In malignant tumors, pathways that control cell growth and cell death are disturbed. In addition, the communication between tumor cells and their environment is altered. For the successful treatment of a tumor by interfering with mechanisms governing malignant growth, the molecular basis of these mechanisms should be understood in detail. The videos on this website intend to serve this goal. Once pathways can be targeted, new therapeutic options for cancer patients may ensue. For a more in-depth understanding, the authors of the videos recommend reading their books "Cancer Signaling", Wiley-VCH (English), and "Molekulare Onkologie" (4th edition, German), Georg Thieme Verlag.