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Classification of surrogate molecular subtypes of breast cancer.
| Subtype | Receptor status and Ki67 index |
|---|---|
| Luminal A | ER and/or PR positive, HER2 negative, Ki67 ≦ 20% |
| Luminal B | ER and/or PR positive, HER2 negative, Ki67 ≧ 20% |
| ER and/or PR positive, HER2 positive, any Ki67 index | |
| HER2-overexpressed | ER and PR negative, HER2 positive |
| Triple-negative (TNBC) | ER and PR and HER2 negative |
