Diagnostic value of gamma‐glutamyl transpeptidase to alkaline phosphatase ratio combined with gamma‐glutamyl transpeptidase to aspartate aminotransferase ratio and alanine aminotransferase to aspartate aminotransferase ratio in alpha‐fetoprotein‐negative hepatocellular carcinoma. Here, GGTLC1 is linked to hepatocellular carcinoma.