| EMT | epithelial–mesenchymal transition |
| MET | mesenchymal-epithelial transition |
| MICs | metastasis-initiating cells |
| SC | Stem Cell |
| HR | Hormone Receptor |
| BCSC | breast cancer stem cells |
| CSCs | Cancer stem cells |
| CTCs | Circulating tumor cells |
| ER | estrogen receptor |
| PR | progesterone receptor |
| HER2 | human epidermal growth factor receptor 2 |
| ALDH1 | aldehyde dehydrogenase 1 |
| HD | Healthy Donors |
| RT-qPCR | Quantitative Reverse Transcription Polymerase Chain Reaction |
| PBMCs | peripheral blood mononuclear cells |
| PBS | phosphate-buffered saline |
| LN | lymph nodes |
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