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Clinical data
Other namesLY-133,314
Routes of
ATC code
  • none
CAS Number
PubChem CID
CompTox Dashboard (EPA)
Chemical and physical data
Molar mass453.57 g/mol g·mol−1

Trioxifene (INN) (developmental code name LY-133,314), or as the salt trioxifene mesylate (USAN), is a selective estrogen receptor modulator (SERM) with competitive binding activity against estradiol for the ERα and antagonistic activity against ERα-mediated gene expression, that was under preclinical and clinical development by Eli Lilly and Company for breast cancer and prostate cancer,[1] but was abandoned.[2]:11[3][4]


  1. ^ Neubauer BL, McNulty AM, Chedid M, Chen K, Goode RL, Johnson MA, Jones CD, Krishnan V, Lynch R, Osborne HE, Graff JR (September 2003). "The selective estrogen receptor modulator trioxifene (LY133314) inhibits metastasis and extends survival in the PAIII rat prostatic carcinoma model". Cancer Research. 63 (18): 6056–62. PMID 14522935.
  2. ^ Philipp Y. Maximov, Russell E. McDaniel, V. Craig Jordan. Tamoxifen: Pioneering Medicine in Breast Cancer. Milestones in Drug Therapy. Springer Science & Business Media, 2013. ISBN 9783034806640
  3. ^ J. Elks (14 November 2014). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. pp. 1252–. ISBN 978-1-4757-2085-3.
  4. ^ I.K. Morton; Judith M. Hall (6 December 2012). Concise Dictionary of Pharmacological Agents: Properties and Synonyms. Springer Science & Business Media. pp. 281–. ISBN 978-94-011-4439-1.