Approximately 25-50% of acute lymphoblastic leukemia (ALL) or acute myeloid leukemia (AML) cases comprise at least one fusion gene [2, 4], while over 90% chronic myeloid leukemia (CML) cases comprise BCR-ABL1 gene fusions [5]. The gene discussed is ABL1; the disease is chronic myelogenous leukemia, BCR-ABL1 positive.