Changes in Triglyceride and Other Lipids (Levels of Fats Found in Blood) When Taking Darunavir Compared to Atazanavir in HIV-infected Patients That Have Never Received Treatment

Primary Outcome Measures:

• Change From Baseline in Fasting Triglyceride (TG) Levels in the Lipid Evaluable (LE) Set at Week12 [ Time Frame: Baseline, Week 12 ] [ Designated as safety issue: No ]
  Observed values.
  
  

Secondary Outcome Measures:

• Change From Baseline in Total Cholesterol (TC) Levels in the LE Set at Week 12 and 48 [ Time Frame: Baseline, Week 12 and 48 ] [ Designated as safety issue: No ]
  Observed Values
  
  
• Change From Baseline in Low Density Lipoprotein (LDL) Direct in the LE Set at Week 12 and 48. [ Time Frame: Baseline, Week 12 and 48 ] [ Designated as safety issue: No ]
  Observed Values
  
  
• Change From Baseline in High Density Lipoprotein (HDL) in the LE Set at Week 12 and 48. [ Time Frame: Baseline, Week 12 and 48 ] [ Designated as safety issue: No ]
  Observed Values
  
  
• Change From Baseline in Apolipoprotein A1 in the LE Set at Week 12 and 48. [ Time Frame: Baseline, Week 12 and 48 ] [ Designated as safety issue: No ]
  Observed Values
  
  
• Change From Baseline in Apolipoprotein B in the LE Set at Week 12 and 48. [ Time Frame: Baseline, Week 12 and 48 ] [ Designated as safety issue: No ]
  Observed Values
  
  
• Change From Baseline in TC/HDL Ratio in the LE Set at Week 12 and 48. [ Time Frame: Baseline, Week 12 and 48 ] [ Designated as safety issue: No ]
  Participants TC and HDL was analyzed at Baseline and Week 12 and 48. Change from Baseline at Week 12 and 48 was calculated as ratio using observed values.
  
  
• Change From Baseline in Glucose at Week 12 and 48. [ Time Frame: Baseline, Week 12 and 48 ] [ Designated as safety issue: No ]
  Participants glucose level was analyzed at Baseline and Week 12 and 48. Change from Baseline at Week 12 and 48 was reported.
  
  
• Change From Baseline in Insulin at Week 12 and 48. [ Time Frame: Baseline, Week 12 and 48 ] [ Designated as safety issue: No ]
  Participants insulin was analyzed at Baseline and Week 12 and 48 and change from Baseline at Week 12 and 48 were reported.
  
  
• Change From Baseline in Homeostasis Model Assessment-Insulin Resistance (HOMA-IR) at Week 12 and 48. [ Time Frame: Baseline, Week 12 and 48 ] [ Designated as safety issue: No ]
  Participants homeostasis model assessment-insulin resistance (HOMA-IR) were observed and change from Baseline were reported. HOMA-IR score was calculated as: (fasting plasma glucose*fasting serum insulin)/22.5. Low HOMA IR values indicate high insulin sensitivity and high HOMA IR values indicate low insulin sensitivity (insulin resistance).
  
  
• Antiviral Activity, Human Immunodeficiency Virus Type 1 (HIV-1) RNA. [ Time Frame: Week 12 and 48 ] [ Designated as safety issue: No ]
  Number of Participants with antiviral activity, human immunodeficiency virus Type 1 (HIV-1) RNA less than (<) 50 copies per milliliters (copies/mL) or < 400 copies/mL.
  
  
• Number of Participants With Antiviral Activity, HIV-1 RNA, Missing Values as Treatment Failure (M=F) [ Time Frame: Week 12 and 48 ] [ Designated as safety issue: No ]
  Number of participants with antiviral activity, HIV-1 RNA, missing values as treatment failure (Missing = Failure) were observed.
  
  
• Change From Baseline in HIV-1 RNA Viral Load at Week 12 and 48. [ Time Frame: Baseline, Week 12 and 48 ] [ Designated as safety issue: No ]
  the HIV-1 RNA viral load was calculated using Log Base 10 transformed HIV-1 RNA observed values.
  
  
• Change From Baseline in CD4 Cell Count at Week 12 and 48, Observed Values. [ Time Frame: Baseline, Week 12 and 48 ] [ Designated as safety issue: No ]
  Participants' Cluster of Differentiation (CD) 4 Cell Count were at baseline and the change values at Week 12 and 48 were observed.
  
  
• Change From Baseline in Cluster of Differentiation (CD) 4 Cell Count at Week 12 and 48, Last Observation Carried Forward (LOCF). [ Time Frame: Baseline, Week 12 and 48 ] [ Designated as safety issue: No ]
  Participants' Cluster of Differentiation (CD) 4 Cell Count were observed at baseline and the change values at Week 12 and 48 was calculated using LOCF.
  
  
• Change From Baseline in Cluster of Differentiation (CD) 4 Percent at Week 12 and 48, Last Observation Carried Forward (LOCF). [ Time Frame: Baseline, Week 12 and 48 ] [ Designated as safety issue: No ]
  Participants' Cluster of Differentiation (CD) 4 percent were observed at baseline and the change values at Week 12 and 48 was calculated using LOCF.
  
  

The purpose of this study is to expand our understanding of the metabolic effects of darunavir/ritonavir (DRV/r) in HIV-infected patients. This is a phase 4, multicenter, open-label, randomized (study drug assigned by chance), comparative study designed to compare changes in lipid, glucose, and insulin parameters in HIV-infected, anti-retroviral (ARV) naive patients treated with DRV/r 800/100 mg once daily (QD) versus atazanavir/ritonavir (ATV/r) 300/100 mg QD in combination with a common background of emtricitabine (FTC)/ tenofovir (TDF) 200/300 mg QD. In addition, changes in inflammatory markers will be measured. A substudy of the parent study TMC114HIV4023 will evaluate insulin sensitivity and endothelial function in a subset of patients. The study will be conducted at approximately 16 study sites in the United States. Approximately 60 HIV-1 infected, treatment-naive adult patients will be enrolled in the study. Screening will take place during a 4-week period. At the baseline visit, eligible patients will be randomized in a 1:1 ratio to receive DRV/r 800/100 mg QD or ATV/r 300/100 mg QD administered in combination with a fixed-dose background regimen consisting of emtricitabine (FTC)/tenofovir (TDF) 200/300 mg once daily. The treatment period is 48 weeks. Study assessments will be performed at clinic visits at the end of weeks 4, 8, 12, 24, 36, and 48. The primary endpoint will be assessed at week 12. All patients will return for follow up visits 1 week and 4 weeks after the completion of study treatment. During the treatment period, the patient will be seen at regular visits during which the investigator will assess the patient's medical condition, any Adverse Events and study drug compliance. Laboratory evaluations for efficacy and safety will be done at regular visits as well as blood pressure monitoring. Up to twenty patients (evenly randomized to receive DRV/r or ATV/r) who meet additional entry criteria will be enrolled in the substudy. The study hypothesis is the change in triglycerides and other lipids from baseline to week 12 will be similar in the DRV/r arm versus the ATV/r arm. The substudy hypothesis is that DRV/r will not adversely affect insulin sensitivity or endothelial function during 12 weeks of therapy, and the change from baseline in insulin sensitivity and endothelial function will be similar in the DRV/r arm versus the ATV/r arm. During the treatment period, the patient will be seen at regular visits during which the investigator will assess the patient's medical condition, any Adverse Events and study drug compliance. Laboratory evaluations for efficacy and safety will be done at regular visits as well as blood pressure monitoring. Patients will be randomized in a 1:1 ratio to receive darunavir/ritonavir 800/100 mg once daily (QD) plus emtricitabine (FTC)/tenofovir (TDF) 200/300 mg QD or atazanavir/ritonavir 300/100 mg QD plus emtricitabine (FTC)/tenofovir (TDF) for 48 weeks.