title: Infant acute lymphoblastic leukemia with t(11;16)(q23;p13.3) and lineage switch into acute monoblastic leukemia.
abstract: Rearrangements of the mixed-lineage leukemia (MLL) gene have been associated with a poor prognosis in infant acute lymphoblastic leukemia (ALL). Previously, MLL translocations involving the CREP-binding protein (CREBBP) gene at chromosome band 16p13.3 have primarily been reported in treatment-related acute myeloid leukemia, after chemotherapy for other primary malignancies using topoisomerase II inhibitors. We report a case of de novo infant ALL with t(11;16)(q23;p13.3). After chemotherapy, this patient developed an acute monoblastic leukemia (M5b) with retention of the t(11;16)(q23;p13.3), indicating that this is a lineage switch of the original leukemic clone. To our knowledge, these findings have not been previously reported.
authors.affiliation: Department of Pathology and Laboratory Medicine, The University of Kansas Hospital, 3901 Rainbow Boulevard, Kansas City, KS 66100, USA. cstasik@kumc.edu
authors.forename: Christopher
authors.initials: C
authors.lastname: Stasik
authors.forename: Siddhartha
authors.initials: S
authors.lastname: Ganguly
authors.forename: Mark T
authors.initials: MT
authors.lastname: Cunningham
authors.forename: Stacey
authors.initials: S
authors.lastname: Hagemeister
authors.forename: Diane L
authors.initials: DL
authors.lastname: Persons
mesh_terms: D001854:Bone Marrow Cells / Q000473:pathology; D019070:Cell Lineage; D002880:Chromosomes, Human, Pair 11 / Q000235:genetics*; D002885:Chromosomes, Human, Pair 16 / Q000235:genetics*; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007223:Infant; D007621:Karyotyping; D007948:Leukemia, Monocytic, Acute / Q000235:genetics* / Q000473:pathology; D008297:Male; D008677:Metaphase; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000235:genetics* / Q000473:pathology; D014178:Translocation, Genetic / Q000235:genetics*