Effect of low-dose tamoxifen on benign gynecological and breast conditions in a phase III trial in non-invasive breast cancer

  • 0EO Ospedali Galliera, Genoa, Italy.

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Summary

This summary is machine-generated.

Low-dose tamoxifen (5mg/day) significantly reduces breast cancer recurrence with minimal toxicity over 10 years. Benign gynecological and breast events were similar to placebo, reinforcing its favorable safety profile.

Area Of Science

  • Oncology
  • Pharmacology
  • Clinical Trials

Background

  • Tamoxifen is effective for breast cancer prevention but limited by side effects.
  • A previous phase III trial demonstrated low-dose tamoxifen (5 mg/day) efficacy in reducing recurrence with minimal toxicity.

Purpose Of The Study

  • To evaluate the long-term (10-year) safety and incidence of benign gynecological and breast events associated with low-dose tamoxifen therapy for breast cancer prevention.

Main Methods

  • A 10-year follow-up of a phase III trial comparing low-dose tamoxifen (5 mg/day) against a placebo.
  • Systematic monitoring and reporting of benign gynecological events (uterine, ovarian) and breast events.

Main Results

  • No significant differences in benign gynecological or breast events were observed between the low-dose tamoxifen and placebo groups after 10 years.
  • The uterus was the most frequently affected site, with similar rates of endometrial polyps in both arms.
  • Endometrial thickness remained stable in premenopausal women and showed a minimal, non-clinically significant increase in postmenopausal women on low-dose tamoxifen.

Conclusions

  • Low-dose tamoxifen exhibits a favorable long-term safety profile for breast cancer prevention.
  • The incidence of benign events with low-dose tamoxifen is lower compared to standard-dose tamoxifen.
  • Low-dose tamoxifen represents a safe and effective option for breast cancer risk reduction.