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V350A

Phase 1

Healthy | Monoclonal antibody | Other |Merck & Company, Inc.|Last Updated: Aug 25, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment250

FDA Designations

No designations recorded

Clinical trial landscape

V350A · 1 trial · 1 indication

Phase 1 1
NCT06655324A Study to Evaluate Safety, Tolerability, and Immunogenicity of V350A and V350B in Healthy Participants (V350-001).Healthy
RECRUITING250 Analytics
PHASE1RECRUITING
A Study to Evaluate Safety, Tolerability, and Immunogenicity of V350A and V350B in Healthy Participants (V350-001).
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Study Endpoints

Primary Endpoints

Number of Participants with Solicited Injection Site Adverse Events (AEs)
Up to approximately 6 months

An adverse event (AE) is any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. Solicited injection site AEs will be recorded on a vaccination report card (VRC).

Number of Participants with Solicited Systemic AEs
Up to approximately 6 months

An AE is any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. Solicited systemic AEs will be recorded on a VRC.

Number of Participants with Immediate AEs Following Vaccinations
Up to approximately 6 months

An AE is any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. Participants will be observed following vaccination for immediate AEs.

Number of Participants with Unsolicited AEs
Up to approximately 7 months

An AE is any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. Unsolicited AEs will be recorded on a VRC.

Number of Participants with Serious AEs
Up to approximately 18 months

A serious adverse event (SAE) is an AE that results in death, is life threatening, results in a persistent or significant disability or incapacity, results in or prolongs an existing hospitalization, is a congenital anomaly or birth defect, is a cancer, is an overdose, or is another important medical event.

Number of Participants with Medically Attended Adverse Events (MAAEs)
Up to approximately 18 months

A MAAE is an AE in which medical attention is received during an unscheduled, non-routine outpatient visit, such as an emergency department visit, office visit, or an urgent care visit with any medical personnel for any reason. Routine visits are not considered MAAEs.

Number of Participants with Events of Clinical Interest (ECIs)
Up to approximately 18 months

ECIs are selected serious and nonserious AEs are defined as an overdose of Sponsor's product, drug-induced liver injury events, or potential immune-mediated diseases (pIMDs).

Secondary Endpoints

Geometric Mean Titers (GMT) of Immunoglobulin G (IgG) Antibodies Response Against Vaccine-matched Epstein Barr Virus (EBV) Antigens
Up to approximately 18 months
Geometric Mean Fold Rise (GMFR) of IgG Antibody Response against Vaccine-matched EBV Antigens
Baseline and up to approximately 18 months
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelSEQUENTIAL
PurposeBASIC_SCIENCE

Treatment Arms

ArmTypeDescription
V350AEXPERIMENTALParticipants will receive V350A vaccinations on Day 1, Month 2, and Month 6.
V350BEXPERIMENTALParticipants will receive V350B vaccinations on Day 1, Month 2, and Month 6.
PlaceboPLACEBO_COMPARATORParticipants will receive placebo vaccinations on Day 1, Month 2, and Month 6.

Interventions

NameTypeDescription
V350ABIOLOGICALVaccination administered via intramuscular injection
V350BBIOLOGICALVaccination administered via intramuscular injection
PlaceboBIOLOGICALVaccination administered via intramuscular injection
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Eligibility Criteria

Age Range12 Years to 30 Years
SexALL
Healthy VolunteersYes
Study Sites9

Inclusion Criteria: The key inclusion criteria include but are not limited to the following: * Is in good health before randomization. * Has a body mass index between 18 and 38 kg/m\^2, inclusive, for adults 18-30; has a body mass index between 15 and 38 kg/m\^2, inclusive, for adolescents 12-17. ...

Countries:United States
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Recent Changes (Last 90 Days)

LOWAug 25, 2026NCT06655324lastUpdatePostDate: changed
LOWAug 25, 2026NCT06655324lastUpdatePostDate: changed
LOWJul 24, 2026NCT06655324lastUpdatePostDate: changed
LOWJul 24, 2026NCT06655324lastUpdatePostDate: changed

Frequently asked questions about V350A

What is V350A?

V350A is an investigational monoclonal antibody being developed by Merck & Company, Inc. (MRK). It is currently in Phase 1 clinical development for use in healthy participants. The drug is being studied to evaluate its safety, tolerability, and immunogenicity.

What does V350A target?

V350A is a monoclonal antibody, but its specific molecular target has not been disclosed. The drug is being studied in healthy participants to assess its safety, tolerability, and immunogenicity, as part of early-stage clinical development.

Who makes V350A?

V350A is being developed by Merck & Company, Inc., which trades under the ticker symbol MRK. The company is conducting a Phase 1 clinical trial to evaluate the drug's safety, tolerability, and immunogenicity in healthy participants.

What phase is V350A in?

V350A is in Phase 1 clinical development. It is an investigational drug and has not been approved by regulatory authorities. A Phase 1 trial is currently recruiting participants to evaluate the drug's safety, tolerability, and immunogenicity.

What clinical trials is V350A in?

V350A is being studied in a Phase 1 clinical trial with the identifier NCT06655324. The trial, titled 'A Study to Evaluate Safety, Tolerability, and Immunogenicity of V350A and V350B in Healthy Participants (V350-001),' is recruiting 250 participants in the United States. The study is randomized, double-blind, and placebo-controlled.

Is V350A the same as V350B?

V350A and V350B are being studied together in the same clinical trial, NCT06655324, which evaluates the safety, tolerability, and immunogenicity of both drugs in healthy participants. However, they are distinct investigational agents being developed by Merck & Company, Inc.