Ecteinascidin 743 in Treating Patients With Advanced Soft Tissue Sarcoma

DISEASE CHARACTERISTICS: Histologically proven soft tissue sarcoma, including the following cell types: Malignant fibrous histiocytoma Liposarcoma Rhabdomyosarcoma Synovial sarcoma Malignant paraganglioma Fibrosarcoma Leiomyosarcoma Angiosarcoma including hemangiopericytoma Neurogenic sarcoma Unclassified sarcoma Miscellaneous sarcoma including mixed mesodermal tumors of the uterus Cell types NOT allowed: Malignant mesothelioma Chondrosarcoma Neuroblastoma Osteosarcoma Ewing's sarcoma Embryonal rhabdomyosarcoma Measurable lesion with evidence of progression within 6 weeks prior to study (osseous lesions, hepatomegaly, lymphedema, ascites, and pleural lesions are not considered measurable) No symptomatic or known CNS metastases PATIENT CHARACTERISTICS: Age: 18 and over Performance status: WHO 0-1 Life expectancy: Not specified Hematopoietic: Neutrophil count at least 2,000/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 1.75 mg/dL Albumin at least 2.5 g/dL AST and ALT less than 1.5 times upper limit of normal (ULN) (2.5 times ULN if liver metastasis present) Alkaline phosphatase less than 2.5 times ULN No other significant hepatic disease (e.g., active hepatitis, cirrhosis, etc.) Renal: Creatinine no greater than 1.36 mg/dL OR Creatinine clearance at least 60 mL/min Cardiovascular: No prior cardiovascular disease Other: No other severe medical illness No psychosis No prior or concurrent second primary malignant tumors, except adequately treated carcinoma in situ of the cervix or basal cell carcinoma Fertile patients must use effective contraception PRIOR CONCURRENT THERAPY: Biologic therapy: Not specified Chemotherapy: At least 4 weeks since prior chemotherapy No more than 1 prior regimen of combination chemotherapy OR No more than 2 prior single agent regimens No other concurrent chemotherapy Endocrine therapy: Not specified Radiotherapy: No prior radiotherapy to sole index lesion No concurrent radiotherapy Surgery: Not specified Other: No other concurrent investigational drugs