Early Detection of Hepatocellular Carcinoma on top of Liver Cirrhosis: The Fas Receptor and Ligand System

Hepatocyte aberrations, accumulation of chromosomal damage and possibly initiation of hepatic carcinogenesis is thought to be caused by the continued viral replication and the persistent attempt by a less than optimal immune response to eliminate hepatitis C virus (HCV) infected cells. The identification of the "death factors" including Fas and its Ligand (Fas-L) as a major regulator of both apoptosis and immune function has provided insight into an attractive mechanism of tumor escape from immune clearance. Aim: To assess the hepatic expression of Fas/Fas-L, the Fas receptor (Fas-R) expression on lymphocyte, and serum soluble Fas (sFas) in an attempt to analyze the role of Fas receptor/ligand system in the multistep process of fibrosis/carcinogenesis and the possible use of the serum marker as possible candidate biomarkers for an early detection of hepatocellular carcinoma (HCC). Material and Method: The current study included 100 samples from cases at Theodor Bilharz Research Institute and Kasr Al Aini Hospital in Egypt. There were 90 cases of chronic hepatitis C (CHC) infection (and negative hepatitis B virus infection). There were 30 cases without liver cirrhosis, 30 cases with liver cirrhosis and 30 cases with HCC. 10 liver biopsies were taken from healthy livers as normal controls. Histopathologic study and immunohistochemistry for detection of hepatic Fas and Fas-L expression were determined for all cases. Electron microscopy (EM) and immunoelectron microscopy (IEM) examination for detection of Fas-R expression on lymphocytes were also done. sFas, liver function tests, serologic markers for viral hepatitis, and serum alpha-fetoprotein level (alpha-FP) were done.