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Discrepant HER2 FISH and HER2 IIHC Cases
| TMA HER2 FISH | TMA HER2 IHC* | No. Cases | Full-Section HER2 IHC |
|---|---|---|---|
| Positive | Negative | 3 | 3+ |
| Equivocal | 2+ | 2 | 3+ |
| Equivocal | Negative | 1 | 3+ |
IHC scores are based on the ToGA HER2 scoring scheme.
FISH indicates fluorescence in situ hybridization; IHC, immunohistochemistry; TMA, tissue microarray.
