1. 1Cancer and Thoracic Surgery, Departments of
2. 2Hematology, Oncology and Respiratory Medicine,
3. 5Hamon Center for Therapeutic Oncology Research and
4. 3Pathology, and
5. 4Hygiene and Preventive Medicine, Graduate School of Medicine and Dentistry, Okayama University, Okayama, Japan and
6. 6Department of Pathology, University of Texas Southwestern Medical Center, Dallas, Texas