Yang Q, Zhu W, Ren C, Ji H, Wang D, Liu Y, Li F, Du Y, Liu Y, Huo L. Biodistribution and radiation dosimetry of D-isomer of 4-borono-2-[
18F]fluoro-phenylalanine: A comparative PET/CT study with L-isomer in healthy human volunteers.
Nucl Med Biol 2021;
94-95:32-37. [PMID:
33486437 DOI:
10.1016/j.nucmedbio.2020.12.006]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Revised: 12/19/2020] [Accepted: 12/22/2020] [Indexed: 11/29/2022]
Abstract
INTRODUCTION
L-isomer of 4-borono-2-18F-fluoro-phenylalanine (L-[18F]FBPA) was generally applied in clinic for boron neutron capture therapy (BNCT). With radiotracer validation, D-isomer of [18F]FBPA (D-[18F]FBPA) was found a higher tumor to normal brain tissue ratio (TBR) than its L-isomer on positron emission tomography (PET) in rat brain glioma. The present study was conducted as a first-in-human study to explore the biodistribution and radiation dosimetry of D-[18F]FBPA in healthy human volunteers, compared with L-[18F]FBPA.
METHODS
D-[18F]FBPA or L-[18F]FBPA was injected intravenously. Five whole-body PET scans were performed for each subject in the next 2 h. Organ time-activity curves were drawn by measuring SUVmean in volumes of interest. Absorbed dose coefficient of target organs and effective dose (ED) were estimated on OLINDA/EXM.
RESULTS
Two healthy volunteers (both males) and three healthy volunteers (2 males, 1 female) were intravenously injected with D-[18F]FBPA (5.5-7.2 MBq/kg) and L-[18F]FBPA (3.9-6.8 MBq/kg) respectively. Only limited accumulation of D-[18F]FBPA was observed in healthy human brain, pancreas, liver, spleen and skeleton. The ED was calculated to be 0.026 mSv/MBq. Urinary bladder wall received the highest dose of 0.28 mGy/MBq, followed by kidneys (0.06 mGy/MBq), and all the other organs received less than 0.03 mGy/MBq. For L-[18F]FBPA, higher uptake in brain, pancreas, liver, spleen and skeleton could be visualized, compared with D-[18F]FBPA. The ED of L-[18F]FBPA was 0.020 ± 0.001 mSv/MBq. Urinary bladder wall and kidneys still received the highest dose among organs but with lower values than those of D-[18F]FBPA.
CONCLUSIONS
D-[18F]FBPA had lower activity in normal brain, liver, spleen, pancreas and skeleton, compared with its L-isomer. D-[18F]FBPA is safe from a radiological standpoint.
ADVANCES IN KNOWLEDGE AND IMPLICATIONS FOR PATIENT CARE
D-[18F]FBPA was safe from a radiological standpoint, and had lower activity in normal brain, liver, spleen, pancreas and skeleton than its L-isomer. This study ensures the safety and validity of D-[18F]FBPA for further clinical trials in patients with cancer.
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