FUMITAKA OBAYASHI

Last Updated :2026/07/03

Affiliations, Positions
Graduate School of Biomedical and Health Sciences, Assistant Professor
E-mail
fumi2390hiroshima-u.ac.jp

Basic Information

Major Professional Backgrounds

  • 2012/04/01, 2013/03/31, Hiroshima University, Hospital, Clinical Resident
  • 2013/04/01, 2014/03/31, Hiroshima University, Hospital, Clinical Fellow
  • 2014/04/01, 2017/03/31, Hiroshima University, Hospital, Clinical staff
  • 2017/04/01, 2023/08/31, Hiroshima University, Hospital, Clinical Fellow
  • 2023/09/01, Hiroshima University, Graduate School of Biomedical and Health Sciences, Assistant Professor

Educational Backgrounds

  • Hiroshima University, Graduate School of Biomedical & Health Sciences , Japan, 2013/04, 2017/03
  • Hiroshima University, School of Dentistry , Japan, 2006/04, 2012/03

Academic Degrees

  • Hiroshima University

Research Fields

  • Medicine,dentistry, and pharmacy;Dentistry;Surgical dentistry

Research Keywords

  • regenerative medicine
  • oral cancer

Affiliated Academic Societies

  • Japanese society of dentistry for medically compromised patient
  • Japanese stomatological society
  • Japanese society of oral and maxillofacial surgeons
  • Japanese society of oral oncology
  • Japan society for head and neck cancer

Educational Activity

Course in Charge

  1. 2026, Undergraduate Education, 1Term, Oral and Maxillofacial Surgery I
  2. 2026, Undergraduate Education, 2Term, Oral and Maxillofacial Surgery II
  3. 2026, Undergraduate Education, First Semester, Dental Research Practices I
  4. 2026, Undergraduate Education, 3Term, Basic Practice of Oral and Maxillofacial Medicine I
  5. 2026, Undergraduate Education, 4Term, Basic Practice of Oral and Maxillofacial Medicine II
  6. 2026, Undergraduate Education, Second Semester, Dental Research Practices II
  7. 2026, Undergraduate Education, 2Term, Advanced Course in Applied Oral Biology and Medicine
  8. 2026, Undergraduate Education, 2Term, Advanced Course in Oral and Maxillofacial Medicine
  9. 2026, Undergraduate Education, 2Term, General Seminar on Clinical Dentistry
  10. 2026, Undergraduate Education, 2Term, General Dentistry III
  11. 2026, Undergraduate Education, First Semester, Dental Research Practices III
  12. 2026, Undergraduate Education, Year, Clinical Practice (Oral Surgery I)

Research Activities

Academic Papers

  1. Postoperative Adjuvant Therapy in Resectable Advanced Oral Squamous Cell Carcinoma With Intermediate Risk Factors, HEAD AND NECK-JOURNAL FOR THE SCIENCES AND SPECIALTIES OF THE HEAD AND NECK, 48(4), 1069-1076, 202604
    Link to Paper Search Results by DOI
  2. Preliminary study for the development of enhanced recovery after surgery program for free flap reconstruction in older population with advanced oral cancer: a single-center retrospective study, BMC CANCER, 25(1), 20251216
    Link to Paper Search Results by DOI
  3. Management and Prognostic Implications of Posteriorly Advanced OSCC in Contact With the Medial Pterygoid Muscle, CANCER MEDICINE, 14(22), 20251120
    Link to Paper Search Results by DOI
  4. High expression of CDKN2A in oral squamous cell carcinoma is associated with distant metastasis: Cell-free DNA as a new prognostic feature, MOLECULAR AND CLINICAL ONCOLOGY, 23(6), 202512
    Link to Paper Search Results by DOI
  5. Prognostic value of inflammation- and nutrition-based biomarkers in patients with recurrent or metastatic oral squamous cell carcinoma treated with immune checkpoint inhibitors: A retrospective study, ONCOLOGY LETTERS, 30(5), 202511
    Link to Paper Search Results by DOI
  6. Relationship between undernutrition and CDDP-induced nephrotoxicity in oral squamous cell carcinoma, JOURNAL OF ORAL AND MAXILLOFACIAL SURGERY MEDICINE AND PATHOLOGY, 37(5), 891-894, 202509
    Link to Paper Search Results by DOI
  7. Clinical value of the worst pattern of invasion in predicting extranodal extension in oral squamous cell carcinoma, DISCOVER ONCOLOGY, 16(1), 20250704
    Link to Paper Search Results by DOI
  8. Analysis of the molecular mechanism of claudin-1 expression in SCCKN cells, oral squamous cell carcinoma cell line, JOURNAL OF ORAL AND MAXILLOFACIAL SURGERY MEDICINE AND PATHOLOGY, 37(4), 607-616, 202507
    Link to Paper Search Results by DOI
  9. Two cases of pediatric-onset orofacial granulomatosis, JOURNAL OF ORAL AND MAXILLOFACIAL SURGERY MEDICINE AND PATHOLOGY, 37(4), 788-792, 202507
    Link to Paper Search Results by DOI
  10. Potential effect of topical antibiotics administration in the oral cavity on the reduced number of bacteria entering the lower respiratory tract after oral cancer surgery, JOURNAL OF DENTAL SCIENCES, 20(1), 319-324, 202501
    Link to Paper Search Results by DOI
  11. Potential role of circulating tumor cells and cell-free DNA as biomarkers in oral squamous cell carcinoma: A prospective single-center study, PLOS ONE, 19(12), 20241227
    Link to Paper Search Results by DOI
  12. A case of lymphoproliferative disease of the palate while receiving infliximab and azathioprine for Crohn's disease, JOURNAL OF ORAL AND MAXILLOFACIAL SURGERY MEDICINE AND PATHOLOGY, 37(2), 365-370, 202503
    Link to Paper Search Results by DOI
  13. Clinical significance and biological role of claudin-1 in oral squamous cell carcinoma cells, ORAL SURGERY ORAL MEDICINE ORAL PATHOLOGY ORAL RADIOLOGY, 139(1), 92-100, 202501
    Link to Paper Search Results by DOI
  14. A case of treatment-related myelodysplastic syndrome in the early stage after radiotherapy in a patient with cancer of the oral floor, JOURNAL OF ORAL AND MAXILLOFACIAL SURGERY MEDICINE AND PATHOLOGY, 36(6), 860-865, 202411
    Link to Paper Search Results by DOI
  15. Extranodal extension in oral squamous cell carcinoma: clinical and histopathological analysis, ORAL SURGERY ORAL MEDICINE ORAL PATHOLOGY ORAL RADIOLOGY, 137(6), 632-639, 202406
    Link to Paper Search Results by DOI
  16. A case of multiple myeloma diagnosed by extramedullary disease in the submandibular region, 35, 247-250, 2023
  17. A case of multiple myeloma diagnosed by extramedullary disease in the submandibular region, J Oral Maxillofac Surg Med Pathol, 35(3), 247-250, 2023
  18. Tumor-infiltrating CD45RO+ memory cells are associated with favorable prognosis in oral squamous cell carcinoma patients, Cancers, 15(8), 2221, 2023
  19. Primary intraosseous carcinoma complicated by cervical hodgkin lymphoma: a rare case report, J Oral Maxillofac Surg Med Pathol, 36(1), 38-43, 2023
  20. Case of amyloid variant of central odontogenic fibroma with neural involvement, Int J Oral Maxillofac Surg, 52(10), 1035-1038, 2023
  21. Perioperative management of maxillary cyst and genetic analysis in a patient with glycogen storage disease type 1a: A rare case report, ORAL SCIENCE INTERNATIONAL, 21(2), 285-290, 202405
    Link to Paper Search Results by DOI
  22. A Study of the Prognostic Factors for Late Cervical Lymph Node Metastasis and Distant Metastasis in Patients with cT1-2N0 Tongue Cancer, JOURNAL OF CLINICAL MEDICINE, 13(4), 202402
    Link to Paper Search Results by DOI
  23. Skin Symptoms That Appeared after Fixation with a Titanium Plate in a Jaw Deformity Patient Suffering from Palmoplantar Pustulosis: A Case Report, DENTISTRY JOURNAL, 11(11), 2023
    Link to Paper Search Results by DOI
  24. Central odontogenic fibroma with amyloid: a diagnostically challenging case, INTERNATIONAL JOURNAL OF ORAL AND MAXILLOFACIAL SURGERY, 52(10), 1035-1038, 202310
    Link to Paper Search Results by DOI
  25. Primary intraosseous carcinoma complicated by cervical hodgkin lymphoma: A rare case report, JOURNAL OF ORAL AND MAXILLOFACIAL SURGERY MEDICINE AND PATHOLOGY, 36(1), 38-43, 202401
    Link to Paper Search Results by DOI
  26. Molecular and histopathological findings in malignant transformation of proliferative verrucous leukoplakia that was successfully controlled for 15 years, JOURNAL OF ORAL AND MAXILLOFACIAL SURGERY MEDICINE AND PATHOLOGY, 36(1), 153-158, 202401
    Link to Paper Search Results by DOI

Invited Lecture, Oral Presentation, Poster Presentation

  1. A clinicopathological study of resected margins affecting local recurrence in superficial tongue carcinoma, Obayashi F, Higaki M, Hamada A, Yamasaki S, Ito N, Koizumi K, Yanamoto S., The 37th Annual Congress of TAOMS (Taiwan), 2025/03/08, Without Invitation, English
  2. Secular changes of circulating tumor cells and cell-free DNA in blood with oral squamous cell 2023 carcinoma, Eboshida N, Hamada A, Asada Y, Ueda Y, Uehara T, Odawara A, Yamasaki E, Matsuyama T, Okamoto K, Fukutani T, Nobumoto T, Obayashi F, Ito N, Ishida Y, Higaki M, Yamasaki S, Hamana T, Koizumi K, Yoshioka Y, Tani R, Yanamoto S, 9th World Congress of the International Academy of Oral Oncology 2023 (Incheon), 2023/11/01, Without Invitation, English
  3. A retrospective study of high-risk factors for metastasis in patients with resected T1-2N0 tongue cancer, Obayashi F, Koizumi K, Higaki M, Ito N, Nobumoto T, Fukutani T, Hamada A, Yamasaki S, Ishida Y, Ando T, Hamana T, Yoshioka Y, Shintani T, Tani R, Yanamoto S, 9th World Congress of the International Academy of Oral Oncology 2023 (Incheon), 2023/11/01, English
  4. Clinical analysis of the elderly patients with oral squamous cell carcinoma, Hamada A, Koizumi K, Fukutani T, Yamasaki E, Uehara T, Eboshida N, Nobumoto T, Higaki M, Obayashi F, Yamasaki S, Ito N, Ishida Y, Hamana T, Yoshioka Y, Tani R, Yanamoto S, 9th World Congress of the International Academy of Oral Oncology 2023 (Incheon), 2023/11/01, Without Invitation, English
  5. Clinical significance of extranodal extension of cervical lymph node metastasis in oral squamous cell carcinoma, Higaki M, Koizumi K, Ando T, Obayashi T, Ito N, Shintani T, Hamana T, Yoshioka Y, Tani R, Yanamoto S, 9th World Congress of the International Academy of Oral Oncology 2023 (Incheon), 2023/11/01, Without Invitation, English
  6. Investigation of local recurrence of oral cancer: relationship with anatomical landmarks in cases of backward progression, Ito N, Koizumi K, Shintani T, Asada Y, Fukutani T, Hamada A, Yamasaki S, Hamana T, Yoshioka Y, Yanamoto S, 9th World Congress of the International Academy of Oral Oncology 2023 (Incheon), 2023/11/01, Without Invitation, Japanese
  7. Research about the circulating tumor cells and circulating cell-free DNA in blood of oral squamous cell carcinoma, Eboshida N, Hamada A, Matsuyama T, Obayashi F, Kimura N, Ito N, Higaki M, Yamasaki S, Koizumi K, Yoshioka Y, Yanamoto S., The 35th Annual Congress on Oral and Maxillofacial Surgery (Taipei), 2023/03/11, Without Invitation, Japanese

External Funds

Acceptance Results of Competitive Funds

  1. 2020/04/01, 2022/03/31