Retinoblastoma protein in human breast carcinoma: immunohistochemical study using a new monoclonal antibody effective on routinely processed tissues

The Journal of Pathology
J J AndersonC H Horne

Abstract

Cyclic phosphorylation/dephosphorylation of the retinoblastoma gene product (pRB) has been found to play a central role in the progression of the normal cell cycle, through modulation of the activity of the E2F family of transcription factors. Mutations of the retinoblastoma gene have been described in a wide variety of human malignancies including carcinomas of the breast. The present investigation reports the production and application of a new monoclonal antibody in an immunohistochemical study of pRB expression in 233 primary breast carcinomas, allowing an assessment of the contribution made by this tumour suppressor gene to tumour development and progression. Overall, there was loss of pRB expression in 21 per cent of breast tumours. Although high-grade tumours were found to lack detectable pRB more frequently than low-grade tumours, the difference did not prove statistically significant. In addition, pRB immunostaining was not related significantly to relapse or survival. No significant correlations were observed between apparent loss of pRB and tumour size, parity, patient lymph-node status, p53, c-erbB-2, c-jun, EGFR or steroid hormone receptor expression. Preliminary findings, however, did suggest a relationship betwee...Continue Reading

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Citations

Jul 28, 2013·Modern Pathology : an Official Journal of the United States and Canadian Academy of Pathology, Inc·Giuseppe S BoginaGiuseppe Zamboni
Jan 15, 2009·Nature Reviews. Cancer·Erik S Knudsen, Karen E Knudsen
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Aug 4, 2001·Annals of Oncology : Official Journal of the European Society for Medical Oncology·H H BackusG J Peters

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