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[The risk of colorectal adenomatous polyp in relation to serum total cholesterol levels in Japanese men classified by age group].

In order to investigate the relationship between the risk of colorectal cancer and serum total cholesterol (TC) levels, we studied the relationship between the risk of colorectal adenomatous polyp and high TC levels in Japanese men aged from 40 to 59 at a manufacturing company. We first diagnosed 283 subjects as having adenomatous polyp (AD) or normal (C), identified by means of an immunological fecal occult blood detection test and total colonofiberscopic examination (TCF), and then selected 94 subjects after excluding the patients with diseases possibly influencing TC. We classified the subjects into two age groups (40-49 and 50-59) and conducted a statistical analysis of AD and C groups by means of a two tailed t-test. The mean values for TC (DTC), which had been obtained within 3 months before TCF, were significantly different (p < 0.001 95% CI 15.79-48.49) for those in their 40s, but were not different for those in their 50s. In order to check the stability of the data, we analyzed the mean values for DTC and BTC, which had been obtained within 15 months. The results showed the same trend for those in their 40s (p = 0.001 95% CI 10.76-40.87). The mean DTC and BTC values were again not significantly different for those in their 50s. We further divided the subjects into the lower (-181 mg/dl) and higher (209 mg/dl-) DTC values and conducted further statistical analysis with Fisher's exact test. The results were significant in the 40-49 age group (p = 0.004), in the odds ratio (13.75 95% CI 2.32-81.49), but showed no significant difference in the 50-59 age group. The mean LDL-cholesterol values within 3 months before TCF were significantly different in the 40-49 age group (p < 0.001 95% CI 15.22-47.70) and were not different in the 50-59 age group. There was no statistical difference in the mean values for HDL-cholesterol, triglyceride and body mass index in either age group. From these results, it can be concluded that the risk of colorectal adenomatous polyp was associated with a higher serum total cholesterol level in the 40s, and seemed to indicate a close relationship with the risk of colorectal cancer.