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Tenofovir concentrations in hair strongly predict virologic suppression in breastfeeding women

Murnane, Pamela M.a; Bacchetti, Peterb; Currier, Judith S.c; Brummel, Seand; Okochi, Hideakie; Phung, Nhif; Louie, Alexanderf; Kuncze, Karenf; Hoffman, Risa M.c; Nematadzira, Teaclerg; Soko, Dean K.h; Owor, Maxensiai; Saidi, Fridayj; Flynn, Patricia M.k; Fowler, Mary G.l; Gandhi, Monicaf

doi: 10.1097/QAD.0000000000002237
EPIDEMIOLOGY AND SOCIAL: CONCISE COMMUNICATIONS
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Background: Antiretroviral treatment (ART) adherence is often suboptimal in the perinatal period. We measured hair tenofovir (TFV) concentrations as a metric of adherence in postpartum women to understand patterns and predictors of adherence throughout this critical period. In addition, we examined the association between hair TFV concentrations and virologic outcomes.

Methods: Between 12/2012 and 09/2016, hair samples were collected longitudinally from delivery through breastfeeding from women on ART in the Promoting Maternal and Infant Survival Everywhere study (NCT01061151) in sub-Saharan Africa. Hair TFV levels were measured using validated methods. Using generalized estimating equations, we estimated the association between hair TFV levels and virologic suppression (<400 copies/ml) over time and assessed predictors of hair TFV levels.

Results: Hair TFV levels were measured at 370 visits in 71 women from delivery through a median of 14 months (interquartile range 12–15) of breastfeeding. Levels ranged from below detection (0.002) to 1.067 ng/mg (geometric mean: 0.047). After at least 90 days on ART, 69 women had at least one viral load measured (median 5 measures, range 1–9); 18 (26%) experienced viremia at least once. Each doubling of TFV level more than doubled odds of concurrent virologic suppression [odds ratio 2.35, 95% confidence interval (CI): 1.44–3.84, P = 0.0006] and was associated with 1.43 times the odds of future suppression (95% CI: 0.75–2.73, P = 0.28). Relative to the first 3 months after delivery, hair levels were highest in months 6–12 (1.42-fold higher, 95% CI: 1.09–1.85, P = 0.01).

Conclusion: Hair TFV levels strongly predicted concurrent virologic suppression among breastfeeding women. Objective adherence metrics can supplement virologic monitoring to optimize treatment outcomes in this important transition period.

aDepartment of Medicine, Center for AIDS Prevention Studies

bDepartment of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco

cDivision of Infectious Diseases, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California

dCenter for Biostatistics in AIDS Research, T.H. Chan School of Public Health, Harvard University, Cambridge, Massachusetts

eDepartment of Bioengineering and Therapeutic Sciences, Schools of Pharmacy and Medicine

fDivision of HIV, Infectious Diseases, and Global Medicine, Department of Medicine, University of California, San Francisco, San Francisco, California, USA

gClinical Trials Research Centre, University of Zimbabwe College of Health Sciences, Harare, Zimbabwe

hCollege of Medicine-Johns Hopkins Research Project, Blantyre, Malawi

iMakerere University-Johns Hopkins University Research Collaboration, Kampala, Uganda

jUniversity of North Carolina-Lilongwe, Lilongwe, Malawi

kDepartment of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee

lDepartment of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

Correspondence to Pamela M. Murnane, PhD, MPH, Department of Medicine, Center for AIDS Prevention Studies, University of California, San Francisco, San Francisco, California, USA. E-mail: pamela.murnane@ucsf.edu

Received 12 February, 2019

Revised 18 March, 2019

Accepted 22 March, 2019

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