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Pentamer /gB/Adjuvant vaccine

Phase 1

Cytomegalovirus Infections | Monoclonal antibody | Other |GSK plc|Last Updated: Mar 2, 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 Enrollment339
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05089630A Study of Safety and Immune Response to Different Doses of a Cytomegalovirus Vaccine in Healthy AdultsPHASE1 COMPLETED 339Oct 14, 2021Apr 2, 2025Mar 2, 202618 United States
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Study Endpoints
Primary Endpoints
Number of participants reporting solicited administration site events
Within 7 days (the day of dose and 6 subsequent days) after each dose (vaccines administered on Day 1, Day 61 and Day 181)

The solicited administration site events include pain, redness and swelling.

Number of participants reporting solicited systemic events
Within 7 days (the day of dose and 6 subsequent days) after each dose (vaccines administered on Day 1, Day 61 and Day 181)

The solicited systemic events include fever, myalgia, fatigue, arthralgia and headache. The preferred location for measuring temperature is the oral cavity. Fever is defined as body temperature ≥38.0°C/100.4°F by any route.

Number of participants reporting unsolicited adverse events (AEs) within 7 days after each dose
Within 7 days (the day of dose and 6 subsequent days) after each dose (vaccines administered on Day 1, Day 61 and Day 181)

An unsolicited AE is an AE that was not included in a list of solicited events using a Participant Diary. Also, any 'solicited' symptom with onset outside the specified period of follow-up for solicited symptoms is reported as an unsolicited adverse event.

Number of participants reporting serious adverse events (SAEs) within 7 days after each dose
Within 7 days (the day of dose and 6 subsequent days) after each dose (vaccines administered on Day 1, Day 61 and Day 181)

A SAE is any untoward medical occurrence that results in death, is life-threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity, is a congenital anomaly/birth defect in the offspring of a study participant or is an abnormal pregnancy outcome.

Number of participants reporting unsolicited AEs up to 30 days after each dose
Up to 30 days after each dose (vaccines administered on Day 1, Day 61 and Day 181)

An unsolicited AE is an AE that was not included in a list of solicited events using a Participant Diary. Unsolicited events must have been spontaneously communicated by a participant who has signed the informed consent. Also, any 'solicited' symptom with onset outside the specified period of follow-up for solicited symptoms is reported as an unsolicited adverse event.

Number of participants reporting SAEs up to 30 days after each dose
Up to 30 days after each dose (vaccines administered on Day 1, Day 61 and Day 181)

A SAE is any untoward medical occurrence that results in death, is life-threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity, is a congenital anomaly/birth defect in the offspring of a study participant or is an abnormal pregnancy outcome.

Number of participants reporting medically attended AEs (MAEs) up to 30 days after each dose
Up to 30 days after each dose (vaccines administered on Day 1, Day 61 and Day 181)

A MAE is an AE for which the participants received medical attention defined as hospitalization, an emergency room visit or a visit to or from medical personnel for any reason.

Number of participants reporting hematological and biochemical laboratory abnormalities on Day 1
At Day 1

The percentage of participants having hematology and biochemistry results below or above the laboratory normal ranges are tabulated by time point.

Number of participants reporting hematological and biochemical laboratory abnormalities on Day 8
At Day 8

The percentage of participants having hematology and biochemistry results below or above the laboratory normal ranges are tabulated by time point.

Number of participants reporting hematological and biochemical laboratory abnormalities on Day 61
At Day 61

The percentage of participants having hematology and biochemistry results below or above the laboratory normal ranges are tabulated by time point.

Number of participants reporting hematological and biochemical laboratory abnormalities on Day 68
At Day 68

The percentage of participants having hematology and biochemistry results below or above the laboratory normal ranges are tabulated by time point.

Number of participants reporting hematological and biochemical laboratory abnormalities on Day 181
At Day 181

The percentage of participants having hematology and biochemistry results below or above the laboratory normal ranges are tabulated by time point.

Number of participants reporting hematological and biochemical laboratory abnormalities on Day 188
Day 188

The percentage of participants having hematology and biochemistry results below or above the laboratory normal ranges are tabulated by time point.

Secondary Endpoints
Number of participants reporting unsolicited AEs from Dose 1 to end of study (Month 18)
From Dose 1 (Day 1) to end of study (Month 18)
Number of participants reporting MAEs from Dose 1 to end of study (Month 18)
From Dose 1 (Day 1) to end of study (Month 18)
Number of participants reporting SAEs from Dose 1 to end of study (Month 18)
From Dose 1 (Day 1) to end of study (Month 18)
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposePREVENTION
Treatment Arms
ArmTypeDescription
Pentamer(low)/gB(low)/Adjuvant GroupEXPERIMENTALParticipants receive the candidate CMVsu vaccine consisting of a combination of low dose pentamer and low dose gB antigens, adjuvanted at 0, 2 and 6 months and are followed up until end of study (Day 546).
Pentamer (med)/gB(low)/Adjuvant GroupEXPERIMENTALParticipants receive the candidate CMVsu vaccine consisting of a combination of medium dose pentamer and low dose gB antigens, adjuvanted at 0, 2 and 6 months and are followed up until end of study (Day 546).
Pentamer (med)/gB(med)/Adjuvant GroupEXPERIMENTALParticipants receive the candidate CMVsu vaccine consisting of a combination of medium dose pentamer and medium dose gB antigens, adjuvanted at 0, 2 and 6 months and are followed up until end of study (Day 546).
Pentamer (high)/gB(med)/Adjuvant GroupEXPERIMENTALParticipants receive the candidate CMVsu vaccine consisting of a combination of high dose pentamer and medium dose gB antigens, adjuvanted at 0, 2 and 6 months and are followed up until end of study (Day 546).
Placebo GroupPLACEBO_COMPARATORParticipants receive placebo (saline) at 0,2 and 6 months and are followed up until end of study (Day 546).
Interventions
NameTypeDescription
Pentamer (low)/gB(low)/Adjuvant vaccineBIOLOGICALThree doses of the candidate CMVsu vaccine consisting of a combination of low dose pentamer and low dose gB antigens, adjuvanted are administered intramuscularly in the deltoid region of the non-dominant arm in a 0, 2, 6-month schedule.
Pentamer (med)/gB(low)/Adjuvant vaccineBIOLOGICALThree doses of the candidate CMVsu vaccine consisting of a combination of medium dose pentamer and low dose gB antigens, adjuvanted are administered intramuscularly in the deltoid region of the non-dominant arm in a 0, 2, 6-month schedule.
Pentamer (med)/gB(med)/Adjuvant vaccineBIOLOGICALThree doses of the candidate CMVsu vaccine consisting of a combination of medium dose pentamer and medium dose gB antigens, adjuvanted are administered intramuscularly in the deltoid region of the non-dominant arm in a 0, 2, 6-month schedule.
Pentamer (high)/gB(med)/Adjuvant vaccineBIOLOGICALThree doses of the candidate CMVsu vaccine consisting of a combination of high dose pentamer and medium dose gB antigens, adjuvanted are administered intramuscularly in the deltoid region of the non-dominant arm in a 0, 2, 6-month schedule.
Placebo (saline)COMBINATION_PRODUCTThree doses of placebo (saline) are administered intramuscularly in the deltoid region of the non-dominant arm in a 0, 2, 6-month schedule.
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Eligibility Criteria
Age Range18 Years — 50 Years
SexALL
Healthy VolunteersYes
Study Sites18

Inclusion Criteria: * Participants who, in the opinion of the investigator, can and will comply with the requirements of the protocol. * Written informed consent obtained from the participant prior to performance of any study specific procedure. * A healthy adult (woman or man), 18 to 50 years of a...

Countries:United States
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Recent Changes (Last 90 Days)
MEDIUMApr 8, 2026NCT05089630TRIAL_REMOVED: changed
MEDIUMApr 8, 2026NCT05089630TRIAL_REMOVED: changed