增加氧气度对小鼠FLASH节约效应的影响是取决于组织的
A Sesink1,2, L Soutter1,2, R Geyer1,2
1Department of Radiation Oncology, Lausanne University Hospital and Lausanne University, Lausanne, Switzerland.
The British journal of radiology
|December 3, 2025
概括
补充氧气消除了FLASH放射治疗在胃肠道中的节约作用,但在皮肤上保留了它. 这种取决于组织的效应凸显了传统放射治疗和FLASH放射治疗之间的氧气增强比率的差异.
科学领域:
- 辐射瘤学 辐射瘤学
- 临床前研究 临床前研究
- 放射生物学的放射生物学
背景情况:
- 以前的研究表明,在补充氧气下,FLASH放射治疗的毒性增加.
- 之前没有量化FLASH节约效应与氧气的变化大小.
- 正常组织并发症概率 (NTCP) 对于放射治疗规划至关重要.
研究的目的:
- 在FLASH和常规放射治疗 (CONV) 期间,研究氧气呼吸对NTCP在小鼠模型中的影响.
- 为了量化FLASH节约效应在增加组织氧化率下变化的幅度.
- 为了比较CONV和FLASH放射治疗之间的氧气增强比率 (OER).
主要方法:
- 用CONV和FLASH辐射对小鼠模型 (C57BL/6和BALB/c) 进行了剂量升级实验.
- 在空气和氧气呼吸条件下确定了NTCP曲线,用于腹部和皮肤辐射.
- 使用光火测量了组织氧化度;计算了FLASH剂量修改因子 (DMF).
主要成果:
- 在空气下,腹部辐射显示出显著的FLASH节约效应 (DMF=1.14) ,在氧气下 (DMF=1.00).
- 在空气下,皮肤辐射显示出强烈的FLASH节约效应 (DMF=1.42),在氧气下很大程度上保持 (DMF=1.40).
- 氧气呼吸显著增加了肠道和皮肤的组织氧化.
结论:
- 在增加氧化的情况下,FLASH节约效应的保存是组织依赖的.
- 研究结果表明,CONV和FLASH放射治疗之间的OER曲线可能存在差异.
- 这项研究使用动物模型首次量化了FLASH节约效应在增加组织氧化时的变化.
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