Use of Extracorporeal Photopheresis in Kidney Transplantation: Effects on Antibody-Mediated Rejection

Inclusion Criteria: * Kidney transplant recipients followed at the University Hospitals of Besançon and Lille between September 1, 2016, and August 31, 2023 * Patients with antibody-mediated rejection (as confirmed by histological analysis of the renal biopsy) * Rejection treated with extracorporeal photopheresis * Subjects who do not object to the use of their personal data and/or biological samples * Subjects affiliated with, or beneficiaries of, the French social security system Exclusion Criteria: * Patients with acute rejection * Pregnant women, women in labor, or breastfeeding mothers * Individuals deprived of liberty by judicial or administrative decision; individuals receiving compulsory psychiatric care; or individuals admitted to a healthcare or social institution for reasons other than research participation * Minors * Adults under legal protection or unable to provide informed consent * Subjects without health insurance coverage * Subjects currently within an exclusion period from another study, or as listed in the "national volunteer registry"