The use of AFP and DCP as serum biomarkers to differentiate between hepatocellular carcinoma and intrahepatic cholangiocarcinoma in non-cirrhotic livers.

e15162 Background: Differential diagnosis of hepatocellular carcinoma (HCC) and intrahepatic cholangiocarcinoma (ICC) can be challenging in patients without evidence of liver cirrhosis. Definitive diagnosis is based on tissue biopsy. We investigated if the use of serum biomarkers could help differentiate between these two types of malignancies, thereby avoiding the risks associated with biopsy. Methods: Patients with cholangiocarcinoma and HCC were recruited from Queen Elizabeth Hospital, Birmingham, UK; blood samples were collected at time of diagnosis. Two biomarkers, alpha-fetoprotein (AFP) and des-gamma-carboxy prothrombin (DCP) were measured in the serum samples from 56 patients with cholangiocarcinoma and 35 patients with HCC without evidence of liver cirrhosis. Of the 56 patients with cholangiocarcinoma, 17 were intrahepatic and 39 were extrahepatic. Results: 17 ICC and 35 HCC were included in the analysis. The levels of AFP and DCP were much higher in HCC as compared to ICC. The median AFP was 64.6 (IQR 10.9, 3564.2) in HCC as compared to 3 (IQR 2.4, 3.9) in ICC. Similarly, the median DCP was 215.41 (IQR 22.46, 692.53) in HCC as compared to 0.33 (IQR 0.16, 1.08) in ICC. Stepwise logistic regression was performed using both biomarkers. Log- DCP remained significant at 95% level in predicting HCC from ICC, giving an AUC of 0.96. Conclusions: In patients with a non-cirrhotic liver and radiological evidence of cancer, measurement of serum AFP and DCP level may help differentiate between HCC and ICC. In this study, DCP is the most useful discriminator between HCC and ICC. Further prospective studies should be done with larger sample sizes to validate the use of AFP and DCP as diagnostic biomarkers in this clinical setting.