Isoflavone Effects on Cancer Risk and Hormonal Health
Summary
Isoflavones are naturally occurring plant compounds predominantly found in soybeans and related legumes. Structurally akin to oestrogens, they exert both oestrogenic and anti-oestrogenic actions through selective binding to oestrogen receptors, thereby influencing hormone-dependent processes. Extensive laboratory and clinical investigations have explored their potential in modulating the development and progression of hormone-sensitive cancers, notably breast and prostate malignancies. Mechanistically, isoflavones are implicated in the induction of apoptosis, inhibition of cell proliferation, regulation of angiogenesis and interference with signal transduction pathways such as PI3K/AKT and MAPK. Beyond cancer prevention, isoflavones have been evaluated for their role in alleviating menopausal symptoms, preserving bone density and impacting uterine health. Interindividual differences in gut microbial metabolism—particularly the conversion of daidzein to equol—contribute to variability in physiological responses. While epidemiological studies suggest a chemoprotective effect, results remain heterogeneous, underscoring the need for well-designed randomised trials to clarify optimal dosing, timing and long-term safety profiles.
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Isoflavone Effects on Cancer Risk and Hormonal Health publication trend
The graph below shows the total number of articles in isoflavone effects on cancer risk and hormonal health across all publications each year (not limited to Nature Index journals).
Technical terms
Isoflavones: A subclass of flavonoids found in legumes that can mimic or modulate oestrogen activity.
Phytoestrogens: Plant-derived compounds with structural similarity to vertebrate oestrogens capable of binding oestrogen receptors.
Oestrogen receptors (ERα and ERβ): Nuclear hormone receptors that mediate the genomic and non-genomic actions of oestrogens and phytoestrogens.
Equol: A bioactive metabolite of daidzein produced by certain gut bacteria, exhibiting higher oestrogenic potency.
Apoptosis: Programmed cell death mechanism often targeted in cancer prevention strategies.
References
- Effect of Isoflavones on Blood Lipid Alterations in Postmenopausal Females: A Systematic Review and Meta-Analysis of Randomized Trials. Advances in Nutrition (2023).
- Soy-Based Infant Formula Feeding and Uterine Fibroid Development in a Prospective Ultrasound Study of Black/African-American Women. Environmental Health Perspectives (2023).
- Isoflavones. Molecules (2019).
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