In the EXP cohort, median time to response was 2 months, and median time to CR was 5.6 months. Median PFS was 12.8 months, and median OS was not reached (median follow-up 22.8 months). 65% of patients were alive at 15 months. 75% of 12 responders had undetectable MRD. Common non-hematologic TEAEs included CRS (96%), diarrhea (48%), and fatigue (43%). Cytopenias were common, but largely disease-related. Four fatal TEAEs occurred. The OPT cohort showed reduced CRS severity. High response rates were observed in patients with high-risk factors treated with epcoritamab.