Table 3 Frequency of six-marker immunohistochemistry-defined subtypesa, overall and by study site in the AMBER consortium
From: Frequency of breast cancer subtypes among African American women in the AMBER consortium
| Â | IHC-based definitiona | Overall n (%) | CBCS n (%) | WCHS n (%) | BWHS n (%) |
|---|---|---|---|---|---|
Luminal A | HR ≥10%, Ki67 <7% | 512 (37) | 233 (32) | 146 (42) | 133 (46) |
Luminal B | HR ≥10%, Ki67 ≥7% | 333 (25) | 212 (29) | 73 (21) | 48 (17) |
ER-/HER2+ | ER <10%, HER2+ | 111 (8) | 52 (7) | 32 (9) | 27 (9) |
Basal-like | HR <10%, HER2-, antigenicity+ | 425 (31) | 247 (33) | 99 (28) | 79 (28) |
Total | Â | 1381 | 744 | 350 | 287 |
Unclassifiedb | Â | 171 | 75 | 57 | 39 |