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The association of BCS and the number of BM
| Number of BM (n) | HR+/HER2− | HR+/HER2+ | HR−/HER2+ | HR−/HER2− | P-value |
|---|---|---|---|---|---|
| 1–3 | 15 (57.7) | 48 (65.8) | 16 (64.0) | 26 (61.9) | 0.011 |
| 4–9 | 10 (38.5) | 14 (19.2) | 3 (12.0) | 3 (7.1) | |
| ≥10 | 1 (3.8) | 11 (15.1) | 6 (24.0) | 13 (31.0) |
Abbreviations: BCS, breast cancer subtype; BM, brain metastases; HER2, human epidermal growth factor receptor 2; HR, hormone receptor.
