Expanding Evidence on Pediatric Outcomes of Integrase Strand Transfer Inhibitor Use in Pregnancy
The excellent clinical and virologic efficacy, more rapid achievement of viral suppression, and improved tolerability associated with integrase strand transfer inhibitor (INSTI)–based antiretroviral therapy (ART) compared with nonnucleoside reverse transcriptase inhibitor (NNRTI)– or protease inhibitor (PI)–based ART have led to INSTIs being designated as the preferred option for treatment among children and adults. However, for millions of pregnant women with HIV, the journey toward INSTI access has been challenging. The first-generation INSTI raltegravir has a low resistance threshold and lacks pharmacokinetic data to allow once daily dosing and therefore is recommended as an alternative INSTI in pregnancy.1 Pharmacokinetic data on the INSTI coformulation elvitegravir with cobicistat, emtricitabine, and tenofovir alafenamide fumarate in pregnancy demonstrate suboptimal elvitegravir and cobicistat plasma concentrations during the second and third trimesters, and it is not recommended as an initial regimen in pregnancy.1 For the second-generation INSTI dolutegravir, an initial neural tube defect safety signal with exposure at conception based on small number of exposures led to limited use in pregnancy, but the signal was refuted with expanded data collection. Currently, the second-generation INSTIs dolutegravir and bictegravir are recommended as preferred INSTIs for the initial HIV treatment in pregnancy.1
The dolutegravir safety signal played a critical role in advancing advocacy and global framework for the clinical studies and pharmacovigilance of the antiretroviral drugs and other therapeutic agents in pregnant and breastfeeding women.2 An excellent example of a high-quality postmarketing surveillance research following antiretroviral drug exposure during conception and pregnancy is the study by Williams et al3 from the US-based prospective Pediatric HIV/AIDS Cohort Study (PHACS). The study conducted detailed assessments of cognition, language, and motor development among 1006 infants aged 1 year who were exposed to but uninfected with HIV and whose mothers received ART during pregnancy (531 [52.8%] from conception). The investigators found no clinically meaningful differences in neurodevelopmental outcomes between those with in utero exposure to INSTI- vs NNRTI- or PI-based ART. Importantly, the mean scores in each domain were comparable and close to the standard US population mean (SD) of 100 (50) within each ART exposure group.3
The PHACS study findings3 complement recently published data from the Motheo Study,4 a prospective, observational, longitudinal study of 3 cohorts of children in Botswana designed to evaluate the association of in utero exposure to maternal dolutegravir- or efavirenz-based ART regimens with child neurodevelopmental outcomes at 2 and 5 years of age. The Motheo Study enrolled 404 children exposed to but not infected with HIV and with in utero dolutegravir (n = 202) and efavirenz (n = 202) exposures (179 [89%] and 183 [91%] with preconception treatment and first trimester exposure, respectively) and a control group of 160 children without HIV or ART exposure. Similar to PHACS study results at 1 year of age,3 the neurodevelopmental outcomes among children in Botswana at 2 years of age in these 3 cohorts were comparable, with the exception that efavirenz-exposed children had a slightly higher risk of having a raw score 1 SD below the mean in cognitive and expressive language domains compared with dolutegravir-exposed children.4
To ensure comprehensive assessment of the risks and benefits of antiretroviral drugs, studies of antiretroviral and other drugs in pregnant women need to evaluate both short-term (pregnancy and birth) and long-term (neurodevelopmental, growth, metabolic, and cardiovascular) safety outcomes following maternal, fetal, and infant exposures during conception, pregnancy, and breastfeeding. Currently, pregnancy and birth outcome data on maternal INSTI use are reassuring.1 The PHACS and Motheo studies fill the evidence gap on the long-term consequences of INSTI exposure during conception and pregnancy for the child.5,6 Both studies used similar neurodevelopmental methodologies (PHACS adding or substituting Bayley Scales of Infant and Toddler Development–3rd Edition [Bayley-III] with the MacArthur Bates Communication Development Inventory Words and Gestures Assessment) and had comparable numbers of infants and children with dolutegravir exposure in utero (202 for Motheo and 152 for PHACS). These data support continued use of dolutegravir as a preferred antiretroviral anchor drug for ART treatment regimens in women of child-bearing age or pregnant as recommend in the US and World Health Organization HIV management guidelines.1,7 In the exploratory analysis within the PHACS study, the investigators did not observe an association of any individual INSTI or INSTI exposure overall with Bayley-III cognitive or language domain scores.3 However, data on neurodevelopmental outcomes following in utero bictegravir exposure, most recently moved to the preferred choice in pregnancy in US guidelines, remain scarce and were limited to 45 infants in PHACS cohort.3
Some studies have suggested that infants and children exposed to but not infected with HIV have a heightened risk of subtle impairments in expressive language and gross motor development (but not cognitive, receptive language, or fine motor defects) by 2 years of age compared with HIV-unexposed children.6 In the Matheo study, children exposed to HIV and ART generally performed similarly to HIV-unexposed children on most neurodevelopmental and socioemotional outcomes at 2 years of age. However, children exposed to but not infected with HIV had slightly lower mean gross motor scores and were more likely to have expressive language scores 1 SD below the mean than HIV-unexposed infants.4 When stratifying children exposed to but not infected with HIV by type of ART exposure, those exposed to dolutegravir performed comparably to HIV-unexposed children on all neurodevelopmental measures.4 In utero exposure to efavirenz, however, was associated with a higher risk of adverse cognitive and expressive language outcomes (defined as ≥1 SD below the mean or inability to complete the relevant Bayley-III subtest) compared with dolutegravir exposure, supporting the universal switch from NNRTI-based to dolutegravir-based ART in pregnancy. Within the PHACS study, there was no difference in mean Bayley-III cognitive, language, or motor development domain scores between those exposed to INSTI- vs PI-based ART and only a very small mean difference (approximately 3 points) favoring NNRTI (257 participants, with 41 receiving efavirenz) to INSTI-based ART (389 participants), with the differences attenuated in sensitivity analyses adjusting for maternal CD4 count and viral load.3
While it is reassuring that no association between neurodevelopmental delays and currently used INSTI and other maternal ART regimens has been established, given the availability of new antiretroviral drugs, it is vital to continue exploring both the short-term outcomes and the longer-term developmental trajectories and underlying mechanisms of any delays among children with perinatal HIV and ART exposure. Longitudinal cohort studies incorporating smart research strategies such as modeling and sensitivity analyses as conducted by Williams et al3 and the PHACS investigators are critical to assess risk-benefit ratios of novel antiretroviral drugs, including long-acting injectables and biologics. These studies, however, are only feasible with the collaboration of multiple stakeholders and ongoing and future funding of multidisciplinary, collaborative research involving women with HIV and their children on a global basis.
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Article Information
Published: November 26, 2025. doi:10.1001/jamanetworkopen.2025.45661Open Access: This is an open access article distributed under the terms of the CC-BY License. © 2025 Rakhmanina N et al. JAMA Network Open.Corresponding Author: Natella Rakhmanina, MD, PhD, Division of Infectious Diseases, Childrens’ National Hospital, 111 Michigan Ave NW, West Wing Level 3.5, Ste 100, Washington, DC, 20010 (nrakhman@childrensnational.org).Conflict of Interest Disclosures: Dr Rakhmanina reported receiving research support from ViiV Healthcare, Gilead Sciences Inc, and Chembio Diagnostics outside the submitted work. Dr Mofenson reported receiving consulting fees from the World Health Organization on safety of drugs in pregnancy outside the submitted work. No other disclosures were reported.
References
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