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Development of statistical methods for low-dose radiation risk assessment

Research Project

Project/Area Number 20K11721
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 60030:Statistical science-related
Research InstitutionKurume University

Principal Investigator

Furukawa Kyoji  久留米大学, 付置研究所, 教授 (00416421)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywordsリスク解析 / 生存時間分析 / Frailty model / 放射線疫学 / 発がんモデル / フレイルティモデル / 放射線影響 / 生存時間解析 / ノンパラメトリックモデル / リスク予測
Outline of Research at the Start

医療や職業等における放射線被曝の機会が増えるとともに、放射線の健康影響を正しく評価することが求められている。放射線影響に関するこれまでの知見は、主に被曝集団の疫学調査から得られてきたもの、長期観察研究に起因する多くの複雑で不確実な問題により、最も注目される低線量域でのリスクの理解は依然として限定的である。本研究は、放射線リスク評価における不確実性要因、特に放射線量反応の経時的変化に関するモデリングと放射線感受性の個人差に焦点を当て、低線量被曝に伴うリスク評価や予測に適した統計モデルと手法を開発する。本研究の遂行は、安全で適切な放射線利用のための有益な情報を与え、放射線防護への貢献が期待される。

Outline of Final Research Achievements

With increasing opportunities for radiation exposure from medical, occupational, and environmental sources, appropriate evaluation of radiation-associated risks is required. This study developed a modeling framework suitable for correct understanding of the radiation risks in epidemiological studies. First, we formulated the Poisson survival time regression method as a flexible risk analysis method that enables us to evaluate the dose response and the time-dependent pattern of risk in more detail and evaluated its estimation performance. To address potential problems such as heterogeneity due to unobserved factors such as individual differences in radiosensitivity and correlations among multiple survival endpoints including competing risks, we developed a risk analysis method extended to a generalized linear mixed effects model including random effects (frailty).

Academic Significance and Societal Importance of the Research Achievements

本研究は、放射線リスク評価において、これまで十分に検討されなかった不確実性を持つ要因、特にリスクの経時的変化と放射線感受性の個人差に焦点を当て、低線量被曝に伴うリスクの評価や予測に適した新しいモデリングと統計手法の開発を行った。本研究の成果は、低線量放射線リスクの評価結果に新たな知見を与え、安全で適切な放射線利用のための根拠に基づく意思決定のための有益な情報として、放射線防護への貢献が期待される。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (23 results)

All 2024 2023 2022 2021 2020

All Journal Article (8 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 7 results,  Open Access: 3 results) Presentation (15 results) (of which Int'l Joint Research: 4 results,  Invited: 5 results)

  • [Journal Article] フレイルティモデル -生存分析におけるランダム効果-2024

    • Author(s)
      江村剛志, 古川恭治
    • Journal Title

      計量生物学

      Volume: 45

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Survival Analysis with Poisson Random Effect Model2023

    • Author(s)
      古川恭治
    • Journal Title

      Journal of the Japan Statistical Society, Japanese Issue

      Volume: 52 Issue: 2 Pages: 131-152

    • DOI

      10.11329/jjssj.52.131

    • ISSN
      0389-5602, 2189-1478
    • Year and Date
      2023-03-01
    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] SUMRAY: R and Python Codes for Calculating Cancer Risk Due to Radiation Exposure of a Population2023

    • Author(s)
      Sasaki Michiya、Furukawa Kyoji、Satoh Daiki、Shimada Kazumasa、Kudo Shin’ichi、Takagi Shunji、Takahara Shogo、Kai Michiaki
    • Journal Title

      Journal of Radiation Protection and Research

      Volume: 48 Issue: 2 Pages: 90-99

    • DOI

      10.14407/jrpr.2022.00213

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] ポアソン混合効果モデルによる生存時間分析: Survival analysis with Poisson random effect model.2023

    • Author(s)
      古川恭治
    • Journal Title

      日本統計学会誌

      Volume: 52 Pages: 131-152

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Early‐life atomic‐bomb irradiation accelerates immunological aging and elevates immune‐related intracellular reactive oxygen species2023

    • Author(s)
      Hayashi Tomonori、Kato Naohiro、Furudoi Keiko、Hayashi Ikue、Kyoizumi Seishi、Yoshida Kengo、Kusunoki Yoichiro、Furukawa Kyoji、Imaizumi Misa、Hida Ayumi、Tanabe Osamu、Ohishi Waka
    • Journal Title

      Aging Cell

      Volume: 22 Issue: 10 Pages: 1-11

    • DOI

      10.1111/acel.13940

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Heterogeneity in coronary heart disease risk2022

    • Author(s)
      Simonetto, Rospleszcz, Kaiser, Furukawa
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1 Pages: 1-9

    • DOI

      10.1038/s41598-022-14013-3

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] The Bayesian approach to evidence-based decision making2021

    • Author(s)
      Kyoji FUrukawa, Tetsuji Ohyama
    • Journal Title

      J Hepatobiliary Pancreat Sci

      Volume: 6 Issue: 6 Pages: 457-460

    • DOI

      10.1002/jhbp.997

    • Related Report
      2021 Research-status Report
  • [Journal Article] Evaluation of the lifetime brain/central nervous system cancer risk associated with childhood head CT scanning in Japan.2020

    • Author(s)
      Yuko Kadowaki,Nobuyuki Hamada,Michiaki Kai,Kyoji Furukawa
    • Journal Title

      Int J Cancer.

      Volume: 148 Issue: 10 Pages: 2429-2439

    • DOI

      10.1002/ijc.33436

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 一般化線形混合効果モデルによる生存時間分析2024

    • Author(s)
      古川恭治
    • Organizer
      第18回日本統計学会春季集会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 一般化線形フレイルティモデルを用いた多変量生存時間解析2024

    • Author(s)
      寺西蓮、江村剛志、古川恭治
    • Organizer
      第18回日本統計学会春季集会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 放射線関連がんリスクモデルの予測精度による評価.2023

    • Author(s)
      古川恭治
    • Organizer
      日本保健物理学会第56回研究発表会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Sex-related variation in radiogenic cancer risk2022

    • Author(s)
      Furukawa, K.
    • Organizer
      International Workshop on Individual Response to Ionizing Radiation, Stockholm
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] ポアソン混合効果モデルによる生存時間分析2022

    • Author(s)
      古川恭治
    • Organizer
      2022年度統計関連学会連合大会, 東京
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Evaluation of the lifetime cancer risk associated with childhood CT scanning in Japan2022

    • Author(s)
      Kadowaki, Y. and Furukawa, K.
    • Organizer
      Radiation Research Society Annual Meetings, Hawaii, US
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 放射線被ばくに伴うがんリスクの推定コードの開発 (1) リスク計算の概要と特徴2022

    • Author(s)
      佐々木、古川他
    • Organizer
      第4回日本保健物理学会・日本放射線安全管理学会合同大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 放射線被ばくに伴うがんリスクの推定コードの開発 (2) Rコード及びPythonコード2022

    • Author(s)
      佐藤、古川、甲斐、佐々木他
    • Organizer
      第4回日本保健物理学会・日本放射線安全管理学会合同大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 放射線被ばくに伴うがんリスクの推定コードの開発 (3) 数値の検証と展望2022

    • Author(s)
      甲斐、佐々木、佐藤、古川他
    • Organizer
      第4回日本保健物理学会・日本放射線安全管理学会合同大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 小児期における頭部CT検査関連の 脳/中枢神経系がん生涯リスク予測2022

    • Author(s)
      門脇ゆう子、古川恭治
    • Organizer
      第32回日本疫学会学術総会(online)
    • Related Report
      2021 Research-status Report
  • [Presentation] 生存時間解析における未観測不均一性 - 長期疫学リスク評価での影響2021

    • Author(s)
      古川恭治
    • Organizer
      2021年度統計関連学会連合大会(online)
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Statistical issues in estimating factors affecting the individual response to radiation2021

    • Author(s)
      Kyoji Furukawa
    • Organizer
      The 2021 Western North American Region (WNAR) of the International Biometrics Society Meeting(online)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 放射線防護のためのリスク予測の現状と課題2021

    • Author(s)
      甲斐倫明、古川恭治
    • Organizer
      第3回日本放射線安全管理学会・日本保健物理学会合同大会(online)
    • Related Report
      2021 Research-status Report
  • [Presentation] Variation in radiation-associated cancer risks: evidence from Atomic-bomb survivors.2021

    • Author(s)
      Kyoji Furukawa
    • Organizer
      ICRP Workshop on factors influencing individual response to radiation and possibility of prediction (online)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Impact of varying the assumptions and additional uncertainties in calculation of lifetime cancer risk associated with childhood CT scanning2020

    • Author(s)
      Kadowaki Y, Kai M, Furukawa K.
    • Organizer
      日本放射線影響学会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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