title: Immunohistochemical examination of proliferative potentials and the expression of cell cycle-related proteins of intracranial chordomas.
abstract: The difference in biological features between recurrent and nonrecurrent intracranial chordomas has not been studied. In this study, proliferative potentials of chordomas were studied with an immunohistochemical staining method, mainly using anti-Ki-67 antibody, MIB-1, which is known to be available for archival paraffin sections, together with immunohistochemical studies on the expression of cell cycle or apoptosis-related proteins, including p53, cyclin D1, and bcl-2 proteins. The correlation among MIB-1 staining indices, the immunoreactivities of these proteins, and clinical courses of intracranial chordomas were analyzed retrospectively, and the statistically significant correlation between MIB-1 staining index (SI) and recurrence has been clarified. The mean MIB-1 SI of recurrent tumors was 10.2%, being shown to be higher than that of nonrecurrent tumors (2.8%). The immunohistochemically positive staining of cell cycle-related protein, especially p53 and cyclin D1 proteins, correlated well with recurrence and high MIB-1 SI. In conclusion, both the examination of proliferative potentials of chordomas using MIB-1 SI and the study of the immunoreactivity of p53 and cyclin D1 proteins are important for their biological and histopathological analyses and the prediction of future recurrence.
authors.affiliation: Department of Neurosurgery, Teikyo University Ichihara Hospital, Ichihara City, Chiba, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Matsuno
authors.forename: T
authors.initials: T
authors.lastname: Sasaki
authors.forename: T
authors.initials: T
authors.lastname: Nagashima
authors.forename: R
authors.initials: R
authors.lastname: Matsuura
authors.forename: H
authors.initials: H
authors.lastname: Tanaka
authors.forename: M
authors.initials: M
authors.lastname: Hirakawa
authors.forename: M
authors.initials: M
authors.lastname: Murakami
authors.forename: T
authors.initials: T
authors.lastname: Kirino
mesh_terms: D000293:Adolescent; D000328:Adult; D034961:Antigens, Nuclear; D015415:Biomarkers / Q000032:analysis; D001932:Brain Neoplasms / Q000378:metabolism*; D002455:Cell Division; D002817:Chordoma / Q000378:metabolism*; D019938:Cyclin D1; D016213:Cyclins / Q000378:metabolism*; D005260:Female; D006657:Histones / Q000378:metabolism; D006801:Humans; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D019394:Ki-67 Antigen / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D009687:Nuclear Proteins / Q000378:metabolism*; D015513:Oncogene Proteins / Q000378:metabolism*; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism; D012189:Retrospective Studies; D012737:Sex Factors; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*
chemical_list: D034961:Antigens, Nuclear; D015415:Biomarkers; D016213:Cyclins; D006657:Histones; D019394:Ki-67 Antigen; D009687:Nuclear Proteins; D015513:Oncogene Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D016159:Tumor Suppressor Protein p53; D019938:Cyclin D1