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Immune-escape mechanism of relapsed leukemic cells after multiple transplantation

Research Project

Project/Area Number 18K08376
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 54010:Hematology and medical oncology-related
Research InstitutionHyogo Medical University

Principal Investigator

Ikegame Kazuhiro  兵庫医科大学, 医学部, 講師 (20372609)

Co-Investigator(Kenkyū-buntansha) 海田 勝仁  兵庫医科大学, 医学部, 助教 (00441254)
小川 誠司  京都大学, 医学研究科, 教授 (60292900)
南谷 泰仁  京都大学, 医学研究科, 特定准教授 (60451811)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
KeywordsHLA不適合造血幹細胞移植 / 白血病 / 再発 / GVHD / HLA / 不適合移植 / HLA不適合移植 / HLA-LOH
Outline of Final Research Achievements

We planed in vitro assays and a clinical trial concerning the theses that both HLA haplotypes could be lost after HLA-mismatched transplantations, and if not, 2-HLA-haplotype mismatched transplantation may be beneficial. Since the Corona pandemic led to difficulty in smoothly performing the in vitro assays, we focused on the clinical trial of 2-HLA-haplotype mismatched transplantation.
2-HLA-haplotype mismatched transplantation targets both HLA haplotypes at once, and the analyses of the relapsed leukemic cells after this type of transplantation may be a clue to the former question. In the clinical trial of 2-HLA-haplotype mismatched transplantation, all 30 cases except a case of early death achieved engraftment. The incidence of severe acute GVHD was 16.7%, and the rates of one-year overall survival, relapse, and non-relapse mortality were 30.1%, 38.9%, and 44.3%, respectively.

Academic Significance and Societal Importance of the Research Achievements

HLA半合致移植は急速に普及してきたが、標的となるHLAを消失して白血病が再発することが知られている。では残ったHLAを標的とする再移植をすれば、両方のHLAを落とすのだろうか。HLA消失機序の解析によれば、一方は落とせても両方は無理なことが予想される。もしそうなら、両方のHLAを標的とする移植を行えば、HLA消失による再発は克服できる。我々は両方のHLAが異なる移植(両HLAハプロタイプ不適合移植)の臨床試験を行い、これが実際に可能であることを示した。これによって、もはやHLAの制約から移植を断念する必要はなくなり、再移植でしか助からない症例に、更なる移植の機会を提供することが可能となった。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (3 results)

All 2020

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (2 results) (of which Invited: 1 results)

  • [Journal Article] Allogeneic hematopoietic stem cell transplantation from a 2-HLA-haplotype-mismatched family donor for posttransplant relapse: a prospective phase I/II study2020

    • Author(s)
      Ikegame Kazuhiro、Kaida Katsuji、Fukunaga Keiko、Osugi Yuko、Yoshihara Kyoko、Yoshihara Satoshi、Ishii Shinichi、Fujino Satoshi、Yamashita Takaya、Mayumi Azusa、Maruyama Satoshi、Teramoto Masahiro、Inoue Takayuki、Okada Masaya、Tamaki Hiroya、Ogawa Hiroyasu、Fujimori Yosihiro
    • Journal Title

      Bone Marrow Transplantation

      Volume: 56 Issue: 1 Pages: 70-83

    • DOI

      10.1038/s41409-020-0980-8

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 移植後再発に対する、両方のHLAがともに異なる血縁ドナーからの移植(フルアロ移植)2020

    • Author(s)
      177)池亀和博、海田勝仁、福永景子、大杉夕子、吉原享子、吉原哲、石井慎一、藤野聡司、山下鷹也、真弓あずさ、丸山聡、寺本昌弘、井上貴之、岡田昌也、玉置広哉、小川啓恭、藤盛好啓
    • Organizer
      第68回日本輸血・細胞治療学会学術総会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Unmanipulated haploidentical stem cell transplantation using low-dose ATG and steroid for high-risk diseases2020

    • Author(s)
      池亀和博
    • Organizer
      第42回日本造血細胞移植学会
    • Related Report
      2019 Research-status Report
    • Invited

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Published: 2018-04-23   Modified: 2022-01-27  

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