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癌症即恶性肿瘤,是一种严重威胁广大人民健康的常见病。目前在各种死亡原因的统计中,癌症死亡占第一位或第二位,在成人的各种死亡中甚至占三分之一左右。近年来癌症的发病率和死亡率在世界各国呈现出逐渐升高的趋势。尤其是肺癌的上升最为明显,如美国1969年死于肺癌者有5.9万人,死亡率较35年前增加15倍。我国上海市1971年的肺癌发病率比1963年增加一倍多。肿瘤的病因与发病机理是个很复杂的问题,迄今尚未完全阐明。人们在长期的
Cancer, which is a malignant tumor, is a common disease that seriously threatens the health of the general public. At present, in the statistics of various causes of death, cancer deaths account for the first or second place, and they account for about one-third of all adult deaths. In recent years, the morbidity and mortality of cancer have gradually increased in countries around the world. In particular, the increase in lung cancer is most noticeable. For example, in the United States, 5.9 million people died of lung cancer in 1969, and the death rate is 15 times higher than it was 35 years ago. The incidence of lung cancer in Shanghai, China, in 1971 more than doubled in 1963. The etiology and pathogenesis of tumors are complex issues that have not yet been fully elucidated. People in the long term