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No advantage for four-drug antiretroviral regimen vs. three-drug for initial treatment of HIV-1

Adding a fourth drug to an antiretroviral regimen for the initial treatment of HIV-1 did not lead to significant differences in reducing HIV levels in the blood, time to virologic failure, adverse events or drug resistance over 3 years, according to a study in the August 16 issue of JAMA, a theme issue on HIV/AIDS.

Roy M. Gulick, M.D., M.P.H., of Weill Medical College of Cornell University, New York, presented the findings of the study today at a JAMA media briefing at the International AIDS Conference in Toronto.

The current standard of care for initial treatment of human immunodeficiency virus 1 (HIV-1) infection is a three-drug antiretroviral regimen, which can suppress viremia (presence of HIV in the blood), increase CD4 cell counts, delay clinical progression, and improve survival, according to background information in the article. Some researchers have suggested that adding drugs to the 3-drug regimens could improve antiretroviral activity. However, additional drugs increase complexity, the potential for toxicity, and costs, and prior studies comparing 3- and 4-drug antiretroviral regimens have shown inconsistent results.

Dr. Gulick and colleagues conducted a study to determine whether a 4-drug regimen would demonstrate better antiretroviral activity than the standard 3-drug regimen. The AIDS Clinical Trials Group (ACTG) A5095 study included 765 HIV-1infected patients who had not previously received treatment for HIV-1. The trial was a randomized, double-blind, placebo-controlled study, with enrollment and follow-up conducted from March 2001 to March 2005. The study participants received either the medications zidovudine/lamivudine plus efavirenz (3-drug regimen) or zidovudine/lamivudine/abacavir plus efavirenz (4-drug regimen).

Overall, 26 percent of 382 patients receiving the 3-drug regimen and 25 percent of 383 receiving the 4-drug regimen reached protocol-defined virologic failure; time to first virologic failure
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Contact: Jonathan Weil
212-821-0566
JAMA and Archives Journals
13-Aug-2006


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