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Allred scoring system for ER-α and PR with total scores (combined proportion and intensity scores) ranging from 0 to 8
| Proportion score | Positive cells (%) | Intensity | Intensity score |
|---|---|---|---|
| 0 | 0 | None | 0 |
| 1 | < 1 | Weak | 1 |
| 2 | 1–10 | Intermediate | 2 |
| 3 | 10–33 | Strong | 3 |
| 4 | 33–66 | ||
| 5 | ≥ 67 | ||
Total scores ≥ 3 are considered positive if the proportion score is at least 2
