The Japan Clinical Oncology Group (JCOG) is the largest Japanese cooperative group funded primarily by the National Cancer Center Research and Development Fund.


Standing Committee
Standing Committee Chair Role
Executive Committee Kensei Tobinai MD, PhD
  • Determine JCOG policies
  • Approve/disapprove protocol concepts
Protocol Review Committee Kaoru Kubota MD
  • Review protocol concepts
  • Review and approve study protocols
Data and Safety Monitoring Committee Nagahiro Saijo MD, PhD
  • Monitor study progress
  • Review adverse event reports
  • Approve/disapprove protocol amendment/revision
  • Approve/disapprove study continuation (interim analysis)
Audit Committee Masanori Shimoyama MD, PhD
  • Conduct site visit audit
Education and Training Committee Seiichiro Yamamoto PhD
  • Plan and conduct educational programs
Conflict of Interest Committee Nobutoshi Ando MD
  • Manage conflict of interest
Discipline Committee
Discipline Committee Chair Role
Radiotherapy Committee Kazushige Hayakawa MD, PhD
  • Quality control and quality assurance of radiotherapy
Pathology Committee Yoshihiro Matsuno MD
  • Quality control and quality assurance of pathological diagnosis
Translational Research Committee Yasuhiro Matsumura MD, PhD
  • Develop and streamline the system of translational research
  • Review translational research concept/protocol
Diagnostic Radiology Committee Hirokazu Watanabe MD, PhD
  • Support central reviews of imaging
Regulatory Affairs Committee Yasuhiro Fujiwara MD, PhD
  • Collect and distribute regulatory information
Clinical Research Professionals Committee Harumi Kaba RN, CCRP
  • Facilitate the collaboration between central and local CRPs
  • Improve JCOG study quality in the viewpoint of CRPs
Ad hoc Committee
Ad hoc Committee Chair Role
Geriatric Study Committee Fumio Nagashima MD, PhD
  • Define elderly/frail patients
  • Develop screening tools of elderly/frail
  • Develop “JCOG geriatric study policy”