Table 1: Clinicopathological factors of 530 colorectal ESDs in our institution.

Clinicopathological factors

Tumor size (range) (mm)31.2 (10–130)
LocationColon: 364 (68.7%)
Rectum: 166 (31.3%)
MorphologyProtruding: 102 (19.2%)
Superficial: 428 (80.8%)
Rate of en bloc resection91.1%, 483/530
Procedure time (min) 93.4 (10–420)
Histopathological
diagnosis
Ad: 236 (45.6%)
M: 218 (42.2%)
SM: 63 (12.2%)
Stop of ESD2.5%, 13/530
Postoperative hemorrhage 2.3%, 12/530
Perforation4.1%, 22/530
Local severe peritonitis
without perforation
0.7%, 4/530

Ad: adenoma, M: intramucosal cancer, SM: submucosally invaded cancer.