Plasma-levels of Doxorubicin After Iv Bolus Injection and Infusion of the Doxorubicin-dna Complex in Rabbits and Man - Comparison With Free Doxorubicin

When injected rapidly IV into rabbits, the plasma levels of free DOX decreased biphasically and the drug was distributed in a volume greater than the body volume. When given as a DNA complex, the area under the concentration versus time curve was increased 10-fold and the distribution volume reduced more than 100-fold. The DOX-DNA complex infused both in rabbits and in human patients reached steady state-concentrations 10 and 20 times higher, respectively, than free DOX infusion, and the distribution volumes were reduced accordingly. These results confirm that the observed lower cardiotoxicity of the DOX-DNA complex arises despite higher plasma concentrations of the drug.