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Pentamer/gB/Adjuvant vaccine

Phase 1

Cytomegalovirus Infections | Monoclonal antibody | Infectious Disease |GSK plc|Last Updated: Jul 17, 2026

Success Probability

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment333

FDA Designations

No designations recorded

Clinical trial landscape

Pentamer/gB/Adjuvant vaccine · 1 trial · 1 indication

Phase 1 1
NCT05089630A Study of Safety and Immune Response to Different Doses of a Cytomegalovirus Vaccine in Healthy AdultsCytomegalovirus Infections
COMPLETED333 Analytics
PHASE1COMPLETED
A Study of Safety and Immune Response to Different Doses of a Cytomegalovirus Vaccine in Healthy Adults
Cytomegalovirus InfectionsUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants With Solicited Administration Site Adverse Events Post Each Dose Administration
Within 7 days post each dose (doses administered on Day 1, Day 61 and Day 181)

The assessed solicited administration site adverse events were erythema (injection site redness), pain and swelling.

Number of Participants With Solicited Systemic Adverse Events Post Each Dose Administration
Within 7 days post each dose (doses administered on Day 1, Day 61 and Day 181)

The assessed solicited administration site adverse events were arthralgia, fatigue, headache, fever and myalgia. Fever was defined as body temperature ≥38.0°Celsius/100.4°Fahrenheit.

Number of Participants With Unsolicited Adverse Events (AEs) Within 7 Days Post Each Dose Administration
Within 7 days post each dose (doses administered on Day 1, Day 61 and Day 181)

An unsolicited AE is defined as an AE that was not included in a list of solicited events using a Participant Diary. Unsolicited AEs include both serious and non-serious AEs.

Number of Participants With Unsolicited Serious Adverse Events (SAEs) Within 7 Days Post Each Dose Administration
Within 7 days post each dose (doses administered on Day 1, Day 61 and Day 181)

An SAE is defined as any untoward medical occurrence that, at any dose, resulted in death, was life-threatening, required hospitalization or prolongation of existing hospitalization, resulted in disability/incapacity, caused a congenital anomaly/birth defect, or was any other situation identified according to medical or scientific judgment. An unsolicited SAE is defined as an SAE that was not included in a list of solicited events using a Participant Diary.

Number of Participants With Unsolicited AEs up to 30 Days Post Each Dose Administration
Within 30 days post each dose (doses administered on Day 1, Day 61 and Day 181)

An unsolicited AE is defined as an AE that was not included in a list of solicited events using a Participant Diary. The solicited AEs that had an onset after 7 days post each dose administration are considered unsolicited AEs. Unsolicited AEs include both serious and non-serious AEs.

Number of Participants With Unsolicited SAEs up to 30 Days Post Each Dose Administration
Within 30 days post each dose (doses administered on Day 1, Day 61 and Day 181)
Number of Participants With Medically Attended Events (MAEs) up to 30 Days Post Each Dose Administration
Within 30 days post each dose (doses administered on Day 1, Day 61 and Day 181)

MAE is defined as an AE for which the participant received medical attention defined as hospitalization, an emergency room visit or a visit to or from medical personnel (i.e., nurse practitioner or physician assistant or medical doctor) for any reason.

Number of Participants With Hematological and Biochemical Laboratory Abnormalities on Day 1
On Day 1

The hematological and biochemical parameters included alanine aminotransferase (ALT), aspartate aminotransferase (AST), creatinine, eosinophils, hemoglobin, lymphocytes, neutrophils, platelets, white blood cells (WBC). Categories reported when comparing normal range and Day 1 hematological and biochemical laboratory results are defined as follows: \<parameter\>, \<range at timing\> (e.g. Hemoglobin, Below). Below = value below the laboratory reference range defined for the specified visit and laboratory parameter; Within = value within the laboratory reference range defined for the specified visit and laboratory parameter; Above = value above the laboratory reference range defined for the specified visit and laboratory parameter. Missing = No results are available for the corresponding laboratory parameter at the specific timepoint.

Number of Participants With Hematological and Biochemical Laboratory Abnormalities on Day 8
On Day 8

The hematological and biochemical parameters included ALT, AST, creatinine, eosinophils, hemoglobin, lymphocytes, neutrophils, platelets, WBC. Categories reported when comparing normal range and Day 8 hematological and biochemical laboratory results are defined as follows: \<parameter\>, \<range at timing\> (e.g. Hemoglobin, Below). Below = value below the laboratory reference range defined for the specified visit and laboratory parameter; Within = value within the laboratory reference range defined for the specified visit and laboratory parameter; Above = value above the laboratory reference range defined for the specified visit and laboratory parameter. Missing = No results are available for the corresponding laboratory parameter at the specific timepoint.

Number of Participants With Hematological and Biochemical Laboratory Abnormalities on Day 61
On Day 61

The hematological and biochemical parameters included ALT, AST, creatinine, eosinophils, hemoglobin, lymphocytes, neutrophils, platelets, WBC. Categories reported when comparing normal range and Day 61 hematological and biochemical laboratory results are defined as follows: \<parameter\>, \<range at timing\> (e.g. Hemoglobin, Below). Below = value below the laboratory reference range defined for the specified visit and laboratory parameter; Within = value within the laboratory reference range defined for the specified visit and laboratory parameter; Above = value above the laboratory reference range defined for the specified visit and laboratory parameter. Missing = No results are available for the corresponding laboratory parameter at the specific timepoint.

Number of Participants With Hematological and Biochemical Laboratory Abnormalities on Day 68
On Day 68

The hematological and biochemical parameters included ALT, AST, creatinine, eosinophils, hemoglobin, lymphocytes, neutrophils, platelets, WBC. Categories reported when comparing normal range and Day 68 hematological and biochemical laboratory results are defined as follows: \<parameter\>, \<range at timing\> (e.g. Hemoglobin, Below). Below = value below the laboratory reference range defined for the specified visit and laboratory parameter; Within = value within the laboratory reference range defined for the specified visit and laboratory parameter; Above = value above the laboratory reference range defined for the specified visit and laboratory parameter. Missing = No results are available for the corresponding laboratory parameter at the specific timepoint.

Number of Participants With Hematological and Biochemical Laboratory Abnormalities on Day 181
On Day 181

The hematological and biochemical parameters included ALT, AST, creatinine, eosinophils, hemoglobin, lymphocytes, neutrophils, platelets, WBC. Categories reported when comparing normal range and Day 181 hematological and biochemical laboratory results are defined as follows: \<parameter\>, \<range at timing\> (e.g. Hemoglobin, Below). Below = value below the laboratory reference range defined for the specified visit and laboratory parameter; Within = value within the laboratory reference range defined for the specified visit and laboratory parameter; Above = value above the laboratory reference range defined for the specified visit and laboratory parameter. Missing = No results are available for the corresponding laboratory parameter at the specific timepoint.

Number of Participants With Hematological and Biochemical Laboratory Abnormalities on Day 188
On Day 188

The hematological and biochemical parameters included ALT, AST, creatinine, eosinophils, hemoglobin, lymphocytes, neutrophils, platelets, WBC. Categories reported when comparing normal range and Day 188 hematological and biochemical laboratory results are defined as follows: \<parameter\>, \<range at timing\> (e.g. Hemoglobin, Below). Below = value below the laboratory reference range defined for the specified visit and laboratory parameter; Within = value within the laboratory reference range defined for the specified visit and laboratory parameter; Above = value above the laboratory reference range defined for the specified visit and laboratory parameter. Missing = No results are available for the corresponding laboratory parameter at the specific timepoint.

Secondary Endpoints

Number of Participants With Unsolicited Events, SAEs, MAEs and Potential Immune Mediated Diseases (pIMDs) From Day 1 to Day 546 (End of Study)
Day 1 to Day 546
Geometric Mean Titers (GMT) of Neutralizing Antibodies (nAbs) Against Epithelial Cell Infection (CMV Status: Sero-positive)
On Day 1, Day 31, Day 61, Day 91, Day 181, Day 211, Day 361 and Day 546
GMT of nAbs Against Epithelial Cell Infection (CMV Status: Sero-negative)
On Day 1, Day 31, Day 61, Day 91, Day 181, Day 211, Day 361 and Day 546
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
Pentamer (low dose)/glycoprotein B (gB) (low dose)/Adjuvant groupEXPERIMENTALParticipants received a dose of the candidate cytomegalovirus (CMV) vaccine consisting of a combination of low dose of pentamer and low dose of gB antigens, adjuvanted, at Day 1, Day 61 and Day 181 intramuscularly.
Pentamer (medium dose)/gB (low dose)/Adjuvant groupEXPERIMENTALParticipants received a dose of the candidate CMV vaccine consisting of a combination of medium dose of pentamer and low dose of gB antigens, adjuvanted, at Day 1, Day 61 and Day 181 intramuscularly.
Pentamer (medium dose)/gB (medium dose)/Adjuvant groupEXPERIMENTALParticipants received a dose of the candidate CMV vaccine consisting of a combination of medium dose of pentamer and medium dose of gB antigens, adjuvanted, at Day 1, Day 61 and Day 181 intramuscularly.
Pentamer (high dose)/gB (medium dose)/Adjuvant groupEXPERIMENTALParticipants received a dose of the candidate CMV vaccine consisting of a combination of high dose of pentamer and medium dose of gB antigens, adjuvanted, at Day 1, Day 61 and Day 181 intramuscularly.
Placebo GroupPLACEBO_COMPARATORParticipants received a dose of placebo at Day 1, Day 61 and Day 181 intramuscularly.

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 solution)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 to 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)

MEDIUMAug 17, 2026NCT05089630TRIAL_REMOVED: changed
MEDIUMAug 17, 2026NCT05089630TRIAL_REMOVED: changed
MEDIUMAug 17, 2026NCT05089630TRIAL_REMOVED: changed

Frequently asked questions about Pentamer/gB/Adjuvant vaccine

What is Pentamer/gB/Adjuvant vaccine used for?

Pentamer/gB/Adjuvant vaccine is an investigational vaccine being studied for the prevention of Cytomegalovirus (CMV) infections. It is designed to elicit an immune response against the virus in healthy adults. The vaccine is currently in Phase 1 clinical development and has not been approved by regulatory authorities.

Who makes Pentamer/gB/Adjuvant vaccine?

Pentamer/gB/Adjuvant vaccine is being developed by GSK plc, a global biopharma company listed on the London Stock Exchange under the ticker GSK. GSK is conducting clinical trials to evaluate the safety and immunogenicity of this investigational CMV vaccine candidate.

What phase is Pentamer/gB/Adjuvant vaccine in?

Pentamer/gB/Adjuvant vaccine is in Phase 1 clinical development. A Phase 1 trial has been completed, evaluating the safety and immune response to different doses of the vaccine in healthy adults. The vaccine remains investigational and is not yet approved for commercial use.

What clinical trials is Pentamer/gB/Adjuvant vaccine in?

Pentamer/gB/Adjuvant vaccine has been studied in one completed Phase 1 clinical trial with the identifier NCT05089630. The trial, titled 'A Study of Safety and Immune Response to Different Doses of a Cytomegalovirus Vaccine in Healthy Adults,' enrolled 333 participants in the United States and was placebo-controlled and double-blind.

Is Pentamer/gB/Adjuvant vaccine FDA approved?

Pentamer/gB/Adjuvant vaccine is not FDA approved. It is an investigational vaccine currently in Phase 1 clinical development. The completed Phase 1 trial assessed safety and immune response, but the vaccine has not yet received regulatory approval for the prevention of Cytomegalovirus infections.