Nodal spread and micrometastasis within mesorectum

Table 1 Diameter distribution of examined lymph nodes.

	<0.5 mm	<1 mm	<2 mm	<5 mm	<10 mm	≥10 mm	Sum
Uninvolved LN	165	138	245	270	26	0	844
Involved LN	5	7	23	69	32	12	148
Sum	170	145	268	339	58	12	992
Percent (%)	17.1	14.6	27.0	34.2	5.8	1.2	100

Table 2 Mesorectal distribution of tumor involved lymph nodes for 10 stage III patients.

Primary tumor location	Involved lymph node
	Left region	Right region	Rear region	Outer layer
Left	13	1	31	18
Right	5	21	27	22
Others	10	15	25	11

Table 3 Logistic regression analysis of CMI with clinicopathologic characteristics.

	Rectal cancer (n = 31)		CMI (n = 12)		Sig.	Exp (B)
	No. of patients	Percent (%)	No. of patients	Percent (%)
Age (yr)
<40	3	9.68	3	25.00
4059	12	38.71	5	41.67	0.069	0.908
≥60	16	51.61	4	33.33
Primary tumor location
Lower	9	29.03	4	33.33
Middle	17	54.84	6	50.00	0.828	0.858
Upper	5	16.13	2	16.67
Differentiation
Poor	11	35.48	8	66.67
Moderate	18	58.06	3	25.00	0.564	0.587
Well	2	6.45	1	8.33
Infiltration
T1	2	6.45	1	8.33
T2	6	19.35	0	0.00	0.654	1.517
T3	21	67.74	9	75.00
T4	2	6.45	2	16.67
Involved LN
0	15	48.39	3	25.00
19	11	35.48	5	41.67	0.242	1.082
≥10	5	16.13	4	33.33

Table 4 Lymph node micrometastasis with clinicopathologic characteristics.

	Micrometastasis		P
	Yes	No
T
1	1	1
2	1	5	0.11
3	5	16
4	2	0
N
0	2	11
1	1	5	0.124
2	6	6
TNM stage
1	1	6
2	1	5	0.267
3	6	11
4	1	0
Differentiation
Well	0	2
Moderate	3	15	0.06
Poor	6	5