Predictive value of protein induced by absence of vitamin K absence or antagonist II, alpha-fetoprotein and gamma-glutamyltransferase/aspartate aminotransferase ratio for the diagnosis of hepatocellular carcinoma in transplantation candidates.

Abstract

Alpha-fetoprotein (AFP) and protein induced by vitamin K absence or antagonist-II (PIVKA-II) are used as tumour markers for the diagnosis of hepatocellular carcinoma (HCC). We investigate whether combined liver function marker such as gamma-glutamyl transferase (GGT) and aspartate aminotransferase (AST) with alpha-fetoprotein (AFP) and PIVKA-II increase their diagnostic predictive value in diagnosis of HCC. The serum levels of PIVKA-II, AFP and GGT/AST ratio were analysed in 112 transplant candidates. Of these patients, 66 (59%) had HCC and 46 (41%) patients did not. Histological grade was positively correlated with serum levels of PIVKA-II and AFP (r = 0.255, P < 0.039 and r = 0.284, P < 0.021, respectively) and only tumour size positively correlated with the serum level of PIVKA-II (r = 0.270, P < 0.028), but no correlation between the number of tumour, Milan criteria and PIVKA-II (r = -0.002, P = 0.984 and r = 0.154, P = 0.216, respectively) with AFP (r = -0.024, P = 0.851 and r = 0.080, P = 0.522, respectively). Sensitivity and specificity of AFP, PIVKA-II and GGT/AST ratio at cutoff values of 6.08, 2.63 and 0.89, respectively, were as follows: 77, 77 vs 71, 83 vs 60 and 53%. The combination of AFP and PIVKA-II and GGT/AST ratio in HCC diagnosis increased AUROC values as follows; 0.860 vs 0.882 and 0.823 vs 0.840, respectively. This study showed that combined tumour markers such as AFP, PIVKA-II and GGT/AST ratio increase their sensitivity in HCC diagnosis.