Table 1: Patient characteristics and univariate analysis for overall  (OS) and event-free survival  (EFS)  ( ).

VariableNo. of patients  (%)5-year OS (%) 5-year EFS  (%)

Sex
 Male
 Female
Age, years
 Median
 Range
  18–25
  26–35
  36+
Primary tumor site
 Extremities
 Pelvis
 Axial
Primary tumor site
 Nonosseous
 Osseous
Tumor size
 <8 cm
 ≥8 cm
Treatment era
 1977–1992
 1993–2007
LC modality
 Surgery
 RT
 S + RT
IE chemotherapy
 No
 Yes
Histopathologic response to chemotherapy
 <95% necrosis
 ≥95% necrosis
Surgical margins
 Clear
 Involved
RT dose  (cGy) (definitive RT only)
 <5600
 ≥5600

Statistically significant.