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Estrogens, antiestrogens and cell proliferation.

O L Kon

    Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
    |June 1, 1989
    PubMed
    Summary
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    The classical estrogen receptor model needs updates. Estrogens may promote tumors via growth factors, and anti-estrogens may work through estrogen receptor-independent pathways, explaining treatment resistance.

    Area of Science:

    • Endocrinology
    • Cancer Biology
    • Molecular Pharmacology

    Background:

    • The classical estrogen receptor (ER) model inadequately explains estrogen's role in tumor promotion and anti-estrogen efficacy in ER-dependent cancers.
    • Hormonal autonomy in tumors can develop without ER loss, and anti-estrogen effects vary with context, irrespective of ER or anti-estrogen metabolism.

    Purpose of the Study:

    • To review and discuss the limitations of the classical ER model in explaining complex estrogen signaling in cancer.
    • To explore alternative mechanisms by which estrogens and anti-estrogens influence tumor growth and response to therapy.

    Main Methods:

    • Literature review of recent studies on estrogen signaling and anti-estrogen mechanisms.
    • Analysis of findings suggesting roles for growth factors and ER-independent pathways.

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    Main Results:

    • Estrogens may promote cell proliferation partially through growth factor mediation.
    • Anti-estrogens can exert antiproliferative effects via mechanisms not directly involving the estrogen receptor.

    Conclusions:

    • The classical ER model is insufficient to fully explain estrogen's role in tumorigenesis and anti-estrogen action.
    • Emerging evidence points to the involvement of growth factors and ER-independent pathways in mediating these effects, necessitating revised therapeutic strategies.