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      K-ras mutations and HLA-DR expression in large bowel adenomas.

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          Abstract

          A total of 72 sporadic colorectal adenomas in 56 patients were studied for the presence of point mutations in codons 12 and 13 of the K-ras gene and for HLA-DR antigen expression related to clinicopathological variables. Forty K-ras mutations in 39 adenomas were found (54%): 31 (77%) in codon 12 and nine (23%) in codon 13. There was a strong relationship between the incidence of K-ras mutations and adenoma type, degree of dysplasia and sex. The highest frequency of K-ras mutations was seen in large adenomas of the villous type with high-grade dysplasia. Fourteen out of 15 adenomas obtained from 14 women above 65 years of age carried mutations. HLA-DR positivity was found in 38% of the adenomas, large tumours and those with high-grade dysplasia having the strongest staining. Coexpression of K-ras mutations and HLA-DR was found significantly more frequently in large and highly dysplastic adenomas, although two-way analysis of variance showing size and grade of dysplasia to be the most important variable. None of the adenomas with low-grade dysplasia showed both K-ras mutation and HLA-DR positivity (P = 0.004). K-ras mutation is recognised as an early event in colorectal carcinogenesis. The mutation might give rise to peptides that may be presented on the tumour cell surface by class II molecules, and thereby induce immune responses against neoplastic cells.

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          Author and article information

          Journal
          Br J Cancer
          British Journal of Cancer
          Nature Publishing Group
          0007-0920
          1532-1827
          July 1996
          : 74
          : 1
          : 99-108
          Affiliations
          Institute of Forensic Medicine, National Hospital, University of Oslo, Norway.
          Article
          2074621
          8679466
          8c96aefa-02c9-40a9-9e9d-cb1344e63588
          History
          Categories
          Research Article

          Oncology & Radiotherapy
          Oncology & Radiotherapy

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