NCIt definition : A fusion gene ( 12 kb) that results from a chromosomal translocation t(4;11)(q21;q23)
which fuses the 5' half of the MLL gene to the 3' half of the AFF1 gene. This rearrangement
is associated with acute lymphocytic leukemia and other leukemia types.;
NCIt note : The presence of this fusion gene is associated with a very poor prognosis.;