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[Estracyt (estradiol-nitrogen mustard complex)--estramustine binding protein and its specificity].

H Yamanaka, K Imai, T Suzuki

    Gan to Kagaku Ryoho. Cancer & Chemotherapy
    |October 1, 1984
    PubMed
    Summary

    Estracyt (estramustine phosphate) effectively treats prostate cancer by binding to estramustine binding protein (EMBP). It shows high efficacy in both untreated and reactivated cases, particularly for adenocarcinoma.

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    Area of Science:

    • Oncology
    • Pharmacology
    • Biochemistry

    Context:

    • Estracyt (estramustine phosphate), a nitrogen mustard derivative of estradiol-17 beta, is rapidly dephosphorylated to estramustine.
    • Estramustine and its metabolite estromustine exhibit specific retention in rat prostate tissue.
    • This retention is attributed to binding with estramustine binding protein (EMBP).

    Purpose:

    • To investigate the molecular characteristics of estramustine binding components in prostate tissue.
    • To confirm the presence of EMBP in human prostate cancer cytosol.
    • To evaluate the clinical effectiveness of Estracyt in treating prostate cancer.

    Summary:

    • Estramustine binding components in rat prostate have molecular weights of 45,000-50,000 and 25,000-30,000 daltons.

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  • EMBP was identified in human prostate cancer cytosol with molecular weights of 45,000 and 25,000 daltons via HPLC.
  • Estracyt demonstrated significant effectiveness in clinical trials for both untreated and reactivated prostate cancer.

    • Impact:

    • Identifies EMBP as a key factor in estramustine retention within prostate cancer cells.
    • Provides evidence for Estracyt's efficacy as a first-line treatment for specific prostate cancer types.
    • Supports the use of Estracyt in managing untreated and reactivated prostate cancer, including poorly differentiated adenocarcinoma.