J Nucl Med:177 Lu-PSMA-617在转移性去势抵抗性前列腺癌中的剂量测定

2020-04-22 MedSci原创 MedSci原创

177

177Lu-前列腺特异性膜抗原(PSMA)-617可以将β粒子辐射靶向递送至前列腺癌。本文旨在确定了它的辐射剂量以及与治疗前成像和结果的关系。

 

在一项前瞻性临床试验(ACTRN12615000912583)中,研究人员探究了30例接受177Lu-PSMA-617的前列腺癌患者。筛查68Ga-PSMA-11 PET/CT在所有患者中均显示出高PSMA表达。治疗后,患者在4、24和96小时接受定量SPECT/CT检查。计算体素水平的药代动力学摄取和清除,并使用体素S值将其转化为吸收剂量。在正常组织和肿瘤上绘制感兴趣的体积以评估放射剂量,并确定全身肿瘤的剂量。分析了PSMA PET/CT参数,剂量测定以及生化和治疗反应之间的相关性,以确定吸收剂量,肿瘤负荷和患者生理之间的关系。

 

结果显示,肾脏、下颌下腺和腮腺、肝脏、脾脏和骨髓的平均吸收剂量分别为0.39、0.44、0.58、0.1、0.06和0.11 Gy/MBq。中位全身肿瘤吸收剂量为11.55 Gy,与12周时的前列腺特异性抗原(PSA)反应相关。PSA下降至少50%的患者的平均剂量为14.1 Gy,而PSA下降小于50%的患者的平均剂量为9.6 Gy(P <0.01)。在接受小于10 Gy肿瘤剂量的11例患者中,只有1例获得了至少50%的PSA反应。在筛选PSMA PET时,全身肿瘤SUVmean与平均吸收剂量相关(r = 0.62),腮腺SUVmax与吸收剂量相关(r = 0.67)。腮腺的肿瘤体积与平均剂量(r = -0.41)和肾脏的平均剂量之间呈负相关(r = -0.43)。腮腺平均剂量也随着体重增加(r = -0.41)和体表面积(r = -0.37)而降低。

 

综上所述,该研究结果表明,177Lu-PSMA-617对肿瘤具有高吸收剂量,而全身肿瘤剂量与PSA反应之间存在明显相关性。少于10 Gy的患者不太可能使PSA降低至少50%。观察到了68Ga-PET/CT筛查与肿瘤和正常组织剂量之间的显着相关性,为针对患者的特定剂量提供了依据。在肿瘤负荷较高的患者中,唾液和肾脏的剂量降低。腮腺剂量也随着体重和体表面积的增加而减少。

 

原始出处:

 

John VioletPrice Jackson, et al., Dosimetry of 177 Lu-PSMA-617 in Metastatic Castration-Resistant Prostate Cancer: Correlations Between Pretherapeutic Imaging and Whole-Body Tumor Dosimetry With Treatment Outcomes. J Nucl Med. 2019 Apr;60(4):517-523. doi: 10.2967/jnumed.118.219352. Epub 2018 Oct 5.

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    2020-07-15 yige2012
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    2021-02-21 丁鹏鹏
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    2020-04-24 江川靖瑶
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    2020-04-24 智慧医人
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    2020-04-23 misszhang

    前列腺癌相关研究,学习了,谢谢梅斯

    0

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