Table 2. Role of adjuvant radiation therapy following surgical resection.

Surgery subgroup		Total	Recurrences (%)	1-y PFS, %	5-y PFS, %	p
All surgeries	S	41	19 (46.3)	79.5	32.9	0.7
	S + RT	42	24 (57.1)	97.4	37
Primary resections	S	31	13 (41.9)	76.5	30.6	0.08
	S + RT	26	11 (42.3)	100	51.3
Subtotal resection	STR	13	8 (61.5)	73.3	20.1	0.036
	STR + RT	22	9 (40.9)	100	62.5
Repeat resections	S	10	6 (60)	72.9	36.5	0.45
	S + RT	16	13 (81.3)	74	23.5

Abbreviations: PFS, progression-free survival; RT, radiation therapy; S, surgery only; S + RT, surgery and adjuvant radiation therapy; STR, subtotal resection.