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Cytokines, such as IL-6 and tumor necrosis factor (TNF)-α, have an important role in regulating estrogen synthesis in peripheral tissues, including normal and malignant breast tissues. The activities of the aromatase, estradiol 17β-hydroxysteroid dehydrogenase and estrone sulfatase are all increased by IL-6 and TNF-α. Prostaglandin E2 may also be an important regulator of aromatase activity in breast...
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