Not all malignant tumors metastasize. But metastasis is the final stage of many malignant tumors. For example, many malignant tumors will have brain metastasis, brain metastasis means that the malignant tumor has entered the advanced stage, brain metastasis in men is mostly seen in lung cancer, and in women is mostly seen in breast cancer and lung cancer, theoretically all malignant tumors may be metastasized to the brain, so brain metastasis is usually a manifestation of the disease’s advanced stage, and the patient’s survival is mainly due to the metastatic foci of other parts of the body department to decide. Whether brain metastases cause cerebral death depends on the number and size of the metastases and their key location. If it is an isolated metastasis in some unimportant parts, if the growth is slow, the patient can actually maintain for many years, if it occurs in the critical parts, such as like medulla oblongata, brainstem or very widely attached to the brain, cerebellum, brainstem, which will cause some problems such as cranial hypertension, hydrocephalus, etc., the survival of such a patient may be shorter, therefore there is no average value to determine how many years of brain metastasis, and it depends on the individual’s situation to be observed. Therefore, there is no average value to determine the number of years for brain metastases, and it is based on each individual’s situation.