Abstract: What is disclosed is the use of dissociable heterocycle compounds from the group including aminoacridine, aminocholine and aminopyridine as well as their derivatives substituted on the basic structure, which are present in tautomeric diimine form, for the selective iontophoretic treatment or for production of a pharmaceutical for iontophoretic treatment and relapse prophylaxis of bladder cancer as well as for iontophoretic treatment of malignant skin and mucus membrane tumors.It is further disclosed and proven that the antineoplastic effect observed with use of the above compositions in animal experiments and in clinical treatment is selective and healthy tissue is not damaged.The common denominator for the characteristic and proven antineoplastic selective effect of the three classes of materials is the tautomeric diimine form.