*Laboratory of Pathology, National Cancer Institute, Bethesda, Maryland

†Department of Clinical and Experimental Pathology, Wroclaw Medical University, Wrocław

‡Department of Tumor Pathology, Maria Skłodowska-Curie National Research Institute of Oncology, Cracow Branch, Poland

Supported as a part of NCI’s intramural research program

Conflicts of interest and Source of Funding: The authors have disclosed that they have no significant relationships with, or financial interest in, any commercial companies pertaining to this article.

Correspondence: Maciej Kaczorowski, MD, Department of Clinical and Experimental Pathology, Wroclaw Medical University, Ul. Borowska 213, 50-556 Wroclaw, Poland (e-mail: [email protected]).