<p>The article presents the data of experimental and clinical trials of the new therapeutic apparatus "TOP" for the treatment of oncological diseases with no analogue in medical practice. The method is carried out by exposure to a medium radiowave frequency range on a biological organism, with a frequency of the external oscillatory circuit 345 000 ± 15 Hertz. The results of the influence of an electromagnetic field of an average frequency of 350 000 Hertz on laboratory white outbred rats with a positive antitumor effect have been presented. A reliable antitumor effect was obtained when conducting clinical trials on patients with malignant diseases by the influence of radio waves of the medium frequency range of the electromagnetic spectrum. </p>