Table 1.
Clinical characteristics of 608 colorectal ESDs divided into 2 separate groups.
| Group A (20–49 mm) | Group B (≧50) | |
|---|---|---|
| Total ESDs | 511 | 97 |
| Age, y.o., mean ± SD | 67.4 ± 10.3 | 67.1 ± 11.7 |
| Tumor size, mm, mean ± SD | 30.0 ± 7.50 | 64.2 ± 16.0 |
| Tumor location | ||
| Cecum | 67 | 17 |
| Right colon | 254 | 49 |
| Left colon | 169 | 18 |
| Rectum | 88 | 30 |
| Macroscopic type | ||
| LST-G | 205 | 80 |
| LST-NG | 260 | 13 |
| Protruded | 40 | 4 |
| Recurrent | 6 | 0 |
| Histology | ||
| Adenoma | 289 | 43 |
| Mucosal cancer | 120 | 28 |
| SM1 cancer | 39 | 8 |
| SM2 cancer | 20 | 10 |
| Serrated or nonneoplastic lesions | 43 | 2 |
| En bloc resection rate, % | 99.2 | 99.0 |
| Curative resection rate, % | 94.7 | 88.7 |
| Procedure time, min, mean ± SD | 60 ± 35.3 | 119.6 ± 60.0 |
| Complication, no. (%) | ||
| Immediate perforation | 13 (2.5%) | 8 (8.2%) |
| Delayed perforation | 1 (0.2%) | 0 (0%) |
| Bleeding | 6 (1.2%) | 1 (1.0%) |
| Others | 1 (0.2%) |
ESDs: endoscopic submucosal dissections, LST-G: granular -type laterally spreading tumor, SD: standard deviation, SM1: submucosal invasion less than 1000 μm from the muscularis mucosae, and SM2: submucosal invasion 1000 μm or more from the muscularis mucosae.