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据美国抗癌学会估计1973年美国有76,000人患结肠直肠癌。1968年本病的病死率仅次于心脏病。1972年估计死于本病的美国人为47,000人。一、病因本病在美国、英国、加拿大、比利时等发病率高,智利、日本等则较低,经分析似与地理或遗传因素无关,可能因饮食习惯直接或间接影响肠道的细菌及生化过程,如日本人食管及胃癌发生率特别高,当移居美国接受美国生活习惯数代后,下消化道癌的发病率就比胃和食管癌的发病率高许多。有人认为北美洲人食物中缺乏
According to the American Society of Anti-Cancer Research, it was estimated that 76,000 people in the United States had colorectal cancer in 1973. In 1968, the mortality of this disease was second only to heart disease. In 1972, an estimated 47,000 Americans died of the disease. First, the cause of the disease in the United States, Britain, Canada, Belgium and other high incidence, Chile, Japan and other low, the analysis seems to be irrespective of geographical or genetic factors, may be due to dietary habits directly or indirectly affect the intestinal bacteria and biochemistry The process, such as the high incidence of esophageal and gastric cancer in the Japanese, is associated with a lower prevalence of lower gastrointestinal cancer than gastric and esophageal cancer when emigrating to the United States for several generations of American habits. Some people think that North Americans lack food