癌症是危害世界人民健康的一大祸害,每年新发病例估计为635万,其中中国为100万。发达国家主要肿瘤:肺、直/结肠、乳腺、胃和前列腺;发展中国家主要肿瘤:胃、食管、宫颈、肝和肺。世界卫生组织当前一项重要工作是协助各成员国制定肿瘤防治规划,搞好肿瘤防治工作。首先是制定2000年控制肿瘤死亡率目标,美国要求下降25～50％;欧洲地 Cancer is a scourge that affects the health of the people of the world. The estimated number of new cases each year is 6.35 million, of which China is 1 million. Main tumors in developed countries: lung, straight/colon, breast, stomach, and prostate; main tumors in developing countries: stomach, esophagus, cervix, liver, and lung. The current important work of the World Health Organization is to assist member states in the formulation of cancer prevention plans and do a good job of cancer prevention and control. The first is the establishment of a target for the control of cancer mortality in 2000. The United States requires a 25 to 50% reduction; Europe