Non-Invasive Monitoring of Pediatric Kidney Transplant Recipients and Immunosuppression Personalization: an Open-labeled Multicenter Randomized Controlled Study

MONITOR is an open label multicenter prospective randomized trial of superiority with two active comparators (4 parallel groups 1:1:1:1).

Arm A: monitoring by dd-cfDNA; Arm B: monitoring by T-Vis; Arm C: monitoring by dd-cfDNA+ T-Vis; Comparator arm: Current standard of care based on surveillance biopsies and biological monitoring

Main objectives and primary endpoints :

• To demonstrate that the use of an integrative score of allograft rejection including dd-cfDNA measurement allows the reduction of the number of surveillance biopsies.

Endpoint: Number of biopsy performed in each arm

• To demonstrate that steering immunosuppression based on Tvis numbers allows the reduction of the exposition to calcineurin inhibitors.

Endpoint: Tacrolimus exposure assessed as the mean of the residual concentration of Tacrolimus between M6 and M24

Inclusion criteria

• Age less than 21 years old at transplantation
• Single renal transplant from a deceased or a living donor.
• Absence of pregnancy confirmed by a negative pregnancy test in women in child-bearing period.
• Subject and legal guardians are willing and able to provide signed written informed consent and to comply with the study procedures
• Patients affiliated to health insurance system including Aide Médicale de l'Etat (AME)

Exclusion criteria

• History of multi-organ transplant (interference with rejection natural history)
• No surveillance biopsy planned
• Adult patient (or legal guardians) with limited understanding of the French language preventing him from receiving informed information on the protocol