Chronic myelogenous leukemia (also called CML or chronic granulocytic leukemia) is a myeloproliferative disorder and most common blood cancer characterized by the presence of translocation t(9;22) (q34;q11), which generates the Philadelphia (Ph) chromosome and the associated fusion gene BCR::ABL1. This evidence concerns the gene BCR and chronic myelogenous leukemia, BCR-ABL1 positive.