AIDS 2016: PrEP Use Exceeds 79,000 in U.S., But Some Groups Lagging Behind

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More than 79,000 people in the U.S. have started Truvada for pre-exposure prophylaxis (PrEP) over the past 4 years, according to the latest results from a survey of retail pharmacies by Gilead Sciences, presented today at the 21st International AIDS Conference (AIDS 2016) in Durban. Yet while large gains in PrEP use have been seen among men in cities with large gay communities, some groups are not benefitting as much as they could.

The U.S. Food and Drug Administration approved Truvada (tenofovir/emtricitabine) for HIV prevention in July 2012. Adoption was initially slow, but by late 2013 it began to rise steeply as gay and bisexual men began promoting PrEP within their communities. Yet it has been difficult to estimate the total number of people who have used PrEP because this information is not centrally collected.

At a conference in 2013, Gilead researchers first presented findings from a survey of just over half of U.S. pharmacies showing that fewer than 1300 Truvada prescriptions for PrEP were written in 2012, with about half ofrecipients being women. An update presented the following year brought the total to approximately 3250, and at a meeting in October 2015 PrEP researcher Robert Grant said the latest survey numbers showed that PrEP prescriptions had more than doubled, to around 8500, even as the proportion of responding pharmacies had fallen.

The Latest Numbers

At AIDS 2016 Scott McCallister from Gilead presented results from an analysis of de-identified patient-level prescription data from 80% of U.S. retail pharmacies that dispensed Truvada between January 2012 and December 2015.

The researchers used an algorithm to filter out Truvada prescriptions that probably were not for PrEP, excluding people who used it for HIV treatment (indicated by a recorded HIV diagnosis, opportunistic illnesses, or use of other antiretrovirals), HIV post-exposure prophylaxis (PEP), or off-label treatment of hepatitis B.

Results

In addition to the large size of the states that accounted for most prescriptions, some are home to cities with large gay populations that have promoted PrEP use within their communities and driven rapid increases, as seen in San Francisco, New York City, Chicago, and Seattle. But a smaller state -- Massachusetts -- actually had the highest percentage of its residents on PrEP, at 0.073%.

McCallister said that analyzing data on the race/ethnicity of PrEP users was more difficult because this information is generally not included in pharmacy prescription records. He did say, however, that those for whom this data were available were disproportionately white. At the recent ASM Microbe meeting Stacy Bush from Gilead reported that among the 44% of PrEP users with available data, whites made up 74%, with Hispanics (12%), African-Americans (10%), and Asians (4%) accounting for much smaller proportions.

McCallister noted that this breakdown of PrEP users does not reflect the distribution of the HIV epidemic in the U.S. According to the Centers for Disease Control and Prevention, 44% of new HIV diagnoses occur among African-Americans, who make up about 12% of the U.S. population. Young black gay and bisexual men are at especially high risk, and the highest incidence rates are mostly seen in states in the southeast.

"Despite this US trend of increasing use of [tenofovir/emtricitabine] for PrEP, barriers should be address in those at high risk of HIV acquisition," including women, people under age 25 and states with high infections rates, the researchers concluded.

Experts agree that the number of people starting Truvada for PrEP in Gilead's pharmacy survey is an underestimate of the total number of PrEP users in the U.S. For example, the survey does not include people who receive PrEP through the Medicaid system or private PrEP programs such as Kaiser Permanente in San Francisco.

McAllister's report said that looking at 2015 alone, a total of 2936 people were prescribed PrEP in New York City, 1094 in San Francisco, 1001 in Chicago, and 840 in Washington, D.C. In contrast, a recent informal surveyof large PrEP providers in San Francisco put the cumulative number at more than 6000. While these figures are not strictly comparable, they give a sense of the shortfall in the reported numbers.

Asked at an AIDS 2016 press conference about reasons for the disparities in PrEP use in different populations, McCallister suggested that gay men and perhaps transgender people may have a greater comfort level using PrEP because their providers are more knowledgeable and their communities have done more peer-to-peer education. Women, on the other hand, may have fewer "touchpoints" for accessing PrEP, as reproductive health clinics and OB/GYNs may not be as informed as sexual health clinics serving gay men, highlighting the need for broader education and awareness efforts.

[Editor's note: In response to a follow-up query, McCallister said that the large jump between the approximately 49,000 people reported at the ASM Microbe meeting and in the AIDS 2016 study abstract, and the 79,000 reported this week, is due to a switch to a more comprehensive pharmacy data source, which Gilead will use going forward.] 

7/19/16

 

Reference

K Rawlings, S McCaliister, B Palmer, et al. FTC/TDF (Truvada) for HIV Pre-exposure Prophylaxis (PrEP) Utilization in the United States: 2012-2015. 21st International AIDS Conference. Durban, July 18-22, 2016.Abstract TUAX0105LB.