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Concordance of HER2 Status Tested by IHC (PATHWAY HER2/neu 4B5) in Biopsy and Surgical Samples.
| Biopsy Samples | Surgical Samples | NPV (%) | PPV (%) | ||
| IHC 0 to 1+ | IHC 2+ to 3+ | Total | |||
| IHC 0 to 1+ | 60 | 15 | 75 | 80 | - |
| IHC 2+ to 3+ | 6 | 22 | 28 | - | 78.6 |
| Total | 66 | 37 | 103 | ||
| Concordance rate (%) | 90.9 | 59.5 | 80% | ||
IHC, IHC staining performed with PATHWAY HER2/neu (4B5); NPV, negative predictive value; PPV, positive predictive value.
