DISEASE CHARACTERISTICS: Histologically or cytologically confirmed recurrent, metastatic, or locally advanced soft tissue sarcoma considered incurable by surgery or radiotherapy Bidimensionally measurable disease At least 1 cm x 1 cm, with clearly defined margins on CT scan, X-ray, or physical examination Located outside of radiation port or evidence of progression within radiation port No CNS disease only No uncontrolled symptomatic brain metastases regardless of other disease sites