1. Department of Clinical and Biological Sciences (M.V., I.R., D.G., M.P.), San Luigi Hospital, 10043 Orbassano, Italy
2. Department of Pathology (M.G., Y.E.N.), University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15260
3. Department of Biomedical Sciences and Human Oncology (G.B.), University of Turin, 10126 Turin, Italy