Research Article
Early Esophageal Cancer Specific Survival Is Unaffected by Anatomical Location of Tumor: A Population-Based Study
Table 1
General characteristics of patients based on location of tumor.
| | Characteristic | Total | Upper | Middle | Lower | value |
| | Total | 1330 (100%) | 54 (4.1%) | 176 (13.2%) | 1100 (82.7%) | |
| | Mean ± SE age (year) | | | | | 0.43 |
| | Sex (% males) | 1104 (83.0%) | 32 (59.3%) | 130 (73.9%) | 942 (85.6%) | <0.01 |
| | Race (% Whites) | 1246 (93.7%) | 45 (83.3%) | 149 (84.7%) | 1052 (95.6%) | <0.01 |
| | Histology | | | | | | | Squamous cell carcinoma | 158 (11.9%) | 22 (40.7%) | 72 (40.9%) | 64 (5.8%) | <0.01 | | Adenocarcinoma | 1011 (76.0%) | 26 (48.1%) | 89 (50.6%) | 896 (81.5%) | | Others | 161 (12.1%) | 6 (11.1%) | 15 (8.5%) | 140 (12.7%) |
| | Tumor stage | | | | | | | Stage Tis | 270 (20.3%) | 17 (31.5%) | 40 (22.7%) | 213 (19.4%) | 0.07 | | Stage T1a | 1060 (79.8%) | 37 (68.5%) | 136 (77.3%) | 887 (80.0%) |
| | Tumor grade | | | | | | | Well-differentiated | 169 (12.7%) | 9 (16.7%) | 21 (11.9%) | 139 (12.6%) | 0.17 | | Moderately differentiated | 363 (27.3%) | 8 (14.8%) | 49 (27.8%) | 306 (27.8%) | | Poorly differentiated | 175 (13.2%) | 10 (18.5%) | 31 (17.6%) | 134 (12.2%) | | Anaplastic | 16 (1.2%) | 1 (1.9%) | 0 (0%) | 15 (1.4%) | | Unknown | 607 (45.6%) | 26 (48.1%) | 75 (42.6%) | 506 (46.0%) |
| | Tumor size | | | | | | | No mass (0 mm) | 1 (0.1%) | 0 (0%) | 0 (0%) | 1 (0.2%) | 0.48 | | Microscopic focus only (1 mm) | 58 (8.5%) | 5 (17.2%) | 5 (5.0%) | 48 (8.7%) | | 2 mm–990+ mm (up to 997 mm) | 622 (90.9%) | 24 (82.8%) | 96 (95.0%) | 502 (90.6%) | | Entire circumference (998 mm) | 3 (0.4%) | 0 (0%) | 0 (0%) | 3 (0.5%) |
| | Treatment modality | | | | | | | Endoscopic treatment | 411 (30.9%) | 25 (46.3%) | 65 (36.9%) | 321 (29.2%) | <0.01 | | Esophagectomy | 919 (69.1%) | 29 (53.7%) | 111 (63.1%) | 779 (70.8%) |
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