The manifold requirements for interdisciplinary medical care and clinic-related cancer research are provided by the new building for the National Center for Tumor Diseases (NCT) in Heidelberg. These close links allow scientific findings to be quickly put into practice and monitored in the clinic. The booklet shows the form and organization of the new building which promotes the interdisciplinary concept and which is intended to serve as a model for similar facilities in the future. The heart of the new complex is the central atrium. Extending over four stories and flooded with daylight, the atrium is a place of encounter/exchange between medical staff, scientists, patients, and visitors.