Table 1. Outcome of ESD procedures by size.
| All lesions | Lesion size20 mm – 49 mm | Lesion size50 mm – 140 mm | P value(by size) | |
| All procedures | (n = 182) | (n = 131) | (n = 51) | |
| Lesion size, mean (± SD) | 41.0 mm(± 17.4) | 32.5 mm(± 7.4) | 61.4 mm(± 12.5) | ./. |
| Localization | ||||
| Cecum | 43 (23.6 %) | 30 (22.9 %) | 13 (25.5 %) | n.s. |
| Right-sided colon | 65 (35.7 %) | 51 (38.9 %) | 14 (27.5 %) | n.s. |
| Left-sided colon | 11 (6.0 %) | 9 (6.9 %) | 2 (3.9 %) | n.s. |
| Rectum | 63 (34.6 %) | 41 (31.3 %) | 22 (43.1 %) | n.s. |
| Procedures | ||||
| Procedure time, mean (± SD) | 127.5 min (± 99.8) | 92.7 min(± 62.4) | 217.0 min(± 120.9) | P < 0.001 |
| Conversion to EPMR or surgery | 27 (14.8 %) | 18 (13.7 %) | 9 (17.6 %) | n.s. |
| Complications | 21 (11.5 %) | 12 (9.2 %) | 9 (17.6 %) | n.s. |
| Perforation | 17 (9.3 %) | 11 (8.4 %) | 6 (11.8 %) | n.s. |
| Delayed bleeding | 5 (2.7 %) | 2 (1.5 %) | 3 (5.9 %) | n.s. |
| Histology | ||||
| Carcinoma | 13 (7.1 %) | 10 (7.6 %) | 3 (5.9 %) | n.s. |
| HG-IEN | 48 (26.4 %) | 29 (22.1 %) | 19 (37.2 %) | P < 0.05 |
| LG-IEN | 101 (55.5 %) | 77 (58.8 %) | 24 (47.1 %) | n.s. |
| SSA | 20 (11.0 %) | 15 (11.5 %) | 5 (9.8 %) | n.s. |
| Completed procedures only | (n = 155) | (n = 113) | (n = 42) | |
| En bloc resection | 137 (88.4 %) | 101 (89.4 %) | 36 (85.7 %) | n.s. |
| R0 resection | 97 (62.6 %) | 80 (70.8 %) | 17 (40.5 %) | P < 0.001 |
HG-IEN, high-grade intraepithelial neoplasia; LG-IEN, low-grade intraepithelial neoplasia; SSA, sessile serrated adenoma.