Abstract
Cetuximab induces responses in about 13% of head and neck squamous cell carcinomas (HNSCC). We describe the molecular mechanism of acquired resistance to cetuximab, which could be overcome by switching to a different anti-EGFR antibody. Biopsies were collected at three different time points: before the start of cetuximab (PRE-cetux), at acquired resistance to cetuximab (AR-cetux), and at acquired resistance to duligotuzumab (AR-duligo). Biopsies were analyzed using tumor and normal whole-exome sequencing, RNASeq, and targeted panel sequencing with ultra-deep coverage to generate differential mutation and expression profiles. WES and targeted sequencing analysis identified an EGFR p.G465R extracellular domain mutation in AR-cetux biopsy. Furthermore, RNASeq confirmed the expression of this mutation in the tumor tissue. This mutation prevented the binding of cetuximab to EGFR and was not present in PRE-cetux and AR-duligo biopsies, suggesting a potential mechanism of acquired resistance to cetuximab. Molecular dynamic simulations confirmed that duligotuzumab effectively binds EGFR with a p.G465R mutation. Interestingly, the p.G465R mutation improved the stability of the duligotuzumab-EGFR complex as compared to the wild-type EGFR. This is the first report of an EGFR ECD mutation associated with acquired resistance to cetuximab, posing a need for further validation. We suggest appropriate serial mutational profiling to identify ECD mutations should be considered for select patients with initial cetuximab benefit.
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Data availability
The data used to support the findings of this study are available from the corresponding authors upon reasonable request.
Code availability
The codes used in different analyses in this study are available from the corresponding authors upon request.
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Contributions
AK: Conceptualization, literature survey, data collection, study design, interpretation of data, writing—review and editing. SN: Next-generation sequencing data analysis, writing, and editing. NA: Molecular Dynamics simulations and writing. S Kaushik: Molecular Dynamics simulations, and writing. S Kochanny: Clinical data collection, review, writing, and editing. DG: Clinical data collection, review, and editing. MWG: Review of patient biopsies, review, and editing. EB: Review and editing. TYS: Conceptualization, study design, interpretation of data, and writing—review and editing.
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Arun Khattri received the financial support from the Department of Biotechnology, Government of India, in the form of Ramalingaswami Fellowship. The funding agency played no role in the study design, analysis, and interpretation of the results. Tanguy Y. Seiwert reports institutional research funding from Regeneron, Merck/MSD, BMS, Genentech, Cue Biopharma, Nanobiotix, Seattle Genetics, Exelixis, Astra Zeneca, IOBiotech, and Kura Oncology; and advisory board and consulting fees from Regeneron, Merck/MSD, Arcus, Astra Zeneca, Regeneron, IOBiotech, Seattle Genetics, Surface Oncology, Sanofi, iTeos, Innate Pharma, EMD Serono, Exelixis, Vir Therapeutics, and Eisei. He is on the DSMB for BioNTech, and the steering committee for IOBiotech.
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Khattri, A., Sheikh, N., Agrawal, N. et al. Switching anti-EGFR antibody re-sensitizes head and neck cancer patient following acquired resistance to cetuximab. Cancer Gene Ther 31, 1477–1485 (2024). https://doi.org/10.1038/s41417-024-00812-5
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DOI: https://doi.org/10.1038/s41417-024-00812-5
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