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First evidence for DNA-based vaccination against chronic hepatitis C
Date:4/23/2009

Copenhagen, Denmark, Thursday 23 April: The first-proof-of-concept for a DNA-based therapeutic vaccination against chronic hepatitis C was announced today at EASL 2009, the Annual Meeting of the European Association for the Study of the Liver in Copenhagen, Denmark.

In the first clinical trial of a therapeutic vaccination using naked DNA delivered by in vivo electroporation (EP), antiviral effects were shown in patients with hepatitis C (HCV). Researchers hope that this will encourage further clinical development. The data also provide further evidence for the antiviral role of the HCV-specific T cell response.

It is estimated that some 3% of the world's population is infected with HCV. In industrialised countries, hepatitis C accounts for 70% of chronic hepatitis cases. One of the main concerns is that HCV infection remains asymptomatic until advanced stages of the disease.

Clearance of HCV infection correlates with activation of the host T cell response. Therefore, in this study, researchers developed a T cell vaccine based on a codon-optimised HCV non-structural (NS) 3/4A DNA-gene expressed under the control of the cytomegalovirus immediate-early promoter (ChronVac-C) delivered by in vivo electroporation (EP). A first phase I/IIa clinical trial in HCV infected patients is currently ongoing.

Professor Matti Sallberg of Laboratory Medicine, the Karolinska Institutet, Stockholm, Sweden, who led the study, said: "In 50-80% of adult cases, the immune system fails to eliminate the HCV virus and the disease becomes chronic. Given that only about 50% of HCV infected persons are diagnosed in most developed countries and that two-thirds need to undergo antiviral treatment, this new vaccination has huge implications in terms of the future management of this widespread disease."

In this study, a volume of 0.5 ml saline containing ChronVac-C DNA was injected at 1 cm depth in the deltoid muscle. This was followed by two 60m
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Contact: Camilla Dormer
easlpressoffice@cohnwolfe.com
44-787-619-0439
European Association for the Study of the Liver
Source:Eurekalert

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