There was no duplication of the Philadelphia chromosome (vs. 6/23 in CML-BP), no isochromosome 17q (vs. 2/23 CML-BP) and only 2/18 cases had a MECOM rearrangement (vs. 5/23 MECOMr in CML-BP). Here, MECOM is linked to chronic myelogenous leukemia, BCR-ABL1 positive.