Immunohistochemical (IHC) staining of the human epidermal growth factor receptor 2 (HER2) is routinely performed on breast cancer cases to guide immunotherapies and help predict the prognosis of breast tumors. We present a label-free virtual HER2 staining method enabled by deep learning as an alternative digital staining method. Our blinded, quantitative analysis based on three board-certified breast pathologists revealed that evaluating HER2 scores based on virtually-stained HER2 whole slide images (WSIs) is as accurate as standard IHC-stained WSIs. This virtual HER2 staining can be extended to other IHC biomarkers to significantly improve disease diagnostics and prognostics.
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