Hepatitis D Virus and Hepatocellular Carcinoma

Area of Science:

• Hepatology
• Virology
• Oncology

Background:

• Hepatitis D virus (HDV) is a defective RNA virus requiring Hepatitis B virus (HBV) for replication and transmission.
• Chronic Hepatitis D is a severe liver disease associated with high rates of cirrhosis, liver decompensation, and hepatocellular carcinoma (HCC).
• The oncogenic role of HDV and its specific contribution to hepatocarcinogenesis remain under investigation.

Purpose of the Study:

• To investigate the molecular mechanisms by which HDV contributes to the development of HCC.
• To compare the molecular profile of HCC in HDV-HBV coinfection versus HBV monoinfection.

Main Methods:

• Analysis of molecular profiles of hepatocellular carcinoma (HCC) in patients with HDV-HBV coinfection.
• Comparison of gene expression patterns between HDV-HCC and HBV-HCC.

Main Results:

• Hepatocellular carcinoma (HCC) in HDV-HBV coinfection exhibits a unique molecular signature distinct from HBV monoinfection-associated HCC.
• Upregulated genes in HDV-HCC are enriched in pathways related to cell-cycle/DNA replication and DNA damage/repair.
• These findings suggest genome instability as a key mechanism in HDV-driven hepatocarcinogenesis.

Conclusions:

• HDV infection is associated with a distinct molecular profile in HCC, implicating genome instability in its oncogenesis.
• Despite dependence on HBV, HDV and HBV appear to promote carcinogenesis through different molecular pathways.
• Further research is needed to elucidate the precise mechanisms of HDV-induced liver cancer.