Using BAC array comparative genome hybridization (CGH) on CML patients and cell lines, Brazma et al. [9] identified gains of 22q11.2 along with gains of BCR/ABL1 fusion and only part of the 9q34.1-qter region, therefore not corresponding to the presence of two typical Ph chromosomes. This evidence concerns the gene ABL1 and chronic myelogenous leukemia, BCR-ABL1 positive.