Abstract
Purpose
18F-fluoromisonidazole (18F-FMISO) is the most widely used positron emission tomography (PET) tracer for imaging tumor hypoxia. Previous reports suggested that the time from injection to the scan may affect the assessment of 18F-FMISO uptake. Herein, we directly compared the images at 2 h and 4 h after a single injection of 18F-FMISO.
Methods
Twenty-three patients with or suspected of having a brain tumor were scanned twice at 2 and 4 h following an intravenous injection of 18F-FMISO. We estimated the mean standardized uptake value (SUV) of the gray matter and white matter and the gray-to-white matter ratio in the background brain tissue from the two scans. We also performed a semi-quantitative analysis using the SUVmax and maximum tumor-to-normal ratio (TNR) for the tumor.
Results
At 2 h, the SUVmean of gray matter was significantly higher than that of white matter (median 1.23, interquartile range (IQR) 1.10–1.32 vs. 1.04, IQR 0.95–1.16, p < 0.0001), whereas at 4 h, it significantly decreased to approach that of the white matter (1.10, IQR 1.00–1.23 vs. 1.02, IQR 0.93–1.13, p = NS). The gray-to-white matter ratio thus significantly declined from 1.17 (IQR 1.14–1.19) to 1.09 (IQR 1.07–1.10) (p < 0.0001). All 7 patients with glioblastoma showed significant increases in the SUVmax (2.20, IQR 1.67–3.32 at 2 h vs. 2.65, IQR 1.74–4.41 at 4 h, p = 0.016) and the TNR (1.75, IQR 1.40–2.38 at 2 h vs. 2.34, IQR 1.67–3.60 at 4 h, p = 0.016).
Conclusion
In the assessment of hypoxic tumors, 18F-FMISO PET for hypoxia imaging should be obtained at 4 h rather than 2 h after the injection.
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Acknowledgments
We thank the staff members of the Department of Nuclear Medicine, the Central Institute of Isotope Science, the Department of Cancer Pathology, Hokkaido University, and the Department of Radiology, Hokkaido University Hospital, for their support of this work.
Funding
This research was supported in part by a Grant-in-Aid for General Scientific Research from the Japan Society for the Promotion of Science (Ko.Ke., 19K17127).
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All procedures involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the principles of the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. A portion of our results were presented at the SNMMI 2018 Conference (J Nucl Med May 1, 2015, vol. 56 no. supplement 3373).
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Kobayashi, K., Manabe, O., Hirata, K. et al. Influence of the scan time point when assessing hypoxia in 18F-fluoromisonidazole PET: 2 vs. 4 h. Eur J Nucl Med Mol Imaging 47, 1833–1842 (2020). https://doi.org/10.1007/s00259-019-04626-8
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DOI: https://doi.org/10.1007/s00259-019-04626-8