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Carboplatin is a chemotherapy drug used against some forms of cancer. It was introduced in the late 1980s and has since gained popularity in clinical treatment due to its vastly reduced side-effects compared to its parent compound cisplatin. Cisplatin and carboplatin, as well as oxaliplatin, are classified as DNA alkylating agents. Image File history File links Carboplatin drawn in OpenOffice. ...
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Cisplatin or cis-diamminedichloroplatinum(II) (CDDP) is a platinum-based chemotherapy drug used to treat various types of cancers, including sarcomas, some carcinomas (e. ...
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Alkylating agents are so named because of their ability to add alkyl groups to many electronegative groups under conditions present in cells. ...
History
Bristol-Myers Squibb gained Food and Drug Administration (FDA) approval for carboplatin, under the brand name Paraplatin, in March 1989. The drug went generic in October 2004. There are also generic versions of the drug available from APP, Bedford, Sicor, Mayne Pharma, Pharmachemie, Pliva, Sandoz, Spectrum. Bristol-Myers Squibb (NYSE: BMY), colloquially referred to as BMS, is a pharmaceutical corporation, formed by a 1989 merger between pharmaceutical companies Bristol-Myers Company and Squibb Corporation. ...
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Pharmacology
Chemistry Carboplatin differs from cisplatin in that it has a closed cyclobutane dicarboxylate (CBDCA) moiety on its leaving arm in contrast to the readily leaving chloro groups. This results in very different DNA binding kinetics, though it forms the same reaction products in vitro at equivalent doses with cisplatin. However, recent studies provide a new caveat on the DNA binding molecular mechanisms with the possibility of being activated by nucleophiles (as opposed to cisplatin), before forming the toxic adducts. There are also results to show that cisplatin and carboplatin cause different morphological changes in MCF-7 cell lines while exerting their cytotoxic behaviour.
Mode of action Two theories exist to explain the molecular mechanism of action of carboplatin with DNA. Wikipedia does not yet have an article with this exact name. ...
- Aquation, or the like-cisplatin hypothesis.
- Activation, or the unlike-cisplatin hypothesis.
The former is more accepted owing to the similarity of the leaving groups with its predecessor cisplatin, while the latter hypothesis envisages a biologically activation mechanism to release the active Pt2+ species.
Side-effects The largest benefit of using carboplatin over cisplatin is the reduction of side effects; particularly the elimination of cisplatin's nephrotoxic effects. This is due in part to the added stability of carboplatin in the bloodstream, which prevents proteins from binding to it. This in turn reduces the amount of these protein-carboplatin complexes to be excreted. The lower excretion rate of carboplatin means that more is retained in the body, and hence its effects are longer lasting (a retention half-life of 30 hours for carboplatin, compared to 1.5-3.6 hours in the case of cisplatin). Nephrotoxicity is a poisonous effect of some substances, both toxins and medication, on the kidney. ...
There are no known ototoxic effects from carboplatin. Nausea and vomiting are less severe and more easily controlled, compared to the incessant vomiting and antiperistalsis that some patients using cisplatin may experience. Carboplatin has also proven effective in some strains of cancer that may not be susceptible to cisplatin, including germ-line cell, small and non-small cell lung, ovary, and bladder cancers, as well as acute leukemia. Ototoxicity is damage of the ear (oto), specifically the cochlea or auditory nerve and sometimes the vestibulum, by a toxin (often medication). ...
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Leukemia or leukaemia (see spelling differences) is a cancer of the blood or bone marrow characterized by an abnormal proliferation of blood cells, usually white blood cells (leukocytes). ...
The main drawback of carboplatin is its myelosuppressive effects. This causes the blood cell and platelet output of bone marrow in the body to decrease quite dramatically, sometimes as low as 10% of its usual production levels. The nadir of this myelosuppression usually occurs 21-28 days after the first treatment, after which the blood cell and platelet levels in the blood begin to stabilize, often coming close to its pre-carboplatin levels. This decrease in white blood cells (neutropenia) causes many complications, most notably infection by opportunistic organisms. This necessitates readmission to hospital and treatment with antibiotics. Human blood smear: a - erythrocytes; b - neutrophil; c - eosinophil; d - lymphocyte. ...
Cells in culture, stained for keratin (red) and DNA (green). ...
A 250 ml bag of newly collected platelets. ...
Bone marrow suppression is a serious side effect of chemotherapy and certain drugs affecting the immune system such as azathioprine. ...
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The potency of carboplatin is also something to be desired compared to cisplatin. Depending on which strain of cancer, carboplatin can be over 8 to 45 times less effective compared to cisplatin. The clinical standard of dosage of carboplatin is usually a 4:1 ratio compared to cisplatin; that is, for a dose that usually requires a particular dose of cisplatin, four times more carboplatin is needed to achieve the same effectiveness. The stable property of carboplatin is a mixed blessing: although once uptake of the drug occurs, its retention half-life is considerably longer than cisplatin, it is also due to this inertness that causes carboplatin to go right through the human body, and up to 90% of the carboplatin given can be recovered in urine.
Recent studies have provided a way to increase the effectiveness of carboplatin by first incubating carboplatin in a sodium chloride (NaCl) solution. After 24 hours, an analysis was performed on the solution by separating the compounds by thin-layer chromatography (TLC). The TLC isolated cisplatin, carboplatin, and several platinum bi-products in the solution. Numerous trials were done, and the trend showed that the survival rate of E. coli dropped dramatically as the molarity of the NaCl incubating solution increased. The treated E. coli also showed decreased amounts of alkaline phosphatase, a protein indicator of cellular size. This suggests that as this incubated carboplatin solution was administered to cells, they began to shrink and eventually die; apparently by the same mechanism that cisplatin works. Sodium chloride, also known as common salt, table salt, or halite, is a chemical compound with the formula NaCl. ...
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Binomial name Escherichia coli T. Escherich, 1885 Escherichia coli (usually abbreviated to E. coli) is one of the main species of bacteria that live in the lower intestines of warm-blooded animals (including birds and mammals) and are necessary for the proper digestion of food. ...
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Current events A recent study in mutant mice suggests that in the subset of women with breast cancer due to BRCA1 and BRCA2 genes ( these cause a variety of familial breast cancer ) carboplatin may be more effective than the usual breast cancer medications. However, human data on this application is awaited.
External links - Medline Plus carboplatin page
- Relevant literature
- Natarajan, G., et al., Increased DNA-binding activity of carboplatin in the presence of nucleophiles and human breast cancer MCF-7 cell cytoplasmic extracts: activation theory revisited. Biochem. Pharmacol. 58, 1625-1629 (1999). PMID 10535754.
- Knox, RJ et al., Mechanism of cytotoxicity of anticancer platinum drugs: evidence that cis-diamminedichloroplatinum(II) and cis-diammine-(1,1-cyclobutanedicarboxylato)platinum(II) differ only in the kinetics of their interaction with DNA., Cancer Res. 1986 Apr;46(4 Pt 2):1972-9. PMID 3512077
- Canetta R, Rozencweig M, Carter SK., Carboplatin: the clinical spectrum to date., Cancer Cancer Treat Rev. 1985 Sep;12 Suppl A:125-36. PMID 3002623
- Overbeck, T, et. al. “A comparison of the genotoxic effects of carboplatin and cisplatin in Escherichia Coli”. Mutation Research/DNA Repair. Volume: 362, Issue: 3, April 2, 1996, pp. 249-259
- Schnurr, B., Gust, Ronald. “Investigations on the decomposition of carboplatin in infusion solutions”. Mikrochimica Acta. Volume: 140, Issue: 1-2, August, 2002, pp. 69 – 76
- Xiang, Wang. "Structural studies of atom-specific actions on DNA". Pharmacology & Therapeutics. Volume: 83, Issue: 3, September, 1999, pp. 181-215
For a full list of external links, MSDSs, and suppliers of chemical compounds, see Wikipedia:Chemical sources. This page meets Wikipedias criteria for speedy deletion. ...
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