| ADC | antibody–drug conjugate |
| BC | breast cancer |
| BM | brain metastases |
| CDK-I | CDK inhibitor |
| EGFR | epidermal growth factor |
| ER | estrogen receptor |
| GnRH | gonadotropin hormone analogues |
| ICI | immune checkpoint inhibitors |
| LHRH | luteinizing hormone−releasing hormone |
| LVEF | Left ventricular ejection fraction |
| PD | pharmacodynamic |
| PF | pulmonary fibrosis |
| PK | pharmacokinetic |
| RT | radiation therapy |
| SBRT | stereotactic body RT |
| SERD | selective estrogen receptor degradants |
| SERM | selective estrogen receptor modulators |
| T-DM1 | Trastuzumab emtansine |
| TKI | tyrosine kinase inhibitor |
| WBRT | whole-brain RT |
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