Quantify the Benefits of Biomarkers in Routine Patient Care in Kidney Transplant Recipients

The investigator hypothesize that the combined use of (1) non-invasive biomarkers in peripheral blood predicting anti-donor immunological activation or quiescence (2) interactive and actionable data analytics delivered at the bedside will promote safe clinical follow-up of kidney transplant patients with less need for invasive and induced risk surveillance by allograft protocol biopsies to assess allograft rejection in clinically stable kidney transplant patients. It is therefore proposed an European, multicenter, prospective randomized comparing two strategies of follow-up: in the first, biopsies are guided by biomarkers, in the second one, a routine biopsy is performed at M3. In both groups, a biopsy is performed at M12 and whenever considered necessary by the clinician.

The main objective of this study is to demonstrate the ability of use of non-invasive biomarkers to decrease the number of allograft biopsies during the first year after transplantation. 300 new transplanted patients in the 7 clinical transplant sites will be included in the prospective multicentre EU-TRAIN Impact study with centralized storage of samples in CHUN (blood mRNA), ICS (blood cellular assays), Saint -Louis Hospital (blood anti-HLA DSA, and non-HLA antibodies), INSERM (Biopsy mRNA). Recruitment of patients will start on the day of transplantation (d-8 for transplantation from living donors) and data/samples collected over the first year following transplantation. Realization of all the acts for the research are representing the usual medical practice (Standard Of Care: SOC) except six additional blood samples that will be collected and analyzed specifically for the research and additional analysis done specifically for the research on half of one of the two biopsy cores from the recipient. 3 additional blood samples from the living donor will also be collected and analyzed specifically for the research (timepoint of the sampling: anytime from 8 days to the day of transplant.