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- W4247999344 abstract "Local oestrogen biosynthesis within the breast can be highly variable, in vitro aromatase activity both in breast cancers and mammary adipose tissue displaying over a 40-fold range between the highest and lowest levels. Evidence is presented to show that: (i) transcriptional activity may influence oestrogen biosynthesis within breast cancers in that both aromatase mRNA and STAT nuclear binding are correlated positively to in vitro aromatase activity; (ii) the local presence of cancer may enhance aromatase activity in particulate fractions and primary fibroblast cultures from mammary adipose tissue; (iii) tumour extracts and breast cyst fluids may induce aromatase in cultured fibroblasts, the active principles responsible for these effects being incompletely defined (although the combination of interleukin (IL)-6 and its soluble receptor dramatically enhances aromatase activity, it is unclear whether this particular cytokine system can account for the stimulatory effects of breast extracts and fluids); (iv) the aromatase activities in both breast cancer and adipose tissues are susceptible to classical aromatase inhibitors such as aminoglutethimide and 4-hydroxyandrostenedione (and to newer inhibitors such as CGS16949 and CGS20267 at low nanomolar concentrations) but reduced sensitivity to 4-hydroxyandrostenedione may be observed in certain breast cancers. These findings may have important implications for the development and progression of hormone-dependent cancers within the breast." @default.
- W4247999344 created "2022-05-12" @default.
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- W4247999344 date "1997-04-01" @default.
- W4247999344 modified "2023-10-16" @default.
- W4247999344 title "Regulation of Aromatase Activity Within the Breast" @default.
- W4247999344 doi "https://doi.org/10.1016/s0960-0760(96)00202-6" @default.
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