The Danish Protease Inhibitor Study: A Randomized Study Comparing the Virological Efficacy of 3 Protease Inhibitor–Containing Regimens for the Treatment of Human Immunodeficiency Virus Type 1 Infection

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Abstract
The Danish Protease Inhibitor (PI) Study has enrolled 318 human immunodeficiency virus (HIV)—infected, PI-naive patients for the purpose of comparing 3 PI-containing regimens for the treatment of HIV infection. The regimens include 2 nucleoside analogues in combination with indinavir (Idr), ritonavir (Rtv), or Rtv and saquinavir (Rtv/Sqv). Similar percentages of patients in the 3 study arms achieved reduced levels (⩽20 copies/mL) of HIV RNA. In the area under the curve minus baseline analyses, a better response was found in the Rtv/Sqv arm than in the Rtv arm. No difference was found when comparing Rtv/Sqv with Idr and Rtv with Idr. Patients in the 3 arms had comparable increases in CD4 cell counts. At 72 weeks of follow-up, there was no statistical difference between arms for the primary study end point (⩽20 HIV RNA copies/mL); however, some of the additional analyses indicated an advantage for the Rtv/Sqv arm, especially when compared with the Rtv arm.

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