Table 1 Patient and tumor characteristics
Characteristics | No. of patients (%) |
|---|---|
Age (years) | |
 Range | 53–85 |
 Median | 67 |
Sex | |
 Male | 34 (92) |
 Female | 3 (8) |
Performance status score | |
 0–1 | 34 (92) |
 2–3 | 3 (8) |
History of double cancer | |
 Yes | 16 (43) |
 No | 21 (57) |
History of heart disease | |
 Yes | 9 (24) |
 No | 28 (76) |
Histology | |
 Squamous cell carcinoma | 37 (100) |
Tumor location | |
 Cervical | 1 (3) |
 Upper thoracic | 5 (13) |
 Middle thoracic | 23 (62) |
 Lower thoracic or Esophagogastric junction | 8 (22) |
Tumor length (cm) | |
 Range | 0.8–10 |
 Median | 3 |
Circumference | |
  < 3/4 | 25 (67) |
  ≥ 3/4 | 4 (11) |
 Entire | 4 (11) |
 Unknown | 4 (11) |
Methods of endoscopic resection | |
 EMR | 22 (59) |
 ESD | 15 (41) |
Depth of pathological invasion | |
 Muscularis mucosae | 14 (38) |
 Submucosal layer | 22 (59) |
 Muscularis propria | 1 (3) |
Resection margin | |
 Negative | 10 (27) |
 Positive | 17 (46) |
 Non-assessable | 6 (16) |
 Unknown | 4 (11) |