title: Preoperative prognostic value of dynamic contrast-enhanced MRI-derived contrast transfer coefficient and plasma volume in patients with cerebral gliomas.
abstract: OBJECTIVE
  The prognostic value of dynamic contrast-enhanced MR imaging-derived plasma volume obtained in tumor and the contrast transfer coefficient has not been well-established in patients with gliomas. We determined whether plasma volume and contrast transfer coefficient in tumor correlated with survival in patients with gliomas in addition to other factors such as age, type of surgery, preoperative Karnofsky score, contrast enhancement, and histopathologic grade.
  
  
  METHODS
  This prospective study included 46 patients with a new pathologically confirmed diagnosis of glioma. The contrast transfer coefficient and plasma volume obtained in tumor maps were calculated directly from the signal-intensity curve without T1 measurements, and values were obtained from multiple small ROIs placed within tumors. Survival curve analysis was performed by dichotomizing patients into groups of high and low contrast transfer coefficient and plasma volume. Univariate analysis was performed by using dynamic contrast-enhanced parameters and clinical factors. Factors that were significant on univariate analysis were entered into multivariate analysis.
  
  
  RESULTS
  For all patients with gliomas, survival was worse for groups of patients with high contrast transfer coefficient and plasma volume obtained in tumor (P < .05). In subgroups of high- and low-grade gliomas, survival was worse for groups of patients with high contrast transfer coefficient and plasma volume obtained in tumor (P < .05). Univariate analysis showed that factors associated with lower survival were age older than 50 years, low Karnofsky score, biopsy-only versus resection, marked contrast enhancement versus no/mild enhancement, high contrast transfer coefficient, and high plasma volume obtained in tumor (P < .05). In multivariate analysis, a low Karnofsky score, biopsy versus resection in combination with marked contrast enhancement, and a high contrast transfer coefficient were associated with lower survival rates (P < .05).
  
  
  CONCLUSIONS
  In patients with glioma, those with a high contrast transfer coefficient have lower survival than those with low parameters.
authors.affiliation: From the Departments of Diagnostic Imaging (T.B.N., G.O.C., C.H.T., R.E.T., I.G.C., S.C., J.M.C.) thnguyen@toh.on.ca.
authors.forename: T B
authors.initials: TB
authors.lastname: Nguyen
authors.affiliation: From the Departments of Diagnostic Imaging (T.B.N., G.O.C., C.H.T., R.E.T., I.G.C., S.C., J.M.C.).
authors.forename: G O
authors.initials: GO
authors.lastname: Cron
authors.affiliation: Department of Radiology (J.F.M.), Hôpital de Hull, Gatineau, Québec, Canada.
authors.forename: J F
authors.initials: JF
authors.lastname: Mercier
authors.affiliation: Medical Physics (C.F., I.G.C.).
authors.forename: C
authors.initials: C
authors.lastname: Foottit
authors.affiliation: From the Departments of Diagnostic Imaging (T.B.N., G.O.C., C.H.T., R.E.T., I.G.C., S.C., J.M.C.).
authors.forename: C H
authors.initials: CH
authors.lastname: Torres
authors.affiliation: From the Departments of Diagnostic Imaging (T.B.N., G.O.C., C.H.T., R.E.T., I.G.C., S.C., J.M.C.).
authors.forename: S
authors.initials: S
authors.lastname: Chakraborty
authors.affiliation: Pathology (G.H.J., J.W.).
authors.forename: J
authors.initials: J
authors.lastname: Woulfe
authors.affiliation: Pathology (G.H.J., J.W.).
authors.forename: G H
authors.initials: GH
authors.lastname: Jansen
authors.affiliation: From the Departments of Diagnostic Imaging (T.B.N., G.O.C., C.H.T., R.E.T., I.G.C., S.C., J.M.C.).
authors.forename: J M
authors.initials: JM
authors.lastname: Caudrelier
authors.affiliation: Surgery, Division of Neurosurgery (J.S.).
authors.forename: J
authors.initials: J
authors.lastname: Sinclair
authors.affiliation: Medicine, Division of Neurology (M.J.H.), The Ottawa Hospital, University of Ottawa, Ottawa, Ontario, Canada.
authors.forename: M J
authors.initials: MJ
authors.lastname: Hogan
authors.affiliation: From the Departments of Diagnostic Imaging (T.B.N., G.O.C., C.H.T., R.E.T., I.G.C., S.C., J.M.C.).
authors.forename: R E
authors.initials: RE
authors.lastname: Thornhill
authors.affiliation: From the Departments of Diagnostic Imaging (T.B.N., G.O.C., C.H.T., R.E.T., I.G.C., S.C., J.M.C.) Medical Physics (C.F., I.G.C.).
authors.forename: I G
authors.initials: IG
authors.lastname: Cameron
mesh_terms: D000328:Adult; D000368:Aged; D001932:Brain Neoplasms / Q000401:mortality* / Q000473:pathology*; D003287:Contrast Media; D005260:Female; D005910:Glioma / Q000401:mortality* / Q000473:pathology*; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D011446:Prospective Studies; D016019:Survival Analysis; D015996:Survival Rate
chemical_list: D003287:Contrast Media