title: Prognostic factors for deep situated malignant gliomas treated with linac radiosurgery.
abstract: OBJECTIVE
  To study the function of radiosurgery on malignant glioma by analyzing prognostic factors affecting malignant gliomas treated with linac radiosurgery.
  
  
  METHODS
  Fifty-eight patients with deep situated malignant gliomas, aged 7 to 70 years, 28 anaplastic astrocytomas and 30 glioblastomas multiforme were analyzed. The median volume of tumor was 10.67 cm3, and median prescription dose for linac radiosurgery was 20 Gy. Results were analyzed with Kaplan-Meier curve and Cox regression.
  
  
  RESULTS
  In follow-up 44.8 percent tumors (26 patients) decreased in size. Median tumor local control interval was 10 months, 15 months for anaplastic astrocytomas, and 9 months for glioblastoma multiforme. Tumor local control probability was 37.9 percent for 1 year and 10.3 percent for 2 years. Median survival was 22.5 months for anaplastic astrocytoma, 13 months for glioblastoma multiforme, and 15 months for all patients. The survival probability was 79.3 percent at 1 year and 20.6 percent at 2 years. Isocenter numbers and tumor volume were the prognostic factors for tumor control, but conformity index was the prognostic factor for survival by Cox regression analysis. Considering pathology, only isocenter number and target volume significantly affected tumor control interval. Complications appeared in 44.8 percent patients and the median interval of complication onset was 8 months. Symptomatic cerebral edema was observed in 31.0 percent patients.
  
  
  CONCLUSIONS
  Linac radiosurgery can effectively improve tumor local control and prolong survival for deep situated malignant gliomas.
authors.affiliation: Department of Neurosurgery, Qilu Hospital, Shandong University, Jinan 250012. wangyy0618@hotmail.com
authors.forename: Yun-Yan
authors.initials: YY
authors.lastname: Wang
authors.forename: Guo-Kuan
authors.initials: GK
authors.lastname: Yang
authors.forename: Shu-Ying
authors.initials: SY
authors.lastname: Li
authors.forename: Xiu-Feng
authors.initials: XF
authors.lastname: Baol
authors.forename: Cheng-Yuan
authors.initials: CY
authors.lastname: Wu
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001254:Astrocytoma / Q000401:mortality / Q000473:pathology / Q000601:surgery*; D001932:Brain Neoplasms / Q000401:mortality / Q000473:pathology / Q000601:surgery*; D002648:Child; D005260:Female; D005500:Follow-Up Studies; D005909:Glioblastoma / Q000401:mortality / Q000473:pathology / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D011379:Prognosis; D016634:Radiosurgery; D015996:Survival Rate