Table 1.
Summary of Western reports of larger series of flat colorectal tumours
| Source | Type of study | No of patients with flat lesions/all pts (%) | No of flat adenomas/all benign tumours (%) | No of flat carcinomas/all carcinomas |
| Wolber and Owen19 | Retrospective | 18/210 (8.6) | 29/340 (8.5) | 2/2 |
| Jaramillo et al6 | Prospective | 55/178 (31.4) | 106/261 (40.7) | 3/12 |
| Fujii et al21 | Prospective | No data; 47/208 (22) with tumours* | 28/68 (41) | 2/7 |
| Rembacken et al22 | Prospective | No data; 225/1000 (22.5) with tumours* | 119/321 (36.7) | 4/31 |
| Lanspa et al20 | Prospective | 18/148 (12) | 66/136 (48.5) | None |
| Saitoh et al23 | Prospective | 48/211 (22.7) | 57/139 (44.4) | 3/57 |
| Kiesslich et al24 | Prospective | No data; 79/100 with tumours* | 5/26 (19.2) | 1/6 |
*Both protruding and flat tumours.