A BCR-ABL p190 variant, where BCR exon 1 is fused to ABL exon 2, is more frequently found in pediatric ALL and AML, and BCR-ABL p230, where BCR exon 19 is found exon 2 of ABL is seen in neutrophilic CML [16]. This evidence concerns the gene ABL1 and chronic myelogenous leukemia, BCR-ABL1 positive.