title: Analysis of chromosome 7 in adult and pediatric ependymomas using chromogenic in situ hybridization.
abstract: Few studies have yielded reliable data that distinguish between ependymal neoplasms based on molecular genetic attributes. The present study utilizes chromogenic in situ hybridization (CISH), a relatively recent hybridization technique, to retrospectively examine chromosome 7-copy number in pediatric and adult ependymomas. Of the 27 hybridizations, polysomy of chromosome 7 was detected in 10 out of 15 (66%) adult ependymomas, and in only three out of 12 (25%) pediatric lesions. All myxopapillary ependymomas showed polysomy. The remaining tumors were diploid. The authors conclude that (1) there are distinct genetic subsets of ependymoma, in particular, increases in copy number of chromosome 7 are almost exclusively found in myxopapillary ependymoma, and that (2) CISH is a rapid and sensitive method of stratifying morphological variants of ependymoma and potentially other central nervous system (CNS) tumors. These results encourage further investigations with CISH on a larger scale to determine its merit as an ancillary diagnostic and prognostic tool.
authors.affiliation: Department of Pathology, Children's Hospital National Medical Center, Washington, DC, USA.
authors.forename: Mariarita
authors.initials: M
authors.lastname: Santi
authors.forename: Martha
authors.initials: M
authors.lastname: Quezado
authors.forename: Rubin
authors.initials: R
authors.lastname: Ronchetti
authors.forename: Elisabeth J
authors.initials: EJ
authors.lastname: Rushing
mesh_terms: D000328:Adult; D000367:Age Factors; D001932:Brain Neoplasms / Q000145:classification / Q000235:genetics*; D002648:Child; D002675:Child, Preschool; D002863:Chromogenic Compounds / Q000032:analysis; D002897:Chromosomes, Human, Pair 7 / Q000235:genetics*; D004806:Ependymoma / Q000145:classification / Q000235:genetics*; D006801:Humans; D017403:In Situ Hybridization / Q000379:methods; D015192:Infratentorial Neoplasms / Q000145:classification / Q000235:genetics; D011003:Ploidies; D012189:Retrospective Studies; D013120:Spinal Cord Neoplasms / Q000145:classification / Q000235:genetics*
chemical_list: D002863:Chromogenic Compounds