question: What is the mechanism of action of Tisagenlecleucel?
answer: Tisagenlecleucel CD19-directed chimeric antigen receptor T cells (CART19) product that cause reprogramming a patient's own T cells with a transgene encoding a chimeric antigen receptor to identify and eliminate CD19-expressing cells. Its is is approved for children and young adults with relapsed or refractory B-cell acute lymphoblastic leukemia.