The well-known risk factors of liver cancer include infection with hepatitis B virus (HBV), hepatitis C virus (HCV), alcoholic cirrhosis and smoking (Chen and Zhang, 2011). Because of the universal HBV vaccination, chemoprevention in selected population, and early detection in at-risk population (Chen and Zhang, 2011), the reduction of liver cancer incidence and mortality rate was observed in some countries worldwide (Li and He, 2021), including some areas of China in recent years but not Mongolia (Bai et al., 2018;Sun et al., 2018).