Estrogen linked to benign breast lumps

WASHINGTON (AP) -- Researchers are linking estrogen therapy to benign breast lumps in women.

It's the latest risk connected to hormone therapy after menopause.

Another type of hormone therapy -- estrogen plus progestin -- is already known to raise the risk of breast cancer. Now researchers are finding that women using estrogen alone may double their chances of getting non-cancerous breast lumps.

That raises concerns beyond the extra biopsies and worries such lumps can lead to. That's because one type of benign growth is suspected of being a first step toward developing cancer 10 years or so later.

The study is published in the Journal of the National Cancer Institute.

(Copyright 2008 by The Associated Press. All Rights Reserved.)

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