Table 2.

Gamma Knife Radiosurgery and Other Treatment Data

Total number GK procedures	188
Total number metastases treated with GK	550
Median number GK treatments per patient	1.0
Median number isocenters at first GK treatment	6.0
Median number metastases treated at first GK	2.0
Median minimum marginal dose (Gy) at first GK	19
Number patients receiving GK with:
1 treatment (number, %)	85 (66)
2 treatments (number, %)	35 (27)
3 treatments (number, %)	5 (4)
4 treatments (number, %)	3 (2)
>4 treatments (number, %)	1 (1)
Patients receiving therapy with:
Chemotherapy, initial (number, %)	52 (40)
Chemotherapy, salvage (number, %)	19 (15)
Biologic agents, initial (number, %)	43 (33)
Biologic agents, salvage (number, %)	15 (12)
WBRT, initial (number, %)	36 (28)
WBRT, salvage (number, %)	25 (19)
GK, boost after WBRT (number, %)	4 (3)
GK, salvage after WBRT (number, %)	32 (25)
Craniotomy, initial (number, %)	40 (31)
Craniotomy, salvage (number, %)	13 (10)

GK, gamma knife radiosurgery; WBRT, whole-brain radiation therapy.