[Chimeric antigen receptor (CAR) T cells targeting CD19 for acute lymphoblastic leukemia].

Chimeric antigen receptor transgenic T cell (CAR-T) therapy targeting the CD19 antigen was approved for relapsed/refractory acute lymphocytic leukemia in the United States in 2017 and in Japan in 2019. Despite the excellent efficacy of CAR-T therapy, the relapse rate is about 50%. To reduce this rate, it will be important to examine predictive factors for relapse and which patients should receive hematopoietic cell transplantation. In addition, as the high cost of CAR-T cells has become a financial toxicity that threatens the health insurance system in many countries, development of less expensive CAR-T products using non-viral vectors is also underway.