Table 1. Clinicopathologic characteristics of eligible patients; Surgery & Endoscopic groups.

	Surgery Group	Endoscopy Group
Factors	n = 31	n = 20	P valuec
Gender
Male	16	14	0.1927
Female	15	6
Age
65 ≤	17	12	0.7163
65 >	14	8
Tumor site
Colon	12	15	0.0112
Rectum	19	5
Tumor size
20mm ≤	30	8	0.0185
20mm >	1	12
Histology
tuba	28	6	<0.0001
muca	1	0
papa	1	0
pora	1	0
tubular adenoma	-	14
T factorb
T0	0	14	<0.0001
Tis	0	4
T1	1	2
T2	9	0
T3	20	0
T4	1	0
N factorb
N0	14	0	NAa
N1	14	0
N2	3	0
NA	0	20
M factorb
M0	31	0	NAa
M1	0	0
MA	0	20
pStageb
Tis	0	18	<0.0001
I	8	2
II	6	0
III	17	0
IV	0	0

^a Abbreviations: tub, tubular adenocarcinoma; muc, mucinous adenocarcinoma; pap, papillary adenocarcinoma; por, poorly differentiated adenocarcinoma; pStage, pathological stage; NA, Not Applicable.

^b TNM Classification of Malignant Tumors, 7th Edition.

^c P value was calculated by chi-square test.