1.What is portal vein cancer thrombosis? During the process of liver cancer development or metastasis, it is easy to invade the portal vein, i.e. form portal vein cancer embolism. The incidence of portal vein cancer embolism is high and harmful, and it will soon produce large amount of ascites, gastrointestinal bleeding and liver failure, which is an important factor affecting the prognosis of patients. 2.Why should we carry out multidisciplinary joint clinic? Portal vein cancer embolism is a difficult problem in the treatment of liver cancer, and there are not many treatment methods and they are not standardized. The development of multidisciplinary joint clinic can maximize the academic and professional advantages of our hospital, which is conducive to the standardized, multidisciplinary and comprehensive diagnosis and treatment of portal vein cancer embolism and avoid inappropriate treatment or excessive treatment of patients.