P616: LONG-TERM FOLLOW-UP UPDATE AND MULTIVARIABLE ANALYSES OF FACTORS ASSOCIATED WITH DURATION OF RESPONSE AFTER CD19 CAR T-CELL THERAPY FOR RELAPSED/REFRACTORY CLL oleh Emily Liang, Alexandre Hirayama, Erik Kimble, Andrew Portuguese, Aya Albittar, Aude Chapuis, Mazyar Shadman, Brian Till, Ryan Cassaday, Filippo Milano, Hans-Peter Kiem, Camesron Turtle, David Maloney, Jordan Gauthier