Prior hrt use, ethnicity and mammographic density.

Area of Science:

• Biomedical research
• Radiology
• Epidemiology

Background:

• Mammographic density is a significant risk factor for breast cancer.
• Understanding factors influencing mammographic density is crucial for elucidating pathogenic mechanisms.
• This study focuses on postmenopausal women not currently using hormone replacement therapy (HRT).

Purpose of the Study:

• To assess factors affecting mammographic density in postmenopausal women.
• To identify predictors of mammographic density, including demographic, lifestyle, and medical history variables.

Main Methods:

• Percent density (PD) was measured using a computer-assisted thresholding technique on mammograms from 425 postmenopausal women.
• Univariate analyses examined relationships between PD and various factors (age, parity, BMI, WHR, ethnicity, HRT use, etc.).
• Multivariable regression was employed to identify independent predictors of PD, controlling for confounders.

Main Results:

• Age, gravidity, body mass index (BMI), and waist-to-hip ratio (WHR) were negatively associated with PD.
• Black women exhibited higher PD compared to other ethnicities after controlling for confounders.
• Prior HRT use was associated with lower PD, but this effect was significant only in women who had undergone a hysterectomy.

Conclusions:

• Mammographic density in postmenopausal women is associated with gravidity, ethnicity, and body composition.
• Previous HRT use may be linked to lower mammographic density, particularly in hysterectomized women, potentially due to oophorectomy frequency.
• Further analysis of a larger sample is planned to clarify these associations and density changes over time.