Table 2.

Histopathological assessment of tumors in Pn0 and Pn1 groups.

	Total	%	Pn0	%	Pn1	%	Statistics *
Cases	571		40		531
Tumor stage							p = 0.007
pT1 (<2 cm)	68	11.9	12	30	56	10.6
pT2 (2–4 cm)	323	56.6	20	50	299	56.7
pT3 (>4 cm)	156	27.3	8	20	148	28.1
pT4 (vessel infiltration)	24	4.2	0	0	24	4.6
Lymphnode metastasis							p < 0.001
N-	153	26.8	24	60	129	24.3
N+	418	73.2	16	40	401	75.7
Distant metastasis							p = 0.296
M0	510	89.3	38	95	472	88.9
M1	61	10.7	2	5	59	1.1
Histologic grade							p = 0.026
G1	20	3.5	4	10	16	3
G2	348	60.9	27	67.5	321	60.5
G3	203	35.6	9	22.5	194	36.5
Resection margin							p = 0.06
R0	359	62.9	31	77.5	328	61.7
R1	212	37.1	9	22.5	203	38.2
Vascular invasion							p = 0.09
V0	467	81.8	37	92.5	430	81
V1	104	18.2	3	7.5	101	19
Lymphatic invasion							p = 0.001
V0	330	57.8	33	82.5	297	55.9
V1	241	42.2	7	17.5	234	44.1

* Fisher’s exact test for categorical variables and students t-test for continuous variables.