Testolactone

Testolactone

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Systematic (IUPAC) name
(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
Clinical data
Pregnancy category	US: C (Risk not ruled out)
Routes of administration	Oral
Pharmacokinetic data
Protein binding	~85%
Metabolism	Hepatic
Excretion	Renal
Identifiers
CAS Number	968-93-4
ATC code	none
PubChem	CID 13769
DrugBank	DB00894
Chemical data
Formula	C19H24O3
Molar mass	300.39 g/mol[[]]
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Testolactone, or Teslac (brand name) is an antineoplastic agent that is a derivative of progesterone and is used to treat advanced stage breast cancer.

It is nonselective.

Pharmacology

Testolactone is a synthetic antineoplastic 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

The principal action of testolactone is reported to be inhibition of steroid aromatase activity and the reduction in estrone synthesis that follows. Androstenedione, a 19-carbon steroid hormone produced in the adrenal glands and the gonads, is where estrone synthesis originates and is the source of estrogen in postmenopausal women. In vitro studies report that the aromatase inhibition may be noncompetitive and irreversible, and could possibly account for the persistence of this drug's effect on estrogen synthesis after drug withdrawal.

Uses

This drug is mainly used for treating various types of breast cancer in women who have been through menopause or whose ovaries no longer function. It works by blocking the production of estrogen, which helps prevent the growth of breast cancers that are activated by estrogen. It may also prevent tumor cells from being activated by other hormones.

Side effects

The most common side effects include:

• Abnormal skin sensations
• Aches of the legs and arms
• General body discomfort
• Hair loss
• Loss of appetite
• Nausea
• Redness of the tongue
• Vomiting