The aims of the “European Musculo-Skeletal Oncology Society” (E.M.S.O.S.) are to advance the science and practice of the diagnosis and treatment of bone and soft tissue tumours, to promote basic and clinical research, and to disseminate knowledge in order to provide a common high standard of musculo-skeletal oncology. The particular purpose of the Association is to promote mutual collaboration between different specialists and institutes involved in the treatment of musculo-skeletal tumours.