In more than 20 contributions new trends in cancer therapy are reviewed and critically discussed by highly competent authors. Their contributions are based on an international symposium and cover all major fields of clinical oncology. Special emphasis is given to surgical oncology (including photodynamic laser therapy and radiosurgery), radiation oncology, hyperthermia, new antineoplastic agents, enzyme-pattern-targeted chemotherapy, drug resistance, biological response modifiers, bone marrow transplantation, antibody guided therapy, induction of cell differentiation in transformed cells, and the individualization of tumor therapy. The stimulating discussion at the end of each section covering these topics will particulary benefit the clinical oncologist and all researchers devoted to the improvement of cancer therapy.