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Immunohistochemical (IHC) analysis results showing immunostaining grades image with rations 0 to 1+ are negative for HER-2/neu membrane staining and 2+ are equivocal and 3+ are positive for HER-2/neu membrane staining. (A) Score 0, normal by IHC, (B) Score 1+ normal by IHC, (C) Score 2+ equivocal by IHC, (D) Score 3+ abnormal.
