[Possibilities and problems in the synchronization therapy of malignant tumours (author's transl)]

New cell kinetic research results promise successful possibilities in conservative tumour therapy. The sensitivity towards radiation and many cytostatic agents is phase dependent so that the possibility must be found to receive a homogenous cell population. Following partial synchronization a cell phase specific tumour therapy can be initiated. We use the synchronized radiation therapy since 4 years. The results in 24 patients treated up to now are not significant. The basic priniciple is clear, but there are still many unsolved problems.