| ESR1 | estrogen receptor gene |
| ER | estrogen receptor alpha |
| ERα36 | estrogen receptor alpha, 36kDa isoform |
| ERα66 | estrogen receptor alpha, 66kDa isoform |
| FISH | fluorescent in situ hybridization |
| HER2 | human epidermal growth factor receptor |
| IHC | immunohistochemistry |
| PR | progesterone receptor alpha |
| OS | overall survial |
| DFS | disease free survival |