- All patients must have measurable disease as defined by immune-related Response Evaluation Criteria in Solid Tumors (irRECIST); measurable disease is defined as 10 mm in the longest diameter by computed tomography (CT) or magnetic resonance imaging (MRI) scan (or no less than double the slice thickness) for non- nodal lesions and >= 15 mm in short axis for nodal lesions, 20 mm by chest X-ray, a lymph node must be >= 15 mm in short axis when assessed by CT scan (CT scan slice thickness recommended to be no greater than 5 mm)