20世纪末,肺癌已经逐渐成为癌症致死的首要原因,成为严重威胁人类健康的恶性肿瘤中的一员。有大量的研究报告显示,在大部分国家,肺癌所导致的发病人数和死亡人数仍然呈逐年上升的趋势。而在我国由于多种原因的共同作用:我国人口的持续飞速增长、人口老龄化问题的加剧、我国农村城市化和城镇的工业化进程的推进和人类对生活环境的破坏、污染等,已经使肺癌成为自20世纪70年代以来增幅最快的常见肿瘤之一,从而 At the end of the 20th century, lung cancer has gradually become the leading cause of cancer death, becoming a serious threat to human health, one of the malignant tumors. A large number of studies have shown that in most countries, the incidence of lung cancer and the number of deaths are still increasing year by year. However, in our country, due to the combined action of many reasons, the continuous and rapid population growth in our country, the aggravating problem of population aging, the promotion of rural urbanization in our country and the progress of industrialization in cities and towns, and the destruction of human living environment and pollution, lung cancer Become one of the most common tumors since the 1970s, thus