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Treatment Response Assessment of Skeletal Metastases in Prostate Cancer with 18F-NaF PET/CT

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Abstract

Purpose

To determine the utility of 18F-sodium fluoride positron emission tomography-computed tomography (18F-NaF PET/CT) in the imaging assessment of therapy response in men with osseous-only metastatic prostate cancer.

Methods

In this Institutional Review Board–approved single institution retrospective investigation, we evaluated 21 18F-NaF PET/CT scans performed in 14 patients with osseous metastatic disease from prostate cancer and no evidence of locally recurrent or soft-tissue metastatic disease who received chemohormonal therapy. Imaging-based qualitative and semi-quantitative parameters were defined and compared with changes in serum PSA level.

Results

Qualitative and semi-quantitative image-based assessments demonstrated > 80% concordance with good correlation (SUVmax κ = 0.71, SUVavg κ = 0.62, SUVsum κ = 0.62). Moderate correlation (κ = 0.43) was found between SUVmax and PSA-based treatment response assessments. There was no statistically significant correlation between PSA-based disease progression and semi-quantitative parameters. Qualitative imaging assessment was moderately correlated (κ = 0.52) with PSA in distinguishing responders and non-responders.

Conclusion

18F-NaF PET/CT is complementary to biochemical monitoring in patients with bone-only metastases from prostate cancer which can be helpful in subsequent treatment management decisions.

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Abbreviations

CT:

computed tomography

PET:

positron emission tomography

PSA:

prostate-specific antigen

MDP:

methylene diphosphonate

NaF:

sodium fluoride

P:

progressor

NP:

non-progressor

R:

responder

NR:

non-responder

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Funding

We acknowledge National Institutes of Health grants R01-CA111613 (PI: H. Jadvar) and P30-CA014089 (USC Norris Comprehensive Cancer Center).

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Correspondence to Hossein Jadvar.

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Conflict of Interest

Erik M. Velez, Bhushan Desai, and Hossein Jadvar declare no conflicts of interest. There was no direct funding for this study.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the study.

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Velez, E.M., Desai, B. & Jadvar, H. Treatment Response Assessment of Skeletal Metastases in Prostate Cancer with 18F-NaF PET/CT. Nucl Med Mol Imaging 53, 247–252 (2019). https://doi.org/10.1007/s13139-019-00601-1

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  • DOI: https://doi.org/10.1007/s13139-019-00601-1

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