The invention relates to the use deuterium depleted water (DDW) for the preparation of combined pharmaceutical compositions for the prevention or treatment of tumorous diseases, where the composition comprises DDW with deuterium content of 0.01 to 135 ppm and one or more antineoplastic agent(s), optionally together with one or more usual pharmaceutical auxiliary material(s). Further, the invention relates to pharmaceutical compositions for adjuvant treatment of tumorous diseases, where the composition comprises DDW with deuterium content of 0.01 to 135 ppm and one or more antineoplastic agent(s), optionally together with one or more usual pharmaceutical auxiliary material(s). The invention also relates to aqueous pharmaceutical compositions usually applied in curing where the aqueous component is DDW with deuterium content of 0.01 to 135 ppm.
