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Immunoassay reagents intended to perform qualitative and/or quantitative analyses in tissue preparations to determine the presence of a cellular regulatory protein that binds progesterone hormones (i.e., cytoplasmic progesterone receptors). These receptors are especially found in progesterone-sensitive tissues (e.g., breast, uterus, pituitary gland). The assays are usually performed in surgically removed samples; determination of the level of progesterone receptors is used in the prognosis of the response to endocrine therapy (i.e., it is a marker) in diseases such as breast cancer.
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