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Published in: BMC Cancer 1/2012

Open Access 01-12-2012 | Research article

Beyond KRAS mutation status: influence of KRAScopy number status and microRNAs on clinical outcome to cetuximab in metastatic colorectal cancer patients

Authors: Leonie JM Mekenkamp, Jolien Tol, Jeroen R Dijkstra, Inge de Krijger, M Elisa Vink-Börger, Shannon van Vliet, Steven Teerenstra, Eveline Kamping, Eugène Verwiel, Miriam Koopman, Gerrit A Meijer, J Han JM van Krieken, Roland Kuiper, Cornelis JA Punt, Iris D Nagtegaal

Published in: BMC Cancer | Issue 1/2012

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Abstract

Background

KRAS mutation is a negative predictive factor for treatment with anti-epidermal growth factor receptor (EGFR) antibodies in metastatic colorectal cancer (mCRC). Novel predictive markers are required to further improve the selection of patients for this treatment. We assessed the influence of modification of KRAS by gene copy number aberration (CNA) and microRNAs (miRNAs) in correlation to clinical outcome in mCRC patients treated with cetuximab in combination with chemotherapy and bevacizumab.

Methods

Formalin-fixed paraffin-embedded primary tumour tissue was used from 34 mCRC patients in a phase III trial, who were selected based upon their good (n = 17) or poor (n = 17) progression-free survival (PFS) upon treatment with cetuximab in combination with capecitabine, oxaliplatin, and bevacizumab. Gene copy number at the KRAS locus was assessed using high resolution genome-wide array CGH and the expression levels of 17 miRNAs targeting KRAS were determined by real-time PCR.

Results

Copy number loss of the KRAS locus was observed in the tumour of 5 patients who were all good responders including patients with a KRAS mutation. Copy number gains in two wild-type KRAS tumours were associated with a poor PFS. In KRAS mutated tumours increased miR-200b and decreased miR-143 expression were associated with a good PFS. In wild-type KRAS patients, miRNA expression did not correlate with PFS in a multivariate model.

Conclusions

Our results indicate that the assessment of KRAS CNA and miRNAs targeting KRAS might further optimize the selection of mCRC eligible for anti-EGFR therapy.
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Metadata
Title
Beyond KRAS mutation status: influence of KRAScopy number status and microRNAs on clinical outcome to cetuximab in metastatic colorectal cancer patients
Authors
Leonie JM Mekenkamp
Jolien Tol
Jeroen R Dijkstra
Inge de Krijger
M Elisa Vink-Börger
Shannon van Vliet
Steven Teerenstra
Eveline Kamping
Eugène Verwiel
Miriam Koopman
Gerrit A Meijer
J Han JM van Krieken
Roland Kuiper
Cornelis JA Punt
Iris D Nagtegaal
Publication date
01-12-2012
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2012
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-12-292

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