GW7604 is an antiestrogen. GW7604 is the metabolite of GW5638, which is a high affinity estrogen receptor (ER) antagonist. In Vitro GW7604 is the presumed metabolite of GW5638 in breast (MCF-7) and endometrial (ECC-1) cell lines. GW7604 (0.1 nM-1 μM; 24 hours) inhibits both Estradiol (1 nM) and 4-hydroxytamoxifen (4-OHT; 10 and 100 nM) induction of TGF-alpha in a concentration related manner (1-1000 nM) in MDA-MB-231 cells. MCE has not independently confirmed the accuracy of these methods. They are for reference only. Western Blot AnalysisCell Line: MDA-MB-231 cells Concentration: 0.1 nM, 1 nM, 10 nM, 100 nM, 1 μM Incubation Time: 24 hours Result: Blocked the effect of estradiol (E2; 1 n M) in a concentration-related manner. Form:Solid