The Daily Populous Monday December 16th, 2024 morning edition
Authored by npr.org and submitted by shoofinsmertz

This drug is the 'breakthrough of the year' — and it could mean the end of the HIV epidemic

Can we eliminate the HIV epidemic?

It's a question that dates back to the start of the epidemic in the 1980s. With 1.3 million new infections a year, the epidemic continues … and the world is not on track to meet the ambitious U.N. goal of ending HIV/AIDS by 2030.

But 2024 has fueled increasing optimism among leading infectious disease experts after the results of two groundbreaking clinical trial results for a drug called lenacapavir showed it to be capable of virtually eliminating new HIV infections through sex.

The emerging data surrounding lenacapavir is so astonishing that the drug's development has been heralded as the 2024 Breakthrough of the Year by the journal Science, which described it as representing "a pivotal step toward diminishing HIV/AIDS as a global health crisis."

PURPOSE 2, a study sponsored by Gilead Science, the California-based maker of lenacapavir, found the drug to be 96% effective in preventing HIV infections in the newly released results of a clinical trial of more than 3,200 cisgender men, transgender men, transgender women and gender non-binary individuals who have sex with partners assigned male at birth. The study was conducted across sites in Argentina, Brazil, Mexico, Peru, South Africa, Thailand and the United States.

These results followed equally dramatic findings from a previous lenacapavir trial called PURPOSE 1 which involved 5,300 cisgender women in South Africa and Uganda. In news which headlined the AIDS 2024 conference in Munich in July, early results indicated 100% efficacy, after Gilead Sciences revealed that not a single woman who had received the drug since the trial began in August 2021, had contracted HIV.

As recognized by Science, the development of lenacapavir's has come through many years of research into the structure and function of HIV's capsid protein, which shields the virus's genetic material. Lenacapavir's remarkable ability to block HIV transmission is based on its ability to rigidify this protein, blocking key stages of viral replication.

Ethel Weld, an assistant professor of medicine at the Johns Hopkins University School of Medicine, described the results from the PURPOSE 1 and PURPOSE 2 trials as "a thrilling game changer for HIV prevention."

In particular, lenacapavir, which is administered via a twice-yearly injection, represents a dramatic new alternative to the current standard of care for HIV prevention: taking a pill called Truvada every day. While this type of drug, called pre-exposure prophylaxis (PrEP), has also been shown to be 99% effective in blocking HIV infections from sex in clinical trials, this is not necessarily the case in the real world.

People don't always take their pills. In a study in South Africa, women said they felt there was a stigma to the pill -- a sexual partner might assume they're taking it because they already have HIV or because they have other partners. Research has also highlighted significant barriers in taking daily oral PrEP among men who have sex with men, ranging from access to the drug, inconvenience, and perceptions that it is unnecessary. One study showed oral PrEP effectiveness to be as low as 26% in certain populations -- men under age 30, for example.

Sponsor MessageWeld points out that in both the PURPOSE 1 and PURPOSE 2 trials, it was notable that the participants randomized to receive daily oral PrEP instead of lenacapavir, showed low adherence to the medication.

"The burden of taking daily medicine varies for each individual and may well be perceived as an even greater burden for healthy people who feel fine," says Weld. "The finding that twice yearly injections have high efficacy in preventing HIV, lowers the amount that an individual has to do over the course of a lifetime to protect themselves. It puts lenacapavir much closer to the domain of other preventive paradigms such as vaccination."

Advocacy groups have also expressed great enthusiasm. "Lenacapavir would be "a real game-changer," particularly for people facing stigma and discrimination in low- and middle-income countries," read a statement by People's Medicines Alliance -- a global coalition of more than 100 organizations that span 33 countries and that advocate for making medications more accessible.

Cécile Tremblay, a HIV researcher at the University of Montréal, highlighted the drug's potential to tackle the epidemic in sub-Saharan Africa where the disease burden is greatest. Despite accounting for 10% of the world's population, sub-Saharan Africans comprise two-thirds of people living with HIV -- 25.7 million out of 38.4 million. Every week, about 4,000 teen girls and young women in Africa are newly infected with HIV.

"Not only is lenacapavir extremely efficacious but the efficacy has been shown in a population of women in sub-Saharan Africa where the epidemic is the greatest, and oral PrEP has not performed as well due to stigma and discrimination," says Tremblay.

Lenacapavir is not a new drug. It's been approved by the FDA in the United States for multi-drug resistant HIV treatment since 2022. But PURPOSE 1 and PURPOSE 2 are the first clinical trials to test it for HIV prevention.

According to Gilead Sciences, the data from the two trials will now be used to support a series of global regulatory filings which will begin by the end of 2024, with the aim of launching lenacapavir onto the market at some point in 2025.

Yet any eventual approval and widespread use would come with challenges. According to an analysis presented at the 24th International AIDS Conference (AIDS 2022), PrEP medications would need to cost less than $54 a year per patient for South Africans, for example, to be able to afford them. Lenacapavir's cost as HIV treatment in the United States in 2023 was $42,250 per new patient per year. Oral PrEP options, on the other hand, can cost less than $4 a month.

Given the drug's potential, Tremblay says that it is critical for access to be as widespread as possible.

"The infrastructure needs to be in place to reach at-risk populations and make sure they can access it," she says. "If everyone at risk could receive this prophylaxis, within a few years it could alter the course of the epidemic. When you substantially decrease the transmission rate, then the epidemic can wane down."

Professor Linda-Gail Bekker, director of the Desmond Tutu HIV Centre at the University of Cape Town, wholeheartedly agrees. "While we're waiting for the generic companies [to make generic forms of lenacapavir], I feel that places where the lenacapavir trials have been run should have access to this product either from the original company or hopefully in future, from generics companies. We can't have a world where we don't see this miracle getting into the hands of the people who contributed to this."

Spuddups84 on December 15th, 2024 at 23:30 UTC »

I'm sure Americans will be able to afford it with our stellar Healthcare system that's the envy of the modern world

SignificantHippo8193 on December 15th, 2024 at 21:36 UTC »

Another big step in the right direction. While there are many things we still have to do, the fact that this could be a solid foundation to ending the epidemic is a great thing.

shoofinsmertz on December 15th, 2024 at 21:00 UTC »

PURPOSE 2, a study sponsored by Gilead Science, the California-based maker of lenacapavir, found the drug to be 96% effective in preventing HIV infections in the newly released results of a clinical trial of more than 3,200 cisgender men, transgender men, transgender women and gender non-binary individuals who have sex with partners assigned male at birth.

These results followed equally dramatic findings from a previous lenacapavir trial called PURPOSE 1 which involved 5,300 cisgender women in South Africa and Uganda. In news which headlined the AIDS 2024 conference in Munich in July, early results indicated 100% efficacy, after Gilead Sciences revealed that not a single woman who had received the drug since the trial began in August 2021, had contracted HIV.

Gilead charges $42k per patient, but the generic formula will be allowed to be produced by other companies for cheap in developing countries according to the New York Times.