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AIDS Vaccine Advocacy Coalition (AVAC) reports that the Mosaico study, a large-scale HIV vaccine efficacy study also known as HVTN 706/HPX3002, was stopped early for non-efficacy.
The study took place in several countries in North and South America and Europe to test the safety and efficacy of the adenovirus26-based vaccine regimen among 3,900 cis-gender men and transgender individuals who have sex with cis-gender men and/or transgender individuals.
An independent data and safety monitoring board, at a scheduled review of the trial data, found the regimen to be safe, but that it did not meet the pre-defined criteria for efficacy and recommended that the study be stopped and trial participants informed.
The Mosaico study used a similar version of the vaccine regimen in its companion study, the Imbokodo trial, which was stopped in August 2021 as it also did not significantly reduce the overall risk of HIV acquisition among over 2,600 cis-gender women in five sub-Saharan African countries.
