Case | Sex | Site | Size (cm) | Pendunc- ulated | Polypoid cancer | Margin not cancer-free | Grade III | Lymph invasion | Venous invasion | High risk | OP | Adverse outcome (*follow up) | Comment |
1 | M | Sigmoid | >3 | No | No | Yes | No | No | No | Yes | No | *Local recurrence | Follow up unremarkable |
2 | F | Rectum | 1–2 | No | No | Yes | No | No | No | Yes | No | *Local recurrence + metastasis | MP death |
3 | F | Rectum | < 1 | No | No | Yes | No | No | No | Yes | Yes | Residual carcinoma | |
4 | M | Rectum | 2–3 | No | No | Yes | No | No | No | Yes | Yes | Residual carcinoma | |
5 | M | Sigmoid | 2–3 | No | No | Yes | No | No | No | Yes | Yes | Residual carcinoma + *local recurrence | Postoperative death |
6 | M | Rectum | 1–2 | No | No | Yes | No | No | No | Yes | Yes | Residual carcinoma | |
7 | F | Sigmoid | 2–3 | Yes | No | Yes | No | No | No | Yes | Yes | Residual carcinoma | |
8 | M | Sigmoid | 2–3 | Yes | No | Yes | No | No | No | Yes | Yes | Residual carcinoma | |
9 | M | Sigmoid | 1–2 | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Residual carcinoma | |
10 | M | Sigmoid | 2–3 | No | No | Yes | Yes | No | No | Yes | Yes | Residual carcinoma + *metastasis | MP death |
11 | M | Sigmoid | 2–3 | No | Yes | Yes | No | No | No | Yes | Yes | Residual carcinoma | Postoperative death |
12 | M | Sigmoid | >3 | Yes | No | Yes | No | No | No | Yes | Yes | Residual carcinoma | |
13 | M | Sigmoid | 1–2 | Yes | No | Yes | No | No | No | Yes | Yes | Residual carcinoma + positive lymph node | |
14 | M | Sigmoid | 2–3 | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Positive lymph node | |
15 | M | Rectum | 1–2 | No | No | Yes | No | Yes | No | Yes | Yes | Residual carcinoma | |
16 | M | Sigmoid | 2–3 | Yes | No | Yes | No | Yes | No | Yes | Yes | *Metastasis | MP death |
High risk malignant polyps were when the following items were noted: incomplete polypectomy, not clearly cancer-free margin of resection, angiolymphactic invasion, or grade III carcinoma.
MP death, death due to the malignant polyp; OP, ensuing bowel resection.