Abstract
Purpose
Metastatic lymph node (LN) burden is one of the most important prognosticators in human solid cancers, but has rarely been examined in laryngeal and hypopharyngeal cancers (LHC). We evaluated the nodal factors predictive of recurrence and survival in patients with LHC.
Methods
This study included 141 consecutive patients who underwent primary surgery and neck dissection for previously untreated LHC at our tertiary referral centre. Nodal factors included the presence of pathological LN metastasis, number of positive LNs, LN ratio, and extra-nodal extension (ENE). Our proposed N classification was analysed by recursive partitioning analysis and compared with the AJCC and other N classifications using the c-index. Univariate and multivariate Cox proportional hazard regression analyses were used to define significant predictors of post-treatment disease-free survival (DFS) and overall survival (OS).
Results
Of the 141 patients, 66 (46.8%) had positive LNs, and 27 (19.1%) had ENE. In multivariate analyses, the number of positive LNs was strongly associated with DFS and OS outcomes (P < 0.01). Our new N classification was proposed with four categories, such as N0 (0 LN +), N1 (1 LN +), N2 (2–4 LN + or ENE) and N3 (≥ 5 LN +). The C-index of our new N classification improved the OS prediction (0.718) compared with the AJCC and the other N classifications (0.704–0.713).
Conclusion
Metastatic LN burden is an important predictor of survival in patients with LHC. A proposed N classification using the number of positive LNs and ENE might improve the LHC survival prediction.
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Funding
This study was supported by the National Research Foundation of Korea (NRF) grant, funded by the Ministry of Science and ICT (MSIT), the Government of Korea (no. 2019R1A2C2002259) (J.-L.R.).
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research board and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the authors. Informed consent from all individual participants was waived because of the retrospective nature of this study.
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432_2019_2990_MOESM1_ESM.tif
Kaplan–Meier curves estimating overall survival according to the proposed nodal staging system and primary tumour locations of the larynx (A) and hypopharynx (B). Log-rank test, P < 0.05. ENE, extra-nodal extension; LN, lymph node (TIFF 2433 kb)
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Choi, Y., Bin-Manie, M., Roh, JL. et al. Metastatic lymph node burden predictive of survival in patients undergoing primary surgery for laryngeal and hypopharyngeal cancer. J Cancer Res Clin Oncol 145, 2565–2572 (2019). https://doi.org/10.1007/s00432-019-02990-4
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DOI: https://doi.org/10.1007/s00432-019-02990-4