title: Prognostic value of perfusion MR imaging in patients with oligodendroglioma: A survival study.
abstract: OBJECTIVE
  The purpose of this study was to evaluate retrospectively whether cerebral blood volume measurement based on pretreatment perfusion MRI is a prognostic biomarker for survival in patients with oligodendroglioma or mixed oligoastrocytoma.
  
  
  METHODS
  Between 1998 and 2004, 54 patients (23 females and 31 males), aged 21-73 years, with oligodendroglioma (or mixed tumour) were examined prior to beginning treatment with dynamic susceptibility-weighted contrast (DSC) perfusion MRI during gadolinium first-pass. The relative cerebral blood volume (rCBV) was calculated by dividing the measurement within the tumour by the measurement of the normal-appearing contralateral region. Patients were classified in two groups, grade A and grade B, according to the Saint-Anne Hospital classification and followed-up clinically and by means of MRI until their death or for a minimum of 5 years. Patients were also classified in grade II and grade III-IV, according to the World Health Organisation (WHO) classification, and were analysed with the same methods. Age, sex, treatment, tumour grade, contrast agent uptake, and rCBV were tested using survival curves with Kaplan-Meier's method, and their differences were analysed using the log-rank test.
  
  
  RESULTS
  In this population, median survival was 3 years. A rCBV threshold value of 2.2 was validated as a prognostic factor, for survival in these patients with oligodendrogliomas. Age, sex, contrast uptake, and maximum rCBV were found to be prognostic factors in univariate analysis. Multivariate analysis revealed that tumour grade (grade A/grade B), rCBV, age, and sex were prognostic factors independent of the other factors. The tumour grade according to the WHO classification (II versus III-IV) was also detected as an independent prognostic factor.
  
  
  CONCLUSIONS
  Pretreatment rCBV measured by DSC perfusion MRI was found to be a prognostic factor for survival in patients with oligodendroglioma or mixed tumour, by using the Saint-Anne Hospital classification, which separate the IIB from the IIA.
authors.affiliation: Department of Neuroradiology and MRI, CHU de Grenoble, France.
authors.forename: Z
authors.initials: Z
authors.lastname: Jiang
authors.forename: J-F
authors.initials: JF
authors.lastname: Le Bas
authors.forename: S
authors.initials: S
authors.lastname: Grand
authors.forename: C
authors.initials: C
authors.lastname: Salon
authors.forename: C
authors.initials: C
authors.lastname: Pasteris
authors.forename: D
authors.initials: D
authors.lastname: Hoffmann
authors.forename: F
authors.initials: F
authors.lastname: Bing
authors.forename: F
authors.initials: F
authors.lastname: Berger
authors.forename: S
authors.initials: S
authors.lastname: Chabardes
authors.forename: C
authors.initials: C
authors.lastname: Liu
authors.forename: A
authors.initials: A
authors.lastname: Krainik
mesh_terms: D000328:Adult; D000368:Aged; D001810:Blood Volume; D001811:Blood Volume Determination; D001921:Brain / Q000473:pathology / Q000503:physiopathology*; D001932:Brain Neoplasms / Q000401:mortality* / Q000473:pathology / Q000503:physiopathology; D005260:Female; D006801:Humans; D018810:Magnetic Resonance Angiography; D008297:Male; D008875:Middle Aged; D009837:Oligodendroglioma / Q000401:mortality* / Q000473:pathology / Q000503:physiopathology; D011237:Predictive Value of Tests; D011379:Prognosis; D012372:ROC Curve; D012189:Retrospective Studies