| Subtypes of breast cancer | Classification index |
| Luminal A | ER and/or PR positive |
| HER2 negative | |
| Ki-67 < 14% | |
| Luminal B (HER2 negative) | ER and/or PR positive |
| HER2 negative | |
| Ki-67 ≥ 14% | |
| Luminal B (HER2 positive) | ER and/or PR positive |
| HER2 overexpressed or amplified | |
| Any Ki-67 | |
| HER2-enriched | ER and PR absent |
| HER2 overexpressed or amplified | |
| Basal-like | ER and PR absent |
| HER2 negative |