title: Comparing central nervous system (CNS) and extra-CNS hemangiopericytomas in the Surveillance, Epidemiology, and End Results program: analysis of 655 patients and review of current literature.
abstract: BACKGROUND
  Hemangiopericytomas (HPCs) are rare tumors in the central nervous system (CNS) and in extra-CNS sites. The authors of this report used the Surveillance, Epidemiology, and End Results (SEER) Program to study prognostic factors in patients with HPC.
  
  
  METHODS
  The SEER database was analyzed for patients who were diagnosed with HPC tumors from 1973 to 2007. Patients were stratified into CNS and extra-CNS groups. Univariate and multivariate analyses were performed for the overall survival (OS) endpoint using major demographic factors (age, race, and sex) and disease factors (tumor site).
  
  
  RESULTS
  In total, 655 patients with HPC were stratified into a CNS group (n = 199) and an extra-CNS group (n = 456). The patients with extra-CNS HPC were statistically older (mean age, 53 years vs 49 years; P = .008) and were more likely to have larger tumors (median greatest dimension, 7.0 cm vs 5.2 cm; P < .001). Patients who had CNS tumors had better OS and cause-specific survival (CSS) compared with patients who had extra-CNS tumors (P < .001 for both). Negative predictors of OS on multivariate analysis included extra-CNS tumor site (hazard ratio [HR], 1.6; P = .005) and older age (ages 40-59 years: HR, 2.08; P = .032; ages 60-79 years: HR, 3.9; P < .001; aged ≥80 years: HR, 7.7; P < .001).
  
  
  CONCLUSIONS
  The current analysis demonstrated that patients with extra-CNS HPCs had worse OS and CSS than patients with CNS HPCs.
authors.affiliation: Department of Radiation Oncology and Winship Cancer Institute, Emory University, Atlanta, GA 30322, USA. whall4@emory.edu
authors.forename: William A
authors.initials: WA
authors.lastname: Hall
authors.forename: Arif N
authors.initials: AN
authors.lastname: Ali
authors.forename: Norleena
authors.initials: N
authors.lastname: Gullett
authors.forename: Ian
authors.initials: I
authors.lastname: Crocker
authors.forename: Jerome C
authors.initials: JC
authors.lastname: Landry
authors.forename: Hui-Kuo
authors.initials: HK
authors.lastname: Shu
authors.forename: Roshan
authors.initials: R
authors.lastname: Prabhu
authors.forename: Walter
authors.initials: W
authors.lastname: Curran
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016543:Central Nervous System Neoplasms / Q000175:diagnosis*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006393:Hemangiopericytoma / Q000175:diagnosis*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D018426:SEER Program; D016896:Treatment Outcome; D055815:Young Adult