作者: Jim R Woodburn , Susan E Ashton , Simon P Guy , Keith H Gibson , Brenda J Curry
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摘要: The epidermal growth factor receptor (EGFR) is a promising target for anticancer therapy because of its role in tumor growth, metastasis and angiogenesis, resistance to chemotherapy radiotherapy. We have developed low-molecular-weight EGFR tyrosine kinase inhibitor (EGFR-TKI), ZD1839 (Iressa(2) ). ZD1839, substituted anilinoquinazoline, potent EGFR-TKI (IC(50) = 0.033 micro M) that selectively inhibits EGF-stimulated cell 0.054 blocks autophosphorylation cells. In studies with mice bearing range human tumor-derived xenografts, given p.o. once day inhibited dose-dependent manner. level expression did not determine xenograft sensitivity ZD1839. Long-term (>3 months) treatment A431 xenografts was well tolerated, completely induced regression established tumors. No drug-resistant tumors appeared during treatment, but some regrew after drug withdrawal. These indicate the potential utility many continuous once-a-day dosing might be suitable therapeutic regimen.