Recategorization of tumor stage in patients with node-negative oral tongue cancer: Impact of the eighth edition American Joint Committee staging system.

Abstract

To evaluate recategorization of pT1-3N0 oral tongue cancer, from seventh to eighth editions of the American Joint Committee on Cancer (AJCC) staging classification, and impact on overall survival (OS). Using the National Cancer Database, 1277 patients were categorized using tumor size and depth of invasion with seventh and eighth AJCC staging systems and evaluated for OS. Tumor-category was unchanged in 82.9% and upstaged in 17.1% patients with eighth AJCC. The 3-year OS was 85.3%, 76.6%, and 77.0% with seventh AJCC compared to 87.1%, 75.1%, and 81% with eighth AJCC, for patients with pT1N0, pT2N0, and pT3N0 disease, respectively. Improved discrimination of pT1N0 vs pT2N0 for OS on multivariate analysis was seen for eighth AJCC (hazard ratio [HR] = 1.43, 95% confidence interval [CI]: 1.03-1.98, P = .03) but not for patients with pT3N0, with seventh AJCC (HR = 1.02, 95% CI:0.53-1.98, P = .95), and eighth AJCC (HR = 0.86, 95% CI: 0.52-1.42, P = .55). Eighth edition AJCC staging leads to improved discrimination of OS between pT1N0 and pT2N0 but not for patients with pT3N0.