Lymph node ratio as an independent prognostic factor in oral squamous cell carcinoma
Ardalan Ebrahimi1, Jonathan R Clark, Wan Jing Zhang
1Sydney Head and Neck Cancer Institute and The Sydney Cancer Centre, Royal Prince Alfred Hospital, Sydney, Australia. ardalan100@hotmail.com
Background:
We aimed to validate the lymph node ratio (LNR) as an independent prognostic factor in oral squamous cell carcinoma (OSCC) and compare its utility with the current nodal staging system.
Methods:
We conducted a retrospective analysis of 313 patients with OSCC undergoing neck dissection. The LNR was adjusted by relevant covariates in a multivariable Cox regression model.
Results:
LNR displaced conventional nodal staging and was shown to be an independent predictor of regional failure (p = .020), disease-specific (p = .003) and overall survival (p = .001). Patients with an LNR of 2.5% to 7.5%, 7.5% to 20%, and >20% had 2.6, 3.7, and 4.4 times the risk of death from OSCC, respectively, when compared with patients with an LNR <2.5%.
Conclusions:
The LNR is an independent prognostic factor in OSCC and may be used in conjunction with the current TNM staging to enable better risk stratification and selection for adjuvant therapy.