PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Karnofsky 60-100% Life expectancy: Not specified Hematopoietic: WBC at least 3,000/mm3 Absolute granulocyte count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hemoglobin at least 10 g/dL Hepatic: Bilirubin no greater than 2.0 mg/dL Alkaline phosphatase no greater than 4 times upper limit of normal (ULN) SGOT or SGPT no greater than 4 times ULN PT and aPTT normal Renal: Creatinine no greater than 1.5 mg/dL Other: Not pregnant or nursing Fertile patients must use effective contraception Negative pregnancy test No serious infection or medical illness No history of glucose-6-phosphate dehydrogenase deficiency No known porphyria No other prior malignancy within the past 5 years except curatively treated basal or squamous cell carcinoma of the skin or carcinoma in situ of the cervix or breast