alexa Once-daily atazanavir ritonavir compared with twice-daily lopinavir ritonavir, each in combination with tenofovir and emtricitabine, for management of antiretroviral-naive HIV-1-infected patients: 96-week efficacy and safety results of the CASTLE study.
Infectious Diseases

Infectious Diseases

Journal of AIDS & Clinical Research

Author(s): Molina JM, AndradeVillanueva J, Echevarria J, Chetchotisakd P, Corral J, , Molina JM, AndradeVillanueva J, Echevarria J, Chetchotisakd P, Corral J,

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Abstract BACKGROUND: Once-daily atazanavir/ritonavir demonstrated similar antiviral efficacy to twice-daily lopinavir/ritonavir over 48 weeks, with less gastrointestinal disturbance and a better lipid profile, in treatment-naive patients. METHODS: International, multicenter, open-label, 96-week noninferiority randomized trial of atazanavir/ritonavir 300/100 mg once daily vs lopinavir/ritonavir 400/100 mg twice daily, each in combination with fixed-dose tenofovir/emtricitabine 300/200 mg once daily, in antiretroviral-naive, HIV-1-infected patients. The primary end point was the proportion of patients with HIV RNA <50 copies/mL at 48 weeks. Results through 96 weeks are reported. RESULTS: Of 883 patients enrolled, 440 were randomized to atazanavir/ritonavir and 443 to lopinavir/ritonavir. At week 96, more patients receiving atazanavir/ritonavir achieved HIV RNA <50 copies/mL (74\% vs 68\%, P < 0.05) in the intent-to-treat analysis. On both regimens, 7\% of subjects were virologic failures by 96 weeks. Bilirubin-associated disorders were greater in patients taking atazanavir/ritonavir. Treatment-related gastrointestinal adverse events were greater in patients taking lopinavir/ritonavir. Mean changes from baseline in fasting total cholesterol, non-high-density lipoprotein cholesterol, and triglycerides at week 96 were significantly higher with lopinavir/ritonavir (P < 0.0001). CONCLUSIONS: Noninferiority of atazanavir/ritonavir to lopinavir/ritonavir was confirmed at 96 weeks. Atazanavir/ritonavir had a better lipid profile and fewer gastrointestinal adverse events than lopinavir/ritonavir. This article was published in J Acquir Immune Defic Syndr and referenced in Journal of AIDS & Clinical Research

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