OUTLINE: This is a randomized, multicenter study. Patients are stratified according to center, site of primary tumor (extremity vs trunk, including shoulder, pelvic girdle, head, or neck vs central, including intrathoracic, visceral, uterine, or retroperitoneal), size of primary tumor (less than 5 cm vs 5 cm or greater in largest diameter), postoperative radiotherapy (yes vs no), and isolated limb perfusion therapy (yes vs no).