Table 4.

Multivariate analyses for overall survival

Prognostic factors	β	SE	Wald	P-values	HR	95% CI
Age	−0.569	0.449	1.609	0.205	0.566	0.235–1.364
Gender	0.358	0.549	0.424	0.515	1.430	0.487–4.194
Primary tumor	1.940	0.551	12.389	0.0001	6.958	2.362–20.493
Counts of LM	−0.665	0.539	1.521	0.217	0.514	0.179–1.480
With other metastases	−0.430	0.517	0.689	0.406	0.651	0.236–1.794
Interval time†	−0.303	0.427	0.502	0.479	0.739	0.320–1.706
Prior systemic treatment	0.442	0.548	0.650	0.420	1.556	0.531–4.559

Note:

^†Interval time, time between the first liver metastases and CyberKnife^® treatment.

Abbreviations: LM, liver metastases; HR, hazards ratio; CI, confidence interval; SE, standard error.