Similarly, in a study by Cario et al., 46 pediatric B-ALL patients with ABL-class fusions treated according to AIEOP-BFM protocols showed high rates of MRD (≥5 × 10–4) positivity (71.4 and 51.2% after induction and consolidation, respectively) [43]. Here, ABL1 is linked to precursor B-cell acute lymphoblastic leukemia.