This is an open-label (patients will know the names of the study drugs they receive), randomized (patients will be assigned by chance to receive 1 of 2 treatment schedules with trabectidin) study designed to examine the the survival, safety, and pharmacokinetics (blood levels) trabectedin when administered to patients with 2 types of cancer (Liposarcoma or Leiomyosarcoma) who have received treatment with other anti-cancer therapy (Anthracycline and/or Ifosfamide). Trabectedin (also referred to as Yondelis) is a drug being developed to treat patients with cancer. Yondelis will be administered intravenously (i.v.) via a central catheter (tube) into a central vein once a week (0.58 mg/m2 as a 3-hour infusion on Days 1, 8, and 15 of each 28-day treatment cycle) or once every 3 weeks (1.5 mg/m2 administered as a 24-hour infusion on Day 1 of every 21-day treatment cycle) until disease progression. Patients in each arm will be pretreated with 20 mg of dexamethasone i.v. 30 minutes prior to each infusion.
The purpose of this study is to test the safety and effectiveness of an investigational chemotherapy agent in patients with types of advanced cancer referred to as liposarcoma or leiomyosarcoma.