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Histological features of the patients.
| Feature | N = 112 |
| Histotype | |
| N (%) | |
| Small duct type | 82 (73.2) |
| Large duct type | 30 (26.8) |
| Grade | |
| N (%) | |
| G1 | 15 (13.4) |
| G2 | 49 (43.8) |
| G3 | 48 (42.8) |
| T stage [N = 90] | |
| N (%) | |
| T1a | 13 (14.4) |
| T1b | 11 (12.2) |
| T2 | 46 (51.1) |
| T3 | 13 (14.4) |
| T4 | 7 (7.9) |
| Vascular invasion N (%) | 78 (69.6) |
| Perineural invasion N (%) | 50 (44.6) |
| Lymph node metastasis [N = 33] N (%) | 15 (45.5) |
| Resection margin status [N = 90] | |
| N (%) | |
| R0 | 47 (52.2) |
| R1 | 43 (47.8) |
