Abstract
At our health care center, we have performed colorectal cancer screening through fecal occult blood testing for the purpose of health evaluation and promotion. We clarified the features of invasive colorectal cancer related to screening, and evaluated the problem of fecal occult blood testing. The subjects were 115 cases (male: 81, female: 34; average age: 58.1 years) with invasive cancer discovered through fecal occult blood testing. Thirty-eight subjects (33.0%) underwent screening for the first time, 16 subjects (13.9%) had undergone a screening two years or more previously, and 61 subjects (53.0%) had undergone screening every year. Of the subjects who had undergone screening every year, 37 had a negative fecal occult blood test result during the past two years and 24 cases had one or several positive fecal occult blood test results during the past two years. Three subjects with colorectal cancer invading into the SE underwent screening every year, and their assay values in the last two years were much lower than our cut-off value. It is suggested that some individuals use an incorrect method of fecal sampling. Therefore, we should make an effort to increase the follow-up rate of screening abnormalities first of all, and show the correct method of fecal sampling to all individuals who undergo colorectal cancer screening.
