Identification

Summary

Testolactone is a medication used to treat advanced breast cancer.

Generic Name
Testolactone
DrugBank Accession Number
DB00894
Background

An antineoplastic agent that is a derivative of progesterone and used to treat advanced breast cancer.

Type
Small Molecule
Groups
Approved, Investigational
Structure
Thumb
Weight
Average: 300.3921
Monoisotopic: 300.172544634
Chemical Formula
C19H24O3
Synonyms
  • (4aS,4bR,10aR,10bS,12aS)-10a,12a-dimethyl-3,4,4a,5,6,10a,10b,11,12,12a-decahydro-2H-naphtho[2,1-f]chromene-2,8(4bH)-dione
  • 1-dehydrotestololactone
  • 1,2-didehydrotestololactone
  • 13-hydroxy-3-oxo-13,17-secoandrosta-1,4-dien-17-oic acid δ-lactone
  • D-homo-17a-oxaandrosta-1,4-diene-3,17-dione
  • delta(1)-testololactone
  • Testolactona
  • Testolactone
  • Testolactonum
  • Testolattone
  • Δ1-testololactone
External IDs
  • NSC-23759
  • SQ 9538
  • SQ-9538

Pharmacology

Indication

For palliative treatment of advanced breast cancer in postmenopausal women.

Pharmacology
Reduce drug development failure rates
Build, train, & validate machine-learning models
with evidence-based and structured datasets.
See how
Build, train, & validate predictive machine-learning models with structured datasets.
See how
Contraindications & Blackbox Warnings
Contraindications
Avoid life-threatening adverse drug events
Improve clinical decision support with information on contraindications & blackbox warnings, population restrictions, harmful risks, & more.
Learn more
Avoid life-threatening adverse drug events & improve clinical decision support.
Learn more
Pharmacodynamics

Testolactone is a synthetic anti-neoplastic agent that is structurally distinct from the androgen steroid nucleus in possessing a six-membered lactone ring in place of the usual five-membered carbocyclic D-ring. Despite some similarity to testosterone, testolactone has no in vivo androgenic effect. No other hormonal effects have been reported in clinical studies in patients receiving testolactone.

Mechanism of action

Although the precise mechanism by which testolactone produces its clinical antineoplastic effects has not been established, its principal action is reported to be inhibition of steroid aromatase activity and consequent reduction in estrone synthesis from adrenal androstenedione, the major source of estrogen in postmenopausal women. Based on in vitro studies, the aromatase inhibition may be noncompetitive and irreversible. This phenomenon may account for the persistence of testolactone's effect on estrogen synthesis after drug withdrawal.

TargetActionsOrganism
ACytochrome P450 19A1
inhibitor
Humans
Absorption

Testolactone is well absorbed from the gastrointestinal tract.

Volume of distribution

Not Available

Protein binding

~85%

Metabolism

Hepatic. Metabolized to several derivatives in the liver, all of which preserve the lactone D-ring.

Route of elimination

No clinical effects in humans of testolactone on adrenal function have been reported; however, one study noted an increase in urinary excretion of 17-ketosteroids in most of the patients treated with 150 mg/day orally. It is metabolized to several derivatives in the liver, all of which preserve the lactone D-ring. These metabolites, as well as some unmetabolized drug, are excreted in the urine.

Half-life

Not Available

Clearance

Not Available

Adverse Effects
Adverseeffects
Improve decision support & research outcomes
With structured adverse effects data, including: blackbox warnings, adverse reactions, warning & precautions, & incidence rates.
Learn more
Improve decision support & research outcomes with our structured adverse effects data.
Learn more
Toxicity

Oral LD50s in mouse and dog are 1630 mg/kg and 593-926 mg/kg, respectively.

Pathways
Not Available
Pharmacogenomic Effects/ADRs
Not Available

Interactions

Drug Interactions
This information should not be interpreted without the help of a healthcare provider. If you believe you are experiencing an interaction, contact a healthcare provider immediately. The absence of an interaction does not necessarily mean no interactions exist.
DrugInteraction
AbacavirTestolactone may decrease the excretion rate of Abacavir which could result in a higher serum level.
AceclofenacAceclofenac may decrease the excretion rate of Testolactone which could result in a higher serum level.
AcemetacinAcemetacin may decrease the excretion rate of Testolactone which could result in a higher serum level.
AcetaminophenAcetaminophen may decrease the excretion rate of Testolactone which could result in a higher serum level.
AcetazolamideAcetazolamide may increase the excretion rate of Testolactone which could result in a lower serum level and potentially a reduction in efficacy.
Acetylsalicylic acidAcetylsalicylic acid may decrease the excretion rate of Testolactone which could result in a higher serum level.
AclidiniumTestolactone may decrease the excretion rate of Aclidinium which could result in a higher serum level.
AcrivastineTestolactone may decrease the excretion rate of Acrivastine which could result in a higher serum level.
AcyclovirAcyclovir may decrease the excretion rate of Testolactone which could result in a higher serum level.
Adefovir dipivoxilAdefovir dipivoxil may decrease the excretion rate of Testolactone which could result in a higher serum level.
Interactions
Identify potential medication risks
Easily compare up to 40 drugs with our drug interaction checker.
Get severity rating, description, and management advice.
Learn more
Food Interactions
Not Available

Products

Products2
Drug product information from 10+ global regions
Our datasets provide approved product information including:
dosage, form, labeller, route of administration, and marketing period.
Access now
Access drug product information from over 10 global regions.
Access now
International/Other Brands
Fludestrin (Bristol-Myers Squibb)
Brand Name Prescription Products
NameDosageStrengthRouteLabellerMarketing StartMarketing EndRegionImage
TeslacTablet50 mg/1OralE.R. Squibb & Sons, L.L.C.2009-06-012010-04-30US flag

Categories

Drug Categories
Chemical TaxonomyProvided by Classyfire
Description
This compound belongs to the class of organic compounds known as naphthopyrans. These are compounds containing a pyran ring fused to a naphthalene moiety. Furan is a 6 membered-ring non-aromatic ring with five carbon and one oxygen atoms. Naphthalene is a polycyclic aromatic hydrocarbon made up of two fused benzene rings.
Kingdom
Organic compounds
Super Class
Organoheterocyclic compounds
Class
Naphthopyrans
Sub Class
Not Available
Direct Parent
Naphthopyrans
Alternative Parents
Naphthalenes / Delta valerolactones / Pyrans / Oxanes / Cyclic ketones / Carboxylic acid esters / Oxacyclic compounds / Monocarboxylic acids and derivatives / Organic oxides / Hydrocarbon derivatives
Substituents
Aliphatic heteropolycyclic compound / Carbonyl group / Carboxylic acid derivative / Carboxylic acid ester / Cyclic ketone / Delta valerolactone / Delta_valerolactone / Hydrocarbon derivative / Ketone / Lactone
Molecular Framework
Aliphatic heteropolycyclic compounds
External Descriptors
3-oxo-Delta(1),Delta(4)-steroid, seco-androstane (CHEBI:9460) / Androstane and derivatives (C02197) / C19 steroids (androgens) and derivatives (LMST02020084)
Affected organisms
  • Humans and other mammals

Chemical Identifiers

UNII
6J9BLA949Q
CAS number
968-93-4
InChI Key
BPEWUONYVDABNZ-DZBHQSCQSA-N
InChI
InChI=1S/C19H24O3/c1-18-9-7-13(20)11-12(18)3-4-14-15(18)8-10-19(2)16(14)5-6-17(21)22-19/h7,9,11,14-16H,3-6,8,10H2,1-2H3/t14-,15+,16+,18+,19+/m1/s1
IUPAC Name
(1R,2S,7S,10S,11R)-7,11-dimethyl-6-oxatetracyclo[8.8.0.0²,⁷.0¹¹,¹⁶]octadeca-12,15-diene-5,14-dione
SMILES
[H][C@@]12CCC3=CC(=O)C=C[C@]3(C)[C@@]1([H])CC[C@]1(C)OC(=O)CC[C@@]21[H]

References

Synthesis Reference

Ivan Gilbert, Michael White, "Fermentation method for the preparation of testolactone by fusarium species." U.S. Patent US20060292666, issued December 28, 2006.

US20060292666
General References
Not Available
Human Metabolome Database
HMDB0015031
KEGG Drug
D00153
KEGG Compound
C02197
PubChem Compound
13769
PubChem Substance
46508076
ChemSpider
13172
BindingDB
50367848
RxNav
10378
ChEBI
9460
ChEMBL
CHEMBL1571
ZINC
ZINC000004081771
Therapeutic Targets Database
DAP000624
PharmGKB
PA164743056
RxList
RxList Drug Page
Drugs.com
Drugs.com Drug Page
Wikipedia
Testolactone
FDA label
Download (105 KB)
MSDS
Download (58.6 KB)

Clinical Trials

Clinical Trials
PhaseStatusPurposeConditionsCount
4CompletedBasic ScienceTranssexualism1
2CompletedTreatmentFibrous Dysplasia, Polyostotic / Puberty, Precocious1
2CompletedTreatmentPuberty, Precocious1

Pharmacoeconomics

Manufacturers
  • Bristol myers squibb
  • Bristol myers squibb co
Packagers
  • B&B Pharmaceuticals
  • Bristol-Myers Squibb Co.
  • E.R. Squibb and Sons LLC
Dosage Forms
FormRouteStrength
TabletOral50 mg/1
Prices
Not Available
Patents
Not Available

Properties

State
Solid
Experimental Properties
PropertyValueSource
melting point (°C)218.5 °CPhysProp
water solubilitySlightly soluble (27.4 mg/L)Not Available
logP3.7Not Available
Predicted Properties
PropertyValueSource
Water Solubility0.023 mg/mLALOGPS
logP2.33ALOGPS
logP3.23ChemAxon
logS-4.1ALOGPS
pKa (Strongest Acidic)18.84ChemAxon
pKa (Strongest Basic)-5ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count2ChemAxon
Hydrogen Donor Count0ChemAxon
Polar Surface Area43.37 Å2ChemAxon
Rotatable Bond Count0ChemAxon
Refractivity85.79 m3·mol-1ChemAxon
Polarizability33.42 Å3ChemAxon
Number of Rings4ChemAxon
Bioavailability1ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleNoChemAxon
MDDR-like RuleNoChemAxon
Predicted ADMET Features
PropertyValueProbability
Human Intestinal Absorption+0.9945
Blood Brain Barrier+0.9379
Caco-2 permeable+0.7355
P-glycoprotein substrateSubstrate0.6792
P-glycoprotein inhibitor IInhibitor0.6476
P-glycoprotein inhibitor IINon-inhibitor0.6498
Renal organic cation transporterNon-inhibitor0.7565
CYP450 2C9 substrateNon-substrate0.8542
CYP450 2D6 substrateNon-substrate0.9116
CYP450 3A4 substrateSubstrate0.6459
CYP450 1A2 substrateNon-inhibitor0.7315
CYP450 2C9 inhibitorNon-inhibitor0.8996
CYP450 2D6 inhibitorNon-inhibitor0.9177
CYP450 2C19 inhibitorNon-inhibitor0.8484
CYP450 3A4 inhibitorNon-inhibitor0.7612
CYP450 inhibitory promiscuityLow CYP Inhibitory Promiscuity0.9224
Ames testNon AMES toxic0.9515
CarcinogenicityNon-carcinogens0.9515
BiodegradationNot ready biodegradable0.9096
Rat acute toxicity1.7356 LD50, mol/kg Not applicable
hERG inhibition (predictor I)Weak inhibitor0.8719
hERG inhibition (predictor II)Non-inhibitor0.8734
ADMET data is predicted using admetSAR, a free tool for evaluating chemical ADMET properties. (23092397)

Spectra

Mass Spec (NIST)
Not Available
Spectra
SpectrumSpectrum TypeSplash Key
Predicted GC-MS Spectrum - GC-MSPredicted GC-MSNot Available
Predicted MS/MS Spectrum - 10V, Positive (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 20V, Positive (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 40V, Positive (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 10V, Negative (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 20V, Negative (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 40V, Negative (Annotated)Predicted LC-MS/MSNot Available

Targets

Drugtargets2
Build, predict & validate machine-learning models
Use our structured and evidence-based datasets to unlock new
insights and accelerate drug research.
Learn more
Use our structured and evidence-based datasets to unlock new insights and accelerate drug research.
Learn more
Details
1. Cytochrome P450 19A1
Kind
Protein
Organism
Humans
Pharmacological action
Yes
Actions
Inhibitor
General Function
Oxygen binding
Specific Function
Catalyzes the formation of aromatic C18 estrogens from C19 androgens.
Gene Name
CYP19A1
Uniprot ID
P11511
Uniprot Name
Aromatase
Molecular Weight
57882.48 Da
References
  1. Chen X, Ji ZL, Chen YZ: TTD: Therapeutic Target Database. Nucleic Acids Res. 2002 Jan 1;30(1):412-5. [Article]
  2. Raman JD, Schlegel PN: Aromatase inhibitors for male infertility. J Urol. 2002 Feb;167(2 Pt 1):624-9. [Article]
  3. Herzog AG, Klein P, Jacobs AR: Testosterone versus testosterone and testolactone in treating reproductive and sexual dysfunction in men with epilepsy and hypogonadism. Neurology. 1998 Mar;50(3):782-4. [Article]
  4. Dunkel L: Use of aromatase inhibitors to increase final height. Mol Cell Endocrinol. 2006 Jul 25;254-255:207-16. [Article]
  5. Cepa MM, Tavares da Silva EJ, Correia-da-Silva G, Roleira FM, Teixeira NA: Structure-activity relationships of new A,D-ring modified steroids as aromatase inhibitors: design, synthesis, and biological activity evaluation. J Med Chem. 2005 Oct 6;48(20):6379-85. [Article]

Drug created at June 13, 2005 13:24 / Updated at April 03, 2021 09:40