A Study to Evaluate Efficacy and Safety of Darunavir/Cobicistat/Emtricitabine/Tenofovir Alafenamide (D/C/F/TAF) Fixed Dose Combination (FDC) Versus a Regimen Consisting of Darunavir/Cobicistat FDC With Emtricitabine/Tenofovir Disoproxil Fumarate FDC in Treatment-naive HIV Type 1 Infected Subjects

Percentage of participants with a HIV-1 RNA < 50 copies per mL were assessed using FDA snapshot approach which defines a participant's virologic response status using only the viral load at the predefined time point within an allowed window of time, along with study drug discontinuation status. The snapshot approach classified participants into 3 outcome categories: 1) virologic success (HIV RNA < 20/50/200 copies per mL at Week 48), 2) virologic failure (HIV RNA greater than or equal to [>=] 20/50/200 copies per mL at Week 48), 3) no viral load data in the Week 48 visit window (discontinued due to adverse event/death/other reason). The missing HIV-1 RNA is considered as non-response.

Percentage of participants with HIV-1 RNA < 20/200 copies per mL using FDA snapshot approach were reported. The snapshot approach classified participants into 3 outcome categories: 1) virologic success (HIV RNA < 20/50/200 copies per mL at Week 48 and 96), 2) virologic failure (HIV RNA >= 20/50/200 copies per mL at Week 48 and 96), 3) no viral load data in the Week 48 and 96 visit window (discontinued due to adverse event/death/other reason). The missing HIV-1 RNA is considered as non-response.

Percentage of participants with HIV-1 RNA less than (<) 20, 50, and 200 copies per mL at Weeks 48 and 96 based on TLOVR algorithm were assessed. TLOVR requires sustained HIV-1 RNA < 50 copies per mL; confirmed HIV-1 RNA >= 50 copies per mL is considered as non-response (rebound); participant is considered non-responder after permanent discontinuation.

Change from baseline in log10 HIV-1 RNA levels were reported.

The immunologic change was determined by changes in Cluster of CD4+ cell count. Change from baseline in CD4+ cell count at Week 48 were assessed.

Change from baseline in serum creatinine at Week 48 was reported.

Change from baseline in eGFRcr was calculated using the CKD-EPI equation as per which Stage 1 (normal or high GFR [>=90 mL/min]); Stage 2 (Mild CKD [60 to 90 mL/min]); Stage 3 (Moderate CKD [30 to 59mL/min]); Stage 4 (Severe CKD [15 to 29 mL/min]); Stage 5 (End Stage CKD [<15 mL/min]). The eGFRcr was assessed by calculating serum creatinine (Scr) using the equation: eGFRcr milliliter per minute per 1.72 meter square (mL/min/1.73m^2) = 144*(Scr/0.7)^-0.329*0.993^age (Scr =< 0.7 mg/dL) and eGFRcr mL/min/1.73m^2 = 144*(Scr/0.7)^-1.209*0.993^age (Scr >0.7 mg/dL) for female participants and eGFRcr mL/min/1.73m^2 = 141*(Scr/0.9)^-0.411*0.993^age (Scr =<0.9 mg/dL) and eGFRcr mL/min/1.73m^2 = 141*(Scr/0.9)^-1.209*0.993^age (Scr >0.9 mg/dL) for male participants.

Change from baseline in eGFRcr by cockcroft-gault formula at Week 48. The eGFRcr was assessed by calculated creatinine clearance (CrCl) using the Cockcroft-Gault formula, and was assessed using CrCl [mL/min] = (140 - A) * W / (72 * C) * R. Where A is age at sample date [years], W is body weight at specific visit (kilogram [kg]), C is the serum concentration of creatinine [mg/dL], R = 1 if the participant is male and = 0.85 if female.

Change from baseline in eGFRcyst was calculated using the CKD-EPI equation as per which Stage 1 (normal or high GFR) >= 90 indicates normal kidney function; Stage 2 (Mild CKD): 60 to 89 mL/min indicates mildly reduced kidney function; Stage 3 (Moderate CKD): 30 to 59 mL/min indicates moderately reduced kidney function; Stage 4 (Severe CKD): 15 to 29 mL/min indicates severely reduced kidney function; Stage 5 (End Stage of CKD): <15 mL/min indicate very severe or end stage kidney failure. The eGFRcyst was assessed by calculated serum cystatin C (Scyst) using the equation: eGFRcyst mL/min/1.73m^2 = 133 * (Scyst/0,8)^-0.499 * 0.996^age [* 0.932 if female] (Scyst =<0.8 mg/L) and eGFRcr mL/min/1.73m^2 = 133 * (Scyst/0,8)^-1.328 * 0.996^age [* 0.932 if male] (Scyst >0.8 mg/L).

AE is any untoward medical occurrence in participant who received study drug without regard to possibility of causal relationship. Events with Grade 3 or higher (3=Severe; 4=life-threatening; 5=fatal) are events that significantly interrupt usual daily activity, require systemic drug therapy/other treatment and are, in many situations, considered unacceptable or intolerable events. SAE is any adverse event (AE) that results in: death, persistent or significant disability/incapacity, requires inpatient hospitalization or prolongation of existing hospitalization, is life-threatening experience, is a congenital anomaly/birth defect and may jeopardize participant and/or may require medical or surgical intervention to prevent one of the outcomes listed above.

Change from baseline in UPCR at Week 48 was reported.

Change from baseline in UACR at Week 48 was reported.

Change from baseline in URBPCR at Week 48 were reported.

Change from baseline in UB2MGCR at Week 48 were reported.

Percent change from baseline in FEPO4 at Week 48 was reported.

AUC (0-24) is the area under the plasma concentration-time curve from time zero to 24 hours post-dose.

C0h is defined as the predose (trough) plasma concentration or concentration just prior to study drug administration.

The AUCtau is the measure of the plasma drug concentration from time zero to end of dosing interval. It is used to characterize drug absorption.

C0-2h is defined as the plasma concentrations 2 hours after dosing.

The BMD is the amount of mineral in gram per square centimeter of bone, which was assessed by dual energy x-ray absorptiometry (DEXA) scan. Positive values are "best values" and negative values are "worst values" of change. Percent change from baseline in hip and spine BMD was assessed.

BMD status was assessed using BMD T-scores; normal bone status was defined by a BMD T-score >= -1, osteopenia by a T-score >= -2.5 to <-1.0, and osteoporosis by a T-score <-2.5.

Change from baseline in ALP at Weeks 24 and 48 was reported.

Change from baseline in serum P1NP at Weeks 24 and 48 were reported.

Change from baseline in serum CTX at Weeks 24 and 48 were reported.

Change from baseline in PTH at Weeks 24 and 48 were reported.

Change from baseline in 25-OH Vitamin D levels at Week 24 and 48 were reported.

Percentage of participants with a HIV-1 RNA < 50 copies per mL were assessed using FDA snapshot approach which defines a participant's virologic response status using only the viral load at the predefined time point within an allowed window of time, along with study drug discontinuation status. The snapshot approach classified participants into 3 outcome categories: 1) virologic success (HIV RNA < 20/50/200 copies per mL at Week 96), 2) virologic failure (HIV RNA greater than or equal to [>=] 20/50/200 copies per mL at Week 96), 3) no viral load data in the Week 96 visit window (discontinued due to adverse event/death/other reason). The missing HIV-1 RNA is considered as non-response.

Change from reference in log10 HIV-1 RNA levels were reported. Here, reference 1 is the comparative phase baseline value in Week 48 analysis for Test group and reference 2 is the last value prior to the switch for Control group.

The immunologic change was determined by changes in cluster of differentiation (CD4+) cell count. Change from reference in CD4+ cell count at Week 96 was assessed. Here, reference 1 is the comparative phase baseline value in Week 48 analysis for test group and reference 2 is the last value prior to the switch for Control group.

Treatment adherence assessed by drug accountability (based on pill count) from start of treatment/switch to last study drug intake by determination of the cumulative treatment adherence in participants who returned all dispensed bottles prior to or at the last visit in the study. Adherent participants were defined as having an adherence >95% as assessed by drug accountability.

AE is any untoward medical occurrence in participant who received study drug without regard to possibility of causal relationship. Events with Grade 3 or higher (3=Severe; 4=life-threatening; 5=fatal) are events that significantly interrupt usual daily activity, require systemic drug therapy/other treatment and are, in many situations, considered unacceptable or intolerable events. SAE is any adverse event (AE) that results in: death, persistent or significant disability/incapacity, requires inpatient hospitalization or prolongation of existing hospitalization, is life-threatening experience, is a congenital anomaly/birth defect and may jeopardize participant and/or may require medical or surgical intervention to prevent one of the outcomes listed above.

Change from reference in serum creatinine was reported. Here, reference 1 is the comparative phase baseline value in Week 48 analysis for test group and reference 2 is the last value prior to the switch for Control group.

Change from reference in eGFRcr was calculated using the CKD-EPI equation as per Stage 1 (normal or high GFR) to Stage 5 (End Stage of CKD). The eGFRcr was assessed by calculating serum creatinine (Scr) using the CKD-EPI equation: eGFRcr milliliter per minute per 1.72 meter square (mL/min/1.73m^2) = 144 * (Scr/0.7)^-0.329 * 0.993^age (Scr =< 0.7 mg/dL) and eGFRcr mL/min/1.73m^2 = 144 * (Scr/0.7)^-1.209 * 0.993^age (Scr >0.7 mg/dL) for female participants and eGFRcr mL/min/1.73m^2 = 141 x (Scr/0.9)^-0.411 x 0.993^age (Scr =<0.9 mg/dL) and eGFRcr mL/min/1.73m^2 = 141 * (Scr/0.9)^-1.209 x 0.993^age (Scr >0.9 mg/dL) for male participants. Here, reference 1 is the comparative phase baseline value in Week 48 analysis for test group and reference 2 is the last value prior to the switch for Control group.

Change from reference in eGFRcr by cockcroft-gault formula was reported. The eGFRcr was assessed by calculated creatinine clearance (CrCl) using the Cockcroft-Gault formula, and was assessed using CrCl [mL/min] = (140 - A) * W / (72 * C) * R. Where A is age at sample date [years], W is body weight at specific visit (kilogram [kg]), C is the serum concentration of creatinine [mg/dL], R = 1 if the participant is male and = 0.85 if female. Here, reference 1 is the comparative phase baseline value in Week 48 analysis for test group and reference 2 is the last value prior to the switch for Control group.

Change from reference in eGFRcyst was calculated using the CKD-EPI equation as per Stage 1 (normal or high GFR) to Stage 5 (End Stage of CKD): <15 mL/min indicate very severe or end stage kidney failure. The eGFRcyst was assessed by calculated serum cystatin C (Scyst) using the CKD-EPI equation: eGFRcyst mL/min/1.73m^2 = 133 * (Scyst/0,8)^-0.499 * 0.996^age [x 0.932 if female] (Scyst =<0.8 mg/L) and eGFRcr mL/min/1.73m^2 = 133 * (Scyst/0,8)^-1.328 * 0.996^age [* 0.932 if male] (Scyst >0.8 mg/L). Here, reference 1 is the comparative phase baseline value in Week 48 analysis for test group and reference 2 is the last value prior to the switch for Control group.

Change from reference in UPCR was reported. Here, reference 1 is the comparative phase baseline value in Week 48 analysis for test group and reference 2 is the last value prior to the switch for Control group.

Change from reference in UACR at Week 96 was reported. Here, reference 1 is the comparative phase baseline value in Week 48 analysis for test group and reference 2 is the last value prior to the switch for Control group.

Change from reference in URBPCR at Week 96 were reported. Here, reference 1 is the comparative phase baseline value in Week 48 analysis for test group and reference 2 is the last value prior to the switch for Control group.

Change from reference in UB2MGCR was reported. Here, reference 1 is the comparative phase baseline value in Week 48 analysis for test group and reference 2 is the last value prior to the switch for Control group.

Percent change from reference in FEPO4 at Week 96 were reported. Here, reference 1 is the comparative phase baseline value in Week 48 analysis for test group and reference 2 is the last value prior to the switch for Control group.

The BMD is the amount of mineral in gram per square centimeter of bone, which was assessed by DEXA scan. Positive values are "best values" and negative values are "worst values" of change. Percent change from reference in hip and spine BMD was assessed. Here, reference 1 is the comparative phase baseline value in Week 48 analysis for test group and reference 2 is the last value prior to the switch for Control group.

BMD status was assessed using BMD T-scores; normal bone status was defined by a BMD T-score >= -1, osteopenia by a T-score >= -2.5 to <-1.0, and osteoporosis by a T-score <-2.5. Here, reference 1 is the comparative phase baseline value in Week 48 analysis for test group and reference 2 is the last value prior to the switch for Control group.

Change from reference in ALP levels at Week 96 was reported. Here, reference 1 is the comparative phase baseline value in Week 48 analysis for test group and reference 2 is the last value prior to the switch for Control group.

Change from reference in serum P1NP levels were reported. Here, reference 1 is the comparative phase baseline value in Week 48 analysis for test group and reference 2 is the last value prior to the switch for Control group.

Change from reference in serum CTX levels were reported. Here, reference 1 is the comparative phase baseline value in Week 48 analysis for test group and reference 2 is the last value prior to the switch for Control group.

Change from reference in PTH levels were reported. Here, reference 1 is the comparative phase baseline value in Week 48 analysis for test group and reference 2 is the last value prior to the switch for Control group.

Change from reference in 25-OH Vitamin D were reported. Here, reference 1 is the comparative phase baseline value in Week 48 analysis for test group and reference 2 is the last value prior to the switch for Control group.

Percentage of participants with HIV RNA <50, <20, and <200 copies/mL post Week 96 to end of extension were reported.

Percentage of participants with PDVF were reported. Protocol-defined virologic failure was defined as having virologic non-response (HIV-1 RNA <1 log10 reduction from baseline and >=50 copies/mL at the Week 8 visit, confirmed at the next visit), virologic rebound (confirmed HIV-1 RNA >=50 copies/mL after confirmed consecutive HIV-1 RNA <50 copies/mL or confirmed >1 log10 increase in HIV-1 RNA from nadir), or viremic at final time point (final available on treatment HIV-1 RNA >=400 copies/mL).

Percentage of participants with PDVF were reported. Protocol-defined virologic failure was defined as having virologic non-response (HIV-1 RNA <1 log10 reduction from baseline and >=50 copies/mL at the Week 8 visit, confirmed at the next visit), virologic rebound (confirmed HIV-1 RNA >=50 copies/mL after confirmed consecutive HIV-1 RNA <50 copies/mL or confirmed >1 log10 increase in HIV-1 RNA from nadir), or viremic at final time point (final available on treatment HIV-1 RNA >=400 copies/mL).

Percentage of participants with non-PDVF by Kaplan-Meier Estimates were reported. PDVF was defined as having virologic non-response (HIV-1 RNA <1 log10 reduction from baseline and >=50 copies/mL at the Week 8 visit, confirmed at the next visit), virologic rebound (confirmed HIV-1 RNA >=50 copies/mL after confirmed consecutive HIV-1 RNA <50 copies/mL or confirmed >1 log10 increase in HIV-1 RNA from nadir), or viremic at final time point (final available on treatment HIV-1 RNA >=400 copies/mL).

Percentage of participants with time to treatment failure by Kaplan-Meier Estimates were reported. Treatment failure was defined as having either protocol-defined virologic failure or having discontinued for reasons other than alternate access to D/C/F/TAF (or other ARVs).

The immunologic change was determined by Cluster of CD4+ cell count. CD4+ cell count post-Week 96 to end of extension were assessed.

Number of participants with DRV, FTC, TDF/TAF resistance were reported.

AE is any untoward medical occurrence in participant who received study drug without regard to possibility of causal relationship. Events with Grade 3 or higher (3=Severe; 4=life-threatening; 5=fatal) are events that significantly interrupt usual daily activity, require systemic drug therapy/other treatment and are, in many situations, considered unacceptable or intolerable events. SAE is any adverse event (AE) that results in: death, persistent or significant disability/incapacity, requires inpatient hospitalization or prolongation of existing hospitalization, is life-threatening experience, is a congenital anomaly/birth defect and may jeopardize participant and/or may require medical or surgical intervention to prevent one of the outcomes listed above.