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Clinical data
Synonyms HE3235; Apoptone; 17α-Ethynyl-5α-androstane-3α,17β-diol; 5α-Pregn-20-yne-3α,17α-diol
CAS Number
PubChem CID
Chemical and physical data
Formula C21H32O2
Molar mass 316.49 g·mol−1
3D model (JSmol)

Ethynylandrostanediol (developmental code name HE-3235), or 17α-ethynyl-5α-androstane-3α,17β-diol, also known as Apoptone, is a synthetic, orally active, 17α-substituted analogue of the androstanediols which was under development for the treatment of prostate cancer and breast cancer but was discontinued.[1][2][3] It has very low affinity for steroid receptors, including the AR, ERα, ERβ, PR, and GR, and its mechanism of action is not well-characterized.[1][4] It produces 5α-dihydroethisterone as an active metabolite, which may contribute importantly to its biological activity.[1]


  1. ^ a b c Ahlem C, Kennedy M, Page T, Bell D, Delorme E, Villegas S, Reading C, White S, Stickney D, Frincke J (2012). "17α-alkynyl 3α, 17β-androstanediol non-clinical and clinical pharmacology, pharmacokinetics and metabolism". Invest New Drugs. 30 (1): 59–78. doi:10.1007/s10637-010-9517-0. PMID 20814732. 
  2. ^ Trauger R, Corey E, Bell D, White S, Garsd A, Stickney D, Reading C, Frincke J (2009). "Inhibition of androstenediol-dependent LNCaP tumour growth by 17alpha-ethynyl-5alpha-androstane-3alpha, 17beta-diol (HE3235)". Br. J. Cancer. 100 (7): 1068–72. doi:10.1038/sj.bjc.6604987. PMC 2669987Freely accessible. PMID 19337256. 
  3. ^
  4. ^ Koreckij TD, Trauger RJ, Montgomery RB, Pitts TE, Coleman I, Nguyen H, Reading CL, Nelson PS, Vessella RL, Corey E (2009). "HE3235 inhibits growth of castration-resistant prostate cancer". Neoplasia. 11 (11): 1216–25. PMC 2767223Freely accessible. PMID 19881957. 

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