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First Vaccine for Viral Hepatitis C Could Become a Reality


News provided by

European Association for the Study of the Liver

Apr 01, 2011, 11:15 ET

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BERLIN, April 1, 2011 /PRNewswire/ -- Early data from phase I trials of an HCV vaccine presented today at the International Liver Congress(TM) show encouraging results, with high immunogenicity and good safety profile.(1),(2)

To view the Multimedia News Release, please click:

http://multivu.prnewswire.com/mnr/prne/easl/48894/

In the first study[1], a therapeutic T-cell vaccine, based on novel adenoviral vectors was used on a small population of treatment naive patients with chronic genotype 1 HCV infection. Intra-muscular vaccination was administered 2 or 14 weeks into a 48-week course of treatment with Peg-IFNa2a/ribavirin. 50% of vaccinated patients had CD4+ and CD8+ HCV specific T-cell responses as detected by ELISpot at 2-8 weeks post boost, showing a strong immunogenicity for the vaccine. Local and systemic adverse events to vaccination were mild, with no evidence of liver immunopathology (measured by liver transaminase levels).

The second study[2] looked at the potential for a prophylactic vaccine based on similar novel adenoviral vectors technology ( replicative-defective human Ad6 and a novel simian AdCh3 vector that encode 1985 amino-acids derived from the NS3-5 region of a genotype-1b strain). 27 healthy volunteers were vaccinated following a double prime, heterologous boost strategy. The vaccine induced polyfunctional CD4+ and CD8+ T cells responses which were maintained up to 52 weeks post prime. Overall vaccination was very well tolerated with mild/moderate local and systemic reactions and no serious adverse advents.

Professor Heiner Wedemeyer, EASL's Secretary General commented: "Vaccines are an exciting area of research now with the potential to add to the range of treatments available for patients with chronic viral hepatitis. These are early data but results are very encouraging indeed and as experts, we look forward to more scientific evidence being made available to support this new technology as a future treatment option as well as potentially preventing infection."

Previous research and data presented at the International Liver Congress shows that vaccination with adenoviral vectors induced highly potent and durable T-cell responses in healthy human and that similar vectors may prevent chronic infection in animals.(3) This is the first time the immunogenicity and safety of vaccination was tested on HCV patients and healthy subjects.

Notes to Editors

About EASL

EASL is the leading European scientific society involved in promoting research and education in hepatology. EASL attracts the foremost hepatology experts and has an impressive track record in promoting research in liver disease, supporting wider education and promoting changes in European liver policy.

EASL's main focus on education and research is delivered through numerous events and initiatives, including:

- The International Liver Congress(TM) ( http://www.easl.eu/_the-international-liver-congress/general-information) which is the main scientific and professional event in hepatology worldwide

- Meetings (http://www.easl.eu/_events) including Monothematic and Special conferences, Post Graduate courses and other endorsed meetings that take place throughout the year

- Clinical and Basic Schools of Hepatology (http://www.easl.eu/_education ), a series of events covering different aspects in the field of hepatology

    - Journal of Hepatology (
https://www.easl.eu/members/journal-of-hepatology) published monthly

- Participation in a number of policy initiatives at European level

About The International Liver Congress(TM) 2011

The International Liver Congress(TM) 2011, the 46th annual meeting of the European Association for the study of the Liver, is being held at the Internationales Congress Centrum, Berlin, Germany from March 30 - April 3, 2011. The congress annually attracts over 7,500 clinicians and scientists from around the world and provides an opportunity to hear the latest research, perspectives and treatments of liver disease from principal experts in the field.

References

---------------------------------

[1] Kelly C et al. A therapeutic vaccine for HCV based on novel, rare, adenoviral vectors. Abstract presented at the International Liver Congress(TM) 2011. (750)

[2] Barnes E. Phase I trials of a highly immunogenic and durable T-cell vaccine for Hepatitis C virus based on novel, rare, adenoviral vectors. Abstract presented at the International Liver Congress(TM) 2011. (2104)

[3] Folgori A et al. A T-cell HCV vaccine eliciting effective immunity against heterologous virus challenge in chimpanzees. Nature Medicine - 12, 190 - 197 (2006)

SOURCE European Association for the Study of the Liver

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