| AIs | Aromatase Inhibitors |
| BC | Breast Cancer |
| CDK4/6 | Cyclin-Dependent Kinase 4/6 |
| CDKs | Cyclin-Dependent Kinases |
| ER | Estrogen Receptor |
| ER+ | Estrogen-Receptor Positive |
| ERE | Estrogen Responsive Element |
| FDA | Food and Drug Administration |
| HER2 | Human Epidermal Growth Factor Receptor 2 |
| HPNE | Human Pancreatic Nestin-Expressing ductal |
| INK4 | INhibitor of CDK4 |
| KIP | CDK-Kinase Inhibitory Protein |
| MMP | Matrix-Metallo-Proteinase |
| mTOR | Mammalian Target Of Rapamycin |
| PI3K | PhosphatidylInositol 3-Kinase |
| PR | Progesterone Receptor |
| SERD | Selective ER Down-regulators |
| SERM | Selective ER Modulators |
| SMI | Small Molecule Inhibitor |
| TN | Triple Negative |
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