Liver cancer is a malignant tumor of the liver, which can be divided into primary and secondary types. Primary malignant tumor of liver originated from epithelial or mesenchymal tissue of liver. The former is called primary liver cancer, which is a malignant tumor with high incidence and great harm in China. The latter is called sarcoma, which is rare compared with primary liver cancer.
Secondary or metastatic liver cancer refers to a malignant tumor that originated from multiple organs of the whole body and invaded the liver. Generally, it is more common in liver metastasis of malignant tumors in stomach, biliary tract, pancreas, colorectal cancer, ovary, uterus, lung, breast and other organs.
The etiology and exact molecular mechanism of primary liver cancer are not completely clear. At present, it is considered that its onset is a multi-factor and multi-step complex process, which is not only affected by the environment, but also. Epidemiological and experimental data show that,
Hepatitis B virus (HBV) and hepatitis C virus (HCV) infection, aflatoxin, drinking water pollution, alcohol, liver cirrhosis, sex hormones, nitrosamines and trace elements are all related to the pathogenesis of liver cancer. Secondary liver cancer (metastatic liver cancer) can form diseases through different ways, such as blood and lymph metastasis or direct invasion of the liver.