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The ability of three nitroimidazoles [SR-2508, misonidazole (MISO), and benznidazole] with differing octanol-water partition coefficients to enhance the cytotoxicity of the nitrosourea 1-(2-chloroethyl)-3-cyclohexyl-1-nitrosourea (CCNU) was evaluated in two mouse tumors (the KHT sarcoma and the SCC VII/St carcinoma). These results were compared with the(More)
Enhancement of CCNU cytotoxicity by misonidazole (MISO) was studied in three tumours and two normal tissues in the mouse. The 3 experimental tumours (SCCVII/St, EMT6 and KHT) showed very different sensitivities to CCNU alone, but MISO enhanced the cell killing in ech case. The effect was not always dose-modifying, so that the CCNU dose range for the(More)
Binding of misonidazole (MISO) or a derivative to hypoxic cells in tumors has been proposed as a method for identifying tumors and measuring their level of hypoxia. We have recently shown that the hypoxic fraction of tumor cells can be altered over a wide range in vivo by acutely changing the hematocrit of the host animal by transfusion. The present study(More)
The ability of a range of 2-nitroimidazoles with similar electron affinities but widely differing partition coefficients (P) to enhance the cytotoxicity of cyclophosphamide (CY) in mouse tumour and normal tissues was investigated. In a preliminary study large single doses of benznidazole (BENZ), misonidazole (MISO), desmethylmisonidazole (DMM), and SR-2508(More)
The nitroimidazole SR-2508 is currently being tested clinically as a radiosensitizer. Its relatively low toxicity allows it to be used at higher doses than misonidazole so that its potential as a chemosensitizer is also of considerable interest. Multiple injections of SR-2508 were given to SCC VII/St tumor-bearing mice to achieve a clinically realistic(More)
Hypoxic cells in human tumours probably contribute to the failure of radiotherapy in some sites. Changes in the oxygen carrying capacity of the blood, such as in anaemia, have been shown to influence tumour response. The effect of acute and chronic changes in haematocrit on the radiosensitivity of three mouse tumours (EMT6, KHT and RIF-1) were studied.(More)
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