Table 5.
Polyp characteristics overall and by cancer history
| All patients | No cancer history | Cancer history | ||||
|---|---|---|---|---|---|---|
| Classification | Patients N (%) | Polyps N | Patients N (%) | Polyps N | Patients N (%) | Polyps N |
| All patients | 343 (100) | 179 (100) | 163 (100) | |||
| All polyps | 297 (87) | 882 | 157 (88) | 454 | 139 (85) | 416 |
| Cancer | 1 (0) | 1 | 0 (0) | 0 | 1 (0) | 1 |
| Precancerous polyps | 226 (66) | 479 | 118 (66) | 236 | 107 (66) | 233 |
| Adenoma | 207 (60) | 422 | 110 (61) | 212 | 96 (59) | 201 |
| Multiple (≥3) | 47 (14) | – | 22 (12) | – | 24 (15) | – |
| Tubular | 190 (55) | 376 | 103 (58) | 187 | 86 (53) | 180 |
| Tubulovillous | 3 (1) | 3 | 3 (2) | 3 | 0 (0) | 0 |
| Advanced | 10 (3) | 13 | 7 (4) | 9 | 3 (2) | 4 |
| Serrated polyps | 79 (23) | 100 | 38 (21) | 46 | 40 (25) | 53 |
| Serrated adenoma* | 36 (11) | 43 | 21 (12) | 22 | 15 (9) | 21 |
| Proximal hyperplastic | 49 (14) | 57 | 21 (12) | 24 | 27 (17) | 32 |
| Advanced | 4 (1) | 5 | 3 (2) | 3 | 1 (1) | 2 |
| Distal hyperplastic/Non-neoplastic** | 70 (20) | 402 | 39 (22) | 218 | 31 (19) | 182 |
| No polyps found | 46 (13) | – | 22 (12) | – | 24 (15) | – |
*
Patients with serrated adenomas count both in the adenoma and serrated categories.
**
Patient counts include patients who had polyps, but all identified polyps were free from cancer or precancerous features. The polyp count includes all such polyps even if the patient also had precancerous or cancerous polyps.