title: Loss of heterozygosity on chromosome 10q associated with malignancy and prognosis in astrocytic tumors, and discovery of novel loss regions.
abstract: Certain tumor suppressor genes (TSG) residing on human chromosome 10q are implicated in astrocytic tumors. We thoroughly examined loss of heterozygosity (LOH) on chromosome 10q in astrocytic tumors to determine the extent of deletion and their relation to prognostic variables of patients. We analyzed 63 astrocytic tumors, including 9 diffuse astrocytomas, 36 anaplastic astrocytomas, and 18 glioblastomas. DNAs from tumors and leukocytes were analyzed for LOH at 18 microsatellite loci by polymerase chain reaction using fluorescence-labeled primers. Then correlation between LOH and clinicopathological variables was examined statistically. Twenty-four (66.7%) anaplastic astrocytomas and 15 (83.3%) glioblastomas had at least one LOH on chromosome 10q. However, diffuse astrocytomas exhibited no LOH. Nineteen tumors (10 anaplastic astrocytomas and 9 glioblastomas) were believed to have a total loss of one chromosome 10. Analyses on 20 tumors with interstitial LOH revealed that most of the high LOH regions matched the location of known TSGs, while some novel LOH regions were found preferentially in anaplastic astrocytoma. The median survivals of the total, partial, and no loss groups were 10.1, 14.8, and 46.8 months, respectively, indicating a significant difference in the survivals of these groups (P=0.0289). Thus, analyzing chromosome 10q loss is helpful for diagnosing malignancy in astrocytic tumors and for predicting patients' survival. Our data also suggested that there are novel TSGs for anaplastic astrocytoma at 10q24 and 10q26.
authors.affiliation: Department of Neurological Surgery, Okayama University Graduate School of Medicine and Dentistry, Okayama 700-8558, Japan.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Daido
authors.forename: Soichiro
authors.initials: S
authors.lastname: Takao
authors.forename: Takashi
authors.initials: T
authors.lastname: Tamiya
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Ono
authors.forename: Kinya
authors.initials: K
authors.lastname: Terada
authors.forename: Sachio
authors.initials: S
authors.lastname: Ito
authors.forename: Mamoru
authors.initials: M
authors.lastname: Ouchida
authors.forename: Isao
authors.initials: I
authors.lastname: Date
authors.forename: Takashi
authors.initials: T
authors.lastname: Ohmoto
authors.forename: Kenji
authors.initials: K
authors.lastname: Shimizu
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001254:Astrocytoma / Q000235:genetics*; D001932:Brain Neoplasms / Q000235:genetics*; D002648:Child; D002675:Child, Preschool; D002879:Chromosomes, Human, Pair 10 / Q000235:genetics*; D004273:DNA, Neoplasm / Q000235:genetics; D005260:Female; D016147:Genes, Tumor Suppressor / Q000502:physiology*; D005909:Glioblastoma / Q000235:genetics*; D006801:Humans; D019656:Loss of Heterozygosity; D008297:Male; D018895:Microsatellite Repeats; D008875:Middle Aged; D011379:Prognosis
chemical_list: D004273:DNA, Neoplasm