Cited by 22Colorectal Cancer Treatments and StudiesLung Cancer Treatments and MutationsHER2/EGFR in Cancer Research

Promising Therapeutic Efficacy of GC1118, an Anti-EGFR Antibody, against KRAS Mutation-Driven Colorectal Cancer Patient-Derived Xenografts

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Lee, Hye, Son, Eunju, Lee, Kyoungmin, Lee, Yeri, Kim, Yejin, Lee, Jae-Chul, Lim, Yangmi, Hur, Minkyu +2 more·2019·International Journal of Molecular Sciences

Abstract

Epidermal growth factor receptor (EGFR)-targeted monoclonal antibodies, including cetuximab and panitumumab, are used to treat metastatic colorectal cancer (mCRC). However, this treatment is only effective for a small subset of mCRC patients positive for the wild-type KRAS GTPase. GC1118 is a novel, fully humanized anti-EGFR IgG1 antibody that displays potent inhibitory effects on high-affinity EGFR ligand-induced signaling and enhanced antibody-mediated cytotoxicity. In this study, using 51 CRC patient-derived xenografts (PDXs), we showed that KRAS mutants expressed remarkably elevated autocrine levels of high-affinity EGFR ligands compared with wild-type KRAS. In three KRAS-mutant CRCPDXs, GC1118 was more effective than cetuximab, whereas the two agents demonstrated comparable efficacy against three wild-type KRAS PDXs. Persistent phosphatidylinositol-3-kinase (PI3K)/AKT signaling was thought to underlie resistance to GC1118. In support of these findings, a preliminary improved anti-cancer response was observed in a CRC PDX harboring mutated KRAS with intrinsically high AKT activity using GC1118 combined with the dual PI3K/mammalian target of rapamycin (mTOR)/AKT inhibitor BEZ-235, without observed toxicity. Taken together, the superior antitumor efficacy of GC1118 alone or in combination with PI3K/mTOR/AKT inhibitors shows great therapeutic potential for the treatment of KRAS-mutant mCRC with elevated ratios of high- to low-affinity EGFR ligands and PI3K-AKT pathway activation.

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Crossref · 10.3390/ijms20235894

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  • GC1118 displays inhibitory effects against patient-derived xenografts from colorectal cancer tumours with a KRAS mutation, especially those with elevated expression of high-affinity ligands.

    “In addition, GC1118 is a novel, fully humanized anti-EGFR IgG1 antibody that displays inhibitory effects against patient-derived xenografts from CRC tumours with a KRAS mutation [40], especially in those with elevated expression of high-affinity ligands [72].”

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Authors
Lee, H., Son, E., Lee, K., Lee, Y., Kim, Y., Lee, J.-C., Lim, Y., Hur, M., Kim, D., & Nam, D.-H.
Affiliations
  • Sungkyunkwan University (KR)
  • Samsung Medical Center (KR)
  • Mogam Institute for Biomedical Research (KR)
Corresponding author
  • Kim, Donggeon
  • Nam, Do-Hyun
Venue
International Journal of Molecular Sciences
Publisher
MDPI AG
Published
2019-11-24
Volume
20
Issue
23
Pages
5894
ISSN
1422-0067 (ISSN-L)
OpenAlex
W2989577472
Cited by
22
References
91
Citations by year
2026: 2 · 2025: 3 · 2023: 6 · 2022: 1 · 2021: 8 · 2020: 2
FWCI
1.15
Type
journal article
Language
en
Open access
Locations
  • International Journal of Molecular Sciences (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • The Bio & Medical Technology Development Program of the National Research Foundation (NRF), funded by the National Research Foundation of Korea (NRF), funded by the Ministry of Education, Republic of Korea (NRF-2017R1A2B4011780)
  • The Korean government (MSIP) (NRF-2016R1A5A2945889)
  • The Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare, Republic of Korea (HI14C3418)
Topics
  • Health Sciences › Medicine › Oncology › Colorectal Cancer Treatments and Studies
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Lung Cancer Treatments and Mutations
  • Health Sciences › Medicine › Oncology › HER2/EGFR in Cancer Research
Keywords
anti-EGFR monoclonal antibody, KRAS mutation, metastatic colorectal cancer, patient-derived xenografts, PI3K/Akt signaling, BEZ235, cetuximab, combination therapy, drug resistance
MeSH terms
Cetuximab, Animals, Female, Humans, Mice, Nude, Mutation, Transplantation, Heterologous, Tumor Cells, Cultured, Colorectal Neoplasms, Signal Transduction, Proto-Oncogene Proteins p21(ras), Phosphatidylinositol 3-Kinases, Protein Kinase Inhibitors, Proto-Oncogene Proteins c-akt, Mice, TOR Serine-Threonine Kinases, Antibodies, Monoclonal, Humanized, ErbB Receptors

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