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Hormone replacement therapy and risk of venous thromboembolism in postmenopausal women: systematic review and meta-analysis
Open accessAbstract
OBJECTIVE: To assess the risk of venous thromboembolism in women using hormone replacement therapy by study design, characteristics of the therapy and venous thromboembolism, and clinical background. DESIGN: Systematic review and meta-analysis. DATA SOURCES: Medline. STUDIES REVIEWED: Eight observational studies and nine randomised controlled trials. INCLUSION CRITERIA: Studies on hormone replacement therapy that reported venous thromboembolism. REVIEW MEASURES: Homogeneity between studies was analysed using chi(2) and I(2) statistics. Overall risk of venous thromboembolism was assessed from a fixed effects or random effects model. RESULTS: Meta-analysis of observational studies showed that oral oestrogen but not transdermal oestrogen increased the risk of venous thromboembolism. Compared with non-users of oestrogen, the odds ratio of first time venous thromboembolism in current users of oral oestrogen was 2.5 (95% confidence interval 1.9 to 3.4) and in current users of transdermal oestrogen was 1.2 (0.9 to 1.7). Past users of oral oestrogen had a similar risk of venous thromboembolism to never users. The risk of venous thromboembolism in women using oral oestrogen was higher in the first year of treatment (4.0, 2.9 to 5.7) compared with treatment for more than one year (2.1, 1.3 to 3.8; P<0.05). No noticeable difference in the risk of venous thromboembolism was observed between unopposed oral oestrogen (2.2, 1.6 to 3.0) and opposed oral oestrogen (2.6, 2.0 to 3.2). Results from nine randomised controlled trials confirmed the increased risk of venous thromboembolism among women using oral oestrogen (2.1, 1.4 to 3.1). The combination of oral oestrogen and thrombogenic mutations or obesity further enhanced the risk of venous thromboembolism, whereas transdermal oestrogen did not seem to confer additional risk in women at high risk of venous thromboembolism. CONCLUSION: Oral oestrogen increases the risk of venous thromboembolism, especially during the first year of treatment. Transdermal oestrogen may be safer with respect to thrombotic risk. More data are required to investigate differences in risk across the wide variety of hormone regimens, especially the different types of progestogens.
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“The increasing risk of VTE with duration of estrogen use is in contrast with menopausal hormonal therapy, where the risk is highest in the first year of use and decreases with time. [122]”
From Estrogen and thrombosis: a bench to bedside review (2020) · cites this paper as [122]
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Metadata
- Authors
- Canonico, M., Plu-Bureau, G., Lowe, G. D. O., & Scarabin, P.-Y.
- Affiliations
- Université Paris-Sud (FR)
- Glasgow Royal Infirmary (GB)
- Corresponding author
- Canonico, Marianne
- Venue
- BMJ
- Publisher
- BMJ
- Published
- 2008-05-20
- Volume
- 336
- Issue
- 7655
- Pages
- 1227-1231
- ISSN
- 0007-1447 (ISSN-L)
- 0959-8138
- 1468-5833
- PMC
- PMC2405857
- OpenAlex
- W2008660261
- Cited by
- 569
- References
- 73
- Citations by year
- 2026: 25 · 2025: 31 · 2024: 20 · 2023: 17 · 2022: 29 · 2021: 30 · 2020: 21 · 2019: 29 · 2018: 27 · 2017: 26 · 2016: 30 · 2015: 28 · 2014: 32 · 2013: 45 · 2012: 35
- FWCI
- 6.50
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- BMJ (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- HAL (submittedVersion, other-oa)
- HighWire Press Open Archive (submittedVersion)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Menopause: Health Impacts and Treatments
- Health Sciences › Medicine › Internal Medicine › Venous Thromboembolism Diagnosis and Management
- Health Sciences › Medicine › Clinical Neurology › Cerebral Venous Sinus Thrombosis
- Keywords
- hormone replacement therapy, venous thromboembolism, postmenopausal women, oral estrogen, transdermal estrogen, obesity, unopposed estrogen, progestogens, thrombosis risk, treatment duration
- MeSH terms
- Administration, Cutaneous, Administration, Oral, Female, Humans, Risk, Risk Factors, Estrogen Replacement Therapy, Randomized Controlled Trials as Topic, Postmenopause, Venous Thromboembolism
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