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Research Article| Volume 7, SUPPLEMENT 1, S8-S15, December 2007

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A Retrospective on the Inhibition of Epidermal Growth Factor Receptor as a Therapeutic Strategy for Patients with Relapsed Metastatic Colorectal Cancer: Impact on Treatment of Today's Patients

  • Author Footnotes
    1 Dr Jackson has no relevant relationships to disclose.
    Christopher Jackson
    Footnotes
    1 Dr Jackson has no relevant relationships to disclose.
    Affiliations
    Clinical Research Fellow, Royal Marsden Hospital London and Surrey, United Kingdom
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  • Author Footnotes
    2 Dr Cunningham has received research support from Roche, Merck, Amgen, and AstraZeneca and has served as a paid consultant or been on an Advisory Board for Roche, Amgen, Bristol-Myers Squibb, Merck, Pfizer, and AstraZeneca.
    David Cunningham
    Correspondence
    Address for correspondence: David Cunningham MD, FRCP, Gastrointestinal and Lymphoma Units, Royal Marsden Hospital London and Surrey, Downs Rd, Sutton SM2 5PT Surrey, United Kingdom Fax: 44-0-208-643-9414
    Footnotes
    2 Dr Cunningham has received research support from Roche, Merck, Amgen, and AstraZeneca and has served as a paid consultant or been on an Advisory Board for Roche, Amgen, Bristol-Myers Squibb, Merck, Pfizer, and AstraZeneca.
    Affiliations
    Gastrointestinal and Lymphoma Units, Royal Marsden Hospital London and Surrey, United Kingdom
    Search for articles by this author
  • Author Footnotes
    1 Dr Jackson has no relevant relationships to disclose.
    2 Dr Cunningham has received research support from Roche, Merck, Amgen, and AstraZeneca and has served as a paid consultant or been on an Advisory Board for Roche, Amgen, Bristol-Myers Squibb, Merck, Pfizer, and AstraZeneca.
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      Abstract

      The epidermal growth factor receptor (EGFR) pathway is overexpressed in many colorectal cancers (CRCs) and is associated with a worse prognosis compared with tumors that do not express EGFR. The development of monoclonal antibodies against this receptor, including cetuximab and panitumumab, and small-molecule inhibitors against the tyrosine kinase protein has led to new therapeutic paradigms in the treatment of metastatic CRC (mCRC). The anti-EGFR monoclonal antibody cetuximab has been shown to reverse chemotherapy resistance in patients with irinotecanrefractory mCRC, to improve survival compared with best supportive care (BSC) alone, and to prolong progression free-survival (PFS) in the first-and second-line settings. Panitumumab prolongs PFS compared with BSC, and trials in the first-and second-line settings are ongoing. Clinical trials with tyrosine kinase inhibitors have yielded disappointing results. This article reviews the clinical trial evidence for treatment strategies based on EGFR inhibition in relapsed/refractory mCRC, mechanisms of resistance to EGFR agents, clinical uncertainties, and future directions.

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