Abstract | BACKGROUND: Little is known about the nature of metastasis to small cervical lymph nodes (SCLNs) in the patients with nasopharyngeal carcinoma (NPC) examined by using 18-fluoro-2-deoxy-glucose (18F-FDG) positron emission tomography/computed tomography (PET/CT). The present study aimed to evaluate the diagnostic values of PET/CT in identifying metastasis in SCLNs in NPC patients. METHODS: Magnetic resonance images (MRI) and PET/CT scans for 470 patients with newly diagnosed, non-distant metastatic NPC were analyzed. Metastatic rates of SCLNs were defined by the positive number of SCLNs on PET/CT scans and total number of SCLNs on MRI scans. Receiver operating characteristic curve was applied to compare PET/CT-determined stage with MRI-determined stage. RESULTS: In total, 2082 SCLNs were identified, with 808 (38.8%) ≥ 5 and < 6 mm in diameter (group A), 526 (25.3%) ≥ 6 and < 7 mm in diameter (group B), 374 (18.0%) ≥ 7 and < 8 mm in diameter (group C), 237 (11.4%) ≥ 8 and < 9 mm in diameter (group D), and 137 (6.5%) ≥ 9 and < 10 mm in diameter (group E). The overall metastatic rates examined by using PET/CT for groups A, B, C, D, and E were 3.5%, 8.0%, 31.3%, 60.0%, and 83.9%, respectively (P < 0.001). In level IV/Vb, the metastatic rate for nodes ≥ 8 mm was 84.6%. PET/CT examination resulted in modification of N category and overall stage for 135 (28.7%) and 46 (9.8%) patients, respectively. The areas under curve of MRI-determined and PET/CT-determined overall stage were 0.659 and 0.704 for predicting overall survival, 0.661 and 0.711 for predicting distant metastasis-free survival, and 0.636 and 0.663 for predicting disease-free survival. CONCLUSIONS: PET/CT was more effective than MRI in identifying metastatic SCLNs, and the radiologic diagnostic criteria for metastatic lymph nodes in level IV/Vb should be re-defined.
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Authors | Hao Peng, Lei Chen, Ling-Long Tang, Wen-Fei Li, Yan-Ping Mao, Rui Guo, Yuan Zhang, Li-Zhi Liu, Li Tian, Xu Zhang, Xiao-Ping Lin, Ying Guo, Ying Sun, Jun Ma |
Journal | Chinese journal of cancer
(Chin J Cancer)
Vol. 36
Issue 1
Pg. 95
(Dec 19 2017)
ISSN: 1944-446X [Electronic] England |
PMID | 29258597
(Publication Type: Journal Article)
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Chemical References |
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Topics |
- Adolescent
- Adult
- Aged
- Carcinoma
(diagnosis, mortality, radiotherapy)
- Female
- Fluorodeoxyglucose F18
- Humans
- Lymph Nodes
(diagnostic imaging, pathology)
- Lymphatic Metastasis
- Magnetic Resonance Imaging
- Male
- Middle Aged
- Nasopharyngeal Carcinoma
- Nasopharyngeal Neoplasms
(diagnosis, mortality, radiotherapy)
- Neck
(diagnostic imaging, pathology)
- Neoplasm Staging
- Positron Emission Tomography Computed Tomography
(methods)
- Prognosis
- ROC Curve
- Radiotherapy, Intensity-Modulated
- Treatment Outcome
- Young Adult
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