JAK2 and chronic myelogenous leukemia, BCR-ABL1 positive: We only identified one patient with two JAK2 V617Fneg/BCR::ABL1pos colonies potentially indicating acquisition of JAK2 V617F in a pre-existing BCR::ABL1pos CML or the scenario of two independent diseases but cannot rule out potential technical pitfalls because JAK2 V617F VAF was in fact high.