Autolus Therapeutics' Aucatzyl, a CAR T-cell therapy targeting CD19, received FDA approval for treating adult B-cell precursor acute lymphoblastic leukemia (ALL). Aucatzyl differentiates itself with faster off-rate and lower complication rates, potentially improving safety and durability. The therapy's approval is based on a trial showing 42% complete remission within three months. Aucatzyl enters a market dominated by Amgen's Blincyto and Gilead's Tecartus, with potential for $300 million in peak sales.