XIX International AIDS Conference


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LBPE19 - Poster Exhibition

Long-term safety and efficacy of raltegravir (RAL)-based versus efavirenz (EFV)-based combination therapy in treatment-naïve HIV-1-infected patients: final 5-year double-blind results from STARTMRK

J. Rockstroh1, E. DeJesus2, M. Saag3, Y. Yazdanpanah4, J. Lennox5, H. Wan6, A. Rodgers6, M. DiNubile6, B.-Y. Nguyen6, H. Teppler6, R. Leavitt6, P. Sklar6

1University of Bonn, Bonn, Germany, 2Orlando Immunology Center, Orlando, United States, 3University of Alabama - Birmingham, Birmingham, United States, 4Hopital Bichat Claude Bernard, Paris, France, 5Emory, Atlanta, United States, 6Merck, Whitehouse Station, United States

Background: As HIV treatment likely involves a lifelong commitment, long-term efficacy & safety data are essential to selecting therapy. STARTMRK, a Phase III trial of RAL- vs. EFV-based therapy in treatment-naïve pts, remained blinded until its conclusion at 5 yrs. We now report the final study results.
Methods: Previously untreated pts without baseline (BL) resistance to EFV, tenofovir (TDF) or emtricitabine (FTC) were eligible for a 5 yr, blinded, randomized study of TDF/FTC plus either RAL (400 mg bid) or EFV (600 mg qhs). Yearly analyses were planned, with primary & secondary endpoints stipulated at Wks 48 & 96. The primary efficacy outcome was the % of pts with vRNA levels < 50 c/mL counting non-completers as failures. Changes from baseline CD4-count used an observed-failure approach to missing data. No formal hypotheses were formulated for testing at Week 240. An implicit fixed-sequence testing procedure was applied to control type I error given the multiple time points for testing non-inferiority; if non-inferiority were established, a subsequent test for superiority was specified in a closed testing fashion.
Results: Overall, 71/281 (25%) RAL & 98/282 (35%) EFV recipients discontinued the study; discontinuations due to clinical adverse events (CAE) occurred in 14 (5%) & 25 (9%) pts in the respective groups. Virologic results are tabulated below. Fewer pts with drug-related (DR) CAEs were reported among RAL (146, 52%) than EFV (226, 80%) recipients (nominal p< 0.001).

Table 1
[Table 1]

Conclusions: In this exploratory analysis of combination therapy with TDF/FTC in treatment-naive pts at Week 240, the vRNA suppression rate was significantly higher with RAL than with EFV. Follow-up at 4 & 5 yrs suggest that RAL/TDF/FTC was superior to EFV/TDF/FTC based on better virologic & immunologic efficacy. Over the entire 5-yr study, RAL-based therapy had a consistently favorable safety profile with less DRAEs compared with EFV-based therapy.

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