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.