Study to Compare an Oral Weekly Islatravir/Lenacapavir Regimen With Bictegravir/Emtricitabine/Tenofovir Alafenamide in Virologically Suppressed People With HIV-1 (ISLEND-1)

Prior treatment

• Participants who meet any of the following exclusion criteria are not eligible to be enrolled in this study: 1) Prior virologic failure. 2) Prior use of, or exposure to, ISL or LEN. 3) Active, serious infections requiring parenteral therapy within 30 days before randomization. 4) Active tuberculosis infection. 5) Acute hepatitis within 30 days before randomization. 6) HBV infection, as determined below at the screening visit: a) Positive HBV surface antigen. OR b) Positive HBV core antibody and negative HBV surface antibody. Note: participants found to be susceptible to HBV infection (eg, negative hepatitis B surface antibody at the screening visit, regardless of prior HBV vaccination history) should be recommended to receive HBV vaccination.
• Any other clinical condition or prior therapy that, in the opinion of the investigator, would make the participant unsuitable for the study or unable to comply with dosing requirements.
• Requirement for ongoing therapy or use of any prohibited medications listed in Section 5.3 within 30 days prior to screening through the last dose of study drug.
• Active hepatitis C virus (HCV) coinfection, defined as detectable HCV RNA. Note: participants with prior/inactive HCV infection (defined as undetectable HCV RNA) may be enrolled.
• Treatment < 3 months prior to screening or anticipated treatment during the study period with immunosuppressant therapies, hydroxyurea, foscarnet, radiation, or cytotoxic chemotherapeutic agents without approval from sponsor prior to randomization. Agents disallowed in Section 5.3 may not be considered for sponsor approval.
• Participation or planned participation in any other clinical study (including observational studies) without prior approval from the sponsor.

Other illness

• History of or current clinical decompensated liver cirrhosis (eg, ascites, encephalopathy, or variceal bleeding).
• Active malignancy requiring acute systemic therapy.
• Known hypersensitivity to any of the study drugs, their metabolites, or formulation excipients.

Lab values

• Participants of childbearing potential (as defined in Appendix 11.5) who have a positive serum pregnancy test at screening or positive urine and serum pregnancy tests at Day 1 prior to study drug administration.
• Any of the following laboratory values at screening: a) CLcr ≤ 30 mL/min according to the Cockcroft-Gault formula. {Cockcroft 1976} b) Alanine aminotransferase > 5  upper limit of normal (ULN). c) Direct bilirubin > 1.5  ULN. d) Platelets < 50,000/μL. e) Hemoglobin < 8.0 g/dL.

Other

• Participants who plan to continue breastfeeding during the study.
• Note: Other protocol defined Exclusion criteria may apply.
• Abnormal electrocardiogram (ECG) at the screening visit that is clinically significant as determined by the investigator.

• Participants 18 years of age or older at screening and able to understand and give written informed consent.
• HIV-1 RNA < 50 copies/mL for ≥ 6 months before screening, as documented by: • One HIV-1 RNA < 50 copies/mL immediately preceding the 24 week period prior to screening. • Within 24 weeks prior to screening, if HIV-1 RNA results are available, all levels must be < 50 copies/mL. • During the 6 to 12 months period prior to screening, transient detectable viremia ≥ 50 copies/mL is acceptable (“blip”), as long as it is not confirmed on 2 consecutive visits.
• Plasma HIV-1 RNA levels < 50 copies/mL at screening.
• Participants are receiving B/F/TAF for ≥ 6 months prior to screening and willing to continue until Day 1.
• Participants assigned female at birth and of childbearing potential who engage in heterosexual intercourse must agree to use protocol-specified methods of contraception as described in Appendix 11.5.
• Note: Other protocol defined Inclusion criteria may apply.