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Targeting EGFR in bladder cancer.

Abstract：

:Expression and overexpression of the epidermal growth factor receptor (EGFR) have been described in several solid tumors including bladder, breast, colorectal, NSCLC, prostate, and ovarian cancers. In addition to gene amplification, point mutations within the kinase domain also occur. Previous reports indicate that the patient's response to gefitinib depends on either the presence of mutations within the kinase domain of EGFR or the expression of the most frequent alteration, the truncated EGFR variant III (EGFRvIII). Therefore, it is important to determine if these EGFR alterations are present in urothelial carcinoma. The kinase domain of EGFR (exons 18-21) from 11 bladder cancer cell lines as well as from 75 patient tumors was analyzed by automated sequencing. No mutations were detected in all samples tested. Furthermore, analysis of EGFRvIII by immunohistochemistry revealed that almost half of all the patient samples expressed this truncation in a urothelial carcinoma tissue microarray. However, there have been previous reports of inconsistencies in detecting EGFRvIII by immunohistochemistry owing to the specificity of the antibodies and the methodologies utilized. Therefore, these results were validated by reverse transcription PCR, real-time PCR and western blot analysis. In these assays, none of the samples tested positive for EGFRvIII. Taken together, these results indicate that mutations within the tyrosine kinase domain of EGFR and expression of EGFRvIII are rare events in bladder cancer and therefore do not contribute to the malignant phenotype of this tumor. These results have clinical implications in selecting tyrosine kinase inhibitors for the therapy of urothelial carcinoma.

journal_name

World J Urol

journal_title

World journal of urology

authors

Villares GJ,Zigler M,Blehm K,Bogdan C,McConkey D,Colin D,Bar-Eli M

doi

10.1007/s00345-007-0202-7

subject

Has Abstract

pub_date

2007-12-01 00:00:00

pages

573-9

issue

6

eissn

0724-4983

issn

1433-8726

journal_volume

25

pub_type

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