AFP and cirrhosis of liver: The positive rate of AFP was more than 50% for HCC patients in each set, while it was 24.8% and 27.1% respectively for patients with liver cirrhosis and chronic hepatitis B. The distributions of the TNM stage and individuals with AFP‐positive of each HCC group in training set and validation set were compared by Pearson's chi‐squared test, and no statistical significance was found.