Due to their high kinetic inertness and consequently reduced side reactions with biomolecules, PtIV complexes are considered to define the future of anticancer platinum drugs. The aqueous stability of a series of biscarboxylato PtIV complexes was studied under physiologically relevant conditions. Unexpectedly and in contrast to the current chemical understanding, especially oxaliplatin and satraplatin complexes underwent fast hydrolysis in equatorial position (even in cell culture medium and serum). Notably, the resulting hydrolysis products strongly differ in their reduction kinetics, a crucial parameter for the activation of PtIV drugs, which also changes the anticancer potential of the compounds in cell culture. The discovery that intact PtIV complexes can hydrolyze at equatorial position contradicts the dogma on the general kinetic inertness of PtIV compounds and needs to be considered in the screening and design for novel platinum-based anticancer drugs.

Department of Chemical Physics and Optics Faculty of Mathematics and Physics Charles University Ke Karlovu 3 12116 Prague 2 Czech Republic

Institute of Cancer Research and Comprehensive Cancer Center Medical University of Vienna Borschkegasse 8a 1090 Vienna Austria

Research Cluster Translational Cancer Therapy Research Vienna Austria

University of Vienna Faculty of Chemistry Institute of Inorganic Chemistry Waehringer Strasse 42 1090 Vienna Austria

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