<prompt> Aromatase enzymeConves estrogen to androgenConves androgen to estrogenHelps in maintaining normal placental blood flowConves testosterone to dihydrotestosterone  <response>: Aromatase enzyme conves androgens to estrogens.5a-Reductase conves testosterone to dihydrotestosteroneAromatase inhibitors block the function of the aromatase enzyme that conves androgens to estrogens. Aromatase inhibitors, including letrozole, anastrozole, and exemestane, are highly effective for both adjuvant and metastatic treatment of breast cancer in postmenopausal subjects,5a-Reductase inhibitors like finasteride, dutasteride are used in BPHGG 12e 1953 