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- W9458506 abstract "The mechanism of the development of cancer in old age is not well understood in various cancers, especially colorectal cancer. Colorectal cancer in elderly patients often shows a high frequency of proximal colon cancer. Microsatellite instability cancers are often found in the proximal colon and show a lower incidence of p53 abnormality. While the aberrant expression of p53 is more frequent in the distal colon. To investigate the carcinogenesis of colorectal cancer in elderly patients, we studied the genetic background of these patients regarding microsatellite instability and the aberrant expression of p53.In the present study, we examined the clinicopathological features and the frequency of p53 abnormality in elderly patients compared to younger patients, and the frequency of microsatellite instability in elderly patients. In microsatellite instability cancer, immunoreactivity of hMSH2 and hMLH1 were also examined.Colorectal cancer in elderly patients is associated with proximal location of the cancer (p = 0.008). Microsatellite instability was observed in only 1 case (2.8%). The immunoreactivity of hMLH1 showed negative staining in malignant glands. The frequency of aberrant expression of p53 showed no significant difference between two groups.We found colorectal cancer more frequently in proximal colon in elderly patients than in younger patients, and microsatellite instability frequency in elderly patients (2.8%) was lower than reported microsatellite instability frequency in sporadic colorectal cancer patients. Moreover, the frequency of aberrant expression of p53 did not differ between the two groups. In the present study, microsatellite instability appeared to be less important for the carcinogenesis of colorectal cancer in elderly patients as compared to younger patients." @default.
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- W9458506 date "2003-12-31" @default.
- W9458506 modified "2023-10-16" @default.
- W9458506 title "Sporadic colorectal cancer in elderly people." @default.
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