Table 2.
Characteristics of the endometrial cancer cases identified in the Nurses’ Health Study II (1989–2017)
| Endometrial cancer cases (n = 864) n (%) |
|
|---|---|
| Age at diagnosis (median [range]) | 59.0 [39.0–69.0] |
| Types of epithelial carcinoma | |
| Endometrioid carcinoma—type I, % | 614 (93.7) |
| Non-endometrioid carcinoma—type II, % | 41 (6.3) |
| (Missing type, n = 209) | |
| Histological subtype | |
| Adenocarcinoma‚ endometrioid type | 614 (94.6) |
| Serous cell carcinoma | 13 (2.0) |
| Clear cell carcinoma | 6 (0.9) |
| Squamous cell carcinoma | 1 (0.1) |
| Adenosquamous cell carcinoma (mucoepidermoid) | 1 (0.1) |
| Endometrial carcinosarcoma | 6 (0.9) |
| Mixed carcinoma | 8 (1.2) |
| (Missing subtype, n = 215) | |
| Differentiation/grade in endometrioid type | |
| Well differentiated/G1 | 389 (63.8) |
| Moderately differentiated/G2 | 161 (26.4) |
| Poorly differentiated/G3 | 60 (9.8) |
| (Missing grade, n = 254) | |
| Invasiveness | |
| Non-invasive carcinoma | 129 (33.5) |
| Invasive carcinoma | 256 (66.5) |
| (Missing invasiveness, n = 479) |
Percentages were calculated among the total of cases with available pathology data
Values of polytomous variables may not sum to 100% due to rounding