Table 2.

Multivariate Cox′s proportional hazards model analysis of disease-free survival and overall survival.

Variables	Overall survival		Disease-free survival
	HR (95% CI)	P-value	HR (95% CI)	P-value
Tumor size (cm)		0.013*		0.006**
≤4 (ref)	1		1
>4	3.327 (1.284–8.621)		3.241 (1.398–7.509)
LVSI		0.005**		0.003**
Negative (ref)	1		1
Positive	3.807 (1.495–9.695)		3.805 (1.590–9.104)
LNM		0.025*		0.016*
Negative (ref)	1		1
Positive	2.812 (1.136–6.959)		2.764 (1.205–6.340)
PTPRM		0.038*		0.018*
Low (ref)	1		1
High	2.517 (1.091–21.439)		4.403 (1.286–15.075)

HR hazard ratio, CI confidence interval, LNM lymph node metastasis, LVSI lymphovascular space invasion, ref reference.

For the stepwise multivariate analysis, forward LR method was used to select significant variables. Variables entered for multivariate analysis were the following: tumor size, FIGO stage, LNM, LVSI, PTPRM. *P < 0.05, **P < 0.01, ***P < 0.001.