Back to Search Start Over

Menopausal hormone therapy and breast cancer risk: a population-based cohort study of 1.3 million women in Norway.

Authors :
Støer NC
Vangen S
Singh D
Fortner RT
Hofvind S
Ursin G
Botteri E
Source :
British journal of cancer [Br J Cancer] 2024 Jul; Vol. 131 (1), pp. 126-137. Date of Electronic Publication: 2024 May 13.
Publication Year :
2024

Abstract

Background: It is important to monitor the association between menopausal hormone therapy (HT) use and breast cancer (BC) risk with contemporary estimates, and specifically focus on HT types and new drugs.<br />Methods: We estimated hazard ratios (HR) of BC risk according to HT type, administration route and individual drugs, overall and stratified by body mass index (BMI), molecular subtype and detection mode, with non-HT use as reference.<br />Results: We included 1,275,783 women, 45+ years, followed from 2004, for a median of 12.7 years. Oral oestrogen combined with daily progestin was associated with the highest risk of BC (HR 2.42, 95% confidence interval (CI) 2.31-2.54), with drug-specific HRs ranging from Cliovelle®: 1.63 (95% CI 1.35-1.96) to Kliogest®: 2.67 (2.37-3.00). Vaginal oestradiol was not associated with BC risk. HT use was more strongly associated with luminal A cancer (HR 1.97, 95% CI 1.86-2.09) than other molecular subtypes, and more strongly with interval (HR 2.00, 95% CI: 1.83-2.30) than screen-detected (HR 1.33, 95% CI 1.26-1.41) BC in women 50-71 years. HRs for HT use decreased with increasing BMI.<br />Conclusions: The use of oral and transdermal HT was associated with an increased risk of BC. The associations varied according to HT type, individual drugs, molecular subtype, detection mode and BMI.<br /> (© 2024. World Health Organization and The Author(s).)

Details

Language :
English
ISSN :
1532-1827
Volume :
131
Issue :
1
Database :
MEDLINE
Journal :
British journal of cancer
Publication Type :
Academic Journal
Accession number :
38740969
Full Text :
https://doi.org/10.1038/s41416-024-02590-1