Abstract
Purpose
18F-fluorodeoxyglucose (FDG) positron emission tomography/computed tomography (PET/CT) is the standard imaging modality for response evaluation in FDG-avid lymphoma, but the prognostic value is not established in follicular lymphoma (FL). This study investigated the prognostic value of Deauville 5-point scale (D5PS) from paired interim PET/CT (PETInterim) and end-of-induction therapy PET/CT (PETEOI) in patients with FL.
Methods
FL staging and response assessment PET/CT images from 2013 to 2015 were retrospectively reviewed. PETInterim was performed 3 or 4 cycles after chemotherapy and PETEOI after 6 or 8 cycles. D5PS scores of 1, 2, and 3 were considered as negative (−), and scores 4 and 5 were considered as positive (+). Statistical analysis was done using Cox regression analysis, Kaplan–Meier survival analysis, and the log-rank test.
Results
Thirty-three patients with set of baseline, interim, and end-of-induction therapy PET/CT studies were included. Ten patients (30.3%) had progression. The median progression-free survival (PFS) was 38.8 months (range 3.5–72.7 months). On PETInterim, 23 patients were negative and 10 were positive. On PETEOI scans, 29 patients were negative, and 4 were positive. On multivariate analysis, PETEOI(−) was associated with longer PFS. PETInterim(+) and PETEOI(+) patients had a significantly shorter PFS than PETInterim(−) patients (39.9 months, 95% confidence interval [CI] 23.0–56.9, versus 55.5 months, 95% CI 49.7–61.2, p = 0.005) and PETEOI(−) patients (14.2 months, 95% CI 8.5–19.8, versus 60.5 months, 95% CI 52.1–69.0, p < 0.001).
Conclusion
For patients with FL, PETInterim and PETEOI response is predictive of PFS, and PETEOI(+) is an independent prognostic factor for progression of FL.
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The authors thank Martin Mawhinney for his assistance in data acquisition.
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Sun Ha Boo, Joo Hyun O, Soo Jin Kwon, Ie Ryung Yoo, Sung Hoon Kim, Gyeongsin Park, Byung Ock Choi, Seung Eun Jung, Seok-Goo Cho declare that they have no conflict of interest. There is no source of funding.
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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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The Institutional Review Board of our institute approved this retrospective study, and the requirement to obtain informed consent was waived.
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Boo, S.H., O, J.H., Kwon, S.J. et al. Predictive Value of Interim and End-of-Therapy 18F-FDG PET/CT in Patients with Follicular Lymphoma. Nucl Med Mol Imaging 53, 263–269 (2019). https://doi.org/10.1007/s13139-019-00602-0
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DOI: https://doi.org/10.1007/s13139-019-00602-0