Breast Cancer Risk
Breast cancer risk is elevated for small fraction of lesions. Nonproliferative lesions have no increased risk, proliferative lesions approximately 2-fold risk. Atypical lobular hyperplasia is associated with the greatest risk, approximately 5-fold and especially high relative risk of developing premenopausal breast cancer. Atypical ductal hyperplasia is associated with 2.4-fold risk.
It is not well understood whether the lesions are precursors of breast cancer or only indication of increased risk, for most types of lesions the chance of developing breast cancer is nearly the same in the affected and unaffected breast (side) indicating only coincidence of risk factors. For atypical lobular hyperplasia there is high incidence of ipsilateral breast cancers indicating a possible direct carcinogenetic link.
Read more about this topic: Fibrocystic Breast Changes
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