Abstract
Osteosarcoma is the most common primary malignant tumor of bone (annual incidence: 2 - 3/Mio). Ever since 25 years ago, affected children, adolescents, and adults from Germany, Austria, and Switzerland receive their therapy within trials of the Cooperative Osteosarcoma Study Group (COSS). Approximately 60 % of all patients ever entered into COSS-trials could be cured with an interdisciplinary treatment approach consisting of complete surgical removal of the primary tumor plus intensive pre- and postoperative chemotherapy. The COSS-group's database now includes information on more than 3,000 osteosarcoma patients treated with such a multimodal approach, the largest series worldwide. The present paper is intended to detail the experience gathered from this cohort.
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