title: [Clinicopathological features and prognosis of postirradiation osteosarcoma in nasopharyngeal carcinoma].
abstract: OBJECTIVE
  Post irradiation osteosarcoma (PIOS) in patients with nasopharyngeal carcinoma (NPC) is rare and a potential late complication of radiation. We investigate its clinicopathological features and prognosis.
  
  
  METHODS
  426 cases of bone sarcomas in Cancer Center of Sun Yat-sen University, China between 1964 and 2003 were reviewed retrospectively. Fifteen patients were determined to have PIOS after radiation of NPC. Its prevalence rate, onset time, site, image features, and treatment were described. Kaplan-Meier analysis was used to determine the relative prognostic factors.
  
  
  RESULTS
  In 12 patients undertaken radical surgery, one patient had residual tumor and six patients presented tumor recurrence five to 19 months (mean of nine months) after surgery. All patients survived seven to 41 months with a mean of 18 months. The one-year and two-year survival rates were 60% and 24% respectively. Female patients with large area of tumor bone formation in images had better survival than male patients without or few tumor bone formation. Age, radiation dosage, onset time of PIOS, tumor size, and treatment were probably not significant factors to prognosis.
  
  
  CONCLUSIONS
  PIOS in patients with NPC is a high malignant disease and often has poor prognosis. Surgery with pre-and post-operative chemotherapy might be a way to improve its survival.
authors.affiliation: Department of Combined Therapy No. 3, Cancer Center of Sun Yat-Sen University, Guangzhou 510060, China. drliuwei@163.com
authors.forename: Wei-wei
authors.initials: WW
authors.lastname: Liu
authors.forename: Zhi-hua
authors.initials: ZH
authors.lastname: Chen
authors.forename: Qiu-liang
authors.initials: QL
authors.lastname: Wu
authors.forename: Guo-hao
authors.initials: GH
authors.lastname: Wu
authors.forename: Zong-yuan
authors.initials: ZY
authors.lastname: Zeng
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001859:Bone Neoplasms / Q000175:diagnosis / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009303:Nasopharyngeal Neoplasms / Q000473:pathology / Q000532:radiotherapy*; D009381:Neoplasms, Radiation-Induced / Q000175:diagnosis / Q000473:pathology*; D012516:Osteosarcoma / Q000175:diagnosis / Q000473:pathology*; D011379:Prognosis; D012189:Retrospective Studies; D055815:Young Adult