That's how I read it:
Quote:
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The PET scans, taken before, during and after hormonal therapy, confirmed the superior effectiveness of estrogen-receptor-blocking drugs such as tamoxifen and fulvestrant over estrogen-depleting therapies such as aromatase inhibitors in blocking the estrogen receptor in cancer cells. The study also confirmed that tamoxifen is superior to fulvestrant in blocking estrogen.
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This begs the question regarding Fulvestrant's ability to often work after Tamoxifen doesn't. Must be more to situation than estrogen.
And it's also supportive of a few oncologist's use of AI along with SERMS like Tamoxifen or Fulvestrant.