Table 1.
Characteristics of cancer patients by race
| Risk factors | White (n = 6881) | Black (n = 10 064) |
|---|---|---|
| No. (%)a | 6881 (41%) | 10 064 (59%) |
| Cancers detected, no. (%) | 123 (2%) | 123 (1%) |
| Cancer subtypes, no. (%)b | ||
| ER/PR+HER− | 97 (78%) | 83 (67%) |
| ER/PR+HER+ | 8 (7%) | 12 (10%) |
| ER/PR-HER+ | 7 (6%) | 5 (4%) |
| ER/PR-HER− | 5 (4%) | 19 (15%) |
| Invasive missing | 6 (5%) | 4 (3%) |
| Age, mean (SD), y | 57 (10) | 56 (11) |
| Age category, no. (%), y | ||
| 40-49 | 1897 (28%) | 3173 (32%) |
| 50-59 | 2322 (34%) | 3345 (33%) |
| 60-69 | 1879 (27%) | 2288 (23%) |
| 70+ | 783 (11%) | 1258 (13%) |
| BMI, no. (%), kg/m2c | ||
| <25 | 3146 (46%) | 1372 (14%) |
| 25-29.9 | 1864 (27%) | 2562 (25%) |
| 30+ | 1596 (23%) | 5674 (56%) |
| Missing | 275 (4%) | 456 (5%) |
| Age at menarche, no. (%), y | ||
| <12 | 1164 (17%) | 2122 (21%) |
| 12 to 13 | 3708 (54%) | 4347 (43%) |
| ≥14 | 1524 (22%) | 2234 (22%) |
| Missing | 485 (7%) | 1361 (14%) |
| Age at first birth, no. (%) | ||
| Nulliparous | 2030 (30%) | 1491 (15%) |
| <20 y | 286 (4%) | 3530 (35%) |
| 20-24 y | 1074 (16%) | 2495 (25%) |
| 25-29 y | 1733 (25%) | 1268 (13%) |
| ≥30 y | 1594 (23%) | 647 (6%) |
| Missing | 164 (2%) | 633 (6%) |
| Prior breast biopsy, no. (%) | ||
| None | 4994 (73%) | 8184 (81%) |
| One | 1415 (21%) | 1485 (15%) |
| Two or more | 472 (6%) | 395 (4%) |
| Prior atypical hyperplasia/benign breast findings, no. (%) | 108 (2%) | 26 (0.3%) |
| No. of first-degree relatives with breast cancer, no. (%) | ||
| None | 5456 (79%) | 8768 (87%) |
| One | 1292 (19%) | 1141 (11%) |
| Two or more | 133 (2%) | 155 (2%) |
| BI-RADS density, no.a (%)d | ||
| Almost entirely fatty | 508 (7%) | 1804 (18%) |
| Scattered fibroglandular tissue | 3651 (53%) | 6037 (60%) |
| Heterogeneously dense | 2522 (36%) | 2107 (21%) |
| Extremely dense | 188 (3%) | 91 (1%) |
| Missing | 12 (1%) | 25 (0.2%) |
| Breast area, mean (SD), cm2 | 150 (65) | 207 (82) |
| Percent breast density, mean (SD), % | 18 (12) | 14 (11) |
| Dense breast area, mean (SD), cm2 | 23 (18) | 26 (28) |
a
Percentage of total women in the population.
b
Percentage of total invasive cancers.
c
Body Mass Index.
d
Breast Imaging-Reporting and Data System.