title: The prognostic significance of Ki-67 labeling indices for oligodendrogliomas.
abstract: OBJECTIVE
  The prognostic significance of quantitative measurement of tumor proliferative activity was evaluated for oligodendroglial tumors.
  
  
  METHODS
  Ki-67/MIB-1 immunochemistry was used to measure proliferative activity in 81 oligodendrogliomas and oligoastrocytomas. The relationship among survival, proliferation, histological features, and clinical variables were evaluated using a Cox proportional hazards analysis.
  
  
  RESULTS
  After stratifying by histological grade and adjusting for age at diagnosis, there was a significant association between the Ki-67/MIB-1 labeling index (LI) (percentage of positive cells) and survival (P = 0.04). This association was illustrated further by the significantly different survival of two groups based on LI ranges of less than or equal to 5 and greater than 5 (P < 0.0001).
  
  
  CONCLUSIONS
  The poor correlation between mitotic figures and survival in oligodendrogliomas that has been reported previously emphasizes the need for an accurate method to measure proliferative activity. Our study demonstrated the usefulness of the Ki-67/MIB-1 LI and demonstrated that LI ranges can be defined for clinical application.
authors.affiliation: Division of Neuropathology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA.
authors.forename: S W
authors.initials: SW
authors.lastname: Coons
authors.forename: P C
authors.initials: PC
authors.lastname: Johnson
authors.forename: D K
authors.initials: DK
authors.lastname: Pearl
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000032:analysis*; D001921:Brain / Q000473:pathology; D001932:Brain Neoplasms / Q000401:mortality / Q000473:pathology*; D002455:Cell Division / Q000502:physiology*; D005260:Female; D005910:Glioma / Q000401:mortality / Q000473:pathology*; D006801:Humans; D007124:Immunoenzyme Techniques; D019394:Ki-67 Antigen / Q000032:analysis*; D008297:Male; D008875:Middle Aged; D009837:Oligodendroglioma / Q000401:mortality / Q000473:pathology*; D011379:Prognosis; D016019:Survival Analysis
chemical_list: D014408:Biomarkers, Tumor; D019394:Ki-67 Antigen