Cited by 145Colorectal Cancer Treatments and StudiesLung Cancer Treatments and MutationsCancer Genomics and Diagnostics

Molecular Characterization of Acquired Resistance to KRASG12C–EGFR Inhibition in Colorectal Cancer

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Yaeger, Rona, Mezzadra, Riccardo, Sinopoli, Jenna, Bian, Yu, Marasco, Michelangelo, Kaplun, Esther, Gao, Yijun, Zhao, HuiYong +26 more·2023·Cancer Discovery

Published version of a preprint

Abstract

With the combination of KRASG12C and EGFR inhibitors, KRAS is becoming a druggable target in colorectal cancer. However, secondary resistance limits its efficacy. Using cell lines, patient-derived xenografts, and patient samples, we detected a heterogeneous pattern of putative resistance alterations expected primarily to prevent inhibition of ERK signaling by drugs at progression. Serial analysis of patient blood samples on treatment demonstrates that most of these alterations are detected at a low frequency except for KRASG12C amplification, a recurrent resistance mechanism that rises in step with clinical progression. Upon drug withdrawal, resistant cells with KRASG12C amplification undergo oncogene-induced senescence, and progressing patients experience a rapid fall in levels of this alteration in circulating DNA. In this new state, drug resumption is ineffective as mTOR signaling is elevated. However, our work exposes a potential therapeutic vulnerability, whereby therapies that target the senescence response may overcome acquired resistance. Significance: Clinical resistance to KRASG12C–EGFR inhibition primarily prevents suppression of ERK signaling. Most resistance mechanisms are subclonal, whereas KRASG12C amplification rises over time to drive a higher portion of resistance. This recurrent resistance mechanism leads to oncogene-induced senescence upon drug withdrawal and creates a potential vulnerability to senolytic approaches. Watch the interview with Sandra Misale, PhD, recipient of the 2025 Cancer Discovery Early Career Award: https://vimeo.com/1100471486 This article is highlighted in the In This Issue feature, p. 1

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Crossref · 10.1158/2159-8290.cd-22-0405

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  • Acquired mutations of NRAS, BRAF, RTK, and MYC were found in patients treated with sotorasib or adagrasib monotherapy.

    “Acquired mutations of NRAS, BRAF, RTK, and MYC were also found in patients treated with sotorasib or adagrasib monotherapy [49, 51, 53, 54].”

    From Differential Response and Resistance to KRAS-Targeted Therapy (2025) · cites this paper as [53]

    The Results section reports acquired NRAS and BRAF mutations, RTK activation, and MYC amplification in colorectal cancer patients treated with adagrasib plus cetuximab or sotorasib plus panitumumab—not monotherapy. The Introduction discusses resistance to KRAS G12C monotherapy, but does not report this full list for monotherapy patients. RTK activation and MYC amplification also cannot all be described as mutations. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • KRAS G12C amplification was a consistent resistance mechanism that increased in frequency over the duration of treatment of CRC patients and cell lines treated with combinations of KRAS and EGFR inhibitors.

    “KRAS G12C amplification was a consistent resistance mechanism that increased in frequency over the duration of the treatment of CRC patients and cell lines treated with combinations of KRAS and EGFR inhibitors [101].”

    From KRAS: Biology, Inhibition, and Mechanisms of Inhibitor Resistance (2024) · cites this paper as [101]

    The Results section on resistance dynamics in ctDNA reports that KRAS G12C amplification increased steadily with tumor-marker response during treatment in CRC patients. The Results section on resistance mechanisms also identifies amplification in a resistant cell line, supporting its recurrence, but does not show that its frequency increased over the treatment period in cell lines. Page numbers are unavailable in our copy. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • Post-treatment analysis of NSCLC and CRC samples from patients treated with sotorasib or adagrasib identified de novo oncogenic mutations secondary to treatment, including multiple amplifications and point mutations in KRAS G12C itself.

    “Post-treatment analysis of NSCLC and CRC samples from patients treated with either sotorasib or adagrasib identified de novo oncogenic mutations secondary to treatment, including multiple amplifications and point mutations in KRAS G12C itself [101].”

    From KRAS: Biology, Inhibition, and Mechanisms of Inhibitor Resistance (2024) · cites this paper as [101]

    The Results section reports resistance-associated KRAS G12C amplification and KRAS point mutations in samples from CRC patients treated with adagrasib plus cetuximab or sotorasib plus panitumumab. It does not report post-treatment analysis of NSCLC samples, and it describes the alterations as emergent at resistance rather than establishing that treatment caused de novo mutations. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Cells that become resistant to the combination of KRASi and EGFRi are sensitive to mTOR inhibition.

    “Of note, cells that become resistant to the combination of KRASi and EGFRi are sensitive to mTOR inhibition [101].”

    From KRAS: Biology, Inhibition, and Mechanisms of Inhibitor Resistance (2024) · cites this paper as [101]

    The Results section, “Exploiting the new steady state after drug withdrawal to overcome resistance” (page not provided), reports that resistant RW7213 cells were more sensitive to the mTOR inhibitor AZD8055 after withdrawal of the KRAS G12C–EGFR inhibitor combination than during continuous exposure. The claim omits those conditions and generalizes the finding to resistant cells broadly; the paper frames mTOR blockade as a potential approach for resistant cancers with KRAS G12C amplification following drug withdrawal. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Emerging genetic alterations have been shown to mediate resistance to KRAS G12C inhibitors combined with EGFR inhibitors in CRC patients.

    “Furthermore, emerging genetic alterations have been shown to mediate resistance to KRAS G12C inhibitors combined with EGFR inhibitors in CRC patients.”

    From Differential Response and Resistance to KRAS-Targeted Therapy (2025) · cites this paper as [53]

    The Results section ('Mechanisms of resistance to combined KRAS G12C and EGFR inhibition'; no page available) reports emergent genetic alterations in CRC patients who progressed on combination treatment. The 'Resistance dynamics' Results section identifies KRAS G12C amplification as a substantial resistance mechanism, but describes many other patient alterations as low-frequency and putative; the claim overstates how firmly those alterations were shown to mediate resistance. (LLM, conf=0.85)

    Experimental — accuracy not yet measured

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Authors
Yaeger, R., Mezzadra, R., Sinopoli, J., Bian, Y., Marasco, M., Kaplun, E., Gao, Y., Zhao, H., Paula, A. D. C., Zhu, Y., Perez, A. C., Chadalavada, K., Tse, E., Chowdhry, S., Bowker, S., Chang, Q., Qeriqi, B., Weigelt, B., Nanjangud, G. J., Berger, M. F., Der-Torossian, H., Anderes, K., Socci, N. D., Shia, J., Riely, G. J., Murciano-Goroff, Y. R., Li, B. T., Christensen, J. G., Reis-Filho, J. S., Solit, D. B., de Stanchina, E., Lowe, S. W., Rosen, N., & Misale, S.
Affiliations
  • Memorial Sloan Kettering Cancer Center (US)
  • Boundless Bio (United States) (US)
  • 9Mirati Therapeutics, Inc., San Diego, California.
  • Mirati Therapeutics (United States) (US)
  • 1Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York.
  • 4Antitumour Assessment Core Facility, Memorial Sloan Kettering Cancer Center, New York, New York.
Corresponding author
  • Yaeger, Rona
  • Misale, Sandra
Venue
Cancer Discovery
Published
2022-11-10
Volume
13
Issue
1
Pages
41-55
ISSN
  • 2159-8274 (ISSN-L)
  • 2159-8290
OpenAlex
W4308683759
Cited by
144
References
51
Citations by year
2026: 37 · 2025: 49 · 2024: 36 · 2023: 22
FWCI
11.19
Type
journal article
Language
en
Open access
Locations
  • Cancer Discovery (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Cold Spring Harbor Laboratory Institutional Repository (Cold Spring Harbor Laboratory) (acceptedVersion)
Funders
  • National Institutes of Health (R01 CA233736, U54 OD020355, P30 CA008748, K30 UL1TR00457)
  • Cancer Research Institute (CRI 3441)
  • Conquer Cancer Foundation (YIA)
Topics
  • Health Sciences › Medicine › Oncology › Colorectal Cancer Treatments and Studies
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Lung Cancer Treatments and Mutations
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer Genomics and Diagnostics
Keywords
KRAS G12C, EGFR inhibition, acquired drug resistance, colorectal cancer, KRAS amplification, ERK signaling, oncogene-induced senescence, mTOR signaling, circulating tumor DNA, senolytic therapy, patient-derived xenografts
MeSH terms
Animals, Disease Models, Animal, Humans, Mutation, Colorectal Neoplasms, Signal Transduction, Proto-Oncogene Proteins p21(ras), Drug Resistance, Neoplasm, ErbB Receptors

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