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Semi-quantitative immunohistochemistry of IC ligand expression by tumor cells and immune cells of the stroma in CRC.
| Score | Positive Tumor Cells | Positive Immune Cells of the Stroma |
|---|---|---|
| 0 | <5% | Isolated cells or <4 clusters of stained cells/cm2 |
| 1 | 5–25% | 4–5 clusters of stained cells/cm2 |
| 2 | 26–50% | >5 clusters of stained cells/cm2 |
| 3 | >51% | Diffuse staining of numerous positive cells |
