DISEASE CHARACTERISTICS: Histologically confirmed metastatic cancer of any type Measurable or evaluable disease required, i.e.: Bidimensionally measurable lesions on physical exam, x-ray, CT, MRI, or other radiologic procedure Any lesion apparent on radiologic exam that is not measurable in 2 perpendicular diameters Previously irradiated lesions acceptable provided subsequent progression is documented No active brain metastases Previously treated brain metastases allowed provided measurable/evaluable disease exists outside the CNS