1. Department of Pathology, Asahikawa Medical University, Asahikawa, Japan
2. Department of Otolaryngology-Head and Neck surgery, Asahikawa Medical University, Asahikawa, Japan
3. Department of Innovative Head & Neck Cancer Research and Treatment (IHNCRT), Asahikawa Medical University, Asahikawa, Japan
4. Department of surgery, Asahikawa Medical University, Asahikawa, Japan
5. Cancer Immunology, Inflammation and Tolerance Program, Augusta University, Georgia Cancer Center, Augusta, GA