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the claim

Polycystic ovary syndrome is linked to a higher risk of breast cancer.

the verdict
CONTESTED PARTIAL
Recorded sources
2 sources for · 1 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 polycystic ovary syndrome is linked to a higher risk of breast cancer?

Partly. Two reviews suggest PCOS may be modestly associated with higher breast cancer risk, but both describe the evidence as inconsistent or inconclusive, and a third review reports that most epidemiological studies found no significant association. The retrieved evidence covers only part of the claim and does not settle it.

Verdict: CONTESTED PARTIAL · 2 sources for, 1 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 2
Polycystic ovary syndrome and breast cancer risk: a systematic review.
2026
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F, C., S, P., G, S., AR, B., & D, C. (2026). Polycystic ovary syndrome and breast cancer risk: a systematic review.. doi.org. https://doi.org/10.1016/j.ejogrb.2026.115248

Evidence against · 1
Association between Polycystic Ovary Syndrome and Breast Cancer: A Review
2020
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Association between Polycystic Ovary Syndrome and Breast Cancer: A Review. (2020). hal.science. https://hal.science/hal-05284597v1

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More for · 1
PCOS and breast cancer risk: hormonal modulation and epidemiological trends.
2026
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JP, K., R, D., G, V., A, K., SK, A., N, K., & G, K. (2026). PCOS and breast cancer risk: hormonal modulation and epidemiological trends.. doi.org. https://doi.org/10.1186/s12978-026-02355-4

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