All patients with KMT2A and TCF3::PBX1 rearrangements achieved a CR...This phase II trial shows the benefit of adding blinatumomab for the management of Ph- B-ALL, with the primary objective being achieved with 93% of patients being MRDneg after the 1st cycle of blinatumomab. With a median follow-up of 37.5 months, OS and DFS are 71% and 66%, respectively, better than in historical results, particularly in patients up to the age of 55.