Munechika Misumi


Department of Statistics


Dr. Misumi’s current interests are in research related to evaluating and correcting the impact of dosimetric uncertainty on radiation risk estimates obtained from the major RERF cohorts. He has authored and co-authored scientific papers related to dose uncertainty and missing data in the atomic bomb survivors studies and is actively involved in various research projects on these topics. He previously extended a simulation-extrapolation (SIMEX) for application to the conventional grouped-data analysis of radiation epidemiology and published the result with a comprehensive review of methods proposed for dosimetric uncertainty of RERF data. Under a research grant from the Japanese Ministry of Education, Culture, Sports, Sciences and Technology, he conducted studies on the impact of dosimetric uncertainty on the shape of the radiation dose-response curve at low doses. An additional area of interest are problems related to subjects’ dropout and missing data, not only the measurement errors of observed covariates, and issues related to the outcome-dependent observational times and competing risks, where he is working on statistical methods for studies to investigate mechanisms of exposure-related diseases that take into account such issues due to the characteristics of longitudinal studies.


Ph.D., Nagasaki University, Nagasaki, Japan
Master of Statistics (with Biomedical concentration), North Carolina State University, Raleigh, NC, USA


Radiation Effects Research Foundation, Department of Statistics
  • 2020- Assistant Department Chief
  • 2019Associate Senior Scientist
  • 2008-2018Research Scientist
Hiroshima University, School of Pharmaceutical Sciences, Hiroshima, Japan
  • 2016-

    Visiting Associate Professor

  • 2015⁻2016

    Part-time Lecturer

Kyushu University, Fukuoka, Japan
  • 2009⁻2016Part-time Lecturer, School of Medicine
Kyushu University Hospital, Fukuoka, Japan
  • 2007-2008Assistant Professor

Selected publications

Kengo Yoshida, Munechika Misumi, Yoichiro Kusunoki, Michiko Yamada. Longitudinal changes in red blood cell distribution width decades after radiation exposure in atomic-bomb survivors. British Journal of Haematology. 2021; 193(2):406-409.
Hiromi Sugiyama, Munechika Misumi, Alina Brenner, Ritsu Sakata, Mai Utada, Kotaro Ozasa. Mortality among individuals exposed to atomic bomb radiation in utero; 1950-2012. European Journal of Epidemiology. 2021; 36(4):415-428.
Jan Christian Kaiser, Munechika Misumi, Kyoji Furukawa. Biologically-based modelling of radiation risk and biomarker prevalence for papillary thyroid cancer in Japanese a-bomb survivors 1958 – 2005. International Journal of Radiation Biology. 2021; 97(1):19-30.
Mark P Little, David Pawel, Munechika Misumi, Harry Cullings, Kotaro Ozasa. Lifetime Mortality Risk from Cancer and Circulatory Disease Predicted from the Japanese Atomic Bomb Survivor Life Span Study Data Taking Account of Dose Measurement Error. Radiation Research. 2020; 194 (3): 259–276.
Hiromi Sugiyama, Munechika Misumi, Alina Brenner, Eric J. Grant, Ritsu Sakata, Atsuko Sadakane, Mai Utada, Dale L. Preston, Kiyohiko Mabuchi, Kotaro Ozasa. Radiation risk of incident colorectal cancer by anatomical site among atomic bomb survivors: 1958–2009. International Journal of Cancer, 2020; 146(3):635-645.
Norio Takahashi, Munechika Misumi, Yasuharu Niwa, Hideko Murakami, Waka Ohishi, Toshiya Inaba, Akiko Nagamachi, Satoshi Tanaka, Ignaca Braga-Tanaka, Gen Suzuki. Effects of irradiation on blood pressure and body weight in the spontaneously hypertensive rat (SHR) animal model. Are radiation effects for blood pressure affected by genetic back ground?. Radiation Research. 2020; 193(6):552-559,
Kyoji Furukawa, Munechika Misumi. A semiparametric approach to evaluate the harm of low-dose exposures. Journal of Radiological Protection. 2018; 8:286–298.
Munechika Misumi, Kyoji Furukawa, John Cologne, Harry Cullings. Simulation-extrapolation for bias correction with exposure uncertainty in radiation risk analysis utilizing grouped data. Journal of the Royal Statistical Society series C (Applied Statistics). 2018; 67(1): 275–289.
Kyoji Furukawa, Dale Preston, Munechika Misumi, Harry M. Cullings. Handling incomplete smoking history data in survival analysis. Statistical Methods in Medical Research. 2017, 26(2): 707–723.
Kyoji Furukawa, Munechika Misumi, John B. Cologne, Harry M. Cullings. A Bayesian Semiparametric Model for Radiation Dose-Response Estimation. Risk Analysis. 2016 June; 36(6):1211-23.