PATIENT CHARACTERISTICS: Age: 18 and over Menopausal status: Not specified Performance status: Karnofsky 70-100% OR ECOG 0-1 Life expectancy: At least 3 months Hematopoietic: Granulocyte count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hematocrit at least 30% (transfusion allowed) No bleeding disorder Hepatic: Bilirubin no greater than 1.5 times upper limit of normal (ULN) ALT/AST no greater than 1.5 times ULN (3 times ULN in the presence of liver metastases) Alkaline phosphatase no greater than 1.5 times ULN (3 times ULN in the presence of liver metastases) PT and aPTT no greater than 1.5 times ULN No end stage liver disease Renal: Creatinine no greater than 1.5 times ULN No urinary tract stones No end stage renal disease Cardiovascular: No known valvular disease or ischemic peripheral vascular disease No clinically significant atherosclerotic disease or arterial aneurysm(s) No unstable angina No active coronary artery disease requiring medication No myocardial infarction within the past 6 months No congenital heart failure or cardiac arrhythmia requiring medication Pulmonary: No severe oxygen-dependent chronic obstructive pulmonary disease Other: HIV negative Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception Permanent central venous catheters and other indwelling devices allowed if easily removed or replaced No gallstones No active infection No Salmonella infection within the past 6 months No fever caused by tumor or unknown cause (daily temperature no greater than 38 degrees C) No immunodeficiency No other life-threatening illness No commercial food handler, day-care worker, or health-care worker who plans to continue employment during protocol treatment No allergy to quinolone or cephalosporin antibiotics