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Patients with brain metastases at CyberKnife radiosurgery had a median overall survival of 13 months per Kaplan-Meier curves for each total tumor volume quartile of 0-0.5 ccs (95% CI: 10-21), 0.6-1.5 ccs (95% CI: 11-21) and 1.6-4.0 ccs (95% CI: 11-20), while a total tumor volume quartile of 4.1-28.5 ccs had a median overall survival of 10 months (95% CI: 9-23).
CI = confidence interval
