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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
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_CONTROLLEDBiomarker
Total Trials1
Total Enrollment505
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
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 HerpesPHASE1 COMPLETED 505Mar 7, 2022Jun 12, 2025Sep 8, 202530 United States, Australia +6
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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 — 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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