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<a href=https://buycialis.beauty>purchase cialis online</a> Several strategies for inhibiting the estrogen axis in breast cancer exist, including selective ER modulators such as tamoxifen and raloxifene, which act as selective tissue specific antagonists of ER in the breast 9; selective ER degraders such as fulvestrant, which promote ER turnover 10; and aromatase inhibitors such as exemestane steroidal aromatase inhibitors, anastazole and letrazole nonsteroidal aromatase inhibitors agents primarily used in postmenopausal women with ER positive breast cancer which inhibit estrogen biosynthesis 11