[in Japanese]

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The purpose of this study is to clarify the ongoing rate of thorough examinations further needed after gastric mass survey has been conducted through indirect gastrofluororadiography, and to acquire some idea on how far the rate of thorough examinations can possibly be decreased. We theorized an appropriate rate of required thorough examinations by analyzing the current status of false positive cases, with emphasis on those cases found in particular areas where high-accuracy thorough examinations were undertaken.
In our study, we have defined as false positive cases those cases of “ no abnormal finding” or “ chronic gastritis without local lesions”, as diagnosed at the end of the thorough examination. During the past 10 years, the rate of false positive cases derived from the gastric mass survey in Kagoshima prefecture, Japan, has remained almost constant. Thus, we looked mainly into the results of 8,820 cases mass-surveyed in 2000.
If only malignant tumor cases are taken into consideration, the rate is 0.12%, whereas if both the malignant tumor cases and the cases in which certain therapy was required are taken into consideration, the rate rises to 0.92%. Provided all the false positive cases are excluded, the rate becomes 5.49%. Therefore, the rate we can consider appropriate lies somewhere between 0.92% and 5.49%. On the other hand, the rate requiring biopsy through endoscopic screening is 10.9%. Thus, we consider that the rate of 5.49% is admissible.
Henceforth, provided that the capability of reading and characterizing X-ray images can be improved further, we will certainly be able to decrease the rate of secondary thorough examinations further needed after the primary mass survey.

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The efficient screening for colon cancer, especially for those deeper than sm tumor, was studied in 1017 cases of invasive carcinomas found among the 31, 070 patients who had undergone the initial screening test for colon cancer using TCS in our center from 1992 through 1998. The results are as follows.(i) In order to detect colon cancer efficiently, screening is recommended for all individuals beginning at the ages of 40 years for men and 30 years for women.(ii) Performing only a single TCS screening yields quite satisfactory results.(iii) When m tumor or adenoma is detected at the first screening, male patients should undergo a second screening in three years; the efficient time of the second screening for women cannot be determined.(iv) When a neoplastic region is not detected at the first screening, the second screening can wait until 5 years later for both men and women.(v) A third screening may not be necessary for the present for both men and women.

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[in Japanese]

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