Conclusions : Eighty-four percent of responders to obe-cel for whom MRD by NGS could be analyzed achieved MRD <10‾6 leukemic cells which was associated with more durable responses, and higher EFS and OS rates than those observed in pts with MRD ≥10‾4 and between 10‾4 and 10‾6 leukemic cells. Pts who did not achieve MRD <10‾6 had poorer outcomes.