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NCI: A drug that is used to treat certain types of non-small cell lung cancer and is being studied in the treatment of other types of cancer. It is a type of epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor.,PDQ: An anilinoquinazoline with antineoplastic activity. Gefitinib inhibits the catalytic activity of numerous tyrosine kinases including the epidermal growth factor receptor (EGFR), which may result in inhibition of tyrosine kinase-dependent tumor growth. Specifically, this agent competes with the binding of ATP to the tyrosine kinase domain of EGFR, thereby inhibiting receptor autophosphorylation and resulting in inhibition of signal transduction. Gefitinib may also induce cell cycle arrest and inhibit angiogenesis. Check for "http://www.cancer.gov/Search/ClinicalTrialsLink.aspx?id=43649&idtype=1" active clinical trials or "http://www.cancer.gov/Search/ClinicalTrialsLink.aspx?id=43649&idtype=1&closed=1" closed clinical trials using this agent. ("http://nciterms.nci.nih.gov:80/NCIBrowser
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