1. Division of Epigenomics, National Cancer Center Research Institute, Tokyo 104 0045, Japan
2. Department of Pathology, Faculty of Medicine, University of Tsukuba, Ibaraki 305 8575, Japan
3. Department of Thoracic Surgery, Faculty of Medicine, University of Tsukuba, Ibaraki 305 8575, Japan
4. Department of Thoracic Surgery, National Cancer Center Hospital, Tokyo 104 0045, Japan
5. Department of Diagnostic Pathology, National Cancer Center Hospital, Tokyo 104 0045, Japan