TABLE 4.
Clinicopathological features and outcomes of the BA‐ESD and C‐ESD groups with tumor ≥40 mm in diameter
| Variables | BA‐ESD (n = 21) | C‐ESD (n = 17) | p‐value |
|---|---|---|---|
| Age (year, mean ± SD) | 64 ± 15 | 70 ± 11 | 0.25 |
| Sex, male (%) | 16 (76) | 11 (65) | 0.44 |
| BMI (kg/m2, mean ± SD) | 24 ± 3 | 22 ± 2 | 0.06 |
| History of abdominal surgery (%) | 3 (14) | 4 (24) | 0.46 |
| Tumor location (%) | 0.30 | ||
| Cecum | 6 (29) | 5 (29) | |
| Ascending colon | 10 (48) | 11 (65) | |
| Transverse colon | 5 (24) | 1 (6) | |
| Tumor size (mm, mean ± SD) | 47 ± 14 | 47 ± 11 | 0.97 |
| Growth type (%) | 0.13 | ||
| LST‐G | 10 (48) | 13 (76) | |
| LST‐NG | 6 (29) | 1 (6) | |
| Polypoid | 5 (24) | 3 (18) | |
| Preoperative scope operability (%) | 0.21 | ||
| Good | 0 (0) | 0 (0) | |
| Fair | 9 (43) | 4 (24) | |
| Poor | 12 (57) | 13 (76) | |
| Colonoscope (%) | 0.13 | ||
| PCF‐H290TI | 15 (71) | 8 (47) | |
| PCF‐Q260AZI | 6 (29) | 9 (53) | |
| Submucosal fibrosis (%) | 0.95 | ||
| None/mild | 15 (71) | 12 (71) | |
| Severe | 6 (29) | 5 (29) | |
| Histology (%) | 0.95 | ||
| Adenoma | 8 (38) | 7 (41) | |
| Tis carcinoma | 8 (38) | 5 (29) | |
| T1a carcinoma | 1 (5) | 1 (6) | |
| T1b carcinoma | 4 (19) | 4 (24) | |
| Procedure time (min, mean ± SD) | 112 ± 73 | 119 ± 79 | 0.85 |
| Dissection speed (mm2/min, mean ± SD) | 20 ± 10 | 21 ± 12 | 0.72 |
| Intraoperative scope operability (%) | 0.53 | ||
| Good | 5 (24) | 4 (24) | |
| Fair | 0 (0) | 1 (6) | |
| Poor | 16 (76) | 12 (71) | |
| Use of snaring (%) | 2 (10) | 0 (0) | 0.19 |
| En bloc resection (%) | 19 (90) | 16 (94) | 0.68 |
| R0 resection (%) | 18 (86) | 16 (94) | 0.40 |
| Adverse event (%) | |||
| Intraoperative perforation | 0 (0) | 4 (24) | 0.0188 |
| Delayed perforation | 0 (0) | 0 (0) | ‐ |
| Postoperative bleeding | 2 (10) | 1 (6) | 0.68 |
Abbreviations: BA‐ESD, balloon‐assisted ESD; BMI, body mass index; C‐ESD, conventional ESD; ESD, endoscopic submucosal dissection; LST‐G, laterally spreading tumor granular type; LST‐NG, laterally spreading tumor non‐granular type; SD, standard deviation.