A Study of an Investigational Regimen Combining FDA Approved HIV Drugs in HIV-Infected Subjects - Full Text View

Purpose

This is a 24-week study to evaluate the efficacy and safety of a once-daily ritonavir-boosted fosamprenavir regimen (1400mg/100mg QD) to a 200mg ritonavir-boosted fosamprenavir regimen administered either twice-daily or once-daily.

Condition	Intervention	Phase
HIV Infection Infection, Human Immunodeficiency Virus	Drug: Half-boosted Fosamprenavir Drug: Full Boosted Fosamprenavir	Phase 3


Study Type:	Interventional
Study Design:	Allocation: Randomized Intervention Model: Parallel Assignment Masking: Open Label Primary Purpose: Treatment
Official Title:	See Detailed Description.

Resource links provided by NLM:

MedlinePlus related topics: HIV/AIDS

Drug Information available for: Ritonavir Fosamprenavir Fosamprenavir sodium Fosamprenavir calcium

U.S. FDA Resources

Further study details as provided by GlaxoSmithKline:

Primary Outcome Measures:

Percentage of Participants Not Meeting the Definition of Virologic Failure at or Prior to Week 24 [ Time Frame: Week 24 ]
Virologic failure was defined as two consecutive plasma HIV-1 RNA measures greater than 400 copies/milliliter (mL) separated by at least 2 to 4 week. The percentage of participants not meeting the virologic failure definition was estimated with stratification by the six randomization strata using Mantel-Haenszel weights and the missing/discontinuation equals failure (MD=F) analysis. Missing/discontinuation values were considered failures.

Secondary Outcome Measures:

Percentage of Participants With Plasma Human Immunodeficiency Virus, Type 1, Ribonucleic Acid (HIV-1 RNA) <400 Copies/mL at Week 24, Time to Loss of Virologic Response (TLOVR) Analysis [ Time Frame: Week 24 ]
A blood sample was drawn to determine the amount of plasma HIV-1 RNA virus in copies/mL at week 24. The percentage of participants with plasma HIV-1 RNA <400 copies/mL at Week 24 were determined by the TLOVR algorithm with stratification by the six randomization strata.
Percentage of Participants With Plasma HIV-1 RNA <50 Copies/mL at Week 24, TLOVR Analysis [ Time Frame: Week 24 ]
A blood sample was drawn to determine the amount of plasma HIV-1 RNA virus in copies/mL at week 24. The percentage of participants plasma with HIV-1 RNA <50 copies/mL at Week 24 were determined by the TLOVR algorithm with stratification by the six randomization strata.
Mean Change From Baseline of log10 Copies/mL Plasma HIV-1 RNA Levels at Week 24, Observed Analysis [ Time Frame: Baseline and Week 24 ]
A blood sample was drawn to determine the amount of plasma HIV-1 RNA virus in copies/mL at week 24. Change from baseline was defined as plasma HIV-1 RNA level at Week 24 minus plasma HIV-1 RNA level at baseline.
Median Change From Baseline of CD4+ Cell Count at Week 24, Observed Analysis [ Time Frame: Baseline and Week 24 ]
A blood sample was drawn to determine the CD4+ cell count at week 24. Change from baseline was defined as CD4+ cell count at Week 24 minus CD4+ cell count at baseline.
Number of Participants Who Discontinued Treatment Due to Adverse Events Through Week 24 [ Time Frame: Baseline through Week 24 ]
The number of participants who prematurely discontinued study drug due to adverse events was tabulated. Data are summarized by individual adverse event. Adverse events were defined as any untoward medical occurrence in a patient or clinical investigation subject, temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product.
Number of Participants With Grade 2-4 Adverse Events Occurring in Greater Than or Equal to 2% of Subjects Through Week 24 [ Time Frame: Baseline through Week 24 ]
The number of participants who experienced any grades 2 to 4 adverse events was tabulated. Adverse events were graded based on the Division of Acquired Immunodeficiency Syndrome (AIDS) Table for Grading the Severity of Adult and Pediatric Adverse Events.
Percent Change From Baseline in Total Cholesterol, High Density Lipoprotein (HDL), and Triglycerides at Week 24 [ Time Frame: Baseline and Week 24 ]
A blood sample was drawn to determine the cholesterol, HDL, triglycerides levels at Week 24. Percent change in total blood cholesterol, HDL, and triglycerides was defined as (lipid level at Week 24 minus level at baseline) divided by level at baseline x 100%.
Percent Change From Baseline in Low Density Lipoprotein (LDL) at Week 24 [ Time Frame: Baseline and Week 24 ]
A blood sample was drawn to determine the LDL level at Week 24. Percent change in LDL was defined as (LDL level at Week 24 minus level at baseline) divided by level at baseline x 100%.
Number of Participants With Plasma HIV-1 RNA Genotypic Mutations and Phenotypic Resistance at Time of Virologic Failure Not Present at Baseline [ Time Frame: Baseline through Week 24 ]
A blood sample was drawn for subjects failing to respond to therapy and the mutations present in the virus were identified. For each subject, the mutations found at the time of failure were compared with any mutations found in the blood sample at baseline. New mutations that developed at the time of virologic failure were tabulated by drug class.
Steady-State Plasma Levels of Amprenavir (APV) and Ritonavir (RTV) Ctau at Weeks 12 and 24 [ Time Frame: Weeks 12 and 24 ]
Blood samples were drawn at weeks 12 and 24 to determine the plasma levels of APV and RTV. Concentration at the end of the dosing interval at steady state (Ctau) was presented.


Enrollment:	211
Study Start Date:	May 2006
Study Completion Date:	June 2008
Primary Completion Date:	June 2008 (Final data collection date for primary outcome measure)

Arms	Assigned Interventions
Active Comparator: FPV/r200 Fosamprenavir/ritonavir (either 700/100mg BID or 1400/200mg QD)	Drug: Full Boosted Fosamprenavir Full ritonavir-boosted fosamprenavir Other Names: Fosamprenavir ritonavir
Experimental: FPV/r100 Fosamprenavir/ritonavir 1400/100mg QD	Drug: Half-boosted Fosamprenavir Once daily, reduced dose ritonavir-boosted fosamprenavir

Detailed Description:

A Phase IIIB, randomized, open-label, parallel group, multi-center, non-inferiority, 24-week study to evaluate the safety, efficacy and tolerability of switching from a 200mg ritonavir-boosted regimen of LEXIVA (700mg/100mg BID or 1400mg/200mg QD) to a once-daily, 100mg ritonavir-boosted regimen of LEXIVA (1400mg/100mg QD)

Eligibility


Ages Eligible for Study:	18 Years and older (Adult, Senior)
Sexes Eligible for Study:	All
Accepts Healthy Volunteers:	No

Criteria

Inclusion criteria:

Subjects with HIV-1 infection.
Are willing and able to understand and provide written consent prior to participation in this study.

Exclusion criteria:

Are pregnant or breastfeeding.
Have an active AIDS condition, pancreatitis, poor kidney function, or clinically relevant hepatitis.
Have certain medical conditions that may make participation unsafe.
Take medication that may interact with the study medication.
Have a history of allergy to any of the study drugs or any excipients therein.
Other inclusion/exclusion criteria to be evaluated by the physician.

Contacts and Locations

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00363142

Show 51 Study Locations

Sponsors and Collaborators

GlaxoSmithKline

Investigators


Study Director:	GSK Clinical Trials	GlaxoSmithKline

More Information

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):

Cohen C, Dejesus E, Lamarca A, Young B, Yau L, Patel L, Vavro C, Wire MB, Wannamaker P, Shaefer M. Similar virologic and immunologic efficacy with fosamprenavir boosted with 100 mg or 200 mg of ritonavir in HIV-infected patients: results of the LESS trial. HIV Clin Trials. 2010 Sep-Oct;11(5):239-47. doi: 10.1310/hct1105-239.


Responsible Party:	E.D. Derilus; Clinical Disclosure Advisor, GSK Clinical Disclosure
ClinicalTrials.gov Identifier:	NCT00363142 History of Changes
Other Study ID Numbers:	LEX106430
Study First Received:	August 11, 2006
Results First Received:	June 11, 2009
Last Updated:	October 21, 2010

Keywords provided by GlaxoSmithKline:


HIV-1 LEXIVA Ritonavir Once-daily

Additional relevant MeSH terms:


Infection Communicable Diseases HIV Infections Immunologic Deficiency Syndromes Acquired Immunodeficiency Syndrome Lentivirus Infections Retroviridae Infections RNA Virus Infections Virus Diseases Sexually Transmitted Diseases, Viral Sexually Transmitted Diseases Immune System Diseases Slow Virus Diseases	Ritonavir Fosamprenavir HIV Protease Inhibitors Protease Inhibitors Enzyme Inhibitors Molecular Mechanisms of Pharmacological Action Anti-HIV Agents Anti-Retroviral Agents Antiviral Agents Anti-Infective Agents Cytochrome P-450 CYP3A Inhibitors Cytochrome P-450 Enzyme Inhibitors

ClinicalTrials.gov processed this record on June 23, 2017