Ontology type: schema:ScholarlyArticle
1980-01
AUTHORSTh. Wagner, D. Heydrich, G. Voelcker, H. J. Hohorst
ABSTRACTBlood levels and urinary excretion of cyclophosphamide and its metabolites were determined in cancer patients receiving cyclophosphamide. Activated cyclophosphamide (4-hydroxycyclophosphamide aldophosphamide) was assayed by TLC after derivatisation to stable 4-(S-benzyl)-sulfido-cyclophosphamide. Twenty minutes after injection of 10(20) mg/kg cyclophosphamide mean peak levels of activated cyclophosphamide were found to be 1.4(2.6) nmol/ml. The rate constant for biotransformation (=activation) of cyclophosphamide in man (km = 0.132 h-1) was only 1/50 of the value found in the mouse whereas the elimination rate constant of activated cyclophosphamide (ke[M] approximately 6.78 h-1) was much higher equalling that of laboratory animals. 4-ketocyclophosphamide, carboxyphosphamide, and phosphoramidemustard reached their peak levels between 4 and 6 h after cyclophosphamide injection. Increasing quantities of cyclophosphamide metabolites were bound to plasma proteins reaching a constant level after 24 h lasted for several days. Fifty per cent of those metabolites were reversibly bound to plasma proteins. Within 24 h, the cumulative excretion of cyclophosphamide and its metabolites amounted to 50% of the dose applied. The main metabolites excreted were phosphoramide-mustard and carboxyphosphamide whereas only 2% consisted of activated cyclophosphamide. The significance of the different pharmacokinetics of cyclophosphamide in laboratory animals and man for the therapeutic index is discussed. More... »
PAGES79-92
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