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Pentavalent Meningococcal ABCYW vaccine

Phase 1

Meningococcal Immunization | Monoclonal antibody | Other |Sanofi|Last Updated: Jan 20, 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_CONTROLLEDDMC
Total Trials1
Total Enrollment750
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06647407Safety and Immunogenicity of an Investigational Pentavalent Meningococcal ABCYW Vaccine Against Meningococcal Disease in Children, Toddlers, and InfantsPHASE1 ACTIVE NOT_RECRUITING 750Nov 5, 2024May 17, 2027Jan 20, 202639 Brazil, Czechia +7
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Study Endpoints
Primary Endpoints
Number of participants with unsolicited immediate adverse events (AEs)
Within 30 minutes after each vaccination

Unsolicited systemic AEs that occur within 30 minutes after vaccination

Number of participants with solicited injection site reactions or systemic reactions
Within 7 days after each vaccination

Pre-defined solicited injection site reactions and systemic reactions that are pre-listed in the diary cards and CRF

Number of participants with unsolicited AEs
Within 30 days after each vaccination

Unsolicited AEs other than solicited reactions

Number of participants with serious adverse events (SAEs)
Throughout the study, from first visit until 180 days after the last vaccination

SAEs (including adverse events of special interest \[AESIs\]) reported throughout the study

hSBA meningococcal serogroups A, C, W, and Y antibody titers pre-dose and 30 days after the second and third dose in infant participants
For Stage 3: Day 1, Day 91, Day 301-361, Day 331-391

hSBA titers ≥ 1:8 post-vaccination (post-second and third dose)

hSBA meningococcal serogroups A, C, W, and Y vaccine seroresponse pre-dose and 1 month after the second and third dose in infant participants
For Stage 3: Day 1, Day 91, Day 301-361, Day 331-391

Seroresponse defined as post-vaccination titers ≥ 1:16 for participants with pre-vaccination hSBA titers \< 1:4 or or postvaccination titers ≥ 4 times the lower limit of quantification (LLOQ) for participants with a pre-vaccination titer ≤ LLOQ or a post-vaccination titer ≥ 4 times the pre-vaccination titer for participants with a pre-vaccination titer ≥ LLOQ

Geometric mean titers (GMTs) of Antibodies against Meningococcal Serogroups A, C, W and Y pre-dose and 1 month after the second and third dose in infant participants
For Stage 3: Day 1, Day 91, Day 301-361, Day 331-391

Geometric mean titers (pre-dose and post-second and third dose)

Percentage of participants with hSBA titers more or equal to lower limit of quantification (LLOQ) against each of serogroups A, C, W, and Y pre-dose and 1 month after the second and third dose in infant participants
For Stage 3: Day 1, Day 91, Day 301-361, Day 331-391
Percentage of Participants With Meningococcal Antibody Titers against meningococcal serogroup B (reference MenB strains) ≥ 1:4 pre-dose and 1 month after second dose of vaccination against serogroup B, before and 30 days after third dose in infants
For Stage 3: Day 1, Day 91, Day 301-361, Day 331-391

hSBA titers ≥ 1:4 for reference MenB strains

Percentage of Participants With Meningococcal Antibody Titers against meningococcal serogroup B (reference MenB strains) ≥ 1:8 pre-dose and 1 month after the second dose of vaccination against serogroup B, before and 30 days after third dose in infants
For Stage 3: Day 1, Day 91, Day 301-361, Day 331-391

hSBA titers ≥ 1:8 for reference MenB strains

hSBA meningococcal serogroup B seroresponse pre-dose and 1 month after the second dose of vaccination against serogroup B, before and 30 days after third dose in infant participants
For Stage 3: Day 1, Day 91, Day 301-361, Day 331-391

Seroresponse defined as a 4-fold increase in hSBA titers

Geometric mean titers (GMTs) of Antibodies against Meningococcal Serogroup B (reference MenB strains) pre-dose and 1 month after the second dose of vaccination against serogroup B, before and 30 days after third dose in infant participants
Day 01, Day 91, Day 181 and Day 211 (for Stage 3)

Geometric mean titers (pre-dose and post-second dose) for the reference MenB strains

Percentage of participants with hSBA titers more or equal to lower limit of quantification (LLOQ) against each and all of serogroup B (ref. MenB strains) predose and 1 month after 2nd dose against serogroup B, before and 30 days after 3rd dose in infants
For Stage 3: Day 1, Day 91, Day 301-361, Day 331-391
Percentage of participants with hSBA titers less than LLOQ against all serogroup B (ref. MenB strains) pre-dose and 1 month after the 2nd dose of vaccination against serogroup B, before and 30 days after 3rd dose in infants
For Stage 3: Day 1, Day 91, Day 301-361, Day 331-391
hSBA meningococcal serogroups A, C, W, and Y antibody titers in children and toddlers
For Stage 1 and 2: Day 1, Day 31, Day 181, Day 211

hSBA titers ≥ 1:8 for serogroups A, C, W, and Y

hSBA meningococcal serogroups A, C, W, and Y vaccine seroresponse in children and toddlers
For Stage 1 and 2: Day 1, Day 31, Day 181, Day 211

Seroresponse defined as post-vaccination titers ≥ 1:16 for participants with pre-vaccination hSBA titers \< 1:4 or or postvaccination titers ≥ 4 times the lower limit of quantification (LLOQ) for participants with a pre-vaccination titer ≤ LLOQ or a post-vaccination titer ≥ 4 times the pre-vaccination titer for participants with a pre-vaccination titer ≥ LLOQ

Geometric mean titers (GMTs) of Antibodies against Meningococcal Serogroups A, C, W and Y pre-dose and 1 month after the second dose children and toddlers
For Stage 1 and 2: Day 1, Day 31, Day 181, Day 211
Percentage of participants with hSBA titers more or equal to lower limit of quantification (LLOQ) against each of serogroups A, C, W, and Y children and toddlers
For Stage 1 and 2: Day 1, Day 31, Day 181, Day 211
Percentage of Participants With Meningococcal Antibody Titers against meningococcal serogroup B (reference MenB strains) ≥ 1:4 in children and toddlers
For Stage 1 and 2: Day 1, Day 31, Day 181, Day 211
Percentage of Participants With Meningococcal Antibody Titers against meningococcal serogroup B (reference MenB strains) ≥ 1:8 in children and toddlers
For Stage 1 and 2: Day 1, Day 31, Day 181, Day 211
hSBA meningococcal serogroup B (reference MenB strains) vaccine seroresponse in children and toddlers
For Stage 1 and 2: Day 1, Day 31, Day 181, Day 211

Seroresponse defined as a 4-fold increase in hSBA titers

Geometric mean titers (GMTs) of Antibodies against Meningococcal Serogroup B (reference MenB strains) in children and toddlers
For Stage 1 and 2: Day 1, Day 31, Day 181, Day 211
Percentage of participants with hSBA titers more or equal to lower limit of quantification (LLOQ) against each and all of serogroup B (reference MenB strains) in children and toddlers
For Stage 1 and 2: Day 1, Day 31, Day 181, Day 211
Percentage of participants with hSBA titers less than the lower limit of quantification (LLOQ) against all serogroup B (reference MenB strains) in children and toddlers
For Stage 1 and 2: Day 1, Day 31, Day 181, Day 211
Secondary Endpoints
hSBA meningococcal serogroup B (additional MenB strains) vaccine seroresponse in children, toddler and infant participants
Stage 1 and 2: Day 1 and Day 211. Stage 3: Day 1, Day 331-391
Percentage of Participants With Meningococcal Antibody Titers against meningococcal serogroup B (additional MenB strains) ≥ 1:4 in children, toddler and infant participants
Stage 1 and 2: Day 1 and Day 211. Stage 3: Day 1, Day 331-391
Percentage of Participants With Meningococcal Antibody Titers against meningococcal serogroup B (additional MenB strains) ≥ 1:8 in children, toddler and infant participants
Stage 1 and 2: Day 1 and Day 211. Stage 3: Day 1, Day 331-391
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposePREVENTION
Treatment Arms
ArmTypeDescription
Stage 1: MenPenta vaccine formulation 1EXPERIMENTALMenPenta vaccine formulation 1, children 2-9 years of age
Stage 1: MenPenta vaccine formulation 2EXPERIMENTALMenPenta vaccine formulation 2, children 2-9 years of age
Stage 1: vaccine comparator(s)ACTIVE_COMPARATORComparator vaccines: Bexsero + MenQuadfi, children 2-9 years of age
Stage 2: MenPenta vaccine formulation 1EXPERIMENTALMenPenta vaccine formulation 1 + routine vaccines, toddlers 12-15 months of age
Stage 2: MenPenta vaccine formulation 2EXPERIMENTALMenPenta vaccine formulation 2 + routine vaccines, toddlers 12-15 months of age
Stage 2: vaccine comparator(s)ACTIVE_COMPARATORComparator vaccines: Bexsero + MenQuadfi + routine vaccines, toddlers 12-15 months of age
Stage 3: MenPenta vaccine formulation 1EXPERIMENTALMenPenta vaccine formulation 1 + routine vaccines, infants approximately 2 months of age
Stage 3: MenPenta vaccine formulation 2EXPERIMENTALMenPenta vaccine formulation 2 + routine vaccines, infants approximately 2 months of age
Stage 3: vaccine comparator(s)ACTIVE_COMPARATORComparator vaccines: Bexsero + Nimenrix + routine vaccines, infants approximately 2 months of age
Interventions
NameTypeDescription
Pentavalent Meningococcal ABCYW vaccineBIOLOGICALPharmaceutical form: Suspension for injection Route of administration: Intramuscular (IM)
MenACYW conjugate vaccineBIOLOGICALPharmaceutical form: Solution for injection in vial Route of administration: Intramuscular (IM)
Meningococcal group B vaccineBIOLOGICALPharmaceutical form: Suspension for injection in pre-filled syringe Route of administration: Intramuscular (IM)
ParacetamolDRUGPharmaceutical form:Suspension-Route of administration:oral
DTap-HepB-IPV-Hib vaccineBIOLOGICALPharmaceutical form: Suspension for injection in pre-filled syringe Route of administration: Intramuscular (IM)
Rotavirus vaccineBIOLOGICALPharmaceutical form: Suspension for injection in pre-filled syringe Route of administration: Intramuscular (IM)
Pneumococcal 13-valent conjugate vaccineBIOLOGICALPharmaceutical form: Suspension for injection in pre-filled syringe Route of administration: Intramuscular (IM)
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Eligibility Criteria
Age Range56 Days — 9 Years
SexALL
Healthy VolunteersYes
Study Sites39

Inclusion Criteria: * Aged 2 to 9 years (Stage 1) or 12 to 15 months (Stage 2) or 56 to 89 days (Stage 3) on the day of inclusion * For infants and toddlers, born at full term of pregnancy (≥37 weeks) and with a birth weight ≥ 2.5 Kg or born after a gestation period of period above 28 (\> 28 weeks)...

Countries:BrazilCzechiaDenmarkFinlandGermanyHondurasPolandSpainUnited Kingdom
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT06647407primaryCompletionDate: changed
LOWMay 24, 2026NCT06647407studyFirstPostDate: changed