Oncogenic activation of the RAS/RAF signaling pathway impairs the response of metastatic colorectal cancers to anti-epidermal growth factor receptor antibody therapies

Silvia Benvenuti, Andrea Sartore-Bianchi, Federica Di Nicolantonio, Carlo Zanon, Mauro Moroni, Silvio Veronese, Salvatore Siena, Alberto Bardelli

Research output: Contribution to journalArticle

Abstract

Monoclonal antibodies (mAbs) against the extracellular domain of the epidermal growth factor receptor (EGFR) have been introduced for the treatment of metastatic colorectal cancer (mCRC). We have reported recently that increased copy number of the EGFR can predict response to anti-EGFR mAbs and that patients might be selected for treatment based on EGFR copy number. Here, we show that mutations activating the RAS/RAF signaling pathway are also predictive and prognostic indicators in mCRC patients, being inversely correlated with response to anti-EGFR mAbs. In cellular models of CRCs, activation of the RAS signaling pathway by introduction of an activated K-RAS allele (Gly 12Val) impairs the therapeutic effect of anti-EGFR mAbs. In cancer cells carrying constitutively active RAS, the pharmacologic inhibition of the mitogen-activated protein kinase (MAPK) signaling cascade improves anti-EGFR treatment based on mAbs. These results have implications for the identification of patients who are likely to respond to anti-EGFR treatment. They also provide the rationale for combination therapies, targeted simultaneously to the EGFR and RAS/ RAF/MAPK signaling pathways in CRC patients.

Original languageEnglish
Pages (from-to)2643-2648
Number of pages6
JournalCancer Research
Volume67
Issue number6
DOIs
Publication statusPublished - Mar 15 2007

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

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