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现有传说,约有90%的恶性肿瘤是由于环境因素所引起,因而可加以预防。这是由于人们对国与国之间癌发病率存在着差异,以及移居后人群中癌的类型和发生率发生改变提高了认识的原故。食管癌在伊朗比尼日利亚高300倍;胃癌在日本比乌干达高25倍;子宫颈癌在哥伦比亚比以色列高15倍。尽管发病率有这样大的差异,但移居到他国以后的人群即迅速丧失
According to the existing legend, about 90% of malignant tumors are caused by environmental factors and can be prevented. This is due to people’s differences in the incidence of cancer between countries, as well as the fact that the type and incidence of cancer in the population after immigrants have changed to increase understanding. Esophageal cancer is 300 times higher in Nigeria than in Nigeria; stomach cancer is 25 times higher in Japan than in Uganda; cervical cancer is 15 times higher in Colombia than in Israel. Despite such a large difference in incidence, people who have migrated to other countries are quickly lost