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"The Once A Day Protease Inhibitor Regimens"

Information source: The University of Texas Health Science Center, Houston
ClinicalTrials.gov processed this data on August 23, 2015
Link to the current ClinicalTrials.gov record.

Condition(s) targeted: HIV Infections

Intervention: ritonavir-boosted atazanavir (Drug); ritonavir-boosted fosamprenavir (Drug)

Phase: Phase 4

Status: Completed

Sponsored by: The University of Texas Health Science Center, Houston

Official(s) and/or principal investigator(s):
Roberto C Arduino, MD, Principal Investigator, Affiliation: The University of Texas Health Science Center, Houston


Atazanavir (ATV) and fosamprenavir (fAPV) are new protease inhibitors that can be administered once-a-day and boosted with ritonavir (r). Prior studies have demonstrated that both are effective in treatment of ARV-na´ve HIV-infected people. This study was designed to demonstrate if a HAART regimen containing ATV/r is not inferior to a HAART regimen containing fAPV/r, in ARV-na´ve patients over a 96-week period. This is a phase IV, single center, randomized, open label, 2-arm clinical trial in ARV therapy-na´ve patients with HIV-1 RNA >1,000 copes/mL and CD4 cell count <350 cells/mm3. Patients will be randomized to receive tenofovir and emtricitabine plus either ATV (300mg qd) and ritonavir (100mg qd) or fAPV (1400mg qd) and ritonavir (200mg qd).

Clinical Details

Official title: "PIQD: The Once a Day Protease Inhibitor Regimens." Ritonavir Boosted Atazanavir vs. Ritonavir Boosted Fosamprenavir Used in Combination With Tenofovir and Emtricitabine in HIV-1 Infected Antiretroviral Treatment-Na´ve Patients.

Study design: Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment

Primary outcome: Proportion of Patient With Viral Load Less Than 400 Copies/mL

Secondary outcome: CD4 Cell Count Change From Baseline During Treatment.

Detailed description: Over the past decade, there have been significant advances toward fighting the progression of HIV disease. Current treatment strategies consist of utilization of potent combination antiretroviral therapy to suppress HIV replication below detectable limits limiting the potential for the emergence of resistant viruses, boosting CD4 cell counts and thereby delaying disease progression. Treatment of HIV-1 infection with Highly Active Antiretroviral Therapy (HAART) regimens containing a protease inhibitor (PI) and two nucleoside reverse transcriptase inhibitor (NRTIs) has been shown to prolong survival and decrease disease progression. Despite these potent antiretroviral agents, current available therapies continue to fail in some patients. Poor adherence to complex treatment regimens remains a significant cause of suboptimal viral suppression leading to emerge of resistant virus. Atazanavir and fosamprenavir were recently FDA approved protease inhibitors. The efficacy and safety profile of these two drugs have been established in clinical trials enrolling antiretroviral therapy naïve and protease inhibitor experienced patients. Atazanavir and fosamprenavir are the only protease inhibitors approved for a once a day regimen and this may set a new standard for treatment of antiretroviral therapy naïve HIV infected patients. Adherence to the medicines, a key component of treatment success, could be significantly improved by using these once daily regimens. However, no head-to-head trials comparing the safety and efficacy of fosamprenavir and atazanavir have been published. This prospective, randomized, open label 2-arm study will compare these two protease inhibitors for therapy of antiretroviral treatment-naïve HIV-infected patients. Patients who are successfully screened for eligibility will be randomized to receive tenofovir and emtricitabine plus either atazanavir (300mg qd) and ritonavir (100mg qd) or fosamprenavir (1400mg qd) and ritonavir (200mg qd). Participants will undergo assessment on day 1 and attend study visits at weeks 6, 12 and every 3 months until the completion of the study on week 96. "Antiretroviral Medication Self-Report" and "3-Day HIV Medication Self-Report" questionnaires will be applied at weeks 6, 12 and every 3 month, thereafter, until week 96. "Changes in Body Appearance" questionnaire will be applied at baseline and weeks 24, 48, 72, and 96.


Minimum age: 18 Years. Maximum age: N/A. Gender(s): Both.


Inclusion Criteria:

- 18 years of age or older.

- Patient agrees to participate in the study by giving written informed consent.

- Documentation of HIV infection.

- No prior treatment with any anti-retroviral agent.

- CD4 cell count < 350 cells x mm3 or with an AIDS defining condition.

- Viral load > 1,000 copies/mL

Exclusion Criteria:

- Less than 18 years old.

- Current pregnancy or breastfeeding.

- Any previous antiretroviral regimen.

- Severe hepatic impairment that precludes the use of either study drug. This will be

defined as any laboratory value of Grade 3 or 4 on the ACTG scale.

- Use of any contra-indicated medication as defined in the package insert for each


- Any condition that, in the judgment of the investigator, precludes successful

participation in the study.

Locations and Contacts

Thomas Street Health Center, Houston, Texas 77009, United States
Additional Information

Related publications:

Murphy RL, Sanne I, Cahn P, Phanuphak P, Percival L, Kelleher T, Giordano M. Dose-ranging, randomized, clinical trial of atazanavir with lamivudine and stavudine in antiretroviral-naive subjects: 48-week results. AIDS. 2003 Dec 5;17(18):2603-14.

Sax PE. Meeting notes from the 2nd International AIDS Society Conference on HIV Pathogenesis and Treatment. Atazanavir in treatment-experienced patients. AIDS Clin Care. 2003 Sep;15(9):78.

Bay├ęs M, Rabasseda X, Prous JR. Gateways to clinical trials. Methods Find Exp Clin Pharmacol. 2003 Jul-Aug;25(6):483-506.

Goldsmith DR, Perry CM. Atazanavir. Drugs. 2003;63(16):1679-93; discussion 1694-5. Review.

Rodriguez-French A, Boghossian J, Gray GE, Nadler JP, Quinones AR, Sepulveda GE, Millard JM, Wannamaker PG. The NEAT study: a 48-week open-label study to compare the antiviral efficacy and safety of GW433908 versus nelfinavir in antiretroviral therapy-naive HIV-1-infected patients. J Acquir Immune Defic Syndr. 2004 Jan 1;35(1):22-32.

SOLO trial results released. AIDS Patient Care STDS. 2003 Feb;17(2):95.

Falcoz C, Jenkins JM, Bye C, Hardman TC, Kenney KB, Studenberg S, Fuder H, Prince WT. Pharmacokinetics of GW433908, a prodrug of amprenavir, in healthy male volunteers. J Clin Pharmacol. 2002 Aug;42(8):887-98.

Vierling P, Greiner J. Prodrugs of HIV protease inhibitors. Curr Pharm Des. 2003;9(22):1755-70. Review.

Mannheimer SB, Matts J, Telzak E, Chesney M, Child C, Wu AW, Friedland G; Terry Beirn Community Programs for Clinical Research on AIDS. Quality of life in HIV-infected individuals receiving antiretroviral therapy is related to adherence. AIDS Care. 2005 Jan;17(1):10-22.

Starting date: May 2004
Last updated: December 12, 2013

Page last updated: August 23, 2015

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