SURGERY: Patients undergo amputation or limb salvage surgery in week 11. Tumor tissue is evaluated for histological response to induction therapy. Patients whose tumor is not amenable to macroscopically complete surgical resection undergo radiotherapy and/or other investigational therapy off study. Patients who undergo macroscopically complete surgical resection of the primary tumor or metastases AND who have no disease progression or unacceptable toxicity proceed to maintenance therapy.