PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: At least 12 weeks Hematopoietic: WBC at least 3,000/mm3 Granulocyte count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hemoglobin at least 9 g/dL Hepatic: Bilirubin no greater than 2 times upper limit of normal (ULN) SGOT or SGPT no greater than 3 times ULN (no greater than 5 times ULN if liver metastases present) Renal: Creatinine less than 2.0 mg/dL Cardiovascular: No uncontrolled hypertension No unstable angina No congestive heart failure No myocardial infarction within the past 6 months No serious cardiac arrhythmia Pulmonary: No interstitial pneumonia or fibrosis Gastrointestinal: No symptomatic cholelithiasis No gastrointestinal disease that may result in nontherapy related diarrhea Other: Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception No other medical or surgical disease that may result in nontherapy related diarrhea No other severe disease that would preclude study No mental incapacity or psychiatric illness that would preclude study No uncontrolled diabetes mellitus No hypersensitivity to octreotide or any of its excipients No active or uncontrolled infection HIV negative No active second malignancy within the past 5 years except nonmelanomatous skin cancer or cervical carcinoma in situ of the cervix