|Systematic (IUPAC) name|
|Pregnancy cat.||D (US)|
|Legal status||℞-only (US)|
|Half-life||~10 - 25 minutes|
|PDB ligand ID||1PT (, )|
|Mol. mass||397.2858 g/mol|
|(what is this?)|
Oxaliplatin was discovered in 1976 at Nagoya City University by Professor Yoshinori Kidani, who was granted U.S. Patent 4,169,846 in 1979. Oxaliplatin was subsequently in-licensed by Debiopharm and developed as an advanced colorectal cancer treatment. Debio licensed the drug to Sanofi-Aventis in 1994. It gained European approval in 1996 (initially in France) and approval by the U.S. Food and Drug Administration in 2002. Generic oxaliplatin was first approved in the United States in August 2009. In 2010, Sanofi regained exclusivity protection for the drug until August 2012.
Structure and mechanism
The compound features a square planar platinum(II) center. In contrast to cisplatin and carboplatin, oxaliplatin features the bidentate ligand 1,2-diaminocyclohexane in place of the two monodentate ammine ligands. It also features a bidentate oxalate group.
According to in vivo studies, oxaliplatin fights carcinoma of the colon through non-targeted cytotoxic effects. Like other platinum compounds, its cytotoxicity is thought to result from inhibition of DNA synthesis in cells. In particular, oxaliplatin forms both inter- and intra-strand cross links in DNA, which prevent DNA replication and transcription, causing cell death.
Oxaliplatin is used for treatment of colorectal cancer, typically along with folinic acid and 5-fluorouracil in a combination known as FOLFOX. Oxaliplatin has been compared with other platinum compounds used for advanced cancers, such as cisplatin and carboplatin.
Advanced colorectal cancer
In clinical studies, oxaliplatin by itself has modest activity against advanced colorectal cancer. When compared with just 5-fluorouracil and folinic acid administered according to the de Gramont regimen, a FOLFOX4 regime produced no significant increase in overall survival, but did produce an improvement in progression-free survival, the primary end-point of the phase III randomized trial.
Adjuvant treatment of colorectal cancer
After and/or before the curative resection of colorectal cancer, chemotherapy based on 5-fluorouracil and folinic acid reduces the risk of relapse. The benefit is clinically relevant when cancer has spread to locoregional lymph nodes or penetrated through the wall of the rectum or colon (stage III, Dukes C). The addition of oxaliplatin improves relapse-free survival, but data on overall survival have not yet been published in extenso.
When cancer has not spread to the locoregional lymph nodes, nor penetrated through the wall of the rectum or colon (stage II, Dukes B) the benefit of chemotherapy is marginal and the decision on whether to give adjuvant chemotherapy should be carefully evaluated by discussing with the patient the realistic benefits and the possible toxic side effects of treatment. This is even more relevant when the oncologist proposes treatment with oxaliplatin.
Side-effects of oxaliplatin treatment can potentially include:
- Neurotoxicity leading to chemotherapy-induced peripheral neuropathy, a progressive, enduring and often irreversible tingling numbness, intense pain and hypersensitivity to cold, beginning in the hands and feet and sometimes involving the arms and legs, often with deficits in proprioception.
- Nausea, vomiting, or diarrhea
- Neutropenia (low number of a type of white blood cells)
- Ototoxicity (hearing loss)
- Extravasation if oxaliplatin leaks from the infusion vein it may cause severe damage to the connective tissues.
- Hypokalemia (low blood potassium), which is more common in women than men
Eloxatin is covered by patent numbers 5338874 (Expiry Apr 07,2013), 5420319 (Expiry Aug 08,2016), 5716988 (Expiry Aug 07,2015) and 5290961 (Expiry Jan 12, 2013) (see Electronic Orange Book patent info for Eloxatin). Exclusivity code I-441, which expired on Nov 04, 2007, is for use combination with infusional 5-FU/LV for adjuvant treatment stage III colon cancer patients who have undergone complete resection primary tumor-based on improvement in disease free survival with no demonstrated benefit overall survival after 4 years. Exclusivity code NCE, New Chemical Entity, expired on Aug 09, 2007.
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- National Cancer Institute, Rectal Cancer Treatment (PDQ®)
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- Chay WY, Chew L, Yeoh TT, Tan MH (May 2010). "An association between transient hypokalemia and severe acute oxaliplatin-related toxicity predominantly in women". Acta Oncol 49 (4): 515–7. doi:10.3109/02841860903464015. PMID 20092386.
- Orange Book. accessdata.fda.gov. URL: http://www.accessdata.fda.gov/scripts/cder/ob/docs/patexclnew.cfm?Appl_No=021759&Product_No=001&table1=OB_Rx. Accessed on: July 22, 2007.
- Oxaliplatin - Official web site of manufacturer.
- Oxaliplatin Prescribing Information - Official prescribing information.
- NCI Drug Information Summary on Oxaliplatin
- Graham J, Mushin M, Kirkpatrick P (2004). "Oxaliplatin" (PDF). Nat Rev Drug Discov 3 (1): 11–2. doi:10.1038/nrd1287. PMID 14756144.