Characteristics of the populations
| Factor | Yorkshire | |||
|---|---|---|---|---|
| Petersen | Colon Dukes B | Rectum Dukes B | Dukes C | |
| No (%) | No (%) | No (%) | No (%) | |
| Cancer site | ||||
| Colon | 268 (100.0) | 1086 (66.8) | – | 276 (57.5) |
| Rectosigmoid | – | – | 172 (10.6) | 74 (15.4) |
| Rectal | – | – | 367 (22.6) | 130 (27.1) |
| Sex | ||||
| Male | 143 (53.4) | 541 (49.8) | 332 (61.6) | 275 (42.7) |
| Female | 125 (46.6) | 545 (50.2) | 207 (38.4) | 205 (57.3) |
| Extent of spread beyond muscularis propria | ||||
| <3 mm | 72 (26.9) | 373 (54.0) | 248 (60.9) | 129 (51) |
| 3–5 mm | 110 (41.0) | 115 (16.6) | 69 (17.0) | 40 (15.8) |
| >5 mm | 86 (32.1) | 203 (29.4) | 90 (22.1) | 84 (33.2) |
| Not reported T3 | – | 174 (–) | 71 (–) | 51 (–) |
| Not reported T4 | – | 216 (–) | 59 (–) | 105 (–) |
| Peritoneal involvement | ||||
| Absent | 157 (58.6) | 780 (80.0) | 422 (91.0) | 328 (78.5) |
| Present | 111 (41.5) | 195 (20.0) | 42 (9.0) | 90 (21.5) |
| Not reported | – | 111 (–) | 75 (–) | 62 (–) |
| Venous invasion | ||||
| Not evident | 153 (57.1) | 875 (88.6) | 424 (85.1) | 334 (76.3) |
| Extramural | 91 (34.0) | 113 (11.4) | 74 (14.9) | 104 (23.7) |
| Not reported | – | 98 (–) | 41 (–) | 42 |
| Margin involvement | ||||
| Not involved | 232 (86.6) | 988 (94.6) | 441 (84.6) | 390 (83.7) |
| Present | 8 (3.0) | 56 (5.4) | 80 (15.4) | 76 (16.3) |
| Not reported | – | 42 (–) | 18 (–) | 14 (–) |
| Tumour perforation | ||||
| Absent | 257 (95.9) | 244 (84.1) | 134 (87.0) | 114 (82.6) |
| Present | 11 (4.1) | 46 (15.9) | 20 (13.0) | 24 (17.4) |
| Unknown | – | 796 (–) | 385 (–) | 342 (–) |
| Adjacent organ involvement | ||||
| Absent | 238 (88.8) | 979 (90.2) | 502 (93.1) | 434 (90.4) |
| Present | 30 (11.2) | 107 (9.9) | 37 (6.9) | 46 (9.6) |
| Petersen risk | ||||
| Low | 191 (71.3) | 989 (91.1) | 494 (91.7) | – |
| High | 77 (28.7) | 97 (8.9) | 45 (8.4) | – |
| Mean number of nodes examined | 21.3 | 11.5 | 11.8 | 11.3 |