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| Other names | Combretastatin A-4 phosphate; CA4P; CA4PD; fosbretabulin disodium; fosbretabulin tromethamine |
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| Formula | C18H21O8P |
| Molar mass | 396.332 g·mol−1 |
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Fosbretabulin (also known as combretastatin A-4 phosphate or CA4P) is a microtubule destabilizing experimental drug, a type of vascular-targeting agent, a drug designed to damage the vasculature (blood vessels) of cancer tumours causing central necrosis. It is a derivative of combretastatin. It is formulated as the salts fosbretabulin disodium and fosbretabulin tromethamine. [1]
Fosbretabulin is a prodrug. In vivo , it is dephosphorylated to its active metabolite, combretastatin A-4. [2]
In July 2007, the pharmaceutical company OXiGENE initiated a 180-patient phase III clinical trial of fosbretabulin in combination with carboplatin for the treatment of anaplastic thyroid cancer. [3] There is currently no fully FDA approved treatment for this form of cancer. By 2017, it had completed multiple clinical trials (e.g. for solid tumours, [4] non-small cell lung cancer [5] ) with more in progress. [6]