Manfred Georg Krukemeyer first describes magnetic drug targeting, by which is meant the focused application of drugs, e.g. the introduction of a cytostatic, and which is aimed at optimising its locally therapeutic effect. The author thus achieves a high concentration of cytostatic at the site of the tumour. The particles have to be large enough to be attracted by a magnetic field and so find their way into the tumour, where they release their active ingredient. The aim of the hypothesis formed by one of the author s study groups was to show in a scientific experiment that in this case cytostatics coupled with iron particles [Fe3O4] can be introduced into a tumour. The focused introduction of drugs   magnetic drug targeting   results in faster arrival of the active ingredient at the target site together with a reduced quantity of active substances. For this reason magnetic drug targeting is also interesting from an economic point of view.