 - Patients with measurable disease must have at least one objective measurable disease parameter; a clearly defined, bi-dimensionally measurable defect or mass measuring at least 1.5 cm in diameter on the CT portion of a PETCT or CT scan or magnetic resonance imaging MRI if appropriate will constitute measurable disease; proof of lymphoma in the liver is required by a confirmation biopsy; skin lesions can be used as measurable disease provided bi-dimensional measurements are possible 