| AR | Androgen response |
| ATxR | Abemaciclib + tamoxifen resistant |
| CDK4/6 | Cyclin-dependent kinase 4 and 6 |
| CDK4/6i | CDK4/6 inhibitor |
| ET | Endocrine therapy (tamoxifen, fulvestrant) |
| GEM+ | Geminin positive |
| HER2 | Human epidermal growth factor receptor 2 negative |
| HR+ | Hormone receptor positive |
| PTxR | Palbociclib + tamoxifen resistant |
| Tamoxifen | 4-hydroxytamoxifen; 4-OH-tamoxifen |
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