PATIENT CHARACTERISTICS: Age: 18 and over Performance status: Karnofsky 60-100% Life expectancy: At least 12 weeks Hematopoietic: Granulocyte count at least 2,000/mm3 Platelet count at least 100,000/mm3 Hemoglobin at least 10 g/dL Hepatic: Bilirubin no greater than 1.5 times upper limit of normal (ULN) SGOT less than 2.5 times ULN Alkaline phosphatase less than 5 times ULN (except in cases of bone or liver metastases) Renal: Creatinine no greater than 1.5 times ULN Cardiovascular: No unstable or uncontrolled cardiac disease Pulmonary: No history of recurrent aspiration pneumonitis within the past 3 months Other: Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception during and for 9 days after study Able to swallow capsules intact No active infection within the past 2 weeks No unstable or uncontrolled medical conditions No other prior malignancy within the past 5 years except basal cell skin cancer or carcinoma in situ of the cervix No history of peripheral neuropathy with severity greater than CALGB grade 1