Table 1.

Patient and Tumor Characteristics

		N=270	%
Gender	Male	127	47
	Female	143	53
Primary Cancer	Non-small cell lung cancer	99	36.7
	Breast cancer	63	23.3
	Melanoma	56	20.7
	Other	52	19.3
ECOG PS	0	137	50.9
	1	109	40.5
	2 or 3	23	8.6
	Missing	1	-
Active Systemic Disease	No	140	52
	Yes	129	48
	Missing	1	-
Extracranial Metastatic Sites	No	133	49.4
	Yes	136	50.6
	Missing	1	-
Previous WBRT	No	185	68.5
	Yes	85	31.5
CTX During SRS (<30 Days)	No	213	79.2
	Yes	56	20.8
	Missing	1	-
Intact and Resected Metastases	Intact	406	85.5
	Resected	86	14.5
Number of Metastases Treated at First Session	1	160	59.3
	2	61	22.6
	≥3	49	18.1
	Median if ≥3 (Range)	4 (3-7)
Age (years)	18-44	53	19.6
	45-54	68	25.2
	55-59	48	17.8
	≥60	101	37.4
	Median (Range)	56 (18-87)	-
Total Volume from First Session (cm^3)	0-<0.3	45	17.6
	0.3-<1.3	56	21.9
	1.3-<3.3	54	21.1
	3.3-<7.6	50	19.5
	≥7.6	51	19.9
	Mean (SD)	4.02 (4.76)
	Median (Range)	2.21 (0.032-22.3)
Number of Metastases Treated at First Session	Mean (SD)	1.78 (1.27)
	Median (Range)	1 (1-7)

PS = Performance Status, WBRT = Whole Brain Radiation Therapy, CTX = Chemotherapy, SRS = Stereotactic Radiosurgery, SD = Standard Deviation