癌症不仅限于工业化国家,它已逐渐地被认为是一个世界性的问题。目前,在世界不同地区中所发生的癌症类型有相当大的不同。在发展中国家里,人们的年龄构成正在迅速的发生变化,这主要是由于感染性疾病的死亡率降低的结果。但大量采用西方生活方式也可能使癌症的发病率增加。这样就自 Cancer is not limited to industrialized countries, it has gradually been considered as a worldwide problem. Currently, there are considerable differences in the types of cancer that occur in different parts of the world. In developing countries, the age composition of people is rapidly changing, largely as a result of the reduced mortality rate from infectious diseases. However, extensive use of Western lifestyles may also increase the incidence of cancer. That’s it