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Development of a novel multidisciplinary treatment approach for liver tumors utilizing compensatory liver hypertrophy induced by carbon-ion radiotherapy

Research Project

Project/Area Number 21K08728
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 55020:Digestive surgery-related
Research InstitutionGunma University

Principal Investigator

Shibuya Kei  群馬大学, 大学院医学系研究科, 講師 (50511490)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords肝腫瘍 / 放射線治療 / 粒子線治療 / 代償性肝肥大 / 集学的治療 / 重粒子線治療 / 肝切除
Outline of Research at the Start

肝切除は肝腫瘍に対する強力な治療手段であるが、肝臓の容積が足りずに切除を断念せざるを得ないことも多い。重粒子線治療を切除予定側に照射することで、腫瘍の制御とともに健側葉の代償性肥大が期待できる。本研究では開腹下肝照射モデルと画像解析の手法を用いて重粒子線照射後の肝容積の変化を明らかにし、既存治療の欠点を克服する新たな集学的治療の開発へつなげることを目的とする。

Outline of Final Research Achievements

In an in vivo rat model, partial liver irradiation induced compensatory liver hypertrophy in non-irradiated lobes, similar to portal vein embolization (PVE). Increased hepatocyte proliferation contributed to the mechanism of compensatory hypertrophy. Blood biochemistry tests 12 weeks post-irradiation showed no clear deterioration of liver function, suggesting compensatory hypertrophy helps maintain liver functional reserve. Clinical studies indicated the threshold for hepatocyte damage from carbon ion beams is much higher than X-rays when liver function is preserved, implying superiority in conserving liver function during treatment. However, contrary to expectations, no clear correlation was found between the irradiated area exceeding the threshold dose and liver hypertrophy.

Academic Significance and Societal Importance of the Research Achievements

重粒子線治療を含む放射線治療が有意な代償性肝肥大を引き起こすことが確認され、代償性肝肥大と強力な抗腫瘍効果を併せ持つ新たな術前治療としての可能性が示された。臨床例の検討により、重粒子線照射による肝細胞障害の閾値が古典的な生物学的効果比から算出されるレベルよりも高かったことから、重粒子線治療が生物学的にも肝機能の温存に有利である可能性が示唆された。重粒子線治療と切除を組み合わせた集学的治療につながる知見となることが期待される。

Report

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

    (7 results)

All 2023 2021

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results)

  • [Journal Article] Partial liver irradiation in rats induces the hypertrophy of nonirradiated liver lobes through hepatocyte proliferation2023

    • Author(s)
      Adachi Takuya、Yoshida Yukari、Shibuya Kei、Sato Ken、Yamazaki Yuichi、Kakizaki Satoru、Uraoka Toshio、Takahashi Akihisa
    • Journal Title

      Journal of Radiation Research

      Volume: 64 Issue: 4 Pages: 693-701

    • DOI

      10.1093/jrr/rrad051

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Evaluation of Threshold Dose of Damaged Hepatic Tissue After Carbon-Ion Radiation Therapy Using Gd-EOB-DTPA?Enhanced Magnetic Resonance Imaging2021

    • Author(s)
      Ebara Masashi、Shibuya Kei、Shimada Hirofumi、Kawashima Motohiro、Hirasawa Hiromi、Taketomi-Takahashi Ayako、Ohno Tatsuya、Tsushima Yoshito
    • Journal Title

      Advances in Radiation Oncology

      Volume: 6 Issue: 6 Pages: 100775-100775

    • DOI

      10.1016/j.adro.2021.100775

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] BCLC Stage Aの治療法は?切除 vs. 焼灼 vs. 粒子線2023

    • Author(s)
      渋谷 圭
    • Organizer
      JDDW2023
    • Related Report
      2023 Annual Research Report
  • [Presentation] TACE後の残存・再発病変に対する重粒子線治療2023

    • Author(s)
      渋谷 圭
    • Organizer
      肝癌研究会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 肝臓癌のSRとレジストリ解析2023

    • Author(s)
      渋谷 圭
    • Organizer
      日本量子医学会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 肝癌・肝内胆管癌のエビデンス2023

    • Author(s)
      渋谷 圭
    • Organizer
      癌治療学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Liver Cancer2023

    • Author(s)
      Kei Shibuya
    • Organizer
      International Training Course on Carbon-ion Radiotherapy 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited

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Published: 2021-04-28   Modified: 2025-01-30  

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