The implication of MLL gene rearrangements in the prognosis of acute myelob
lastic leukemia is an issue of considerable current interest. We report a c
ase of a young man who initially presented with a pancytopenia and went on
50 develop a highly-aggressive acute myeloblastic leukemia. At this time, t
he karyotypic study revealed trisomy 8, a t(9;11) was demonstrated by fluor
escence in situ hybridization (FISH) and the MLL/AF4 rearrangement by rever
se transcriptase-polymerase chain reaction (RT-PCR). (C) 2000 Elsevier Scie
nce Inc. All rights reserved.