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ISL/LEN

Phase 3

HIV-1-infection | Small molecule | Infectious Disease |Gilead Sciences, Inc.|Last Updated: May 29, 2026

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
Premium
Trial Design
RandomizedDouble-BlindCONTROLLEDDMCBiomarker
Total Trials2
Total Enrollment1,209
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06630286Study to Compare an Oral Weekly Islatravir/Lenacapavir Regimen With Bictegravir/Emtricitabine/Tenofovir Alafenamide in Virologically Suppressed People With HIV-1PHASE3 ACTIVE NOT_RECRUITING 609Oct 9, 2024Aug 1, 2030Apr 30, 2026106 United States, Argentina +10
NCT06630299Study to Compare an Oral Weekly Islatravir/Lenacapavir Regimen With Standard of Care in Virologically Suppressed People With HIV-1PHASE3 ACTIVE NOT_RECRUITING 600Oct 8, 2024Aug 1, 2030May 29, 2026100 United States, Argentina +12
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Study Endpoints
Primary Endpoints
Proportion of Participants with HIV-1 RNA ≥ 50 Copies/mL at Week 48 as Determined by the United States (US) Food and Drug Administration (FDA)-Defined Snapshot Algorithm
Week 48
Secondary Endpoints
Proportion of Participants With HIV-1 RNA ≥ 50 Copies/mL at Week 96 as Determined by the US FDA-Defined Snapshot Algorithm
Week 96
Proportion of Participants with HIV-1 RNA < 50 Copies/mL at Weeks 48 as Determined by the US FDA-Defined Snapshot Algorithm
Week 48
Proportion of Participants with HIV-1 RNA < 50 Copies/mL at Weeks 96 as Determined by the US FDA-Defined Snapshot Algorithm
Week 96
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Study Design & Arms
AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Blinded Phase: ISL/LEN + Placebo-to-Match (PTM) B/F/TAFEXPERIMENTALParticipants will receive an initial dose of ISL/LEN (Dose A), followed by once weekly ISL/LEN (Dose B) from Day 8 onwards up to Week 96. Participants will also receive PTM B/F/TAF once daily from Day 1 up to Week 96.
Blinded Phase: PTM ISL/LEN + B/F/TAFEXPERIMENTALParticipants will receive an initial dose of PTM ISL/LEN (Dose A), followed by once weekly PTM ISL/LEN (Dose B) from Day 8 onwards up to Week 96. Participants will also receive B/F/TAF (50/200/25 mg) once daily up from Day 1 up to Week 96.
Open- Label Extension (OLE) PhaseEXPERIMENTALAfter the end of Blinded Phase at Week 96, if safety and efficacy of ISL/LEN are demonstrated following review of unblinded data, all participants will be given an option to enter the open-label extension phase to receive ISL/LEN in an extension phase until ISL/LEN becomes available or until the sponsor elects to discontinue the study, whichever occurs first. Participants receiving ISL/LEN and PTM B/F/TAF during the blinded phase will continue to take ISL/LEN weekly. Participants receiving B/F/TAF and PTM ISL/LEN during the blinded phase will take an initial dose of ISL/LEN (Dose A), followed by once weekly ISL/LEN (Dose B) from Day 8 onwards.
ISL/LENEXPERIMENTALParticipants will receive an initial dose of ISL/LEN (Dose A), followed by once weekly ISL/LEN (Dose B) from Day 8 onwards up to Week 96.
Standard of Care TreatmentACTIVE_COMPARATORParticipants will continue standard of care treatment with 2-3 ARVs up to Week 96: * Integrase Strand Transfer Inhibitor (INSTI) class: INSTI combined with 1 or 2 nucleoside reverse transcriptase inhibitors (NRTIs; bictegravir/emtricitabine/tenofovir alafenamide (B/F/TAF; coformulated; Biktarvy®), dolutegravir (DTG)/abacavir (ABC)/lamivudine (3TC), DTG+ TAF or TDF (TXF)/emtricitabine (FTC; Emtriva®), DTG/tenofovir disoproxil fumarate (TDF; Viread®)/3TC, DTG/3TC, raltegravir (RAL) + TXF/FTC, RAL+TDF/3TC, elvitegravir (EVG; Vitekta®)/cobicistat (c; Tybost®)/TXF/FTC), or * PI class: Boosted protease inhibitor (PI) combined with 2 NRTIs (darunavir/cobicistat/emtricitabine/tenofovir alafenamide (D/C/F/TAF; coformulated), boosted darunavir (DRV)+TXF/FTC, boosted DRV+TDF/3TC), or * NNRTI class: Nonnucleoside reverse transcriptase inhibitor (NNRTI) combined with 2 NRTIs (doravirine (DOR)/TDF/3TC, DOR+TXF/FTC, DOR+TDF/3TC, rilpivirine (RPV)/TXF/FTC, RPV+TXF/FTC, RPV+TDF/3TC)
Extension PhaseEXPERIMENTALAt the end of randomized treatment visit, if safety and efficacy of ISL/LEN are demonstrated following review of randomized data, participants will be given the option to receive ISL/LEN tablets in an extension phase until ISL/LEN becomes available or until the sponsor elects to discontinue the study, whichever occurs first. Participants receiving ISL/LEN during the randomized phase will continue to take ISL/LEN weekly. Participants receiving standard of care during the randomized phase will take an initial dose of ISL/LEN (Dose A), followed by once weekly ISL/LEN (Dose B) from Day 8 onwards.
Interventions
NameTypeDescription
ISL/LENDRUGTablet administered orally
B/F/TAFDRUGTablet administered orally
PTM B/F/TAFDRUGTablet administered orally
PTM ISL/LENDRUGTablet administered orally
Antiretroviral CombinationsDRUG2 or 3 antiretrovirals (ARVs) administered as defined by the investigator, according to the prescribing information.
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites106

Key Inclusion Criteria: * HIV-1 RNA \< 50 copies/mL for ≥ 6 months before screening, as documented by: 1. One HIV-1 RNA \< 50 copies/mL immediately preceding the 24 week period prior to screening. 2. Within 24 weeks prior to screening, if HIV-1 RNA results are available, all levels must be \< ...

Countries:United StatesArgentinaAustraliaCanadaFranceGermanyJapanPuerto RicoSpainSwitzerlandTaiwanUnited KingdomNetherlandsPolandSouth AfricaThailand
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Recent Changes (Last 90 Days)
LOWMay 29, 2026NCT06630299primaryCompletionDate: changed
LOWMay 29, 2026NCT06630299primaryCompletionDate: changed
LOWMay 29, 2026NCT06630299primaryCompletionDate: changed
LOWMay 26, 2026NCT06630299primaryCompletionDate: changed
LOWMay 26, 2026NCT06630286primaryCompletionDate: changed
LOWMay 24, 2026NCT06630299studyFirstPostDate: changed
LOWMay 24, 2026NCT06630286studyFirstPostDate: changed