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肺癌是全球最常见的恶性肿瘤之一,其发病率和死亡率目前呈上升趋势。非小细胞肺癌(non small cell lung cancer,NSCLC)占肺癌的75%～80%,而ⅢA(N2)期约占所有NSCLC患者的20%。在TNM分期系统中,N是指淋巴结转移情况。NSCLC的N2期是指肿瘤转移至同侧纵隔及隆突下的淋巴结
Lung cancer is one of the most common malignancies in the world and its morbidity and mortality are currently on the rise. Non-small cell lung cancer (NSCLC) accounts for 75% to 80% of lung cancers, while stage IIIA (N2) accounts for about 20% of all NSCLC patients. In the TNM staging system, N refers to lymph node metastases. The N2 stage of NSCLC refers to the metastasis of the tumor to the lymph nodes on the ipsilateral mediastinum and under the carina