AFP and cirrhosis of liver: No publication bias was confirmed to exist in gender (p = 0.074), age (p = 0.474), liver cirrhosis (p = 0.548), HBsAg (p = 0.592), number of tumors (p = 0.296), size of tumors (p = 0.466), TNM stage (p = 0.266), AFP (p = 0.806), OS (p = 0.602), vascular invasion (p = 0.133), histological grade (p = 0.348).