膠原腫における超変異のメカニズムと治療的影響
Mehdi Touat1,2,3, Yvonne Y Li4,5, Adam N Boynton4,6
1Department of Oncologic Pathology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA. mehdi.touat@gmail.com.
Nature
|April 24, 2020
まとめ
高腫瘍変異負荷は,DNA修復の欠陥から生じる. 化学療法によって 超変異が起こりますが 攻撃的な脳腫瘍では 免疫療法による反応は改善されません
科学分野:
- 腫瘍学
- 遺伝学
- 癌 研究
背景:
- 高度な腫瘍変異負荷 (ハイパー変異) がグリオマで観察されています.
- 超変異の発症のメカニズムと免疫療法への反応との関連は十分に理解されていません.
研究 の 目的:
- 10,294のグリオマの変異負荷とシグネチャーの 分子決定因子を包括的に分析する.
- 膠原腫の高変異につながる経路とその治療反応への影響を理解する.
主な方法:
- 変異負荷とシグネチャの分子決定因子の分析 10,294のグリオマ.
- MMR欠乏細胞におけるテモゾロミド誘発損傷を用いた変異シグネチャーの実験再現.
- マイクロサテライト変異を特定するために単細胞全ゲノムシーケンシング.
主要な成果:
- 2つの主要なハイパー変異経路が特定された: de novo (DNAポリメラーゼ/MMR遺伝子欠陥) と治療後の (テモゾロミド後に獲得されたMMR欠陥).
- MMR欠乏性膠原腫はT細胞の浸透が欠如し,異質性が高く,生存率が低く,PD-1阻害に対する反応が低い.
- マイクロサテライト変異は,単細胞配列解析により,治療後の高変異性膠腫細胞で特定されました.
結論:
- 化学療法により,高変異性膠原菌群の獲得を促すことができる.
- 化学療法による超変異はPD- 1 阻害免疫療法に対する反応を高めません.
- 変異負荷とシグネチャーは 癌の診断に役立つツールです
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