Breast Hormones and Mammographic Density
Author Information
Author(s): Boyd N F, Stone J, Martin L J, Jong R, Fishell E, Yaffe M, Hammond G, Minkin S
Primary Institution: Ontario Cancer Institute
Hypothesis
What is the association between circulating levels of hormones and growth factors with mammographic density?
Conclusion
The study found that blood levels of certain hormones and growth factors are associated with mammographic density, suggesting a biological basis for breast cancer risk.
Supporting Evidence
- Serum insulin-like growth factor-I levels were positively associated with mammographic density in premenopausal women.
- Prolactin levels were positively associated with mammographic density in postmenopausal women.
- Free oestradiol was negatively associated with mammographic density in postmenopausal women.
- Sex hormone binding globulin was positively associated with mammographic density in postmenopausal women.
Takeaway
This study looked at how hormones in the blood relate to the density of breast tissue seen in mammograms, which can affect breast cancer risk.
Methodology
The study involved measuring hormone levels in blood samples from premenopausal and postmenopausal women with varying mammographic densities.
Potential Biases
Potential bias in self-reported risk factors and selection of participants.
Limitations
The phase of the menstrual cycle at the time of mammogram was not known, which could affect hormone levels.
Participant Demographics
193 premenopausal and 189 postmenopausal women, mean ages 45 and 56 respectively.
Statistical Information
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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