Table 2.
Clinical characteristics of the 21 inconclusive cases
| Tumor-related factors | No. of inconclusive cases (%) | P value | |
| Macroscopic type | < 0.0001 | ||
| I | (n = 9) | 9 (100) | |
| IIa | (n = 51) | 7 (13.7) | |
| IIc | (n = 92) | 5 (5.4) | |
| Location | 0.03 | ||
| Upper | (n = 45) | 3 (6.7) | |
| Middle | (n = 69) | 8 (11.6) | |
| Lower | (n = 39) | 10 (25.6) | |
| Histology | 0.16 | ||
| Differentiated | (n = 118) | 19 (16.1) | |
| Undifferentiated | (n = 35) | 2 (5.7) | |
| Ulcer scar | 0.37 | ||
| Positive | (n = 29) | 2 (6.9) | |
| Negative | (n = 124) | 19 (15.3) | |
| Criteria for ER | 0.58 | ||
| Absolute | (n = 51) | 9 (17.6) | |
| Expanded | (n = 38) | 5 (13.2) | |
| Non-indication | (n = 64) | 7 (10.3) | |
ER: Endoscopic resection.