1. Department of Surgical Oncology Graduate School of Medicine Tohoku University Seiryo‐machi, Aoba‐ku Sendai 980‐8574 Japan
2. Department of Nano‐Medical Science Graduate School of Medicine Tohoku University Seiryo‐machi, Aoba‐ku Sendai 980‐8575 Japan
3. Department of Medical Physics Graduate School of Medicine Tohoku University Seiryo‐machi, Aoba‐ku Sendai 980‐8575 Japan
4. Department of Pathology Tohoku University Hospital Seiryo‐machi, Aoba‐ku Sendai 980‐8574 Japan
5. Department of Advanced Surgical Science and Technology Graduate School of Medicine Tohoku University Seiryo‐machi, Aoba‐ku Sendai 980‐8574 Japan