Molecular rearrangements of the MLL gene at the 11q23 region have been iden
tified in most cases of infant leukemia, regardless of the phenotype. We pr
esent a case of acute myeloid leukemia which coexpressed myeloid and lympho
id markers in a 12-month-old girl. Karyotype analysis revealed the presence
of a thus far unreported translocation t(10;11)(p13;p15). Although no 11q2
3 abnormalities were cytogenetically detectable, an MLL gene molecular rear
rangement was found. (C) Elsevier Science Inc., 1999. All rights reserved.