| Surveillance | Chemotherapy | Total |
---|---|---|---|
 | (n=36) | (n=4) | (n=40) |
Disease relapsed (n) | 9 (25.0%) | 0 (0%) | 9 (22.5%) |
Site | Â | ||
  Retroperitoneum | 8 (88.9%) | ||
  Mediastinum | 1 (11.1%) | ||
  Lung | 1 (11.1%) | ||
Time to relapse (months) | 2–13 (mean 6) |  |  |
Treatment at relapse (n) | Â | Â | Â |
  Chemotherapy | 9 | ||
  Surgery | 5 |  |  |
Prognosis | Â | Â | Â |
  Cause-specific death | 0 | 0 | 0 |
  Death of other causes | 1 | 1 | 2 |