4812 Fulvestrant Fulvestrant is a drug treatment of hormone receptor-positive metastatic breast cancer in post-menopausal women with disease progression following anti-estrogen therapy. It is an estrogen receptor antagonist with no agonist effects, which works both by down-regulating and by degrading the estrogen receptor. 129453-61-8 17756771 C32H47F5O3S White powder. 6.72e-03 g/L Fulvestrant competitively and reversibly binds to estrogen receptors present in cancer cells and achieves its anti-estrogen effects through two separate mechanisms. First, fulvestrant binds to the receptors and downregulates them so that estrogen is no longer able to bind to these receptors. Second, fulvestrant degrades the estrogen receptors to which it is bound. Both of these mechanisms inhibit the growth of tamoxifen-resistant as well as estrogen-sensitive human breast cancer cell lines. Metabolism of fulvestrant appears to involve combinations of a number of possible biotransformation pathways analogous to those of endogenous steroids, including oxidation, aromatic hydroxylation, conjugation with glucuronic acid and/or sulphate at the 2, 3 and 17 positions of the steroid nucleus, and oxidation of the side chain sulphoxide. Identified metabolites are either less active or exhibit similar activity to fulvestrant in antiestrogen models. Studies using human liver preparations and recombinant human enzymes indicate that cytochrome P-450 3A4 (CYP 3A4) is the only P-450 isoenzyme involved in the oxidation of fulvestrant; however, the relative contribution of P-450 and non-P-450 routes in vivo is unknown. Route of Elimination: Fulvestrant was rapidly cleared by the hepatobiliary route with excretion primarily via the feces (approximately 90%). Renal elimination was negligible (less than 1%). Half Life: 40 days No indication of carcinogenicity to humans (not listed by IARC). For the treatment of hormone receptor positive metastatic breast cancer in postmenopausal women with disease progression following anti-estrogen therapy. There is no clinical experience with overdosage in humans. 2014-09-11T05:15:07Z 2026-03-26T22:09:31Z Fulvestrant 31638 DB00947 true [H][C@@]12CC[C@H](O)[C@@]1(C)CC[C@@]1([H])C2[C@H](CCCCCCCCCS(=O)CCCC(F)(F)C(F)(F)F)CC2=CC(O)=CC=C12 C32H47F5O3S InChI=1S/C32H47F5O3S/c1-30-17-15-26-25-12-11-24(38)21-23(25)20-22(29(26)27(30)13-14-28(30)39)10-7-5-3-2-4-6-8-18-41(40)19-9-16-31(33,34)32(35,36)37/h11-12,21-22,26-29,38-39H,2-10,13-20H2,1H3/t22-,26-,27+,28+,29?,30+,41?/m1/s1 VWUXBMIQPBEWFH-LQKBAPIOSA-N 606.771 606.316607085 Exogenous Solid 8.9 HMDB15082 CHEMBL1358 21475029 CHEM003714 DTXSID4022369 NS00004276 (1S,9R,11S,14S,15S)-15-methyl-9-[9-(4,4,5,5,5-pentafluoropentanesulfinyl)nonyl]tetracyclo[8.7.0.0²,⁷.0¹¹,¹⁵]heptadeca-2,4,6-triene-5,14-diol