Immunoperoxidase staining for estrogen and progesterone receptors in archival formalin fixed, paraffin embedded breast carcinomas after microwave antigen retrieval.

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Abstract
Immunoperoxidase staining was performed for estrogen and progesterone receptors in 93 cases of primary breast carcinoma. Breast tumor samples were fixed in formalin and embedded in paraffin. Antigen retrieval was performed by microwave heating in citrate buffer, pH 6.0, using precisely defined and reproducible conditions. The cases studied included material from the current year and from paraffin blocks retrieved from archival storage dating back to 1981. In all cases, estrogen and progesterone receptor values determined by biochemical assay were available for comparison with the immunohistochemical results. We found 94% agreement of results between the two methods.

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