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Grading of immunohistopositivity according to Barresi et al. 2008.
| Intensity distribution (ID) score = IS × ASP | 0-12 |
|---|---|
| Immunostaining intensity (IS) | |
| Negative | 0 |
| Weak | 1 |
| Moderate | 2 |
| Strong | 3 |
| Area of staining positivity (ASP) | |
| <5% | 0 |
| 5–25% | 1 |
| 26–50% | 2 |
| 51–75% | 3 |
| 76–100% | 4 |
