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Results Of A Phase 2 Clinical Trial At 48 Weeks (AI424-007): A Dose-Ranging, Safety, And Efficacy Comparative Trial Of Atazanavir At Three Doses In Combination With Didanosine And Stavudine In Antiretroviral-Naive Subjects
Ian Sanne, P. Piliero, K. Squires, A. Thiry, S. Schnittman
Published 2003 · Medicine
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Three dose levels of the protease inhibitor (PI) atazanavir (200, 400, and 500 mg once daily) were compared with nelfinavir (750 mg three times daily) when given both as monotherapy and in combination with didanosine and stavudine in 420 antiretroviral-naive subjects infected with HIV-1. Subjects received monotherapy for 2 weeks, followed by combination therapy for 46 weeks. After 48 weeks, mean change from baseline in HIV RNA (−2.57 to −2.33 log10 copies/mL), the proportion of subjects with HIV RNA <400 copies/mL (56%–64%) and <50 copies/mL (28%–42%), and mean increases in CD4 cell count (185–221 cells/mm3) were comparable across treatment groups. Diarrhea was two to three times more common in the nelfinavir group (61% of subjects) than in the atazanavir groups (23%–30% of subjects, p < .0001 versus nelfinavir), and jaundice occurred only in atazanavir-treated subjects (6%, 6%, and 12% in the 200-, 400-, and 500-mg groups, respectively) (p < .03 for all atazanavir regimens vs. nelfinavir). Mean percent change from baseline in fasting low-density lipoprotein (LDL) cholesterol was significantly less in the atazanavir groups (−7% to 4%) than in the nelfinavir group (31%) (p < .0001). In conclusion, once-daily atazanavir is a potent, safe, and well tolerated PI that rapidly and durably suppresses HIV RNA and durably increases CD4 cell count in antiretroviral-naive subjects. Through 48 weeks, atazanavir was not associated with clinically relevant increases in total cholesterol, fasting LDL cholesterol, or fasting triglycerides. In comparison, nelfinavir was associated with prompt, marked, and sustained elevations in these parameters of a magnitude that suggests they are clinically relevant.
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