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Risk factors

By Mayo Clinic staff

Having fibrocystic breasts doesn't increase your risk of breast cancer, unless the breast changes are associated with atypical hyperplasia (atypia) — the abnormal appearance and overgrowth of cells lining breast lobules and ducts. Women with atypia do have an increased risk of breast cancer compared with the general population.

DS01070

Aug. 20, 2008

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