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Flu mRNA

Phase 2

Influenza, Human | Monoclonal antibody | Infectious Disease |GSK plc|Last Updated: May 28, 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-BlindACTIVE_CONTROLLEDBiomarker
Total Trials2
Total Enrollment1,747
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07204964A Study to Evaluate the Immune Response and Safety of an Influenza Vaccine in Adults 18 Years of Age and AbovePHASE2 ACTIVE NOT_RECRUITING 971Oct 7, 2025Jul 31, 2026Mar 27, 202617 United States, Belgium
NCT07121192A Study to Assess the Immune Response and Safety of a Vaccine Against Influenza in Adults 18 Years of Age and OlderPHASE2 COMPLETED 776Aug 25, 2025May 11, 2026May 28, 202622 United States
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Study Endpoints
Primary Endpoints
Geometric Mean Titer (GMT) Of Antigen 1 Titer
At Day 29
Geometric Mean Increase (GMI) of Antigen 1 Titer
From Day 1 to Day 29
Percentage of Participants with Antigen 1 Seroconversion Rate (SCR)
From Day 1 to Day 29
Percentage of Participants with Antigen 1 Seroprotection Rate (SPR)
At Day 1 and Day 29
Number of Participants with Solicited Administration Site Adverse Events (AEs)
From Day 1 to Day 7

The solicited administration site AEs considered are pain, redness, swelling and lymphadenopathy.

Number of Participants with Solicited Systemic AEs
From Day 1 to Day 7

The solicited systemic AEs considered are fever, headache, fatigue, myalgia, arthralgia and chills. Fever is defined as temperature greater than or equal to (\>=) 38 °C/100.4 °F regardless the location of measurement.

Number of Participants with Unsolicited AEs
From Day 1 to Day 28

An unsolicited AE is an AE that was either not included in the list of solicited events or could be included in the list of solicited events but with an onset outside the specified period of follow-up for solicited events.

Number of Participants with Serious Adverse Events (SAEs)
From Day 1 to Day 181 (study end)

SAE is an AE which results in death, is life-threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in disability/incapacity, or other situations that are considered serious per medical or scientific judgment.

Number of Participants with Adverse Events of Special Interest (AESIs)
From Day 1 to Day 181 (study end)
Number of Participants with Medically Attended Adverse Events (MAAEs)
From Day 1 to Day 181 (study end)

A MAAE is an AE for which the participant received medical attention including any symptom or illness requiring hospitalization, or an emergency room visit, or visit to/by a healthcare professional.

Number of Participants with any Laboratory abnormalities
From Day 1 to Day 29
Geometric Mean Titer (GMT) Ratio of Antigen 1 Titer
At Day 29
Secondary Endpoints
GMT Ratio of Antigen 2 Titer
At Day 29
GMI of Antigen 2 Titer
From Day 1 to Day 29
Percentage of Participants with Antigen 2 SCR
From Day 1 to Day 29
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposePREVENTION
Treatment Arms
ArmTypeDescription
Flu mRNA_1_YAEXPERIMENTALEligible Younger Adults (YA) participants receive a single dose of Flu mRNA Formulation B1 (GSK6498032A) as study intervention at Day 1.
Flu mRNA_3_YAEXPERIMENTALEligible YA participants receive a single dose of Flu mRNA Formulation B3 (GSK6498032A) as study intervention at Day 1.
Flu mRNA_4_YAEXPERIMENTALEligible YA participants receive a single dose of Flu mRNA Formulation A (GSK6479720A) as study intervention at Day 1.
Comparator_1_YAACTIVE_COMPARATOREligible YA participants receive a single dose of comparator 1 at Day 1.
Comparator_2_YAACTIVE_COMPARATOREligible YA participants receive a single dose of comparator 2 at Day 1.
Flu mRNA_1_OAEXPERIMENTALEligible Older Adults (OA) participants receive a single dose of Flu mRNA Formulation B1 (GSK6498032A) as study intervention at Day 1.
Flu mRNA_3_OAEXPERIMENTALEligible YA participants receive a single dose of Flu mRNA Formulation B3 (GSK6498032A) as study intervention at Day 1.
Flu mRNA_4_OAEXPERIMENTALEligible YA participants receive a single dose of Flu mRNA Formulation A (GSK6479720A) as study intervention at Day 1.
Comparator_1_OAEXPERIMENTALEligible OA participants receive a single dose of comparator 1 at Day 1.
Comparator_2_OAACTIVE_COMPARATOREligible OA participants receive a single dose of comparator 3 at Day 1.
Flu mRNA_2_YAEXPERIMENTALEligible YA participants receive a single dose of Flu mRNA Formulation B (GSK6479715A) as study intervention at Day 1.
Flu mRNA_2_OAEXPERIMENTALEligible OA participants receive a single dose of Flu mRNA Formulation B (GSK6479715A) as study intervention at Day 1.
Comparator_3_OAACTIVE_COMPARATOREligible OA participants receive a single dose of comparator 3 at Day 1.
Interventions
NameTypeDescription
Flu mRNA (Formulation B1)BIOLOGICALOne dose of Flu mRNA (Formulation B1) received intramuscularly.
Flu mRNA (Formulation B3)BIOLOGICALOne dose of Flu mRNA (Formulation B3) received intramuscularly.
Flu mRNA(Formulation A)BIOLOGICALOne dose of Flu mRNA (Formulation A) received intramuscularly.
Comparator 1COMBINATION_PRODUCTOne dose of Comparator 1 received intramuscularly.
Comparator 2COMBINATION_PRODUCTOne dose of Comparator 2 received intramuscularly.
Comparator 3COMBINATION_PRODUCTOne dose of Comparator 3 received intramuscularly.
Flu mRNA (Formulation A)BIOLOGICALOne dose of Flu mRNA (Formulation A) received intramuscularly.
Flu mRNA (Formulation B)BIOLOGICALOne dose of Flu mRNA (Formulation B) received intramuscularly.
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersYes
Study Sites17

Inclusion Criteria: 1. Participants, who, in the opinion of the investigator, can and will comply with the requirements of the protocol (e.g., completion of the eDiary, attendance to study contacts and study site visits, and ability to access and utilize a phone or other electronic communications) ...

Countries:United StatesBelgium
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Recent Changes (Last 90 Days)
HIGHMay 29, 2026NCT07121192Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHMay 29, 2026NCT07121192Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHMay 29, 2026NCT07121192Status: ACTIVE_NOT_RECRUITING → COMPLETED
MEDIUMMay 26, 2026NCT07204964Status: RECRUITING → ACTIVE_NOT_RECRUITING
LOWMay 26, 2026NCT07121192primaryCompletionDate: changed
LOWMay 24, 2026NCT07204964studyFirstPostDate: changed
LOWMay 24, 2026NCT07121192studyFirstPostDate: changed