Evidence
In the largest published series, the recurrence rate was 24% and occurred after a median of 24 months.4 Eighty-nine percent of those patients had local relapse and 84% of relapses had not been previously irradiated. RT appears to confer a protective effect on relapse with only 8% of relapses occurring after RT, however this impact of RT on EFS did not correlate with OS due to the good response of these tumors to salvage therapy.