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      Nuclear EGFR as a molecular target in cancer.

      Radiotherapy and Oncology
      Animals, Cell Line, Tumor, Drug Resistance, Neoplasm, Humans, Neoplasms, drug therapy, Proliferating Cell Nuclear Antigen, physiology, Proto-Oncogene Proteins c-akt, antagonists & inhibitors, Pyrazoles, pharmacology, Radiation Tolerance, Receptor, Epidermal Growth Factor, Sulfonamides

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          Abstract

          The epidermal growth factor receptor (EGFR) has been one of the most targeted receptors in the field of oncology. While anti-EGFR inhibitors have demonstrated clinical success in specific cancers, most patients demonstrate either intrinsic or acquired resistance within one year of treatment. Many mechanisms of resistance to EGFR inhibitors have been identified, one of these being attributed to alternatively localized EGFR from the cell membrane into the cell's nucleus. Inside the nucleus, EGFR functions as a co-transcription factor for several genes involved in cell proliferation and angiogenesis, and as a tyrosine kinase to activate and stabilize proliferating cell nuclear antigen and DNA dependent protein kinase. Nuclear localized EGFR is highly associated with disease progression, worse overall survival in numerous cancers, and enhanced resistance to radiation, chemotherapy, and the anti-EGFR therapies gefitinib and cetuximab. In this review the current knowledge of how nuclear EGFR enhances resistance to cancer therapeutics is discussed, in addition to highlighting ways to target nuclear EGFR as an anti-cancer strategy in the future. Copyright © 2013 Elsevier Ireland Ltd. All rights reserved.

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