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the claim

Estrogen replacement therapy increases the risk for breast cancer.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
3 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that estrogen replacement therapy increases the risk for breast cancer?

Yes. High-quality evidence, including large Cochrane reviews and population-based cohorts, indicates that hormone therapy—particularly combined estrogen-progestogen regimens or therapy initiated later in life—increases the risk of breast cancer.

Verdict: SUPPORTED · 3 sources for, 0 against · Last checked

The analysis

Multiple high-quality studies and reviews (such as the Cochrane systematic review and nationwide cohorts) consistently demonstrate an increased risk of breast cancer associated with hormone replacement therapy, particularly combined formulations and when used in specific populations or older age groups. Thus, the claim is well-supported by the provided evidence.

Evidence for · 3
Long-term hormone therapy for perimenopausal and postmenopausal women.
2026
This large Cochrane review and update indicates that combined continuous hormone therapy probably increases the risk of breast cancer.
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M, B. R., LN, Y., S, M., C, B., A, L., & C, F. (2026). Long-term hormone therapy for perimenopausal and postmenopausal women.. doi.org. https://doi.org/10.1002/14651858.cd004143.pub7

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More for · 2
Long-term systemic outcomes of postmenopausal hormone replacement therapy by age at menopause: a real-world cohort study.
2026
This real-world cohort study found that hormone replacement therapy initiated at an older age (>60 years) is associated with an increased hazard for breast cancer.
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TF, L., CH, L., YH, S., YF, C., CT, F., SJ, W., ST, H., CK, L., L, S., SF, H., & TH, L. (2026). Long-term systemic outcomes of postmenopausal hormone replacement therapy by age at menopause: a real-world cohort study.. doi.org. https://doi.org/10.1093/hropen/hoag072

Reduced Breast Cancer Risk in Women With A History of Pre-Eclampsia: Implications of Postmenopausal Hormone Therapy.
2026
This nationwide register-based study demonstrates that menopausal hormone therapy use is accompanied by a comparable increase in breast cancer risk.
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JM, J., O, Y., H, S., H, S., & TS, M. (2026). Reduced Breast Cancer Risk in Women With A History of Pre-Eclampsia: Implications of Postmenopausal Hormone Therapy.. doi.org. https://doi.org/10.1210/clinem/dgag271

What does the evidence say?

Multiple high-quality studies and reviews (such as the Cochrane systematic review and nationwide cohorts) consistently demonstrate an increased risk of breast cancer associated with hormone replacement therapy, particularly combined formulations and when used in specific populations or older age groups. Thus, the claim is well-supported by the provided evidence.

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