Dolutegravir-based regimens in treatment-naive and treatment-experienced aging populations: analyses of 6 phase III clinical trials

<b>Background:</b> Older adults living with HIV (OALWH) are a growing population facing unique challenges to successful antiretroviral therapy. <b>Objective:</b> To assess efficacy and safety profiles of antiretroviral regimens, including those containing dolutegravir, in OALWH. <b>Methods:</b> Combined data from 6 phase III/IIIb trials in treatment-naive (ARIA, FLAMINGO, SINGLE, SPRING-2; <i>N</i> = 2634) and treatment-experienced (DAWNING, SAILING; <i>N</i> = 1339) participants receiving dolutegravir- or non–dolutegravir-based regimens were analyzed by age (&lt;50, ≥50 to &lt;65, and ≥65 years). Baseline data included comorbidities and numbers of concomitant medications. Week 48 efficacy outcomes included virologic response (HIV-1 RNA &lt;50 copies/mL) and CD4+ cell count change from baseline. Safety outcomes included incidence of adverse events (AEs), serious AEs, and AE-related withdrawals. <b>Results:</b> Use of ≥5 concomitant medications was more frequently reported among treatment-naive and treatment-experienced participants aged ≥50 to &lt;65 (30% [90/296] and 25% [57/227], respectively) and ≥65 years (43% [10/23] and 29% [4/14]) than among those aged &lt;50 years (13% [310/2315] and 11% [118/1098]). Comorbidities were more prevalent in the older age groups. For dolutegravir-based regimens, Week 48 rates of virologic response and change in CD4+ cell count were similar across age groups (treatment naive, 80–87% and 234–251 cells/mm³; treatment experienced, 70–100% and 105–156 cells/mm³, respectively). There were no major differences in safety outcomes in each age group. <b>Conclusions:</b> In these analyses of combined phase III/IIIb trial data, efficacy and safety of dolutegravir-based regimens were generally similar across age groups in treatment-naive or treatment-experienced participants. Polypharmacy and comorbidities were more common among OALWH than those aged &lt;50 years.