Dr. Shigehira Saji is currently Professor and Chairman of Department of Medical Oncology, Fukushima Medical University, School of Medicine. He also has an appointment as Director of Medical Oncology and Clinical Oncology Center of Fukushima Medical University Hospital.

He received MD degree in 1992 and PhD degree in 1999 from his hometown university, Gifu University School of Medicine. After residency at Tokyo Metropolitan Komagome Hospital, He accumulated his basic and clinical research experience at Saitama Cancer Center Research Institute (1998), Karolinska Institute, Sweden (1999-2001) and M.D. Anderson Cancer Center, Texas (2003).

Prior to his current appointment, he was chief physician of Tokyo Metropolitan Komagome Hospital (2001-2009), associate professor of Saitama Medical University (2009-2011) and associate professor of Kyoto University Graduate School of Medicine (2011-2014).

His main areas of research include basic biology of hormone dependent breast cancer and translational/clinical research of drug development for breast cancer. He conducted several research projects and published numerous papers in this field. He is involved in running of clinical study groups such as JCOG (Japan Clinical Oncology Group) and JBCRG (Japan Breast Cancer Research Group), and serves as executive board member of JBCRG, JBCS (Japanese Breast Cancer Society), JSMO (Japanese Society of Medical Oncology) and BIG (Breast International Group). He is also Steering Committee member of EBCTCG (Early Breast Cancer Trialists’ Collaborative Group) and a consensus panelist of St.Gallen International Breast Cancer Conference 2025/2027.