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Clinical data
Other names3-Methylene-7α-methylethinylestradiol; 3-Methylene-7α-methyl-17α-ethynylestra-5(10)-en-17β-ol[1]
  • (7R,8R,9S,13S,14S,17R)-17-Ethynyl-7,13-dimethyl-3-methylidene-1,2,4,6,7,8,9,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-17-ol
PubChem CID
Chemical and physical data
Molar mass310.481 g·mol−1
3D model (JSmol)
  • C[C@@H]1CC2=C(CCC(=C)C2)[C@@H]3[C@@H]1[C@@H]4CC[C@]([C@]4(CC3)C)(C#C)O
  • InChI=1S/C22H30O/c1-5-22(23)11-9-19-20-15(3)13-16-12-14(2)6-7-17(16)18(20)8-10-21(19,22)4/h1,15,18-20,23H,2,6-13H2,3-4H3/t15-,18-,19+,20-,21+,22+/m1/s1

ERA-63, also known as ORG-37663, as well as 3-methylene-7α-methyl-17α-ethynylestra-5(10)-en-17β-ol, is a synthetic, steroidal estrogen and a selective agonist of the ERα that was under development for the treatment of rheumatoid arthritis but was never marketed.[2][1] The drug produced estrogenic effects but failed to show effectiveness for rheumatoid arthritis in a phase IIa clinical study.[3][4] A large clinical trial also found that prinaberel (ERB-041), a selective ERβ agonist, was ineffective in the treatment of rheumatoid arthritis in spite of activity in preclinical models.[4]

See also[edit]


  1. ^ a b Janssen GB, Penninks AH, Knippels LM, van Zijverden M, Spanhaak S (2008). "The evaluation of the immunomodulating properties of ERA-63 a pharmaceutical with estrogenic activity". Toxicol. Lett. 180 (3): 196–201. doi:10.1016/j.toxlet.2008.06.857. PMID 18602456.
  2. ^ Dulos, J., Hofstra, C. L., Joosten, LAB, Veening-Griffioen, D. H., Lucassen, M. A., Doorn, C. M., ... & Boots, A. M. H. (2006, July). A selective estrogen receptor alpha agonist (Org 37663) suppresses inflammation and arthritis in mouse models. In ANNALS OF THE RHEUMATIC DISEASES (Vol. 65, pp. 128-128). BRITISH MED ASSOC HOUSE, TAVISTOCK SQUARE, LONDON WC1H 9JR, ENGLAND: BMJ PUBLISHING GROUP.
  3. ^ van Vollenhoven RF, Houbiers JG, Buttgereit F, In 't Hout J, Boers M, Leij S, Kvien TK, Dijkmans BA, Szczepański L, Szombati I, Sierakowski S, Miltenburg AM (2010). "The selective estrogen receptor alpha agonist Org 37663 induces estrogenic effects but lacks antirheumatic activity: a phase IIa trial investigating efficacy and safety of Org 37663 in postmenopausal female rheumatoid arthritis patients receiving stable background methotrexate or sulfasalazine". Arthritis Rheum. 62 (2): 351–8. doi:10.1002/art.27196. PMID 20112368.
  4. ^ a b Cutolo M (2010). "Selective estrogen receptor agonism lacks clinical benefit in rheumatoid arthritis: comment on the article by van Vollenhoven et al". Arthritis Rheum. 62 (12): 3832–3. doi:10.1002/art.27722. PMID 21120998.