Evaluation of treatment simplification strategies in patients living with HIV with multi-drug resistance.

Background: Patients living with HIV (PLWH) with multi-drug resistance (MDR) and prior episodes of virologic failure have few therapeutic options remaining. These patients are often prescribed 'salvage' antiretroviral therapy (ART) regimens with high pill burdens, leading to potential decreased medication adherence and increased side effects and drug-drug interactions. Materials & Methods: In this retrospective, observational cohort study, we included adult patients with a diagnosis of HIV-1 who received care at our institution's Ryan White Clinic and who received 'salvage' ART, defined as three of more antiretroviral agents from at least three different HIV drug classes. Patients were grouped into two cohorts, simplified ART cohort and non-simplified ART cohort, based on whether their ART regimen was reduced by at least one tablet daily. The primary outcome was the percentage of patients who had their viral load suppressed (HIV-1 RNA <50 copies/ml) at their most recent clinic visit. Secondary outcomes were virologic failure (HIV-1 RNA ⩾200 copies/ml), percentage of time patients were virologically suppressed over the past 2 years, and the emergence of new treatment-resistant mutations. Results: There were 50 patients included in the final analysis, 28 in the simplified ART cohort and 22 in the non-simplified ART cohort. The percentage of patients who had their HIV-1 viral load suppressed at their most recent clinic visit was n = 24 (86%) in the simplified ART cohort and n = 16 (73%) in the non-simplified ART cohort (p = 0.302). There were no statistically significant differences between the two cohorts in terms of the secondary outcomes. Conclusion: Our study found that simplification of ART regimens based on HIV genotype in PLWH with a history of MDR and prior virologic failures, regardless of the presence of HIV-1 viremia at the time of simplification, resulted in similar rates of virologic suppression and virologic failure as non-simplified ART regimens.