肺癌是发病率及病死率较高的恶性肿瘤之一 ,5年存活率为 13 9% [1] ,主要是由于肺癌早期发现困难 ,以及晚期病例又很难治愈等综合原因所致。据Ｌａｎｄｉｓ等[2 ] 报道 ,美国每年新发现肺癌及因肺癌而死亡的人数分别为 17 15万和16 0 0万 ,特别是女性肺癌的发病率及病死率正在 Lung cancer is one of the malignant tumors with a high morbidity and mortality. The 5-year survival rate is 13 9% [1]. It is mainly due to the early detection of lung cancer and the comprehensive reasons that it is difficult to cure in advanced cases. According to Landis et al. [2], the number of newly discovered lung cancer and lung cancer deaths in the United States is 17.1 million and 16 million respectively each year. The incidence and mortality of lung cancer in women in particular are being