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V350A

Phase 1

Healthy | Monoclonal antibody | Other |Merck & Company, Inc.|Last Updated: Jun 1, 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
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Trial Design
RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment250
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06655324A Study to Evaluate Safety, Tolerability, and Immunogenicity of V350A and V350B in Healthy Participants (V350-001).PHASE1 RECRUITING 250Dec 5, 2024Jul 17, 2028Jun 1, 20269 United States
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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 — 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)
LOWJun 2, 2026NCT06655324lastUpdatePostDate: changed
LOWJun 2, 2026NCT06655324lastUpdatePostDate: changed
LOWJun 2, 2026NCT06655324lastUpdatePostDate: changed
LOWMay 26, 2026NCT06655324Enrollment: 200 → 250
LOWMay 24, 2026NCT06655324studyFirstPostDate: changed