肺癌是全世界范围内病死率最高的恶性肿瘤。在西方发达国家,随着禁烟政策的实施及大气环境的改善,其发病率正逐年下降。根据美国2017年发布的流行病学数据,其在男性及女性的恶性肿瘤的发病中均位居次席~[1]。我国肺癌的发病率还在逐年升高,目前发病率仍位居各大恶性肿瘤之首位。目前,对于肺癌 Lung cancer is the most malignant tumor in the world. In the western developed countries, the incidence is declining year by year with the implementation of a no-smoking policy and the improvement of the atmospheric environment. According to the epidemiological data released by the United States in 2017, it ranks second in the incidence of malignant tumors in both men and women. [1] The incidence of lung cancer in China is still rising year by year, the current incidence is still ranked first in major malignant tumors. At present, for lung cancer