Table 1.
Clinical and histopathology data of all 221 patients
| Variables | Number of patients | Percent (%) |
|---|---|---|
| Sex | ||
| Male | 160 | 72.4 |
| Female | 61 | 27.6 |
| Age (years) | ||
| ≥ 65 | 100 | 45.2 |
| < 65 | 121 | 54.8 |
| Grade | ||
| Well or moderately differentiated | 51 | 23.1 |
| Poorly differentiated | 170 | 76.9 |
| Location | ||
| Lower | 180 | 81.4 |
| Middle | 13 | 5.9 |
| Upper | 28 | 12.7 |
| T stage | ||
| T1 | 23 | 10.4 |
| T2 | 39 | 17.6 |
| T3 | 98 | 44.3 |
| T4 | 61 | 27.6 |
| N stage | ||
| N0 | 67 | 30.3 |
| N1 | 46 | 20.8 |
| N2 | 34 | 15.4 |
| N3 | 74 | 33.5 |
| TNM stage | ||
| I | 43 | 19.5 |
| II | 63 | 28.5 |
| III | 115 | 52.0 |
| LN | ||
| < 15 | 43 | 19.5 |
| ≥ 15 | 178 | 80.5 |
| LNR | ||
| 0 | 68 | 30.8 |
| 0–0.13 | 47 | 21.3 |
| 0.13–0.4 | 54 | 24.4 |
| > 0.4 | 52 | 23.5 |
The depth of primary tumor invasion (T stage), classification of regional metastasis lymph nodes (N stage), and TNM stage were based on the 7th edition TNM staging system; LN: number of lymph nodes examined; LNR: ratio between the positive lymph nodes and the total number of lymph nodes examined