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[Hormone replacement therapy and breast cancer]
1Department of Obstetrics & Gynecology, Teikyo University School of Medicine, Tokyo, Japan.
Gan to Kagaku Ryoho. Cancer & Chemotherapy
|July 9, 1999
Summary
Hormone replacement therapy (HRT) significantly increases breast cancer risk in users, according to a large-scale reanalysis of international studies. The impact of HRT on breast cancer mortality remains undetermined.
Area of Science:
- Endocrinology
- Oncology
- Epidemiology
Context:
- Hormone replacement therapy (HRT) involves estrogen and progesterone, with controversial effects on breast cancer.
- Histological changes in breast tissue due to exogenous hormones in postmenopausal women are debated.
- Previous epidemiological studies showed inconsistent findings on HRT and breast cancer risk.
Purpose:
- To evaluate the role of estrogen and progesterone in HRT regarding breast cancer causation and promotion.
- To clarify the histological influence of exogenous estrogen and progestin on postmenopausal breast tissue.
- To consolidate and reanalyze international epidemiological evidence on HRT and breast cancer risk.
Summary:
- A comprehensive reanalysis of global epidemiological data by the Collaborative Group on Hormonal Factors in Breast Cancer was conducted.
- Findings indicate a statistically significant increase in breast cancer risk associated with HRT use.
- The effect of HRT on breast cancer-specific mortality has not yet been determined.
Impact:
- Provides robust evidence linking HRT use to elevated breast cancer risk.
- Highlights the need for further research into HRT's long-term effects on breast cancer outcomes, particularly mortality.
- Informs clinical practice and patient counseling regarding the risks and benefits of HRT.