First-in-Human Evaluation of the Safety and Immunogenicity of a Recombinant Adenovirus Serotype 26 HIV-1 Env Vaccine (IPCAVD 001)
01/2013
Journal Article
Authors:
Baden, L.R.;
, ;
Seaman, M.S.;
Tucker, R.P.;
Krause, K.H.;
Patel, A.;
Johnson, J.A.;
Kleinjan, J.;
Yanosick, K.E.;
Perry, J.;
Zablowsky, E.;
Abbink, P.;
Peter, L.;
Iampietro, M.J.;
Cheung, A.;
Pau, M.G.;
Weijtens, M.;
Goudsmit, J.;
Swann, E.;
Wolff, M.;
Loblein, H.;
Dolin, R.
Secondary:
J Infect Dis
Volume:
207
Pagination:
240-247
URL:
http://www.ncbi.nlm.nih.gov/pubmed?term=23125444
Abstract:
Background. We report the first-in-human safety and immunogenicity assessment of a prototype Ad26 vector-based human immunodeficiency virus (HIV) vaccine in humans. Methods. Sixty Ad26-seronegative, healthy, HIV-uninfected subjects were enrolled in a randomized, double-blinded, placebo-controlled, dose-escalation phase 1 study. Five groups of 12 subjects received 10(9)-10(11) vp of the Ad26-EnvA vaccine (N = 10/group) or placebo (N = 2/group) at weeks 0 and 24 or weeks 0, 4, and 24. Safety and immunogenicity were assessed. Results. Self-limited reactogenicity was observed after the initial immunization at the highest (10(11) vp) dose. No product-related SAEs were observed. All subjects who received the Ad26-EnvA vaccine developed Ad26 NAb titers, EnvA-specific enzyme-linked immunosorbent assays (ELISA) titers, and EnvA-specific enzyme-linked immunospot assays (ELISPOT) responses. These responses persisted at week 52. At week 28 in the 10(9), 10(10), 10(11) vp 3-dose and the 10(10) and 5 × 10(10) vp 2-dose groups, geometric mean EnvA ELISA titers were 6113, 12 470, 8545, 3470, and 9655 and mean EnvA ELISPOT responses were 397, 178, 736, 196, and 1311 SFC/10(6) peripheral blood mononuclear cells, respectively. Conclusion. This Ad26 vectored vaccine was generally safe and immunogenic at all doses tested. Reactogenicity was minimal with doses of 5 × 10(10) vp or less. Ad26 is a promising new vaccine vector for HIV-1.
