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目前,癌症是世界上绝大部分地区的主要死亡原因。因国家的不同,死亡率最高的癌症亦各异。何以某些癌症在一定的地区内比较流行,尚不完全清楚。最近在国际范围内进行了癌症流行情况的调查,以期找到更好的控制办法。
At present, cancer is the leading cause of death in most parts of the world. Cancers with the highest mortality rates vary from country to country. It is not entirely clear why certain cancers are more prevalent in certain regions. A survey of cancer epidemics was recently conducted internationally with a view to finding better ways to control it.