| ER | estrogen receptor |
| FFPE | formalin-fixed paraffin-embedded |
| HER2 | human epidermal growth factor receptor 2 |
| HR | hormone receptor |
| IHC | immunohistochemistry |
| LVI | lymphovascular invasion |
| MGA | multi-gene expression assays |
| PR | progesterone receptor |
| RFI | recurrence-free interval |
| ROC | receiver operating characteristic |
| RT-PCR | reverse transcriptase-polymerase chain reaction |
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