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Updated: Jun 14, 2025

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辐射暴露,骨髓功能通过F-氨基胺正子发射断层扫描测量,以及非小细胞肺癌化疗期间的淋巴细胞计数之间的剂量反应关系

Michael P MacManus¹, Elizabeth Prins², Jing Xie³

¹Department of Radiation Oncology, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia; The Sir Peter MacCallum Department of Oncology, The University of Melbourne, Melbourne, Victoria, Australia.

International journal of radiation oncology, biology, physics

|September 5, 2024

概括

在癌症治疗期间的低剂量辐射显著降低了骨髓 (BM) 扩散. 将BM暴露于≥3 Gy的最小化可能会保存淋巴细胞,这对免疫疗法的有效性至关重要.

科学领域:

在瘤学瘤学.
核医学就是核医学.
辐射疗法辐射疗法

背景情况:

F-胺胺 (FLT) 定子发射断层扫描 (PET) 是用于成像骨髓 (BM) 增殖的敏感工具.
顺序FLT-PET/计算机断层扫描 (CT) 扫描可以评估癌症治疗期间辐射对BM的影响.

研究的目的:

通过重新设计的FLT-PET/CT扫描来研究辐射和骨髓增殖之间的剂量反应关系.
评估化学辐射疗法 (CRT) 对非小细胞肺癌 (NSCLC) 患者骨髓增殖的影响.

主要方法:

26名NSCLC患者在基线,第2周 (20 Gy) 和第4周 (40 Gy) 接受了CRT与FLT-PET/CT扫描.
在BM中FLT吸收与辐射剂量分布相关,使用专门的软件进行了分析.
没有FLT吸收的BM体积的百分比 (ablated) 通过比较随时间的扫描来计算.

主要成果:

暴露于≥3 Gy的骨髓增殖区域在第2周显示出显著的FLT吸收移除.
在2周后的累积剂量≥3-4 Gy和4周后的≥4-5 Gy后,BM增殖减少了>95%.
从第2周到第4周,消去的BM体积增加,淋巴细胞数量显著下降,与消去的BM体积相关.

结论:

在CRT期间低剂量辐射暴露导致了显著的骨髓切除.
骨髓是潜在的危险器官;减少暴露于≥3 Gy可能有助于保存淋巴细胞.
保护淋巴细胞对于辅助免疫治疗的有效性至关重要.

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