PS962 PHASE 1 RESULTS OF ZUMA-4: KTE-X19, AN ANTI-CD19 CHIMERIC ANTIGEN RECEPTOR T CELL THERAPY, IN PEDIATRIC AND ADOLESCENT PATIENTS WITH RELAPSED/REFRACTORY B CELL ACUTE LYMPHOBLASTIC LEUKEMIA. HemaSphere A.S. Wayne, V. Huynh, N. Hijiya, R. Rouce, P.A. Brown, J. Krueger, M. Rytting, C.L. Kitko, E. Dela Ziga, M. Hermiston, M.K. Richards, A. Baruchel, T. Shen, L. Goyal, R. Vezan, R. Jain, D.W. Lee
