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One of the largest breast cancer prevention studies ever, [2] it included 22,000 women in 400 medical centers in the United States and Canada. [3] [4] [5] The study concluded that raloxifene caused fewer side-effects and less endometrial cancer than tamoxifen.
The effects of tamoxifen on breast cancer Ki-67 expression, sex hormone-binding globulin (SHBG) levels, and IGF-1 levels are dose-dependent across a dosage range of 1 to 20 mg/day in women with breast cancer. [84] Tamoxifen has been found to decrease insulin-like growth factor 1 (IGF-1) levels by 17 to 38% in women and men. [85]
It is used as endocrine therapy for women with estrogen or progesterone receptor-positive, stage 4 or recurrent metastatic breast cancer [7] and has demonstrated similar efficacy compared to tamoxifen as adjuvant treatment of breast cancer and in the treatment of metastatic breast cancer. [6] Raloxifene is used for the prevention and treatment ...
There were no obvious differences in effectiveness of raloxifene in the MORE trial for prevention of breast cancer at a dosage of 60 mg/m 2 /day relative to 120 mg/m 2 /day. [14] In the Study of Tamoxifen and Raloxifene (STAR) trial, 60 mg/day raloxifene was 78% as effective as 20 mg/day tamoxifen in preventing non-invasive breast cancer. [15]
Tamoxifen is currently first-line treatment for nearly all pre-menopausal women with hormone receptor-positive breast cancer. [1] Raloxifene is another partial agonist SERM which does not seem to promote endometrial cancer , and is used primarily for chemoprevention of breast cancer in high-risk individuals, as well as to prevent osteoporosis ...
The antiestrogen withdrawal syndrome is analogous to but less common and well-known than the antiandrogen withdrawal syndrome, a phenomenon in which paradoxical improvement in prostate cancer occurs upon discontinuation of antiandrogen therapy. [4]
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