Is Trogocytosis a Predictive Marker of CAR-T Cell Response in Diffuse Large B-cell Lymphoma?

CAR-T cell therapy has improved survival in patients with relapsed or refractory diffuse large B-cell lymphoma (DLBCL R/R). However, only 65% of patients achieve a complete metabolic response after this treatment. To date, there is no predictive test for therapeutic response after injection of CAR-T cells. Recent studies have shown that the level of trogocytosis by immune cells correlates with the persistence of tumor cells in patients with hematological malignancies. Our main objective is to identify a phenotypic "signature" of trogocytosis predictive of therapeutic response 6 months after injection of CAR-T cells for DLBCL.

Inclusion Criteria: * For patients * Patient who has given free and informed consent in writing for inclusion in the non-interventional CART-BANK protocol, and orally for the CARTROG protocol, * Patients over 18 years of age at the time of inclusion, * Diagnosis of LDGCB, * Decision to treat with anti-CD19 CAR-T cells, * Patient affiliated to or benefiting from a social security scheme. * For healthy volunteers: * Given free and informed oral consent for inclusion in the CARTROG protocol, * Donor between 18 and 70 years of age at the time of inclusion, * No history of solid cancer or hematological malignancy, * No known chronic pathology (e.g. hypertension, diabetes, etc.) and no daily treatment, * No surgical treatment within the last 6 months. Exclusion Criteria: * Patients who do not meet all the inclusion criteria, * Pregnant or breast-feeding patient, * Patient unable to follow the procedures and/or frequency of visits planned in the trial, for psychological, family, social or geographical reasons, * Patient unable to consent freely to inclusion, under guardianship, curatorship or safeguard of justice.