Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany. Institute of Neuroscience and Medicine, Research Center Juelich, Juelich, Germany. Center of Integrated Oncology, Universities of Aachen, Bonn, Cologne, and Düsseldorf, Germany. Department of Stereotaxy and Functional Neurosurgery, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany. Institute of Neuropathology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany. Department of Radiological Sciences, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA. Department of Neuro-Oncology, University and City of Health and Science Hospital, Turin, Italy. Neuro-Oncology, General and Stereotaxic Neurosurgery Service, University Hospital Lille, Lille, France. Breast Cancer Department, Oscar Lambret Center, Lille, France. Department of Neurology & Brain Tumor Center, University Hospital and University of Zurich, Zurich, Switzerland. Department of Neurosurgery, Ludwig Maximilians University of Munich, Munich, Germany. German Cancer Consortium, partner site Munich, Germany. Department of Nuclear Medicine, University Hospital Aachen, Aachen, Germany.