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| Variable | Number | % |
|---|---|---|
| Tumor size | ||
| T3 | 72 | 20.0 |
| T4 | 288 | 80.0 |
| Nodal status | ||
| N1 | 36 | 10.0 |
| N2 | 214 | 59.4 |
| N3 | 110 | 30.6 |
| Pathologic type | ||
| Well differentiated | 144 | 40.0 |
| Moderately differentiated | 180 | 50.0 |
| Undifferentiated | 36 | 10.0 |
| Mucinous | ||
| No | 282 | 78.3 |
| Yes | 78 | 21.7 |
| Vascular invasion | ||
| No | 284 | 78.9 |
| Yes | 76 | 21.1 |
| Perineural invasion | ||
| No | 250 | 69.4 |
| Yes | 110 | 30.6 |
| KRAS mutational status | ||
| Wild | 220 | 61.1 |
| Mutant | 140 | 38.9 |
