Utilization of the lymph node-to-primary tumor ratio of PET standardized uptake value and circulating Epstein–Barr virus DNA to predict distant metastasis in nasopharyngeal carcinoma

Eric Yi Liang Shen, Tsung Min Hung, Din Li Tsan, Nai Ming Cheng, Chung Jan Kang, Shiang Fu Huang, Cheng Lung Hsu, Chien Yu Lin, Hung Ming Wang, Jason Chia Hsun Hsieh, Ann Joy Cheng, Kang Hsing Fan*, Joseph Tung Chieh Chang

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

7 Scopus citations

Abstract

Background and purpose: To determine the clinical impact of integrating Epstein–Barr virus (EBV) DNA and lymph node-to-primary tumor ratio (NTR) of positron emission tomography (PET) standardized uptake value (SUV) in predicting distant metastasis, such as distant metastasis-free survival (DMFS), in patients with nasopharyngeal carcinoma (NPC). Materials and methods: We retrospectively reviewed patients diagnosed with non-disseminated NPC between 2010 and 2017. The optimal cut-off values of EBV DNA and SUV NTR were determined using receiver operating characteristic analysis. The prognostic values of SUV NTR and EBV DNA on DMFS and overall survival were evaluated using the Kaplan–Meier method. Univariate and multivariable analyses were performed using the Wald Chi-squared test and Cox proportional hazards regression, respectively. Results: A total of 488 patients were included in the analysis. The median follow-up period was 61.6 months. The optimal cut-off values of EBV DNA and SUV NTR were 3377.5 copies per mL and 0.64, respectively. The five-year DMFS for patients with high vs low EBV DNA and SUV NTR levels were 64.9% vs 86.6% (p < 0.001) and 78.7% vs 87.4% (p = 0.021), respectively. In subgroup analysis, the high-risk group with high levels of pretreatment EBV DNA and SUV NTR had worse DMFS in either American Joint Committee on Cancer (AJCC) stage I–III or IVA–B (p = 0.001 and <0.001, respectively). Univariate and multivariable analyses showed the statistical significance of EBV DNA, SUV NTR, and their composite in DMFS (p < 0.001 for EBV DNA; p = 0.022 for SUV NTR; p < 0.001 for their composite). Conclusion: This study showed that EBV DNA and SUV NTR have independent and additive values as prognosticators for distant metastasis in patients with NPC, suggesting that these two individual factors, except the AJCC staging system, should be included in future studies.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalRadiotherapy and Oncology
Volume177
DOIs
StatePublished - 12 2022

Bibliographical note

Publisher Copyright:
© 2022

Keywords

  • Distant metastasis-free survival
  • Epstein–Barr virus DNA
  • Lymph node-to-primary tumor ratio
  • Nasopharyngeal carcinoma
  • Positron emission tomography
  • Standardized uptake value

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