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Distribution of HER2 expression by IHC according to tumor phenotype in the HER2-low cohort.
| HER2 expression n (%) | |||
|---|---|---|---|
| 1+ | 2+ | p | |
| Primary breast cancer n (%) | |||
| HR-positive/HER2-negative | 118 (63.1) | 41 (21.9) | 0.493 |
| Triple-negative | 19 (10.2) | 9 (4.8) | |
| Total | 137 (73.3) | 50 (26.7) | |
| Recurrent breast cancer n (%) | |||
| HR-positive/HER2-negative | 122 (59.8) | 40 (19.6) | 0.840 |
| Triple-negative | 33 (16.2) | 9 (4.4) | |
| Total | 155 (76.0) | 49 (24.0) | |
