Table 3. Comparing progression-free survival between the groups based on the extent of resection and administration of adjuvant treatment.

	N	Adjuvant Tx	Recur	Median-PFS	5 yr-PFS	p-value*
Group 1 (GTR)	193		16 (8.2%)	NR	95%
Group 2 (NTR with adjuvant Tx)	4	RT: 1, GKS: 3	0	NR	100%	0.405
Group 3 (NTR without adjuvant Tx)	49		14 (28.5%)	7.0 yrs	65%	<0.001
Group 4 (STR with adjuvant Tx)	19	RT: 13, GKS: 6	3 (15.7%)	NR	80%	0.135
Group 5 (STR without adjuvant Tx)	24		14 (58.3%)	3.7 yrs	35%	<0.001

*survival analysis versus Group 1 by Kaplan-Meier, log rank test. GTR, gross total removal; NTR, near total removal; STR, subtotal removal; Tx, treatment; PFS, progression free survival; RT, conventional radiotherapy; GKS, gamma knife radiosurgery; NR, not reached