| IHC | Immunohistochemistry |
| ISH | In situ hybridization |
| pCR | Pathological complete response |
| NACT | Neoadjuvant chemotherapy |
| cHER2+ | HER2-positive based on pathology report |
| Her2MtGx | HER2 MetaGene assay |
| Estimated probability | |
| SE | Standard error |
| PPV | Positive predictive value |
| NPV | Negative predictive value |
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