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Expert Rev Vaccines. 2008 Apr;7(3):303-9. doi: 10.1586/14760584.7.3.303.

STEP trial and HIV-1 vaccines inducing T-cell responses.

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MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, The John Radcliffe, Oxford OX3 9DS, UK.


Recombinant, nonreplicating, human adenovirus serotype 5-vectored vaccine, known as MRKAd5, expressing three HIV-1 clade B-derived internal proteins when used in a homologous immunization regimen, did not decrease HIV-1 infection rate nor postinfection virus load in the first Phase IIb proof-of-concept trial. However, the vaccine did not reach the limits of vaccine T-cell induction and its design can be improved both from the point of the HIV-1-derived immunogens and their delivery. Therefore, failure of the first experimental HIV-1 vaccine focusing on induction of T-cell responses cannot be a reason for dismissal of the whole T-cell vaccine concept, nor for losing a positive attitude toward systematic HIV-1 vaccine development.

[Indexed for MEDLINE]

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