No. patients | 130 (12.8) | 196 (19.3) | 689 (67.9) | |
Distance from anal verge, median cm | 5.0 | 10.0 | 10.0 | < 0.001¶ |
Tumour size, median cm | 2.7 | 4.5 | 4.0 | < 0.001¶ |
TNM stage‡ |
Stage I | 28 (21.5) | 6 (3.1) | 221 (32.1) | < 0.001 |
Stage II | 37 (28.5) | 62 (31.6) | 150 (21.8) | |
Stage III | 37 (28.5) | 112 (57.1) | 181 (26.3) | |
Stage IV | 13 (10.0) | 13 (6.6) | 86 (12.5) | |
Unable to stage | 15 (11.5) | 3 (1.5) | 51 (7.4) | |
Vascular, lymphatic, neural invasion | 25 (19.2) | 81 (41.3) | 174 (25.3) | < 0.001 |
Histologic grade |
Moderate or poor | 96 (73.8) | 181 (92.3) | 555 (80.6) | < 0.001 |
Positive circumferential radial margin§ | 13 (10.0) | 24 (12.2) | 48 (7.0) | 0.048 |