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The page below is a sample from the LabCE course Breast Cancer Predictive Markers. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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DAB (brown) chromogen localized to cell membrane in HER2 stain using clone CB11. Counterstain is hematoxylin.

Staining Patterns

Each antibody used with IHC has a specific target and staining pattern. The specific location where the precipitation of the chromogen (colored end product) occurs is frequently referred to as its localization or staining pattern. The staining pattern and intensity of reaction are assessed within the context of the tissue morphology, which is examined and evaluated microscopically only by a qualified pathologist. Both estrogen receptor (ER) and progesterone receptor (PR) are localized within the nucleus. HER2 antibody is localized within the cell membrane and is described as a membranous stain.