肺癌是目前最常见的恶性肿瘤之一,其发病率正呈逐年上升的趋势,已经成为目前人类癌症死亡的主要原因之一。脑转移是肺癌常见的转移部位之一,严重危及患者的生命,据报道小细胞肺癌诊断时20%发生脑转移,非小细胞肺癌诊断时30%发生脑转移,尸检中80%有脑转移。研究[1]表明,如不予治 Lung cancer is one of the most common malignant tumors at present, and its incidence is increasing year by year. It has become one of the major causes of death of human cancer. Brain metastasis is one of the common metastatic sites of lung cancer, seriously endangering patients’ life. Brain metastasis is reported in 20% of small cell lung cancer diagnoses, brain metastases in 30% of non-small cell lung cancer diagnoses, and brain metastases in 80% of autopsy cases. Study [1] shows that if not treated