Treatment group | Number (%) | Low risk | Adverse outcome | High risk | Adverse outcome | Death due to malignant polyp | Treatment mortality |
Polypectomy only (56%) | 39 (100) | 25 (64) | 0 | 14 (36) | 2 (5) | 1 (3) | 0 |
Polypectomy + surgery (44%) | 31 (100) | 7 (23) | 0 | 24 (77) | 14 (45) | 2 (6) | 2 (6) |
Total | 70 (100) | 32 (46) | 0 | 38 (54) | 16 (23) | 3 (4) | 2 (3) |
Percentage is given in brackets; adverse outcome defined as residual cancer in a resection specimen and local or metastatic recurrence during the follow up period.
High risk malignant polyps were when the following items were noted: incomplete polypectomy, not clearly cancer-free margin of resection, angiolymphatic invasion or grade III carcinoma. All others were classified as low risk.