Table 1.
Characteristics of patients and lesions.
| UEMR | GIEMR | P | |
|---|---|---|---|
| Patients/lesions | 14/14 | 9/10 | 0.661 |
| Male | 10 (71%) | 5 (56%) | |
| Female | 4 (29%) | 4 (44%) | |
| Median age (range, years) | 62 (41–78) |
67 (51–81) |
0.162 |
| Location | 0.643 | ||
| Bulb | 1 (7%) | 2 (20%) | |
| Second portion, preampulla | 5 (36%) | 3 (30%) | |
| Second portion, postampulla | 8 (57%) | 5 (50%) | |
| Morphology | 0.303 | ||
| Sessile type | 1 (7%) | 3 (30%) | |
| Superficial elevated type | 10 (71%) | 6 (60%) | |
| Superficial depressed type | 3 (21%) | 1 (10%) | |
| Median tumor diameter size (range, mm) | 6 (3–12) |
10 (7–18) |
0.00772 |
| Histological type | 0.103 | ||
| Adenoma | 11 (79%) | 5 (50%) | |
| Intramucosal carcinoma | 3 (21%) | 5 (50%) | |
| Operators' experience | 0.161 | ||
| Expert | 14 (100%) | 8 (80%) | |
| Nonexpert | 0 (0%) | 2 (20%) |
1Fisher's exact test. 2Mann–Whitney U test. 3χ2 test. GIEMR: gel immersion endoscopic mucosal resection; UEMR: underwater endoscopic mucosal resection.