From: Gamma knife radiosurgery for elderly patients with brain metastases: evaluation of scoring systems that predict survival
Prognostic factors
Multivariate analysis
HR
95% CI
Pvalue
Male
ND
0.679
≥75 yrs
0.200
KPS≤80
0.223
Non-lung origin
0.073
Presence of extracranial metastasis
0.646
Low SIR score (<4)
0.282
Low GPA score (<2)
1.756
1.252-2.456
0.001