Evaluation of the Safety of Use of Anti-IL6 Receptor Antibodies to Reduce Allo-sensitization Post Allograft Nephrectomy

Study Overview
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Brief Summary
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Graft nephrectomy is associated with massive allo-sensitization following this event. The occurrence of anti-HLA antibodies is a major barrier to perform a second kidney transplantation. Investigators propose here to evaluate in a phase II pilot study, the safety of the use of a single dose of Tocilizumab immediately before or after graft nephrectomy. The primary endpoint evaluated here is the occurrence of serious infectious complications following graft nephrectomy, with a treatment by Tocilizumab. Secondary endpoints evaluated here are - to evaluate all complications after graft nephrectomy, - and the Tocilizumab effectiveness to reduce anti-HLA antibodies at one year post nephrectomy.

Detailed Description
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Background: graft nephrectomy is associated with massive allo-sensitization following this event The occurrence of anti-HLA antibodies is a major barrier to perform a second kidney transplantation. Moreover, a systemic inflammatory response syndrome can occur which could lead to serious patient's complications, in case of early graft thrombosis. To date, no treatment or strategy is available to reduce these risks, after graft nephrectomy. IL-6 is a key cytokine in inflammation, but also in the development of T and B cells activation. This treatment previously demonstrated a major role in the occurrence of allo-antibodies. Tocilizumab is a monoclonal antibody blocking IL6 receptor, previously used with success in kidney transplantation to reduce anti-HLA antibodies mediated rejection. Objectives: Investigators hypothesize that Tocilizumab is useful to prevent allo-sensitization post graft nephrectomy. They propose here to evaluate in a phase II pilot study, the safety of the use of a single dose of Tocilizumab immediately before or after graft nephrectomy.

Official Title
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Evaluation of the Safety of Use of Anti-IL6 Receptor Antibodies to Reduce Allo-sensitization Post Allograft Nephrectomy ; a Pilot Phase II Study.

Conditions
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Kidney Transplantation, Graft Failure

Intervention / Treatment
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* Drug: Tocilizumab


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Adult recipients, affiliated to the social security requiring a graft nephrectomy, with a project to retransplantation Exclusion Criteria: combined transplantations, PRA >20%. Patient under protective measures, Rituximab used for immunosuppression induction Previous transplants not removed, Active infectious complications at graft nephrectomy, need for immunosuppressive treatments after graft nephrectomy, Participation to another interventional studies using Rituximab, polyclonal antibodies, Eculizumab, or Tocilizumab. adults under guardianship or other legal protection, deprived of their liberty by judicial or administrative decision, pregnancy or breastfeeding.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Tocilizumab<br>Evaluation of the use of Tocilizumab after allograft nephrectomy. | Drug: Tocilizumab<br>* Tocilizumab will be administered at 8 mg/kg before or immediately after graft nephrectomy.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| serious infectious complication | serious infectious complication rate at 1 year post graft nephrectomy | 1 year post graft nephrectomy | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Complications after treatment | Safety excluding serious infectious complications one year after nephrectomy, used by: The occurrence of post-nephrectomy complications The occurrence of death The occurrence of hospitalizations The occurrence of surgical complications The occurrence of infectious complications (mild and moderate) | 1 year post graft nephrectomy | 
| The effectiveness of the treatment | The effectiveness of the treatment assessed by the rate of immunization after a post nephrectomy | 1 year post graft nephrectomy | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Kidney transplantation, allosensitization, graft nephrectomy, Donor-Specific Antibodies