OBJECTIVES:
* Determine the pharmacokinetics of docetaxel in older patients with metastatic breast, lung, or prostate cancer.
* Determine the response of patients treated with this drug.
* Determine the toxicity of this drug in these patients.
* Determine the short-term changes in functional status, in terms of activities of daily living, independent activities of daily living, and Karnofsky performance status, in patients treated with this drug.
* Correlate the number of comorbid conditions at baseline with declines in functional status in patients treated with this drug.
OUTLINE: Patients receive docetaxel IV over 30 minutes once weekly for 3 weeks. Courses repeat every 4 weeks in the absence of disease progression or unacceptable toxicity.
PROJECTED ACCRUAL: A total of 20 patients will be accrued for this study within 1 year.