Clinical significance of post-treatment 18F-fluorodeoxyglucose uptake in cervical lymph nodes in patients with diffuse large B-cell lymphoma
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Abstract
Objectives
We assessed the clinical significance of FDG uptake in cervical lymph nodes after treatment of patients with DLBCL.
Methods
In total, 87 patients with DLBCL were enrolled. All patients had newly appeared FDG uptake in cervical lymph nodes on PET/CT during follow-up after cessation of therapy. Cervical lymph nodes were finally diagnosed as benign or malignant according to histopathological findings or follow-up PET. Clinical characteristics and PET findings were compared between groups and factors associated with malignant lesions were evaluated.
Results
Only 8 (9.2 %) patients with cervical lymph nodes with FDG uptake ultimately had malignancy. FDG uptake lymph nodes appeared significantly earlier in the malignant group than in patients with benign FDG uptake (p = 0.013). Primary nodal lymphoma was more frequent in patients with cancer spread than in those with benign FDG uptake in lymph nodes (p < 0.001).
Conclusion
Most cervical lymph nodes with FDG uptake (about 91 %) appearing after treatment of malignant DLBCL were ultimately benign. The elapsed time between the end of therapy and the appearance of cervical lymph nodes with FDG uptake and the primary sites of lymphomas are helpful clues in determining which cases are malignant.
Key Points
• About 91 % appearing after treatment of DLBCL were benign.
• Elapsed time between therapy and FDG uptake was associated with malignancy.
• Primary sites of lymphoma are helpful clues to determine malignancy.
Keywords
Cervical lymph node Positron emission tomography F-18 fluorodeoxyglucose Diffuse large B-cell lymphoma MalignancyAbbreviations
- FDG
18F-fluorodeoxyglucose
- DLBCL
Diffuse large B-cell lymphoma
- PET
Positron emission tomography
- IQR
Interquartile range
- R-CHOP
Cyclophosphamide, doxorubicin, vincristine, prednisone, rituximab
- LDH
Lactate dehydrogenase
- ECOG
Eastern Cooperative Oncology Group
- IPI
International Prognostic Index
- SUVmax
Maximum standardized uptake value
- OR
Odds ratio
- CI
Confidence interval
Notes
Acknowledgments
The scientific guarantor of this publication is Young-Sil An. The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article. The authors state that this work has not received any funding. No complex statistical methods were necessary for this paper. Institutional review board approval was obtained. Written informed consent was waived by the institutional review board. Methodology: retrospective, observational, performed at one institution. The design of this retrospective study was approved by the institutional review board of Ajou University (MED-MDB-15-220).
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