Skip to content

Attachment Inhibitor Comparison in Heavily Treatment Experienced Patients

A Multi-arm, Phase 3, Randomized, Placebo Controlled, Double Blind Clinical Trial to Investigate the Efficacy and Safety of Fostemsavir (BMS-663068/GSK3684934) in Heavily Treatment Experienced Subjects Infected With Multi-drug Resistant HIV-1 (BRIGHTE Study)

Status
Active, not recruiting
Phases
Phase 3
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT02362503
Enrollment
371
Registered
2015-02-13
Start date
2015-02-23
Completion date
2026-09-30
Last updated
2025-08-22

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

HIV Infections

Brief summary

The purpose of this study is to determine whether the BMS Attachment Inhibitor (BMS-663068) is effective in the treatment of heavily treatment experienced HIV-1 patients with multi-drug resistance.

Interventions

BMS-663068

OTHERPlacebo

Placebo

Sponsors

ViiV Healthcare
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
TRIPLE (Subject, Investigator, Outcomes Assessor)

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Men and non-pregnant women with chronic HIV-1 infection * Antiretroviral-experienced with documented historical or baseline resistance, intolerability, and/or contraindications to antiretrovirals in at least three classes * Failing current antiretroviral regimen with a confirmed plasma HIV-1 RNA ≥ 400 c/mL (first value from Investigator, second from Screening labs) * Must have ≤ 2 classes with at least 1 but no more than 2 fully-active antiretrovirals remaining which can be effectively combined to form a viable new regimen, based on current and/or documented historical resistance testing and tolerability and safety * Able to receive ≥ 1 fully active approved antiretroviral as part of the OBT from Day 9 onwards in the Randomized Cohort * Subjects without any remaining fully active approved antiretroviral may be enrolled in the Non-Randomized Cohort

Exclusion criteria

* Chronic untreated Hepatitis B virus (HBV) (however, patients with chronic treated HBV are eligible) * HIV-2 infection * Alanine aminotransferase (ALT) or aspartate aminotransferase (AST) \> 7 x ULN * Alkaline Phosphatase \> 5 x ULN * Bilirubin ≥ 1.5 x Upper limit of normal (ULN) (unless subject is currently on atazanavir and has predominantly unconjugated hyperbilirubinemia)

Design outcomes

Primary

MeasureTime frameDescription
Mean Change in Logarithm to the Base 10 (log10) HIV-1 Ribonucleic Acid (RNA) From Day 1 at Day 8-Randomized CohortDay 1 and Day 8Plasma samples were collected for analysis of HIV-1 RNA. Mean change in log10 HIV-1 RNA from Day 1 was estimated using analysis of covariance (ANCOVA) with log10 HIV-1 RNA change from Day 1 at Day 8 as dependent variable, treatment (fostemsavir or placebo) as an independent variable, and Day 1 log10 HIV-1 RNA as a continuous covariate. Change from Day 1 was calculated as value at Day 8 minus value at Day 1. The analysis was performed on Intent-to-Treat Exposed (ITT-E) Population which comprised of all randomized participants who received at least one dose of study treatment. Missing HIV-1 RNA values at Day 8 were imputed using (a) Day 1 Observation Carried Forward (D1OCF) for participants without a value during blinded treatment (i.e, imputing a zero change from Day 1) or (b) Last Observation Carried Forward (LOCF) for participants with an early value during blinded treatment before the Day 8 analysis visit window.

Secondary

MeasureTime frameDescription
Percentage of Participants With HIV-1 RNA <40 c/mL at Weeks 24, 48 and 96-Randomized CohortAt Weeks 24, 48 and 96The durability of response (that is, the number of participants achieving HIV-1 RNA \<40 c/mL) at Weeks 24, 48 and 96 of open-label fostemsavir plus OBT in the Randomized Cohort was assessed using the Food and Drug Administration (FDA) snapshot algorithm in which participants without HIV-1 RNA at Weeks 24, 48 and 96 or those who changed OBT due to lack of efficacy through Weeks 24, 48 and 96 were counted as failures. The percentage of participants in the Randomized Cohort who achieved virologic success (HIV-1 RNA \<40 c/mL) at Weeks 24, 48 and 96 is presented along with 95% Wilson confidence interval. All the participants received fostemsavir during the open-label period irrespective of the original arms to which they were randomized; hence, the combined totals for Randomized Cohort is presented as pre-specified in protocol and reporting and analysis plan.
Number of Participants With On-treatment Serious Adverse Events (SAEs) and Adverse Events (AEs) Leading to Discontinuation (AELD)-Randomized CohortUp to Week 96 analysis cut-off dateAn SAE is any untoward medical occurrence that at any dose: results in death; is life-threatening; requires inpatient hospitalization or causes prolongation of existing hospitalization; results in persistent or significant disability/incapacity; is a congenital anomaly/birth defect; an important medical event that may jeopardize the participant or require intervention. Number of participants with on-treatment SAEs and AEs leading to withdrawal of study treatment is presented. SAEs and AELDs were collected in Safety Population which comprised of all participants who received at least one dose of study treatment. All the participants received fostemsavir during the open-label period irrespective of the original arms to which they were randomized; hence, the combined totals for Randomized Cohort is presented as pre-specified in protocol and reporting and analysis plan.
Number of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortBaseline and up to Week 96 analysis cut-off dateLaboratory toxicities were graded for severity according to the Division of Acquired Immunodeficiency Syndrome (DAIDS) grading system: Grade 1 (mild); Grade 2 (moderate); Grade 3 (severe); Grade 4 (potentially life-threatening). Baseline is defined as the latest pre-dose assessment. The number of participants with clinical chemistry toxicity grade increase to Grade 3-4 at anytime post-Baseline relative to Baseline is presented. All the participants received fostemsavir during the open-label period irrespective of the original arms to which they were randomized; hence, the combined totals for Randomized Cohort is presented as pre-specified in protocol and reporting and analysis plan.
Number of Participants With Toxicity Grade Increase in Hematology Results to Grade 3-4 Relative to Baseline-Randomized CohortBaseline and up to Week 96 analysis cut-off dateLaboratory toxicities were graded for severity according to the DAIDS grading system: Grade 1 (mild); Grade 2 (moderate); Grade 3 (severe); Grade 4 (potentially life-threatening). Baseline is defined as the latest pre-dose assessment. The number of participants with hematology toxicity grade increase to Grade 3-4 at anytime post-Baseline relative to Baseline is presented. All the participants received fostemsavir during the open-label period irrespective of the original arms to which they were randomized; hence, the combined totals for Randomized Cohort is presented as pre-specified in protocol and reporting and analysis plan.
Number of Participants With Centers for Disease Control (CDC) Class C Events-Randomized CohortUp to Week 96 analysis cut-off dateDisease progression during open label fostemsavir plus OBT was assessed based on the occurrence of new AIDS defining events (CDC Class C events) or death. The number of participants with on-treatment CDC Class C AIDS events is presented. All the participants received fostemsavir during the open-label period irrespective of the original arms to which they were randomized; hence, the combined totals for Randomized Cohort is presented as pre-specified in protocol and reporting and analysis plan.
Change From Day 1 in Cluster of Differentiation (CD) 4+ T-cell Count at Day 8-Randomized CohortDay 1 and Day 8CD4+ T- cell counts were assessed by flow cytometry. Mean change in CD4+ T- cell count from Day 1 at Day 8 was analyzed using one-way ANCOVA with change of CD4+ cell counts from Day 1 at Day 8 as the dependent variable, treatment (fostemsavir or placebo) as an in-dependent variable, and Day 1 CD4+ cell count as a continuous covariate. Change from Day 1 was calculated as value at Day 8 minus value at Day 1. Missing CD4+ cell count values at Day 8 were imputed using (a) D1OCF for participants without a value during blinded treatment (i.e., imputing a zero change from Day 1), or (b) LOCF for participants with an early value during blinded treatment before the Day 8 analysis visit window.
Percentage of Participants With HIV-1 RNA Decreases From Day 1 That Exceed 0.5 log10 c/mL and 1.0 log10 c/mL at Day 8-Randomized CohortDay 1 and Day 8The percentage of participants in the Randomized Cohort with HIV-1 RNA decreases from Day 1 that exceed 0.5 log10 c/mL and 1.0 log10 c/mL at Day 8 was determined by comparing HIV-1 RNA Day 1 measurement of each participant to their Day 8 measurement. This was an ITT analysis that classified participants without HIV-1 RNA at Day 1 or Day 8 as failures. The percentage of responders along with 95% confidence interval based on Wilson score is presented.
Change From Baseline in log10 HIV-1 RNA for Fostemsavir When Given With OBT Through Week 96-Randomized CohortBaseline and at Day 8, Weeks 4, 8, 12, 16, 24, 36, 48, 60, 72, 84 and 96Blood samples were collected for the analysis of HIV-1 RNA. Baseline is defined as the last non-missing value on or before the date of first dose of study treatment. Change from Baseline was calculated as the value at post-dose visit minus the value at Baseline. All the participants received fostemsavir during the open-label period irrespective of the original arms to which they were randomized; hence, the combined totals for Randomized Cohort is presented as pre-specified in protocol and reporting and analysis plan.
Change From Baseline in CD4+ T- Cell Count Through Week 96-Randomized CohortBaseline and at Day 8, Weeks 4, 8, 12, 16, 24, 36, 48, 60, 72, 84 and 96CD4+ T- cell counts were assessed by flow cytometry. Baseline is defined as the last non-missing value on or before the date of first dose of study treatment. Change from Baseline was calculated as the value at post-dose visit minus the value at Baseline.
Change From Baseline in CD4+ T- Cell Count Percentage Through Week 96Baseline and at Day 8, Weeks 4, 8, 12, 16, 24, 36, 48, 60, 72, 84 and 96Percentage CD4+ T- cell counts were assessed by flow cytometry. Baseline is defined as the last non-missing value on or before the date of first dose of study treatment. Change from Baseline was calculated as the value at post-dose visit minus the value at Baseline.
Number of Participants With Treatment-emergent Viral Genotypic Substitution of Interest in the GP160 Domain as a Measure of Genotypic Resistance-Randomized CohortWeek 96Plasma samples were collected for emergent drug resistance testing. The number of participants with emergent viral genotypic substitutions of interest in the GP160 domain was identified by the next-generation sequencing (NGS) assay. Protocol defined virologic failure (PDVF) through Week 96 Population comprised of all participants with available phenotypic and genotypic resistance data meeting at the time protocol defined virologic failure (PDVF) was met. The criteria for PDVF was a) Confirmed, or last available prior to discontinuation, HIV-1 RNA \>=400 c/mL at any time after prior confirmed suppression to \<400 c/mL prior to Week 24 or Confirmed, or last available prior to discontinuation, \> 1 log10 c/mL increase in HIV-1 RNA at any time above nadir level where nadir is \>=40 c/mL prior to Week 24. b) Confirmed, or last available prior to discontinuation, HIV-1 RNA \>=400 c/mL at or after Week 24.
Number of Participants With Indicated Fold Change Ratio (FCR) Using the Monogram PhenoSense Entry Assay-Randomized CohortWeek 96The phenotypic resistance to a drug is defined in terms of a fold change (FC) in IC50s, i.e., the ratio of the 50% inhibitory concentration (IC50) of the clinical isolate to the IC50 of a reference strain (wild type control). FCR was calculated as FC at PDVF divided by Baseline FC. The number of participants with the indicated change (ratio) in the two values at the time of PDVF is presented. FCR\<1 indicates that FC is smaller on-treatment than at Baseline. FCR \>3 indicates that on-treatment FC is 3 times greater than it was at Baseline.
Change in CD4+ T- Cell Count Percentage From Day 1 at Day 8-Randomized CohortDay 1 and Day 8CD4+ T- cell counts were assessed by flow cytometry. Mean change in CD4+ T- cell count percentage from Day 1 at Day 8 was analyzed using one-way ANCOVA with change of CD4+ cell count percentage from Day 1 at Day 8 as the dependent variable, treatment (fostemsavir or placebo) as an independent variable, and Day 1 CD4+ cell count percentage as a continuous covariate. Change from Day 1 was calculated as value at Day 8 minus value at Day 1. Missing CD4+ cell count values at Day 8 were imputed using (a) D1OCF for participants without a value during blinded treatment (ie, imputing a zero change from Day 1), or (b) LOCF for participants with an early value during blinded treatment before the Day 8 analysis visit window.

Countries

Argentina, Australia, Belgium, Brazil, Canada, Chile, Colombia, France, Germany, Greece, Ireland, Italy, Mexico, Netherlands, Peru, Poland, Portugal, Puerto Rico, Romania, Russia, South Africa, Spain, Taiwan, United Kingdom, United States

Participant flow

Recruitment details

This was a 2 cohort Phase 3 study conducted in heavily treatment experienced (HTE) participants infected with multi-drug resistant human immunodeficiency virus (HIV)-1. Participants were assigned to either the Randomized Cohort (participants received either fostemsavir or placebo) or Non-randomized Cohort (all participants received fostemsavir).

Pre-assignment details

A total of 731 participants were screened, of which 371 were included in either Randomized Cohort or Non-randomized Cohort and received at least one dose of study treatment. The results presented are based on Week 96 interim analysis. Data collection is still on-going and additional results will be provided after study completion.

Participants by arm

ArmCount
Randomized Cohort-Placebo
Eligible participants in the Randomized Cohort had one to two fully active antiretrovirals remaining at Baseline. Participants received placebo twice daily (BID) along with their currently failing antiretroviral regimen for 8 days during the randomized, double-blind period. During the open-label period, all participants received fostemsavir 600 mg BID with an optimized background therapy (OBT).
69
Randomized Cohort-fostemsavir 600 mg BID
Eligible participants in the Randomized Cohort had one to two fully active antiretrovirals remaining at Baseline. Participants received fostemsavir 600 milligram (mg) BID along with currently failing antiretroviral regimen for 8 days during the randomized, double-blind period. During the open-label period, all participants continued to receive fostemsavir 600 mg BID with an OBT.
203
Non-randomized Cohort-fostemsavir 600 mg BID-Open Label Period
Eligible participants in the Non-randomized Cohort had zero remaining fully active and approved antiretroviral regimens at Baseline. Participants received fostemsavir 600 mg BID in combination with OBT.
99
Total371

Withdrawals & dropouts

PeriodReasonFG000FG001FG002
Double-blind Period-Up to 8 DaysAdverse Event020
Double-blind Period-Up to 8 DaysDeath100
Double-blind Period-Up to 8 DaysLost to Follow-up010
Double-blind Period-Up to 8 DaysNo longer meets study criteria010
Open Label Period-Up to 96 WeeksAdverse Event324
Open Label Period-Up to 96 WeeksDeath1715
Open Label Period-Up to 96 WeeksLack of Efficacy396
Open Label Period-Up to 96 WeeksLost to Follow-up431
Open Label Period-Up to 96 WeeksNo longer meets criteria044
Open Label Period-Up to 96 WeeksNon-compliance with study drug386
Open Label Period-Up to 96 WeeksOngoing at the time of analysis5415961
Open Label Period-Up to 96 WeeksOther011
Open Label Period-Up to 96 WeeksPregnancy010
Open Label Period-Up to 96 WeeksWithdrawal by Subject051

Baseline characteristics

CharacteristicRandomized Cohort-PlaceboRandomized Cohort-fostemsavir 600 mg BIDNon-randomized Cohort-fostemsavir 600 mg BID-Open Label PeriodTotal
Age, Continuous43.0 Years
STANDARD_DEVIATION 11.02
45.2 Years
STANDARD_DEVIATION 12.72
48.1 Years
STANDARD_DEVIATION 11.53
45.6 Years
STANDARD_DEVIATION 12.2
Race/Ethnicity, Customized
Race customized
American Indian or Alaska Native
1 Participants6 Participants1 Participants8 Participants
Race/Ethnicity, Customized
Race customized
Asian
0 Participants2 Participants0 Participants2 Participants
Race/Ethnicity, Customized
Race customized
Black or African American
18 Participants42 Participants23 Participants83 Participants
Race/Ethnicity, Customized
Race customized
Brown
0 Participants2 Participants0 Participants2 Participants
Race/Ethnicity, Customized
Race customized
Hispanic
0 Participants2 Participants0 Participants2 Participants
Race/Ethnicity, Customized
Race customized
Mestizo
1 Participants2 Participants0 Participants3 Participants
Race/Ethnicity, Customized
Race customized
Mixed
1 Participants6 Participants1 Participants8 Participants
Race/Ethnicity, Customized
Race customized
Mulatto
0 Participants1 Participants0 Participants1 Participants
Race/Ethnicity, Customized
Race customized
Native Hawaiian or other Pacific islander
0 Participants1 Participants0 Participants1 Participants
Race/Ethnicity, Customized
Race customized
North African
0 Participants1 Participants0 Participants1 Participants
Race/Ethnicity, Customized
Race customized
White
48 Participants137 Participants74 Participants259 Participants
Race/Ethnicity, Customized
Race customized
White and African descent
0 Participants1 Participants0 Participants1 Participants
Sex: Female, Male
Female
12 Participants60 Participants10 Participants82 Participants
Sex: Female, Male
Male
57 Participants143 Participants89 Participants289 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
EG002
affected / at risk
EG003
affected / at risk
EG004
affected / at risk
deaths
Total, all-cause mortality
2 / 6910 / 20317 / 9912 / 27129 / 370
other
Total, other adverse events
16 / 6945 / 20392 / 99214 / 271306 / 370
serious
Total, serious adverse events
2 / 694 / 20348 / 9992 / 271140 / 370

Outcome results

Primary

Mean Change in Logarithm to the Base 10 (log10) HIV-1 Ribonucleic Acid (RNA) From Day 1 at Day 8-Randomized Cohort

Plasma samples were collected for analysis of HIV-1 RNA. Mean change in log10 HIV-1 RNA from Day 1 was estimated using analysis of covariance (ANCOVA) with log10 HIV-1 RNA change from Day 1 at Day 8 as dependent variable, treatment (fostemsavir or placebo) as an independent variable, and Day 1 log10 HIV-1 RNA as a continuous covariate. Change from Day 1 was calculated as value at Day 8 minus value at Day 1. The analysis was performed on Intent-to-Treat Exposed (ITT-E) Population which comprised of all randomized participants who received at least one dose of study treatment. Missing HIV-1 RNA values at Day 8 were imputed using (a) Day 1 Observation Carried Forward (D1OCF) for participants without a value during blinded treatment (i.e, imputing a zero change from Day 1) or (b) Last Observation Carried Forward (LOCF) for participants with an early value during blinded treatment before the Day 8 analysis visit window.

Time frame: Day 1 and Day 8

Population: ITT-E Population. Participants with missing Day 1 HIV-1 RNA values were not analyzed.

ArmMeasureValue (LEAST_SQUARES_MEAN)
Randomized Cohort-PlaceboMean Change in Logarithm to the Base 10 (log10) HIV-1 Ribonucleic Acid (RNA) From Day 1 at Day 8-Randomized Cohort-0.166 Log10 copies per milliliter (c/mL)
Randomized Cohort-fostemsavir 600 mg BIDMean Change in Logarithm to the Base 10 (log10) HIV-1 Ribonucleic Acid (RNA) From Day 1 at Day 8-Randomized Cohort-0.791 Log10 copies per milliliter (c/mL)
p-value: <0.000195% CI: [-0.81, -0.441]ANCOVA
Secondary

Change From Baseline in CD4+ T- Cell Count Percentage Through Week 96

Percentage CD4+ T- cell counts were assessed by flow cytometry. Baseline is defined as the last non-missing value on or before the date of first dose of study treatment. Change from Baseline was calculated as the value at post-dose visit minus the value at Baseline.

Time frame: Baseline and at Day 8, Weeks 4, 8, 12, 16, 24, 36, 48, 60, 72, 84 and 96

Population: ITT-E Population. Only those participants with data available at the specified time points were analyzed (represented by n=X in category titles).

ArmMeasureGroupValue (MEAN)Dispersion
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Percentage Through Week 96Week 12; n=2493.00 Percentage of CD4+ T- cellsStandard Deviation 4.945
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Percentage Through Week 96Day 8; n=2550.75 Percentage of CD4+ T- cellsStandard Deviation 1.97
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Percentage Through Week 96Week 4; n=2592.30 Percentage of CD4+ T- cellsStandard Deviation 4.643
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Percentage Through Week 96Week 8; n=2542.36 Percentage of CD4+ T- cellsStandard Deviation 4.392
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Percentage Through Week 96Week 16; n=2453.51 Percentage of CD4+ T- cellsStandard Deviation 4.979
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Percentage Through Week 96Week 24; n=2474.26 Percentage of CD4+ T- cellsStandard Deviation 4.828
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Percentage Through Week 96Week 36; n=2345.06 Percentage of CD4+ T- cellsStandard Deviation 5.256
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Percentage Through Week 96Week 48; n=2286.51 Percentage of CD4+ T- cellsStandard Deviation 5.531
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Percentage Through Week 96Week 60; n=2157.00 Percentage of CD4+ T- cellsStandard Deviation 5.94
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Percentage Through Week 96Week 72; n=2177.02 Percentage of CD4+ T- cellsStandard Deviation 5.726
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Percentage Through Week 96Week 84; n=2037.68 Percentage of CD4+ T- cellsStandard Deviation 5.798
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Percentage Through Week 96Week 96; n=2138.44 Percentage of CD4+ T- cellsStandard Deviation 6.409
Secondary

Change From Baseline in CD4+ T- Cell Count Through Week 96-Randomized Cohort

CD4+ T- cell counts were assessed by flow cytometry. Baseline is defined as the last non-missing value on or before the date of first dose of study treatment. Change from Baseline was calculated as the value at post-dose visit minus the value at Baseline.

Time frame: Baseline and at Day 8, Weeks 4, 8, 12, 16, 24, 36, 48, 60, 72, 84 and 96

Population: ITT-E Population. Only those participants with data available at the specified time points were analyzed (represented by n=X in category titles).

ArmMeasureGroupValue (MEAN)Dispersion
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Through Week 96-Randomized CohortDay 8; n=25519.8 Cells per cubic millimeterStandard Deviation 60.98
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Through Week 96-Randomized CohortWeek 4; n=25948.9 Cells per cubic millimeterStandard Deviation 131.75
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Through Week 96-Randomized CohortWeek 8; n=25461.5 Cells per cubic millimeterStandard Deviation 113.47
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Through Week 96-Randomized CohortWeek 12; n=24979.0 Cells per cubic millimeterStandard Deviation 123.31
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Through Week 96-Randomized CohortWeek 16; n=24584.1 Cells per cubic millimeterStandard Deviation 107.26
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Through Week 96-Randomized CohortWeek 24; n=24790.4 Cells per cubic millimeterStandard Deviation 112.1
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Through Week 96-Randomized CohortWeek 36; n=234109.7 Cells per cubic millimeterStandard Deviation 119.5
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Through Week 96-Randomized CohortWeek 48; n=228138.9 Cells per cubic millimeterStandard Deviation 135.06
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Through Week 96-Randomized CohortWeek 60; n=215162.9 Cells per cubic millimeterStandard Deviation 157.69
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Through Week 96-Randomized CohortWeek 72; n=217172.1 Cells per cubic millimeterStandard Deviation 184.81
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Through Week 96-Randomized CohortWeek 84; n=203190.8 Cells per cubic millimeterStandard Deviation 165.63
Randomized Cohort-PlaceboChange From Baseline in CD4+ T- Cell Count Through Week 96-Randomized CohortWeek 96; n=213204.7 Cells per cubic millimeterStandard Deviation 191.28
Secondary

Change From Baseline in log10 HIV-1 RNA for Fostemsavir When Given With OBT Through Week 96-Randomized Cohort

Blood samples were collected for the analysis of HIV-1 RNA. Baseline is defined as the last non-missing value on or before the date of first dose of study treatment. Change from Baseline was calculated as the value at post-dose visit minus the value at Baseline. All the participants received fostemsavir during the open-label period irrespective of the original arms to which they were randomized; hence, the combined totals for Randomized Cohort is presented as pre-specified in protocol and reporting and analysis plan.

Time frame: Baseline and at Day 8, Weeks 4, 8, 12, 16, 24, 36, 48, 60, 72, 84 and 96

Population: ITT-E Population. Only those participants with data available at the specified time points were analyzed (represented by n=X in category titles).

ArmMeasureGroupValue (MEAN)Dispersion
Randomized Cohort-PlaceboChange From Baseline in log10 HIV-1 RNA for Fostemsavir When Given With OBT Through Week 96-Randomized CohortWeek 8; n=256-2.207 Log10 c/mLStandard Deviation 1.1416
Randomized Cohort-PlaceboChange From Baseline in log10 HIV-1 RNA for Fostemsavir When Given With OBT Through Week 96-Randomized CohortDay 8; n=262-0.656 Log10 c/mLStandard Deviation 0.7536
Randomized Cohort-PlaceboChange From Baseline in log10 HIV-1 RNA for Fostemsavir When Given With OBT Through Week 96-Randomized CohortWeek 4; n=262-2.051 Log10 c/mLStandard Deviation 1.0717
Randomized Cohort-PlaceboChange From Baseline in log10 HIV-1 RNA for Fostemsavir When Given With OBT Through Week 96-Randomized CohortWeek 12; n=248-2.237 Log10 c/mLStandard Deviation 1.2105
Randomized Cohort-PlaceboChange From Baseline in log10 HIV-1 RNA for Fostemsavir When Given With OBT Through Week 96-Randomized CohortWeek 16; n=249-2.277 Log10 c/mLStandard Deviation 1.2834
Randomized Cohort-PlaceboChange From Baseline in log10 HIV-1 RNA for Fostemsavir When Given With OBT Through Week 96-Randomized CohortWeek 24; n=246-2.297 Log10 c/mLStandard Deviation 1.2788
Randomized Cohort-PlaceboChange From Baseline in log10 HIV-1 RNA for Fostemsavir When Given With OBT Through Week 96-Randomized CohortWeek 36; n=238-2.332 Log10 c/mLStandard Deviation 1.2265
Randomized Cohort-PlaceboChange From Baseline in log10 HIV-1 RNA for Fostemsavir When Given With OBT Through Week 96-Randomized CohortWeek 48; n=233-2.324 Log10 c/mLStandard Deviation 1.2876
Randomized Cohort-PlaceboChange From Baseline in log10 HIV-1 RNA for Fostemsavir When Given With OBT Through Week 96-Randomized CohortWeek 60; n=223-2.419 Log10 c/mLStandard Deviation 1.1973
Randomized Cohort-PlaceboChange From Baseline in log10 HIV-1 RNA for Fostemsavir When Given With OBT Through Week 96-Randomized CohortWeek 72; n=221-2.427 Log10 c/mLStandard Deviation 1.1542
Randomized Cohort-PlaceboChange From Baseline in log10 HIV-1 RNA for Fostemsavir When Given With OBT Through Week 96-Randomized CohortWeek 84; n=215-2.455 Log10 c/mLStandard Deviation 1.193
Randomized Cohort-PlaceboChange From Baseline in log10 HIV-1 RNA for Fostemsavir When Given With OBT Through Week 96-Randomized CohortWeek 96; n=214-2.476 Log10 c/mLStandard Deviation 1.1984
Secondary

Change From Day 1 in Cluster of Differentiation (CD) 4+ T-cell Count at Day 8-Randomized Cohort

CD4+ T- cell counts were assessed by flow cytometry. Mean change in CD4+ T- cell count from Day 1 at Day 8 was analyzed using one-way ANCOVA with change of CD4+ cell counts from Day 1 at Day 8 as the dependent variable, treatment (fostemsavir or placebo) as an in-dependent variable, and Day 1 CD4+ cell count as a continuous covariate. Change from Day 1 was calculated as value at Day 8 minus value at Day 1. Missing CD4+ cell count values at Day 8 were imputed using (a) D1OCF for participants without a value during blinded treatment (i.e., imputing a zero change from Day 1), or (b) LOCF for participants with an early value during blinded treatment before the Day 8 analysis visit window.

Time frame: Day 1 and Day 8

Population: ITT-E Population. Only those participants with data available at the specified time points were analyzed.

ArmMeasureValue (LEAST_SQUARES_MEAN)
Randomized Cohort-PlaceboChange From Day 1 in Cluster of Differentiation (CD) 4+ T-cell Count at Day 8-Randomized Cohort18.9 Cells per cubic millimeter
Randomized Cohort-fostemsavir 600 mg BIDChange From Day 1 in Cluster of Differentiation (CD) 4+ T-cell Count at Day 8-Randomized Cohort18.5 Cells per cubic millimeter
95% CI: [-16.8, 16]
Secondary

Change in CD4+ T- Cell Count Percentage From Day 1 at Day 8-Randomized Cohort

CD4+ T- cell counts were assessed by flow cytometry. Mean change in CD4+ T- cell count percentage from Day 1 at Day 8 was analyzed using one-way ANCOVA with change of CD4+ cell count percentage from Day 1 at Day 8 as the dependent variable, treatment (fostemsavir or placebo) as an independent variable, and Day 1 CD4+ cell count percentage as a continuous covariate. Change from Day 1 was calculated as value at Day 8 minus value at Day 1. Missing CD4+ cell count values at Day 8 were imputed using (a) D1OCF for participants without a value during blinded treatment (ie, imputing a zero change from Day 1), or (b) LOCF for participants with an early value during blinded treatment before the Day 8 analysis visit window.

Time frame: Day 1 and Day 8

Population: ITT-E Population. Only those participants with data available at the specified time points were analyzed.

ArmMeasureValue (LEAST_SQUARES_MEAN)
Randomized Cohort-PlaceboChange in CD4+ T- Cell Count Percentage From Day 1 at Day 8-Randomized Cohort0.243 Percentage of CD4+T- cells
Randomized Cohort-fostemsavir 600 mg BIDChange in CD4+ T- Cell Count Percentage From Day 1 at Day 8-Randomized Cohort0.860 Percentage of CD4+T- cells
95% CI: [0.082, 1.151]
Secondary

Number of Participants With Centers for Disease Control (CDC) Class C Events-Randomized Cohort

Disease progression during open label fostemsavir plus OBT was assessed based on the occurrence of new AIDS defining events (CDC Class C events) or death. The number of participants with on-treatment CDC Class C AIDS events is presented. All the participants received fostemsavir during the open-label period irrespective of the original arms to which they were randomized; hence, the combined totals for Randomized Cohort is presented as pre-specified in protocol and reporting and analysis plan.

Time frame: Up to Week 96 analysis cut-off date

Population: Safety Population

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Randomized Cohort-PlaceboNumber of Participants With Centers for Disease Control (CDC) Class C Events-Randomized Cohort23 Participants
Secondary

Number of Participants With Indicated Fold Change Ratio (FCR) Using the Monogram PhenoSense Entry Assay-Randomized Cohort

The phenotypic resistance to a drug is defined in terms of a fold change (FC) in IC50s, i.e., the ratio of the 50% inhibitory concentration (IC50) of the clinical isolate to the IC50 of a reference strain (wild type control). FCR was calculated as FC at PDVF divided by Baseline FC. The number of participants with the indicated change (ratio) in the two values at the time of PDVF is presented. FCR\<1 indicates that FC is smaller on-treatment than at Baseline. FCR \>3 indicates that on-treatment FC is 3 times greater than it was at Baseline.

Time frame: Week 96

Population: PDVF through Week 96 Population. Only participants available at the specified time point were analyzed.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
Randomized Cohort-PlaceboNumber of Participants With Indicated Fold Change Ratio (FCR) Using the Monogram PhenoSense Entry Assay-Randomized Cohort<=119 Participants
Randomized Cohort-PlaceboNumber of Participants With Indicated Fold Change Ratio (FCR) Using the Monogram PhenoSense Entry Assay-Randomized Cohort>1 to 310 Participants
Randomized Cohort-PlaceboNumber of Participants With Indicated Fold Change Ratio (FCR) Using the Monogram PhenoSense Entry Assay-Randomized Cohort>3 to 105 Participants
Randomized Cohort-PlaceboNumber of Participants With Indicated Fold Change Ratio (FCR) Using the Monogram PhenoSense Entry Assay-Randomized Cohort>10 to 1001 Participants
Randomized Cohort-PlaceboNumber of Participants With Indicated Fold Change Ratio (FCR) Using the Monogram PhenoSense Entry Assay-Randomized Cohort>100 to 300010 Participants
Randomized Cohort-PlaceboNumber of Participants With Indicated Fold Change Ratio (FCR) Using the Monogram PhenoSense Entry Assay-Randomized Cohort>30008 Participants
Secondary

Number of Participants With On-treatment Serious Adverse Events (SAEs) and Adverse Events (AEs) Leading to Discontinuation (AELD)-Randomized Cohort

An SAE is any untoward medical occurrence that at any dose: results in death; is life-threatening; requires inpatient hospitalization or causes prolongation of existing hospitalization; results in persistent or significant disability/incapacity; is a congenital anomaly/birth defect; an important medical event that may jeopardize the participant or require intervention. Number of participants with on-treatment SAEs and AEs leading to withdrawal of study treatment is presented. SAEs and AELDs were collected in Safety Population which comprised of all participants who received at least one dose of study treatment. All the participants received fostemsavir during the open-label period irrespective of the original arms to which they were randomized; hence, the combined totals for Randomized Cohort is presented as pre-specified in protocol and reporting and analysis plan.

Time frame: Up to Week 96 analysis cut-off date

Population: Safety Population.

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
Randomized Cohort-PlaceboNumber of Participants With On-treatment Serious Adverse Events (SAEs) and Adverse Events (AEs) Leading to Discontinuation (AELD)-Randomized CohortSAE92 Participants
Randomized Cohort-PlaceboNumber of Participants With On-treatment Serious Adverse Events (SAEs) and Adverse Events (AEs) Leading to Discontinuation (AELD)-Randomized CohortAELD14 Participants
Secondary

Number of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized Cohort

Laboratory toxicities were graded for severity according to the Division of Acquired Immunodeficiency Syndrome (DAIDS) grading system: Grade 1 (mild); Grade 2 (moderate); Grade 3 (severe); Grade 4 (potentially life-threatening). Baseline is defined as the latest pre-dose assessment. The number of participants with clinical chemistry toxicity grade increase to Grade 3-4 at anytime post-Baseline relative to Baseline is presented. All the participants received fostemsavir during the open-label period irrespective of the original arms to which they were randomized; hence, the combined totals for Randomized Cohort is presented as pre-specified in protocol and reporting and analysis plan.

Time frame: Baseline and up to Week 96 analysis cut-off date

Population: Safety Population. Only participants with data available at the specified time points were analyzed (represented by n=X in category titles).

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortCreatinine; n=26852 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortAlbumin; n=2681 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortAlkaline phosphatase; n=2683 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortAlanine aminotransferase; n=26814 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortAmylase; n=2682 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortAspartate aminotransferase; n=26810 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortBicarbonate; n=2681 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortDirect bilirubin; n=26820 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortBilirubin; n=2687 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortCalcium; n=2689 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortCholesterol; n=22110 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortCreatine kinase; n=2686 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortEstimated creatinine clearance; n=26875 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortGlucose/hyperglycemia; n=2676 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortGlucose/hypoglycemia; n=2672 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortPotassium/hyperkalemia; n=2684 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortPotassium/hypokalemia; n=2680 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortLow density lipoprotein (LDL) cholesterol; n=2168 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortLipase; n=26813 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortSodium/hypernatremia; n=2680 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortSodium/hyponatremia; n=2680 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortTriglycerides; n=22111 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Clinical Chemistry Results to Grade 3-4 Relative to Baseline-Randomized CohortUrate; n=2689 Participants
Secondary

Number of Participants With Toxicity Grade Increase in Hematology Results to Grade 3-4 Relative to Baseline-Randomized Cohort

Laboratory toxicities were graded for severity according to the DAIDS grading system: Grade 1 (mild); Grade 2 (moderate); Grade 3 (severe); Grade 4 (potentially life-threatening). Baseline is defined as the latest pre-dose assessment. The number of participants with hematology toxicity grade increase to Grade 3-4 at anytime post-Baseline relative to Baseline is presented. All the participants received fostemsavir during the open-label period irrespective of the original arms to which they were randomized; hence, the combined totals for Randomized Cohort is presented as pre-specified in protocol and reporting and analysis plan.

Time frame: Baseline and up to Week 96 analysis cut-off date

Population: Safety Population. Only participants with data available at the specified time points were analyzed (represented by n=X in category titles).

ArmMeasureGroupValue (COUNT_OF_PARTICIPANTS)
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Hematology Results to Grade 3-4 Relative to Baseline-Randomized CohortHemoglobin; n=26816 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Hematology Results to Grade 3-4 Relative to Baseline-Randomized CohortNeutrophils; n=26810 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Hematology Results to Grade 3-4 Relative to Baseline-Randomized CohortPlatelets; n=2672 Participants
Randomized Cohort-PlaceboNumber of Participants With Toxicity Grade Increase in Hematology Results to Grade 3-4 Relative to Baseline-Randomized CohortLeukocytes; n=2684 Participants
Secondary

Number of Participants With Treatment-emergent Viral Genotypic Substitution of Interest in the GP160 Domain as a Measure of Genotypic Resistance-Randomized Cohort

Plasma samples were collected for emergent drug resistance testing. The number of participants with emergent viral genotypic substitutions of interest in the GP160 domain was identified by the next-generation sequencing (NGS) assay. Protocol defined virologic failure (PDVF) through Week 96 Population comprised of all participants with available phenotypic and genotypic resistance data meeting at the time protocol defined virologic failure (PDVF) was met. The criteria for PDVF was a) Confirmed, or last available prior to discontinuation, HIV-1 RNA \>=400 c/mL at any time after prior confirmed suppression to \<400 c/mL prior to Week 24 or Confirmed, or last available prior to discontinuation, \> 1 log10 c/mL increase in HIV-1 RNA at any time above nadir level where nadir is \>=40 c/mL prior to Week 24. b) Confirmed, or last available prior to discontinuation, HIV-1 RNA \>=400 c/mL at or after Week 24.

Time frame: Week 96

Population: PDVF through Week 96 Population. Only participants available at the specified time point were analyzed.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Randomized Cohort-PlaceboNumber of Participants With Treatment-emergent Viral Genotypic Substitution of Interest in the GP160 Domain as a Measure of Genotypic Resistance-Randomized Cohort24 Participants
Secondary

Percentage of Participants With HIV-1 RNA <40 c/mL at Weeks 24, 48 and 96-Randomized Cohort

The durability of response (that is, the number of participants achieving HIV-1 RNA \<40 c/mL) at Weeks 24, 48 and 96 of open-label fostemsavir plus OBT in the Randomized Cohort was assessed using the Food and Drug Administration (FDA) snapshot algorithm in which participants without HIV-1 RNA at Weeks 24, 48 and 96 or those who changed OBT due to lack of efficacy through Weeks 24, 48 and 96 were counted as failures. The percentage of participants in the Randomized Cohort who achieved virologic success (HIV-1 RNA \<40 c/mL) at Weeks 24, 48 and 96 is presented along with 95% Wilson confidence interval. All the participants received fostemsavir during the open-label period irrespective of the original arms to which they were randomized; hence, the combined totals for Randomized Cohort is presented as pre-specified in protocol and reporting and analysis plan.

Time frame: At Weeks 24, 48 and 96

Population: ITT-E Population

ArmMeasureGroupValue (NUMBER)
Randomized Cohort-PlaceboPercentage of Participants With HIV-1 RNA <40 c/mL at Weeks 24, 48 and 96-Randomized CohortWeek 2453 Percentage of participants
Randomized Cohort-PlaceboPercentage of Participants With HIV-1 RNA <40 c/mL at Weeks 24, 48 and 96-Randomized CohortWeek 4854 Percentage of participants
Randomized Cohort-PlaceboPercentage of Participants With HIV-1 RNA <40 c/mL at Weeks 24, 48 and 96-Randomized CohortWeek 9660 Percentage of participants
Secondary

Percentage of Participants With HIV-1 RNA Decreases From Day 1 That Exceed 0.5 log10 c/mL and 1.0 log10 c/mL at Day 8-Randomized Cohort

The percentage of participants in the Randomized Cohort with HIV-1 RNA decreases from Day 1 that exceed 0.5 log10 c/mL and 1.0 log10 c/mL at Day 8 was determined by comparing HIV-1 RNA Day 1 measurement of each participant to their Day 8 measurement. This was an ITT analysis that classified participants without HIV-1 RNA at Day 1 or Day 8 as failures. The percentage of responders along with 95% confidence interval based on Wilson score is presented.

Time frame: Day 1 and Day 8

Population: ITT-E Population

ArmMeasureGroupValue (NUMBER)
Randomized Cohort-PlaceboPercentage of Participants With HIV-1 RNA Decreases From Day 1 That Exceed 0.5 log10 c/mL and 1.0 log10 c/mL at Day 8-Randomized Cohort>0.5 log10 c/mL18.84 Percentage of participants
Randomized Cohort-PlaceboPercentage of Participants With HIV-1 RNA Decreases From Day 1 That Exceed 0.5 log10 c/mL and 1.0 log10 c/mL at Day 8-Randomized Cohort>1.0 log10 c/mL10.14 Percentage of participants
Randomized Cohort-fostemsavir 600 mg BIDPercentage of Participants With HIV-1 RNA Decreases From Day 1 That Exceed 0.5 log10 c/mL and 1.0 log10 c/mL at Day 8-Randomized Cohort>0.5 log10 c/mL64.53 Percentage of participants
Randomized Cohort-fostemsavir 600 mg BIDPercentage of Participants With HIV-1 RNA Decreases From Day 1 That Exceed 0.5 log10 c/mL and 1.0 log10 c/mL at Day 8-Randomized Cohort>1.0 log10 c/mL45.81 Percentage of participants
95% CI: [32.95, 55.45]
95% CI: [24.16, 44.25]

Source: ClinicalTrials.gov · Data processed: Mar 2, 2026