Table 2. Univariate and multivariate analysis for overall survival (Cox proportional hazards regression model).

	Univariate analysis			Multivariate analysis
Factors	RR	95% CI	P-value	RR	95% CI	P-value
Age (<60/60 ⩽)	0.82	0.58–1.20	0.29	—	—	—
Gender (male/female)	0.96	0.68–1.33	0.81	—	—	—
Histological grade (well/moderately, poorly and mucinous)	1.21	0.86–1.76	0.29	—	—	—
Tumour size (<30 mm/⩾30 mm)	1.93	1.16–3.94	0.009	1.29	0.74–2.70	0.4
Serosal invasion (absent/present)	2.40	1.72–3.38	<0.0001	2.16	1.52–3.12	<0.0001
Lymph node metastasis (absent/present)	2.25	1.58–3.38	<0.0001	1.82	1.26–2.76	0.0012
Lymphatic invasion (absent/present)	2.30	1.64–3.31	<0.0001	—	—	—
Venous invasion (absent/present)	1.43	0.99–2.00	0.055	—	—	—
MCAK mRNA expression (T/N<3/T/N>3)	1.49	1.07–2.07	0.019	1.42	1.01–2.00	0.048

CI=confidence interval; RR=relative risk.