TIXAGEVIMAB/CILGAVIMAB Protection of Covid-19 in Transplanted Patients

Withdrawn

• Conditions: Solid Organ Transplant Recipients
• Interventions: Biological: Blood and saliva samplings

• Registration Number: NCT05234398
• Lead Sponsor: Hospices Civils de Lyon

Brief Summary

Covid-19 has a very bad prognosis in solid organ transplant recipients with a 60 days-mortality exceeding 20%. For this reason, transplant patients were prioritized to receive Covid-19 vaccination since December 2020 in France. Unfortunately, the vaccine response of these patients is insufficient after a standard vaccine regimen including 2 doses of mRNA (messenger ribonucleic acid) vaccine with a 50% seroconversion rate in many cohorts. As a result, on the advice of the "Conseil National d'Orientation Vaccinale", the French Health Authorities has authorized physicians to offer a 3rd dose of vaccine to organ transplant patients since April 11, 2021. The subsequent studies showed that half of the patients who did not seroconvert after the 2nd dose did develop a vaccine response after the third dose. For patients who do not respond after the 3rd dose, the clinicians are now allowed to offer a 4th dose of vaccine.

Unfortunately, approximately 25% of patients still remain non-responders to this 3- or 4-doses vaccine regimen. In addition, transplant recipients who do not developed a vaccine response after the 3rd dose are very unlikely to respond after the 4th dose. For patients who do not respond to the vaccination, the French Health Authorities had authorized the infusion of SARS Cov2 (Severe Acute Respiratory Syndrome Coronavirus 2) monoclonal antibodies as a pre-exposition prophylaxis in immunocompromised patients.

The value of using the TIXAGEVIMAB/CILGAVIMAB monoclonal antibody cocktail as primary prophylaxis has been demonstrated in the general population but this study did not include immunocompromised patients.

Here, the investigators propose to study the pharmacokinetics of TIXAGEVIMAB/CILGAVIMAB given in a pre-exposition prophylaxis scheme in non-responder solid organ transplanted patients after an adapted vaccinal scheme (i.e. 3 doses or more of mRNA vaccines).

Detailed Description

Not available

Basic Information
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Recruitment & Eligibility
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Study & Design
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Trial Locations

Study Timeline

• Study Start: 2022-02
• Study First Submitted: 2022-02-08
• Study First Submitted QC: 2022-02-08
• Study First Posted: 2022-02-10
• Status Verified: 2022-08
• Last Update Submitted: 2022-08-29
• Last Update Posted: 2022-09-01
• Primary Completion: 2023-02
• Study Completion: 2023-08

Recruitment & Eligibility

• Status: WITHDRAWN
• Sex: All
• Target Recruitment: Not specified

Inclusion Criteria

• Male or female, 18 years of age or older
• Recipient of a solid organ transplant
• Subject affiliated with a health insurance company
• Patient able to understand the objectives and risks of the research and to give a non-objection
• Patient with a post-vaccination anti-Spike IgG (or RBD - Receptor Blinding Domain) titer of less than 30 BAU/ml ( (binding antibody units) measured at least 14 days after completion of an intensified vaccination regimen (at least 3 doses of mRNA vaccine) and prior to administration of anti-SARS-Cov-2 monoclonal antibodies.
• Group 1 criteria: Naïve patients, never having received anti-SARS CoV2 monoclonal antibodies.
• Group 2 criteria: Patients who have previously received anti-SARS Cov2 monoclonal antibodies

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Exclusion Criteria

• History of anaphylactic shock or known allergy to TIXAGEVIMAB/CILGAVIMAB
• Known history of Covid-19 or positive Covid-19 serology within 3 months prior to inclusion
• History of myocardial infarction or coronary artery disease within 3 months prior to inclusion
• Contraindication to an intramuscular injection
• Impossibility to give to the subject an informed information
• Subject under legal protection, guardianship or curatorship
• Plasmapheresis in progress or planned
• Weight less than 48 kg
• Patient participating in another interventional research study in progress
• Pregnant, parturient, or breastfeeding women

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Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
Switched patients	Blood and saliva samplings	This study involve non-responder solid organ transplanted patients after an adapted vaccinal scheme (i.e. 3 doses or more of mRNA vaccines). Patients included in Group 2 have previously received anti-SARS Cov2 monoclonal antibodies. They will have additional blood and saliva samplings during their study visits, which are included in their usual medical follow-up.
Naïve patients	Blood and saliva samplings	This study involve non-responder solid organ transplanted patients after an adapted vaccinal scheme (i.e. 3 doses or more of mRNA vaccines). Patients included in Group 1 are naïve patients; there have never received anti-SARS Cov2 monoclonal antibodies. They will have additional blood and saliva samplings during their study visits, which are included in their usual medical follow-up.

Primary Outcome Measures

Name	Time	Method
Percentage of patients whose serum has viral neutralization capacity in vitro at M6 after TIXAGEVIMAB/CILGAVIMAB injection.	At Month 6.	Viral neutralization capacity will be analyzed by performing in-vitro neutralization tests from blood samples of enrolled patients.; Samples will be analyzed centrally by virology Laboratory of Strasbourg Hospital throughout the study.

Trial Locations

Locations (2)

Service de Néphrologie et Transplantation, Hôpitaux Universitaires de Strasbourg; 🇫🇷 Strasbourg, France

Service de Néphrologie, Transplantation et Immunologie Clinique Hôpital Edouard Herriot - Hospices Civils de Lyon; 🇫🇷 Lyon, France