Abstract
Large scale personal individualized colorectal cancer screening was undertaken in Omiya City from 1993 to 2000 and as a result 165 cases were found to have advanced cancers. The examinees count 67, 684 in total, the male to female ratio being 1:2. Of the 165 cancer cases, 88 were male and 77 were female, not indicating as much sex-related difference as in cases of early cancer. From this analysis the following tendencies and facts are noteworthy. [Age of Examinees] In view of the positive predicting value of the initial screening, effectiveness of the screening undertaken was considered high enough for the males above 55 years and for the females above 50 years. The effectiveness was questionable for the females below 49 years. [Inter-screening Interval] As far as advanced cancer is concerned, in 82.2% of the screening for colorectal cancer repeaters, it was detected within 2 years of the first screening, that is either by annual screening in males above 55 years and in females above 50 years, or even by alternative year screening for the younger age without many failures of detection. [Points of Note] Regardless the number of the experienced screening for colorectal cancer, in as many cases as 146 or 88.5% of all, cancer was detected by the first experienced screening. Furthermore, in 119 cases or 72.1% of all, the fecal hemoglobin level was above 1000ng/ml. Therefore, those examinees in such categories as mentioned herewith should be aware of their higher cancer predicting likelihood.
