Dose-finding Study of BMS-955176 to Treat HIV-1 Infected Treatment-naive Adults

Number of Participants With Plasma HIV-1 RNA < 200 c/mL at Weeks 48 and 96

Blood samples were collected for quantitative analysis of plasma HIV-1 RNA. The antiviral efficacy was determined by the number of participants with plasma HIV-1 RNA \<200 c/mL at Weeks 48 and 96 using the FDA snapshot algorithm. This used the last on-treatment plasma HIV-1 RNA measurement within an FDA-specified visit window to determine response. The analysis was performed using mITT Population (observed), which consisted of participants in the mITT Population excluding participants who had no HIV-1 RNA result data in the assessment visit windows due to discontinuation and who discontinued on or after the date of site notification of study termination by the sponsor (10 October 2016). The data was not collected for Week 96 analysis; as the study was terminated early. Only those participants with data available at the specified time points were analyzed (represented by n=X in category titles).

Time frame: Weeks 48 and 96

Number of Participants With Newly Emergent Genotypic Resistance Using All On-treatment Isolates

The emergence of genotypic resistance among samples selected for drug resistance testing were assessed by searching for all reverse transcriptase substitutions and protease inhibitor substitutions listed in the International Acquired Immunodeficiency Syndrome (AIDS) Society-United States of America (IAS-USA) list of HIV-1 drug resistance mutations. The outcome was originally designed to be assessed up to 96 weeks of treatment, but it was analyzed up to Week 24 as the study was terminated early. The emergence of genotypic resistance is presented for participants in the mITT Population who had Baseline and on-treatment genotypic resistance testing and who had successful sequencing.

Time frame: Week 24

Number of Participants With Newly Emergent Phenotypic Resistance Using All On-treatment Isolates

Phenotypic resistance to a drug is defined as a fold change (i.e., ratio of the 50% inhibitory concentration (IC50) of the clinical isolate to the IC50 of the reference strain) which is greater than the cut-off for reduced susceptibility. Emergent phenotypic resistance to BMS-955176/GSK3532795 was defined as a Baseline fold change IC50\<= 3 and an on-treatment fold change IC50\>3. The number of participants with newly emergent phenotypic resistance is presented for participants in the mITT Population who had Baseline and on-treatment phenotypic resistance testing. The outcome was originally designed to be assessed up to 96 weeks of treatment, but it was analyzed up to Week 24 as the study was terminated early.

Time frame: Week 24

Change From Baseline in Logarithm to the Base 10 (log10) HIV-1 RNA Over Time

Blood samples were collected for analysis of HIV-1 RNA. Values obtained at Day 1 were considered as Baseline value. Change from Baseline was calculated as value at indicated time point minus Baseline value. Change from Baseline in plasma HIV-1 RNA (log10) is summarized over time for the mITT Population using observed values, which excluded participants without HIV-1 RNA result data in the assessment visit windows due to discontinuation and who discontinued on or after the date of site notification of study termination by the sponsor (10 October 2016). Only those participants with data available at the specified time points were analyzed (represented by n=X in the category titles). NA indicates standard deviation could not be calculated as only one participant was analyzed at the specified time point.

Time frame: Baseline (Day 1) and Weeks 2, 4, 8, 12, 16, 24, 32, 40, 48, 60, 72 and 84

Change From Baseline in Cluster of Differentiation (CD)4+ Thymus (T)-Cell Counts Over Time

CD4+ T-cell counts was assessed using flow cytometry. Values obtained at Day 1 were considered as Baseline value. Change from Baseline was calculated as value at indicated time point minus Baseline value. Change from Baseline in CD4+T- cell counts is summarized over time for the mITT Population using observed values, which excluded participants without HIV-1 RNA result data in the assessment visit windows due to discontinuation and who discontinued on or after the date of site notification of study termination by the sponsor (10 October 2016). Only those participants with data available at the specified time points were analyzed (represented by n=X in the category titles). NA indicates standard deviation could not be calculated as only one participant was analyzed at the specified time point.

Time frame: Baseline (Day 1) and Weeks 4, 8, 12, 16, 24, 32, 40, 48, 60, 72 and 84

Change From Baseline in the Percentage of CD4+ T-cells Over Time

CD4+ T-cell counts overall was assessed using flow cytometry. Values obtained at Day 1 were considered as Baseline value. Change from Baseline was calculated as value at indicated time point minus Baseline value. Change from Baseline in percentage of CD4+T- cell counts is summarized over time for the mITT Population using observed values, which excluded participants without HIV-1 RNA result data in the assessment visit windows due to discontinuation and who discontinued on or after the date of site notification of study termination by the sponsor (10 October 2016). Only those participants with data available at the specified time points were analyzed (represented by n=X in the category titles). NA indicates standard deviation could not be calculated as only one participant was analyzed at the specified time point.

Time frame: Baseline (Day 1) and Weeks 4, 8, 12, 16, 24, 32, 40, 48, 60, 72 and 84

Number of Participants With Serious Adverse Events (SAEs) and Adverse Events Leading to Discontinuation (AELD)

Any untoward medical occurrence that at any dose: results in death, is life threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent or significant disability/incapacity, is a congenital anomaly/birth defect, any other situation according to medical or scientific judgment that may not be immediately life-threatening or result in death or hospitalization but may jeopardize the participant or may require medical or surgical intervention were categorized as SAE. Number of participants with SAEs and AELDs is summarized.

Time frame: Up to Week 96

Number of Participants With at Least One Centers for Disease Control (CDC) Class C Events

The occurrence of new AIDS defining events that is CDC class C events is presented.

Time frame: Up to Week 96

Maximum Observed Plasma Concentration (Cmax), Observed Pre-dose Plasma Concentration (C0) and Observed Plasma Concentration at the End of a Dosing Interval (Ctau) of BMS-955176/GSK3532795

Serial blood samples were collected at indicated time points for intensive pharmacokinetic (PK) assessment. The PK assessments were performed on evaluable PK Population, a sub-population which included all treated participants who had adequate PK profiles.

Time frame: Pre-dose (morning) and at 0.5, 1, 1.5, 2, 4, 4.5, 5, 6, 8, 12 (evening pre-dose) and 24 hours (morning pre-dose) at Week 2 (Days 12 to 16)

Time of Maximum Observed Plasma Concentration (Tmax) of BMS-955176/GSK3532795

Serial blood samples were collected at indicated time points for intensive PK assessment.

Time frame: Pre-dose (morning) and 0.5, 1, 1.5, 2, 4, 4.5, 5, 6, 8, 12 (evening pre-dose) and 24 hours (morning pre-dose) at Week 2 (Days 12 to 16)

Area Under the Concentration-time Curve in One Dosing Interval (AUC [Tau]) of BMS-955176/GSK3532795

Serial blood samples were collected at indicated time points for intensive PK assessment.

Time frame: Pre-dose (morning) and at 0.5, 1, 1.5, 2, 4, 4.5, 5, 6, 8, 12 (evening pre-dose) and 24 hours (morning pre-dose) at Week 2 (Days 12 to 16)