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BNT351

Phase 1

HIV -1 Infection | Small molecule | Infectious Disease |BioNTech SE|Trials Updated: Sep 1, 2026

BNT351 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Feb 2026

BNT351 target and mechanism

Molecular target4-1BB
Target classProtein
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLED
Total Trials1
Total Enrollment67

FDA Designations

No designations recorded

BNT351 clinical trials

BNT351 · 1 trial · 1 indication

Phase 1 1
NCT07392372A Clinical Trial Investigating the Safety and Biological Activity of the Antibody BNT351 in Adults Living Without and With HIVHIV -1 Infection
RECRUITING67 Analytics
PHASE1RECRUITING
A Clinical Trial Investigating the Safety and Biological Activity of the Antibody BNT351 in Adults Living Without and With HIV
HIV -1 InfectionUnlock trial analytics

Study Endpoints

Primary Endpoints

Parts A and B - Occurrence of at least one adverse event (AE)
From dosing to 56 days post-dose

Per part, by cohort/dose

Parts A and B - Occurrence of at least one serious AE (SAE)
From dosing to 56 days post-dose

Per part, by cohort/dose

Parts A and B (except for Cohort A1) - Occurrence of infusion-related reactions (IRRs) Grade ≥2 (graded based on National Cancer Institute Common Terminology Criteria for AEs [NCI CTCAE] version 5.0 as specified in the protocol)
From the start of IV dosing through 72 hours after the start of IV dosing

Per part, by cohort/dose

Parts A and B - Occurrence of at least one solicited local reaction (pain/tenderness, erythema/redness, induration/swelling) at the investigational medicinal product administration site
From dosing through 7 days post-dose

Per part, by cohort/dose

Parts A and B- Occurrence of at least one solicited systemic event (vomiting, diarrhea, headache, fatigue/malaise, myalgia/arthralgia, fever)
From dosing through 7 days post-dose

Per part, by cohort/dose

Parts A and B - Assessment of maximum concentration of BNT351
From dosing through 7 days post-dose

Per part, by cohort/dose

Part B - Occurrence of any acquired immunodeficiency syndrome (AIDS)-defining illness or opportunistic infection as defined in the protocol
From dosing up to the time of cART initiation (up to a maximum of 56 days post-dose)
Part B - Occurrence of absolute CD4+ T cell count <350 cells/µL or CD4+ T cell count <15% of total lymphocyte count
From dosing up to the time of cART initiation (up to a maximum of 56 days post-dose)
Part B - Change from baseline in HIV log10 plasma viral load prior to cART initiation
At 7, 14, 21, 28, 35, 42, 49, and 56 days post-dose
Part B - Maximum decrease from baseline in HIV log10 plasma viral load prior to cART initiation
From baseline up to the time of cART initiation (up to a maximum of 56 days post-dose)
Part B - Time from dosing to lowest viral load prior to cART initiation
From dosing up to the time of cART initiation (up to a maximum of 56 days post-dose)
Part B - Time from dosing to viral rebound defined as HIV-1 RNA viral load increase >0.75 log10 copies/mL from nadir (i.e., lowest HIV-1 RNA viral load from 7 days post-dose (Visit 3) and through pre-cART initiation)
From dosing up to the time of cART initiation (up to a maximum of 56 days post-dose)

Secondary Endpoints

Parts A and B - Occurrence of at least one serious adverse event (SAE)
From dosing through end of study (up to a maximum of 279 days post-dose)
Parts A and B - Assessment of area under the concentration-time curve of BNT351, from pre-dose to last quantifiable timepoint (AUClast)
From pre-dose to last quantifiable timepoint (up to a maximum of 279 days post-dose)
Parts A and B - Incidence of detectable BNT351 anti-drug antibodies in serum
From baseline until the end of study (up to a maximum of 279 days post-dose)
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part A - Cohort A1EXPERIMENTALPLWOH will be randomized to BNT351 (at a protocol defined dose level) or placebo (2:1)
Part A - Cohort A2EXPERIMENTALPLWOH will be randomized to BNT351 (at a protocol defined dose level) or placebo (3:1)
Part A - Cohort A3EXPERIMENTALPLWOH will be randomized to BNT351 (at a protocol defined dose level) or placebo (3:1)
Part A - Cohort A4EXPERIMENTALPLWOH will be randomized to BNT351 (at a protocol defined dose level) or placebo (3:1)
Part B - Cohort B1EXPERIMENTALPLWH will receive BNT351 at a protocol-defined dose level. cART will start 56 days post-BNT351 dosing or earlier.
Part B - Cohort B2EXPERIMENTALPLWH will receive BNT351 at a protocol-defined dose level. cART will start 56 days post-BNT351 dosing or earlier.

Interventions

NameTypeDescription
BNT351DRUGIV infusion
PlaceboDRUGIV infusion
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Eligibility Criteria

Age Range18 Years to 65 Years
SexALL
Healthy VolunteersYes
Study Sites6

Key Inclusion Criteria Part A: * Are HIV-1 and HIV-2 negative at Visit 0. * Starting at Visit 0 and continuously until the last planned visit in this study are individuals who: 1. Are assessed by the investigator as having a low likelihood of acquiring HIV and are committed to avoiding behavior...

Countries:United StatesGermany
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Recent Changes (Last 90 Days)

LOWSep 1, 2026NCT07392372lastUpdatePostDate: changed
LOWSep 1, 2026NCT07392372lastUpdatePostDate: changed
LOWAug 12, 2026NCT07392372lastUpdatePostDate: changed
LOWAug 12, 2026NCT07392372lastUpdatePostDate: changed

Frequently asked questions about BNT351

What is BNT351?

BNT351 is an investigational small molecule being developed by BioNTech SE for HIV-1 infection. It is in Phase 1 clinical development and is designed to target the 4-1BB protein. The program is in early-stage testing, with one active trial currently recruiting participants.

What is BNT351 used for in HIV-1 infection?

BNT351 is being studied for use in HIV-1 infection. It is an investigational agent in Phase 1 development, and its safety and biological activity are being evaluated in adults living with and without HIV. It has not been approved for any indication.

What does BNT351 target?

BNT351 targets the 4-1BB protein, also known as CD137. 4-1BB is a costimulatory receptor, and BNT351 is a small molecule designed to engage this target. This mechanism is being explored in the context of HIV-1 infection.

Who is developing BNT351?

BNT351 is being developed by BioNTech SE, a biotechnology company whose shares trade under the ticker BNTX. BioNTech is the sponsor of the Phase 1 clinical trial evaluating BNT351 in adults with and without HIV.

What phase is BNT351 in?

BNT351 is in Phase 1 clinical development. It is investigational and has not been approved by the FDA or any regulatory authority. The ongoing Phase 1 trial is evaluating its safety and biological activity in adults living with and without HIV.

What clinical trials is BNT351 in?

BNT351 is being evaluated in a single Phase 1 trial, NCT07392372, titled "A Clinical Trial Investigating the Safety and Biological Activity of the Antibody BNT351 in Adults Living Without and With HIV." The trial is recruiting, has an estimated enrollment of 67 participants, and is conducted in the United States and Germany.