支气管肺癌的发病率有日益急剧上升现象,在有生命统计的一些国家,肺癌发病率在工业发达国家都有明显上升,在美国,英国,西德等32个国家的肺癌死亡率在男性占全部恶性肿瘤中的首位,在上述这些国家中肺癌死亡人数在20年间即增加五倍,而同期其他癌瘤死亡人数仅增加80％,美国从四十年代起至七十年代,男性肺癌死亡率提高18倍在我国,既 The incidence of bronchial lung cancer has been increasing rapidly. In some countries with vital statistics, the incidence of lung cancer has risen significantly in industrialized countries. Lung cancer mortality rates in 32 countries including the United States, the United Kingdom, and West Germany account for all In the first place among malignant tumors, the number of lung cancer deaths in these countries has increased five-fold during the 20 years, while the deaths of other cancerous tumors have only increased by 80% in the same period. In the United States from the 1940s to the 1970s, the mortality rate of male lung cancer increased. 18 times in our country, both