| ABC | Adenosine Triphosphate-binding cassette |
| CK 5/6 | Basal cytokeratins 5/6 |
| CMC | Canine mammary carcinoma |
| CTR | control |
| EGFR1 | Epidermal Growth Factor Receptor type 1 |
| ERα | Estrogen Receptor alpha |
| HER2 | Human Epidermal Growth Factor Receptor type 2 |
| IHC | immunohistochemistry |
| MDR | Multidrug resistance |
| PR | Progesterone Receptor |
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