World Sarcoma Network (WSN) is a cooperative group gathering the main reference centres for sarcomas around the World dedicated to the development and the support of innovative and collaborative clinical trials and to the drug development in Sarcomas.

The Connective Tissue Oncology Society (CTOS) was formed in 1995 and incorporated in 1997. CTOS is an international group comprised of physicians and scientists with a primary interest in the tumors of connective tissues. The goal of the society is to advance the care of patients with connective tissue tumors and to increase knowledge of all aspects of the biology of these tumors, including basic and clinical research.