Table 1.
Tumor characteristics of primary peritoneal cancer and epithelial ovarian cancer cases
| Primary peritoneal cancer | Ovarian cancer | p-value | ||||
|---|---|---|---|---|---|---|
| All cases | (n = 78) | (n = 1107) | ||||
| Tumor behavior | Low malignant potential | 4 | (5.1%) | 227 | (20.5%) | 0.001 |
| Invasive | 72 | (92.3%) | 877 | (79.2%) | ||
| Missing | 2 | 3 | ||||
| Invasive cases | (n = 72) | (n = 877) | ||||
| Histology | Serous | 62 | (86.1%) | 495 | (56.4%) | <0.0001 |
| Clear cell | 3 | (4.2%) | 87 | (9.9%) | ||
| Endometrioid | 139 | (15.8%) | ||||
| Mucinous | 48 | (5.5%) | ||||
| Other | 7 | 7(9.7%) | 108 | (12.3%) | ||
| Invasive serous cases | (n = 62) | (n = 495) | ||||
| Stage | I or II | 2 | (3.2%) | 70 | (14.1%) | 0.017 |
| III or IV | 59 | (95.2%) | 422 | (85.3%) | ||
| Missing | 1 | 3 | ||||
| Grade | Well-differentiated | 1 | (1.6%) | 45 | (9.1%) | 0.027 |
| Moderately differentiated | 30 | (48.4%) | 168 | (33.9%) | ||
| Poorly or undifferentiated | 30 | (48.4%) | 267 | (53.9%) | ||
| Missing | 1 | 15 | ||||