Determinants of CD19-positive vs CD19-negative relapse after tisagenlecleucel for B-cell acute lymphoblastic leukemia.

Tisagenlecleucel therapy has shown promising efficacy for relapsed/refractory (R/R) B-cell precursor acute lymphoblastic leukemia (BCP-ALL). However, relapses occur in 30-50% of patients. Determinants for CD19 versus CD19 relapses are poorly characterized.

[A standardized medical report template for CAR T-Cell therapy patients: Guidelines of the Francophone Society of Bone Marrow Transplantation and Cellular Therapy (SFGM-TC)].

Tisagenlecleucel (Kymriah™) and axicabtagene ciloleucel (Yescarta™) are the first representatives of a new class of gene therapies produced by ex-vivo genetic modification of human autologous T lymphocytes, now using viral vectors. In 2020, there are three independent CAR-T cell databases in France: DESCAR-T (database supported by LYSARC, GRAALL and the IFM), ProMISe (EBMT database) and ATIH (database of the Agence Technique de l'Information sur l'Hospitalisation). Only the EBMT database is common to France and the French-speaking countries that are members of the SFGM-TC.

[Reporting data of patients receiving CAR T cell therapy into the EBMT registry: Guidelines of the Francophone Society of Bone Marrow Transplantation and Cellular Therapy (SFGM-TC)].

Tisagenlecleucel (Kymriah™) and axicabtagene ciloleucel (Yescarta™) are the first two approved drug products that belong to of a new class of therapies manufactured through an industrial process that includes the ex vivo genetic modification of human autologous T lymphocytes with viral vectors. Since CAR-T Cells qualify as gene therapy medicinal products, there is a requirement for long-term (15 years) follow-up of treated patients. As part of a global initiative aiming at a better use of continental registries to study the outcome of homogeneous groups of patients, EMA issued a positive opinion on the use of the EBMT registry to capture LTFU of patients treated with CAR-T Cell in EU Member states.

[Not Available].

CURRENT INDICATIONS IN CHILDREN AND PERSPECTIVES: Acute lymphoblastic leukemia (ALL) is the first cause of cancer in children. Five-year overall survival is greater than 90% but leukemia remains a major cause of death from cancer in children. A new class of immunotherapy based on a chimeric antigen receptor "CAR" targeting the CD19 on the B leukemic cells and that is transduced in an autologous or allogenic T lymphocyte will allow to transform the prognosis of refractory or relapsed B-ALL.