肺癌是当今各国最常见的恶性肿瘤之一,其发病率和死亡率呈逐年上升趋势,已居癌症死亡原因首位。Spira报道2004年内估计在美国约有173 700例被确诊为肺癌,约164 440例死于肺癌。脑转移是肺癌最常见的并发症,其发病率随着肺癌发病率的增加明显上升,约20%~50%的肺癌患者伴有脑转移 Lung cancer is one of the most common malignant tumors in various countries today. Its morbidity and mortality have been increasing year by year, ranking the first place in the cause of cancer death. Spira reports that in 2004, an estimated 173 700 lung cancer cases were diagnosed in the United States and 164 440 cases died of lung cancer in the United States. Brain metastasis is the most common complication of lung cancer, the incidence of lung cancer increased significantly with the incidence of lung cancer, about 20% to 50% of lung cancer patients with brain metastasis