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Elucidation of Tumor Progression Mechanisms through Telomere Maintenance Mechanisms in Myxoid Liposarcoma

Research Project

Project/Area Number 19K16570
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 49020:Human pathology-related
Research InstitutionJapanese Foundation for Cancer Research

Principal Investigator

YAMASHITA Kyoko  公益財団法人がん研究会, 有明病院 病理部, 副医長 (50754975)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsテロメア維持機構 / 粘液型脂肪肉腫
Outline of Research at the Start

粘液型脂肪肉腫では、テロメア維持機構として、2次的にテロメラーゼ活性化とALT(テロメラーゼ非依存性テロメア伸長)の両方が生じうる。本研究では、免疫染色やPCR、FISH法などを用いて両方のテロメア維持機構、さらにその原因となる遺伝子変化について調査し、アレイCGHを用いて染色体異常の複雑性を評価する。原発巣と再発・転移巣の比較および予後や組織像との関連についてこれらの結果を解析することで、粘液型脂肪肉腫の腫瘍進展についてより包括的に理解することができ、予後予測に有用となるばかりでなく、他の融合遺伝子関連肉腫の進展様式を検討する際にも有用な情報を得られると考える。

Outline of Final Research Achievements

We performed a clinicopathological study and analyzed the mechanism of telomere maintenance in myxoid liposarcoma. Tumor size, FNCLCC grade, and necrosis were associated with prognosis, while hotspot mutations in the TERT promoter (C228T or C250T), which were observed in more than 70% of the cases, were not associated with prognosis. All of the hotspot mutation-negative cases also showed TERT mRNA expression, and seven cases (47%) of them showed the same level of TERT mRNA expression as the positive cases. Among the 19 cases without hotspot mutation, chromosomal rearrangements around TERT were observed in three cases, and mutations in other locations of the TERT promoter (A161C, C237G) were observed in two cases. In conclusion, TERT abnormalities in myxoid liposarcoma should not be a secondary phenomenon associated with malignancy, but may be an early event which would be important in tumorigenesis.

Academic Significance and Societal Importance of the Research Achievements

実験結果を総合すると、他の多くの腫瘍とは異なり、粘液型脂肪肉腫におけるTERT異常は、悪性度と関連するような2次的な現象ではなく、腫瘍発生の早期に生じ、腫瘍形成に重要な現象である可能性が考えられた。さらに、TERTプロモーターのhotspot変異以外にも、TERTプロモーターの別箇所での変異や、TERT付近での染色体再構成によってTERTの高発現をきたす機序を示した。腫瘍形成におけるTERTの役割について新たな観点が得られたとともに、TERT発現上昇をきたす分子機構についても明らかになった。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (11 results)

All 2023 2022 2021

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (7 results)

  • [Journal Article] Clinicopathologic and genetic characterization of angiofibroma of soft tissue: a study of 12 cases including two cases with <i>AHRR::NCOA3</i> gene fusion2023

    • Author(s)
      Yamashita Kyoko、Baba Satoko、Togashi Yuki、Dobashi Akito、Ae Keisuke、Matsumoto Seiichi、Tanaka Miwa、Nakamura Takuro、Takeuchi Kengo
    • Journal Title

      Histopathology

      Volume: 83 Issue: 1 Pages: 57-66

    • DOI

      10.1111/his.14899

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] High prevalence of TERT aberrations in myxoid liposarcoma: TERT reactivation may play a crucial role in tumorigenesis.2022

    • Author(s)
      Kunieda J, Yamashita K, Togashi Y, Baba S, Sakata S, Inamura K, Ae K, Matsumoto S, Machinami R, Kitagawa M, Takeuchi K.
    • Journal Title

      Cancer Science

      Volume: 113 Issue: 3 Pages: 1078-1089

    • DOI

      10.1111/cas.15256

    • Related Report
      2022 Research-status Report 2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] S100-negative epithelioid malignant peripheral nerve sheath tumor with possible perineurial differentiation2021

    • Author(s)
      Yamashita K, Funauchi Y, Hayakawa K, Ae K, Matsumoto S, Ikuta K, Nishida Y, Ueno T, Shimoyama Y, Hiruta N, Machinami R, Kawachi H, Takeuchi K
    • Journal Title

      Virchows Archiv

      Volume: Epub ahead of print. Issue: 6 Pages: 1269-1275

    • DOI

      10.1007/s00428-021-03218-y

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Prognostic significance of the MDM2/HMGA2 ratio and histological tumor grade in dedifferentiated liposarcoma2021

    • Author(s)
      Yamashita K, Kohashi K, Yamada Y, Akatsuka S, Ikuta K, Nishida Y, Toyokuni S, Oda Y.
    • Journal Title

      Genes Chromosomes Cancer

      Volume: 60 Issue: 1 Pages: 26-37

    • DOI

      10.1002/gcc.22899

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] TERTの融合遺伝子が認められた紡錘形細胞肉腫の2例.2022

    • Author(s)
      國枝純子, 山下享子, 土橋映仁, 阿江啓介, 松本誠一, 植野映子, 蛭田啓之, 町並陸生, 竹内賢吾.
    • Organizer
      第111回日本病理学会総会
    • Related Report
      2022 Research-status Report
  • [Presentation] 軟部血管線維腫の臨床病理学的検討.2022

    • Author(s)
      山下享子, 馬場郷子, 冨樫由紀, 阿江啓介, 松本誠一, 植野映子, 中村卓郎, 蛭田啓之, 町並陸生, 竹内賢吾.
    • Organizer
      第111回日本病理学会総会
    • Related Report
      2022 Research-status Report
  • [Presentation] 高度の多形性を示す孤立性線維性腫瘍の一例.2022

    • Author(s)
      山下享子, 國枝純子, 池畑浩一, 伊藤崇彦, 藤山淳三, 阿部仁, 谷澤泰介, 阿江啓介, 蛭田啓之, 杉山裕子.
    • Organizer
      第63回日本臨床細胞学会総会
    • Related Report
      2022 Research-status Report
  • [Presentation] 軟骨形成を伴う粘液型脂肪肉腫の1例.2022

    • Author(s)
      伊藤崇彦, 山下享子, 早川景子, 石井脩平, 山田麻里沙, 山崎奈緒子, 池畑浩一, 藤山淳三, 千葉知宏, 佐藤由紀子, 阿江啓介, 河内洋, 松本誠一, 阿部仁, 杉山裕子.
    • Organizer
      第61回日本臨床細胞学会秋期大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 軟部血管線維腫の臨床病理学的検討2022

    • Author(s)
      山下享子, 馬場郷子, 冨樫由紀, 阿江啓介, 松本誠一, 植野映子, 中村卓郎, 蛭田啓之, 町並陸生, 竹内賢吾.
    • Organizer
      第111回日本病理学会総会
    • Related Report
      2021 Research-status Report
  • [Presentation] TERTの融合遺伝子が認められた紡錘形細胞肉腫の2例.2022

    • Author(s)
      國枝純子, 山下享子, 土橋映仁, 阿江啓介, 松本誠一, 植野映子, 蛭田啓之, 町並陸生, 竹内賢吾
    • Organizer
      第111回日本病理学会総会
    • Related Report
      2021 Research-status Report
  • [Presentation] 粘液型脂肪肉腫におけるテロメア維持機構2021

    • Author(s)
      國枝純子, 山下享子, 阿江啓介, 河内洋, 竹内賢吾, 北川昌伸
    • Organizer
      第110回日本病理学会総会
    • Related Report
      2020 Research-status Report

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Published: 2019-04-18   Modified: 2025-01-30  

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