The Safety and Immunogenicity of the DNA-GTU Vaccine Administered to HIV-infected Patients on ART vs Placebo

The investigators are exploring combination regimens with the overall aims of (i) optimising immune responses and (ii) developing safe and well tolerated strategies which will favour the development of T-cell responses that may enhance anti-HIV HIV therapy with the forward looking goal of working towards functional eradication of infection. The investigator proposes to combine the previously used IM and TC methods because preclinical data suggest that the combination of methods will favour the development of CD8 T cell responses. All groups will receive 6.0mg of the vaccine IM given in 3 doses over 12 weeks. Group 1 will receive the 6.0mg IM with electroporation (EP) and Group 2 will receive the 6.0mg IM without EP but together with an additional 1.2mg vaccine TC. The primary immunogenicity endpoint will be to determine whether either intervention group augments the cellular responses to vaccine specific peptides in relation to baseline. It is anticipated that none of subjects receiving saline placebo would have an increase in vaccine specific responses relative to those at baseline. Therefore if the differences between the active groups and saline placebo are sufficiently large, for example 80% responders in a GTU®-MultiHIV DNA active group, \<10% in the control group, this would be significant. Should the regimes prove safe, acceptable and induce significant immunogenicity then the intention is to move one or both regimes into a larger study powered to determine their potential long-term impact on therapy when used in combination with conventional ARV regimens. Proof of concept that DNA vaccination can induce de novo HIV specific responses that are associated with control of viral replication, would justify further investigation of their use in immunotherapies combined with ART intensification and/or anti-latency drugs.