Table 1 Clinicopathologic factors of 106 patients with 8th AJCC pathologic stage 0 or I esophageal squamous cell carcinoma
Factors | No. of patients (Percentage) |
|---|---|
Age (years) (range: 40–80, mean: 55.36, median: 55) |  |
Current smoker | Â |
 Yes | 23 (21.7%) |
 No | 83 (78.3%) |
Comorbidity (diabetes mellitus, liver cirrhosis, hypertension, esophageal reflux disease, CAD) | Â |
 0 | 51 (48.1%) |
 1 | 55 (51.9%) |
Clinical 8th AJCC stage | Â |
 0 | 10 (9.4%) |
 I | 80 (75.5%) |
 II | 14 (13.2%) |
 III | 2 (1.9%) |
Clinical T stage | Â |
 0 (Tis) | 11 (10.4%) |
 T1 | 79 (74.5%) |
 T2 | 16 a(15.1%) |
Clinical N stage | Â |
 N0 | 97 (91.5%) |
 N1 | 7 (6.6%) |
 N2 | 2 (1.9%) |
Primary tumor location | Â |
 Upper | 21 (19.8%) |
 Middle | 53 (50.0%) |
 Lower | 32 (30.2%) |
Pathological tumor grade | Â |
 0 (Tis) | 13 (12.3%) |
 1 | 8 (7.5%) |
 2 | 78 (73.6%) |
 3 | 7 (6.6%) |
Synchronous head and neck cancer | Â |
 No | 53 (50.0%) |
 Yes | 53 (50.0%) |
Metachronous head and neck cancer | Â |
 No | 87 (82.1%) |
 Yes | 19 (17.9%) |