title: Proliferation potential and histological features in neurofibromatosis 2-associated and sporadic meningiomas.
abstract: The authors compared the histological appearance and proliferation potential of 35 meningiomas in patients with neurofibromatosis 2 (NF2) and 30 sporadic meningiomas in age- and gender-matched patients without NF2. The NF2 meningiomas showed more mitotic figures (p < 0.001) and nuclear pleomorphism (p = 0.003) than the sporadic meningiomas; however, the incidence of meningothelial, fibroblastic, and transitional subtypes occurred equally in both groups. The proliferation potential was significantly higher in the 35 meningiomas removed from 23 patients with NF2 than in the 30 sporadic meningiomas removed in the 30 patients without NF2 (mean MIB-1 labeling indices: 2.5 vs. 1.75, p = 0.0147). The higher proliferation potential of the NF2 meningiomas may reflect differences in molecular biology between sporadic and NF2 meningiomas and may be related to an earlier onset, multiplicity, and more aggressive behavior of NF2 tumors.
authors.affiliation: Department of Pathology, University of Helsinki, Finland. jussi.antinheimo@helsinki.fi
authors.forename: J
authors.initials: J
authors.lastname: Antinheimo
authors.forename: H
authors.initials: H
authors.lastname: Haapasalo
authors.forename: M
authors.initials: M
authors.lastname: Haltia
authors.forename: M
authors.initials: M
authors.lastname: Tatagiba
authors.forename: S
authors.initials: S
authors.lastname: Thomas
authors.forename: A
authors.initials: A
authors.lastname: Brandis
authors.forename: M
authors.initials: M
authors.lastname: Sainio
authors.forename: O
authors.initials: O
authors.lastname: Carpen
authors.forename: M
authors.initials: M
authors.lastname: Samii
authors.forename: J
authors.initials: J
authors.lastname: Jääskeläinen
mesh_terms: D000293:Adolescent; D000328:Adult; D034961:Antigens, Nuclear; D001324:Autoantigens / Q000032:analysis; D015415:Biomarkers / Q000032:analysis; D016022:Case-Control Studies; D002455:Cell Division; D002467:Cell Nucleus / Q000648:ultrastructure; D004848:Epithelium / Q000473:pathology; D005260:Female; D005347:Fibroblasts / Q000473:pathology; D006801:Humans; D015994:Incidence; D019394:Ki-67 Antigen / Q000032:analysis; D008297:Male; D008577:Meningeal Neoplasms / Q000473:pathology*; D008578:Meninges / Q000473:pathology; D008579:Meningioma / Q000473:pathology*; D008875:Middle Aged; D008938:Mitosis; D008967:Molecular Biology; D016518:Neurofibromatosis 2 / Q000473:pathology*; D009687:Nuclear Proteins / Q000032:analysis
chemical_list: D034961:Antigens, Nuclear; D001324:Autoantigens; D015415:Biomarkers; D019394:Ki-67 Antigen; D009687:Nuclear Proteins