In contrast to AFP, CA19-9 levels ≤ 37 U/mL were significantly associated with higher values of alanine aminotransferase (ALT), AST, serum albumin, Child–Pugh score, and total bilirubin (TBil), as well as with positive hepatitis B surface antigen (HBsAg) and liver cirrhosis (Table 1). Here, GPT is linked to cirrhosis of liver.