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An objective scoring system measuring the extent of staining within the tumour compartment as well as the intensity of staining was used.
| Extent of the staining within tumour cells | |
| <25% | 1+ |
| 25% to 75% | 2+ |
| >75% | 3+ |
| Intensity of staining | |
| Weak | 1+ |
| Moderate | 2+ |
| Strong | 3+ |
