title: Multiple chromosomal monosomies are characteristic of giant cell ependymoma.
abstract: Giant cell ependymoma, a rare ependymoma subtype, was recently recognized as a separate diagnostic entity with variations both in malignant potential and course of disease. We analyzed the first supratentorial giant cell ependymoma using G-band karyotyping, DNA ploidy analysis, and array comparative genomic hybridization. The tumor was hypodiploid, and the karyotype showed multiple monosomies. This novel cytogenetic pattern seems specific for giant cell ependymoma as the only previous cytogenetic analysis of a giant cell ependymoma found similar monosomies. We were also able to analyze cytogenetically the subsequent recurrent tumor, phenotypically an anaplastic ependymoma, allowing a first insight into the genetic events involved in disease progression.
authors.affiliation: Section for Cancer Cytogenetics, Institute for Medical Informatics, The Norwegian Radium Hospital, Oslo University Hospital, 0310 Oslo, Norway. h.s.s.dahlback@medisin.uio.no
authors.forename: Hanne-Sofie S
authors.initials: HS
authors.lastname: Dahlback
authors.forename: Petter
authors.initials: P
authors.lastname: Brandal
authors.forename: Bård K
authors.initials: BK
authors.lastname: Krossnes
authors.forename: Radek
authors.initials: R
authors.lastname: Fric
authors.forename: Torstein R
authors.initials: TR
authors.lastname: Meling
authors.forename: Leonardo A
authors.initials: LA
authors.lastname: Meza-Zepeda
authors.forename: Håvard E
authors.initials: HE
authors.lastname: Danielsen
authors.forename: Sverre
authors.initials: S
authors.lastname: Heim
mesh_terms: D000328:Adult; D001932:Brain Neoplasms / Q000235:genetics* / Q000473:pathology / Q000601:surgery; D002871:Chromosome Banding; D055028:Comparative Genomic Hybridization / Q000379:methods*; D018450:Disease Progression; D004806:Ependymoma / Q000235:genetics* / Q000473:pathology / Q000601:surgery; D015726:Giant Cells / Q000473:pathology*; D006801:Humans; D007621:Karyotyping; D008297:Male; D009006:Monosomy / Q000235:genetics*; D009364:Neoplasm Recurrence, Local / Q000235:genetics / Q000473:pathology / Q000601:surgery; D016612:Paraffin Embedding; D010641:Phenotype; D018714:Radiotherapy, Adjuvant; D013702:Temporal Lobe