在177Lu-PSMA-617治疗后使用68Ga-PSMA-11 PET/CT评估PSMA受体的可用性
Molly E Roseland1, Kellen J Fitzpatrick1, Zhonglin Lu1
1Departments of Radiology.
Clinical nuclear medicine
|March 2, 2026
概括
177Lu-PSMA-617治疗前列腺癌导致PSMA蛋白结合的暂时减少. 瘤吸收药物在治疗后的早期显著减少,但随着时间的推移会恢复.
科学领域:
- 核医学是一种核医学.
- 放射性药物疗法是一种放射性药物疗法.
- 前列腺癌研究前列腺癌研究.
背景情况:
- 前列腺特异性膜抗原 (PSMA) 向放射性联体疗法,如177Lu-PSMA-617,是转移性割抗性前列腺癌的关键治疗方法.
- 177Lu-PSMA-617的有效性取决于它与癌细胞上的PSMA受体的结合.
- 治疗性放射性连体对PSMA受体的潜在和可能会影响随后的药物吸收和治疗的有效性.
研究的目的:
- 为了研究标准7.4GBq剂量的177Lu-PSMA-617对PSMA蛋白表达的药理效应.
- 在177Lu-PSMA-617治疗后使用PET成像量化68Ga-PSMA-11吸收的变化.
- 评估PSMA受体和和和治疗后恢复的时间进程.
主要方法:
- 六名患有转移性割抗性前列腺癌的患者接受了68Ga-PSMA-11 PET/CT扫描.
- 在多个时间点进行成像:基线,早期 (0.5-2小时),在第一个177Lu-PSMA-617治疗周期后晚期 (~3天).
- 在瘤和器官中标准化吸收值 (SUV平均值) 进行了基线和治疗后扫描之间的比较.
主要成果:
- 在治疗后早期扫描的患者中,观察到瘤SUV平均值显著平均下降45% (P<0.001).
- 早期的治疗后成像也显示了SUV平均值在脏,腺和肝脏中的显著减少.
- 相比之下,晚期的治疗后扫描显示,瘤SUV平均值仅略有持续下降 (平均值-9%,P=0.42),表明受体恢复.
结论:
- 服用177Lu-PSMA-617导致可测量的,PSMA结合的暂时减少,在大约三天内观察到恢复.
- 由于受体和动态,每周期增加治疗剂量可能不会比例地增加瘤吸收.
- 建议对更大的队列,标准化成像协议和药理动力学建模进行进一步的研究,以验证这些发现.
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