4. All patients must have measurable disease. Measurable disease is defined as lesions that can be accurately measured in at least one dimension (longest dimension to be recorded). Each lesion must be > 20 mm when measured by conventional techniques, including palpation, plain x-ray, CT, and MRI, or > 10 mm when measured by spiral CT. Ascites and pleural effusions are not considered measurable disease. If the measurable disease is restricted to a solitary lesion, its neoplastic nature should be confirmed by cytology/histology.