HCV Vaccine where do we stand? U. Spengler University of Bonn
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1 HCV Vaccine where do we stand? U. Spengler University of Bonn
2 THE IDEAL GOAL: The vaccine should induce sterilizing immunity A MORE REALISTIC GOAL: Prevention of chronic persistent infection
3 Feinstone et al. CID 2012 Osburn Gastroenterology 2010
4 Upon HCV re infection patients have reduced max HCV loads and reduced duration of acute disease Re infection is associated with the appearance of new multispecific T cell responses Re infection is associated with generation of cross reactive neutralizing Abs Osburn Gastroenterology 2010
5
6 B Cells Antigen Adjuvant MHCII CD4+ Helfer T Helper Cells Neutralising Abs T Co stimulatory signals IFN CD8+ cytotoxic T Cells T MHCI
7 Correlates of Protective Immunity Neutralising Antibodies: Neutralising antibodies appear much earlier in resolving than persisten hepatitis C and contemporaneous isolates are efficiently neutralized. Pestka et al. PNAS 2007 Dowd et al. Gastroenterology 2009 Rare spontaneous elimination of chronic hepatitis C may involve late neutralizing Ab responses. Rhaguraman et al. JID 2012 Broad, multispecific T cell responses: T cell responses are temporally associated with control of primary and secondary HCV infection. Rehermann J Clin Invest 2009 Depletion of CD4+ and CD8+ T cells in immune chimpanzees results in prolonged or persistent HCV infection. Shoukry et al. J Exp Med 2003 Grakoui et al. Science 2003
8 The Problem of Global HCV Diversity 1/2/3 1/2/3 1/2/3 1/ /2 1/2/ /2 1/2/6 5 A preventive vaccine should be broadly reactive to many isolates To prevent shifts in dominant genotype in some regions of the world To also protect migrant populations To prevent emerging of new more violent isolates
9 C. Walker EASL Monothematic Conference on HCV 2012
10 Meta Analysis of 13 published Chimpanzee Studies Pooled Results: Recombinant envelope glycoproteins (E1/E2) Virus like particles (C E1 E2) Recombinant DNA vaccines Recombinant MVA and VV vectors Dahari et al. Gastroenterology 2010
11 Meta Analysis of 13 Chimpanzee Studies Dahari et al. Gastroenterology 2010
12 E1/E2 antibody vaccine Novartis/Chiron Recombinant genotype 1a (HCV1) E1 and E2 proteins Generated in CHO cells micro fluidised (MF59) oil in water emulsion as adjuvant
13 Sterilizing Immunity and Resolution in Chimpanzees The vaccine seems to also induce HCV specific CD4+ T cells which may protect from HCV persistence M. Houghton Immunol Rev 2011
14 S.E. Frey et al.; Vaccine 2010; 28: 6367 Safety and Immunogenicity of HCV E1E2 Vaccine Adjuvanted with MF59 Administered to Healthy Adults R. Ray et al.; J Infect Dis 2010; 202: 862 Characterization of Antibodies Induced by Vaccination with Hepatitis C Virus Envelope Glycoproteins Stamataki J Infect Dis 2011
15 T cell vaccine Okairos Gene cassette encompassing non structural proteins NS3 NS5B Derived from HCV genotype 1b strain Bk Expressed from recombinant adenovirus vectors, sometimes also plasmids and vaccinia vectors
16 T cell HCV Vaccine in Chimpanzees Anjmals received Ad6, Ad24 or plasmid DNA vaccines and were challenged with a genotype 1a isolate (H77) Peak viraemia 100 fold reduced in vaccinated versus control animals. Duration of disease shorter in vaccinated (1 7 wks) versus control animals (16 20 wks). Folgori et al. Nat Medicine 2006
17 The NS3 NS5B gene cassette elicits strong T cell responses in humans when delivered with ChAd3 and Ad6 vectors E. Barnes Science Translational Medicine 2012
18 Cross recognition of genotypes 1a and 3a E. Barnes Science Translational Medicine 2012
19 Therapeutic Vaccines Targeted to strengthen and recover exhausted T cell responses rather to induce neutralizing antibodies
20 TG4040 Phase I Study: Treatment naive Patients Design TG4040 = modified poxvirus (Ankara strain) expressing HCV NS3, NS4 and NS5B Habersetzer et al Gastroenterology 2011
21 TG4040 Phase I Study: Treatment naive Patients 5/15 patients developed vaccine induced strong HCV specific cellular immune responses 8 patients had transient drops in HCV viraemia (from 0.52 log to 1.24 log) The most pronounced drop in HCV RNA occurred in two patients who also showed the strongest T cell responses All doses were well tolerated without serious adverse events Habersetzer et al Gastroenterology 2011
22 TG4040 Phase I Study: Treatment naive Patients ELISpot Results Habersetzer et al Gastroenterology 2011
23 DNA Vakzination mit in vivo Elektroporation 2 electric pulses (60 ms) immediately after DNA injection M. Sällberg EASL 2009
24 M. Sällberg EASL 2009
25 167 µg no effects on viral load or ALT 500 µg 1500 µg M. Sällberg EASL 2009
26 Intercell IC41 Peptid Vakzine Poly Arginin Klade et al. Gastroenterology 2008
27 Intercell IC41 Peptide Vaccine Phase II Study 50 treatment naive patients HCV genotype I Group A: 8 intradermal bi weekly injections plus Imiquimod (TLR 8 Agonist) Group B : 16 subcutaneous injections every week; no imiquimod 0.2 log (p=0.001) In patients with high viral loads (>2x10 6 IU/ml) 0.61 log, p=0, log (p< 0.001) 8 patients (24%) > 0.8 log drop in HCV loads Klade et al. Vaccine 2012
28 Therapeutic IC41 Vaccine as late add on to standard p interferon/ribavirin 35 patients ; 6 injections weeks Increased HCV specific T cell responses in 73%. However, IC41 did not delay relapse, which occurred in 8 patients (32%) Wedemeyer et al. Vaccine 2009
29 GlobeImmune Phase IIb Study GI Tarmogen = recombinant HCV Core NS3 fusion protein expressed in Yeast Phase II Study in treatment naive (n= 110) and non responder (n=24) Patients Core NS3 Randomisation 1 : 1 Standard therapy versus standard therapy + Tarmogen 5 GI 5005 weekly run in injections, then boostering every 2 months on Peg/R therapy Triple arm: 68 treatment naive, 18 non responder patients SOC arm: 5o treatment naive, 19 non responder patients I.M. Jacobson et al. EASL 2010
30 GlobeImmune GI 5005 Phase IIb Study 63% TH Naive Non Responder GI5005 Triple 58% 45% 48% SOC 33% 11% 17% 5% 63% IL28B GT TT *: p=0.037 I.M. Jacobson et al. EASL % Shiffman et al. AASLD 2012
31 Conclusions It is unlikely that a HCV vaccine can obtain sterilizing immunity. However, attenuated primary infection may still afford protection from chronic hepatitis Many promising vaccine candidates have entered clinical trials but show limited efficacy Suitable high risk populations should be defined for broader studies on clinical utility.
32 Thank you for your attention
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