title: FLT3/internal tandem duplication subclones in acute myeloid leukemia differ in their engraftment potential in NOD/SCID mice.
abstract: In this study, we tested if FLT3/internal tandem duplication (ITD) in acute myeloid leukemia (AML) might occur at different hierarchical stages during leukemogenesis. In 56 AML cases, 10 showed FLT3/ITD (single ITD=5; multiple ITD=5). Myeloblasts from seven cases (CD34-selected=4; unselected=3) were transplanted into NOD/SCID mice. Five cases engrafted successfully into 14 mice. Two patients carried single FLT3/ITD subclones, which were maintained during primary and secondary transplantations. In three patients with multiple FLT3/ITD subclones, some subclones persisted or expanded while others diminished upon transplantation. Their different engraftment capabilities in NOD/SCID mice supported the proposition that FLT3/ITD might occur at different stages during leukemogenesis.
authors.affiliation: Division of Hematology, Department of Medicine, University of Hong Kong, Hong Kong.
authors.forename: Alice M S
authors.initials: AM
authors.lastname: Cheung
authors.forename: Howard C H
authors.initials: HC
authors.lastname: Chow
authors.forename: Yok-Lam
authors.initials: YL
authors.lastname: Kwong
authors.forename: Raymond
authors.initials: R
authors.lastname: Liang
authors.forename: Anskar Y H
authors.initials: AY
authors.lastname: Leung
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D017931:DNA Primers; D020440:Gene Duplication; D015470:Leukemia, Myeloid, Acute / Q000235:genetics* / Q000473:pathology; D051379:Mice; D016688:Mice, Inbred NOD; D016513:Mice, SCID; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D051941:fms-Like Tyrosine Kinase 3 / Q000737:chemistry / Q000235:genetics*
chemical_list: D017931:DNA Primers; C497971:Flt3 protein, mouse; D051941:fms-Like Tyrosine Kinase 3