title: Hemangiopericytoma: a 20-year single-institution experience.
abstract: BACKGROUND
  Hemangiopericytoma is an uncommon soft tissue sarcoma. We sought to evaluate the long-term outcome of a consecutively treated patient cohort with hemangiopericytoma.
  
  
  METHODS
  The study involved 36 adult patients (older than 16 years) with hemangiopericytoma treated at The University of Texas M. D. Anderson Cancer Center between July 1975 and July 1995. Data on clinicopathologic parameters, surgical treatment, adjuvant therapy, disease recurrence, and survival were obtained from a review of medical records.
  
  
  RESULTS
  The median follow-up was 57 months. Twenty-eight patients (78%) underwent complete and potentially curative resection of their primary disease. Of the nine patients (32%) who had local recurrences, four (57%) had epidural tumors and three (43%) had retroperitoneal tumors, but none had extremity tumors. Extremity tumors were associated with a significantly prolonged local recurrence-free survival compared to tumors at nonextremity anatomic sites (P <.05). Ten patients had recurrences at distant sites. Of the 13 patients who experienced any form of disease recurrence, four had recurrences after a disease-free interval of more than 5 years. The 5-year actuarial survival rate for the entire group of 36 patients was 71%. Noncurative surgical treatment (P=.007) and development of distant metastatic disease (P=.013) were associated with shortened survival.
  
  
  CONCLUSIONS
  Extended survival is common in hemangiopericytoma patients treated with curative intent. However, local and distant recurrences may occur after a prolonged disease-free interval, emphasizing the need for long-term follow-up. Retroperitoneal and meningeal tumors were associated with higher local recurrence rates; therefore, adjuvant therapies should be considered and evaluated for tumors at these sites.
authors.affiliation: Department of Surgical Oncology, The University of Texas M.D. Anderson Cancer Center, Houston 77030, USA.
authors.forename: F R
authors.initials: FR
authors.lastname: Spitz
authors.forename: M
authors.initials: M
authors.lastname: Bouvet
authors.forename: P W
authors.initials: PW
authors.lastname: Pisters
authors.forename: R E
authors.initials: RE
authors.lastname: Pollock
authors.forename: B W
authors.initials: BW
authors.lastname: Feig
mesh_terms: D000328:Adult; D000368:Aged; D017024:Chemotherapy, Adjuvant; D015331:Cohort Studies; D005260:Female; D006393:Hemangiopericytoma / Q000401:mortality / Q000556:secondary / Q000601:surgery / Q000628:therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D018714:Radiotherapy, Adjuvant; D015996:Survival Rate; D017211:Treatment Failure