Tosha Rogers, MD, is a one-woman HIV prevention evangelist. For nearly a decade now, the Atlanta-based ob/gyn has been on a mission to increase her gynecological colleagues’ awareness and prescribing of the oral HIV prevention pill. At the same time, she’s been tracking the development of a flexible vaginal ring loaded with a month’s worth of the HIV prevention medication dapivirine. That, she thought, would fit easily into women’s lives and into the toolbox of methods women already use to prevent pregnancy.
But now she’s not sure when – or if – the ring will find its way to her patients. In December, the ring’s maker, the International Partnership for Microbicides (IPM), pulled its application for FDA approval for the pre-exposure prophylaxis (PrEP) ring. Now, one year after the World Health Organization recommended the ring for member nations, there appears to be no path forward in the United States for either the dapivirine-only ring or an approach Dr. Rogers said would change the game: a vaginal ring that supplies both contraception and HIV prevention.
“It would take things to a whole other level,” she said. “It sucks that this happened, and I do think it was not anything medical. I think it was everything political.”
That leaves cisgender women – especially the Black and Latinx women who make up the vast majority of women who acquire HIV every year – with two HIV prevention options. One is the daily pill, first approved in 2012. It’s now generic but previously sold as Truvada by Gilead Sciences. The other is monthly injectable cabotegravir long-acting (Apretude). Another HIV prevention pill, tenofovir alafenamide/emtricitabine (Descovy), is approved for gay men and transgender women but not cisgender women.
Vagina-specific protection from HIV
The WHO recommendation for the vaginal ring was followed last July by a positive opinion from the Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency (EMA) for women in low- and middle-income countries outside the European Union.
The flexible silicone ring, similar to the hormonal NuvaRing contraceptive, works by slowly releasing the antiretroviral dapivirine directly into the vaginal canal, thereby protecting women who might be exposed to the virus through vaginal sex only. Because the medicine stays where it’s delivered and doesn’t circulate through the body, it has been found to be extremely safe with few adverse events.
However, in initial studies, the ring was found to be just 27% effective overall. Later studies, where scientists divided women by how much drug was missing from the ring – a proxy for use – found that higher use was associated with higher protection (as much as 54%). By comparison, Truvada has been found to be up to 99% effective when used daily, though it can take up to 21 days to be available in the vagina in high enough concentrations to protect women from vaginal exposure. And the HIV prevention shot was found to be 90% more effective than that in a recent trial of the two methods conducted by the HIV Prevention Trials Network.
This, and an orientation away from topical HIV prevention drugs and toward systemic options, led the National Institute of Allergy and Infectious Diseases (NIAID) to discontinue funding for such projects under its Microbicide Trials Network.
“Clearly you want to counsel women to use the highest efficacy method, and that is part of our label,” Zeda Rosenberg, ScD, IPM’s founder and chief executive officer, told this news organization. “Women should not choose the ring if they can and will use oral PrEP, and I would argue it should be the same thing for [cabotegravir shots]. But if they can’t or don’t want to – and we know that especially many young women don’t want to use systemic methods – then the dapivirine ring is a great option.”
Still, Dr. Rosenberg said that the gap in efficacy, the relatively small number of women affected by HIV in the U.S. compared with gay and bisexual men, and the emergence of products like the HIV prevention shot cabotegravir, made it “very unlikely” that FDA regulators would approve the ring. And rather than be “distracted” by the FDA process, Dr. Rosenberg said IPM chose to concentrate on the countries where the ring has already been approved or where women make up the vast majority of people affected by HIV.
Zimbabwe publicly announced it has approved the ring, and three other countries may have approved it, according to Dr. Rosenberg. She declined to name them, saying they had requested silence while they formulate their new HIV prevention guidelines. Aside from Zimbabwe, the other countries where women participated in the ring clinical trials were South Africa, Malawi, and Uganda.
“The U.S. population ... has widespread access to oral PrEP, which is unlike countries in Africa, and which would have widespread access to injectable cabotegravir,” she said. “The U.S. FDA may not see choice in the same way that African women and African activists and advocates see the need for choice.”
But women’s rates of accessing HIV prevention medications in the U.S. continues to be frustratingly low. At the end of 2018, just 7% of women who could benefit from HIV prevention drugs were taking them, according to Centers for Disease Control and Prevention data.
New CDC guidelines recommend clinicians talk to every sexually active adult and adolescent about HIV prevention medications at least once and prescribe it to anyone who asks for it, whether or not they understand their patients’ HIV risks. However, research continues to show that clinicians struggle with willingness to prescribe PrEP to Black women, and the American College of Obstetrics and Gynecology’s committee opinion on managing women using HIV prevention drugs has not been updated to reflect the new guidelines. And while the HIV prevention shot is approved for women and its maker ViiV Healthcare is already initiating postmarket studies of the ring in key populations including women, there are lots of things that need to line up in order for clinicians to be willing to stock it and prescribe it to women.
From where Dázon Dixon Diallo, executive director of the nonprofit SisterLove, sits, the decision to withdraw the ring from FDA consideration and the FDA’s seeming argument that the epidemiology in the U.S. doesn’t warrant the ring’s approval is a slap in the face to the Black women who have led the movement to end HIV in the U.S. for decades.
“No matter how you slice it, we’re talking about Black women, and then we’re talking about brown women,” said Ms. Diallo. “The value [they place on us] from a government standpoint, from a political standpoint, from a public health standpoint is just woeful. It’s woeful and it’s disrespectful and it’s insulting and I’m sick of it.”