肺癌发病率及死亡率已列为各种癌症的首位,并且还在呈上升趋势。肺癌病人出现症状前来就诊的5年生存率低于30%。以美国康奈尔大学威尔医学院发起的、有全世界7个国家38个医疗研究机构参加的国际早期肺癌行动计划(简称I-ELCAP),通过汇集世界各地肺癌CT普查的资料、研究早期肺 Lung cancer incidence and mortality have been ranked first in various cancers and are still on the rise. The five-year survival rate of patients with lung cancer before the onset of symptoms is less than 30%. The International Early Stage Lung Cancer Action Plan (I-ELCAP), initiated by Weill Medical College of Cornell University and attended by 38 medical research institutes from 7 countries around the world, gathers data from CT census of lung cancer around the world and studies early lung