| ALDH1 | Aldehyde dehydrogenase 1 |
| cfDNA | Circulating free DNA |
| CSC | Cancer Stem Cells |
| CTC | Circulating Tumor Cells |
| EMT | Epithelial-to-Mesenchymal Transition |
| ER | Estrogen Receptor |
| EpCAM | Epithelial Cell Adhesion Molecule |
| EGFR | Epidermal Growth Factor Receptor |
| HER2 | Human epidermal growth factor receptor 2 |
| MBC | Metastatic Breast Cancer |
| NGS | Next Generation Sequencing |
| OS | Overall Survival |
| PgR | Progesteron Receptor |
| PIK3 | Phosphatidylinositol 3-kinase |
| PIK3CA | Catalytic subunit of PIK3 |
| PFS | Progression Free Survival |
| SCS | Single Cell Sequencing |
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