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Expression of ras Oncogene Product (p-21) and Point Mutation of Ki-ras Codon 12 in Superficial Early Colorectal Cancer Takahiro Fujimori 1 1The Second Department of Pathology, Kobe University School of Medicine Keyword: 表面型早期大腸癌 , ras遺伝子 , 免疫染色 , PCR , 点突然変異 pp.111-117
Published Date 1992/1/25
DOI https://doi.org/10.11477/mf.1403106700

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  • Abstract
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 To evaluate the specificity of carcinogenesis of superficial cancer in comparison with cancer arising from the adenoma-carcinoma sequence, we conducted immunohistochemical study on ras oncogene product and the point mutations in codon 12 of the Ki-ras gene in superficial cancer. It is already confirmed that the activation of ras gene is involved in initial stage of carcinogenesis of adenoma-carcinoma sequence.

 Results was as follows: (1) Immunohistochemical staining showed an expression of ras gene product in 40% of the cases with adenoma, 60% of the cases with early cancer of non-superficial type, and 44% of the cases with advanced cancer. No positive reaction was seen in any cases of well differentiated flat depressed subtype of superficial type. (2) Cases of Type ⅡA including adenoma displayed reactions almost similar to those of the cases with non-superficial type (60%). Reaction was also positive in 20% of the cases with Type ⅡA which did not included adenoma. (3) The proportions of point mutation in codon 12 of the K-ras gene were 19%, 44%, 36%, 25% in adenoma, Type Ⅰ cancer, advanced cancer, and Type ⅡA cancer, respectively. No point mutations occurred in Type ⅡB cancer or normal large bowel tissue obtained from colorectal cancer patients.

 To evaluate the specificity of the development process of superficial type carcinoma, the point mutation in codon 12 of Ki-ras gene and immunohistochemical staining of ras gene product were investigated. It was indicated that there exists process different from carcinogenesis of adenoma-carcinoma sequence in superficial colorectal cancer (Type ⅡB).


Copyright © 1992, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1219 印刷版ISSN 0536-2180 医学書院

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