FGF-19 is a member of the fibroblast growth factor (FGF) family. After being secreted from the intestine, FGF19 can enter the liver with the circulation and bind to FGFR4 in the liver to act. It has a hormone-like effect and plays an important role in metabolic regulation, such as regulating bile acid metabolism, regulating gallbladder filling, and improving blood glucose. Notably, aberrant expression of FGF19/FGFR4 promotes HCC development and metastasis.