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Semi-quantitative assessment of PDL1 expression by tumor cells or immune cells in CRC.
| Score | Tumor cells | Immune cells |
|---|---|---|
| 0 | <5% | <4 clusters of at least 50 stained immune cells/cm2 or isolated cells |
| 1 | 5–25% | 4 to 5 clusters of at least 50 stained immune cells/cm2 |
| 2 | 26–50% | >5 clusters of at least 50 stained immune cells/cm2 with heterogeneous staining |
| 3 | 51–70% | Diffuse staining |
| 4 | >70% |
