PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: Greater than 12 weeks Hematopoietic: Absolute neutrophil count greater than 1,500/mm3 Platelet count greater than 100,000/mm3 Hemoglobin greater than 9 g/dL Hepatic: Bilirubin normal PT or PTT normal ALT or AST less than 2.5 times upper limit of normal Renal: Creatinine less than 1.5 mg/dL OR Creatinine clearance greater than 60 mL/min Cardiovascular: No myocardial infarction, stroke, or congestive heart failure within 3 months Other: HIV negative Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception No history of gastrointestinal disorders that interfere with absorption of COL-3 No active infections or other medical illnesses No psychological or social problems No emotional disorder or substance abuse No hypersensitivity to tetracycline or its derivative