Antiretroviral Drug Concentrations in Breastmilk, Maternal HIV Viral Load, and HIV Transmission to the Infant: Results From the BAN Study

Background: Concentration of antiretroviral (ARV) drug found in plasma, and amounts of drug excreted into breastmilk, may affect HIV viral load and potentially perinatal HIV transmission. Methods: In this cohort study with 2-phase sampling, we included mothers randomized to postpartum maternal ARVs or daily infant nevirapine during 28 weeks of breastfeeding in the Breastfeeding, Antiretrovirals, and Nutrition study. Among these, we included all mothers who transmitted HIV to their infants between 2 and 28 weeks and 15% of mothers who did not (n = 27 and 227, respectively). Spearman correlation coefficients (r2) were used to assess the correlation between maternal plasma and breastmilk ARV concentration. Associations between the median effective drug concentration (EC50) and detectable maternal viral load (plasma:>40 copies per milliliter, breastmilk:>56 copies per milliliter) were assessed using mixed-effects models. Cox models were used to estimate the association between maternal or infant plasma drug concentration and breastmilk HIV transmission from 2 to 28 weeks. Results: All ARV compounds exhibited substantial correlations between maternal plasma and breastmilk concentrations (r2: 0.85–0.98, P-value
Source: JAIDS Journal of Acquired Immune Deficiency Syndromes - Category: Infectious Diseases Tags: Clinical Science Source Type: research