Long-term retention in pre-exposure prophylaxis care among men who have sex with men and transgender women in the United States

Introduction Retention in HIV pre-exposure prophylaxis (PrEP) care in real-world settings, outside of controlled trials or demonstration projects, remains poorly understood. Methods We evaluated retention in PrEP care outcomes among men who have sex with men (MSM) and transgender women prescribed PrEP through March 2017 at three clinical sites in the United States (US): Jackson, Mississippi; Providence, Rhode Island; and St. Louis, Missouri. We determined retention rates by attendance of clinical visits every three months, per US Centers for Disease Control and Prevention (CDC) guidelines, as well as by the timing of patients' actual clinical visits. Multivariable analyses examined demographic and behavioural factors associated with retention. Results From 2013 to 2015, 282 MSM and transgender women were prescribed PrEP; 82% attended a follow-up visit. Based on CDC recommendations, 56% of patients were retained in PrEP care at the first follow-up visit, having attended a visit three months after initiation. However, 76% had a follow-up visit within eight months. Thirty-percent were retained at 12 months by CDC criteria, but 62% were retained when using a 16-month endpoint. Self-reported adherence was strongly correlated with retention. In multivariable analyses, younger age was associated with decreased odds of retention at initial follow-up, and completing college was associated with increased odds of retention at 16 months. Eight participants were newly diagnosed with HIV; six were African American, and seven were under 30 years of age. Conclusions Measuring retention in PrEP care using three-month follow-up intervals may underestimate true retention. Nevertheless, retention in PrEP care is suboptimal in real-world settings and should be the focus of future interventions.