RESUMO
Lymph node status is an important prognostic factor in head and neck cancer. The purpose of this study is to investigate the prognostic value of lymph node density (LND) in node-positive oral cavity cancer patients who received surgery plus adjuvant radiotherapy. From January 2008 to December 2013, a total of 61 oral cavity squamous cell cancer patients who had positive lymph node and received surgery and adjuvant radiotherapy were analysed. LND was calculated for each patient. The endpoints were 5-year overall survival (OS) and 5-year disease-free survival. All patients were followed for a period of 5 years. Mean 5-year overall survival for cases with LND of ≤ 0.05 was 56.1 ± 11.6 months, whereas mean 5-year overall survival for cases with LND > 0.05 was 40.0 ± 21.6 months. Log rank is 0.04 95% CI = 53.4-65. Mean 5-year disease-free survival for cases with LND of ≤ 0.05 was 50.5 ± 15.8 months, whereas mean disease-free survival for cases with LND > 0.05 was 15.8 ± 22.9 months. Log rank 0.03 95% CI = 43.3-57.6. Nodal status, disease stage and lymph node density were found to be significant predictors of prognosis in univariate analysis. In multivariate analysis, only lymph node density is found to be the predictor of prognosis. LND is an important prognosis factor for 5-year OS and 5-year DFS in oral cavity squamous cell carcinoma.