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  • Title: Elagolix for the management of heavy menstrual bleeding associated with uterine fibroids: results from a phase 2a proof-of-concept study.
    Author: Archer DF, Stewart EA, Jain RI, Feldman RA, Lukes AS, North JD, Soliman AM, Gao J, Ng JW, Chwalisz K.
    Journal: Fertil Steril; 2017 Jul; 108(1):152-160.e4. PubMed ID: 28579415.
    Abstract:
    OBJECTIVE: To evaluate the safety and efficacy of elagolix vs. placebo and elagolix with low-dose E2/progestogen add-back therapy. DESIGN: Proof-of-concept, dose-ranging, multiple-cohort study. SETTING: Clinics. PATIENT(S): Premenopausal women with fibroids and heavy menstrual bleeding (menstrual blood loss [MBL] >80 mL per cycle). INTERVENTION(S): Three months' treatment with elagolix alone: 100 mg twice daily (BID), 200 mg BID, 300 mg BID, 400 mg once daily (QD), or 600 mg QD (all but the 600 mg QD arm were placebo controlled); or elagolix plus add-back therapy: 200 mg BID plus continuous low-dose E2 0.5 mg/norethindrone acetate 0.1 mg or elagolix 300 mg BID plus E2 1 mg continuously and cyclical P 200 mg. MAIN OUTCOME MEASURE(S): Least-squares mean percentage change in MBL; adverse events (AEs). RESULT(S): Mean age was 41.8 years; 73.8% were black; mean baseline MBL was 267 mL. Of randomized women (elagolix alone, n = 160; placebo, n = 50; elagolix with add-back therapy, n = 61), 228 of 271 completed the 3-month treatment period. The MBL percentage change from baseline to last 28 days was significantly greater with elagolix alone (range, -72% to -98%; dose-dependent reduction was highest with 300 mg BID) vs. placebo (range, -8% to -41%); mean percentage changes with add-back regimens were -80% to -85%. Overall AEs were dose independent (elagolix alone, 70.0%-81.3%) but lower with placebo (56.0%) and add-back regimens (55.6%-70.6%). Hot flush was the most common AE (elagolix alone, 45.5%-62.5%; placebo, 12.0%; add-back regimens, 18.5%-26.5%). CONCLUSION(S): Elagolix significantly reduced heavy menstrual bleeding in women with fibroids. Low-dose add-back regimens substantially reduced flushing. CLINICAL TRIAL REGISTRATION NUMBER: NCT01441635.
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