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Table 1 Prognostic scoring systems (GPA, SIR, BSBM)

From: Gamma knife radiosurgery for elderly patients with brain metastases: evaluation of scoring systems that predict survival

  GPA score SIR score BSBM score
  0 0.5 1 0 1 2 0 1
Age ≥60 51-59 ≤50 ≥60 51-59 ≤50 NA
KPS <70 70-80 90-100 ≤50 60-70 >70 50-70 80-100
Control of primary cancer NA PD PR-SD CR-NED No Yes
Volume of the largest BM (cc) NA >13 5-13 <5 NA
No. of BM >3 2-3 1 ≥3 2 1 NA
EC metastasis (+)   (−) NA (+) (−)
  1. BM; brain metastasis, CR; complete regression, EC; extracranial, KPS; Karnofsky performance status, NA; not available, NED; no evidence of disease, No.; number, PD; progression disease, PR; partial regression, SD; stable disease.