1. Department of Pathology, Laboratory of Cancer Medical Science Hokuto Hospital Obihiro Hokkaido Japan
2. Department of Pathology Kagoshima University Graduate School of Medical and Dental Sciences Kagoshima Japan
3. Center for Human Genome and Gene Analysis Kagoshima University Hospital Kagoshima Japan
4. Department of Biology and Genetics Laboratory of Cancer Medical Science, Hokuto Hospital Obihiro Hokkaido Japan
5. Keio Cancer Center Keio University School of Medicine Shinjuku‐ku Tokyo Japan
6. Department of Diagnostic Pathology Asahikawa Medical University Asahikawa Hokkaido Japan
7. Department of Neurosurgery, Hokuto Hospital Obihiro Hokkaido Japan