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Emerging RAS, BRAF, and EGFR mutations in cell-free DNA of metastatic colorectal patients are associated with both primary and secondary resistance to first-line anti-EGFR therapy

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Abstract

Oncogenic RAS mutations are negative biomarkers of response to epidermal growth factor receptor (EGFR) blockade. RAS mutations are usually detected in biopsies of primary colorectal tumors. However, the genomic profiles of primary tumors and metastases are not always concordant, and chemotherapeutic agents can alter the tumor molecular landscape. Cell-free DNA (cfDNA) is a novel tool to detect molecular heterogeneity. This study evaluated the clinical utility of cfDNA to predict primary or secondary resistance to EGFR blockade in patients with metastatic colorectal cancer. Thirty metastatic colorectal cancer patients without RAS and BRAF mutations were prospectively enrolled and treated with cytotoxic agents and EGFR blockade as first-line therapy. cfDNA was analyzed for the presence of RAS, BRAF, and EGFR (S492R) point mutations before initiating chemotherapy and every 2 months during chemotherapy. The analysis was performed in 223 plasma samples from all 30 patients. Of the 30 patients, five had RAS mutations in their cfDNA before starting chemotherapy and did not respond. Twenty-four of the remaining 25 patients without cfDNA RAS mutations had a response. Twenty of the 24 responders developed secondary resistance and cfDNA RAS mutations were found in 17 of the 20. cfDNA BRAF mutations were found in seven, and EGFR mutations were found in eight of the 20 patients. Emerging RAS, BRAF, and EGFR mutations occurred in patients with primary and secondary resistance to EGFR blockade. The detection of these mutations in cfDNA is a promising approach to predict treatment response and secondary resistance.

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Data availability

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

EGFR:

Epidermal growth factor receptor

cfDNA:

Cell-free DNA

mCRC:

Metastatic colorectal cancer

ETS:

Early tumor shrinkage

CR:

Complete response

PR:

Partial response

SD:

Stable disease

RECIST:

Response Evaluation Criteria in Solid Tumors

dPCR:

Digital PCR

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Acknowledgments

We thank Mr. Masaaki Higuchi for technical support in the experiments. We also thank H. Nikki March, PhD, from Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript.

Funding

This work was supported by JSPS KAKENHI Grant Number 17K10657. Funding was also provided locally by the Department of Gastrointestinal and Hepato-Biliary-Pancreatic Surgery, Nippon Medical School, Tokyo, Japan.

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Authors

Contributions

TY designed this article, acquisitioned of the data and wrote this paper. MK, SS, GT, TI, KT, SK and KU acquisitioned, analyzed and interpreted the data. AM and RO checked the manuscript. HY supervised its quality and revised the paper. All authors have read and approved the final manuscript.

Corresponding author

Correspondence to Takeshi Yamada.

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Competing interests

The authors declare that they have no competing interests.

Ethics approval and consent to participate

This study was approved by Medical Ethics Committee of Nippon Medical School, and written informed consent was obtained from the patients prior to sample collection. All experimental procedures were performed according to the regulations and internal biosafety and bioethics guidelines.

Patient consent for publication

Written informed consent was obtained from the patients.

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Yamada, T., Matsuda, A., Takahashi, G. et al. Emerging RAS, BRAF, and EGFR mutations in cell-free DNA of metastatic colorectal patients are associated with both primary and secondary resistance to first-line anti-EGFR therapy. Int J Clin Oncol 25, 1523–1532 (2020). https://doi.org/10.1007/s10147-020-01691-0

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  • DOI: https://doi.org/10.1007/s10147-020-01691-0

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