Multicenter, Randomized, Phase III, Trial Assessing the Immunogenicity and Safety of Three Meningococcal B Vaccine Strategies Among Patients With Asplenia
Overview
- Phase
- Phase 3
- Intervention
- Trumenba®
- Conditions
- Splenectomy
- Sponsor
- Assistance Publique - Hôpitaux de Paris
- Enrollment
- 84
- Locations
- 1
- Primary Endpoint
- Proportion of responders defined as participants with seroconversion
- Status
- Recruiting
- Last Updated
- 5 months ago
Overview
Brief Summary
The purpose of the study is to evaluate the immunological response and tolerance of 3 vaccine strategies against meningococcus B, a potentially fatal invasive infection.
Detailed Description
Currently, in France, no immunogenicity data on Meningococcal B vaccines, neither with Bexsero® nor with Trumenba®, are available in asplenic patients, population at high risk of infection. As asplenic individuals (all causes) show less optimal immune response to conjugate meningococcal C vaccine compared to matched controls. \[4\], we hypothesize that a similar less optimal response may be expected for MenB vaccines among asplenic subjects. . That is why, we proposed in this study to evaluate two reinforced strategies with 3 administrations (M0, M1, and M6) of Bexsero® or Trumenba ®. Moreover, the study will also allow exploring the persistence of the immune response in this population. Indeed, few data are available on this persistence in the general population.
Investigators
Eligibility Criteria
Inclusion Criteria
- •Male or female, \>=18 to \<=75 years old.
- •Asplenic patient (for at least 2 weeks) with Howell Jolly bodies visible on blood film
- •Splenectomy confirmed by consultation and/or hospitalization report or the ultrasound if it has been performed during the routine follow-up
- •Women of childbearing age must have an effective contraception during the first 9 months of the study.
- •Participants must give written consent prior to any trial procedure
- •Participants must be covered by social security regimen or equivalent.
- •Participants will be followed during the 4 years from the inclusion visit.
Exclusion Criteria
- •History of meningococcal vaccination B.
- •History of anaphylaxis post vaccination.
- •Known allergy to any components (active substances or excipients) of both vaccines.
- •Patients who cannot stop antibiotics 3 days before blood collection.
- •Participants who have received any another vaccines within 4 weeks prior to immunization or who are planning to receive any vaccine within the first 7 months of the study (except the meningococcal ACWY vaccine, the anti-pneumococcal vaccine, the Haemophilus influenzae type B vaccine, the anti-Covid-19 vaccine), annual influenza vaccination which is permitted 2 weeks before and after each vaccination visit of the study and then allowed at any time during the study follow up).
- •Parenteral Ig within the 3 months prior to VS or planned during the study.
- •Chemotherapy agents within 6 months prior M0 or planning to take any during the study.
- •Steroids (\> 10mg/day; \> 14 days) within the month preceding M0 or planning to take any during the study.
- •Any pathology or condition that may impair the immune response, apart from splenectomy: immunosuppressive therapy in progress or in the 6 months prior to inclusion, hematopoietic stem cells allo / autograft, primary immunodeficiency, nephrotic syndrome, evolutive cancer, cirrhosis, known infection to HIV;
- •Thrombocytopenia or any coagulation disorder contra-indicating intramuscularly injections.
Arms & Interventions
Arm A : Trumenba®: Standard vaccination
Two doses of 0.5 ml each at one month intervals, followed by a third dose given at 6 months after the second dose.
Intervention: Trumenba®
Arm B:Bexsero®: standard vaccination regimen
Two doses of 0.5 ml each at one month intervals
Intervention: Bexsero®
Arm C : Bexsero® Innovative vaccine strategy
Two doses of 0.5 ml each at one month intervals, followed by a third dose given at 6 months after the second dose.
Intervention: Bexsero®
Outcomes
Primary Outcomes
Proportion of responders defined as participants with seroconversion
Time Frame: One month after the completeness of three anti-meningococci B vaccine strategies (at M7 for all arms) in asplenic adults.
Proportion of responders defined as participants with seroconversion (i.e. hSBA titer increases from \<4 before vaccination to at least 4) or with hSBA titer showing a 4-fold increase (if hSBA titer was at least 4 before vaccination) one month after the completeness of three anti-meningococci B vaccine strategies (at M7 for all arms) in asplenic adults.
Secondary Outcomes
- Persistence of immunogenicity(At M12 M24, M36 and M48)
- Any event or serious adverse event(7 days following each vaccination.)
- Modeling of the determinants of immunogenicity(during the trial)
- safety and effectiveness(through study completion)
- Immunogenicity(one month after the completeness of each vaccine strategy)