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Integrase strand transfer inhibitors (INSTIs) and tenofovir alafenamide (TAF) have been associated with greater weight gain, though prior analyses may have been confounded by the weight-suppressive effects of efavirenz (EFV) and tenofovir disoproxil fumarate (TDF).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Treatment-naive adults in the North American AIDS Cohort Collaboration on Research and Design initiating ART between 2007 and 2021 were analyzed. Predicted weight change was modeled using linear mixed effects models adjusted for demographic and clinical factors, and nucleoside reverse transcriptase inhibitor (NRTI) backbone, with subanalyses excluding EFV and stratifying by INSTI agent, NRTI, sex, and race.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>A total of 32 514 persons were included. At 2 years, INSTIs (4.9 kg, 95% CI: 4.6\u20135.2) and protease inhibitors (PIs) (4.7 kg, 95% CI: 4.4\u20135.1) were associated with greater mean predicted weight gain compared to non-nucleoside reverse transcriptase inhibitors (NNRTIs) (2.7 kg, 95% CI: 2.4\u20132.9). Differences persisted when limiting analyses to TDF-containing regimens and excluding EFV. Among INSTIs, mean predicted weight gain was numerically highest with bictegravir (6.9 kg, 95% CI: 5.8\u20137.9), followed by dolutegravir (5.3 kg, 95% CI: 4.8\u20135.9), raltegravir (4.5 kg, 95% CI: 3.8\u20135.3), and elvitegravir (4.0 kg, 95% CI: 3.6\u20134.5). Participants receiving TAF with INSTIs gained more than those on TDF. Black females on bictegravir or dolutegravir with TAF had the highest gain at 2 years (10.0 kg, 95% CI: 7.4\u201312.6)<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Weight gain with non-EFV NNRTIs was lower than with PIs and INSTIs, with the greatest increases observed among Black females starting TAF with contemporary INSTIs.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1093\/infdis\/jiag271","type":"journal-article","created":{"date-parts":[[2026,5,28]],"date-time":"2026-05-28T11:43:26Z","timestamp":1779968606000},"page":"352-360","source":"Crossref","is-referenced-by-count":3,"title":["Weight Gain on Contemporary Integrase Strand Transfer Inhibitors and Tenofovir Alafenamide in Persons With HIV Starting Antiretroviral Therapy in the United States and 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