Absence of retinoblastoma gene product in human primary oral cavity carcinomas

European Journal of Cancer. Part B, Oral Oncology
Z P PavelicJ L Gluckman

Abstract

Oral cavity cancer is a major health concern worldwide. Despite advances in surgery, radiotherapy and chemotherapy over the past 35 years, there has been no significant enhancement in the survival of oral cavity cancer patients. Improved survival will require identification of reliable prognostic markers that provide a rational basis for assessment of risk for progression. The altered retinoblastoma (RB) gene has been linked to the hereditary retinoblastoma. This gene is defective in several types of human malignancies. The intent of this study was to evaluate the role of the RB gene in oral cavity tumorigenesis and to explore whether or not there is a relationship between the loss of RB protein and each of several clinicopathological parameters in oral cavity carcinomas. We have analysed the expression of the RB gene in four cell lines (J82, ML1, SaOS2 and WERI-RB-1), 182 oral cavity carcinomas (75 T1 and 107 T3 and T4 lesions) and 55 normal tissues adjacent to cancer by means of an immunohistochemical method and Western immunoblotting. The expression of RB protein was then correlated with clinical outcome in the patients with primary tumours. The significantly higher rate of altered RB expression was found in advanced oral ca...Continue Reading

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Citations

Jun 7, 2000·Cancer Letters·T YanagawaH Yoshida
Aug 26, 2011·Journal of Dental Research·D T W WongY Kim
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