| A The percentage of positive cells | |||
| 0–5% | 6–49% | 50–75% | >75.0% |
| 0 | 1 | 2 | 3 |
| B The staining intensity score | |||
| Uncolored | Light yellow | Brown | Tan |
| 0 | 1 | 2 | 3 |
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