PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: At least 12 weeks Hematopoietic: Absolute neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 1.5 times upper limit of normal (ULN) AST no greater than 5 times ULN Renal: Creatinine normal OR Creatinine clearance at least 60 mL/min Cardiovascular: No symptomatic congestive heart failure No unstable angina pectoris No cardiac arrhythmias No New York Heart Association class III or IV heart disease Neurologic: No peripheral neuropathy grade 2 or greater No uncontrolled seizure disorders Other: Not pregnant or nursing Fertile patients must use effective contraception No uncontrolled concurrent illness No active infection No history of allergy to platinum compounds, irinotecan, antiemetics, or antidiarrheals