[Heavy ion tumor therapy].

Heavy ion tumor therapy can reach a millimeter precision everywhere in the body and a greater biological effectiveness in radioresistant tumors compared to the normal tissue. Therefore it is possible to treat mainly resistant or otherwise inoperable tumors with ion beams with great success. In line with the excellent results achieved in a pilot project at GSI several new centers are under construction. In this article, basics of heavy ion tumor therapy are given and the clinical results of the pilot project are described.