Table 5.

Cox proportional hazards model

	Univariate regression
	HR (95 % CI)	p value
Demographic factors
Age (per year)	1.02 (0.98–1.06)	0.291
Year of surgery	1.00 (0.92–1.09)	0.966
Male	1.82 (0.72–4.64)	0.208
Presentation
Synchronous presentation	0.51 (0.07–3.82)	0.509
Interval from nephrectomy	1.01 (0.95–1.07)	0.738
Previous metastatectomy	1.80 (0.64–5.07)	0.269
Asymptomatic	1.35 (0.54–3.36)	0.523
Pathological factors
Multifocal pancreatic disease	0.85 (0.33–2.15)	0.727
Tumor size	1.06 (0.85–1.32)	0.602
Positive surgical margin	2.07 (0.67–6.41)	0.205
LN involvement	6.62 (0.77–56.72)	0.085
Vascular invasion	5.15 (1.64–16.13)	0.005*