HIV-1 Infection Study of Once a Day Versus Twice a Day Protease Inhibitor in Antiretroviral Treatment Naive Adults

Summary

This is a Phase IIIB, 48 Week, multicentre, randomized, open-label, parallel group study comparing the safety and efficacy of fosamprenavir plus ritonavir 1400mg/100mg once-daily to fosamprenavir plus ritonavir 700mg/100mg twice-daily, both administered with abacavir/lamivudine 600mg/300mg once-daily in antiretroviral-naive HIV-1 infected adults. This study utilizes a group-sequential design with two stages: 1) an interim 24 week cohort analysis of approximately 200 subjects and 2) if study continuation criteria are met at this interim analysis, further enrolment of an additional 528 subjects, followed over a minimum of 48 weeks. The objectives of the study are to demonstrate 1) non-inferior antiviral activity of fosamprenavir/ritonavir 1400mg/100mg QD compared to fosamprenavir/ritonavir 700mg/100mg BID and 2) a superior fasting non-HDL lipid profile in subjects receiving fosamprenavir/ritonavir 1400mg/100mg QD.

Timeline

Start

2007-03

Primary completion

2008-08

Completion

2008-08

Publications

• Background Ross LL, Robinson MD, Carosi G, et al. Impact of HIV subtype on response and resistance in antiretroviral-naïve adults comparing treatment with once daily versus twice daily Ritonavir boosted Fosamprenavir in combination with Abacavir/Lamivudine. [Drugs Ther Stud]. 2012;2(e1):
• Background Carosi G, Lazzarin A, Stellbrink H, et al. Efficacy and Safety of Fosamprenavir + Ritonavir (FPV/RTV) 700mg/100mg Twice Daily (BID) Versus FPV/RTV 1400mg/100mg Once Daily (QD) with ABC/3TC QD over 24 Weeks. Abstract H-1244, 48th Interscience Conference on Antimicrobial Agents and Chemotherapy, Washington, DC, 2008.
• Carosi, Lazzarin, Stellbrink, Moyle, Rugina, Staszewski, Givens, Ross, Granier, Ait-Khaled, Leather, Nichols. Study of once-daily versus twice-daily fosamprenavir plus ritonavir administered with abacavir/lamivudine once daily in antiretroviral-naive HIV-1-infected adult subjects. HIV Clin Trials. 2009 Nov-Dec;10(6):356-67. doi: 10.1310/hct1006-356.
• Hughes S, Cuffe RL, Lieftucht A, Garrett Nichols W. Informing the selection of futility stopping thresholds: case study from a late-phase clinical trial. Pharm Stat. 2009 Jan-Mar;8(1):25-37. doi: 10.1002/pst.323.

Drugs

Indications