title: Two types of chromosome 1p losses with opposite significance in gliomas.
abstract: Deletion of the short arm of chromosome 1 (1p) is considered a favorable prognostic factor in glial tumors. High-density array-comparative genomic hybridization analysis of 108 gliomas shows two distinct types of 1p deletions. Complete hemizygous losses of 1p, which are tightly associated with 19q loss and oligodendroglial phenotype, and partial 1p deletions mainly observed in astrocytic tumors and not associated with 19q loss. Whereas the first type predicts longer overall and progression-free survival (p < 0.0001), the second type has a pejorative prognostic value. Complete 1p-arm evaluation therefore is required to appreciate the real clinical significance of 1p loss in gliomas.
authors.affiliation: Unité Institut National de la Sante et de la Recherche Médicale (INSERM) U509, Laboratoire Pathologie Moléculaire des Cancers, Institut Curie, Paris, France.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Idbaih
authors.forename: Yannick
authors.initials: Y
authors.lastname: Marie
authors.forename: Gaëlle
authors.initials: G
authors.lastname: Pierron
authors.forename: Caroline
authors.initials: C
authors.lastname: Brennetot
authors.forename: Khê
authors.initials: K
authors.lastname: Hoang-Xuan
authors.forename: Michèle
authors.initials: M
authors.lastname: Kujas
authors.forename: Karima
authors.initials: K
authors.lastname: Mokhtari
authors.forename: Marc
authors.initials: M
authors.lastname: Sanson
authors.forename: Julie
authors.initials: J
authors.lastname: Lejeune
authors.forename: Alain
authors.initials: A
authors.lastname: Aurias
authors.forename: Olivier
authors.initials: O
authors.lastname: Delattre
authors.forename: Jean-Yves
authors.initials: JY
authors.lastname: Delattre
mesh_terms: D000328:Adult; D000368:Aged; D001932:Brain Neoplasms / Q000145:classification / Q000235:genetics*; D002872:Chromosome Deletion; D002878:Chromosomes, Human, Pair 1; D005260:Female; D020869:Gene Expression Profiling; D005910:Glioma / Q000145:classification / Q000235:genetics*; D006801:Humans; D019656:Loss of Heterozygosity; D008297:Male; D008875:Middle Aged