Table 2. Cox proportional hazards analysis for treatment effects on survival.

Treatment	n	Median survival (d)	Hazard ratios	Hazard ratios, stratified by radiation treatment
PBS	11	14.0 (11.7–16.3)	—	—
PBS+2 Gy	11	14.0 (9.7–18.3)	0.97 (0.42–2.24)	—
VNP pRZ	8	16.0 (12.3–19.7)	0.63 (0.24–1.65)	0.58 (0.22–1.55)
VNP pRZ+2 Gy	6	18.0 (11.2–24.8)	0.53 (0.18–1.54)	0.58 (0.20–1.74)
VNP pRT	11	22.0 (14.6–29.4)	0.41 (0.16–1.04)	0.38 (0.15–1.00)
VNP pRT+2 Gy	8	26.0 (14.9–37.1)	0.21 (0.07–0.63)*	0.24 (0.08–0.75)*

Median survival times and hazard ratios are listed with their 95% confidence intervals in parentheses.

^*Significance is indicated as P<0.05.