Biodistribution and Radiation Dosimetry of Deuterium-Substituted 18F-Fluoromethyl-[1, 2-2H4]Choline in Healthy Volunteers

被引:22
作者
Challapalli, Amarnath [1 ]
Sharma, Rohini [2 ]
Hallett, William A. [3 ]
Kozlowski, Kasia [1 ]
Carroll, Laurence [1 ]
Brickute, Diana [1 ]
Twyman, Frazer [1 ]
Al-Nahhas, Adil [4 ]
Aboagye, Eric O. [1 ]
机构
[1] Univ London Imperial Coll Sci Technol & Med, Dept Surg & Canc, London W12 ONN, England
[2] Univ London Imperial Coll Sci Technol & Med, Dept Expt Med, London W12 ONN, England
[3] Imanova Ctr Imaging Sci, London, England
[4] Imperial Coll Healthcare NHS Trust, Dept Radiol Nucl Med, London, England
基金
英国工程与自然科学研究理事会; 英国医学研究理事会;
关键词
F-18-D4-FCH; biodistribution; dosimetry; POSITRON-EMISSION-TOMOGRAPHY; PROSTATE-CANCER; CHOLINE KINASE; GLIOMA-CELLS; PET; METABOLISM; BETAINE; TRACER; F-18;
D O I
10.2967/jnumed.113.129577
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
C-11-choline and F-18-fluoromethylcholine (F-18-FCH) have been used in patients to study tumor metabolic activity in vivo; however, both radiotracers are readily oxidized to respective betaine analogs, with metabolites detectable in plasma soon after injection of the radiotracer. A more metabolically stable FCH analog, F-18-fluoromethyl[1,2-H-2(4)] choli ne (F-18-D4-FCH), based on the deuterium isotope effect, has been developed. We report the safety, biodistribution, and internal radiation dosimetry profiles of F-18-D4-FCH in 8 healthy human volunteers. Methods: F-18-D4-FCH was intravenously administered as a bolus injection (mean +/- SD, 161 +/- 2.17 MBq; range, 156-163 MBq) to 8 healthy volunteers (4 men, 4 women). Whole-body (vertex to mid thigh) PET/CT scans were acquired at 6 time points, up to 4 h after tracer injection. Serial whole-blood, plasma, and urine samples were collected for radioactivity measurement and plasma radiotracer metabolites. Tissue F-18 radioactivities were determined from quantitative analysis of the images, and time-activity curves were generated. The total numbers of disintegrations in each organ normalized to injected activity (residence times) were calculated as the area under the curve of the time-activity curve normalized to injected activities and standard organ volumes. Dosimetry calculations were performed using OLINDA/EXM 1.1. Results: The injection of F-18-D4-FCH was well tolerated in all subjects, with no radiotracer-related serious adverse event reported. The mean effective dose averaged over both men and women (+/- SD) was estimated to be 0.025 +/- 0.004 (men, 0.022 +/- 0.002; women, 0.027 +/- 0.002) mSv/MBq. The 5 organs receiving the highest absorbed dose (mGy/MBq) were the kidneys (0.106 +/- 0.03), liver (0.094 +/- 0.03), pancreas (0.066 +/- 0.01), urinary bladder wall (0.047 +/- 0.02), and adrenals (0.046 +/- 0.01). Elimination was through the renal and hepatic systems. Conclusion: F-18-D4-FCH is a safe PET radiotracer with a dosimetry profile comparable to other common F-18 PET tracers. These data support the further development of F-18-D4-FCH for clinical imaging of choline metabolism.
引用
收藏
页码:256 / 263
页数:8
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