Background.
Antiretroviral combinations that reduce the number of pills and dosing frequency have the potential to simplify therapy. We compared 2 regimens dosed as 2 pills once daily.
Methods.
This was a randomized, open‐label, multicenter study of tenofovir disoproxil fumarate versus efavirenz, both administered once daily with the abacavir/lamivudine fixed‐dose combination in treatment‐naive human immunodeficiency virus type 1 (HIV‐1)–infected subjects. After reports of early nonresponse, an unplanned interim analysis was performed. Virologic nonresponse was defined as (1) a <2.0‐log10 copies/mL decrease in HIV‐1 RNA level by week 8, (2) an HIV‐1 RNA rebound of
1.0 log10 copies/mL above the nadir, or (3) for subjects with 2 consecutive HIV‐1 RNA measurements <50 copies/mL, a subsequent increase to >400 copies/mL on 2 consecutive occasions.
Conclusion.
The tenofovir disoproxil fumarate/abacavir/lamivudine regimen resulted in an unexpected and unacceptably high rate of nonresponse and incidence of K65R and M184V/I. This 3‐drug regimen should not be used.
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