Chronic myeloid leukemia (CML), the most common myeloproliferative neoplasm, is characterized by the BCR-ABL1 gene fusion, resulting from a translocation between parts of the long arms of chromosomes 9 and 22, occurring during a single bone marrow cell division [1]. This evidence concerns the gene ABL1 and chronic myelogenous leukemia, BCR-ABL1 positive.