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Second European PrEP study closes placebo arm early due to high effectiveness
Gus Cairns, 2014-10-29 08:30:00

In an extraordinary development, a second European scientific trial of pre-exposure prophylaxis (PrEP) has had its randomised phase closed early due to high effectiveness, just two weeks after the UK PROUD trial did exactly the same thing.

The investigators of the IPERGAY trial, which has six sites in France and one in Canada, announced today a “Significant breakthrough in the fight against HIV and AIDS” because IPERGAY had successfully demonstrated the effectiveness of its PrEP regimen.

IPERGAY’s early closure is significant not only because it adds confirmation that PrEP can be highly effective, but because it was testing an innovative, intermittent (“on-demand”) PrEP regimen. In this study, participants did not take PrEP daily, but only when they anticipated having sex. The regimen involved taking two pills of Truvada (tenofovir + emtricitabine) in the 24-hour period before anticipated sex and then, if sex happened, two separate one-pill doses in the two days following sex.* This extends the versatility of PrEP and provides an alternative regimen to daily dosing.

IPERGAY was run by the French national AIDS research institute, ANRS, and began in February 2012. It randomised gay men at high risk of HIV infection to the Truvada regimen or to a placebo – a protocol that caused some controversy among activists who felt studies such as iPrEx had already demonstrated that PrEP worked. All participants were also offered a package of measures including “personalised and frequent” counselling, repeated HIV testing, screening and treatment for other sexually transmitted infections, hepatitis B vaccination, condoms and lubricant. At the time of closure of its randomised phase, the trial had approximately 400 participants.

Following the decision taken by the PROUD study investigators to give daily Truvada to all its participants, ANRS urgently contacted the IPERGAY trial data safety monitoring board (DSMB) for a review. The DSMB examined the unblinded data and found a significant difference in incidence between the two groups with a “very significant reduction” in the risk of HIV infection in the PrEP group, which a press release describes as “much higher than the one observed in the IPREX trial” (as is the case with PROUD). The DSMB therefore recommended that all trial participants were offered Truvada, taking it “on demand” as in the trial.

As with PROUD, no actual effectiveness figure or other quantitative data were released, pending full analysis of the figures. The full results should be available early in 2015.

The trial will continue in non-randomised form for at least a year, as will PROUD, because of the need to demonstrate that “on demand” PrEP can have long-term benefit and to gather data on safety.

Principal investigator Professor Jean-Michel Molina said, "The biomedical concept of on-demand PrEP at the time of sexual exposure, in a broader prevention framework, is validated. We owe this to all trial volunteers without whom we could never have achieved these results". He adds that “condoms remain the cornerstone of HIV prevention. Combining all prevention tools that have proved to be effective will certainly allow us to better control the HIV epidemic.”

Professor Jean-François Delfraissy, Director of ANRS, commented, "This is a major breakthrough in the fight against HIV. The results of the ANRS IPERGAY trial should change national and international recommendations for HIV prevention".

*Note: this article has been updated to clarify the exact dosing schedule used in the IPERGAY studied.

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