Table 2.

Univariate analysis of median overall survival time following GKRS by clinical characteristics.

Clinical characteristics	Median survival (months)	p-Value
ECOG 0 or 1 vs. ≥2	17.0 vs. 1.8	0.0001
Controlled vs. uncontrolled extracranial disease	17.4 vs. 4.6	0.0001
RPA Stage I vs. RPA ≥II	18.2 vs. 6.2	0.0007
Multiple GKRS sessions vs. one GKRS session	31.0 vs. 7.0	0.002
Prior metastasectomy vs. no prior metastasectomy	Median not reached vs. 7.1	0.012
Prior chemotherapy vs. no prior chemotherapy	15.3 vs. 5.2	0.021
Less than 4 metastases vs. ≥4 metastases	15.2 vs. 6.6	0.051
Breast cancer vs. all other histologies	20.4 vs. 8.9	0.08
Commercial insurance or Medicare vs. Medicaid or uninsured	13.7 vs. 6.8	0.08
Female vs. male	15.4 vs. 7.0	0.10
Caucasian vs. non-Caucasian	13.7 vs. 10.1	0.89

GKRS, Gamma Knife^® Radiosurgery.