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• W2164792647 abstract "The benefit of quantifying estrogen receptor (ER) and progesterone receptor (PR) expression in breast cancer is well established. However, in routine breast cancer diagnosis, receptor expression is often quantified in arbitrary scores with high inter- and intraobserver variability. In this study we tested the validity of an image analysis system employing inexpensive, commercially available computer software on a personal computer. In a series of 28 invasive ductal breast cancers, immunohistochemical determinations of ER and PR were performed, along with biochemical analyses on fresh tumor homogenates, by the dextran-coated charcoal technique (DCC) and by enzyme immunoassay (EIA). From each immunohistochemical slide, three representative tumor fields (x20 objective) were captured and digitized with a Macintosh personal computer. Using the tools of Photoshop software, optical density plots of tumor cell nuclei were generated and, after background subtraction, were used as an index of immunostaining intensity. This immunostaining index showed a strong semilogarithmic correlation with biochemical receptor assessments of ER (DCC, r = 0.70, p >0.001; EIA, r = 0.76, p >0.001) and even better of PR (DCC, r = 0.86; p >0.01; EIA, r = 0.80, p >0.001). A strong linear correlation of ER and PR quantification was also seen between DCC and EIA techniques (ER, r = 0.62, p >0.001; PR, r = 0.92, p >0.001). This study demonstrates that a simple, inexpensive, commercially available software program can be accurately applied to the quantification of immunohistochemical hormone receptor studies. (J Histochem Cytochem 45:1559–1565, 1997)" @default.
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• W2164792647 date "1997-11-01" @default.
• W2164792647 modified "2023-10-18" @default.
• W2164792647 title "Application of Photoshop-based Image Analysis to Quantification of Hormone Receptor Expression in Breast Cancer" @default.
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• W2164792647 doi "https://doi.org/10.1177/002215549704501112" @default.
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