当今，肺癌的发病率和死亡率在中国和全世界大多数城市和国家有增无减。WHO公布每年有60万肺癌新发病例，预计到2000年可达100万。美国女性肺癌死亡率继续超过乳腺癌，日本肺癌死亡率已超过胃癌居第一位。上海市每年有3500例肺癌新发病例，居恶性肿瘤之首；中国预防医学科学院 Today, the incidence and mortality of lung cancer are increasing in most cities and countries in China and the world. The WHO has announced that there are 600,000 new cases of lung cancer each year, and it is expected to reach 1 million by the year 2000. The mortality rate of female lung cancer in the United States continues to exceed that of breast cancer. The death rate of lung cancer in Japan has surpassed that of gastric cancer. There are 3,500 new cases of lung cancer every year in Shanghai, ranking the first among malignant tumors; China Academy of Preventive Medicine