Chapter 15 The breasts/Fig 15.21.jpg

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Oestrogen receptor immunohistochemistry in invasive breast carcinoma. Sheets of invasive breast carcinoma cells stained immunohistochemically with antibody against oestrogen receptor. The nuclei of this cancer all show strong reactivity (as intense brown staining) and this tumour is strongly oestrogen-receptor-positive, indicating a good chance of response to hormone therapy.