Catalog No.S2803

Galeterone is a selective CYP17 inhibitor and androgen receptor (AR) antagonist with IC50 of 300 nM and 384 nM, respectively, and is a potent inhibitor of human prostate tumor growth. Phase 2.

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Galeterone Chemical Structure

Galeterone Chemical Structure
Molecular Weight: 388.55

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Product Information

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  • Research Area
  • Inhibition Profile
  • Combination Therapy
    Combination Therapy

Product Description

Biological Activity

Description Galeterone is a selective CYP17 inhibitor and androgen receptor (AR) antagonist with IC50 of 300 nM and 384 nM, respectively, and is a potent inhibitor of human prostate tumor growth. Phase 2.
Targets CYP17 [1] Androgen Receptor [1]
IC50 300 nM 384 nM
In vitro Galeterone is effective at preventing binding of [3H]-R1881 to the mutant LNCaP AR (T877A) with IC50 of 845 nM. Galeterone inhibits the DHT-induced proliferation of LNCaP and LAPC4 cells in a dose-dependent manner with IC50 of 6 μM and 3.2 μM, respectively. [1] Galeterone also inhibits the binding of [3H]-R1881 to the T575A mutant AR in PC3 cells with IC50 of 454 nM. Galeterone potently inhibits the proliferation of LNCaP and LAPC4 cells in the absence of DHT stimulation with IC50 of 2.6 μM and 4 μM, respectively. Furthermore, Galeterone treatment increases the degradation rate of the AR in a dose-dependent manner. [2] Galeterone potently inhibits the growth of the androgen-independent cell lines PC-3 and DU-145 in a dose-dependent manner with GI50 of 7.82 μM and 7.55 μM, respectively. Galeterone induces the endoplasmic reticulum stress response resulting in down-regulation of cyclin D1 protein expression and cyclin E2 mRNA. [3] Galeterone effectively inhibits proliferation of HP-LNCaP and C4-2B cell lines with IC50 of 2.9 μM and 9.7 μM, respectively. Galeterone treatment at 1 μM effectively inhibits androgen receptor activation in LNCaP cells (50%) and HP-LNCaP cells (70%). Galeterone decreases activation of the androgen receptor in both LNCaP cells and HP-LNCaP cells with IC50 of 1 μM and 411 nM, respectively, and down-regulates androgen receptor protein expression by 50% after 24 hour of treatment. [4] Galeterone reduces AR protein and mRNA expression, antagonizes AR-dependent promoter activation induced by androgen, and significantly reduces the phospho-4EBP1 levels. [6]
In vivo Administration of Galeterone at 50 mg/kg twice daily is very effective at inhibiting the growth of androgen-dependent LAPC4 human prostate tumor xenograft, with a 93.8% reduction in the mean final tumor volume compared with controls, and it is also significantly more effective than castration. [1] Treatment of Galeterone (0.13 mM/kg twice daily) or Galeterone (0.13 mmol/kg twice daily) plus castration induces regression of LAPC4 tumor xenografts in SCID mice by 26.55% and 60.67%, respectively. Treatments with Galeterone or Galeterone plus castration causes marked reduction in AR protein of 10- and 5-fold, respectively. [2]

Protocol(Only for Reference)

Kinase Assay:


In vitro assay of CYP17 The in vitro CYP17 inhibitory activity of Galeterone is evaluated using rapid acetic acid releasing assay (AARA), utilizing intact P450c17-expressing E. coli as the enzyme source. It involves the use of [21-3H]-17α-hydroxypregnenolone as the substrate, and CYP17 activity is measured by the amount of tritiated acetic acid formed during the cleavage of the C-21 side chain of the substrate. IC50 value is obtained directly from plots relating percentage inhibition versus inhibitor concentration over appropriate ranges.
AR binding/competition assay Wells in 24-well multiwell dishes are coated with poly-L-lysine (0.05 mg/mL) for 5 minutes, dried, rinsed with sterilized, distilled water and dried for 2 hours. To determine the kinetics of R1881 binding to the wild-type AR, cells are plated in 24-well m

Cell Assay:


Cell lines LNCaP and LAPC4
Concentrations Dissolved in DMSO, final concentrations ~20 μM
Incubation Time 7 days

Cells are seeded in 24 well multi-well plates. Cells are treated with the increasing concentration of Galeterone in steroid free medium with or without 1 nM DHT (LNCaP), or 10 nM DHT (LAPC4) and allowed to grow for 7 days. The number of viable cells is compared by MTT assay (LAPC4) or XTT assay (LNCaP) on the 7th day.

Animal Study:


Animal Models Male severe combined immunodeficient (SCID) mice inoculated subcutaneously (s.c.) with LAPC4 cells
Formulation Prepared at 17.2 mg/mL in a 0.3% solution of hydroxypropyl cellulose in saline
Dosages 50 mg/kg
Administration Injection s.c. twice daily

Conversion of different model animals based on BSA (Value based on data from FDA Draft Guidelines)

SpeciesMouseRatRabbitGuinea pigHamsterDog
Weight (kg)
Body Surface Area (m2)0.0070.0250.
Km factor36128520
Animal A (mg/kg) = Animal B (mg/kg) multiplied by  Animal B Km
Animal A Km

For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.

Rat dose (mg/kg) = mouse dose (22.4 mg/kg) ×  mouse Km(3)  = 11.2 mg/kg
rat Km(6)


[1] Handratta VD, et al. J Med Chem, 2005, 48(8), 2972-2984.

[2] Vasaitis T, et al. Mol Cancer Ther, 2008, 7(8), 2348-2357.

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Clinical Trial Information( data from, updated on 2016-07-30)

NCT Number Recruitment Conditions Sponsor
Start Date Phases
NCT02729376 Completed Healthy Tokai Pharmaceuticals March 2016 Phase 1
NCT02438007 Recruiting Prostate Cancer Tokai Pharmaceuticals June 2015 Phase 3
NCT01709734 Recruiting Prostate Cancer Tokai Pharmaceuticals December 2012 Phase 2
NCT00959959 Completed Prostate Cancer Tokai Pharmaceuticals October 2009 Phase 1

Chemical Information

Download Galeterone SDF
Molecular Weight (MW) 388.55


CAS No. 851983-85-2
Storage 3 years -20℃powder
2 years -80℃in solvent
Synonyms TOK-001
Solubility (25°C) * In vitro Ethanol 40 mg/mL warming (102.94 mM)
DMSO 24 mg/mL (61.76 mM)
Water <1 mg/mL
In vivo 0.5% hydroxyethyl cellulose 30 mg/mL
* <1 mg/ml means slightly soluble or insoluble.
* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.
Chemical Name (3S,10R,13S)-17-(1H-benzo[d]imidazol-1-yl)-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15-dodecahydro-1H-cyclopenta[a]phenanthren-3-ol

Tech Support

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
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