Table 1.
Descriptive characteristics of first primary male breast cancer cases from the SEER 18 registries, 1988–2012 (N = 5753)
| n | (%) | |
|---|---|---|
| Age at index breast cancer, years | ||
| Mean (SD) | 65.2 | (12.6) |
| Median (interquartile range) | 66 | (56–75) |
| 20–44 | 334 | (5.8) |
| 45–54 | 869 | (15.1) |
| 55–64 | 1447 | (25.2) |
| 65–74 | 1607 | (27.9) |
| 75+ | 1496 | (26.0) |
| Race/ethnicity | ||
| Non-Hispanic White | 4291 | (74.6) |
| Black | 757 | (13.2) |
| Asian/Pacific Islander/Alaska Native | 311 | (5.4) |
| Hispanic | 340 | (5.9) |
| Unknown | 54 | |
| Breast cancer AJCC stage | ||
| I | 1696 | (29.5) |
| II | 2145 | (37.3) |
| III | 951 | (16.5) |
| Missing/unknown | 961 | |
| Hormone receptor status | ||
| ER/PR negative | 213 | (3.7) |
| ER and/or PR positive | 4373 | (76.0) |
| Unknown | 1167 | |
| Tumor size | ||
| <2 cm | 3923 | (68.2) |
| ≥2 cm | 1348 | (23.4) |
| Missing | 482 | |
| Lymph node status | ||
| Negative | 2982 | (51.8) |
| Positive | 2626 | (23.4) |
| Missing | 482 | |
| Surgery | ||
| Surgery performed | 5210 | (90.6) |
| Refused or not recommended | 466 | (8.1) |
| Missing/unknown | 77 | |
| Radiation | ||
| No | 4199 | (73.0) |
| Yes | 1371 | (23.8) |
| Unknown | 183 | |
| Outcome status | ||
| Second primary prostate cancer | 250 | (4.3) |
| Other second primary cancer | 648 | (11.3) |
| Vital status | ||
| Alive | 3312 | (57.6) |
| Died (any cause) | 2441 | (42.4) |
| Cancer-specific death | 1080 | (18.8) |
| Person-years of follow up | ||
| Mean (SD) | 5.6 | (4.9) |
| Median (interquartile range) | 4.3 | (1.8–8.4) |