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肺癌是当前世界上最常见的恶性肿瘤之一,在我国上海等大城市居肿瘤发病率和病死率的首位。在美国每年约有15万新病例出现。确诊后90％患者在5年内死亡。尽管应用了先进的诊断技术和治疗措施,但其疗效近数10年来无明显提高,其原因为:①肺癌的生物学特性复杂,恶性程度高;②绝大多数患者前来就诊时已是晚期。据统计,目前70％的肺癌患者就诊时已是中晚期,因而失去了手术机会,而早期发现可使5年生存率提高到80％左右,因而肺癌的早期诊断至关重要,
Lung cancer is one of the most common malignant tumors in the world. It ranks first in cancer incidence and mortality in major cities such as Shanghai. About 150,000 new cases appear each year in the United States. After diagnosis, 90% of patients died within 5 years. Although advanced diagnostic techniques and therapeutic measures have been applied, its efficacy has not improved significantly in the recent 10 years. The reasons are: 1 The biological characteristics of lung cancer are complex and the degree of malignancy is high; 2 The vast majority of patients are advanced at the time of treatment. . According to statistics, at present, 70% of lung cancer patients are in the middle and late stage when they visit the hospital, and they lose their chances of surgery. Early detection can increase the 5-year survival rate to about 80%. Therefore, early diagnosis of lung cancer is very important.