Table 3.

Univariate analysis of prognostic factors for overall and disease-free survival in whole population

Variables	Characteristics	5-year OS (%)	P	5-year DFS (%)	P
Pathological stage (ypTNM)	yp0	96.0	0.003	96.0	< 0.001
	ypI	100		100
	ypII	95.6		72.0
	ypIII	67.0		51.4
Depth of invasion (ypT)	ypT0	96.2	0.207	96.2	0.001
	ypT1-ypT2	95.0		92.3
	ypT3-ypT4	80.9		62.7
No. of metastatic lymph nodes (ypN)	ypN0	96.7	< 0.001	84.9	< 0.001
	ypN1	82.4		59.6
	ypN2	28.6		14.3
No. of lymph nodes harvested	< 12	79.1	0.005	69.9	0.126
	≥ 12	92.0		78.7
Differentiation	Poor/Anaplastic	75.6	0.143	52.4	0.001
	High/Moderate	92.2		67.5
	Unknown	77.7		76.6
	No residual tumor	96.2		96.2
LNR	0	96.7	< 0.001	84.9	< 0.001
	0-0.15	94.7		73.0
	0.15-1	42.9		30.7

LNR: Lymph Node Ratio.