Cited by 739Lung Cancer Treatments and MutationsColorectal Cancer Treatments and StudiesHER2/EGFR in Cancer Research

Assessment of somatic k-RAS mutations as a mechanism associated with resistance to EGFR-targeted agents: a systematic review and meta-analysis of studies in advanced non-small-cell lung cancer and metastatic colorectal cancer

Linardou, Helena, Dahabreh, Issa J, Kanaloupiti, Dimitra, Siannis, Fotios, Bafaloukos, Dimitrios, Kosmidis, Paris, Papadimitriou, Christos A, Murray, Samuel·2008·The Lancet Oncology

Abstract

Background Somatic mutations of the k-RAS oncogene have been assessed as a mechanism of de-novo resistance to epidermal growth factor receptor (EGFR) tyrosine-kinase inhibition in patients with non-small-cell lung cancer (NSCLC), and to anti-EGFR monoclonal antibodies in patients with metastatic colorectal cancer (mCRC). The aim of this systematic review and meta-analysis was to assess if k-RAS mutations represent a candidate predictive biomarker for anti-EGFR-targeted therapeutic strategies in mCRC and NSCLC.Methods We systematically identified articles pertaining to k-RAS mutational status in patients with NSCLC treated with tyrosine-kinase inhibitors (TKI), and patients with mCRC treated with any anti-EGFR-based regimens. Eligible studies had to report complete responses (CR) and partial responses (PR), stratified by k-RAS mutational status. Potential between-study heterogeneity was accommodated by use of random-effects models for bivariable meta-analysis of sensitivity and specificity (the primary endpoints). The positive and negative likelihood ratios (+LR and -LR, respectively) of k-RAS mutations for predicting an absence of response were considered as secondary endpoints and were calculated by use of pooled estimates for sensitivity and specificity.Findings Of 252 retrieved manuscripts, 17 were deemed eligible for the NSCLC meta-analysis (165 of 1008 patients with mutated k-RAS). The presence of k-RAS mutations was significantly associated with an absence of response to TKIs (sensitivity=0.21 [95% CI 0.16-0.28], specificity=0.94 [0.89-0.97]; +LR=3.52; -LR=0.84). Of 68 retrieved manuscripts reporting on anti-EGFR monoclonal-antibody-based treatment of mCRC, eight studies were deemed eligible for the final analysis (306 of 817 patients with mutated k-RAS). The presence of k-RAS mutations was significantly associated with an absence of response to anti-EGFR monoclonal-antibody-based treatments (sensitivity=0.47 [0.43-0.52]; specificity=0.93 [0.83-0.97]; +LR=6.82; -LR=0.57).Interpretation This analysis provides empirical evidence that k-RAS mutations are highly specific negative predictors of response (de-novo resistance) to single-agent EGFR TKIs in advanced NSCLC; and similarly to anti-EGFR monoclonal antibodies alone or in combination with chemotherapy in patients with mCRC. The low sensitivity and relatively high -LR of k-RAS mutations for determining non-responsiveness clearly shows that additional mechanisms of resistance to EGFR inhibitors exist.

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Crossref · 10.1016/s1470-2045(08)70206-7

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Authors
Linardou, H., Dahabreh, I. J., Kanaloupiti, D., Siannis, F., Bafaloukos, D., Kosmidis, P., Papadimitriou, C. A., & Murray, S.
Affiliations
  • Metropolitan Hospital (GR)
  • National and Kapodistrian University of Athens (GR)
  • Hygeia Hospital (GR)
Corresponding author
Murray, Samuel
Venue
The Lancet Oncology
Publisher
Elsevier BV
Published
2008-10
Volume
9
Issue
10
Pages
962-972
ISSN
1470-2045 (ISSN-L)
OpenAlex
W2128059540
Cited by
739
References
95
Citations by year
2026: 8 · 2025: 11 · 2024: 11 · 2023: 21 · 2022: 15 · 2021: 23 · 2020: 23 · 2019: 16 · 2018: 29 · 2017: 46 · 2016: 56 · 2015: 53 · 2014: 71 · 2013: 68 · 2012: 84
FWCI
10.71
Type
journal article
Language
en
Open access
closed
Locations
  • The Lancet Oncology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Lung Cancer Treatments and Mutations
  • Health Sciences › Medicine › Oncology › Colorectal Cancer Treatments and Studies
  • Health Sciences › Medicine › Oncology › HER2/EGFR in Cancer Research
Keywords
KRAS mutation, anti-EGFR therapy, drug resistance, predictive biomarkers, non-small cell lung cancer, metastatic colorectal cancer, tyrosine kinase inhibitors, anti-EGFR monoclonal antibody, treatment response, sensitivity and specificity, likelihood ratios, advanced cancer, predictive biomarker validation, EGFR tyrosine kinase inhibitor resistance, anti-EGFR antibody resistance
MeSH terms
Antibodies, Monoclonal, Antineoplastic Agents, Carcinoma, Non-Small-Cell Lung, Colonic Neoplasms, Genetic Markers, Humans, Lung Neoplasms, Mutation, Prognosis, Genes, ras, Likelihood Functions, Drug Resistance, Neoplasm, Protein Kinase Inhibitors, ErbB Receptors

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