Estrogen Linked to Benign Breast Lumps

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WASHINGTON - Add another risk to hormone therapy after menopause: Benign breast lumps. One type of hormone therapy — estrogen plus progestin — already is well-known to increase the risk of breast cancer. But a major study of women able to use estrogen alone didn't find that link.

Tuesday, researchers reported a new wrinkle: Those estrogen-only users doubled their chances of getting non-cancerous breast lumps. That's a concern not only because of the extra biopsies and worry those lumps cause, but because a particular type — called benign proliferative breast disease — is suspected of being a first step toward developing cancer 10 years or so later.