Risk factors for local recurrence and appropriate surveillance interval after endoscopic resection

Table 1 Univariate analysis of risk factors for local recurrence

Factors	Recurrence	Odds ratio	95%CI	P value
Age
< 60 yr	2/60	1
≥ 60 yr	29/300	3.07	0.73-12.8	0.12
Sex
Male	24/228	1
Female	7/132	0.48	0.21-1.11	0.09
History of CRC
-	31/341	1
+	0/19	0.046	0-50.0	0.38
Diabetes
-	29/338	1
+	2/22	1.07	0.25-4.49	0.92
Growth type
LST-G	8/58	1
LST-NG	9/47	1.395	0.53-3.61	0.49
II a, II c	1/45	0.693	0.34-1.38	0.30
Ip, Is	13/210	0.655	0.42-1.01	0.06
Size
< 2 cm	11/239	1
≥ 2 cm	20/121	3.77	1.80-7.88	< 0.001
Location
Rectum	4/67	1
Colon	27/293	0.626	0.21-1,79	0.38
Resection methods
En bloc	6/297	1
Piecemeal	25/63	23.7	9.72-57.8	< 0.001
No of adenoma
< 3	19/227	1
≥ 3	12/133	1.09	0.53-2.26	0.79
Histology
Low grade adenoma	18/159	1
High grade adenoma	12/163	0.65	0.31-1.36	0.26
T1 carcinoma or deeper	1/38	0.46	0.17-1.27	0.13
Histology villous type
-	25/333	1
+	6/27	2.09	1.10-3.97	0.023

CI: Confidence interval; CRC: Colorectal cancer; LST-G: Laterally spreading tumor granular type; LST-NG: Laterally spreading tumor non granular type; Ip: Pedunculated; Is: Sessile.