Tumour diagnosis and treatment characteristics at colorectal cancer diagnosis
| Tumour diagnosis/treatment | Colon cancer, n=4244 | Rectal cancer, n=1255 | Total, n=5499 |
| Reason leading to diagnosis, n (%) | |||
| Population screening | 136 (3.2) | 37 (2.9) | 173 (3.1) |
| High risk | 39 (0.9) | 16 (1.3) | 55 (1.0) |
| Symptoms | 3421 (80.6) | 1083 (86.3) | 4504 (81.9) |
| Fortuitous discovery | 434 (10.2) | 72 (5.7) | 506 (9.2) |
| Others | 18 (0.4) | 6 (0.5) | 24 (0.4) |
| Missing | 196 (4.6) | 41 (3.3) | 237 (4.3) |
| Abdominal emergency, n (%) | |||
| No | 2466 (58.1) | 976 (77.8) | 3442 (62.6) |
| Yes | 763 (18.0) | 63 (5.0) | 826 (15.0) |
| Missing | 1015 (23.9) | 216 (17.2) | 1231 (22.4) |
| Imaging use for diagnosis, n (%) | |||
| PET scan | 16 (0.4) | 4 (0.3) | 20 (0.4) |
| CT scan/MRI | 780 (18.4) | 250 (19.9) | 1030 (18.7) |
| Others | 443 (10.4) | 113 (9.0) | 556 (10.1) |
| Stage, n (%) | |||
| I | 657 (15.5) | 213 (17.0) | 870 (15.8) |
| II | 1262 (29.7) | 275 (21.9) | 1537 (28.0) |
| III | 950 (22.4) | 436 (34.7) | 1385 (25.2) |
| IV | 976 (23.0) | 205 (16.3) | 1182 (21.5) |
| Missing | 399 (9.4) | 126 (10.0) | 525 (9.5) |
| Differentiation, n (%) | |||
| Well differentiated | 792 (18.7) | 243 (19.4) | 1035 (18.8) |
| Moderately differentiated | 2264 (53.3) | 681 (54.3) | 2945 (53.6) |
| Poorly differentiated | 563 (13.2) | 111 (8.9) | 674 (12.2) |
| Missing | 625 (14.7) | 220 (17.5) | 845 (15.4) |
| Blood vessels invasion, n (%) | |||
| No | 2132 (50.2) | 430 (34.3) | 2562 (46.6) |
| Yes | 886 (20.9) | 186 (14.8) | 1072 (19.5) |
| Missing | 1226 (28.9) | 639 (50.9) | 1865 (33.9) |
| Lymph node invasion, n (%) | |||
| No | 2159 (50.9) | 459 (36.6) | 2618 (47.6) |
| Yes | 612 (14.4) | 89 (7.1) | 701 (12.7) |
| Missing | 1473 (34.7) | 707 (56.3) | 2180 (39.6) |
| Surgery, n (%) | |||
| No | 521 (12.3) | 207 (16.5) | 728 (13.2) |
| Yes | 3698 (87.1) | 1040 (82.9) | 4738 (86.2) |
| Missing | 25 (0.6) | 8 (0.6) | 33 (0.6) |
| Chemotherapy, n (%) | |||
| No | 3146 (74.1) | 694 (55.3) | 3840 (69.8) |
| Yes | 934 (22.0) | 518 (41.3) | 1452 (26.4) |
| Missing | 164 (3.9) | 43 (3.4) | 207 (3.8) |
| Radiotherapy, n (%) | |||
| No | 4131 (97.3) | 629 (50.1) | 4760 (88.6) |
| Yes | 97 (2.3) | 597 (47.6) | 694 (12.6) |
| Missing | 16 (0.4) | 29 (2.3) | 45 (0.8) |
PET, positron emission tomography.