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Prognostic significance and targeting of HER family in colorectal cancer.

Colorectal cancer is one of the leading causes of cancer deaths. At present, anti-epidermal growth factor receptor (EGFR) monoclonal antibodies (mAbs) cetuximab and panitumumab and anti-vascular endothelial growth factor (VEGF) mAb bevacizumab have been incorporated into treatment paradigms for patients with refractory metastatic colorectal cancer. However, many patients simply do not respond to these treatments or eventually acquire resistance following a short course therapy. In this article, we review the literature for studies on the expression patterns, prognostic significance and predictive value of HER (also called erbB) family members and other factors for response to therapy with the HER inhibitors in colorectal cancer. We discuss some of the advances, challenges as well as future opportunities for more effective targeting of the HER receptors using a cocktail of HER inhibitors (e.g. dual and pan HER TKIs, monospecific or bispecific antibodies) in combination with other therapeutic interventions.