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Non-adjuvanted HSV formulation 1

Phase 1

Herpes Simplex | Monoclonal antibody | Infectious Disease |GSK plc|Last Updated: Sep 8, 2025

Success Probability

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment505

FDA Designations

No designations recorded

Clinical trial landscape

Non-adjuvanted HSV formulation 1 · 1 trial · 1 indication

Phase 1 1
NCT05298254A Study on the Reactogenicity, Safety, Immune Response, and Efficacy of a Targeted Immunotherapy Against HSV in Healthy Participants Aged 18-40 Years or in Participants Aged 18-60 Years With Recurrent Genital HerpesHerpes Simplex
COMPLETED505 Analytics
PHASE1COMPLETED
A Study on the Reactogenicity, Safety, Immune Response, and Efficacy of a Targeted Immunotherapy Against HSV in Healthy Participants Aged 18-40 Years or in Participants Aged 18-60 Years With Recurrent Genital Herpes
Herpes SimplexUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of participants reporting each solicited administration site event
Within 7 days after the first study intervention dose (administered at Day 1)

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

Percentage of participants reporting each solicited systemic event
Within 7 days after the first study intervention dose (administered at Day 1)

The solicited systemic events are fever, fatigue, headache, myalgia and arthralgia. The preferred location for measuring temperature is the oral cavity. Fever is defined as temperature equal to or above (≥) 38.0 degree Celsius (°C)/ 100.4 degree Fahrenheit (°F), regardless the location of measurement.

Percentage of participants reporting unsolicited adverse events (AEs)
Within 28 days after the first study intervention dose (administered at Day 1)

An unsolicited AE is any AE reported in addition to those solicited during the clinical study. Also, any 'solicited' symptom with onset outside the specified period of follow-up for solicited symptoms (7 days after each dose) is reported as an unsolicited AE.

Percentage of participants reporting medically attended events (MAEs)
From Dose 1 (Day 1) up 12 months after last study intervention administration (Day 394)

An MAE is an unsolicited AE for which the participants received medical attention defined as any symptoms or illnesses requiring hospitalization, or an emergency room visit, or visit to/by healthcare professionals.

Percentage of participants reporting any serious adverse events (SAEs)
From Dose 1 (Day 1) up to 12 months after last study intervention administration (Day 394)

An 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 results in abnormal pregnancy outcomes.

Percentage of participants reporting any potential immune-mediated disease (pIMDs) (classified as newly diagnosed or exacerbation of pre-existing events)
From Dose 1 (Day 1) up to 12 months after last study intervention administration (Day 394)

PIMDs are a subset of adverse events of special interest (AESIs) that include autoimmune diseases and other inflammatory and/or neurologic disorders of interest which may or may not have an autoimmune aetiology.

Percentage of participants reporting any haematological and biochemical laboratory abnormalities at pre-study intervention administration (Day 1) in Part I of the study
At pre-study intervention administration (Day 1)

Clinically significant haematological and biochemical abnormal laboratory findings are those which are not associated with an underlying disease, unless judged by the investigator to be more severe than expected for the participant's condition.

Percentage of participants reporting any haematological and biochemical laboratory abnormalities at Day 8 in Part I of the study
At Day 8
Percentage of participants reporting any haematological and biochemical laboratory abnormalities at Day 29 in Part I of the study
At Day 29
Percentage of participants reporting any haematological and biochemical laboratory abnormalities at Day 36 in Part I of the study
At Day 36
Percentage of participants reporting any haematological and biochemical laboratory abnormalities at Day 64 in Part I of the study
At Day 64
Percentage of participants reporting any haematological and biochemical laboratory abnormalities at pre-study intervention administration (Day 1) in Part II of the study
At pre-study intervention administration (Day 1)
Percentage of participants reporting any haematological and biochemical laboratory abnormalities at Day 8 in Part II of the study
At Day 8
Percentage of participants reporting any haematological and biochemical laboratory abnormalities at Day 29 in part II of the study
At Day 29
Percentage of participants reporting any haematological and biochemical laboratory abnormalities at Day 36 in Part II of the study
At Day 36
Percentage of participants reporting any haematological and biochemical laboratory abnormalities at Day 57 in Part II of the study
At Day 57
Time-to-first confirmed HSV-2 RGH episode in Part II of the study
14 days post-Dose 2 (Day 43) to end of RGH event reporting period

A suspected RGH episode will be classified as confirmed HSV-2 RGH episode if at least one of the lesional or anogenital swabs taken during the concerned episode is positive for HSV-2 as measured by PCR. The end of RGH reporting can occur at Day 209 for participants who have not yet completed Visit 8 \[Day 209\] at the time the Informed Consent Form (ICF) addendum was signed and consented, or at non-scheduled time, being defined by the date on which participants decided to stop the RGH reporting after acknowledgement of unsuccessful primary analysis before ICF addendum consent or the day the eDiary is deactivated after ICF addendum consent.

Secondary Endpoints

Number of confirmed HSV-2 RGH episodes in Part II of the study
14 days post-Dose 2 (Day 43) to end of RGH event reporting period
Percentage of participants free from confirmed HSV-2 RGH episode in Part II of the study
At 6 months after the last study intervention administration (Day 29)
Herpes Symptoms Checklist (HSC) total score during each confirmed HSV-2 RGH episode in Part II of the study
14 days post-Dose 2 (Day 43) to end of RGH event reporting period
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Non-adjuvanted HSV formulation 1 - Part I GroupEXPERIMENTALParticipants enrolled in Part I of the study who receive 2 doses of the non-adjuvanted HSV formulation 1 vaccine, one at Day 1 and one at Day 29.
Non-adjuvanted HSV formulation 2 - Part I GroupEXPERIMENTALParticipants enrolled in Part I of the study who receive 2 doses of the non-adjuvanted HSV formulation 2 vaccine, one at Day 1 and one at Day 29.
Non-adjuvanted HSV formulation 3 - Part I GroupEXPERIMENTALParticipants enrolled in Part I of the study who receive 2 doses of the non-adjuvanted HSV formulation 3 vaccine, one at Day 1 and one at Day 29.
HSV formulation 1 with adjuvant 1 - Part I GroupEXPERIMENTALParticipants enrolled in Part I of the study who receive 2 doses of the HSV formulation 1 with adjuvant 1 vaccine, one at Day 1 and one at Day 29.
HSV formulation 2 with adjuvant 1 - Part I GroupEXPERIMENTALParticipants enrolled in Part I of the study who receive 2 doses of the HSV formulation 2 with adjuvant 1 vaccine, one at Day 1 and one at Day 29.
HSV formulation 3 with adjuvant 1 - Part I GroupEXPERIMENTALParticipants enrolled in Part I of the study who receive 2 doses of the HSV formulation 3 with adjuvant 1 vaccine, one at Day 1 and one at Day 29.
HSV formulation 1 with adjuvant 2 - Part I GroupEXPERIMENTALParticipants enrolled in Part I of the study who receive 2 doses of the HSV formulation 1 with adjuvant 2 vaccine, one at Day 1 and one at Day 29.
HSV formulation 2 with adjuvant 2 - Part I GroupEXPERIMENTALParticipants enrolled in Part I of the study who receive 2 doses of the HSV formulation 2 with adjuvant 2 vaccine, one at Day 1 and one at Day 29.
HSV formulation 3 with adjuvant 2 - Part I GroupEXPERIMENTALParticipants enrolled in Part I of the study who receive 2 doses of the HSV formulation 3 with adjuvant 2 vaccine, one at Day 1 and one at Day 29.
Placebo - Part I GroupPLACEBO_COMPARATORParticipants enrolled in Part I of the study who receive 2 doses of Placebo, one at Day 1 and one at Day 29.
HSVTI formulation (F) 1 - Part II GroupEXPERIMENTALParticipants enrolled in Part II of the study who receive 2 doses of the formulation of the HSVTI\_F1 selected from Part I of the study, one at Day 1 and one at Day 29.
HSVTI_F2 - Part II GroupEXPERIMENTALParticipants enrolled in Part II of the study who receive 2 doses of the HSVTI\_F2 selected from Part I of the study, one at Day 1 and one at Day 29.
Placebo - Part II GroupPLACEBO_COMPARATORParticipants enrolled in Part II of the study who receive 2 doses of Placebo, one at Day 1 and one at Day 29.

Interventions

NameTypeDescription
Non-adjuvanted HSV formulation 1BIOLOGICALTwo doses of the non-adjuvanted HSV formulation 1 vaccine administered intramuscularly in the deltoid region of the non-dominant arm, one each at Day 1 and Day 29, during Part I of the study.
Non-adjuvanted HSV formulation 2BIOLOGICALTwo doses of the non-adjuvanted HSV formulation 2 vaccine administered intramuscularly in the deltoid region of the non-dominant arm, one each at Day 1 and Day 29, during Part I of the study.
Non-adjuvanted HSV formulation 3BIOLOGICALTwo doses of the non-adjuvanted HSV formulation 3 vaccine administered intramuscularly in the deltoid region of the non-dominant arm, one each at Day 1 and Day 29, during Part I of the study.
HSV formulation 1 with adjuvant 1BIOLOGICALTwo doses of the HSV formulation 1 with adjuvant 1 vaccine administered intramuscularly in the deltoid region of the non-dominant arm, one each at Day 1 and Day 29, during Part I of the study.
HSV formulation 2 with adjuvant 1BIOLOGICALTwo doses of the HSV formulation 2 with adjuvant 1 vaccine administered intramuscularly in the deltoid region of the non-dominant arm, one each at Day 1 and Day 29, during Part I of the study.
HSV formulation 3 with adjuvant 1BIOLOGICALTwo doses of the HSV formulation 3 with adjuvant 1 vaccine administered intramuscularly in the deltoid region of the non-dominant arm, one each at Day 1 and Day 29, during Part I of the study.
HSV formulation 1 with adjuvant 2BIOLOGICALTwo doses of the HSV formulation 1 with adjuvant 2 vaccine administered intramuscularly in the deltoid region of the non-dominant arm, one each at Day 1 and Day 29, during Part I of the study.
HSV formulation 2 with adjuvant 2BIOLOGICALTwo doses of the HSV formulation 2 with adjuvant 2 vaccine administered intramuscularly in the deltoid region of the non-dominant arm, one each at Day 1 and Day 29, during Part I of the study.
HSV formulation 3 with adjuvant 2BIOLOGICALTwo doses of the HSV formulation 3 with adjuvant 2 vaccine administered intramuscularly in the deltoid region of the non-dominant arm, one each at Day 1 and Day 29, during Part I of the study.
PlaceboDRUGTwo doses of Placebo administered intramuscularly in the deltoid region of the non-dominant arm, one each at Day 1 and Day 29, during Part I and Part II of the study.
HSVTI_F1BIOLOGICALTwo doses of the formulation of the HSVTI\_F1 selected from Part I of the study administered intramuscularly in the deltoid region of the non-dominant arm, one each at Day 1 and Day 29, during Part II of the study.
HSVTI_F2BIOLOGICALTwo doses of the formulation of the HSVTI\_F2 selected from Part I of the study administered intramuscularly in the deltoid region of the non-dominant arm, one each at Day 1 and Day 29, during Part II of the study.
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Eligibility Criteria

Age Range18 Years to 60 Years
SexALL
Healthy VolunteersYes
Study Sites30

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. * Women of non-childbearing potential can be enrol...

Countries:United StatesAustraliaBelgiumCanadaEstoniaGermanySpainUnited Kingdom
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Frequently asked questions about Non-adjuvanted HSV formulation 1

What is Non-adjuvanted HSV formulation 1 used for?

Non-adjuvanted HSV formulation 1 is an investigational monoclonal antibody being developed for herpes simplex. It is being studied as a targeted immunotherapy for recurrent genital herpes and for immune response in healthy participants aged 18 to 40 years. The drug is in Phase 1 clinical development and is not yet approved.

Who makes Non-adjuvanted HSV formulation 1?

Non-adjuvanted HSV formulation 1 is being developed by GSK plc, a biopharmaceutical company traded on the New York Stock Exchange under the ticker GSK. The company is conducting clinical research on this investigational therapy for herpes simplex.

What phase is Non-adjuvanted HSV formulation 1 in?

Non-adjuvanted HSV formulation 1 is in Phase 1 clinical development. It is an investigational drug, meaning it has not been approved by regulatory authorities. The Phase 1 trial has been completed, and the drug remains under clinical investigation for herpes simplex.

What clinical trials is Non-adjuvanted HSV formulation 1 in?

Non-adjuvanted HSV formulation 1 has one completed Phase 1 trial, identified as NCT05298254. This study evaluated reactogenicity, safety, immune response, and efficacy in healthy participants aged 18 to 40 years and in participants aged 18 to 60 years with recurrent genital herpes. The trial enrolled 505 participants across multiple countries.

How does Non-adjuvanted HSV formulation 1 work?

Non-adjuvanted HSV formulation 1 is a monoclonal antibody, a type of targeted immunotherapy. It is being studied for its ability to generate an immune response against herpes simplex virus. The specific molecular target of this antibody has not been disclosed in available information.