Table 2.

Multivariate Cox proportional hazards regression models for the outcomes of recurrence and survival

	Recurrence		Survival
	HR (95 % CI)	p value	HR (95 % CI)	p value
Lymphadenectomy	1.16 (0.81, 1.66)	0.4	0.84 (0.61, 1.15)	0.3
Pathological T stage		0.013		0.024
T2	Ref.	–	Ref.	–
T3	1.72 (1.16, 2.55)	0.007	1.56 (1.11, 2.19)	0.010
T4	2.45 (1.12, 5.37)	0.025	1.99 (0.96, 4.10)	0.063
Histology		0.015		0.24
Clear cell	Ref.	–	Ref.
Chromophobe	0.42 (0.23, 0.76)	0.004	0.67 (0.41, 1.08)	–
Papillary	0.76 (0.38, 1.52)	0.4	1.04 (0.59, 1.83)	–
Presentation		0.16		0.003
Incidental	Ref.	–	Ref.	–
Local	1.12 (0.79, 1.58)	–	0.93 (0.68, 1.29)	0.7
Systemic	1.62 (0.99, 2.67)	–	1.93 (1.26, 2.96)	0.003
ASA (III/IV vs. I/II)	1.27 (0.91, 1.76)	0.2	1.59 (1.17, 2.15)	0.003
Sarcomatoid	2.46 (1.47, 4.11)	0.001	2.77 (1.69, 4.56)	<0.0001
Surgery type (partial vs. radical)	1.00 (0.40, 2.53)	0.9	0.42 (0.10, 1.74)	0.2
Lymphadenopathy	1.35 (0.95, 1.91)	0.090	1.19 (0.86, 1.66)	0.3
Tumor size (cm)	1.04 (0.99, 1.10)	0.14	1.02 (0.97, 1.07)	0.4