title: Long-term outcome of oligodendrogliomas.
abstract: BACKGROUND
  Favorable prognostic factors for oligodendroglial tumors include age younger than 40 years, low tumor grade, and extent of resection.
  
  
  OBJECTIVE
  To assess survival time and prognostic factors of 100 patients with oligodendrogliomas diagnosed between 1995 and 2002.
  
  
  METHODS
  The tumors were rated histologically by the WHO classification as low grade (grade II) or anaplastic (grade III). One hundred patients were categorized into three groups: group A: grade II, group B: secondary grade III (low grade with anaplastic transformation during the follow-up), group C: de novo grade III. All patients were symptomatic at presentation and underwent neurosurgical procedure for histologic diagnosis. Follow-up was performed with clinical assessment, brain MRI, and MIBI scintigraphy.
  
  
  RESULTS
  There were 66 men and 34 women (mean age at diagnosis 46.7 years). The most common first symptom was partial epileptic seizure (75%). Fifty-six patients had initial gadolinium enhancement (A: 15.6%; B: 36.8% as grade II, 95% as grade III; C: 90%), generally associated with MIBI hypermetabolism (p < 0.0001). Survival rates at 2, 5, and 10 years were A: 88%, 88%, 85%; B: 79%, 64%, 42%; C: 43%, 16%, 15%.
  
  
  CONCLUSIONS
  Secondary anaplastic oligodendroglioma patients were younger than patients with de novo anaplastic oligodendrogliomas. Histologic confirmation is mandatory because some low grade oligodendrogliomas had gadolinium enhancement on MRI and some anaplastic did not. Survival time was longer for secondary than for de novo anaplastic oligodendrogliomas without difference in the duration of the malignant phase of the disease.
authors.affiliation: Department of Neurology, Hôpital Pasteur, Nice, France. christine.lebrun-frenay@wanadoo.fr
authors.forename: C
authors.initials: C
authors.lastname: Lebrun
authors.forename: D
authors.initials: D
authors.lastname: Fontaine
authors.forename: A
authors.initials: A
authors.lastname: Ramaioli
authors.forename: F
authors.initials: F
authors.lastname: Vandenbos
authors.forename: S
authors.initials: S
authors.lastname: Chanalet
authors.forename: M
authors.initials: M
authors.lastname: Lonjon
authors.forename: J F
authors.initials: JF
authors.lastname: Michiels
authors.forename: V
authors.initials: V
authors.lastname: Bourg
authors.forename: P
authors.initials: P
authors.lastname: Paquis
authors.forename: M
authors.initials: M
authors.lastname: Chatel
authors.forename: M
authors.initials: M
authors.lastname: Frenay
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000008:administration & dosage / Q000627:therapeutic use; D001706:Biopsy; D001932:Brain Neoplasms / Q000150:complications / Q000000981:diagnostic imaging / Q000401:mortality* / Q000473:pathology / Q000628:therapy; D002945:Cisplatin / Q000008:administration & dosage; D003131:Combined Modality Therapy; D016371:Cranial Irradiation; D003399:Craniotomy; D003606:Dacarbazine / Q000008:administration & dosage / Q000031:analogs & derivatives*; D004828:Epilepsies, Partial / Q000209:etiology; D005047:Etoposide / Q000008:administration & dosage; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015993:Life Tables; D008130:Lomustine / Q000008:administration & dosage; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D020360:Neoadjuvant Therapy; D009607:Nitrosourea Compounds / Q000008:administration & dosage; D009837:Oligodendroglioma / Q000150:complications / Q000000981:diagnostic imaging / Q000401:mortality* / Q000473:pathology / Q000628:therapy; D009943:Organophosphorus Compounds / Q000008:administration & dosage; D011344:Procarbazine / Q000008:administration & dosage; D011379:Prognosis; D016016:Proportional Hazards Models; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals; D016019:Survival Analysis; D017256:Technetium Tc 99m Sestamibi; D000077204:Temozolomide; D016896:Treatment Outcome; D014750:Vincristine / Q000008:administration & dosage
chemical_list: D009607:Nitrosourea Compounds; D009943:Organophosphorus Compounds; D019275:Radiopharmaceuticals; D011344:Procarbazine; D014750:Vincristine; D005047:Etoposide; D008130:Lomustine; D003606:Dacarbazine; D017256:Technetium Tc 99m Sestamibi; C054368:fotemustine; D002945:Cisplatin; D000077204:Temozolomide