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. 1985 Nov;52(5):687–693. doi: 10.1038/bjc.1985.244

Immunohistochemical detection of the ras oncogene p21 product in an experimental tumour and in human colorectal neoplasms.

A R Williams, J Piris, D A Spandidos, A H Wyllie
PMCID: PMC1977224  PMID: 3904801

Abstract

The monoclonal antibody Y13 259 to the ras oncogene protein product p21 was used in an immunohistochemical study of ras expression in human colorectal neoplasms. The ability of the antibody to detect enhanced levels of ras expression was confirmed by its use with an experimental neoplasm known to express ras at high levels. Human colonic adenocarcinomas in general showed a similar staining intensity to that seen in normal mucosa. Adenomas however showed consistently high p21 expression as indicated by staining intensity. This suggests that elevated ras expression may be important in the development of adenomas, but that high levels need not be sustained in the conversion to invasive carcinoma.

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