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Dear Astrid
Tamoxifen does not suppress estrogen manufacture by the ovaries, adrenals or adipose tissue. Tamoxifen covers the estrogen receptor on the surface of breast/breast cancer cells so that estrogen cannot bind there. If estrogen does bind, it causes the excitation of the cell that leads to proliferation/reproduction.
This is why your estrogen levels are normal for a premenopausal/perimenopausal woman (because there is no ovarian suppression involved with Tamoxifen alone).
Kind regards
Becky
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