On Wednesday, November 19, 2025, the Radiation Effects Research Foundation (RERF) held the 12th Meeting of the Scientific and Ethics Committee for the Clinical Study of the F1 Offspring of A-bomb Survivors, combining in-person participation at the Hiroshima Laboratory with online attendance. At the meeting, RERF reported on the progress of the Clinical Study of the F1 Offspring of A-bomb Survivors (F1 Clinical Study) to external experts in the fields of clinical medicine, basic science, and ethics. Following conclusion of the meeting, a press conference was held for the media.

The F1 Clinical Study aims to clarify the relationship between parental exposure to radiation from the atomic bombings and disease in their children, as well as the relationship between such exposures and findings observed in biological samples such as blood and urine. The study’s aim is to investigate and understand the hereditary effects of radiation. Another important objective of the study is to contribute to the health and well-being of each participant through medical examinations and health guidance.

Date and Time: November 19, 2025 (Wednesday), 13:30-16:30

Venue: RERF Hiroshima and Nagasaki Laboratories, as well as online (in hybrid format)

Schedule

13:30−13:35	Opening of meeting	RERF Chair Kamiya
13:35−13:45	Introductions	Executive Director Kodama
13:45−13:50	Greetings from Chairman	Chairman Ueshima
13:50−14:05	Progress of the F1 Clinical Study	Clinical Studies Department Chief Ohishi
14:05−14:15	Questions and answers	Chairman Ueshima
14:15−14:45	Report on analysis results of the F1 Clinical Study	Clinical Studies Department Associate Chief Tatsukawa
14:45−15:10	Questions and answers	Chairman Ueshima
15:10−15:20	Break
15:20-15:40	Matters for ethical review	Nagasaki Clinical Studies Department Chief Hida
15:40-15:55	Questions and answers	Vice Chairman Tajima
15:55−16:25	General discussion and summary	Chairman Ueshima
16:25−16:30	Closing address	RERF Vice Chair and Executive Director Rajaraman

 

List of members of the Scientific and Ethics Committee for the Clinical Study of the F1 Offspring of A-bomb Survivors (listed in Japanese alphabetical order; titles omitted)

Chairman

Hirotsugu Ueshima, Professor Emeritus, Shiga University of Medical Science

Vice Chairman

Kazuo Tajima, Director, Sensin Social Welfare Corporation & Misugi Clinic; Honorary Director, Aichi Cancer Center Research Institute

Committee Members

Takashi Kawamoto, Professor Emeritus, Tokyo University; Professor Emeritus, Tohoku University

Shinsuke Kimura, Attorney, Kimura Shinsuke Law Office

Hideo Sasaki, Honorary Professor, Yasuda Women’s University

Masao Tomonaga, Professor Emeritus, Nagasaki University

Yoshimitsu Fukushima, Professors, Shinshu University School of Medicine

Katsumi Furitsu, Assistant Professor, Department of Genetics, Hyogo College of Medicine

Eiji Maruyama, Professor Emeritus, Kobe University

David Richardson,

Associate Dean for Research, UC Irvine Joe C. Wen School of Population & Public Health

Professor, Department of Environmental and Occupational Health, UC Irvine Joe C. Wen School of Population & Public Health

Observer

Kyoji Furukawa, Director, Professor, Biostatistics Center, Kurume University