Abstract
Background
Extranodal extension (ENE) is a poor prognostic indicator for patients with head and neck squamous cell carcinoma (HNSCC), but pretreatment detection assists with proper treatment planning. This study evaluated whether the ENE of HNSCC is accurately detected by computed tomography (CT) versus fluorine 18-fluorodeoxyglucose (18F-FDG) positron emission tomography (PET)/CT and whether it has any impact on patient prognosis.
Methods
In this study, 186 HNSCC patients were preoperatively evaluated using contrast-enhanced CT and 18F-FDG PET/CT. The histopathologic findings for the neck dissection samples served as a standard reference. McNemar’s test and logistic regression using the generalized estimating equations were used to compare the diagnostic value of CT versus 18F-FDG PET/CT, and Cox proportional hazard regression was used to assess the prognostic value of ENE.
Results
Among the 186 study patients, 113 (60.8 %) had a neck metastasis, 44 (23.7 %) had pathologic ENE, and 37 (19.9 %) had macroscopic ENE. Radiologic ENE (rENE) on CT was documented for 48 patients (25.8 %) and 52 neck sides (19.8 %). Using 4.9 as the cutoff value for nodal maximum standardized uptake, 18F-FDG PET/CT documented rENE for 44 patients (23.7 %) and 48 neck sides (18.3 %). Compared with 18F-FDG PET/CT, CT detected ENE, with a specificity of 92.1 versus 74.4 % (p < 0.001) and an accuracy of 88.6 versus 75.3 % (p < 0.001). However, rENE was not a significant predictor of recurrence or survival (p > 0.05).
Conclusion
The findings showed that ENE of HNSCC is more accurately detected by using CT than by using 18F-FDG PET/CT. The accurate pretreatment detection of ENE may help in the planning for HNSCC treatments.
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Acknowledgments
This study was supported by a Grant (No. 2014-0306) from the Asan Institute for Life Science and a Grant (No. HI14C23050000) from the Korean Health Technology R&D Project, Ministry of Health & Welfare, Seoul, Republic of Korea (J.-L. Roh).
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Jae Ryung Lee and Young Jun Choi have equally contributed to this paper.
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Supplementary Figure S1
Receiver operating curve analysis to determine the cutoff value for the nodal maximum standardized uptake value (SUVmax) for detecting extranodal extension before administering 18F-FDG PET/CT. Supplementary material 1 (TIFF 1183 kb)
Supplementary Table S1
Relationship between CT Findings and Neck Histopathology Results of ENE. Supplementary material 2 (DOC 39 kb)
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Lee, J.R., Choi, Y.J., Roh, JL. et al. Preoperative Contrast-Enhanced CT Versus 18F-FDG PET/CT Evaluation and the Prognostic Value of Extranodal Extension for Surgical Patients with Head and Neck Squamous Cell Carcinoma. Ann Surg Oncol 22 (Suppl 3), 1020–1027 (2015). https://doi.org/10.1245/s10434-015-4689-7
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DOI: https://doi.org/10.1245/s10434-015-4689-7