alexa Efficacy and safety of tenofovir DF vs stavudine in combination therapy in antiretroviral-naive patients: a 3-year randomized trial.
Pharmaceutical Sciences

Pharmaceutical Sciences

Journal of Pharmacogenomics & Pharmacoproteomics

Author(s): Gallant JE, Staszewski S, Pozniak AL, DeJesus E, Suleiman JM,

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Abstract CONTEXT: Tenofovir disoproxil fumarate (DF) is a once-daily nucleotide analogue reverse transcriptase inhibitor. OBJECTIVE: To evaluate the efficacy and safety of tenofovir DF compared with stavudine in antiretroviral-naive patients. DESIGN, SETTING, AND PARTICIPANTS: A prospective, randomized, double-blind study conducted at 81 centers in the United States, South America, and Europe from June 9, 2000, to January 30, 2004. A total of 753 patients infected with HIV who were antiretroviral naive were screened and 602 patients entered the study. INTERVENTION: Patients were randomized to receive either tenofovir DF (n = 299) or stavudine (n = 303), with placebo, in combination with lamivudine and efavirenz. MAIN OUTCOME MEASURE: Proportion of patients with HIV RNA levels of less than 400 copies/mL at week 48. RESULTS: In the primary intent-to-treat analysis in which patients with missing data or who added or switched antiretroviral medications before week 48 were considered as failures, the proportion of patients with HIV RNA of less than 400 copies/mL at week 48 was 239 (80\%) of 299 in patients receiving tenofovir DF and 253 (84\%) of 301 in patients receiving stavudine (95\% confidence interval, -10.4\% to 1.5\%), exceeding the predefined -10\% limit for equivalence. However, equivalence was demonstrated in the secondary analyses (HIV RNA <50 copies/mL) at week 48 and through 144 weeks. Virologic failure was associated most frequently with efavirenz and lamivudine resistance. Through 144 weeks, the K65R mutation emerged in 8 and 2 patients in the tenofovir DF and stavudine groups, respectively (P =.06). A more favorable mean change from baseline in fasting lipid profile was noted in the tenofovir DF group at week 144: for triglyceride levels (+1 mg/dL for tenofovir DF [n = 170] vs +134 mg/dL for stavudine [n = 162], P<.001), total cholesterol (+30 mg/dL [n = 170] vs +58 mg/dL [n = 162], P<.001), direct low-density lipoprotein cholesterol (+14 mg/dL [n = 169] vs +26 mg/dL [n = 161], P<.001), and high-density lipoprotein cholesterol (+9 mg/dL [n = 168] vs +6 mg/dL [n = 154], P =.003). Investigator-reported lipodystrophy was less common in the tenofovir DF group compared with the stavudine group (9 [3\%] of 299 vs 58 [19\%] of 301, P<.001). The number of bone fractures and the renal safety profile were similar between the 2 groups. CONCLUSIONS: Through 144 weeks, the combination of tenofovir DF, lamivudine, and efavirenz was highly effective and comparable with stavudine, lamivudine, and efavirenz in antiretroviral-naive patients. However, tenofovir DF appeared to be associated with better lipid profiles and less lipodystrophy. This article was published in JAMA and referenced in Journal of Pharmacogenomics & Pharmacoproteomics

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