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Title: Effects of obesity and hormone therapy on surgically-confirmed fibroids in postmenopausal women
Authors: Sommer EM; Balkwill A; Reeves G; Green J; Beral DV; Coffey K
Year: 2015
Journal Title: European Journal of Epidemiology
Volume: 30
Issue: 6
Page number start: 493
Page number end: 499
Citation: Sommer EM, Balkwill A, Reeves G, Green J, Beral DV, Coffey K; Million Women Study Collaborators (incl Canfell K). Effects of obesity and hormone therapy on surgically-confirmed fibroids in postmenopausal women. Eur J Epidemiol 2015;30(6):493-9
Abstract: To examine the association between body mass index (BMI), use of menopausal hormone therapy (HT), and incidence of uterine fibroids in postmenopausal women, 610,604 postmenopausal women without prior hysterectomy or diagnosis of fibroids were followed as part of a large United Kingdom prospective cohort study. We used Cox regression models to calculate adjusted relative risks (RRs) of surgically-confirmed fibroids (defined as a hospital admission with uterine fibroids as a primary diagnosis with a related surgical procedure), in relation to BMI and use of HT. During an average of 11.4 years of follow-up, 3561 women were admitted to hospital with surgically-confirmed fibroids. Five-year incidence rates decreased with age, from 0.50 % (1 in 200 women) at age 50–54, to 0.11 % (1 in 1000 women) at age 75–79. The 5-year rate in postmenopausal women aged 50–54 was about a quarter that seen in premenopausal women of the same age (1 in 200 vs. 1 in 50). Compared with normal weight women, obese women had a RR of surgically-detected fibroids of 1.46 (95 % CI 1.33–1.59; p < 0.0001). HT use was associated with a RR of 2.33 (95 % CI 2.18–2.49; p < 0.0001) in ever versus never users. When we analysed HT use and BMI together, obese vs. normal weight never users had a RR of 2.00 (95 % CI 1.77–2.26): the highest risks were seen in women who were obese and had ever used HT, RR = 3.30 (95 % CI 2.88–3.79). Uterine fibroids continue to occur in postmenopausal women; obesity and hormone therapy use are important modifiable risk factors.
Description: On behalf of The Million Women Study Collaborators (incl. Canfell K)
Division: Cancer Research Division
Funding Body: This research was funded by Cancer Research UK, the National Health Service Breast Screening Programme, and the Medical Research Council UK. KC is supported by Cancer Research UK grant number C38302/A12981, through an Oxford Cancer Research Centre Prize DPhil Studentship
DOI: 10.1007/s10654-015-0016-7
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