Nafoxidine

Nafoxidine (INNTooltip International Nonproprietary Name; developmental code names U-11,000A) or nafoxidine hydrochloride (USANTooltip United States Adopted Name) is a nonsteroidal selective estrogen receptor modulator (SERM) or partial antiestrogen of the triphenylethylene group that was developed for the treatment of advanced breast cancer by Upjohn in the 1970s but was never marketed. It was developed at around the same time as tamoxifen and clomifene, which are also triphenylethylene derivatives. The drug was originally synthesized by the fertility control program at Upjohn as a postcoital contraceptive, but was subsequently repurposed for the treatment of breast cancer. Nafoxidine was assessed in clinical trials in the treatment of breast cancer and was found to be effective. However, it produced side effects including ichthyosis, partial hair loss, and phototoxicity of the skin in almost all patients, and this resulted in the discontinuation of its development.

Nafoxidine
Clinical data
Other namesU-11,000A; NSC-70735
Routes of
administration		By mouth
ATC code
  • None
Identifiers
  • 1-[2-[4-(6-Methoxy-2-phenyl-3,4-dihydronaphthalen-1-yl)phenoxy]ethyl]pyrrolidine
CAS Number
PubChem CID
IUPHAR/BPS
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard100.222.756
Chemical and physical data
FormulaC29H31NO2
Molar mass425.572 g·mol−1
3D model (JSmol)
  • COC1=CC2=C(C=C1)C(=C(CC2)C3=CC=CC=C3)C4=CC=C(C=C4)OCCN5CCCC5
  • InChI=1S/C29H31NO2/c1-31-26-14-16-28-24(21-26)11-15-27(22-7-3-2-4-8-22)29(28)23-9-12-25(13-10-23)32-20-19-30-17-5-6-18-30/h2-4,7-10,12-14,16,21H,5-6,11,15,17-20H2,1H3
  • Key:JEYWNNAZDLFBFF-UHFFFAOYSA-N

Nafoxidine is a long-acting estrogen receptor ligand, with a nuclear retention in the range of 24 to 48 hours or more.

Comparison of early clinical experience with antiestrogens for advanced breast cancer
Antiestrogen Dosage Year(s) Response rate Adverse effects
Ethamoxytriphetol 500–4,500 mg/day 1960 25% Acute psychotic episodes
Clomifene 100–300 mg/day 1964–1974 34% Risks of cataracts
Nafoxidine 180–240 mg/day 1976 31% Cataracts, ichthyosis, photophobia
Tamoxifen 20–40 mg/day 1971–1973 31% Transient thrombocytopeniaa
Footnotes: a = "The particular advantage of this drug is the low incidence of troublesome side effects (25)." "Side effects were usually trivial (26)." Sources:
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