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.