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An Automated Radiosynthesis of [68Ga]Ga-FAPI-46 for Routine Clinical Use
Published on: May 24, 2024
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使用正子发射断层扫描对FAP表达的非侵入性成像:对含有糖的[18F]标记的FAPI与[18F]FAPI-42进行比较评估
Jiawen Huang1, LiLan Fu1, XiaoJun Zhang1
1GDMPA Key Laboratory for Quality Control and Evaluation of Radiopharmaceuticals, PET Center and Department of Nuclear Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China.
概括
与[18F]FAPI-42.2相比,一种新的纤维细胞激活蛋白 (FAP) 向性追踪剂[18F]FAPT显示了针对癌症的改善PET成像. 这种新型的追踪剂提供了更高的瘤吸收率和更好的特异性,特别是在胆道系统癌症中.
科学领域:
- 核医学就是核医学.
- 放射化学 放射化学是指辐射化学.
- 在瘤学瘤学.
背景情况:
- 纤维细胞激活蛋白 (FAP) 向抑制剂 (FAPI) 对于癌症成像和放射治疗至关重要.
- [68Ga]GaFAPI-04和[18F]FAPI-42是FAP的定子发射断层扫描 (PET) 已确定的追踪剂,但具有诸如高胆汁吸收和不稳定的胰腺吸收等局限性.
- 这些局限性阻碍了有效的腹部瘤PET成像.
研究的目的:
- 开发和评估一种新型的[18F]标记的含有糖的FAPI追踪剂,命名为[18F]FAPT.
- 评估[18F]FAPT在各种癌症中FAP表达的PET成像中的有效性.
- 为了将[18F]FAPT与现有的标记器[18F]FAPI-42.2进行比较.
主要方法:
- [18F]FAPT的合成 (手动和自动化).
- 使用A549-FAP细胞进行竞争性结合,细胞内化和排泄的体外评估.
- 在A549-FAP和U87MG异种移植小鼠模型中的体内研究使用MicroPET和生物分布,与[18F]FAPI-42相比.
- 在5名健康志愿者和3名癌症患者中进行临床PET/CT扫描.
主要成果:
- [18F]FAPT证明了与FAP的特定结合,具有有利的药理动力学.
- 与[18F]FAPI-42相比,[18F]FAPT表现出更好的水友性,更低的胆汁吸收,更高的瘤吸收和更长的瘤保留.
- 人类的生物分布显示正常组织 (胰腺,甲状腺,唾液腺除外) 的吸收率较低,导致高瘤与背景比率.
结论:
- [18F]FAPT是一种优于[18F]FAPI-42的PET追踪剂,用于成像胆道系统癌症.
- 这种追踪器有可能在各种癌症中评估FAP表达,并增强瘤与背景比率.
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