CML diagnosis requires the demonstration of the Philadelphia chromosome, the BCR-ABL1 fusion gene, or the BCR-ABL1 fusion messenger ribonucleic acid (mRNA) by conventional cytogenetics, FISH analysis, or reverse transcription-polymerase chain reaction (RT-PCR) [3,9]. This evidence concerns the gene ABL1 and chronic myelogenous leukemia, BCR-ABL1 positive.