Abstract
Purpose
The optimal number of lesions to measure for response assessment from fluorine-18 fluorodeoxyglucose (18F-FDG) positron emission tomography (PET)/computed tomography (CT) is not validated for lung cancer. We compared 1 lesion and up-to-5 lesion measurements for response assessment in lung cancer per PET Response Criteria in Solid Tumors (PERCIST).
Methods
Patients with lung cancer with pre- and post-treatment PET/CT images were included. The standard uptake value corrected for lean body mass (SULpeak) of up-to-5 hottest target lesions was measured at each time point. The percent changes of SULpeak of the single hottest lesion and the sum of up-to-5 hottest lesions were computed. Pearson correlation coefficient evaluated the strength of association between the percent changes of SULpeak values from the 1 lesion and up-to-5 lesion analyses. Response categories were complete metabolic response (CMR) with no perceptible lesion; partial metabolic response (PMR), stable metabolic disease (SMD), or progressive metabolic disease (PMD) using the threshold of 30% and 0.8 unit change in SULpeak; and unequivocal new lesion meant PMD. The concordance for response categorization was assessed by kappa statistics.
Results
A total of 40 patients (25 non-small cell lung cancer; 15 small cell lung cancer) were analyzed, all with 18F-FDG-avid lung cancer. Average of 3 target lesions were measured for up-to-5 lesion analysis. Pearson’s r was 0.74 (P < 0.001) and increased to 0.96 (P < 0.001) when two outliers were excluded. Response categorization with 1 lesion and up-to-5 lesion analyses was concordant in 37 patients (92.5%, weighted kappa = 0.89).
Conclusion
Analyzing 1 lesion and up-to-5 lesions for response assessment by PERCIST showed high concordance in patients with lung cancer.
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Acknowledgements
This article is the expansion of a previous abstract presented at the SNMMI 2020 annual meeting (https://jnm.snmjournals.org/content/61/supplement_1/1357).
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Soo Jin Kwon, Joo Hyun O, and Ie Ryung Yoo declare no conflict of interest.
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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 Helsinki declaration as revised in 2013 and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.
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The institutional review board of our institute approved this retrospective study (KC20RASI0078), and the requirement to obtain informed consent was waved.
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Kwon, S.J., O, J.H. & Yoo, I.R. One Versus Up-to-5 Lesion Measurements for Response Assessment by PERCIST in Patients with Lung Cancer. Nucl Med Mol Imaging 55, 123–129 (2021). https://doi.org/10.1007/s13139-021-00697-4
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DOI: https://doi.org/10.1007/s13139-021-00697-4