NCIt definition : A fusion gene that results from a translocation t(9;22)(q34;q11) that fuses the 5'
part of the BCR gene to the 5' side of exon 2 of the ABL1 gene. There are 3 potential
products that are formed depending on which BCR exon has the breakpoint. All of the
protein products have constitutively active tyrosine kinase activity. This fusion
is associated with both chronic myeloid leukemia and acute lymphoblastic leukemia.;
Alternative definition : NCI-GLOSS: A gene formed when pieces of chromosomes 9 and 22 break off and trade places.
The ABL gene from chromosome 9 joins to the BCR gene on chromosome 22, to form the
BCR-ABL fusion gene. The changed chromosome 22 with the fusion gene on it is called
the Philadelphia chromosome. The BCR-ABL fusion gene is found in most patients with
chronic myelogenous leukemia (CML), and in some patients with acute lymphoblastic
leukemia (ALL) or acute myelogenous leukemia (AML).;