Correspondence to Yoriko Yamashita-Kashima.

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Conflict of interest

All authors are employees of Chugai Pharmaceutical Co., Ltd. This research was funded by Chugai Pharmaceutical Co., Ltd. and Nippon Shinyaku Co., Ltd.

Ethics approval and consent to participate

All animal experiments were reviewed and approved by the Institutional Animal Care and Use Committee at Chugai Pharmaceutical Co., Ltd. (approval numbers: 17-122, 18-042, 19-139 and 19-329).

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Yamashita-Kashima, Y., Yorozu, K., Fujimura, T. et al. Coadministration with bendamustine restores the antitumor activity of obinutuzumab in obinutuzumab-resistant tumors. Int J Hematol 115, 860–872 (2022). https://doi.org/10.1007/s12185-022-03320-0

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