Table 1.
Characteristics of participants in the AMBER Consortium by study site
| BWHS | CBCS | WCHS | MEC | ALL AMBER | |
|---|---|---|---|---|---|
| Controls | 2249 | 615 | 834 | 960 | 4658 |
| Cases | 901 | 1408 | 821 | 499 | 3629 |
| ER+ | 498 | 741 | 435 | 294 | 1968 |
| ER− | 233 | 565 | 165 | 130 | 1093 |
| ER unknown | 170 | 102 | 221 | 75 | 568 |
| Age at diagnosis | |||||
| <40 | 47 | 204 | 85 | 0 | 336 |
| 40–49 | 262 | 459 | 215 | 9 | 945 |
| 50–59 | 302 | 381 | 292 | 108 | 1083 |
| 60–69 | 204 | 267 | 173 | 165 | 809 |
| ≥70 | 86 | 97 | 56 | 217 | 456 |
AMBER, African American Breast Cancer Epidemiology and Risk; BWHS, Black Women’s Health Study; CBCS, Carolina Breast Cancer Study; ER, estrogen receptor; MEC, Multi-Ethnic Cohort; WCHS, Women’s Circle of Health Study.