A Study of Teropavimab and Zinlirvimab in Combination With Capsid Inhibitor Lenacapavir in Virologically Suppressed Adults With HIV-1 Infection

The goal of this study is to test the effectiveness, safety, and tolerability of the combination of broadly neutralizing antibodies (bNAbs) (teropavimab (TAB; GS-5423) and zinlirvimab (ZAB; GS-2872)) with lenacapavir (LEN) in virologically suppressed adults with HIV-1 infection. The purpose of this study is to evaluate the efficacy of switching to a regimen of LEN, TAB and ZAB, versus continuing on baseline oral antiretroviral therapy (ART) as determined by the proportion of participants with human immunodeficiency virus-1 (HIV-1) ribonucleic acid (RNA) ≥ 50 copies/mL at Week 26.

Participants will be randomized in Treatment Groups 1 and 2 to receive LEN, TAB, and ZAB, with differing doses of TAB and ZAB between the 2 groups and in Treatment Group 3 to continue their baseline oral ART for 52 weeks. Eligible participants in Treatment Groups 1 through 3 will have the option of participating in the study extension phase to receive LEN, TAB and ZAB after completing study follow-up through Week 52. Treatment Group 2 was removed prior to dosing of all groups during Protocol Amendment 2.

Key Inclusion Criteria: * On stable oral antiretroviral therapy (ART) consisting of no more than 2 drug classes (with the exception of pharmacologic boosters cobicistat or ritonavir) for ≥ 1 year prior to screening visit 2. A change in ART regimen ≥ 28 days prior to screening visit 2 for reasons other than virologic failure (VF) (eg, tolerability, simplification, drug-drug interaction profile) is allowed. * No clinically significant documented historical resistance to the current ART regimen with the exception of isolated nucleoside reverse transcriptase inhibitor mutations including M184V or ≤ 2 thymidine analog mutations (TAMs: M41L, D67N, K70R, L210W, T215Y, and/or K219Q). * Plasma human immunodeficiency virus-1 (HIV-1) ribonucleic acid (RNA) \< 50 copies/mL at screening visit 2. * Documented plasma HIV-1 RNA \< 50 copies/mL for ≥ 12 months preceding screening visit 2 (or undetectable HIV-1 RNA level according to the local assay being used if the limit of detection is ≥ 50 copies/mL). Virologic elevations of ≥ 50 copies/mL (transient detectable viremia or "blips") prior to screening are acceptable. * Proviral phenotypic sensitivity to both teropavimab and zinlirvimab at screening or from protocol GS-US-536-5816 within 24 months prior to screening. * Screening clusters of differentiation 4 (CD4)+ T-cell count ≥ 200 cells/μL at screening visit 2. Key Exclusion Criteria: * Comorbid condition requiring ongoing immunosuppression. * Evidence of hepatitis C virus (HCV) infection (prior infection cleared spontaneously or with treatment is acceptable) * Evidence of current hepatitis B virus (HBV) infection regardless of HBV surface antigen status, at the screening visit 2. * History of opportunistic infection or illness indicative of Stage 3 HIV disease. Note: Other protocol defined Inclusion/Exclusion criteria may apply.