Table 6.

Patient and treatment details of SRS for brain metastases

Variable (N)	N (%)
Gender (799 patients)
Male	354 (44%)
Female	445 (56%)
Median age (range), years	63 (23 – 94)
Median Karnofsky score (range)	80 (30–100)
Previous treatment
Surgery	167 (18%)
External beam radiation	361 (37%)
Radiosurgery	111 (12%)
Chemotherapy	276 (29%)
Other	12 (1%)
None	338 (36%)
Primary tumor site (952 lesions)
Lung	512 (53.8%)
Breast	144 (15.1%)
Melanoma	88 (9.2%)
Renal	48 (5.0%)
Colorectal	40 (4.2%)
Head and neck	30 (3.2%)
Gynecological	15 (2.0%)
Other	75 (7.8%)
Median lesion volume, cc	2.1 (0.1 – 113)
Median lesion size, cm	1.2 (0.1 – 34)
Median number of lesions (range)	1 (1 – 7)
Median number of fractions	1 (1 – 5)
Median dose (range), Gy	22 (2..4 – 45)
Prescription dose range (n = 924)
≤ 18 Gy	223 (24%)
19-20 Gy	174 (19%)
21-22 Gy	187 (20%)
22.5 – 24 Gy	189 (20%)
25 – 30 Gy	132 (14%)
> 30 Gy	18 (2%)