Chronic myelogenous leukemia (CML) is a clonal myeloproliferative neoplasm caused by constitutive activation of the BCR-ABL1 tyrosine kinase, a result of the t(9;22)(q34;q11) translocation designated the Philadelphia (Ph) chromosome [1]. This evidence concerns the gene BCR and chronic myelogenous leukemia, BCR-ABL1 positive.