According to the 2007 Nissho Cancer Screening Journal, the immunofecal occult blood test (IFOBT) commonly used in Japan has been established to be effective, but one of its drawbacks is that it cannot avoid false negatives. .. False negatives for 212 cases of colorectal cancer found in 177,887 people who underwent fecal occult blood tests at the Ishikawa Health Service Association Cancer Screening Center from 1998 to 2004 and were definitely diagnosed by colonoscopy and cytology. Of these 212 patients, false negatives (diagnosed as colorectal cancer despite a negative fecal occult blood test ) accounted for 36.3%, of which 25% had advanced cancer (high probability of death). One of the causes of false negatives is that there are many early-stage cancers such as type 0 when viewed with the naked eye, the maximum diameter of the found cancer is 2 cm or less, and the cancer is still in the mucosa. It turned out that there was. Of the false negative fecal occult blood tests, 50% of those diagnosed as advanced cancer were found in the right colon. It is thought that the reason why the fecal occult blood test becomes false negative is that the amount of bleeding is generally small in early stage cancer and that feces tend to stay in the right colon, and at that time, hemoglobin degenerates and deteriorates and the kit does not respond in the fecal occult blood test. For early-stage cancer diagnosed as colorectal cancer with a false negative fecal occult blood test, the rate of surgery such as endoscopic resection was high. Although such a paper has been published as above, I think this fecal occult blood test is a poorer quality test and only better than not done. As I showed last time, people over the age of 50 have a dramatically higher chance of getting cancer, so I think you should take a colonoscope at least once every two to three years. However, even more frighteningly, the number of Japanese who do not undergo a medical checkup once a year is said to be 36 million out of 100 million adult men and women in Japan. You can see the reasons why the average life expectancy of rich people is high and average life expectancy of the British royal family is over 90.
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