Our cohort includes both pediatric (BCR::ABL1-positive ALL: n = 353; CML: n = 197) and adult (BCR::ABL1-positive ALL: n = 166; CML: n = 255) patients, with part of the sequences published previously [3, 7–9]. The gene discussed is BCR; the disease is chronic myelogenous leukemia, BCR-ABL1 positive.