Purpose: Current German/Austrian antiretroviral treatment guidelines recommend more than 20 combination regimens for first-line therapy, without a preference. Regimens include two nucleoside reverse transcriptase inhibitors (NRTIs) plus either an integrase strand transfer inhibitor (INSTI), a non-NRTI (NNRTI) or a boosted protease inhibitor (PI). The objective was to examine the outcomes of recommended first-line ART in Germany.
Methods: This nationwide observational study included treatment-naïve chronically HIV-1 infected patients receiving one of the recommended first-line regimens. Patients were allocated to three arms (INSTI, NNRTI, PI) and were prospectively followed for 24 months. Delayed treatment initiation was defined by a baseline CD4 T-cell count of < 350/µl or CDC clinical stage C.
Results: Among a total of 434 patients enrolled, virologic failure was rare and occurred in 4.3% (6/141) in the PI arm, in 3.3% (4/122) in the NNRTI arm and in 0.6% (1/171) in the INSTI arm (p = 0.10). De novo drug resistance mutations developed in only two patients in the NNRTI arm. Nonetheless, treatment modifications were frequent (51%) and mostly performed for strategic reasons. Retention on all initial compounds at month 24 was 64%, 49%, and 22% in the INSTI, NNRTI and PI arms respectively. Delayed treatment initiation was common (47%) and more frequently observed in patients in the PI arm. It was not associated with virological failure.
Conclusion: High efficacy and low virological failure rates were observed with recommended first-line regimens independent of delayed treatment initiation, chosen regimen and subsequent treatment modifications, demonstrating the validity of the current treatment guidelines.
Keywords: Antiretroviral therapy; Effectiveness; First-line treatment; HIV; Treatment modification.