Harvard Health Letter

Preventing cancer: Are we getting closer?

A drug now used in breast cancer treatment may have the potential to prevent the disease in some women. Exemestane is in a class of drugs called aromatase inhibitors, which women take for several years after they've been treated for breast cancer to reduce the chances of getting breast cancer again. Aromatase is an enzyme that's crucial to the production of the hormone estrogen, which in many cases fuels the development and growth of breast cancer. So by inhibiting aromatase, exemestane lowers estrogen levels and therefore the risk of breast cancer recurrence.
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