Abstract
In the last decade remarkable progress has been made in the treatment of metastatic colorectal cancer due to the introduction of oxaliplatin and irinotecan in clinical practice. The addition of biological agents seems to offer a chance to further enhance the activity of conventional chemotherapy. Cetuximab, a chimeric mouse-human monoclonal antibody targeting the extracellular domain of the epidermal growth factor receptor (EGFR), has shown low but detectable activity when employed in pretreated patients either as a single agent or in combination with irinotecan. Cetuximab in combination with irinotecan has been registered in the USA and Europe for the treatment of patients with metastatic colorectal cancer expressing the EGFR after failure of prior irinotecan-based cytotoxic therapy. The role of cetuximab in first-line therapy is still investigational. Some phase II trials assessing cetuximab plus chemotherapy demonstrated a high objective response rate and promising results in terms of time to progression and overall survival; data from phase III trials are pending. Further studies are needed to investigate the efficacy of cetuximab in combination with conventional chemotherapy in the adjuvant/neoadjuvant setting and to define criteria for a better selection of patients for this type of treatment.
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