Unanswered questions in hormonal replacement therapy

Area of Science:

• Endocrinology
• Menopause research
• Pharmacology

Background:

• Postmenopausal hormone therapy (HT) involves exogenous estrogens and progestins.
• Significant knowledge gaps persist regarding their long-term effects in postmenopausal women (PMW).
• Aging-related endocrine changes are not fully understood.

Purpose of the Study:

• To review and summarize existing literature on hormone replacement therapy (HRT) for PMW.
• To identify critical unanswered questions and areas of major concern.
• To examine the impact of selection bias in retrospective HRT studies.

Main Methods:

• Comprehensive literature review of studies on exogenous estrogens and progestins in PMW.
• Critical analysis of existing research to identify knowledge deficits.
• Focus on key areas including cardiovascular health, breast health, and menopausal symptoms.

Main Results:

• Progestin effects are less understood than estrogen effects.
• Estrogens benefit lipoprotein metabolism; progestins have detrimental effects.
• Estrogen's role in cardiovascular risk and breast cancer is unclear; progestins may have detrimental effects on breast health.
• The mechanism of hot flushes and estrogen's effects on mood, behavior, and dementia require further investigation.
• Optimal HT formulations, dosages, and administration routes remain undefined.

Conclusions:

• Significant uncertainties surround the use of exogenous estrogens and progestins in PMW.
• Further research is crucial to define the precise roles, risks, and benefits of HRT.
• Clarification is needed on selection bias, progestin actions, endocrine changes, and specific health outcomes.