This is a randomized Phase III trial comparing two treatment regimens in patients with unresectable soft tissue sarcoma. The failure rates observed on both treatment arms (failure defined as progression or death) will be compared to determine which regimen results in the lowest failure rate (Primary objective). As a secondary endpoint, the percentage of patients who are failure-free (failure defined as progression or death) at 3 months and 6 months will be compared between the two arms (Secondary objective).