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2019 Fiscal Year Final Research Report

Quantitative evaluation of the intratumoral distribution of platinum in colorectal cancer via synchrotron radiation X-ray fluorescence spectrometry

Research Project

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Project/Area Number 18K16367
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

NAGAYOSHI Kinuko  九州大学, 大学病院, 助教 (90761015)

Project Period (FY) 2018-04-01 – 2020-03-31
Keywords大腸癌 / oxaliplatin / 白金製剤 / 治療抵抗性 / 治療効果予測 / 蛍光X線分析 / SPring-8
Outline of Final Research Achievements

The platinum-based chemotherapeutic drug oxaliplatin is a vital component of therapeutic regimens for colorectal cancer. The development of chemoresistance, however, is a major factor limiting its use. Here, to better understand the therapeutic efficacy of oxaliplatin, synchrotron radiation X-ray fluorescence (SR-XRF) analysis was used to investigate the intratumoral distribution of oxaliplatin in human colorectal cancer tissue. SR-XRF revealed high platinum concentration in the tumor stroma in tissues from patients with limited response to oxaliplatin therapy, indicating a correlation between stromal tissue platinum accumulation and oxaliplatin resistance. The findings further suggest that SR-XRF analysis can predict response to oxaliplatin-based therapy.

Free Research Field

医歯薬学

Academic Significance and Societal Importance of the Research Achievements

現時点ではoxaliplatinを用いた化学療法に対する治療反応性を予測する確実な手段は明らかでなく、有効性と安全性の高い化学療法を実現するためにも、最適な治療選択のための抗癌剤感受性予測マーカーの開発が必要である。
本研究では蛍光X線分析によって腫瘍組織中の薬物動態や細胞活性の変化を明らかにすることで、oxaliplatinを用いた化学療法に対する個々の治療反応性を予測する手段の確立と耐性獲得の機序の解明につなげ、治療効果の異なる組織中の薬物動態を工学的手法で得られた白金のスペクトルから明らかにすることで、これまで間接的にしか議論されていない治療反応性に科学的根拠をもたせることが可能になった。

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Published: 2021-02-19  

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