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The Clinical Validity of Urinary Pellet DNA Monitoring for the Diagnosis of Recurrent Bladder Cancer

Research Project

Project/Area Number 22K09457
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 56030:Urology-related
Research InstitutionIwate Medical University

Principal Investigator

Tsuyukubo Takashi  岩手医科大学, 医学部, 非常勤医師 (50899359)

Co-Investigator(Kenkyū-buntansha) 西塚 哲  岩手医科大学, 医歯薬総合研究所, 特任教授 (50453311)
小原 航  岩手医科大学, 医学部, 教授 (90337155)
Project Period (FY) 2022-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2024: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords膀胱癌 / バイオマーカー / 尿中DNA / 遺伝子変異 / 再発早期予測 / 治療効果判定 / 無再発の確認 / dPCR / 早期再発診断
Outline of Research at the Start

膀胱癌診療における課題のひとつとして、再発診断のバイオマーカーに乏しい点が挙げられる。高リスク膀胱癌は初期治療後に約75%の症例で再発を生じる。一方、術後評価の膀胱鏡検査は侵襲度が高く、尿細胞診検査は感度が低いといった問題がある。
近年、癌患者の体液中にCirculating tumor DNA(ctDNA)が検出されることが知られ、再発早期予測や治療効果判定のバイオマーカーとしての有用性が期待されている。本研究は、高リスク膀胱癌患者を対象に、腫瘍毎に検出した遺伝子変異に対して、血漿ならびに尿沈渣中DNAをdigital PCR (dPCR)で高感度に検出、モニタリングする前向き観察研究である。

Outline of Final Research Achievements

The aim of this study is to evaluate the clinical validity of using urine pellet DNA (upDNA), monitored by digital PCR (dPCR), as a new biomarker for early recurrence detection in bladder cancer (BC). Patient-specific mutations were monitored by dPCR in upDNA. In 32 patients, dPCR was performed at a mean of 7.2 time points (range: 2-12) for longitudinal monitoring. Clinical recurrence was assessed by imaging and urine cytology and was compared to trends in upDNA variant allele frequency (VAF). A continuously increasing upDNA VAF reaching 1% was defined as molecular recurrence. At least one somatic mutation was traceable in 30 of 32 cases (93.8%). Among 7 cases with clinical recurrence, 5 (71.4%) showed elevated upDNA VAF more than 7 months before clinical diagnosis. upDNA monitoring demonstrated clinical validity in 26 of 30 evaluable cases (86.7%). These findings support upDNA monitoring as a sensitive and practical tool for managing bladder cancer recurrence.

Academic Significance and Societal Importance of the Research Achievements

本研究では、膀胱がんの再発を尿に含まれるDNA(upDNA)から高い精度で早期に検出できる方法を開発した。特定の遺伝子変異をデジタルPCRという技術で追跡することで、通常の画像検査よりも数か月早く再発の兆候を捉えられる可能性が示された。これは、一人ひとりの病状に応じた治療判断を支える新たな手段となりうる。再発の早期発見が進めば、治療の効果を高め、患者の負担を減らすとともに、医療資源の効率的な活用にもつながると期待される。

Report

(4 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • Research Products

    (8 results)

All 2024 2023 2022

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

  • [Journal Article] The Clinical Validity of Urinary Pellet DNA Monitoring for the Diagnosis of Recurrent Bladder Cancer2024

    • Author(s)
      Abe Masakazu、Hiraki Hayato、Tsuyukubo Takashi、Ono Sadahide、Maekawa Shigekatsu、Tamura Daichi、Yashima-Abo Akiko、Kato Renpei、Fujisawa Hiromitsu、Iwaya Takeshi、Park Woong-Yang、Idogawa Masashi、Tokino Takashi、Obara Wataru、Nishizuka Satoshi S.
    • Journal Title

      The Journal of Molecular Diagnostics

      Volume: 26 Issue: 4 Pages: 278-291

    • DOI

      10.1016/j.jmoldx.2024.01.006

    • Related Report
      2024 Annual Research Report 2023 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 膀胱癌再発診断における血漿および尿沈渣変異DNAモニタリングの臨床的妥当性2023

    • Author(s)
      阿部 正和、開 勇人、露久保 敬嗣、西塚 哲
    • Organizer
      第7回 リキッドバイオプシー研究会
    • Related Report
      2023 Research-status Report
  • [Presentation] The clinical validity of urinary pellet DNA monitoring of recurrent bladder cancer2023

    • Author(s)
      Masakazu Abe, Hayato Hiraki, Takashi Tsuyukubo, Satoshi Nishizuka
    • Organizer
      American Association for Cancer Research
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] The clinical validity of urinary pellet DNA monitoring of recurrent bladder cancer2023

    • Author(s)
      阿部 正和
    • Organizer
      American Association for Cancer Research 2023 Annual Meeting
    • Related Report
      2022 Research-status Report
  • [Presentation] The clinical validity of urinary pellet DNA monitoring of recurrent bladder cancer2023

    • Author(s)
      阿部 正和
    • Organizer
      日本泌尿器科学会総会
    • Related Report
      2022 Research-status Report
  • [Presentation] Clinical validity of plasma and urinary pellet DNA monitoring for the diagnosis of recurrent bladder cancer2022

    • Author(s)
      阿部 正和
    • Organizer
      日本癌学会学術総会
    • Related Report
      2022 Research-status Report
  • [Patent(Industrial Property Rights)] 膀胱癌に関連した変異DNAの分析方法、並びにそのためのデジタルPCR用プライマー及びプローブ2022

    • Inventor(s)
      西塚 哲、阿部 正和
    • Industrial Property Rights Holder
      西塚 哲、阿部 正和
    • Industrial Property Rights Type
      特許
    • Filing Date
      2022
    • Related Report
      2023 Research-status Report
  • [Patent(Industrial Property Rights)] 膀胱癌に関連した変異DNAの分析方法、並びにそのためのデジタルPCR用プライマー及びプローブ2022

    • Inventor(s)
      西塚 哲、阿部 正和
    • Industrial Property Rights Holder
      西塚 哲、阿部 正和
    • Industrial Property Rights Type
      特許
    • Filing Date
      2022
    • Related Report
      2022 Research-status Report

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Published: 2022-04-19   Modified: 2026-01-16  

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