Table 1.

Pathologic findings according to the size and pattern of lymph node metastasis after cytokeratin staining in pN0 cases on initial examination

	Negative	ITCs				Micro meta-stases	Macro meta-stases	P
		Single cell	Multiple cells	Single cluster	Multiple clusters
WHO (%)								0.019
1W/D, M/D	112 (50.5)	6 (50.0)	0 (0)	1 (20)	6 (42.9)	8 (42.1)	0 (0)
2P/D	54 (24.3)	4 (33.3)	7 (100)	2 (40)	5 (35.7)	8 (42.1)	1 (100)
Mucinous	9 (4.0)	0 (0)	0 (0)	1 (20)	0 (0)	2 (10.5)	0 (0)
3SRC	47 (21.2)	2 (16.7)	0 (0)	1 (20)	3 (21.4)	1 (5.3)	0 (0)
Depth (%)								<0.001
Mucosa	97 (43.7)	4 (33.3)	0 (0)	2 (40)	1 (7.1)	3 (15.8)	0 (0)
4SM	72 (32.4)	2 (16.7)	1 (14.4)	1 (20)	4 (28.7)	5 (26.3)	1 (100)
5PM	21 (9.5)	1 (8.3)	0 (0)	0 (0)	1 (7.1)	2 (10.5)	0 (0)
Subserosa	28 (12.6)	5 (41.7)	3 (42.8)	2 (40)	7 (50)	4 (21.1)	0 (0)
Serosa	4 (1.8)	0 (0)	3 (42.8)	0 (0)	1 (7.1)	5 (26.3)	0 (0)
Total (%)	222 (100)	12 (100)	7 (100)	5 (100)	14 (100)	19 (100)	1 (100)

¹Well and moderately differentiated tubular adenocarcinoma,

²Poorly differentiated tubular adenocarcinoma,

³Signet-ring cell carcinoma,

⁴Submucosa,

⁵Proper muscle.