title: A case of systemic mastocytosis associated with acute myeloid leukemia terminating as aleukemic mast cell leukemia after allogeneic hematopoietic stem cell transplantation.
abstract: In up to 40% of systemic mastocytosis (SM) cases, an associated clonal hematological non-mast cell lineage disease such as AML is diagnosed before, simultaneously with, or after the diagnosis of SM. A 40-yr-old man was diagnosed with AML with t(8;21)(q22;q22). Mast cells were not noted at diagnosis, but appeared as immature forms at relapse. After allogeneic hematopoietic stem cell transplantation (HSCT), leukemic myeloblasts were not observed; however, neoplastic metachromatic blasts strikingly proliferated during the state of bone marrow aplasia, and finally, aleukemic mast cell leukemia developed. As the disease progressed, we observed serial morphologic changes from immature mast cells with myeloblasts to only metachromatic blasts and atypical mast cells as mast cell leukemia; FISH analysis showed that the neoplastic mast cells originated from the same clone as the leukemic myeloblasts of AML.
authors.affiliation: Department of Laboratory Medicine, University of Ulsan College of Medicine and Asan Medical Center, Seoul, Korea.
authors.forename: Mi Hyun
authors.initials: MH
authors.lastname: Bae
authors.forename: Hyun-Ki
authors.initials: HK
authors.lastname: Kim
authors.forename: Chan-Jeoung
authors.initials: CJ
authors.lastname: Park
authors.forename: Eul-Ju
authors.initials: EJ
authors.lastname: Seo
authors.forename: Sang Hyuk
authors.initials: SH
authors.lastname: Park
authors.forename: Young-Uk
authors.initials: YU
authors.lastname: Cho
authors.forename: Seongsoo
authors.initials: S
authors.lastname: Jang
authors.forename: Hyun-Sook
authors.initials: HS
authors.lastname: Chi
authors.forename: Kyu-Hyung
authors.initials: KH
authors.lastname: Lee
mesh_terms: D000328:Adult; D001854:Bone Marrow Cells / Q000473:pathology; D002891:Chromosomes, Human, Pair 21; D002898:Chromosomes, Human, Pair 8; D018380:Hematopoietic Stem Cell Transplantation; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007946:Leukemia, Mast-Cell / Q000175:diagnosis / Q000209:etiology; D015470:Leukemia, Myeloid, Acute / Q000150:complications / Q000175:diagnosis* / Q000628:therapy; D007963:Leukocytes, Mononuclear / Q000473:pathology; D008297:Male; D034721:Mastocytosis, Systemic / Q000175:diagnosis* / Q000209:etiology; D012008:Recurrence; D014178:Translocation, Genetic; D014184:Transplantation, Homologous
keywords: Acute myeloid leukemia; Aleukemic mast cell leukemia; Allogeneic hematopoietic stem cell transplantation; Systemic mastocytosis