aromatase inhibitor (ă-roh-mă-tayz) n. any of a class of drugs used in the treatment of oestrogen-dependent breast cancer in postmenopausal women. By inhibiting the action of aromatase, an enzyme that promotes the conversion of testosterone to oestradiol, they reduce oestrogen levels. Aromatase inhibitors include anastrazole (Arimidex), exemestane (Aromasin), and letrozole (Femara).
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