The survival period after cancer metastasis is relatively short, usually around 1-3 years. It depends on the patient’s physical condition, the specific pathological nature of the cancer and the treatment method. Tumors such as breast cancer, lung cancer and colorectal cancer have good prognosis, and even if metastasis occurs, they can still achieve different survival periods through active treatment. In contrast, tumors such as primary liver cancer and pancreatic cancer have very high malignancy and the survival period is significantly shorter after metastasis occurs, often around six months to a year. All treatments are worse in advanced cancer than early cancer, so cancer treatment emphasizes early diagnosis, early detection and early treatment, and the more advanced the cancer is, the worse the prognosis is, and the survival period after metastasis occurs is about 1-3 years.