Table 3 Multivariate analysis of disease specific survival

 < 65

Reference group

 ≥ 65

1.2

0.8–1.6

0.327

 Soft tissue of extremity

Reference group

 Soft tissue of axial

0.8

0.5 to 1.2

0.253

 Internal tissue/organ

1.0

0.6 to 1.6

0.964

 Performed

Reference group

 Not performed

7.6

3.5 to 16.7

< 0.001

Size

–

–

–

Stage

–

–

–

Radiotherapy

–

–

–

Size*stage

–

–

–

Size*radiotherapy

–

–

–