- Patients must have bidimensionally measurable disease within 28 days prior to registration; a diagnostic quality computed tomography (CT) scan of the chest abdomen, pelvis, neck and positron emission tomography (PET)/CT must be performed within 28 days of registration (PET/CT scan can be done instead of separate PET and CT scans only if the CT component is a diagnostic CT with contrast); patients who also have non-measurable disease in addition to measurable disease must have all non-measurable disease assessed within 42 days prior to registration