1. Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, New York.
2. Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, New York.
3. Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, New York.
4. Department of Experimental, Diagnostic and Specialty Medicine-Anatomic Pathology, University of Bologna School of Medicine, Bologna, Italy.