| Variable | n | % |
| Tumour location |
|
|
| Proximal | 40 | 4.6 |
| Middle | 160 | 18.3 |
| Distal | 269 | 30.8 |
| Proximal and middle | 60 | 6.9 |
| Proximal and distal | 5 | 0.6 |
| Middle and distal | 215 | 24.6 |
| 3 thirds | 82 | 9.4 |
| Not informed | 42 | 4.8 |
| Cell differentiation grade |
|
|
| Poorly differentiated | 520 | 59.6 |
| Moderately differentiated | 283 | 32.4 |
| Well differentiated | 39 | 4.5 |
| Not informed | 31 | 3.5 |
| Presence of signet-ring cells |
|
|
| Yes | 349 | 40.0 |
| No | 10 | 1.1 |
| Not informed | 514 | 58.9 |
| Lauren’s classification |
|
|
| Diffuse | 105 | 12.0 |
| Intestinal | 88 | 10.1 |
| Mixed | 10 | 1.1 |
| Not informed | 670 | 76.8 |
| Borrmann’s classification |
|
|
| I | 25 | 2.9 |
| II | 110 | 12.6 |
| III | 256 | 29.3 |
| IV | 154 | 17.6 |
| V | 6 | 0.7 |
| Not informed | 322 | 36.9 |
| Staging (TNM) |
|
|
| 0 | 4 | 0.5 |
| I A | 51 | 5.8 |
| I B | 34 | 3.9 |
| IIA | 50 | 5.7 |
| IIB | 41 | 4.7 |
| IIIA | 43 | 4.9 |
| IIIB | 52 | 6.0 |
| IIIC | 69 | 7.9 |
| IV | 196 | 22.5 |
| Not informed | 333 | 38.1 |
| Total | 873 | 100 |