In the past, when these new drugs were not available, brain metastases from lung cancer also relied on chemotherapy, the efficiency of which was less than 20%, and in fact, the role of chemotherapy was minimal. Brain metastases from lung cancer, whether in the past or now, the role of radiotherapy is still more important, some new targeted drugs have a history of nearly 15 years, and there are relatively more treatment methods for brain metastases from patients with genetic mutations. If a patient with relatively small lesions has a genetic mutation, it is very simple to give him targeted drugs and take them home orally. I am talking about non-small cell lung cancer, small cell lung cancer currently does not have targeted drugs, or mainly rely on radiotherapy, in the past, patients with brain metastases do not live more than six months, but now patients with brain metastases even live four to five years, so now very optimistic that, especially non-small cell lung cancer, we have called it a chronic disease, in fact, the development of cancer treatment is very good, for patients, also increased very much hope. hope.