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  H824    AKSci Reference Standard
Exemestane
, 98% (HPLC)
 
6-Methyleneandrosta-1,4-diene-3,17-dione




IDENTITY
CAS Number:107868-30-4
MDL Number:MFCD00866994
MF:C20H24O2
MW:296.4
SPECIFICATIONS & PROPERTIES
Min. Purity Spec:98% (HPLC)
Physical Form (at 20°C):Solid
Melting Point:192-202°C
Optical Rotation:+250° - +300° (c=1, MeOH)
Long-Term Storage:Store long-term at -20°C
DOT/IATA TRANSPORT INFORMATION
Not hazardous material

BIOLOGICAL INFO
Solubility:DMSO: >=20mg/mL; H2O: <1mg/mL; EtOH: 15mg/mL
Application(s):Aromatase inhibitor
Form:Free Base

REVIEW

 Exemestane is an irreversible (Type 1), steroidal aromatase inhibitor. Aromatase catalyzes the final and rate-limiting step in the conversion of androgens to estrogens in peripheral tissues. This occurs mainly in adipose tissue, but also in normal and malignant breast tissues, and provides the main source of estrogen in postmenopausal women. The goal of hormone therapy in breast cancer is to deprive tumour cells of estrogens, which are implicated in the development or progression of tumours. Maximal estrogen suppression is produced by a 25 mg dose. It occurs after 2-3 days and returns to baseline in 10-14 days. Exemestane does not have estrogenic activity. Highly selective blockade of aromatase does not interfere with the production of other steroids (eg, adrenal corticosteroids1, aldosterone2, androgens). Evidence suggests that tumour progression is not due to a loss of estrogen suppression but to newly developed tumour resistance, including acquired hypersensitivity of some tumour cells to estrogens. Differences in the mechanism of action may contribute to the apparent lack of cross-resistance between steroidal (eg, exemestane) and nonsteroidal (eg, anastrozole, letrozole) aromatase inhibitors.

REFERENCES
[1]Njar VC, Brodie AM. Comprehensive pharmacology and clinical efficacy of aromatase inhibitors. Drugs 1999;58(2):233-55.
[2] Pharmacia & Upjohn Inc. Aromasin product monograph. Mississauga; 10 August 2000.
[3] Kvinnsland S, Anker G, Dirix LY, et al. High activity and tolerability demonstrated for exemestane in postmenopausal women with metastatic breast cancer who had previously failed on tamoxifen treatment. European Journal of Cancer 2000;36(8):976-82.
[4] Pharmacia & Upjohn Inc. New drug submission, part 3 - comprehensive summary. Mississauga: Ontario; 2000.

GLOBALLY HARMONIZED SYSTEM (GHS)

Pictograms

Signal Word
Danger

Hazard Statements
H360; H411

Precautionary Statements
P201; P202; P273; P281; P308+P313; P391; P405; P501


Current as of December 23, 2024

AKSci Reference Standards are high-purity, low-impurity compounds suitable for use as standards.


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All products are for research and development use only, not for any other uses, and must be handled by technically-qualified persons.

These products are explicitly not intended to be used in foods and/or cosmetics and/or drugs (human and veterinary) and/or consumer products and/or biocides and/or pesticides of any kind unless explicitly stated otherwise.

Products are not sold to individuals. We do not ship to residential addresses. Consumer orders will be cancelled without notice.

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CATEGORIES

 APIs and Bioactives > Aromatose inhibitors


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