| ctDNA | Circulating tumor deoxyribonucleic acid |
| CDK4/6 | Cyclin-dependent kinases 4 and 6 |
| DNA | Deoxyribonucleic acid |
| ESR1 | Estrogen receptor 1 |
| HER2 | Human epidermal growth factor receptor 2 |
| HR | Hormone receptor |
| MBC | Metastatic breast cancer |
| MTD | Maximum tolerated dose |
| OS | Overall survival |
| PFS | Progression-free survival |
| PIK3 | Phosphoinositide 3 kinase |
| RB1 | Retinoblastoma 1 |
| TNBC | Triple-negative breast cancer |
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