From: Is stereotactic radiosurgery a rational treatment option for brain metastases from small cell lung cancer? A retrospective analysis of 70 consecutive patients
Covariate
P value
Hazard ratio (95% CI)
Prior WBRT
< .001
7.11 (2.80–18.0)
Large target volume (>2 mL)
0.085
0.865 (0.193–3.88)
Tumor causing focal deficit
0.97
1.05 (0.104–5.14)
Low marginal dose (<20Gy)
0.024
4.24 (1.21–14.8)