Out of eighty–four CML patients, the microdeletions of ASS1, EXOSC2, FNBP1 and FUBP3 genes were detected in seven (8.3%), twelve (14.2%), seven (8.3%), and nineteen (22%) patients, respectively (Figure 1A–D). This evidence concerns the gene FNBP1 and chronic myelogenous leukemia, BCR-ABL1 positive.