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EJNMMI Research
Published in: EJNMMI Research 1/2014

Open Access 01-12-2014 | Original research

FBPA PET in boron neutron capture therapy for cancer: prediction of 10B concentration in the tumor and normal tissue in a rat xenograft model

Authors: Kohei Hanaoka, Tadashi Watabe, Sadahiro Naka, Yasukazu Kanai, Hayato Ikeda, Genki Horitsugi, Hiroki Kato, Kayako Isohashi, Eku Shimosegawa, Jun Hatazawa

Published in: EJNMMI Research | Issue 1/2014

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Abstract

Background

Boron neutron capture therapy (BNCT) is a molecular radiation treatment based on the 10B (n, α) 7Li nuclear reaction in cancer cells, in which delivery of 10B by 4-borono-phenylalanine conjugated with fructose (BPA-fr) to the cancer cells is of critical importance. The PET tracer 4-borono-2-18 F-fluoro-phenylalanine (FBPA) has been used to predict the accumulation of BPA-fr before BNCT. However, because of the difference in chemical structure between BPA-fr and FBPA and the difference in the dose administered between BPA-fr (therapeutic dose) and FBPA (tracer dose), the predictive value of FBPA PET for BPA-fr accumulation in the tumor and normal tissues is not yet clearly proven. We conducted this study to validate FBPA PET as a useful test to predict the accumulation of BPA-fr in the tumor and normal tissues before BNCT.

Methods

RGC-6 rat glioma cells (1.9 × 107) were implanted subcutaneously in seven male F344 rats. On day 20 after the tumor implantation, dynamic PET scan was performed on four rats after injection of FBPA for 1 h. Whole-body PET/CT was performed 1 h after intravenous injection of the FBPA solution (30.5 ± 0.7 MBq, 1.69 ± 1.21 mg/kg). PET accumulation of FBPA in the tumor tissue and various normal tissues was estimated as a percentage of the injected dose per gram (%ID/g). One hour after the PET/CT scan, BPA-fructose (167.32 ± 18.65 mg/kg) was injected intravenously, and the rats were dissected 1 h after the BPA-fr injection. The absolute concentration of 10B in the autopsied tissues and blood was measured by inductively coupled plasma optical emission spectrometry (ICP-OES).

Results

The highest absolute concentration of 10B determined by ICP-OES was found in the kidney (4.34 ± 0.84 %ID/g), followed by the pancreas (2.73 ± 0.63 %ID/g), and the tumor (1.44 ± 0.44 %ID/g). A significant positive correlation was found between the accumulation levels of BPA-fr and FBPA (r = 0.91, p < 0.05).

Conclusions

FBPA PET can reliably predict accumulation of BPA-fr in the tumor as well as normal tissues.
Appendix
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Metadata
Title
FBPA PET in boron neutron capture therapy for cancer: prediction of 10B concentration in the tumor and normal tissue in a rat xenograft model
Authors
Kohei Hanaoka
Tadashi Watabe
Sadahiro Naka
Yasukazu Kanai
Hayato Ikeda
Genki Horitsugi
Hiroki Kato
Kayako Isohashi
Eku Shimosegawa
Jun Hatazawa
Publication date
01-12-2014
Publisher
Springer Berlin Heidelberg
Published in
EJNMMI Research / Issue 1/2014
Electronic ISSN: 2191-219X
DOI
https://doi.org/10.1186/s13550-014-0070-2

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