Abstract:
AIM:[Sc]Sc-PSMA-617 with 3.9-hour half-life, in vitro and in vivo characteristics similar to [Lu]Lu-PSMA-617 and possibility of delayed imaging after 24 hours or later, implies it to be advantageous than [ Ga]Ga-PSMA-617 for pretherapeutic dosimetric assessment for [Lu]Lu-PSMA-617 in metastatic castration-resistant prostate carcinoma (mCRPC) patients. In this study, we investigated biodistribution and radiation exposure to normal organs with [Sc]Sc-PSMA-617 in mCRPC patients. METHODS:Five mCRPC patients (mean age, 69 years) enrolled for [Lu]Lu-PSMA-617 therapy were injected with 40-62 MBq [Sc]Sc-PSMA-617 intravenously; Siemens Biograph 2 PET/CT system was used to acquire dynamic PET data (30 minutes) in list mode over the abdomen, followed by the collection of static PET/CT images (skull to mid-thigh) at 45 minutes, 2 and approximately 20 hours postinjection. Time-dependent changes in percentage activity in source organs (kidneys, bladder, salivary glands, small intestine, liver, spleen, and whole body) were determined. Bone marrow and urinary bladder contents residence time were also calculated. Source organs residence time, organ-absorbed doses, and effective doses were determined using OLINDA/EXM software. RESULTS:Physiological tracer uptake was seen in kidneys, liver, spleen, small intestine, urinary bladder, and salivary glands and in metastases. Kidneys with highest radiation absorbed dose of 3.19E-01 mSv/MBq were the critical organs, followed by urinary bladder wall (2.24E-01 mSv/MBq, spleen [1.85E-01], salivary glands [1.11E-01], and liver [1.07E-01] mSv/MBq). Red marrow dose was found to be 3.31E-02 mSv/MBq. The mean effective dose of 3.89E-02 mSv/MBq and effective dose of 1.95 mSv was estimated from 50 MBq (treatment planning dose) of [Sc]Sc-PSMA-617. CONCLUSIONS:[Sc]Sc-PSMA-617 is found to be a very promising radiopharmaceutical that can be used for pre [Lu]Lu-PSMA-617 therapeutic dosimetric assessment.
journal_name
Clin Nucl Medjournal_title
Clinical nuclear medicineauthors
Khawar A,Eppard E,Sinnes JP,Roesch F,Ahmadzadehfar H,Kürpig S,Meisenheimer M,Gaertner FC,Essler M,Bundschuh RAdoi
10.1097/RLU.0000000000002003subject
Has Abstractpub_date
2018-05-01 00:00:00pages
323-330issue
5eissn
0363-9762issn
1536-0229journal_volume
43pub_type
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journal_title:Clinical nuclear medicine
pub_type: 杂志文章
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journal_title:Clinical nuclear medicine
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journal_title:Clinical nuclear medicine
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journal_title:Clinical nuclear medicine
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journal_title:Clinical nuclear medicine
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journal_title:Clinical nuclear medicine
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journal_title:Clinical nuclear medicine
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journal_title:Clinical nuclear medicine
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journal_title:Clinical nuclear medicine
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journal_title:Clinical nuclear medicine
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journal_title:Clinical nuclear medicine
pub_type: 杂志文章
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journal_title:Clinical nuclear medicine
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journal_title:Clinical nuclear medicine
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journal_title:Clinical nuclear medicine
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