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第二次世界大战以来,日本大肠癌的发病有逐年增加的趋势。回顾1955年是当时发病最低的国家,在国内癌死亡率较低,到1978年大肠癌已占癌死亡的第三位。根据全国年龄订正死亡率的统计:1950年结肠癌1.7,直肠癌2.8,到1978年各增高为3.8、3.8,并且男女发病均有明显增高,尤以女性为甚,与1968年比较,男增高3.1倍,女增高3.6倍。由历史资料可以预计大肠癌的发病将明显增加,推测到2000年
Since the Second World War, the incidence of colorectal cancer in Japan has increased year by year. Recalling that 1955 was the country with the lowest incidence at that time, cancer mortality was low in the country, and by 1978, colorectal cancer had taken the third place in cancer deaths. According to statistics on national age-adjusted death rates: colon cancer 1.7, rectal cancer 2.8 in 1950, increased to 3.8 and 3.8 in 1978, and the incidence of both men and women has increased significantly, especially in women, and compared with 1968, the increase in men 3.1 times, women increased 3.6 times. From historical data, it is expected that the incidence of colorectal cancer will increase significantly.