PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Karnofsky 60-100% Life expectancy: Greater than 12 weeks Hematopoietic: WBC at least 3,000/mm3 Absolute neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin normal AST/ALT no greater than 2.5 times upper limit of normal Renal: Creatinine normal Cardiovascular: No history of symptomatic congestive heart failure, unstable angina, or cardiac arrhythmia (e.g., supraventricular tachycardia or atrial fibrillation) Other: Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception No significant episodes of hypoglycemia in past 6 months No known allergies to compounds of similar chemical or biologic composition to chloroquinoxaline sulfonamide No known glucose-6 phosphate deficiency or hemolytic anemia No uncontrolled concurrent illness (e.g., active infection) No concurrent psychiatric illness or social condition that would preclude compliance