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Inhibition of prostate cancer growth by vinblastine and tamoxifen

K J Pienta1, T Replogle, J E Lehr

  • 1Meyer L Prentis Comprehensive Cancer Center, Wayne State University School of Medicine, Detroit, Michigan, USA.

The Prostate
|May 1, 1995
PubMed

Insights

Tamoxifen and vinblastine, microtubule inhibitors, show promise against hormone refractory prostate cancer. This combination proved cytotoxic to cancer cells and inhibited tumor growth in preclinical models.

Area of Science:

  • Oncology
  • Pharmacology

Background:

  • Hormone refractory prostate cancer is an aggressive, fatal disease.
  • Microtubule-inhibiting agents demonstrate cytotoxicity against prostate cancer cells.

Purpose of the Study:

  • To evaluate the efficacy of tamoxifen and vinblastine in hormone refractory prostate cancer.
  • To assess the combined activity of these two microtubule inhibitors.

Main Methods:

  • In vitro cytotoxicity assays using Dunning rat prostate adenocarcinoma (MLL) and human prostate cancer (PC-3) cell lines.
  • Cell cycle analysis to determine effects on cell transit.
  • In vivo studies using implanted MLL cells to assess tumor growth inhibition.

Main Results:

  • Tamoxifen and vinblastine demonstrated cytotoxicity against both MLL and PC-3 cells at clinically achievable concentrations.
  • Both agents inhibited cell cycle progression.
  • In vivo, the combination therapy suppressed the growth of implanted MLL tumors.

Conclusions:

  • Tamoxifen and vinblastine exhibit potential as effective agents for treating hormone refractory prostate cancer.
  • The combination therapy warrants further investigation for clinical application.

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