- No history, within the past five years, of malignancies other than soft tissue sarcoma (except: basal or squamous cell carcinoma of the skin, in situ carcinoma of the cervix, resected incidental prostate cancer staged pT2 with Gleason Score 6 and postoperative PSA < 0.5 ng/ml). Patients with any history of malignancies who are disease-free for more than 5 years are eligible.