Epidermal growth factor receptor (EGFR) is a transmembrane protein that is activated by binding of its specific ligands. Epidermal growth factor receptor isoform (EGFRvA) has higher tumor-promoting capacity than EGFR. Moreover, EGFRvA is more stable than EGFR because of its decreased binding to E3 ubiquitin ligase c-CbI. EGFRvA as a drug target is associated with lung cancer, colon cancer, anal cancer, glioblastoma and epithelian tumors of the head and neck.
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