Histology of resected specimen
| ESD | EMR | p Value | |
|---|---|---|---|
| Patients with successful ESD or EMR | 20 | 20 | |
| No dysplasia | 1 | 3 | 0.61 |
| Low-grade intraepithelial neoplasia | 2 | 0 | 0.49 |
| High-grade intraepithelial neoplasia | 0 | 2 | 0.49 |
| Adenocarcinoma | 17 | 15 | 0.69 |
| Grading | |||
| G1 | 2 | 5 | 0.41 |
| G2 | 11 | 8 | 0.53 |
| G3 | 4 | 2 | 0.66 |
| Deepest vertical invasion | |||
| Mucosa | 10 | 12 | 0.75 |
| Submucosa, upper third (sm1) | 6 | 2 | 0.24 |
| Submucosa, middle third (sm2) | 1 | 1 | 1.00 |
| Infiltration of lymphatic (L1) or venous vessels (V1) | 0 | 0 | |
| Complete resection of HGIN or AC (R0) | 10/17 | 2/17 | 0.01 |
| Curative resection of HGIN or AC with vertical invasion limited | |||
| To the mucosa | 6/17 | 2/17 | 0.22 |
| To the mucosa or submucosa (sm1) with low-risk factors | 9/17 | 2/17 | 0.03 |
| Incomplete resection of HGIN or AC (R1) | 7/17 | 15/17 | 0.01 |
| At horizontal margins (R1 HM+R0 VM) | 4 | 14 | 0.0036 |
| At vertical margins (R1 VM+R0 HM) | 1 | 0 | 1.00 |
| At vertical and horizontal margins (R1 VM+R1 HM) | 2 | 1 | 1.00 |
EMR, endoscopic mucosal resection; ESD, endoscopic submucosal dissection; HM, horizontal tumour margins; VM, vertical tumour margins.