The cost of treatment for brain metastases from lung cancer varies somewhat depending on the treatment modality. Similar to oligometastatic cancer, that is, 1-2 isolated lesions can be considered for surgery. The cost of brain metastasis surgery in neurosurgery is about $30,000-$40,000, which varies slightly from one hospital to another at different levels. If the most conventional and mainstream radiotherapy is used, there is also a difference in cost with different radiotherapy machines. For example, the cost of the most common two-field whole brain radiotherapy should be less than 10,000 RMB, but few hospitals use this technology. At present, the most mainstream is the 3D conformal or intensity modulated conformal radiotherapy, which is about 30,000 RMB for one treatment. There are also higher-end radiotherapy equipment, such as proton therapy, which costs about 200,000 yuan for a course of treatment, which varies greatly. In addition, there is also drug treatment, oral chemotherapy drug temozolomide can treat brain metastases, its 1 course of treatment is about 8,000 yuan, medical insurance can reimburse part of the treatment, to do 5-6 courses. There are also drugs for sensitive driver mutations, which are available from several thousand dollars to tens of thousands of dollars, so it is important to be clear about which treatment is ultimately used to summarize and assess the cost.