|Systematic (IUPAC) name|
4'-Demethyl-epipodophyllotoxin 9-[4,6-O-(R)-ethylidene-beta-D-glucopyranoside], 4' -(dihydrogen phosphate)
|Bioavailability||Highly variable, 25 to 75%|
|Metabolism||Hepatic (CYP3A4 involved)|
|Biological half-life||Oral: 6 h., IV: 6-12 h., IV in children: 3 h.|
|Excretion||Renal and fecal|
|Molar mass||588.557 g/mol|
|Melting point||243.5 °C (470.3 °F)|
Etoposide is used as a form of chemotherapy for cancers such as Kaposi’s sarcoma, Ewing's sarcoma, lung cancer, testicular cancer, lymphoma, nonlymphocytic leukemia, and glioblastoma multiforme. It is often given in combination with other drugs (such as bleomycin in treating testicular cancer). It is also sometimes used in a conditioning regimen prior to a bone marrow or blood stem cell transplant.
It is given intravenously (IV) or orally in capsule form. If the drug is given IV, it must be done slowly over a 30- to 60-minute period because it can lower blood pressure as it is being administered. Blood pressure is checked often during infusing, with the speed of administration adjusted accordingly.
- low blood pressure
- hair loss
- pain and or burning at the IV site
- constipation or diarrhea
- metallic food taste
- Bone marrow suppression, leading to:
Less common are:
- nausea and vomiting
- allergic-type reactions
- fever, often occurring shortly after IV administration and not due to infection
- mouth sores
- Acute myeloid leukemia (which ironically can be treated with etoposide itself)
Mechanism of action
Etoposide forms a ternary complex with DNA and the topoisomerase II enzyme (which aids in DNA unwinding), prevents re-ligation of the DNA strands, and by doing so causes DNA strands to break. Cancer cells rely on this enzyme more than healthy cells, since they divide more rapidly. Therefore, this causes errors in DNA synthesis and promotes apoptosis of the cancer cell.
Physical and chemical properties
Etoposide is a semisynthetic derivative of podophyllotoxin from the rhizome of the wild mandrake (Podophyllum peltatum). More specifically, it is a glycoside of podophyllotoxin with a D-glucose derivative. It is chemically similar to the anti-cancer drug teniposide, being distinguished only by a methyl rest where teniposide has a thienyl. Both these compounds have been developed with the aim of creating less toxic derivatives of podophyllotoxin.
The substance is a white to yellow-brown, crystalline powder. It is soluble in organic solvents.
The nickname VP-16 likely comes from a compounding of the last name of the chemists who performed early work on the drug (von Wartburg and von Kuhn) and podophyllotoxin. Another scientist who was integral in the development of podophyllotoxin-based chemotherapeutics was the medical pharmacologist Hartmann F. Stähelin.
- "19th WHO Model List of Essential Medicines (April 2015)" (PDF). WHO. April 2015. Retrieved May 10, 2015.
- Hande KR (1998). "Etoposide: four decades of development of a topoisomerase II inhibitor". Eur. J. Cancer 34 (10): 1514–21. doi:10.1016/S0959-8049(98)00228-7. PMID 9893622.
- Longe JL (2002). Gale Encyclopedia Of Cancer: A Guide To Cancer And Its Treatments. Detroit: Thomson Gale. pp. 397–399. ISBN 978-1-4144-0362-5.
- Pommier Y, Leo E, Zhang H, Marchand C (2010). "DNA topoisomerases and their poisoning by anticancer and antibacterial drugs". Chem. Biol. 17 (5): 421–33. doi:10.1016/j.chembiol.2010.04.012. PMID 20534341.
- Gordaliza M, García PA, del Corral JM, Castro MA, Gómez-Zurita MA (2004). "Podophyllotoxin: distribution, sources, applications and new cytotoxic derivatives". Toxicon 44 (4): 441–59. doi:10.1016/j.toxicon.2004.05.008. PMID 15302526.
- Mutschler, Ernst; Schäfer-Korting, Monika (2001). Arzneimittelwirkungen (in German) (8 ed.). Stuttgart: Wissenschaftliche Verlagsgesellschaft. pp. 894–5. ISBN 3-8047-1763-2.
- Dinnendahl, V, Fricke, U, ed. (2015). Arzneistoff-Profile (in German) 4 (28 ed.). Eschborn, Germany: Govi Pharmazeutischer Verlag. ISBN 978-3-7741-9846-3.
- Kuhn M, Von Wartbung A (1967). "Podophyllum- Lignane: Struktur und Absolutkonfiguration von Podorhizol-β-D-glucosid ( = Lignan F). 19. Mitt. über mitosehemmende Naturstoffe ". Helvetica Chimica Acta 50 (6): 1546–65. doi:10.1002/hlca.19670500614.
- Etoposide information at the U.S. National Institutes of Health (archived link, June 5, 2011)