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

被引:29
作者
Andersen, SN
Breivik, J
Lovig, T
Meling, GI
Gaudernack, G
Clausen, OPF
Schjolberg, A
Fausa, O
Langmark, F
Lund, E
Rognum, TO
机构
[1] NORWEGIAN RADIUM HOSP, INST CANC RES, DEPT IMMUNOL, N-0310 OSLO, NORWAY
[2] DIAKONHJEMMET HOSP OSLO, DEPT SURG, N-0319 OSLO, NORWAY
[3] UNIV OSLO, NATL HOSP, DEPT MED A, N-0027 OSLO, NORWAY
[4] UNIV OSLO, NATL HOSP, INST PATHOL, N-0027 OSLO, NORWAY
[5] UNIV TROMSO, INST MED CHEM, N-9001 TROMSO, NORWAY
[6] CANC REGISTRY NORWAY, N-0369 OSLO, NORWAY
关键词
K-ras; HLA-DR; large bowel adenoma; dysplasia; polymerase chain reaction-restriction fragment length polymorphism; immunohistochemistry;
D O I
10.1038/bjc.1996.322
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
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 rumours 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.
引用
收藏
页码:99 / 108
页数:10
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