Patients with primary, high-grade soft tissue sarcoma of the extremities will undergo treatment of their primary tumor with either amputation or limb-sparing surgery and radiotherapy, and then be randomized to either observation or adjuvant treatment with doxorubicin and ifosfamide with mesna (with G-CSF) for five cycles beginning post-operatively. Local recurrence, disease-free survival and overall survival will be evaluated in this randomized two-arm trial.