Evaluation of the staining achieved by the organising centre and participants who are known to have validated their immunohistochemical assay by published clinical studies
| Low expressor (X) | Medium expressor (Y) | High expressor (Z) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lab‡ | Quick score | % nuclei positive | Result* | Quick score | % nuclei positive | Result* | Quick score | % nuclei positive | Result* | Cut off used* |
| *The result using participants' own threshold value. | ||||||||||
| †H score ∼ cut off value of 50. | ||||||||||
| ‡In order to preserve anonymity, the laboratories have been coded by letters. | ||||||||||
| ¶Results of the initial testing conducted by the UK NEQAS-ICC organising laboratory. | ||||||||||
| a | 3 | >10 | + | 3 | >10 | + | 6 | >10 | + | 20% |
| b | 2 | >10 | + | 5 | >10 | + | 6 | >10 | + | H score† |
| c | 2 | >10 | − | 7 | >10 | + | 6 | >10 | + | 15% |
| d | 0 | 0 | − | 3 | >10 | + | 6 | >10 | + | 10% |
| e | 2 | >10 | + | 5 | >10 | + | 6 | >10 | + | 2% |
| f | 2 | >1 | + | 5 | >10 | + | 6 | >10 | + | 5% |
| g¶ | 3 | >10 | + | 5 | >10 | + | 6 | >10 | + | 10% |