Lung cancer metastasis to the liver is stage IV, which is the most advanced stage in TNM staging. Lung cancer, including other solid tumors, is the most advanced stage, or stage IV, if metastasis to distant organs occurs. The chance of lung cancer metastasis to liver is high, and if it occurs, it is also a factor of poor prognosis in lung cancer. Moreover, lung cancer cells metastasizing to liver grow vigorously and proliferate rapidly, so it is recommended to treat it actively and control it within a certain range before the tumor forms a huge mass and cancer embolism, so that lung cancer patients can have a chance to obtain long-term survival.