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- W2023597833 abstract "We established the frequency of mutation of the epidermal growth factor receptor in bladder cancer and determined whether the activation status of epidermal growth factor receptor confers sensitivity to erlotinib.The identification of mutations in the kinase domain (exons 18-21) of epidermal growth factor receptor was performed using single strand conformation polymorphism. The action of erlotinib was established within a bladder carcinoma cell panel using clonogenic assays and Western blot analysis.In 112 invasive bladder tumors a total of 6 mutations in 4 patients (3.6%) were identified in exon 21. Erlotinib demonstrated concentration dependent inhibition of growth where three cell lines showed high and 2 showed low sensitivity to the drug. Erlotinib inhibited activation of epidermal growth factor receptor, mitogen activated protein kinase, Akt and STAT3. However, the activation status of Akt was maintained in cell lines that were insensitive to the inhibitory action of erlotinib and were characterized as having undergone epithelial-to-mesenchymal transition.Although mutations in the coding region of epidermal growth factor receptor are rare in invasive bladder tumors, differential sensitivity to erlotinib was recorded within a panel of cell lines. Maintenance of the phosphorylation status of Akt in the presence of erlotinib along with epithelial-to-mesenchymal transition correlates with insensitivity to growth inhibition in bladder carcinoma cell lines. Even in the absence of epidermal growth factor receptor mutations erlotinib shows potential as a therapeutic agent for the treatment of bladder cancer." @default.
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- W2023597833 date "2007-10-01" @default.
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- W2023597833 title "Epidermal Growth Factor Receptor Status and the Response of Bladder Carcinoma Cells to Erlotinib" @default.
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- W2023597833 doi "https://doi.org/10.1016/j.juro.2007.05.113" @default.
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