Lymph Node Ratio Predicts Recurrence and Survival for Patients with Resectable Stage 4 Hypopharyngeal Cancer
Wu-Chia Lo1,2, Chen-Tu Wu1,3, Cheng-Ping Wang1,4
1Department and Graduate Institute of Pathology, National Taiwan University College of Medicine, Taipei, 100, Taiwan.
Background:
This study aimed to investigate the clinicopathologic prognostic predictors of stage 4 hypopharyngeal cancer and to extend the traditional tumor-node-metastasis classification system to advance its predictive ability.
Methods:
The study enrolled 120 patients with pathologically stage 4 hypopharyngeal cancer treated with pharyngolaryngectomy and neck dissection between 2001 and 2007.
Results:
The study showed a 5-year overall survival (OS) of 44.6%, a disease-specific survival (DSS) of 51.6%, and a disease-free survival (DFS) of 48% for all the patients. In the multivariate analysis, a lymph node (LN) ratio of 0.113 or higher was a significant poor prognostic factor for OS (hazard ratio [HR] 1.89; 95% confidence interval [CI] 1.17-3.05; p = 0.009), DSS (HR 2.17; 95% CI 1.29-3.64; p = 0.003), and DFS (HR, 2.24; 95% CI 1.12-4.52; p = 0.024) in stage 4 hypopharyngeal cancer. In addition, pretreatment neutrophil-lymphocyte ratio, lymphovascular invasion, and margin status also were predictors of survival outcomes. Furthermore, the study found that disease recurrence differed significantly between the patients with a LN ratio of 0.113 or higher (68.2%) and those with a LN ratio lower than 0.113 (39.5%) (p = 0.002).
Conclusions:
A LN ratio of 0.113 or higher is a strong predictor of disease recurrence and survival for patients with stage 4 hypopharyngeal cancer.
